Polymerization initiating system and method to produce highly reactive olefin functional polymers

0001The invention is directed to a method for producing highly reactive olefin polymers wherein at least 50 mol. % of the polymer chains have terminal double bonds, and a novel polymerization initiating system for accomplishing same.

BACKGROUND OF THE INVENTION

0002The carbocationic polymerization of isobutylene (IB) is the subject of great scientific and industrial interest. The unique properties of polyisobutylene (PIB), a chemically stable fully saturated polymer make it a desirable material with applications ranging from medical devices to ashless (metal-free) dispersants/detergents suitable for use as motor oil and fuel additives. These ashless dispersants/detergents can be characterized as oil soluble surfactants with oligoamine end-groups derived from low molecular weight (number average molecular weight (<o ostyle="single">M</o>_n) of from about 500 to about 5000) PIB or polybutenes (copolymers of IB with C₄ olefins) having olefinic end groups.

0003Two major industrial methods have been developed to produce low molecular weight IB homo or copolymers with olefinic end groups. The "conventional" method uses a C₄ mixture and an aluminum halide based catalyst system and produces polybutenes with high tri-substituted olefinic contents. Due to the low reactivity of the tri-substituted olefinic end groups, polybutenes need to be chlorinated to react with maleic anhydride to give polybutenylsuccinic anhydride, which is subsequently reacted with oligoalkylenimines to yield polybutenylsuccinimide-type ashless dispersant/detergent. The other method employs a pure IB feed stream and a BF₃ complex-based catalyst with either alcohols, or ethers in a polymerization reaction run at low temperature, which yields highly reactive PIB (HR PIB) with high exo-olefinic end-group contents. In contrast to the tri-substituted olefins of conventional polybutenes, PIB exo-olefins readily react with maleic anhydride in a thermal "ene" reaction to produce PIB succinic anhydride and subsequently polyisobutenylsuccinimide ashless dispersants. Because the final product does not contain chlorine, HR PIB is more desirable than conventional polybutenes. However, BF₃ is difficult to handle and the polymer may contain fluorine. Further, as noted above, this method requires a pure IB feed steam and low temperature (e.g., -30°C) and therefore results in a more expensive product.

0004The above-described commercial process for producing HR PIB has been reported by <patcit id="pcit0001" dnum="US5408018A"><text>US Pat. No. 5,408,018</text></patcit> (and <patcit id="pcit0002" dnum="DE2702604A"><text>DE-A 2702604</text></patcit>) to Rath. A range of process enhancements were subsequently reported in. <patcit id="pcit0003" dnum="US6407186B"><text>US Pat. Nos. 6,407,186</text></patcit>, <patcit id="pcit0004" dnum="US6753389B"><text>6,753,389</text></patcit>, and <patcit id="pcit0005" dnum="US7217773B"><text>7,217,773 to Rath et al.</text></patcit> and <patcit id="pcit0006" dnum="US6846903B"><text>US Pat. Nos. 6,846,903</text></patcit>, <patcit id="pcit0007" dnum="US6939943B"><text>6,939,943</text></patcit> and <patcit id="pcit0008" dnum="US7038008B"><text>7,038,008 to Wettling et al</text></patcit>. A modified process using a different temperature regime and a low residence time was also previously described (e.g., <patcit id="pcit0009" dnum="US6562913B"><text>US Pat. Nos. 6,562,913</text></patcit> and <patcit id="pcit0010" dnum="US6683138B"><text>6,683,138 to Baxter et al.</text></patcit>). All of these disclosures describe polymerizations carried out with BF₃ catalyst and an alcohol or ether co-catalyst. Such catalytic processes can leave residual fluorine in the polymer especially when utilized with the commonly available mixed C₄ Raffinate I stream. The presence of even small amounts of fluorine cause problems in downstream functionalization reactors due to the release of HF and therefore require expensive fluorine removal post-treatment.

0005Many attempts have therefore been made to find other methods for producing HR PIB. For instance PIB with nearly quantitative exo-olefin endgroup has been obtained by reacting <i>tert</i>-chloride-terminated PIB (PIB-Cl) with strong bases such as potassium <i>tert</i>-butoxide and alkali ethoxides in refluxing tetrahydrofuran (THF) for 20-24 h, (<nplcit id="ncit0001" npl-type="s"><text>Kennedy, J.P.; Chang, V.S.C.; Smith, R.A.; Iván, B. Polym. Bull. 1979, 1, 575</text></nplcit>); quenching living PIB with methallyltrimethylsilane, (<nplcit id="ncit0002" npl-type="s"><text>Nielsen, L.V.; Nielson, R.R.; Gao, B.; Kops, J.; Iván, B. Polymer 1997, 38, 2528</text></nplcit>.); quenching living PIB with a hindered base (e.g., 2,5-dimethylpyrrole or 1,2,2,6,6-pentamethylpiperidine), (<nplcit id="ncit0003" npl-type="s"><text>Simison, K.L.; Stokes, C.D.; Harrison, J.J.; Storey, R.F. Macromolecules 2006, 39, 2481</text></nplcit>); quenching living PIB with an alkoxysilane or an ether compound (<patcit id="pcit0011" dnum="US20090318624A1" dnum-type="L"><text>Storey, R.F.; Kemp, L.L. U.S. Patent Application Publication, 2009/0318624 A1, Dec. 24, 2009</text></patcit>);and reacting living PIB with a mono-sulfide followed by decomposition of the resulting sulfonium salt with a base (<nplcit id="ncit0004" npl-type="s"><text>Morgan. D.L.; Stokes, C.D.; Meierhoefer, M.A.; Storey, R.F. Macromolecules 2009, 42, 2344</text></nplcit>). However, all of the above methods are expensive as they involve living cationic polymerization at low temperature in a moderately polar solvent and employ expensive reactants.

0006A broad disclosure of halogen-free metal catalysts based on oxides of Groups V and VI of the Periodic Table of Elements was described in <patcit id="pcit0012" dnum="US6441110B"><text>US Pat. No. 6,441,110 to Sigwart et al.</text></patcit>, but these catalysts were heterogenous and gave poor monomer conversions, with only modest amounts of exo-olefins. Another catalyst system, based on metals from the 3^rd to the 12^th periods of the periodic system of elements with nitrile ligands and weakly coordinating anions was described in <patcit id="pcit0013" dnum="US7291758B"><text>US Pat. No. 7,291,758 to Bohnepoll et al.</text></patcit> These catalysts were used only in a polar dichloromethane solution; not in an apolar, all-hydrocarbon media.

0007More recently it has been reported that AlCl₃-OBu₂ complexes in conjunction with a range of initiators or adventitious water initiate the polymerization of IB and in polar solvent (CH₂Cl₂/hexane 80/20 v/v) yield PIB with high exo-olefinic end groups up to 95% in a range of temperatures (-60 to -20 °C) (<nplcit id="ncit0005" npl-type="s"><text>Vasilenko, I.V.; Frolov, A.N.; Kostjuk, S.V. Macromolecules 2010, 43(13), 5503-5507</text></nplcit>). Independently, similar results were reported with adventitious water as initiator in conjunction with AlCl₃ or FeCl₃ dialkyl ether complexes in CH₂Cl₂ at temperatures ranging from -20 to 20°C (<nplcit id="ncit0006" npl-type="s"><text>Lui, Q.; Wu Y.; Zhang, Y.; Yan. P.F.; Xu, R.W. Polymers 2010, 51, 5960-5969</text></nplcit>). However, due to the need for the polar solvent CH₂Cl₂ the commercial potential of this method is questionable. AlCl₃-OBu₂ has been reported to produce PIB with terminal vinylidene bonds in the absence of solvent and without added initiator, or with water as an added initiator (<patcit id="pcit0014" dnum="USPG20110201772A1"><text>USPG 2011/0201772A1 of K nig et al.</text></patcit>). However, none of the conventional cationic initiators such as alkyl halides, ethers, esters, alcohols and Brønsted acids were found to initiate directly the polymerization in apolar media with AlCl₃. Therefore there remains a need for a robust and economic method for the preparation of highly reactive PIB or polybutene in a non-polar hydrocarbon media.

SUMMARY OF THE INVENTION

0008It has now been found that conventional cationic initiators used in conjunction with certain combinations of Lewis acid/Lewis base complexes initiate the polymerization of IB in hydrocarbon solvents at temperatures of - 30°C to +50°C and provide high yields of highly reactive PIB.

0009The catalyst of the catalyst-initiator system of the present invention comprises a Lewis acid catalyst (MR"Y_n) complexed to a Lewis base (B) in an apolar medium. The affinity of the Lewis acid for the Lewis base should be such that the Lewis acid can interact at least partially with a conventional cationic initiator (RX) enabling the formation of R⁺, which initiates cationic polymerization of isobutylene. The initially complexed Lewis base should be capable of effecting rapid deprotonation of the growing carbocation chain to form an exo-olefin prior to isomerization of the cationic chain or diffusion of the base into free solution. If the Lewis base does not complex to the Lewis acid, at least initially, deprotonation of the growing carbocation will not be sufficiently rapid relative to isomerization to give the desired high yields of exo-olefin. If the interaction of the Lewis acid and the Lewis base is so strong that it prevents interaction with a conventional initiator, polymerization will be inefficient or not occur at all. The Lewis acid or Lewis acid-Lewis base complex must further be capable of interacting with a conventional initiator either in the presence or absence of adventitious water. Catalysts with which monomer conversion is substantially dependent on adventitious water, even in the presence conventional initiators, as evidenced by complete loss of conversion in the presence of a proton trap (e.g., 2, 6-ditert-butylpyridine or "DTBP"), are not suitable.

DETAILED DESCRIPTION OF THE INVENTION

0010Lewis acid catalysts useful in the practice of the present invention can be represented by the general formula (MR"_mY_n), wherein M is selected from Fe, Ga, Hf, Zr and W; preferably Ga or Fe, more preferably Ga; R" is a hydrocarbyl group, preferably a C₁ to C₈ hydrocarbyl group, more preferably a C₁ to C₈ alkyl group; m is 0 or an integer of 1 to 5, preferably 0 or 1, more preferably 0; Y is halogen (F, Cl, Br), preferably either Cl or Br, more preferably Cl, and n is an integer of 1 to 6, preferably 3 to 5; with the proviso that m+n is equal to the valency of M. As used herein, the term "hydrocarbyl" means a chemical group of a compound that contains hydrogen and carbon atoms and that is bonded to the remainder of the compound directly via a carbon atom. The group may contain one or more atoms other than carbon and hydrogen ("hetero atoms") provided they do not affect the essentially hydrocarbyl nature of the group.

0011The Lewis base (B) is selected from oxygen- and/or sulfur-containing nucleophiles, such as ethers, alcohols, ketones, aldehydes and esters, and sulfur-containing nucleophiles such as thioethers and thioketones. Specific examples of suitable Lewis bases include acyclic dihydrocarbyl ethers, wherein each hydrocarbyl group is independently selected from C₁ to C₁₂ hydrocarbyl, cyclic ethers having a 5 to 7 membered cyclic group, dihydrocarbyl ketones, wherein each hydrocarbyl group is independently selected from C₁ to C₁₂ hydrocarbyl, C₁ to C₁₂ aliphatic alcohols, C₁ to C₁₂ aliphatic aldehydes, acyclic aliphatic esters wherein each hydrocarbyl group is independently selected from C₁ to C₁₂ hydrocarbyl, cyclic aliphatic esters having a 5 to 7 membered cyclic group, dihydrocarbyl sulfides, wherein each hydrocarbyl group is independently selected from C₁ to C₁₂ hydrocarbyl and dihydrocarbyl thiocarbonyl compounds, wherein each hydrocarbyl group is independently selected from C₁ to C₁₂ hydrocarbyl. The hydrocarbyl groups of the above Lewis bases are preferably alkyl groups and are more preferably C₁ to C₄ alkyl. The hydrocarbyl groups and cyclic aliphatic groups of the above Lewis bases may each independently be substituted with a heteroatom or a heteroatom-containing moiety and may further be substituted with other substituent groups that do not interfere significantly with the ability of such compounds to function as a Lewis base (e.g., C₁ to C₄ "lower alkyl" groups).

0012An "initiator" is defined as a compound that can initiate polymerization, in the presence or absence of adventitious water and in the presence of a proton trap. The initiator of the present invention (RX) comprises a hydrocarbyl R group wherein the carbon linking group R to X is tertiary, benzylic or allylic, which hydrocarbyl group can form a stable carbocation (e.g., t-butyl⁺), and an X group, which is a halogen.

0013The polymerization medium must be a substantially or completely apolar medium, such as a mixture of hexanes or saturated and unsaturated C₄ hydrocarbons.

0014In the polymerization process of the present invention, the feedstock may be pure isobutylene or a mixed C₄ hydrocarbyl feedstock containing isobutylene, such as a C₄ cut resulting from the thermal or catalytic cracking operation of, for example, naphtha. Thus, suitable feedstocks will typically contain at least 10%, and up to 100% isobutylene, by mass, based on the total mass of the feed. In addition to isobutylene, conventional C₄ cuts suitable for use as feedstocks that are of industrial importance typically will contain between 5% and 50% butene-1, between 2% and 40% butene-2, between 2% and 60% iso-butane, between 2% and 20% n-butane, and up to 0.5% butadiene, all percentages being by mass, based on the total feed mass. Feedstocks containing isobutylene may also contain other non-C₄ polymerizable olefin monomers in minor amounts, e.g., typically less than 25%, preferably less than 10%, and most preferably less than 5%, such as propadiene, propylene and C₅ olefins. The C₄ cut may be purified by conventional means to remove water, polar impurities and dienes.

0015The term "polybutene", as employed herein is intended to include not only homopolymers of isobutylene, but also copolymers of isobutylene and one or more other C₄ polymerizable monomers of conventional C₄ cuts as well as non-C₄ ethylenically unsaturated olefin monomers containing 5 carbon atoms, provided such copolymers contain typically at least 50%, preferably at least 65%, and most preferably at least 80% isobutylene units, by mass, based on the polymer number average molecular weight (<o ostyle="single">M</o>_n).

0016The Lewis acid and Lewis base can be complexed by, for example, dissolving the Lewis acid in a solvent (e.g., dichloromethane or 1, 2-dichloroethane) to form a solution and then adding the Lewis base to the solution, while the solution is stirred. The complex may be added to the polymerization medium with the solvent; alternatively, the solvent may be removed prior to the addition of the complex to the polymerization medium.

0017The molar ratio of Lewis acid to Lewis base in the complex will typically be maintained within a range of from 1:0.5 to 1:2, preferably from 1:0.7 to 1:1.5, more preferably from 1:0.8 to 1:1.2, such as from 1:0.9 to 1:1.1 or 1:1.

0018The amount of the Lewis acid-Lewis base complex employed in the process of the present invention can be controlled, in conjunction with the concentration of initiator and monomer, reaction time and temperature, to achieve the target <o ostyle="single">M</o>_n of the polybutene polymer product, the conversion of butene and yield of polybutene. In view of the above, the Lewis acid-Lewis base complex is typically employed in an amount sufficient to contact the butene monomer in a liquid phase reaction mixture at a concentration of millimoles of Lewis acid-Lewis base complex per liter of reaction mixture of from 1 mM to 200 mM, preferably from 5 mM to 100 mM, and more preferably from 10 mM to 50 mM, such as from 10 mM to 30 mM.

0019The initiator will typically be employed in an amount sufficient to contact the butene monomer in a liquid phase reaction mixture at a concentration of millimoles of initiator per liter of medium, and independent from the amount of Lewis acid-Lewis base complex, of from 1mM to 200 mM, preferably from 5 mM to 100 mM, and more preferably from 10 mM to 50 mM, such as from 10 mM to 30 mM.

0020The polymerization reaction can be conducted batch-wise, semi-continuously, or continuously. On an industrial scale, the polymerization reaction is preferably conducted continuously. Conventional reactors, such as tubular reactors, tube-bundle reactors or loop reactors, ie, tube or tube-bundle reactors with continuous circulation of the reaction material, may be used.

0021The polymerization reaction is conducted in the liquid phase to induce linear or chain-type polymerization, as opposed to ring or branch formation. Thus, if a feed is used that is gaseous under ambient temperature, it is preferred to control the reaction pressure and/or dissolve the feed in an inert solvent or liquid diluent, in order to maintain the feed in the liquid phase. Typical C₄ cuts comprising the feed are liquid under pressure and do not require a solvent or diluent. Typical diluents suitable for use with the process include C₃ to C₆ alkanes, such as propane, butane, pentane, and isobutane.

0022The Lewis acid-Lewis base complex is typically introduced into the reactor as a liquid partially or completely dissolved in a solvent, or as a solid. Polymerization is preferably conducted at a pressure sufficient to maintain the C₄ feed in a liquid state at the reaction temperature, or at higher pressures. The initiator may be introduced to the monomer feed or the reaction mixture in liquid form together with the Lewis acid-Lewis base complex or, preferably, is introduced to the monomer feed or the reaction mixture in liquid form by a line separate from the Lewis acid-Lewis base complex addition line.

0023The liquid phase reaction mixture temperature is controlled by conventional means to be typically from -30°C to +50°C, preferably from -10°C to +30°C, more preferably from 0°C to +20°C, such as from 0°C to +10°C.

0024The residence time of the butene to be polymerized may be from 5 seconds to several hours, but will typically be from 1 to 300 minutes, such as 2 to 120 minutes, preferably from 5 to 60 minutes.

0025In order to insure even distribution of the catalyst within the reactor, turbulent flow of the reactor contents can be generated by mixing, or with suitable baffles, such as baffle plates or oscillating baffles, or by dimensioning the reactor tube cross sections so that a suitable flow velocity is established.

0026The process of the present invention is typically conducted in a manner achieving an isobutylene conversion in the range of from 20% up to 100%, preferably from 50% to 100%, and more preferably from 70% to 100%. The combined use of temperature control and catalyst feed rate permits formation of polybutenes having a <o ostyle="single">M</o>_n of from 400 Daltons to 4000 Daltons, preferably from 700 Daltons to 3000 Daltons, more preferably from 1000 Daltons to 2500 Daltons; a molecular weight distribution (MWD) of typically from 1.1 to 4.0, preferably from 1.5 to 3.0, an exo-olefin content of greater than 50 mol. %, preferably greater than 60 mol. %, more preferably greater than 70 mol. %, such as from 80 mol. % to 95 mol. %; a tetrasubstituted olefin content of less than 20 mol. %, such as less than 15 mol. %, preferably less than 10 mol. %, more preferably less than 5 mol. %; and a chlorine content of less than 10 mol. %, such as less than 5 mol. %, preferably less than 2 mol. %, more preferably less than 1 mol. %, based on the total moles of polymer.

0027Once the target molecular weight of the polymer is achieved, the polymer product can be discharged from the reactor and passed into a medium that deactivates the polymerization catalyst and terminates the polymerization. Suitable deactivation media include water, amines, alcohols and caustics. The polyisobutylene product can then be separated by distilling off the remaining C₄ hydrocarbons and low molecular weight oligomers. Preferably residual amounts of catalyst are removed, usually by washing with water or caustic.

0028This invention will be further understood by reference to the following examples, which are not intended, and should not be construed as listing all possible embodiments within the scope of the invention.

<u>EXAMPLES</u>

Preparation of Lewis acid (LA) Lewis base (LB) complex

0029All operations were performed in a dry N₂ atmosphere MBraun 150-M glove box (Innovative Technology Inc., Newburyport, MA). LA (3.9 mmol) was first dissolved in 3.36 ml of dichloromethane in a 20 ml vial equipped with a screw top with a septum. The vial was cooled down to 0°C. to form a 1 M complex. LB (3.9 mmol) was then added drop wise for 1 minute, while the solution was stirred. The solution was kept at +25°C and it was used within 1 hour of preparation.

Polymerizations

0030Polymerization was performed in a dry N₂ atmosphere MBraun 150-M glove box (Innovative Technology Inc., Newburyport, MA). Yields were determined gravimetrically. Number average molecular weights (<o ostyle="single">M</o>_n) and polydispersity indices (PDI) were determined by size exclusion chromatography. The distribution of end-groups was determined by ¹H NMR. The amount of unreacted chlorinated PIB (PIB-Cl), which is one indicator of whether the reaction can be driven further to completion, was determined by proton NMR spectroscopy.

EXAMPLE 1 (Comparative)

0031The LA.LB complex AlCl₃.dibutyl ether (0.022 M), in a 1:1 molar ratio, was used to polymerize isobutylene (IB) (1 M) in hexanes at -20°C for 20 minutes. IB and hexanes were premixed in a 75 ml culture tube, equipped with a screw top with septum. The LA.LB complex was added last. Polymerization was quenched using an excess of aqueous NH₄OH. <tables id="tabl0001" num="0001"><table frame="all"><tgroup cols="8"><colspec colnum="1" colname="col1" colwidth="22mm" /><colspec colnum="2" colname="col2" colwidth="13mm" /><colspec colnum="3" colname="col3" colwidth="11mm" /><colspec colnum="4" colname="col4" colwidth="20mm" /><colspec colnum="5" colname="col5" colwidth="19mm" /><colspec colnum="6" colname="col6" colwidth="33mm" /><colspec colnum="7" colname="col7" colwidth="36mm" /><colspec colnum="8" colname="col8" colwidth="15mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col8" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry>endo olefins</entry><entry>trisubstituted olefins</entry><entry>tetrasubstituted olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>8</entry><entry>1800</entry><entry>10</entry><entry>86</entry><entry>8</entry><entry>-</entry><entry>7</entry><entry>-</entry></row></tbody></tgroup></table></tables> As shown, AlCl₃ polymerizes IB in hexanes without added initiator. Initiation is by adventitious water which is inefficient and the amount of which is difficult to control. Monomer conversion was low and polydispersity was high.

EXAMPLE 2 (Comparative)

0032Polymerization of IB was performed as in Example 1 but with the LA.LB complex AlCl₃.diisopropyl ether (0.02 M) at 0°C. <tables id="tabl0002" num="0002"><table frame="all"><tgroup cols="8"><colspec colnum="1" colname="col1" colwidth="22mm" /><colspec colnum="2" colname="col2" colwidth="13mm" /><colspec colnum="3" colname="col3" colwidth="11mm" /><colspec colnum="4" colname="col4" colwidth="20mm" /><colspec colnum="5" colname="col5" colwidth="19mm" /><colspec colnum="6" colname="col6" colwidth="33mm" /><colspec colnum="7" colname="col7" colwidth="36mm" /><colspec colnum="8" colname="col8" colwidth="15mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col8" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry>endo olefins</entry><entry>trisubstituted olefins</entry><entry>tetrasubstituted olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>31</entry><entry>3400</entry><entry>3.6</entry><entry>64</entry><entry>=</entry><entry>-</entry><entry>23</entry><entry>-</entry></row></tbody></tgroup></table></tables> Monomer conversion remained low and polydispersity remained high. The higher polymerization temperature increased yield but concurrently resulted in more isomerization.

EXAMPLE 3 (Comparative)

0033The LA.LB complex AlCl₃.dibutyl ether (0.022 M), in a 1:1 molar ratio, was used to polymerize IB (1 M) in dichloromethane/hexanes 80/20 (v/v) in the presence of cumyl alcohol (CumOH, 0.018 M) and 2,6-ditert.-butylpyridine (DTBP, 0.006 M) at -40°C for 3 minutes. IB, hexanes, CumOH, and DTBP were premixed in a 75 ml culture tube, equipped with a screw top with a septum. The LA.LB complex was added last. The polymerization was quenched with excess of aqueous NH₄OH. Monomer conversion: 0 %. No conversion achieved with added initiator when chain transfer is suppressed with DTBP (proton trap) demonstrates that initiation is only via adventitious water. Cumyl alcohol, as added initiator, cannot be ionized by AlCl₃ in hexanes.

EXAMPLE 4 (Comparative)

0034Polymerization of IB was performed as in Example 1 but for 60 min. <tables id="tabl0003" num="0003"><table frame="all"><tgroup cols="8"><colspec colnum="1" colname="col1" colwidth="31mm" /><colspec colnum="2" colname="col2" colwidth="13mm" /><colspec colnum="3" colname="col3" colwidth="11mm" /><colspec colnum="4" colname="col4" colwidth="20mm" /><colspec colnum="5" colname="col5" colwidth="17mm" /><colspec colnum="6" colname="col6" colwidth="27mm" /><colspec colnum="7" colname="col7" colwidth="35mm" /><colspec colnum="8" colname="col8" colwidth="15mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col8" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry>endo olefins</entry><entry>trisubstitute d olefins</entry><entry>tetrasubstituted olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>21</entry><entry>2000</entry><entry>8.7</entry><entry>82</entry><entry>8</entry><entry>0</entry><entry>10</entry><entry>-</entry></row></tbody></tgroup></table></tables> Monomer conversion remained low and polydispersity remained high, although polymerization time was increased.

EXAMPLE 5 (Comparative)

0035Polymerization of IB was performed as in Example 4 but in the presence of 2-chloro-2, 4, 4-trimethylpentane, or "TMPCI" (0.015M). <tables id="tabl0004" num="0004"><table frame="all"><tgroup cols="8"><colspec colnum="1" colname="col1" colwidth="22mm" /><colspec colnum="2" colname="col2" colwidth="13mm" /><colspec colnum="3" colname="col3" colwidth="11mm" /><colspec colnum="4" colname="col4" colwidth="20mm" /><colspec colnum="5" colname="col5" colwidth="19mm" /><colspec colnum="6" colname="col6" colwidth="33mm" /><colspec colnum="7" colname="col7" colwidth="36mm" /><colspec colnum="8" colname="col8" colwidth="15mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col8" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry>endo olefins</entry><entry>trisubstituted olefins</entry><entry>tetrasubstituted olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>21</entry><entry>2000</entry><entry>2.3</entry><entry>79</entry><entry>9</entry><entry>0</entry><entry>11</entry><entry>-</entry></row></tbody></tgroup></table></tables> Comparing Example 5 to Example 4 demonstrates that TMPCl does not initiate the polymerization when AlCl₃ is the LA. Conversion, Mn and end-group distribution remained substantially the same.

EXAMPLE 6 (Comparative)

0036The LA.LB complex AlCl₃.diisobutyl ether (0.022 M), in a 1:1 molar ratio, was used to polymerize IB (1 M) in hexanes in the presence of TMPCI (0.015 M) and DTBP (0.006 M) at 0°C for 20 minutes. IB, hexanes, TMPCI, and DTBP were premixed in a 75 ml culture tube, equipped with a screw top with a septum. The LA.LB complex was added last. The polymerization was quenched with excess of aqueous NH₄OH. Monomer conversion: 0 % As with Example 3, no conversion achieved with added initiator when chain transfer is suppressed with DTBP (proton trap) demonstrating that initiation is only via adventitious water. TMPCI, as added initiator cannot be ionized by AlCl₃.diisobutyl ether in hexanes.

EXAMPLE 7 (Comparative)

0037The LA.LB complex AlCl₃.diisopropyl ether (0.02 M), in a 1:1 molar ratio, was used to polymerize IB (1 M) in hexanes in the presence of t-butyl alcohol or "tBuOH" (0.015 M) at 0°C for 20 minutes. IB, hexanes, and tBuOH were premixed in a 75 ml culture tube, equipped with a screw top with a septum. The LA.LB complex was added last. The polymerization was quenched with excess of methanol. <tables id="tabl0005" num="0005"><table frame="all"><tgroup cols="8"><colspec colnum="1" colname="col1" colwidth="22mm" /><colspec colnum="2" colname="col2" colwidth="11mm" /><colspec colnum="3" colname="col3" colwidth="11mm" /><colspec colnum="4" colname="col4" colwidth="20mm" /><colspec colnum="5" colname="col5" colwidth="20mm" /><colspec colnum="6" colname="col6" colwidth="33mm" /><colspec colnum="7" colname="col7" colwidth="36mm" /><colspec colnum="8" colname="col8" colwidth="15mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col8" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry>endo olefins</entry><entry>trisubstituted olefins</entry><entry>tetrasubstituted olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>11</entry><entry>900</entry><entry>2.1</entry><entry>92</entry><entry>4</entry><entry>0</entry><entry>4</entry><entry>0</entry></row></tbody></tgroup></table></tables> tBuOH as added initiator did not improve conversion relative to Example 2 (adventitious water as initiator), although exo content increased.

EXAMPLE 8 (Comparative)

0038Polymerization of IB was performed as in Example 6, except that cumyl chloride (CumCl) was used instead of TMPCI, and AlCl₃.diisopropyl ether was used instead AlCl₃.diisobutyl ether. Monomer conversion: 2 % As with Example 6, no conversion achieved with added initiator when chain transfer is suppressed with DTBP (proton trap) demonstrating that initiation is only via adventitious water. CumCl as added initiator cannot be ionized by AlCl₃.diisopropyl ether in hexanes.

EXAMPLE 9 (Comparative)

0039The LA.LB complex GaCl₃.diisopropyl ether (0.02 M), in a 1:1 molar ratio, was used to polymerize IB (1 M) in hexanes at 0°C for 20 minutes. IB and hexanes were premixed in a 75 ml culture tube, equipped with a screw top with a septum. Addition of the LA.LB complex started the polymerization. The polymerization was quenched with excess of aqueous NH₄OH. <tables id="tabl0006" num="0006"><table frame="all"><tgroup cols="8"><colspec colnum="1" colname="col1" colwidth="22mm" /><colspec colnum="2" colname="col2" colwidth="13mm" /><colspec colnum="3" colname="col3" colwidth="11mm" /><colspec colnum="4" colname="col4" colwidth="20mm" /><colspec colnum="5" colname="col5" colwidth="19mm" /><colspec colnum="6" colname="col6" colwidth="33mm" /><colspec colnum="7" colname="col7" colwidth="36mm" /><colspec colnum="8" colname="col8" colwidth="15mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col8" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry>endo olefins</entry><entry>trisubstituted olefins</entry><entry>tetrasubstituted olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>26</entry><entry>170 0</entry><entry>1.9</entry><entry>68</entry><entry>16</entry><entry>0</entry><entry>10</entry><entry>5</entry></row></tbody></tgroup></table></tables> In the absence of initiator, and with initiation via only adventitious water, monomer conversion remained low.

EXAMPLE 10 (Invention)

0040The LA.LB complex GaCl₃.diisopropyl ether (0.02 M), in a 1:1 molar ratio, was used to polymerize IB (1 M) in hexanes in the presence of TMPCI, (0.02 M) at 0°C for 20 minutes. IB, hexanes, and TMPCI were premixed in a 75 ml culture tube, equipped with a screw top with a septum. Addition of the LA.LB complex started the polymerization. The polymerization was quenched with excess of aqueous NH₄OH. <tables id="tabl0007" num="0007"><table frame="all"><tgroup cols="8"><colspec colnum="1" colname="col1" colwidth="22mm" /><colspec colnum="2" colname="col2" colwidth="11mm" /><colspec colnum="3" colname="col3" colwidth="11mm" /><colspec colnum="4" colname="col4" colwidth="20mm" /><colspec colnum="5" colname="col5" colwidth="20mm" /><colspec colnum="6" colname="col6" colwidth="33mm" /><colspec colnum="7" colname="col7" colwidth="36mm" /><colspec colnum="8" colname="col8" colwidth="15mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col8" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry>endo olefins</entry><entry>trisubstituted olefins</entry><entry>tetrasubstituted olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>100</entry><entry>900</entry><entry>2.1</entry><entry>77</entry><entry>9</entry><entry>0</entry><entry>8</entry><entry>7</entry></row></tbody></tgroup></table></tables>

EXAMPLE 11 (Comparative)

0041The LA GaCl₃ (0.02 M) was used to polymerize IB (1 M) in hexanes in the presence of TMPCI (0.02 M) and isopropyl ether (0.02 M) at 0°C for 20 minutes. IB, hexanes, isopropyl ether, and TMPCI were premixed in a 75 ml culture tube, equipped with a screw top with a septum. Addition of 1 M solution of GaCl₃ in hexane (0.02 M) started the polymerization. The polymerization was quenched with excess of aqueous NH₄OH. <tables id="tabl0008" num="0008"><table frame="all"><tgroup cols="8"><colspec colnum="1" colname="col1" colwidth="22mm" /><colspec colnum="2" colname="col2" colwidth="11mm" /><colspec colnum="3" colname="col3" colwidth="11mm" /><colspec colnum="4" colname="col4" colwidth="20mm" /><colspec colnum="5" colname="col5" colwidth="20mm" /><colspec colnum="6" colname="col6" colwidth="33mm" /><colspec colnum="7" colname="col7" colwidth="36mm" /><colspec colnum="8" colname="col8" colwidth="15mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col8" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry>endo olefins</entry><entry>trisubstituted olefins</entry><entry>tetrasubstituted olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>82</entry><entry>700</entry><entry>2.1</entry><entry>33</entry><entry>0</entry><entry>36</entry><entry>18</entry><entry>14</entry></row></tbody></tgroup></table></tables> Compare to Example 10. When the Lewis base (isopropyl ether) is not complexed initially to GaCl₃, exo-olefin content is reduced due to isomerization and cleavage.

EXAMPLE 12 (Invention)

0042Polymerization of IB was performed as in Example 10, except that 2-chloro-2-methylpropane (tBuCl) was used instead of TMPCI. [tBuCl] = 0.01 M. <tables id="tabl0009" num="0009"><table frame="all"><tgroup cols="8"><colspec colnum="1" colname="col1" colwidth="22mm" /><colspec colnum="2" colname="col2" colwidth="13mm" /><colspec colnum="3" colname="col3" colwidth="11mm" /><colspec colnum="4" colname="col4" colwidth="20mm" /><colspec colnum="5" colname="col5" colwidth="19mm" /><colspec colnum="6" colname="col6" colwidth="33mm" /><colspec colnum="7" colname="col7" colwidth="36mm" /><colspec colnum="8" colname="col8" colwidth="15mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col8" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry>endo olefins</entry><entry>trisubstituted olefins</entry><entry>tetrasubstituted olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>57</entry><entry>1700</entry><entry>1.5</entry><entry>70</entry><entry>8</entry><entry>0</entry><entry>6</entry><entry>16</entry></row></tbody></tgroup></table></tables> Compare to Example 10. Lower concentration of tBuCl relative to TMPCI resulted in a higher MW and similar exo-olefin content.

EXAMPLE 13 (Comparative)

0043Polymerization of IB was performed as in Example 10, but 2-hydroxy-2-methylpropane (tBuOH) was used instead of TMPCI. <tables id="tabl0010" num="0010"><table frame="all"><tgroup cols="8"><colspec colnum="1" colname="col1" colwidth="22mm" /><colspec colnum="2" colname="col2" colwidth="11mm" /><colspec colnum="3" colname="col3" colwidth="11mm" /><colspec colnum="4" colname="col4" colwidth="20mm" /><colspec colnum="5" colname="col5" colwidth="20mm" /><colspec colnum="6" colname="col6" colwidth="33mm" /><colspec colnum="7" colname="col7" colwidth="36mm" /><colspec colnum="8" colname="col8" colwidth="15mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col8" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry>endo olefins</entry><entry>trisubstituted olefins</entry><entry>tetrasubstituted olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>4</entry><entry>900</entry><entry>3.0</entry><entry>52</entry><entry>0</entry><entry>27</entry><entry>13</entry><entry>0</entry></row></tbody></tgroup></table></tables> Compare to Example 10. Significant isomerization and cleavage with tBuOH as initiator relative to TMPCI and almost no conversion

EXAMPLE 14 (Invention)

0044Polymerization of IB was performed as in Example 12 except that polymerization time was increased to 40 minutes. <tables id="tabl0011" num="0011"><table frame="all"><tgroup cols="8"><colspec colnum="1" colname="col1" colwidth="22mm" /><colspec colnum="2" colname="col2" colwidth="13mm" /><colspec colnum="3" colname="col3" colwidth="11mm" /><colspec colnum="4" colname="col4" colwidth="20mm" /><colspec colnum="5" colname="col5" colwidth="19mm" /><colspec colnum="6" colname="col6" colwidth="33mm" /><colspec colnum="7" colname="col7" colwidth="36mm" /><colspec colnum="8" colname="col8" colwidth="15mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col8" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry>endo olefins</entry><entry>trisubstituted olefins</entry><entry>tetrasubstituted olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>77</entry><entry>1700</entry><entry>1.6</entry><entry>80</entry><entry>11</entry><entry>0</entry><entry>7</entry><entry>2</entry></row></tbody></tgroup></table></tables> Compare to Example 12. Longer reaction time increased conversion, reduced PIB-Cl and increased exo-olefin content at constant MW.

EXAMPLE 15 (Comparative)

0045Polymerization of IB was performed as in Example 12, but without TMPCI. <tables id="tabl0012" num="0012"><table frame="all"><tgroup cols="8"><colspec colnum="1" colname="col1" colwidth="22mm" /><colspec colnum="2" colname="col2" colwidth="13mm" /><colspec colnum="3" colname="col3" colwidth="11mm" /><colspec colnum="4" colname="col4" colwidth="20mm" /><colspec colnum="5" colname="col5" colwidth="19mm" /><colspec colnum="6" colname="col6" colwidth="33mm" /><colspec colnum="7" colname="col7" colwidth="36mm" /><colspec colnum="8" colname="col8" colwidth="15mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col8" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry>endo olefins</entry><entry>trisubstituted olefins</entry><entry>tetrasubstituted olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>26</entry><entry>1700</entry><entry>1.9</entry><entry>68</entry><entry>16</entry><entry>0</entry><entry>10</entry><entry>5</entry></row></tbody></tgroup></table></tables> Compare to Example 12. In the absence of initiator, and with initiation via only adventitious water, monomer conversion is low.

EXAMPLE 16 (Comparative)

0046Polymerization of IB was performed as in Example 15 but in the presence of 2,6-di-tertbutyl pyridine (DTBP); [DTBP] = 0.005 M. <tables id="tabl0013" num="0013"><table frame="all"><tgroup cols="8"><colspec colnum="1" colname="col1" colwidth="22mm" /><colspec colnum="2" colname="col2" colwidth="10mm" /><colspec colnum="3" colname="col3" colwidth="11mm" /><colspec colnum="4" colname="col4" colwidth="20mm" /><colspec colnum="5" colname="col5" colwidth="21mm" /><colspec colnum="6" colname="col6" colwidth="33mm" /><colspec colnum="7" colname="col7" colwidth="36mm" /><colspec colnum="8" colname="col8" colwidth="15mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col8" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry>endo olefins</entry><entry>trisubstituted olefins</entry><entry>tetrasubstituted olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>2</entry><entry>---</entry><entry>---</entry><entry>93</entry><entry>0</entry><entry>0</entry><entry>0</entry><entry>7</entry></row></tbody></tgroup></table></tables> Compare to Example 15. Chain transfer is suppressed with DTBP (proton trap), demonstrating that initiation is only via adventitious water.

EXAMPLE 17 (Invention)

0047Polymerization of IB was performed as in Example 10, but in the presence of [DTBP] = 0.005 M. <tables id="tabl0014" num="0014"><table frame="all"><tgroup cols="8"><colspec colnum="1" colname="col1" colwidth="22mm" /><colspec colnum="2" colname="col2" colwidth="13mm" /><colspec colnum="3" colname="col3" colwidth="11mm" /><colspec colnum="4" colname="col4" colwidth="20mm" /><colspec colnum="5" colname="col5" colwidth="19mm" /><colspec colnum="6" colname="col6" colwidth="33mm" /><colspec colnum="7" colname="col7" colwidth="36mm" /><colspec colnum="8" colname="col8" colwidth="15mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col8" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry>endo olefins</entry><entry>trisubstituted olefins</entry><entry>tetrasubstituted olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>30</entry><entry>1000</entry><entry>1.7</entry><entry>67</entry><entry>6</entry><entry>0</entry><entry>5</entry><entry>22</entry></row></tbody></tgroup></table></tables> Compare to Example 10. Yield is reduced but not eliminated by DTBP. MW and exo-olefin content is maintained. Compare to Example 6 with AlCl₃ where no conversion was achieved in the presence of DTBP.

EXAMPLE 18 (Invention)

0048Polymerization of IB was performed as in Example 10, but at +10°C. <tables id="tabl0015" num="0015"><table frame="all"><tgroup cols="8"><colspec colnum="1" colname="col1" colwidth="22mm" /><colspec colnum="2" colname="col2" colwidth="13mm" /><colspec colnum="3" colname="col3" colwidth="11mm" /><colspec colnum="4" colname="col4" colwidth="20mm" /><colspec colnum="5" colname="col5" colwidth="22mm" /><colspec colnum="6" colname="col6" colwidth="31mm" /><colspec colnum="7" colname="col7" colwidth="35mm" /><colspec colnum="8" colname="col8" colwidth="15mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col8" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry>endo olefins</entry><entry>trisubstitute olefins</entry><entry>tetrasubstitute olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>100</entry><entry>1000</entry><entry>2.1</entry><entry>75</entry><entry>11</entry><entry>0</entry><entry>12</entry><entry>2</entry></row></tbody></tgroup></table></tables> Compare to Example 10. Conversions, MW and exo-olefin content maintained at higher temperature.

EXAMPLE 19 (Invention)

0049Polymerization of IB was performed as in Example 10, but at [IB] = 4 M. <tables id="tabl0016" num="0016"><table frame="all"><tgroup cols="8"><colspec colnum="1" colname="col1" colwidth="22mm" /><colspec colnum="2" colname="col2" colwidth="13mm" /><colspec colnum="3" colname="col3" colwidth="11mm" /><colspec colnum="4" colname="col4" colwidth="20mm" /><colspec colnum="5" colname="col5" colwidth="19mm" /><colspec colnum="6" colname="col6" colwidth="33mm" /><colspec colnum="7" colname="col7" colwidth="36mm" /><colspec colnum="8" colname="col8" colwidth="15mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col8" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry>endo olefins</entry><entry>trisubstituted olefins</entry><entry>tetrasubstituted olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>70</entry><entry>1900</entry><entry>1.7</entry><entry>78</entry><entry>9</entry><entry>0</entry><entry>8</entry><entry>5</entry></row></tbody></tgroup></table></tables> Compare to Example 10. Lower molar ratio of catalyst to monomer increased MW and decreased yield, but exo-olefin content is maintained.

EXAMPLE 20 (Invention)

0050Polymerization of IB was performed as in Example 10, but using GaCl₃.2, 4-dimethyl-3-pentanone LA.LB complex. <tables id="tabl0017" num="0017"><table frame="all"><tgroup cols="8"><colspec colnum="1" colname="col1" colwidth="22mm" /><colspec colnum="2" colname="col2" colwidth="13mm" /><colspec colnum="3" colname="col3" colwidth="11mm" /><colspec colnum="4" colname="col4" colwidth="20mm" /><colspec colnum="5" colname="col5" colwidth="19mm" /><colspec colnum="6" colname="col6" colwidth="33mm" /><colspec colnum="7" colname="col7" colwidth="36mm" /><colspec colnum="8" colname="col8" colwidth="15mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col8" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry>endo olefins</entry><entry>trisubstituted olefins</entry><entry>tetrasubstituted olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>65</entry><entry>1200</entry><entry>1.4</entry><entry>81</entry><entry>8</entry><entry>0</entry><entry>7</entry><entry>4</entry></row></tbody></tgroup></table></tables> Compare to Example 10. Ketone is effective as the Lewis base with comparable MW and exo-olefin content, but lower conversion.

EXAMPLE 21 (Comparative)

0051Polymerization of IB was performed as in Example 10, but using GaCl₃.triethylamine LA.LB complex. Monomer conversion: 0 % Compare to Example 10. Triethylamine is not an effective base.

EXAMPLE 22 (Comparative)

0052Polymerization of IB was performed as in Example 10, but using SnCl₄.diisopropyl ether LA.LB complex. Monomer conversion: 0 % Compare to Example 10. SnCl₄ is not an effective Lewis acid catalyst.

EXAMPLE 23 (Comparative)

0053Polymerization of IB was performed as in Example 10, but using SbCl₅.diisopropyl ether LA.LB complex. Monomer conversion: 0 % Compare to Example 10. SbCl₅ is not an effective Lewis acid catalyst.

EXAMPLE 24 (Invention)

0054Polymerization of IB was performed as in Example 10, using FeCl₃.diisopropyl ether LA.LB complex. <tables id="tabl0018" num="0018"><table frame="all"><tgroup cols="8"><colspec colnum="1" colname="col1" colwidth="31mm" /><colspec colnum="2" colname="col2" colwidth="11mm" /><colspec colnum="3" colname="col3" colwidth="11mm" /><colspec colnum="4" colname="col4" colwidth="19mm" /><colspec colnum="5" colname="col5" colwidth="19mm" /><colspec colnum="6" colname="col6" colwidth="30mm" /><colspec colnum="7" colname="col7" colwidth="33mm" /><colspec colnum="8" colname="col8" colwidth="15mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col8" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry>endo olefins</entry><entry>trisubstitute d olefins</entry><entry>tetrasubstitute d olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>47</entry><entry>900</entry><entry>1.5</entry><entry>91</entry><entry>4</entry><entry>0</entry><entry>2</entry><entry>3</entry></row></tbody></tgroup></table></tables> Compare to Example 10. FeCl₃ is an effective Lewis acid catalyst with higher exo-olefin content at similar MW, but lower conversion.

EXAMPLE 25 (Invention)

0055The LA.LB complex FeCl₃.chloromethyl ethyl ether (0.02 M), in a 1:1 molar ratio, was used to polymerize IB (1 M) in hexanes in the presence of tBuCl (0.02 M) at 0°C for 20 minutes. IB, hexanes, and tBuCl were premixed in a 75 ml culture tube, equipped with a screw top with a septum. Addition of the LA.LB complex started the polymerization. The polymerization was quenched with excess of aqueous NH₄OH. <tables id="tabl0019" num="0019"><table frame="all"><tgroup cols="7"><colspec colnum="1" colname="col1" colwidth="39mm" /><colspec colnum="2" colname="col2" colwidth="9mm" /><colspec colnum="3" colname="col3" colwidth="9mm" /><colspec colnum="4" colname="col4" colwidth="18mm" /><colspec colnum="5" colname="col5" colwidth="45mm" /><colspec colnum="6" colname="col6" colwidth="34mm" /><colspec colnum="7" colname="col7" colwidth="14mm" /><thead><row><entry morerows="1">Monomer Conversion (%)</entry><entry morerows="1">Mn</entry><entry morerows="1">PDI</entry><entry namest="col4" nameend="col7" align="left">end-group distribution (mol. %)</entry></row><row><entry>exo olefins</entry><entry valign="top">endo and trisubstituted olefins</entry><entry>tetrasubstituted olefins</entry><entry>PIB-Cl</entry></row></thead><tbody><row><entry>85</entry><entry>600</entry><entry>---</entry><entry>60</entry><entry>14</entry><entry>12</entry><entry>14</entry></row></tbody></tgroup></table></tables>

EXAMPLE 26

0056Polymerization of [IB] = 1 M, [TMPCI] = 0.02 M in hexanes at 0°C for 20 min. conducted using various Lewis Acid and Lewis Base combinations and complexes. In each case, polymerization was terminated with NH₄OH. <tables id="tabl0020" num="0020"><table frame="all"><tgroup cols="15"><colspec colnum="1" colname="col1" colwidth="8mm" /><colspec colnum="2" colname="col2" colwidth="25mm" /><colspec colnum="3" colname="col3" colwidth="20mm" /><colspec colnum="4" colname="col4" colwidth="18mm" /><colspec colnum="5" colname="col5" colwidth="24mm" /><colspec colnum="6" colname="col6" colwidth="15mm" /><colspec colnum="7" colname="col7" colwidth="13mm" /><colspec colnum="8" colname="col8" colwidth="11mm" /><colspec colnum="9" colname="col9" colwidth="19mm" /><colspec colnum="10" colname="col10" colwidth="17mm" /><colspec colnum="11" colname="col11" colwidth="14mm" /><colspec colnum="12" colname="col12" colwidth="15mm" /><colspec colnum="13" colname="col13" colwidth="13mm" /><colspec colnum="14" colname="col14" colwidth="15mm" /><colspec colnum="15" colname="col15" colwidth="19mm" /><thead><row><entry valign="top">#</entry><entry valign="top">LA.LB</entry><entry valign="top">[LA.LB] (M)</entry><entry valign="top">Soluble complex</entry><entry valign="top">INV (I) Comp. (C)</entry><entry valign="top">Yield (%)</entry><entry valign="top">Mn</entry><entry valign="top">PDI</entry><entry valign="top">Mn (NMR)</entry><entry valign="top">[PIB] (M)</entry><entry valign="top">exo (%)</entry><entry valign="top">endo (%)</entry><entry valign="top">tri (%)</entry><entry valign="top">tetra (%)</entry><entry valign="top">PIB-Cl (%)</entry></row></thead><tbody><row><entry>a</entry><entry>TaCl₅.iPr₂O</entry><entry align="char" char=".">0.01</entry><entry>No</entry><entry>C</entry><entry>4</entry><entry /><entry /><entry>2200</entry><entry>0.0010</entry><entry>17</entry><entry /><entry>19</entry><entry>22</entry><entry>42</entry></row><row><entry>b</entry><entry>TaCl₅.iPr₂O</entry><entry align="char" char=".">0.02</entry><entry>No</entry><entry>C</entry><entry>23</entry><entry>1600</entry><entry>6.9</entry><entry>1900</entry><entry>0.0071</entry><entry>22</entry><entry /><entry>34</entry><entry>27</entry><entry>17</entry></row><row><entry>C</entry><entry>MoCl₅.iPr₂O</entry><entry align="char" char=".">0.01</entry><entry>Yes</entry><entry>C</entry><entry>34</entry><entry>1000</entry><entry>4.8</entry><entry>1200</entry><entry>0.0169</entry><entry>28</entry><entry /><entry>30</entry><entry>21</entry><entry>21</entry></row><row><entry>d</entry><entry>MoCl₅.iPr₂O</entry><entry align="char" char=".">0.02</entry><entry>Yes</entry><entry>C</entry><entry>100</entry><entry>1400</entry><entry>2.9</entry><entry>900</entry><entry>0.0640</entry><entry>28</entry><entry /><entry>37</entry><entry>22</entry><entry>13</entry></row><row><entry>e</entry><entry>InCl₃.iPr₂O</entry><entry align="char" char=".">0.01</entry><entry>No</entry><entry>C</entry><entry>0</entry><entry /><entry /><entry /><entry /><entry /><entry /><entry /><entry /><entry /></row><row><entry>f</entry><entry>InCl₃.iPr₂O</entry><entry align="char" char=".">0.02</entry><entry>No</entry><entry>C</entry><entry>0</entry><entry /><entry /><entry /><entry /><entry /><entry /><entry /><entry /><entry /></row><row><entry>g</entry><entry>GaCl₃.tBuOH</entry><entry align="char" char=".">0.01</entry><entry>Yes</entry><entry>I</entry><entry>8</entry><entry>400</entry><entry>1.3</entry><entry>460</entry><entry>0.0108</entry><entry>75</entry><entry>10</entry><entry /><entry>6</entry><entry>9</entry></row><row><entry>h</entry><entry>GaCl₃.tBuOH</entry><entry align="char" char=".">0.02</entry><entry>Yes</entry><entry>I</entry><entry>24</entry><entry>900</entry><entry>1.2</entry><entry>460</entry><entry>0.0316</entry><entry>82</entry><entry>7</entry><entry /><entry>5</entry><entry>6</entry></row><row><entry>j</entry><entry>GaCl₃.γBuL</entry><entry align="char" char=".">0.01</entry><entry>Yes</entry><entry>I</entry><entry>16</entry><entry /><entry /><entry>600</entry><entry>0.0162</entry><entry>50</entry><entry /><entry>28</entry><entry>20</entry><entry>2</entry></row><row><entry>j</entry><entry>GaCl₃.yBuL</entry><entry align="char" char=".">0.02</entry><entry>Yes</entry><entry>I</entry><entry>50</entry><entry /><entry /><entry>600</entry><entry>0.0501</entry><entry>48</entry><entry /><entry>29</entry><entry>21</entry><entry>2</entry></row><row><entry>k</entry><entry>GaCl₃.AcN</entry><entry align="char" char=".">0.01</entry><entry>No</entry><entry>C</entry><entry>5</entry><entry /><entry /><entry>1100</entry><entry>0.0028</entry><entry>17</entry><entry /><entry>15</entry><entry>9</entry><entry>59</entry></row><row><entry>l</entry><entry>GaCl₃.AcN</entry><entry align="char" char=".">0.02</entry><entry>No</entry><entry>C</entry><entry>25</entry><entry /><entry /><entry>1100</entry><entry>0.0132</entry><entry>13</entry><entry /><entry>27</entry><entry>11</entry><entry>49</entry></row><row><entry>m</entry><entry>VCl₃.iPr₂O</entry><entry align="char" char=".">0.01</entry><entry>No</entry><entry>C</entry><entry>0</entry><entry /><entry /><entry /><entry /><entry /><entry /><entry /><entry /><entry /></row><row><entry>n</entry><entry>VCl₃.iPr₂O</entry><entry align="char" char=".">0.02</entry><entry>No</entry><entry>C</entry><entry>0</entry><entry /><entry /><entry /><entry /><entry /><entry /><entry /><entry /><entry /></row><row><entry>o</entry><entry>WCl₄.iPr₂O</entry><entry align="char" char=".">0.01</entry><entry>Yes</entry><entry>I</entry><entry>1</entry><entry /><entry /><entry>1000</entry><entry>0.0001</entry><entry>80</entry><entry>7</entry><entry /><entry>7</entry><entry>6</entry></row><row><entry>p</entry><entry>WCl₄.iPr₂O</entry><entry align="char" char=".">0.02</entry><entry>Yes</entry><entry>I</entry><entry>9</entry><entry /><entry /><entry>700</entry><entry>0.0071</entry><entry>78</entry><entry>8</entry><entry /><entry>9</entry><entry>5</entry></row></tbody></tgroup><tgroup cols="15" rowsep="0"><colspec colnum="1" colname="col1" colwidth="8mm" /><colspec colnum="2" colname="col2" colwidth="25mm" /><colspec colnum="3" colname="col3" colwidth="20mm" /><colspec colnum="4" colname="col4" colwidth="18mm" /><colspec colnum="5" colname="col5" colwidth="24mm" /><colspec colnum="6" colname="col6" colwidth="15mm" /><colspec colnum="7" colname="col7" colwidth="13mm" /><colspec colnum="8" colname="col8" colwidth="11mm" /><colspec colnum="9" colname="col9" colwidth="19mm" /><colspec colnum="10" colname="col10" colwidth="17mm" /><colspec colnum="11" colname="col11" colwidth="14mm" /><colspec colnum="12" colname="col12" colwidth="15mm" /><colspec colnum="13" colname="col13" colwidth="13mm" /><colspec colnum="14" colname="col14" colwidth="15mm" /><colspec colnum="15" colname="col15" colwidth="19mm" /><tbody><row><entry namest="col1" nameend="col15" align="justify">γ-butyro lactone ** acrylonitrile</entry></row></tbody></tgroup></table></tables>

EXAMPLE 27 (Invention)

0057Polymerization of [IB] = 1 M, [TMPCI] = 0.02 M in hexanes at 0°C for 20 min. Terminated with NH₄OH <tables id="tabl0021" num="0021"><table frame="all"><tgroup cols="12"><colspec colnum="1" colname="col1" colwidth="9mm" /><colspec colnum="2" colname="col2" colwidth="26mm" /><colspec colnum="3" colname="col3" colwidth="21mm" /><colspec colnum="4" colname="col4" colwidth="18mm" /><colspec colnum="5" colname="col5" colwidth="10mm" /><colspec colnum="6" colname="col6" colwidth="11mm" /><colspec colnum="7" colname="col7" colwidth="20mm" /><colspec colnum="8" colname="col8" colwidth="17mm" /><colspec colnum="9" colname="col9" colwidth="16mm" /><colspec colnum="10" colname="col10" colwidth="26mm" /><colspec colnum="11" colname="col11" colwidth="14mm" /><colspec colnum="12" colname="col12" colwidth="17mm" /><thead><row><entry valign="top">#</entry><entry valign="top">LA.LB</entry><entry valign="top">[LA.LB] (M)</entry><entry valign="top">Yield (%)</entry><entry valign="top">Mn</entry><entry valign="top">PDI</entry><entry valign="top">Mn(NMR)</entry><entry valign="top">[PIB] (M)</entry><entry valign="top">exo (%)</entry><entry valign="top">exo-cpld** (%)</entry><entry valign="top">tri (%)</entry><entry valign="top">tetra (%)</entry></row></thead><tbody><row><entry>a</entry><entry>HfCl₄.iPr₂O</entry><entry align="char" char=".">0.01</entry><entry>50</entry><entry /><entry /><entry>1500</entry><entry align="char" char=".">0.0195</entry><entry>40</entry><entry>13</entry><entry>29</entry><entry>19</entry></row><row><entry>b</entry><entry>HfCl₄.iPr₂O</entry><entry align="char" char=".">0.02</entry><entry>100</entry><entry /><entry /><entry>1300</entry><entry align="char" char=".">0.0553</entry><entry>52</entry><entry>5</entry><entry>27</entry><entry>17</entry></row><row><entry>C*</entry><entry>HfCl₄.iPr₂O</entry><entry align="char" char=".">0.02</entry><entry>92</entry><entry /><entry /><entry>1500</entry><entry align="char" char=".">0.0369</entry><entry>46</entry><entry>10</entry><entry>24</entry><entry>19</entry></row><row><entry>d</entry><entry>HfCl₄.1.5iPr₂O</entry><entry align="char" char=".">0.01</entry><entry>15</entry><entry /><entry /><entry>650</entry><entry align="char" char=".">0.0142</entry><entry>53</entry><entry>24</entry><entry>14</entry><entry>10</entry></row><row><entry>e</entry><entry>HfCl₄.1.5iPr₂O</entry><entry align="char" char=".">0.02</entry><entry>34</entry><entry /><entry /><entry>600</entry><entry align="char" char=".">0.0328</entry><entry>51</entry><entry>25</entry><entry>14</entry><entry>10</entry></row></tbody></tgroup><tgroup cols="12" rowsep="0"><colspec colnum="1" colname="col1" colwidth="9mm" /><colspec colnum="2" colname="col2" colwidth="26mm" /><colspec colnum="3" colname="col3" colwidth="21mm" /><colspec colnum="4" colname="col4" colwidth="18mm" /><colspec colnum="5" colname="col5" colwidth="10mm" /><colspec colnum="6" colname="col6" colwidth="11mm" /><colspec colnum="7" colname="col7" colwidth="20mm" /><colspec colnum="8" colname="col8" colwidth="17mm" /><colspec colnum="9" colname="col9" colwidth="16mm" /><colspec colnum="10" colname="col10" colwidth="26mm" /><colspec colnum="11" colname="col11" colwidth="14mm" /><colspec colnum="12" colname="col12" colwidth="17mm" /><tbody><row><entry namest="col1" nameend="col12" align="justify">*[tBuCl] = 0.02 M, terminated with MeOH **exo-olefin that has coupled (dimerized)</entry></row></tbody></tgroup></table></tables>

EXAMPLE 28 (Invention)

0058Polymerization of [IB] = 1 M, by [HfCl₄.iPr₂O] = 0.02 M (DCM solution filtered through 450 nm PTFE membrane), [tBuCl] = 0.01 M in hexanes at 0°C. Terminated with MeOH. <tables id="tabl0022" num="0022"><table frame="all"><tgroup cols="11"><colspec colnum="1" colname="col1" colwidth="7mm" /><colspec colnum="2" colname="col2" colwidth="20mm" /><colspec colnum="3" colname="col3" colwidth="18mm" /><colspec colnum="4" colname="col4" colwidth="10mm" /><colspec colnum="5" colname="col5" colwidth="11mm" /><colspec colnum="6" colname="col6" colwidth="20mm" /><colspec colnum="7" colname="col7" colwidth="17mm" /><colspec colnum="8" colname="col8" colwidth="16mm" /><colspec colnum="9" colname="col9" colwidth="23mm" /><colspec colnum="10" colname="col10" colwidth="14mm" /><colspec colnum="11" colname="col11" colwidth="17mm" /><thead><row><entry valign="top">#</entry><entry valign="top">Time (min)</entry><entry valign="top">Yield (%)</entry><entry valign="top">Mn</entry><entry valign="top">PDI</entry><entry valign="top">Mn (NMR)</entry><entry valign="top">[PIB] (M)</entry><entry valign="top">exo (%)</entry><entry valign="top">exo-cpld (%)</entry><entry valign="top">tri (%)</entry><entry valign="top">tetra (%)</entry></row></thead><tbody><row><entry>a</entry><entry>5</entry><entry>64</entry><entry /><entry /><entry>1700</entry><entry align="char" char=".">0.0229</entry><entry>48</entry><entry>7</entry><entry>25</entry><entry>20</entry></row><row><entry>b</entry><entry>10</entry><entry>72</entry><entry /><entry /><entry>1750</entry><entry align="char" char=".">0.0247</entry><entry>47</entry><entry>7</entry><entry>27</entry><entry>19</entry></row><row><entry>c</entry><entry>20</entry><entry>89</entry><entry /><entry /><entry>1500</entry><entry align="char" char=".">0.0352</entry><entry>49</entry><entry>7</entry><entry>24</entry><entry>20</entry></row><row><entry>d</entry><entry>40</entry><entry>99</entry><entry /><entry /><entry>1500</entry><entry align="char" char=".">0.0403</entry><entry>52</entry><entry>7</entry><entry>23</entry><entry>18</entry></row><row><entry>e</entry><entry>60</entry><entry>100</entry><entry /><entry /><entry>1100</entry><entry align="char" char=".">0.0534</entry><entry>56</entry><entry>7</entry><entry>22</entry><entry>16</entry></row></tbody></tgroup></table></tables>

EXAMPLE 29 (Invention)

0059Polymerization of IB in C₄ feed composition IB = 35% 1-butene = 10%, 2-butene = 6% hexanes = 49% at 0°C. <tables id="tabl0023" num="0023"><table frame="all"><tgroup cols="12"><colspec colnum="1" colname="col1" colwidth="8mm" /><colspec colnum="2" colname="col2" colwidth="25mm" /><colspec colnum="3" colname="col3" colwidth="17mm" /><colspec colnum="4" colname="col4" colwidth="14mm" /><colspec colnum="5" colname="col5" colwidth="14mm" /><colspec colnum="6" colname="col6" colwidth="15mm" /><colspec colnum="7" colname="col7" colwidth="15mm" /><colspec colnum="8" colname="col8" colwidth="11mm" /><colspec colnum="9" colname="col9" colwidth="11mm" /><colspec colnum="10" colname="col10" colwidth="15mm" /><colspec colnum="11" colname="col11" colwidth="14mm" /><colspec colnum="12" colname="col12" colwidth="13mm" /><thead><row><entry valign="top">#</entry><entry valign="top">[GaCl₃.iPr₂O]</entry><entry valign="top">[TMPCI]</entry><entry valign="top">Time (min)</entry><entry valign="top">Yield (%)</entry><entry valign="top">Mn (NMR)</entry><entry valign="top">Mn (GPC)</entry><entry valign="top">PDI</entry><entry valign="top">exo (%)</entry><entry valign="top">PIB-Cl (%)</entry><entry valign="top">endo (%)</entry><entry valign="top">tetra (%)</entry></row></thead><tbody><row><entry>a</entry><entry align="char" char=".">0.01</entry><entry align="char" char=".">0.01</entry><entry>20</entry><entry>9</entry><entry>900</entry><entry>1000</entry><entry align="char" char=".">1.9</entry><entry>55</entry><entry>36</entry><entry>6</entry><entry>2</entry></row><row><entry>b</entry><entry align="char" char=".">0.01</entry><entry align="char" char=".">0.01</entry><entry>60</entry><entry>10</entry><entry>1100</entry><entry>1200</entry><entry align="char" char=".">3.3</entry><entry>66</entry><entry>21</entry><entry>9</entry><entry>4</entry></row><row><entry>c</entry><entry align="char" char=".">0.02</entry><entry align="char" char=".">0.01</entry><entry>20</entry><entry>19</entry><entry>1200</entry><entry>1700</entry><entry align="char" char=".">2.5</entry><entry>75</entry><entry>15</entry><entry>7</entry><entry>4</entry></row><row><entry>d</entry><entry align="char" char=".">0.02</entry><entry align="char" char=".">0.01</entry><entry>60</entry><entry>33</entry><entry>1500</entry><entry>1900</entry><entry align="char" char=".">2.4</entry><entry>85</entry><entry>3</entry><entry>8</entry><entry>4</entry></row><row><entry>e</entry><entry align="char" char=".">0.01</entry><entry align="char" char=".">0.02</entry><entry>20</entry><entry>18</entry><entry>1100</entry><entry>1200</entry><entry align="char" char=".">3.2</entry><entry>66</entry><entry>23</entry><entry>8</entry><entry>3</entry></row><row><entry>f</entry><entry align="char" char=".">0.01</entry><entry align="char" char=".">0.02</entry><entry>60</entry><entry>19</entry><entry>1100</entry><entry>1300</entry><entry align="char" char=".">3.1</entry><entry>69</entry><entry>17</entry><entry>10</entry><entry>4</entry></row><row><entry>g</entry><entry align="char" char=".">0.02</entry><entry align="char" char=".">0.02</entry><entry>20</entry><entry>28</entry><entry>1300</entry><entry>1500</entry><entry align="char" char=".">2.7</entry><entry>81</entry><entry>7</entry><entry>7</entry><entry>4</entry></row><row><entry>h</entry><entry align="char" char=".">0.02</entry><entry align="char" char=".">0.02</entry><entry>60</entry><entry>36</entry><entry>1300</entry><entry>1700</entry><entry align="char" char=".">2.7</entry><entry>81</entry><entry>7</entry><entry>7</entry><entry>4</entry></row></tbody></tgroup></table></tables>

EXAMPLE 30 (Invention)

0060Polymerization of IB in C₄ feed composition IB = 44% 1-butene = 26.4%, trans 2-butene = 14.7%, hexanes = 14.5% at 0°C. <tables id="tabl0024" num="0024"><table frame="all"><tgroup cols="12"><colspec colnum="1" colname="col1" colwidth="8mm" /><colspec colnum="2" colname="col2" colwidth="26mm" /><colspec colnum="3" colname="col3" colwidth="17mm" /><colspec colnum="4" colname="col4" colwidth="14mm" /><colspec colnum="5" colname="col5" colwidth="13mm" /><colspec colnum="6" colname="col6" colwidth="15mm" /><colspec colnum="7" colname="col7" colwidth="15mm" /><colspec colnum="8" colname="col8" colwidth="11mm" /><colspec colnum="9" colname="col9" colwidth="11mm" /><colspec colnum="10" colname="col10" colwidth="15mm" /><colspec colnum="11" colname="col11" colwidth="13mm" /><colspec colnum="12" colname="col12" colwidth="13mm" /><thead><row><entry valign="top">#</entry><entry valign="top">[GaCl₃.iPr₂.O]</entry><entry valign="top">[TMPCI]</entry><entry valign="top">Time (min)</entry><entry valign="top">Yield (%)</entry><entry valign="top">Mn (NMR)</entry><entry valign="top">Mn (GPC)</entry><entry valign="top">PDI</entry><entry valign="top">exo (%)</entry><entry valign="top">PIB-Cl (%)</entry><entry valign="top">endo (%)</entry><entry valign="top">tetra (%)</entry></row></thead><tbody><row><entry>a</entry><entry align="char" char=".">0.01</entry><entry align="char" char=".">0.01</entry><entry>20</entry><entry>10</entry><entry>1200</entry><entry>1600</entry><entry align="char" char=".">3.1</entry><entry>64</entry><entry>27</entry><entry>6</entry><entry>3</entry></row><row><entry>b</entry><entry align="char" char=".">0.01</entry><entry align="char" char=".">0.01</entry><entry>60</entry><entry>14</entry><entry>1600</entry><entry>1700</entry><entry align="char" char=".">3.1</entry><entry>70</entry><entry>17</entry><entry>9</entry><entry>4</entry></row><row><entry>c</entry><entry align="char" char=".">0.02</entry><entry align="char" char=".">0.02</entry><entry>20</entry><entry>27</entry><entry>1400</entry><entry>1600</entry><entry align="char" char=".">2.6</entry><entry>74</entry><entry>15</entry><entry>8</entry><entry>4</entry></row><row><entry>d</entry><entry align="char" char=".">0.02</entry><entry align="char" char=".">0.02</entry><entry>60</entry><entry>46</entry><entry>1300</entry><entry>1400</entry><entry align="char" char=".">3.0</entry><entry>85</entry><entry>4</entry><entry>8</entry><entry>3</entry></row></tbody></tgroup></table></tables>

0061While certain representative embodiments and details have been provided to illustrate the invention, it will be apparent to the skilled artisan that various product and process changes from those disclosed herein may be made without departing from the scope of the present invention. The appended claims define the scope of the invention