Silicone polyether copolymers and method for their manufacture

Silicone and polyether copolymers and process for their preparation

The invention relates to new silicone and polyether copolymers and a process for its preparation, in which a polyether modified with alkoxysilyl groups in terminal position and / or in lateral position is reacted with silanes and / or siloxanes which carry at least one labile group against hydrolysis, alone or in admixture with siloxanes that do not carry any labile group against hydrolysis, in a process step by hydrolysis and condensation reaction.

The compounds according to the invention represent a new class of silicone and polyether copolymers, in which the binding of the siloxane body to the polyether takes place through stable SiC bonds against hydrolysis. The new compounds are referred to below as silicone and polyether copolymers, even if the structure does not eventually cover the characteristics of a polymer ether and / or a silicone in the usual sense. However, for the person skilled in the art, the structural coincidence of elements with a polyether and silicone structure with those of the new compounds is clearly evident.

Within the framework of this invention, the term "polyether" comprises both polyether, polyetherols, polyether alcohols, polyether esters, but also polyether carbonates, which eventually are used in a synonymous manner with each other. In such a case, it is not necessary that the term "poly" should be accompanied, since it is a plurality of ether functionalities or alcohol functionalities in the molecule or polymer. Rather, it only indicates that at least repetitive units of individual monomeric links or compositions that have a higher molar mass are present and, in addition, still have a certain polydispersity. The word fragment "POLI" comprises, in relation to this invention, not only exclusively compounds with at least 3 repetitive units of one or more monomers in the molecule, but, in particular, also those compositions of compounds that have a weight distribution molecular and, in this case, have an average molecular weight of at least 200 g / mol. In the case of this definition, the circumstance is considered that in the sector of the technique considered, it is customary to designate compounds of this type and as polymers even if they do not appear to satisfy a definition of polymer analogously to the OECD or REACH guidelines.

Known state of the art:

Polyether-siloxanes can be used in a versatile manner, since their properties, in particular their hydrophilic / hydrophobic balance, can be influenced and adjusted to the desired value by the appropriate choice of the siloxane block or siloxane blocks, on the one hand, and by the proper constitution of the polyether block

<dl><dt /><dd>or of the polyether blocks. </dd></dl>

In the case of silicone and polyether copolymers, in principle, there is a distinction between systems linked to SiOC

<dl><dt /><dd>or SiC. While labile SiOC-bound systems against hydrolysis can be prepared by reacting hydroxy-functional polyethers with chlorosiloxanes or alkoxysiloxanes, SiC-linked systems are obtained by catalyzed hydrosilylation with noble polyether metals, most of the times unsaturated once, with hydrogen-siloxanes. Hydrosilylation catalyzed with noble metals of allyl polyethers is in competition with the allyl-propenyl transposition reaction. This secondary reaction is not only undesirable because it requires the use of excess polyether and, with it, is accompanied by a dilution of the product, but the hydrolytic degradation of the propenyl polyethers leads to the formation of propionaldehyde, which gives the product , among others, an unpleasant smell.</dd></dl>

EP 0368195 A1 describes the so-called inverse silicone and polyether copolymers which, in contrast to the usual structures with a central silicone skeleton, have a polyether several times unsaturated as a central skeleton, which in the second stage is modified by hydrosilylation with monofunctional hydrogen-siloxanes. Several times unsaturated polyether is prepared by alkoxylation of alkylene oxides in admixture with olefinically unsaturated epoxides such as, for example, allyl glycidyl ethers. The olefinic epoxide can be distributed statistically or be incorporated into the block-like polyether chain, a chain that, in the case of an alkaline catalysis, can usually be constituted with up to a chain length and, thus, a molar mass of approximately 4000 g / mol. Certainly, EPA1-0 368 195 claims a range of molecular weights from 650 g / mol to 20,000 g / mol, but only polyethers with molecular weights of 1020 g / mol to 1640 g / mol are disclosed. Depending on the temperatures of

reaction and catalyst concentrations, the allylic double bonds can be isomerized already during alkaline alkoxylation to form propenyl ethers. The portions of the allylic double bond of the several unsaturated polyether, thus prepared, can then be reacted by hydrosilylation catalyzed by noble metals with silanes or SiH-functional siloxanes purified by distillation. An advantage of teaching EP-A1-0 368 195 is that the products are not diluted by excess propenyl polyethers. The high product purity of these reverse polyether siloxanes is disclosed in EPA1-0 368 195 with the aid of gel permeation chromatograms. In spite of this, EP-A1-0 368 195 admits that in the case of hydrosilylation of several times unsaturated polyethers, only less than 90 mol% of the allyl groups are reacted and that the remaining unsaturated groups are present in the form of labile propenyl functions against hydrolysis. With this, the problem of odor affection by the hydrolytic release of propionaldehyde is not resolved. Since viscosities are not disclosed in EP-A1-0 368 195, it is not inferred if there is a development of molecular weight and, thus, of the viscosity by other side reactions eventually coupled to the reaction of transposition of allyl-propenyl during hydrosilylation. As is known to those skilled in the art, and the storage of a polyether siloxane containing propenyl at room temperature leads to a development of the molar mass and the formation of odor. In order to improve storage stability and avoid odor involvement, the known state of the art discloses various deodorization procedures which, as an additional stage of the process, increase costs.

EP-A1-0 506 086 describes the preparation of reverse silicone and polyether copolymers in a two-stage process. In the first stage a polyether is unsaturated several times unsaturated with triethoxysilane. The alkoxysilyl-functional polyether obtained is then reacted, under hydrolytic conditions, with trimethylchlorosilane under evolution of hydrogen chloride gas. Also according to the teaching of EP-A1-0 506 086 only 85 mol% of the allyl groups is hydrosilylated. Compared to a hydrosilylation in a stage of ((CH3) 3SiO) 3SiH, briefly mentioned as M3T ', a polyether several times unsaturated, the two-stage process offers, through the intermediate stage of the alkoxysilyl-functional polyether, certainly yields higher overall, but in the hydrosilylation stage performance losses comparable to the teaching of EP-A1-0 368 195 have been recorded by the allyl-propenyl transposition reaction. Certainly, the bad smell condition of the final product may have been reduced due to the hydrolytic conditions of the second stage and the distillation treatment, but in this case it is not a highly selective reaction that leads to very pure products, since The degree of modification of the silicone and polyether copolymer can only be adjusted indirectly through the recipe and, in addition, strongly depends on the oscillations of the process in the hydrosilylation and in the magnitude, linked with it, of the secondary reactions. As shown in Example II disclosed in EP-A1-0 506 086, a viscous product is already obtained in the hydrolysis stage which remains viscous after the reaction with trimethylchlorosilane disclosed in Example III. Since viscosities are not disclosed, it is not inferred if an increase or decrease in the viscosity of the already viscous product takes place in the second stage. As is customary for the person skilled in the art, the increases in viscosity in the case of reactions are an indication of a development of the molar mass, whether this has been caused by an intentional prolongation of the chain or also by a cross-linking. unintended polymer chains in a secondary reaction. Other technical drawbacks of the process process disclosed in EP-A1-0 506 086 result from the evolution of hydrogen chloride gas from an alcoholic solution. Strongly corrosive exhaust gas must be collected in washing devices. To the extent that organic chlorine compounds are also contained in the exhaust gas as secondary products, the exhaust air must be further purified.

Alkoxysilyl-functional polymers of the most diverse chemical structure find application, among others, as glue and reactive and curable sealing materials in the presence of moisture, as binders, as coating and surface modifying agents for substrates most diverse inorganic and organic, among them, p. eg particles, fibers, fabric and flat structures of all kinds, as well as raw materials for foams in canisters free of isocyanate (sealing materials and foamable adhesives). In the case of a particularly widespread type of alkoxysilane-functional polymers, they are pre-polymers terminated in alkoxysilane. These may consist of different links. Usually, these prepolymers have an organic main chain, that is, they are constituted, for example, by polyurethanes, polyethers, polyesters, polyacrylates, polyvinyl esters, ethylene and olefin copolymers, styrene and butadiene copolymers or polyolefins, described, p. eg, in WO 2005/100482, EP-A1-1967550, US 7,365,145, US 3,627,722, US 3,632,557, as well as in US 3,971,751. Together with them, they are also

however, systems whose main chain is composed entirely or at least in part of organosiloxanes described, among others, in WO 96/34030.

The reaction of alkoxysyl-functional polyethers with silanes or siloxanes leads to coatings in the state of the art known in the sense of a hardening of the reactive material. Examples are JP 2005113063 or JP 11012473.

In order to effect a good intermolecular cross-linking during hardening, trialkoxy-functional silanes are used, such as, for example, methyltriethoxysilane, partly also in admixture with dimethyldiethoxysilane, and / or tetraalkoxy-functional silanes such as tetraethoxysilane, or also its hydrolysates. Since the molar junction energy of a silicon-oxygen bond with 444 kJ / mol (source: Hollemann-Wiberg, Lehrbuch der Anorganischen Chemie, 101st edition, p. 141) is clearly above the junction energy of a bond carbon-oxygen of 358 kJ / mol, the constitution of a macromolecular network is thermodynamically preferred.

The plurality of the synthetic accesses described to pre-polymers terminated in alkoxysilane discloses only the silane functionalization at the ends of the pre-polymer chain. Patent application DE 10 2008 000360.3, not yet published, describes a process for the preparation of alkoxysilyl-functional polyethers that allows a silane functionalization both in the polymer chain and at the end of the chain.

The mission of the present invention therefore consisted in creating, by means of a basically different synthesis procedure, access to new polyethers free of propenyl ether groups, modified with alkoxysilyl groups, alkoxysiloxanyl groups and / or siloxanyl groups - individually or in a mixture each -.

Another mission of the present invention is to enable a process for the preparation of these new silicone and polyether copolymers in the form of stable storage compounds that are free of disturbing by-products. Storage stability within the meaning of the present invention means that the viscosity of the final product, in the case of exclusion of water and storage at room temperature, after one year does not yet show any significant increase in viscosity of more than 20 % of initial value. This is important, particularly, for high molecular weight products with molar masses greater than 10,000 g / mol, preferably greater than 20,000 g / mol, since the starting viscosity of these products is already so high that only gelation is required for gelation. of a minimal and spectroscopically undetectable amount of crosslinking chains. The constitution of the viscosity is conditioned, for example, by gelation, triggered by intermolecular hydrolysis and condensation reactions of the alkoxysilyl groups or by secondary or cross-linking reactions in the presence of propenyl ether groups.

The problems are solved by preparing new silicone and polyether copolymers of the formula (1) with an inverse chemical structure, so far not capable of being prepared.

Object of the present invention are compounds free of propenyl ether groups corresponding to copolymers

where a1 is an integer of 0, 1 or 2, a2 is an integer of 1, 2 or 3, b is an integer of 0, 1 or 2, preferably 0 or 1, particularly preferably it is 0, and the

5 sum of a1, a2 and b is equal to 3, c is an integer from 0 to 22, preferably from 0 to 12, particularly preferably from 0 to 8, very particularly preferably from 0 to 4 and, in particular, is equal to 1 or 3, d is an integer from 1 to 500, preferably 1 to 100, particularly preferably 2 to 20 and very particularly preferably 2 to 10, 10 and is an integer from 0 to 10,000, preferably 1 to 2000, particularly preferably 2 to 2000 and, in particular, from 2 to 500, f is an integer from 0 to 1,000, preferably 0 to 100, particularly preferably 0 to 50 and, in particular, from 0 to 30, g is an integer from 0 to 1,000, preferably 0 to 200, particularly preferably 0 to 100 and, in particular, 0 to 70, h, i and j, independently of one another, are integers from 0 to 500, preferably from 0 to 300,

particularly preferably from 0 to 200 and, in particular from 0 to 100, n is an integer 2 and 8 and

twenty R, independently of one another, represents one or more identical or different radicals, chosen from alkyl radicals having 1 to 20, in particular 1 to 6 carbon atoms, linear or branched, saturated, unsaturated once or several times, or halogen groups -alkyl with 1 to 20 carbon atoms. Preferably, R corresponds to methyl, ethyl, propyl, isopropyl, n-butyl and sec-butyl groups; as well as,

R1 is a hydroxyl group or an oxy-organic radical with 1 to 1,500 carbon atoms, saturated or unsaturated,

25 linear, branched or cyclic, or additionally substituted, where the chain may also be interrupted by heteroatoms such as O, S, Si or N, or is a radical containing an oxyaromatic system, or R1 is an unsaturated ether-functional group, wherein no double CC linkage is in β position with respect to an oxygen, or double CC bonds occur particularly preferably only in terminal position, preferably it is an alkoxy, arylalkoxy or alkylalkyl group and, in particular a

30 polyether radical, in which the carbon chain may be interrupted by oxygen atoms, or is an oxy-aromatic group fused once or several times, or is an organic radical with silicone content, possibly branched,

R2 or R3 are the same or, independently of each other, they are H and / or a saturated and / or unsaturated hydrocarbon radical once and / or several times, also additionally substituted, if necessary

35 monovalent or polyvalent, wherein the radicals R2 and R3 may be cycloaliphatically bridged through the Y fragment; And it may not be present or it may be a methylene bridge with 1 or 2 methylene units; if Y is not present, then the hydrocarbon radical for R2 or R3 is, independently of one another, a radical with 1 to 20 carbon atoms, linear or branched;

40 R5 or R6 are the same or, independently of each other, they are H and / or a saturated and / or unsaturated monovalent hydrocarbon radical once and / or several times, also additionally substituted; R4 corresponds to an alkyl radical of 1 to 24 carbon atoms, linear or branched, or to an aromatic or cycloaliphatic radical that can eventually carry alkyl groups on its part; R7 and R8 are, independently of each other, hydrogen, alkyl, alkoxy, aryl or aralkyl groups,

R9

Four. Five , R10, R11 and R12 are, independently of each other, hydrogen, alkyl, alkenyl, alkoxy, aryl or aralkyl groups, wherein the hydrocarbon radical may be bridged through the Z fragment in a cycloaliphatic or aromatic manner, and Z may represent both an alkylene radical and also divalent alkenylene,

R13

is hydrogen or W, particularly preferably is hydrogen, 50 W represents an organo-modified, linear or branched or cyclic silyl or siloxanyl radical of the formula (2)

Formula (2) wherein k is an integer from 0 to 200, preferably from 0 to 50 and, in particular, from 0 to 5, l is an integer from 0 to 200, preferably from 0 to 50 and, in particular from 0 to 5, m is an integer from 0 to 200, preferably from 0 to 50, and in particular from 0 to 5, X is a hydrocarbon radical with 1 to 20 carbon atoms, linear, cyclic or branched, aliphatic or

aromatic, saturated or unsaturated, which may eventually contain heteroatoms such as

oxygen, nitrogen, phosphorus or sulfur, but which is preferably a methyl group, X1 is hydrogen or a hydrocarbon radical with 1 to 20 carbon atoms, linear, cyclic or branched,

aliphatic or aromatic, saturated or unsaturated, and may contain heteroatoms such as oxygen,

nitrogen, phosphorus or sulfur, but is different from X, X2 is X, X1 or an alkoxy group, with the proviso that the sum of the fragments daj is greater than or equal to 3 when R1 is composed only of a monomer or oligomer, and with the proviso that the fragments with the indices d, e, fy / oh can be freely interchangeable with each other as well as the fragments with the indices k, ly / om can be freely interchangeable with each other, that is, within the polyether chain or the siloxane chain they can be exchanged with each other and can be presented statistically distributed next to each other as a block of choice and, thus, can be exchanged with each other in the sequence within the polymer chain

The different monomer units of both the fragments with the dafyh and kam indices as well as the polyoxyalkylene chain optionally present of the R1 substituent may be constituted as blocks with each other or may be subjected to a statistical distribution.

These new compounds, designated hereinafter as silicone and polyether copolymers, can also be obtained, free of gelation, from organic polymers with high alkoxysilyl functionality, with a functional density of up to 4 trialkoxysilyl equivalents per 1000 g / mol by complete or partial hydrolysis and condensation reactions of the alkoxysilyl groups linked to the polymer with reactive silanes, preferably alkoxy- or acyloxy-silanes, hydrolytically dissociable monomers, possibly other reactive silicon compounds as well as water and, if necessary, in the presence of a catalyst. The new compounds, also according to the invention, represent a new class of silicone and polyether copolymers in which the binding of the siloxane body to the polyether takes place through stable SiC bonds against hydrolysis.

It is a particular differential feature and a technical advantage of this new class of silicone and polyether copolymers compared to technical polyether-siloxanes usually obtained through the hydrosilylation catalyzed with noble metals that do not contain so-called excess polyethers, which, in conventionally prepared products, they account for most of the time 20-40% by weight of the total product and do not confer to the system an often undesirably high hydrophilicity in surfactant applications. The silicone polyethers according to the invention therefore represent, in relation to the absence of free organic polyether portions, new copolymers. Its chemical composition and, with it, its hydrophilic-hydrophobic balance can be controlled within wide ranges through the flexible choice of synthesis conditions. Thus, the length and arrangement of the hydrophobic siloxane body and the polyether part, most of the time more hydrophilic, can be reproducibly adjusted within wide ranges. Another advantage of this new class of silicone and polyether copolymers is that no secondary reaction leads to the formation of propenyl ethers which, in the case of product storage and under the action of air humidity, are hydrolytically decomposed. Therefore, no propionaldehyde that could lead to an unwanted smell of the product is released.

Unlike the silicone polyethers usually prepared through hydrosilylation, the process according to the invention also offers access to silicone polyethers carrying alkoxysilyl groups.

reagents, whose polyether part is functionalized with hydrolytically crosslinkable alkoxysilyl and / or alkoxysiloxanyl groups. In the case of a suitable choice of reaction conditions in the preparation process according to the invention such as, for example, a sub-stoichiometric dimension with respect to the trialkoxysilyl groups of monoalkoxysilane and water of less than three equivalents of monoalkoxysilane and less than 1.5 moles of water for each trialkoxysilyl equivalent, thus hydrolysable reactive silicone polyethers are obtained, whose silicone content can be adjusted through the degree of reaction of the alkoxysilyl groups to form siloxanyl groups.

Surprisingly, it has now been found that the hydrolytic reaction, acid catalyzed and / or catalyzed with metal complexes, of alkoxysilyl-functional polyethers with reactive silanes such as alkoxysilanes and / or siloxanes leads to reverse polyether and silicone copolymers free of propenyl ether groups . The propenyl contents are determined by 1 H-NMR spectroscopy and, in the case of the present invention, are in contents less than 1% by weight, preferably less than 0.1% by weight of the CC double bond portions. During the reaction no new double CC bonds are constituted and the portion of double CC bonds in the polymer is not affected.

The hydrolytic reaction, catalyzed with acids and / or catalyzed with a metal complex, described in accordance with the invention, is surprising to the person skilled in the art and was by no means predictable, since the known state of the art only knows extensive gelation by intermolecular crosslinking of alkoxysilyl-functional polyethers, reactive silanes such as alkoxysilanes or alkoxysiloxanes in the presence of water.

Since a silicon-oxygen bond is already present in the alkoxysilanes and siloxanes compared to chlorosilanes, it is expected that reactions with alkoxysilanes and alkoxysilyl-functional polyethers run more slowly than the reactions with chlorosilanes and, in addition, are accompanied by side reactions such as, for example, gelation by intermolecular cross-linking between alkoxysilyl-functional polyethers. Even more surprising is the finding disclosed here that by means of a hydrolytic reaction, catalyzed with acids and / or catalyzed with a metal complex, of alkoxysilyl-functional polyethers with alkoxysilanes and / or siloxanes, products free of gelation are obtained.

According to the process according to the invention, silicone and polyether copolymers of the formula are obtained

(1) by hydrolysis and condensation reactions of polymer-linked alkoxysilyl groups of an organic polymer, in particular of an alkoxysilyl-functional polyether.

Another object of the invention are preferably silicone and polyether copolymers according to formula (1), with the proviso that R1 is a hydroxyl radical or a saturated oxy-organic radical, possibly branched, or unsaturated, but not containing no double non-aromatic CC bond in β position with respect to an oxygen.

Accordingly, another object of the invention are also, particularly preferably, silicone and polyether copolymers according to formula (1), with the proviso that R1 is an alkoxy or saturated polyether radical.

Modifiable polyethers according to the invention with water and with at least one reactive monomeric silane and, possibly, other silicon compounds under optionally equilibrating modifying conditions in their alkoxysilyl groups, hereinafter referred to as silyl polyethers, are compounds of the formula (3). Silyl polyethers of this type can be obtained by catalytic alkoxylation reaction with double metal cyanide (DMC) of epoxy-functional silanes and possibly other epoxides in a starting compound R1-H (4) OH-functional.

The preparation and the types of epoxy structure that can be used are described extensively in DE 10 2008 000360.3 not previously disclosed. The compounds thus prepared contain the alkoxysilyl functions that can be modified at the terminal position, also isolated, accumulated in block form or also statistically dispersed in the polyoxyalkylene chain.

The silyl polyethers of the formula (3) are distinguished because in relation to their structural constitution and molar mass they can be prepared in a pre-established and reproducible manner. The sequence of the monomer units can be configured variably within wide limits. Epoxy monomers can be arranged side by side as blocks arbitrarily or statistically incorporated into the polymer chain. The fragments incorporated in the resulting polymer chain by the reaction under the ring opening of the reaction components can be freely interchangeable with each other in their sequence, with the limitation that cyclic anhydrides (indexes i and j) are present in the polyether structure as well as carbon dioxide (g index) inserted statistically, that is, not in homologous blocks.

5 If in the alkoxylation according to DE 10 2008 000360.3 several times epoxy-functional alkoxysilanes are used as monomer, silyl polyethers of the formula (3) are formed which form highly functionalized networks in which polyether chains are linked to each other through bridges –CH2-O- (CH2) c-Si (CH2) cO-CH2- that in each case start from R1-H and that in their sequence contain fragments freely

10 interchangeable that were included in the resulting polymer chain by reaction under the ring opening of the reaction components. Therefore, highly complex and highly functionalized structures are formed. Here too the functionalities can be preset to a desired sector of application. The degree of crosslinking and the complexity of the polymer structures obtained increase with the increasing epoxy functionality of the silyl monomers. Very particularly preferred as monomers 3

fifteen glycidyloxyalkyltrialkoxysilanes.

In this case, the fragments, which were included in the resulting polymer chain through the reaction under the opening of the ring, are distributed within the framework of the preceding definitions as a block or distributed statistically, not only in the chain of a unit polyether structural but also distributed

twenty statistically through the plurality of the polyether structural units formed and joined together through bridges -CH2-O- (CH2) c-Si- (CH2) cO-CH2-. The variety of structural variations of the products of the process does not, therefore, allow any absolutely unambiguous formulistic description.

Preferably, as silyl polyethers, those of the formula (3) which are formed from a starting compound R1-H are used

(3) - see also figure 2

30 wherein a is an integer from 1 to 3, preferably 3, b is an integer from 0 to 2, preferably 0 to 1, particularly preferably is 0, and the sum

of a and b is equal to 3, the indices c, d, e, f, g, h, i and j, as well as the radicals R, R1 to R12 as well as Y and Z correspond to the meanings defined in formula (1).

The different monomer units of both the fragments with the dafyh indexes and also of the polyoxyalkylene chain, possibly present of the substituent R1, can be constituted as a block between them or they can also be subjected to a statistical distribution.

40 Starting compounds are understood as substances that form the beginning (beginning) of the polyether molecule (3) to be prepared, which is obtained by the transposition reaction of epoxy-functional monomers.

R1 is a fragment that comes from the initiator or from the starting compounds for the alkoxylation reaction according to formula (4)

R1- H 10

(4)

(H belongs to the OH group of an alcohol or a phenolic compound) where the initiator of the formula (4) is it can be used alone or in mixtures with each other and has at least one reactive hydroxyl group; therefore the Initiator can also be water.

As starting compounds R1-H (4) OH-functional compounds with masses are preferably used molars of 18 (water) at 10,000 g / mol, in particular 50 to 2000 g / mol and with 1 to 8, preferably 1 to 4 groups hydroxyl Preferably, as initiators of the formula (4), those in which R1 is a hydroxyl group or a oxy-organic radical with 1 to 1,500 carbon atoms, saturated or unsaturated, linear, branched or cyclic or additionally substituted, which may also be interrupted by heteroatoms such as O, S, Si or N, or a radical containing an oxy-aromatic system; or R1 is an unsaturated ether-functional group, in the that no double CC link is in position β with respect to an oxygen, or double CC bonds are presented only in a particularly preferred terminal position, preferably an alkoxy, arylalkoxy or alkylarylalkoxy and, in particular, a polyether radical, in which the carbon chain may be interrupted by oxygen atoms, or a condensed oxy-aromatic group once or several times or an organic radical with possibly branched silicone content. In addition, R1-H may represent an oxyalkyl-functional siloxane or an oxy-functional siloxane polyether. The chain length of the polyether radicals having alkoxy, arylalkoxy or alkylarylalkoxy groups Employable as a starting compound is arbitrary. Preferably, the polyether, alkoxy, arylalkoxy or alkylarylalkoxy contains 1 to 1,500 carbon atoms, particularly preferably 2 to 300 atoms of carbon, in particular 2 to 100 carbon atoms.

Compounds of the formula (4) chosen from the group of alcohols, polyetherols or phenols are preferred. Preferably, a monovalent polyether alcohol or R 1-H alcohol is used as the starting compound or polyvalent (H belongs to the OH group of alcohol or phenol) or also water. Advantageously, low molecular weight polyetherols with 1 to 8 hydroxyl groups and molar masses of 50 are used at 2000 g / mol which, in turn, were previously prepared by DMC catalyzed alkoxylation, in quality of starter compounds (4). By way of example for compounds of the formula (4) there may be mentioned water, allyl alcohol, butanol, octanol, dodecanol, stearyl alcohol, 2-ethylhexanol, cyclohexanol, benzyl alcohol, ethylene glycol, propylene glycol, di-, tri-y poly-ethylene glycol, 1,2-propylene glycol, di- and poly-propylene glycol, 1,4-butanediol, 1,6-hexanediol, trimethylolpropane, glycerol, pentaerythrite, sorbitol, cellulose-sugar, lignin or also other compounds that are based on substances natural and carriers of hydroxyl groups. Arbitrary compounds with 1 to 20 are suitable for compounds with aliphatic and cycloaliphatic OH groups phenolic OH functions. To them belong, for example, phenol, alkyl- and aryl-phenols, bisphenol A and novolacs.

The silyl polyethers of the formula (3) are composed of chains substituted with alkoxysilyl groups which, by means of choice of daj fragments, corresponding to the fragments included in the polymer chain by reaction under the ring opening of the reaction components, they are highly functionalized in a pre-established manner and, with it, can be adjusted to the most diverse application sectors.

The indexes reproduced in the formulas here collected and the value ranges of the indicated indices have been to understand, therefore, as the average values ​​of the possible statistical distribution of the structures really present and / or their mixtures. This is also true for structural formulas themselves reproduced exactly as such, such as, for example, for formulas (1), (2) or (3).

Depending on the epoxy-functional alkoxysilane used and other monomers that may be used, as well as possibly also carbon dioxide, ester-modified carbonate silyl polyethers can be obtained. Preferably, the alkoxysilane unit in the compound of the formula (3) is a trialkoxysilane unit.

As the investigations by 29Si-NMR and GPC show, the presence conditioned by the procedure of OH groups in position at the end of the chain conditions the possibility for transesterification reactions in the silicon atom both during the DMC catalyzed preparation and also, e.g. eg, at a stage of process set out below. In such a case, the alkyl radical R attached to the silicon through an oxygen atom it is normally exchanged for a long chain modified alkoxysilyl polymer radical. CPG curves Bimodal as well as multimodal confirm that alkoxylation products contain, together with

species that have not been esterified as reproduced in formula (3), those with double, partly triple or even multiple molar mass. Formula (3) reproduces, therefore, only in a simplified manner the complex chemical reality. Monomodal in the sense of the present inventions means the presence of only one maximum in the gel permeation chromatogram, while in the case of a multimodal distribution at least one other local maximum is present outside the main peak. A multimodal distribution can be caused by transesterification reactions during the preparation process of the silylpolyether, or also by other technical adjustments of the process such as, for example, a certain dosing sequence chosen from initiator and epoxide monomers. The presence of transesterification products in the silylpolyether does not, therefore, necessarily condition a multimodal molecular weight distribution. The degree of transesterification in the silyl group can be determined independently of the molecular weight distribution using 29Si-NMR spectra.

Accordingly, the silyl polyethers of the formula (3) represent compositions that also contain compounds in which the sum of the indices (a) plus (b) in the formula (3) is, on a statistical average, less than 3, given that a part of the OR groups can be replaced by silylpolyether groups. The compositions therefore contain species that are configured in the silicon atom under dissociation of R-OH and condensation reaction with the reactive OH group of another molecule of the formula (3). This reaction can run repeatedly until, e.g. For example, all RO groups have been exchanged in silicon for other molecules of the formula (3). The presence of more than one signal in the typical 29Si-NMR spectra of these compounds bases the appearance of silyl groups with a different substitution model. The preferred values ​​and ranges indicated for indices (a) to (j) should therefore be understood also as mean values ​​throughout the different species not individually conceivable. The plurality of chemical structures and molar masses is also reflected in the wide molar mass distributions of Mw / Mn, most often&gt; 1.5, totally unusual for typical polyethers for silyl polyethers of the formula (3) and which based on conventional DMC.

Furthermore, the object of the invention is the process mentioned in the following for the preparation of new silicone and polyether copolymers with which gelling-free products are obtained.

In the case of the preparation process according to the invention, polyethers of the formula (3) functionalized with alkoxysilyl groups are reacted, under hydrolytic conditions and catalysis with acids and / or catalysis with metal complexes with silanes and / or hydrolytically siloxanes dissociable and condensable such as, for example, alkoxysilanes. Siloxanes within the meaning of this invention are those of the formula (5),

Formula (5) wherein X and X1 have the meaning defined in formula (2), X3 is a hydroxyl group or X2 according to the definition in formula (2), k1 is an integer from 0 to 200, preferably 0 at 50 and, in particular, 0 to 5, l1 is an integer from 0 to 200, preferably 0 to 50 and, in particular, 0 to 5, m1 is an integer from 0 to 200, preferably 0 to 50 and, in particular, 0 to 5, with the proviso that the sum of the indices k1, l1 and m1 is an integer from 1 to 600, preferably 1 to 150 and, in particular, 1 to 15.

The reactive silanes used, preferably alkoxysilanes, are compounds of the formula (6)

UxSiV (4-x) (6)

wherein U represents the same or different groups, not hydrolysable in the presence of water and catalytic amounts of Brönstedt acid at temperatures of up to 100 ° C, V represents the same or different groups, hydrolysable in the presence of water and catalytic amounts of Brönstedt acid at temperatures of up to 100 ° C and x represents 1,

two or 3. Hydrolysable means within the framework of this invention that at least 80% of the groups can be hydrolyzed under the chosen conditions and, with it, can be dissociated.

In formula (6) the hydrolysable V groups may be, for example, H, halogen groups, alkoxy (preferably methoxy, ethoxy, i-propoxy, n-propoxy or butoxy), aryloxy (preferably phenoxy), acyloxy (preferably acetoxy or propionyloxy), acyl (preferably acetyl), amino, monoalkylamino or dialkylamino, or sulfonic acid ester groups. The non-hydrolysable U radical may be, for example, an alkyl, alkenyl, alkynyl, aryl, alkylaryl or aralkyl radical. The alkyl chain may have 0 to 50, preferably 0 to 22 carbon atoms or it may also be a silicone radical. The radicals U and V may optionally have one or more usual substituents such as, for example, halogen or alkoxy.

Non-hydrolyzable U radicals according to formula (6) with functional groups can be chosen from the range of methacryloxyalkylene and acryloxyalkylene radicals such as, for example, methacryloxymethyl, acryloxymethyl, methacryloxyethyl, acryloxyethyl, methacryloxypropyl acryloxypropyl, methacryloxypropyl, methacryloxypropyl and methacryloxy radical.

Preferably, silanes of the formula (6) contain one to two labile groups V in the form of alkoxy groups, acyloxy groups, chlorine groups or also sulfonic acid ester groups such as, for example, trimethylmethoxysilane, triphenylmethoxysilane, trimethylethoxysilane, triphenylethoxysilane, triphenylsilanol, trimethylisopropoxysilane, trimethyl-n-propoxysilane, trimethylchlorosilane, trimethylacetoxysilane, trimethylsilyl ester of trifluoromethanesulfonic acid, trimethylsilyl ester of the, dimethyldimethoxysilane, diphenyldimethoxysilane, dimethyldiethoxysilane, diphenyldiethoxysilane, diphenylsilanediol, difenilmetiletoxisilano, dimetildiisopropoxisilano, n-propoxysilane dimentildi-dimethyldichlorosilane, dimethyldiacetoxysilane trifluoroacetic acid, dimetilsilílico trifluoromethanesulfonic acid diester, diester dimetilsilílico trifluoroacetic acid. Particularly preferred are trimethylmethoxysilane, trimethylethoxysilane, dimethyldimethoxysilane and dimethyldiethoxysilane. Silanes with chlorine content are used only in small quantities, subordinate to the other raw materials of silane and siloxane. Preferably, the use of chlorine-containing silanes is completely avoided.

Another object of the invention is therefore also a process characterized in that as silanes of the formula (6) chlorine-free silanes are used in which the group V are alkoxy and / or acyloxy groups.

In addition, cyclic siloxanes such as, for example, hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane or dodecamethylcyclohexasiloxane, or also low molecular weight silicone oils with chain lengths of up to 20 siloxy units can be used, in order to incorporate silicone chains in one step Longer Preferably, hexamethyldisiloxane and decamethylcyclopentasiloxane are used individually or in admixture.

The silanes (6) are used stoichiometrically or in a molar excess with respect to the alkoxysilyl groups (3) linked to polyether. To avoid intermolecular crosslinking and gel formation, it may be advantageous to use excess reactive silanes (6). The molar ratio of polyxether-linked alkoxyl-functional alkoxysilyl groups is in the range of 1 to 50, preferably 1 to 25.

An object of the invention is therefore also a process for the preparation of silicone and polyether copolymers of the formula (1), characterized in that alkoxysilyl functional organic polymers free of gelation are reacted by complete or partial hydrolysis at choice and reaction of condensation of the alkoxysilyl groups bound to the polymer together with reactive silanes, as well as water and in the presence of a catalyst.

Another object of the invention is also a process for the preparation of silicone and polyether copolymers of the formula (1), characterized in that, based on the molar content of trialkoxysilyl groups, sub-stoichiometric amounts of water and / or monoalkoxysilane are used per trialkoxysilyl equivalent. .

Another object of the invention is also a process for the preparation of silicone and polyether copolymers of the formula (1), characterized in that functionalized polyethers are reacted with alkoxysilyl groups under hydrolytic conditions and catalysis with acids and / or catalysis with metal complexes with silanes and / or siloxanes that can be dissociated and condensed in a reactive hydrolytic manner.

Another object of the invention is a process, characterized in that silanes of the formula (6) and / or siloxanes of the formula (5) are used,

UxSiV (4-x) (6)

wherein U represents the same or different groups, not hydrolysable in the presence of water and catalytic amounts of Brönstedt acid at temperatures up to 100 ° C, V represents the same or different groups, hydrolysable in the presence of water and catalytic amounts of Brönstedt acid at temperatures of up to 100 ° C or hydroxyl groups and x represents 1, 2 or 3, and

Formula (5) wherein X and X1 have the meaning defined in formula (2), X3 is a hydroxyl group or X2 according to the definition in formula (2), k1 is an integer from 0 to 200, preferably 0 at 50 and, in particular, 0 to 5, l1 is an integer from 0 to 200, preferably 0 to 50 and, in particular, 0 to 5, m1 is an integer from 0 to 200, preferably 0 to 50 and, in particular, 0 to 5, with the proviso that the sum of the indices k1, l1 and m1 is an integer from 1 to 600, preferably 1 to 150 and, in particular, 1 to 15.

Organic or inorganic Brönstedt acids such as acetic acid are suitable as catalysts

or trifluoroacetic acid, mineral acids such as, for example, sulfuric acid or hydrochloric acid, phosphoric acid, its monoesters and / or diesters such as, e.g. eg, butyl phosphate, (iso) propyl phosphate, dibutyl phosphate, etc., but also sulphonic acids such as, for example, methanesulfonic acid, trifluoromethanesulfonic acid or toluenesulfonic acid. In addition, solid balancing acids can be used according to the known state of the art, these are acid clays or acid ion exchange resins such as, for example, products known under the trade names Amberlite®, Amberlyst® or Dowex® and Lewatit®. Also suitable are Lewis acids such as, for example, aluminum trichloride, titanium (IV) chloride, boron trihalides, or also organic borane with subtractor substituents d electrons such as fluoroaryl borane, in particular tris- (pentafluorophenyl) are suitable borano As other catalysts for the crosslinking of compounds carrying alkoxysilyl groups, organic tin compounds such as, e.g. eg, dibutyltin dilaurate, dioctyltin dilaurate, dibutyltin diacetylacetonate, dibutyltin diacetate or dibutyltin dioctoate, etc. Particularly preferred is the use of trifluoromethanesulfonic acid and trifluoroacetic acid.

The catalysts can be used individually or also in combination. The required amounts of the sum of catalysts are in the range of 0.01 to 15 percent by weight, preferably in the range of 0.1 to 6 percent by weight.

Another object of the invention is therefore also a process characterized in that trifluoromethanesulfonic acid and / or trifluoroacetic acid is preferably used as catalyst.

The process reaction steps for the preparation of the silicone and polyether copolymers of the formula (1) are composed of the hydrolysis and condensation reaction catalyzed under acidic conditions and in a distillation and neutralization stage. The process can be carried out in a staggered, semi-continuous manner in a loop reactor with tubes, continuously in a tube reactor or in a reaction in a single vessel. Neutralization can take place before or after distillation.

The hydrolysis and condensation reaction can be carried out at a pressure equal to or greater than normal pressure, 12

preferably at the pressure corresponding to the surrounding atmosphere, and at temperatures from 0 to 100 ° C, preferably at 40 to 80 ° C. After the end of the reaction, volatile by-products of the condensation can be removed, e.g. eg, by careful vacuum distillation. Distillation can take place from a boiler, continuously through a falling film evaporator or also by vacuum vaporization. If necessary or desired, neutralization can take place, e.g. ex. with a salt of a basic character, preferably with sodium hydrogen carbonate.

To the first stage of the process of the reaction of hydrolysis, condensation and, possibly, acid-catalyzed equilibration, a second stage of alkali-catalyzed equilibration can be joined in order to incorporate other functionalities in the new silicone and polyester copolymers. Thus, for example, cyclic or linear siloxanes containing optionally other functional groups such as, for example, amino groups, can be incorporated by equilibration, for example, using tetraalkylammonium compounds according to the known state of the art described, for example , in document DE 60116592.

The new silicone and polyether copolymers claimed in accordance with the invention are advantageously distinguished from the polyether siloxanes disclosed in EP 0368195 A1 and EP 0506086 A1, because none of the secondary products resulting from the reaction of transposition of allylpropenyl such as, for example, substituents that do not have double terminal bonds, in particular propenyl ethers and, eventually, also its hydrolysis products. The new silicone and polyether copolymers according to the invention preferably do not contain propenyl groups.

With this, the products are not only odor free directly after their preparation, but also during storage they do not release any carrier of new unwanted aroma.

Furthermore, the new silicone and polyether copolymers claimed in accordance with the invention advantageously differ from the polyether siloxanes disclosed in EP 0368195 A1 and EP 0506086 A1 by their low viscosity compared to the previous ones and their good storage stability such as guaranteed by the avoidance of intermolecular crosslinking. As the Comparative Example disclosed in this invention shows, the viscosity of a product prepared with trimethylchlorosilane according to the process disclosed in EP 0506086 A1 increases more than double its initial viscosity.

In addition, the new silicone and polyether copolymers claimed in accordance with the invention are advantageously differentiated from the polyether siloxanes disclosed in EP 0368195 A1 and EP0506086 A1 because they eventually not only contain bound siloxane groups, but, in addition to that , they may still contain alkoxysiloxanyl groups or also alkoxysilyl individually or in admixture. In contrast to the known processes for the preparation of silyl-functional polymers, in the case of the products according to the invention, they are siloxanil-functional polymers, whose chemically bonded silicone portion can be freely varied.

In addition, the new silicone and polyether copolymers claimed in accordance with the invention are distinguished from the polyether siloxanes disclosed in EP 0368195 A1 and EP 0506086 A1 because they preferably have an inherent multimodal molecular weight distribution, predetermined by the precursors , without that for that reason a dilution of the product takes place by secondary products such as, for example, excess polyethers present in classical polyether siloxanes. During the process according to the invention, the modality is also not affected most of the time. To the extent that transesterification products contained in the previous products are dissociated in whole or in part under hydrolytically acidic conditions, the modality can be reduced, for example from 3 to 2 as disclosed in Example 8 .

The process according to the invention has the advantage, in relation to the quality and storage stability of the final products, of the silicone and polyether copolymers prepared according to the invention and the metabolites produced therefrom and the compositions and formulations containing copolymers of silicone and polyether have no tendency to gel and, consequently, they can be stored over a long period of time, without changing the viscosity of the products in a decisive way.

Another object of the invention are compositions containing silicone and polyether copolymers according to formula (1) and other silicone surfactants, organic surfactants, solvents such as, for example, alkanes,

halogenated alkanes, substituted or unsubstituted aromatic compounds, esters, ethers, glycols, oils natural and synthetic origin or polyethers, amines, amides, acids, bases or their buffer systems for the adjustment of pH value, flame retardants, catalysts, antioxidants, additives to control rheological properties such as, for example, thickeners, humectants or equalizing agents, dispersing additives, fillers solid inorganic or solid organic particles, binding agents, solid or liquid dyes, stabilizers, UV absorbers, biocides and / or antistatic agents.

The process according to the invention also has the advantage over the procedure described in the EP-A1-0 506 086 that by avoiding the use of chlorosilanes no gas is manifested corrosive exhaust or any organic chlorine compound. Particularly advantageous, compared to procedure described in EP-A1-0 368 195 can be waived a modification by distillation of the silanes and siloxanes used as precursors.

The process according to the invention also allows the synthesis of silicone polyethers of the formula (1), which carry free reactive alkoxysilyl groups. Compounds of this type, in which the a1 index in formula (1) is on average greater than 0 and that per molecule have at least one Si-OR function, they are formed in the case of using a water defect and reactive U groups in the silane of the formula (6) in relation to the Si-O- groups R of the silylpolyether of the formula (3) used. Other objects of the invention result from the claims, whose dissemination content is part of the entire its scope of the description of this invention.

In the examples set out below, the present invention is described by way of example, without this, whose application spectrum results from the full description and claims, should be limited to the forms of embodiment mentioned in the examples.

GPC measurements for the determination of polydispersity and average molar masses were carried out under the following measurement conditions: combination of columns SDV 1000/10000 Å (length 65 cm), temperature 30 ° C, THF as mobile phase, flow rate 1 ml / min, sample concentration 10 g / l, RI detector, titration against polypropylene glycol pattern. OH indices were determined according to the cold acetylation method based on the prescription of C- analysis. V 17A (98) of the Deutschen Gesellschaft für Fettwissenschaft (DGF). The oxygen content of the silyl polyether epoxide was determined in the presence of conc. HCl. according to the principle of the titration with soda bleach. Viscosities were measured based on DIN 53019 with a brand rotation viscosimeter. Haake RV12 at 25 ° C. The ratio of the M, D and T units to each other was determined by 29Si-NMR spectroscopy in a NMR spectrometer of the Bruker business name and a frequency of 79.4 MHz. The NMR analysis method and the Valuation of the signals are described in textbooks and, therefore, is customary for the expert in the matter. (Bibliography: AJ Brandolini, D, D. Hills, “NMR-Spectra of Polymers and Polymer Additives” © 2000 Marcel Dekker Inc., Chapter IX.B.1, on pages 414 and following). The slight variations observed in the Following examples of the measured M / T ratios of the theoretical value 3: 1 is a measure of the degree of reaction reached. Thus, for example, an M / T ratio of 2.4: 1 means that 80% of the alkoxy substituents present in the previous product they were substituted by trimethylsiloxy groups. Conditioned by the Fourier analysis and the Weighted factors chosen, as well as the level of noise present in the spectra, deviations appear additional between graphically determined signal relationships and theoretically determined values. A Measured M / T ratio of 2.9: 1 can be found, by virtue of methodical measurement insecurity, in the interval of the theoretical value of 3: 1.

The following polyethers containing alkoxysilyl groups were used which were prepared according to DE 10 2008 000360.3 not yet disclosed according to the principle of the process of the alkoxylation of 3glycidyloxypropyltriethoxysilane (GLYEO) catalyzed by DMC with propylene oxide (OP) and ethylene oxide (OE):

SP-1 Silylpolyether:

Low molecular weight polyether, initiated by allyl alcohol, almost colorless and low viscosity with a molar mass average of approx. 1800 g / mol and double trialkoxysilane functionality. Chemical structure according to the dosage of monomers: allyl alcohol + (7.6 mol of OP / 15 mol of OE) + 2 mol of GLYEO + 1 mol of OP

Oxygen content of the epoxide &lt;0.05%, OH index 28.0 g / mol.

SP-2 Silylpolyether:

Short chain polyether, based on allyl alcohol, low viscosity, with an average molar mass of approx. 1350 g / mol and dual functionality of trialkoxysilane. Chemical structure according to the dosage of monomers: Poly (propylene-co-ethylene glycol) monoalylether (600 g / mol) + 2 mol of propylene oxide + 2 mol of GLYEO + 1 mol of propylene's OXID Oxygen content of epoxides &lt;0.05%, Mw conforming to GPC 4150 g / mol, viscosity 291.4 mPa * s (25 ° C)

Silylpolyether SP-3:

Short chain polyether, based on allyl alcohol, low viscosity with an average molar mass of approx. 1100 g / mol and dual functionality of trialkoxysilane. Chemical structure according to the dosage of monomers: Polyethylene glycol monoalylether (400 g / mol) + 2 mol of propylene oxide + 2 mol of GLYEO + 1 mol of oxide propylene Oxygen content of epoxides &lt;0.05%, viscosity 146.0 mPa * s (25 ° C) The CPG shows a multimodal curve with maximums at approximately 250, 700 and 3000 g / mol, a molar mass Mass average Mw of 4153 g / mol and a polydispersity Mw / Mn of 2.59.

Silylpolyether SP-4:

Low molecular weight polyether, initiated by octanol, almost colorless and low viscosity, with an average molar mass of approx. 3000 g / mol and sevenfold trialkoxysilane functionality. Chemical structure according to the dosage of monomers: 1-octanol + 8 mol of propylene oxide + (7 mol of GLYEO / 10 mol of propylene oxide) Oxygen content of the epoxide &lt;0.05%, OH 19.5 mg KOH / g, Mw according to GPC 2760 g / mol, viscosity (25.0ºC) 238.3 mPa * s

Silylpolyether SP-5:

High molecular weight polyether, initiated by polypropylene glycol, almost colorless and viscous, with an average molar mass of approx. 15400 g / mol and sixfold trialkoxysilane functionality. Chemical structure according to the monomer dosage: PPG (2000 g / mol) + 198 mol of OP + 6 mol of GLYEO + 4 mol of OP Oxygen content of the epoxide &lt;0.05%, the CPG shows a multimodal curve with maximums at approximately 5,500, 10,000 and 20,000 g / mol, a mass average molar mass Mw of 15,552 g / mol and a polydispersity Mw / Mn of 2.52.

Examples:

Example 1 (according to the invention)

In a 250 ml four-mouth flask, equipped with a KPG shaker, an internal thermometer, a dropping funnel and a distillation bridge, 30 g of trimethylethoxysilane are prearranged at room temperature and, with stirring, 0 , 45 ml of trifluoroacetic acid. After heating to 60 ° C, a mixture based on 37.2 g of silyl polyether SP-1 and 20.16 g of desalinated water is added dropwise over a period of one hour. The cloudy reaction mixture is stirred after the dosage is finished for three hours at 60 ° C. 3 g of sodium hydrogen carbonate are added and stirred for half an hour at room temperature. After filtration through a pleat filter, a clear solution is obtained. The ethanol resulting from the reaction is distilled off at 70 ° C and 5 to 15 mbar in the space of 45 minutes. A transparent, homogeneous and low viscosity product (&lt;250 mPa * s) is obtained. In the 29Si-NMR spectrum, signals from the starting compounds can no longer be recognized. The ratio of M units to T units amounts to 2.9 to 1 (theory 3: 1).

Example 2 (according to the invention)

In a 250 ml four-mouth flask, equipped with a KPG stirrer, an internal thermometer, a dropping funnel and a distillation bridge, 31.8 g of trimethylethoxysilane are prearranged at room temperature and, with stirring, add 0.42 ml of trifluoroacetic acid. After heating to 60 ° C, a mixture based on 30.0 g of SP-2 silyl polyether and 21.4 g of desalinated water is added dropwise over a period of 1.5 hours. The cloudy reaction mixture is stirred after the dosage is finished for three hours at 60 ° C. The ethanol that results during the reaction is distilled off at 60 ° C and 50 mbar within one hour. 1.7 g of sodium hydrogen carbonate are added and stirred for half an hour at room temperature. After filtration through a pleat filter, a transparent, homogeneous and yellowish product with a viscosity of 204 mPa * s at 25 ° C is obtained. In the 29Si-NMR spectrum, signals from the starting compounds can no longer be recognized. The ratio of M units to T units amounts to 2.7 to 1 (theory 3: 1).

Example 3 (according to the invention)

In a 250 ml four-mouth flask, equipped with a KPG shaker, an internal thermometer, a dropping funnel and a distillation bridge, 21.8 g of hexamethyldisiloxane are prearranged at room temperature and, with stirring, add 0.42 ml of trifluoroacetic acid. After stirring for one hour at 70 ° C, a mixture based on 30.0 g of silylpolyether SP-2 and 21.4 g of desalinated water is added dropwise over a period of one hour. The cloudy reaction mixture is stirred after the dosage is finished for three hours at 70 ° C. The ethanol that results during the reaction is distilled off at 70 ° C and 20 mbar within one hour. 1.7 g of sodium hydrogen carbonate are added and stirred for half an hour at room temperature. After filtration through a pleat filter, a transparent, homogeneous and yellowish product with a viscosity of 294.2 mPa * s at 25 ° C is obtained.

Example 4 (not according to the invention)

In a 250 ml four-mouth flask, equipped with a KPG stirrer, an internal thermometer, a dropping funnel and a distillation bridge, 29.2 g of trimethylchlorosilane are previously arranged at 50 ° C. A mixture based on 30.0 g of SP-2 silyl polyether and 24.2 g of desalinated water is added dropwise over a period of one hour at 50 ° C. The cloudy reaction mixture is stirred after the dosage is finished for three hours at 50 ° C. The acidic exhaust gas, released during the reaction, stains red to a dried pH paper. Upon completion of the reaction, all volatile components are distilled off at 50 ° C and 20 mbar for one hour. 1.7 g of sodium hydrogen carbonate are added and stirred for half an hour at room temperature. After filtration through a pleat filter, a transparent and yellowish product with a viscosity of 720 mPa * s is obtained, more than double the SP-2 silyl polyether. The ratio of M units to T units, determined from the 29Si-NMR spectrum, amounts to 0.9 to 1 (3: 1 theory).

Example 5 (according to the invention)

In a 250-ml four-neck flask, equipped with a KPG shaker, an internal thermometer, a drip funnel and a distillation bridge, 37.7 g of trimethylethoxysilane and 11.8 g of decamethylcyclopentasiloxane are pre-arranged at the temperature ambient and, with stirring, 0.5 ml of trifluoroacetic acid are added. After stirring for one hour at 70 ° C, a mixture based on 30.0 g of SP-3 silyl polyether and 13.6 g of desalinated water is added dropwise over a period of one hour. The cloudy reaction mixture is stirred after the dosage is finished for three hours at 70 ° C. The ethanol resulting from the reaction is distilled off at 70 ° C and at 50 mbar for one hour. 1.7 g of sodium hydrogen carbonate are added and stirred for half an hour at room temperature. After filtration through a pleat filter, a transparent, homogeneous and yellowish product with a viscosity of 87.5 mPa * s is obtained. In the 29Si-NMR spectrum, signals from the starting compounds can no longer be recognized. The ratio of units M to units D and T amounts to 2.7: 2.6: 1 (theory 3: 3: 1). The CPG shows a multimodal curve with maximums at approximately 500, 900 and 1400 g / mol, a mass average molar mass Mw of 1256 g / mol and a polydispersity Mw / Mn of 1.47.

Example 6 (according to the invention)

In a 250 ml four-mouth flask, equipped with a KPG agitator, an internal thermometer, a dropping funnel and a distillation bridge, 37.7 g of trimethylethoxysilane are prearranged at room temperature and, with stirring, add 0.7 g of dibutyltin diacetylacetonate. After heating to 70 ° C., a mixture based on 30.0 g of SP-3 silylpolyether and 13.6 g of deanilized water is added dropwise over a period of 1.5 hours. The cloudy reaction mixture is stirred after the dosage is finished for three hours at 70 ° C. Volatile reaction products are distilled off at 70 ° C and 20 mbar for one hour. A homogeneous, slightly cloudy, yellowish and slightly viscous product is obtained.

5 Example 7 (according to the invention)

In a 250 ml four-mouth flask, equipped with a KPG stirrer, an internal thermometer, a dropping funnel and a distillation bridge, 54.0 g of trimethylethoxysilane at room temperature 10 are pre-arranged and, with stirring, 0.5 ml of trifluoroacetic acid are added. After stirring for 30 minutes at 70 ° C, a cloudy mixture based on 30.0 g of silylpolyether SP-4 and 41.1 g of desalinated water is added dropwise over a period of 1.5 hours . The cloudy reaction mixture is stirred after the dosage is finished for three hours at 70 ° C. The ethanol resulting from the reaction is distilled off at 70 ° C and at 20 mbar for one hour. 1.7 g of sodium hydrogen carbonate are added and stirred for half an hour at

fifteen room temperature. After filtration through a pleat filter, a transparent, homogeneous and yellowish product with a viscosity of 217.6 mPa * s at 25 ° C is obtained. In the 29Si-NMR spectrum, signals from the starting compounds can no longer be recognized. The ratio of M units to T units amounts to 2.2 to 1 (theory 3: 1).

twenty Example 8 (according to the invention)

In a 250 ml four-mouth flask, equipped with a KPG shaker, an internal thermometer, a dropping funnel and a distillation bridge, 16.4 g of trimethylethoxysilane are prearranged at room temperature and 0.5 are added ml of trifluoroacetic acid and stir for 30 minutes at 70 ° C. 60.0 g of the very viscous SP-5 silylpolyether are mixed for the simplest dosage with 20.0 g of ethanol and requested with 12.5 g of desalinated water. This mixture is added dropwise to the acidified silane at 70 ° C under stirring over a period of 1.5 hours. The cloudy reaction mixture is stirred after the dosage is finished for three hours at 70 ° C. After distillation of ethanol at 70 ° C and 20 mbar, a transparent and homogeneous product is obtained which is less liquid and viscous than the SP-5 silyl polyether. In the 29Si-NMR spectrum not

30 signals from the starting compounds can already be recognized. The ratio of units M to units T amounts to 2.4 to 1 (theory 3: 1). The CPG shows a multimodal curve with maximums at approximately 5,500 and 10,000 g / mol, a mass average molar mass Mw of 9561 g / mol and a polydispersity Mw / Mn of 1.85.