Antistatic sheet
Abstract
PCT No. PCT/FR93/00310 Sec. 371 Date Oct. 4, 1994 Sec. 102(e) Date Oct. 4, 1994 PCT Filed Mar. 29, 1993 PCT Pub. No. WO93/20280 PCT Pub. Date Oct. 14, 1993According to the invention, it includes conductive pigments constituted by a substrate (chosen from the group including micas, talcum, kaolin, bentonites, montmorillionites or glass particles) which has a basic lamellar-type structure coated with an electroconductive layer of tin oxide doped with antimony. On at least one face, the sheet has a layer containing at least the conductive pigments having a basic lamellar-type structure and at least one hydrosoluble binder. Application as decorative paper for laminates.
Term
Term ended
Expired 29 March 2013, 13.5 years ago.
- Priority
- Filed
- Granted
- Expired
- Today
30 claims: 27 independent, 3 dependent
- 1Feuille de papier, ayant des propriétés antistatiques, comportant des pigments conducteurs dotés d'une couche électroconductrice d'oxyde métallique dopé caractérisée par le fait que les dits pigments conducteurs ont une structure de base de type lamellaire. Papierfolie mit antistatischen Eigenschaften, die leitende Pigmente aufweist, die mit einer elektrisch leitenden Schicht aus dotiertem Metalloxid versehen sind, dadurch gekennzeichnet, daß die leitenden Pigmente einen lamellenartigen Grundaufbau aufweisen. Sheet of paper, having antistatic properties, which includes conductive pigments provided with an electrically conductive layer of doped metal oxide, characterized in that the said conductive pigments have a lamellar-type basic structure.
- 2Feuille selon la revendication 1, caractérisée par le fait que les pigments ayant une structure lamellaire sont choisis parmi les micas, le talc, le kaolin, les bentonites, les montmorillionites ou les particules de verre. Folie nach Anspruch 1, dadurch gekennzeichnet, daß die einen Lamellenaufbau aufweisenden Pigmente unter Micas, Talk, Kaolin, Bentoniten, Montmorilloniten oder Glaspartikeln ausgewählt werden. Sheet according to Claim 1, characterized in that the pigments having a lamellar structure are selected from micas, talc, kaolin, bentonites, montmorillonites or particles of glass.
- 3Feuille selon les revendications 1 ou 2, caractérisée par le fait que l'oxyde métallique dopé de la couche électroconductrice est un oxyde d'étain dopé avec de l'antimoine. Folie nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das dotierte Metalloxid der elektrisch leitenden Schicht ein mit Antimon dotiertes Zinnoxid ist. Sheet according to Claim 1 or 2, characterized in that the doped metal oxide of the electrically conductive layer is an antimony-doped tin oxide.
- 4Feuille selon les revendications 2 à 3, caractérisée par le fait que le pigment conducteur est un mica revêtu d'une couche d'oxyde d'étain dopé avec de l'antimoine. Folie nach den Ansprüchen 2 bis 3, dadurch gekennzeichnet, daß das leitende Pigment eine Mica ist, die mit einer Schicht aus mit Antimon dotiertem Zinnoxid versehen ist. Sheet according to Claims 2 and 3, characterized in that the conductive pigment is a mica coated with a layer of antimony-doped tin oxide.
- 5Feuille selon les revendications 2 à 4, caractérisée par le fait que le pigment conducteur est un mica recouvert d'une couche d'oxyde de titane, éventuellement d'une couche de silice, et revêtu d'une couche d'oxyde d'étain dopé avec de l'antimoine. Folie nach den Ansprüchen 2 bis 4, dadurch gekennzeichnet, daß das leitende Pigment eine Mica ist, die mit einer Titanoxidschicht, gegebenenfalls mit einer Siliciumoxidschicht überzogen, und mit einer Schichte aus mit Antimon dotierten Zinnoxidschicht versehen ist. Sheet according to Claims 2 to 4, characterized in that the conductive pigment is a mica covered with a layer of titanium oxide, optionally with a layer of silica, and coated with a layer of antimony-doped tin oxide.
- 6Feuille selon les revendications 1 à 5, caractérisée par le fait qu'elle porte sur au moins une face une couche contenant au moins les dits pigments conducteurs et au moins un liant. Folie nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß sie auf mindestens einer Seite eine Schicht trägt, die mindestens die leitenden Pigmente und mindestens ein Bindemittel enthält. Sheet according to Claims 1 to 5, characterized in that it bears on at least one side a layer containing at least the said conductive pigments and at least one binder.
- 7Feuille selon la revendication 6, caractérisée par le fait que la quantité des dits pigments conducteurs déposée sur la feuille est comprise entre 1 et 10 g/m2, en poids sec. Folie nach Anspruch 6, dadurch gekennzeichnet, daß die Menge der auf der Folie abgesetzten leitenden Pigmente zwischen 1 und 10 g/m2 Trockengewicht beträgt. Sheet according to Claim 6, characterized in that the amount of the said conductive pigments which is deposited on the sheet is between 1 and 10 g/m2, in dry weight.
- 8Abrasif flexible ayant des propriétés antistatiques caractérisé par le fait qu'il a pour support la feuille selon les revendications 1 à 7. Elastisches Schleifmittel mit antistatischen Eigenschaften, dadurch gekennzeichnet, daß es als Träger die Folie nach den Ansprüchen 1 bis 7 aufweist. Flexible abrasive having antistatic properties, characterized in that it has for support the sheet according to Claims 1 to 7.
- 9Decorative sheet, characterized in that it is obtained from a sheet according to Claims 1 to 7. Dekorationsfolie, dadurch gekennzeichnet, daß sie ausgehend von einer Folie nach den Ansprüchen 1 bis 7 erhalten wird. Feuille décorative caractérisée par le fait qu'elle est obtenue à partir d'une feuille selon les revendications 1 à 7.
- 10Laminate having antistatic properties, characterized in that it includes at least one sheet according to Claims 1 to 7 or 9. Schichtmaterial mit antistatischen Eigenschaften, dadurch gekennzeichnet, daß es mindestens eine Folie nach den Ansprüchen 1 bis 7 oder 9 aufweist. Stratifié ayant des propriétés antistatiques caractérisé par le fait qu'il comporte au moins une feuille selon les revendications 1 à 7 ou 9.
Independent claims10
41 paragraphs in 2 sections, as filed
The invention relates to a sheet of paper having antistatic properties.
Such a sheet can be used in various fields. It can be used to manufacture articles for which it is necessary to dissipate the electrostatic charges produced during their use or for articles which have as main or secondary function to dissipate the electrostatic charges which form and can be dangerous in a given environment. .
Flexible abrasives are known which consist of a support sheet on which abrasive grains are bonded with an adhesive for which it is necessary to dissipate the electrostatic charges created during their use. In fact, if the abrasive is not treated to dissipate the charges, the dust formed during the abrasion of an object is deposited and fouls the abrasive grains; it then reduces the abrasion yield. In addition, workers can be subjected to electric shocks which make them react with uncontrolled gestures putting them at risk during their work.
We also know the laminates that are commonly used for the manufacture of furniture, work tables, wall panels and others. The products obtained are used in particular in operating rooms, clean rooms or computer rooms. In these rooms it is necessary to avoid that the dust is retained in particular because of the attraction exerted by the electrostatic charges and it is also necessary to avoid sudden electrostatic discharges, it is therefore necessary that the surfaces being in the room are treated to dissipate regularly static electricity.
In the field of abrasives, the support or the adhesive layer or the surface of the abrasive grains are treated with a conductive product. As conductive products, quaternary ammonium salts, carbon black, metallic powders or fibers, metallic alloys, metallic salts, conductive doped polymers or inorganic pigments made conductive by coating them with an electrically conductive layer have been used. metal oxide.
It is known to use carbon black in bulk or on the surface to produce a conductive support.
In application EP-A-414494, the abrasive is made conductive by incorporating carbon black into the adhesive used to bond the abrasive grains.
In US-A-3942959, the abrasive is made conductive by means of a layer of a conductive compound which may be a metal, a metal alloy, a metallic pigment, a salt or a metal complex, this layer being placed between two insulating layers. The conductive product can be placed on the back of the support, on the face of the support (below the adhesive), mixed with the adhesive or even on the grains.
In application FR-A-2276144, an abrasive is made conductive by placing a conductive layer over the abrasive grains, the conductive product being in particular graphite.
In application EP-A-408943, the abrasive is made conductive by treating the surface of the layer containing the abrasive grains with a solution containing a quaternary ammonium salt.
In application EP-A-398580, the abrasive is made conductive by treating the surface of the layer containing the abrasive grains with a doped conjugated polymer such as, for example, polythiophene, polyaniline, polypyrrole.
In the field of laminates, the sheets of paper constituting them are treated with a conductive product. Let us first recall how laminates are generally produced by distinguishing the two types of laminates currently existing, the so-called high pressure laminates and the so-called low pressure laminates. The so-called high pressure laminates are produced from a core consisting of a stack of sheets, generally kraft paper, impregnated with a thermosetting resin, in particular a phenolic resin. Once the sheets of kraft paper impregnated with resin, they are dried, cut, then stacked on top of each other; the number of stacked sheets depends on the applications, it generally varies between three and nine. Then placed on the stack of sheets constituting the core, a decorative sheet that can be plain, with printed patterns or even presented an iridescent or metallic appearance and being impregnated with a thermosetting resin which does not blacken with heat (for example a resin melamine-formaldehyde). Sometimes a protective covering sheet, called "overlay", also impregnated with a resin, devoid of pattern and transparent in the final laminate, is placed above the decorative sheet. The stack of the various types of impregnated sheets is placed in a press provided with a sheet giving the surface appearance; the assembly is laminated under pressure and hot; an extremely hard unitary structure is obtained which has a decorative effect.
The so-called low pressure laminates are produced in a similar manner to that of the high pressure laminates, but the decorative sheet is laminated directly on a particle board or any other basic support.
There is a third type of product, the finished sheet, which also belongs to the category of decorative papers. This sheet of paper which is pre or post impregnated (generally a mixture of latex and melamine-formaldehyde resin) is intended to be glued to a particle board or any other support.
In application FR-A-2540041 a laminate is made conductive by the fact that a part of the sheets constituting the core is conductive by incorporation in each sheet of an electrically conductive material such as carbon black, a metal or salts metallic or conductive fibers.
In application FR-A-2557167, it is recommended to disperse conductive fibers in a paper to obtain a conductive laminate. These fibers are carbon fibers, metallic fibers or fibers covered with a metal.
In application JP-A-58034861, an antistatic agent for plastics is described as a conductive pigment obtained by depositing tin or indium on a non-conductive mineral base pigment followed by heating in an oxygen atmosphere to form their oxide. The metal oxide is therefore not doped.
As basic pigments which can be used, numerous pigments are mentioned without specifying any advantage linked to a particular pigment or to a geometric shape of a family of pigments.
In US-A-5071676 describes a conductive pigment usable for imparting antistatic properties to paper-cardboard. This pigment consists of a non-conductive substrate covered with an electroconductive layer of tin oxide doped with antimony, itself covered with a layer giving the pigment an isoelectric point between 5 and 9 in order to facilitate its dispersion. The substrate can be any, it is not critical for the invention.
EP-A-415478 describes a colored and conductive pigment usable in laminated papers. This pigment consists of a base pigment of rutile titanium dioxide and mixed phase coated with a layer of tin oxide doped with antimony. Rutile has a spherical geometric shape, so this pigment is spherical.
All these conductive products mentioned have various drawbacks.
The major drawback of carbon black is that you have to obtain black products, which can be awkward from an aesthetic point of view and which means that you cannot print these products as you wish. A disadvantage of certain products such as doped polymers is their high price. A disadvantage of certain products such as quaternary ammonium salts is that it gives the articles a conductivity too low to have a good flow of electrostatic charges. Another disadvantage of conductive salts is that the level of conductivity of the products containing them varies with relative humidity. A drawback of certain conductive products such as aluminum is the sensitivity to water; in the presence of water a dangerous release of hydrogen takes place. They cannot therefore be easily used in an aqueous medium. Drawbacks linked to the use of conductive fibers are, on the one hand, the mottled aesthetic appearance given to paper, in particular with carbon fibers, and on the other hand, the reduction in the physical characteristics of the paper sheet. Certain inorganic conductive pigments made conductive by a layer of metal oxide can give a conductivity which is too low to ensure good dissipation of electrostatic charges, especially once used in a paper application.
The plaintiff proposes to resolve the disadvantages mentioned.
The object of the invention is to provide a sheet of paper which has a sufficient level of electrical conductivity giving it antistatic properties. Those skilled in the art know from experience that, for an article to effectively dissipate electrostatic charges, it is preferable that its surface resistivity is not greater than about 10<sup>7</sup> ohms, measurement made according to ASTM 257-66.
A second aim is to provide a sheet having antistatic properties which can be produced entirely in an aqueous medium. A third object is to provide a sheet having antistatic properties which do not vary with the relative humidity. A fourth aim is to provide a sheet having antistatic properties which has a neutral aesthetic appearance, that is to say that the product which will make the sheet conductive must not or only slightly modify the appearance of the sheet. Another object is to provide a sheet having antistatic properties whose mechanical characteristics are good. Another object is to provide a sheet having antistatic properties which has a low cost price.
The Applicant has found that the aims of the invention are achieved by producing a sheet which comprises conductive pigments having a basic structure of the lamellar type and provided with an electroconductive layer of doped metal oxide.
As mentioned above, the mineral pigments covered with doped metal oxides are known for their electroconductive properties, however the Applicant has found that, for pigments having an electroconductive layer based on the same oxide and for the same dopant, therefore having a priori comparable intrinsic conductivity levels, the sheets of paper containing these pigments have very different final conductivities depending on the basic structure (geometric shape) of the support pigment of the layer. Such results are shown in the appended Table 1, the doped metal oxide chosen being tin oxide doped with antimony, this doped oxide is deposited on support pigments of different geometric shapes. The conductive pigments were coated in an aqueous medium under the same conditions using the same binder (polyvinyl alcohol PVA) and in the same 1: 1 ratio, on the surface of a sheet of paper. The surface resistivity of the sheets was measured according to standard ASTM 257-66 for a relative humidity of 50% (the conductivity of the sheets can be obtained by taking the inverse of the resistivity). From this study it seems that the basic structure of the pigment has an influence on the final conductivity of the sheet. The level of resistivity desirable for good dissipation of electrostatic charges (less than 10<sup>7</sup> ohms) is only achieved with pigments having a basic structure of the lamellar type (therefore of flat geometric shape); the resistivity is indeed of the order of 10<sup>5</sup> ohms.
The invention therefore provides a sheet of paper having antistatic properties characterized in that it comprises conductive pigments having a basic structure of the lamellar type and provided with at least one electroconductive layer of doped metal oxide.
Preferably the doped metal oxide is a tin oxide doped with antimony.
According to the invention, the pigments having a lamellar type structure can be chosen, for example, from micas, talc, kaolin, bentonites, montmorillionites or glass particles. In a particular case of the invention, the conductive pigment is a mica coated with a layer of tin oxide doped with antimony. The mica pigments covered with a layer of tin oxide doped with antimony have good light transparency, they do not modify the aesthetic appearance of the paper which contains them.
In another particular case of the invention, the conductive pigment is a mica covered with a layer of titanium oxide, optionally with a layer of silica, and coated with a layer of tin oxide doped with l 'antimony. These pigments have a certain iridescence but they have little effect on the aesthetic appearance of the paper comprising them. It may be advantageous to use them in areas where the decorative effect of iridescence is sought, for example in the area of laminates.
The conductive pigments can be incorporated en masse during the manufacture of the sheet on the paper machine or be deposited on the surface of the sheet by impregnation in a size press or by any coating means or even by printing. Preferably the conductive pigments are provided in an aqueous medium. The sheet is preferably characterized by the fact that it carries, on at least one face, a layer containing at least the said conductive pigments and at least one binder. The binder is a binder usually used in stationery such as water-soluble binders, latexes. It may be advantageous to use a water-soluble binder, such as, for example, polyvinyl alcohols or starches, to obtain an easily repulpable sheet. The layer may optionally contain other adjuvants commonly used in stationery such as viscosity regulating agents, for example carboxymethylcellulose, defoamers, etc. Preferably the amount of conductive pigments deposited on the surface of the sheet is between 1 and 10 g / m<sup>2</sup>, by dry weight.
The treated sheet is based on cellulose fibers, it can include other organic fibers (polyethylene, polypropylene, polyester fibers, etc.) or mineral fibers such as glass fibers. It can also include other additives used in stationery such as fillers, bonding agents, binders, wet strength agents, retention agents, anti-foaming agents, viscosity regulating agents, regulating agents. pH etc ....
The invention also provides a flexible abrasive product having antistatic properties which is characterized by the fact that it is supported by said sheet with antistatic properties. The abrasive can obviously be in the form of a sheet but also in other forms such as, for example, continuous tape, disc, etc. Preferably, the sheet used contains the conductive pigments on the surface. The conductive pigments can be on the back of the abrasive or on the face carrying the grains, below the adhesive. Since it is known to use a conductive product in the adhesive or on the grains, one can envisage such a use of conductive pigments.
The invention also relates to a decorative sheet obtained from said sheet with antistatic properties. The invention also relates to a laminate having antistatic properties which is characterized in that it comprises at least one sheet like the said sheet with antistatic properties. Said sheet can be used as a component of the core of the laminate or as a decorative sheet or possibly as an overlay. Said sheet can also be a finished sheet.
The following examples show possible embodiments of a sheet according to the invention; they also show that the surface resistivity (thus the conductivity) does not vary or very little with the relative humidity.
EXAMPLE 1
:
An aqueous composition of mica-type conductive pigments coated with antimony-doped tin oxide, sold by MERCK, and starch, is coated on a sheet of paper with a MEYER bar. binder. The pigment-binder ratio is 5: 1. On another sheet, a similar composition is coated, but the binder is a PVA. Samples are produced with different layer weights of conductive pigments (expressed in dry weight in the table below). The surface resistivity of each sample is measured according to standard ASTM 257-66 and this at relative humidity levels (denoted RH) of 50 and 20%. The results in the table below show that the resistivity of the sheet does not vary with the relative humidity.
The color of the sheets of paper obtained according to the invention is not changed. <tables id="tabl0001" num="0001"><table frame="all"><tgroup cols="6" colsep="1" rowsep="1"><colspec colnum="1" colname="col1" colwidth="26.25mm" /><colspec colnum="2" colname="col2" colwidth="26.25mm" /><colspec colnum="3" colname="col3" colwidth="26.25mm" /><colspec colnum="4" colname="col4" colwidth="26.25mm" /><colspec colnum="5" colname="col5" colwidth="26.25mm" /><colspec colnum="6" colname="col6" colwidth="26.25mm" /><thead valign="top"><row><entry namest="col1" nameend="col1" align="center">BINDER</entry><entry namest="col2" nameend="col4" align="center">STARCH</entry><entry namest="col5" nameend="col6" align="center">PVA</entry></row></thead><tbody valign="top"><row><entry namest="col1" nameend="col1" align="left">LAYER WEIGHT in pigments (g / m2)</entry><entry namest="col2" nameend="col2" align="center">6,0</entry><entry namest="col3" nameend="col3" align="center">4,6</entry><entry namest="col4" nameend="col4" align="center">2,2</entry><entry namest="col5" nameend="col5" align="center">5,7</entry><entry namest="col6" nameend="col6" align="center">2,75</entry></row><row><entry namest="col1" nameend="col1" align="left">Surface resistivity at 50% RH (ohm)</entry><entry namest="col2" nameend="col2" align="center">1,2.10<sup>5</sup></entry><entry namest="col3" nameend="col3" align="center">5,1.10<sup>5</sup></entry><entry namest="col4" nameend="col4" align="center">6,3.10<sup>5</sup></entry><entry namest="col5" nameend="col5" align="center">2.10<sup>5</sup></entry><entry namest="col6" nameend="col6" align="center">3,6.10<sup>5</sup></entry></row><row rowsep="1"><entry namest="col1" nameend="col1" align="left">Surface resistivity at 20% RH (ohm)</entry><entry namest="col2" nameend="col2" align="center">1,6.10<sup>5</sup></entry><entry namest="col3" nameend="col3" align="center">3,8.10<sup>5</sup></entry><entry namest="col4" nameend="col4" align="center">6,7.10<sup>5</sup></entry><entry namest="col5" nameend="col5" align="center">2.10<sup>5</sup></entry><entry namest="col6" nameend="col6" align="center">3,7.10<sup>5</sup></entry></row></tbody></tgroup></table></tables>
EXAMPLE 2
:
Samples are produced as in Example 1 but a conductive pigment is used a mica covered with a layer of titanium oxide then with a layer of silica and finally coated with a layer of tin oxide doped with antimony, the tin / antimony ratio being 85:15. This pigment is marketed by MERCK. According to the results in the table below, it can be seen that the relative humidity has no influence on the level of conductivity of the sheets obtained according to the invention. The leaves have a slight iridescence which has little effect on their aesthetic appearance. <tables id="tabl0002" num="0002"><table frame="all"><tgroup cols="6" colsep="1" rowsep="1"><colspec colnum="1" colname="col1" colwidth="26.25mm" /><colspec colnum="2" colname="col2" colwidth="26.25mm" /><colspec colnum="3" colname="col3" colwidth="26.25mm" /><colspec colnum="4" colname="col4" colwidth="26.25mm" /><colspec colnum="5" colname="col5" colwidth="26.25mm" /><colspec colnum="6" colname="col6" colwidth="26.25mm" /><thead valign="top"><row><entry namest="col1" nameend="col1" align="center">BINDER</entry><entry namest="col2" nameend="col4" align="center">STARCH</entry><entry namest="col5" nameend="col6" align="center">PVA</entry></row></thead><tbody valign="top"><row><entry namest="col1" nameend="col1" align="left">LAYER WEIGHT in pigments (g / m2)</entry><entry namest="col2" nameend="col2" align="center">6,0</entry><entry namest="col3" nameend="col3" align="center">4,1</entry><entry namest="col4" nameend="col4" align="center">1,9</entry><entry namest="col5" nameend="col5" align="center">7,4</entry><entry namest="col6" nameend="col6" align="center">5,0</entry></row><row><entry namest="col1" nameend="col1" align="left">Surface resistivity at 50% RH (ohm)</entry><entry namest="col2" nameend="col2" align="center">0,9.10<sup>5</sup></entry><entry namest="col3" nameend="col3" align="center">2,6.10<sup>5</sup></entry><entry namest="col4" nameend="col4" align="center">12.10<sup>5</sup></entry><entry namest="col5" nameend="col5" align="center">6.10<sup>4</sup></entry><entry namest="col6" nameend="col6" align="center">1,3.10<sup>5</sup></entry></row><row rowsep="1"><entry namest="col1" nameend="col1" align="left">Surface resistivity at 20% RH (ohm)</entry><entry namest="col2" nameend="col2" align="center">0,8.10<sup>5</sup></entry><entry namest="col3" nameend="col3" align="center">2,6.10<sup>5</sup></entry><entry namest="col4" nameend="col4" align="center">15.10<sup>5</sup></entry><entry namest="col5" nameend="col5" align="center">9.10<sup>4</sup></entry><entry namest="col6" nameend="col6" align="center">2,0.10<sup>5</sup></entry></row></tbody></tgroup></table></tables><tables id="tabl0003" num="0003"><img file="EP0633964B1_D0001.tif" /></tables>
Contents2
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| Document | Relation | Office |
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| EP0415478A | Cites | European Patent Office (EPO) |
| US5071676A | Cites | United States of America |
| DATABASE WPIL Section Ch, Week 8314, Derwent Publications Ltd., London, GB; Class G08, AN 83-33627K | Non-patent | – |
21 members in 13 offices
Priority claims9
| Document | Office | Kind | Date |
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| 9204230 | France | A | |
| 9204230 | France | A | |
| 9204230 | France | – | |
| 9300310 | France | W | |
| 9300310 | France | W | |
| 9204230 | – | – | – |
| FR19920004230 | – | – | – |
| FR9300310 | – | – | – |
| WO1993FR00310 | – | – | – |
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| NO943756L | Norway | L | |
| FR2689531B1 | France | B1 | |
| EP0633964A1 | European Patent Office (EPO) | A1 | |
| AU661902B2 | Australia | B2 | |
| US5677039A | United States of America | A | |
| EP0633964B1This record | European Patent Office (EPO) | B1 | |
| AT162250T | Austria | T | |
| ATE162250T1 | Austria | T1 | |
| NO302248B1 | Norway | B1 | |
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| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| Change of name or company nameCD | CD | FR | |
| Change in legal formCJ | CJ | FR | |
| European patent in force as of 2002-01-01IF02 | IF02 | GB | |
| No opposition filedOpposition26N | 26N | EP | |
| No opposition filed within time limitOppositionORIGINAL CODE: 0009261PLBE | PLBE | EP | |
| Information on the status of an ep patent application or granted ep patentGrantedSTATUS: NO OPPOSITION FILED WITHIN TIME LIMITSTAA | STAA | EP | |
| Patent ceasedCeasedPL | PL | CH | |
| Ep patent with danish claimsT3 | T3 | DK | |
| Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents actLapsedNLV1 | NLV1 | EP | |
| European patents granted designating irelandGranted78345FG4D | FG4D | IE | |
| Translation is availableAVAILABILITY OF NATIONAL TRANSLATIONSC4A | SC4A | PT | |
| Nl: modifications (of names), taken from the european patent patent bulletinNLT2 | NLT2 | EP | |
| Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25 | PG25 | EP | |
| Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25 | PG25 | EP | |
| Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25 | PG25 | EP | |
| Definitive protectionFG2A | FG2A | ES | |
| Party data changed (patent owner data changed or rights of a patent transferred)RAP2 | RAP2 | EP | |
| Gb: translation of ep patent filed (gb section 77(6)(a)/1977)GBT | GBT | EP | |
| Corresponds to:REF | REF | EP | |
| It: translation for a ep patent filedITF | ITF | EP | |
| It: translation for a ep patent filedITF | ITF | EP | |
| European patent takes effect as a national patent in ch/liEP | EP | CH | |
| Designated contracting statesAK | AK | EP | |
| Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25 | PG25 | EP | |
| Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25 | PG25 | EP | |
| Corresponds to:REF | REF | EP | |
| (expected) grantORIGINAL CODE: 0009210GRAA | GRAA | EP | |
| Despatch of communication of intention to grant a patentORIGINAL CODE: EPIDOS IGRAGRAH | GRAH | EP | |
| First examination report despatched17Q | 17Q | EP | |
| Despatch of communication of intention to grant a patentORIGINAL CODE: EPIDOS IGRAGRAH | GRAH | EP | |
| Despatch of communication of intention to grantORIGINAL CODE: EPIDOS AGRAGRAG | GRAG | EP | |
| Party data changed (applicant data changed or rights of an application transferred)RAP1 | RAP1 | EP | |
| Request for examination filed17P | 17P | EP | |
| Designated contracting statesAK | AK | EP | |
| Public reference made under article 153(3) epc to a published international application that has entered the european phaseORIGINAL CODE: 0009012PUAI | PUAI | EP |
Numbers
- Publication
- 0633964
- Publication, DOCDB
- 0633964
- Publication, EPODOC
- EP0633964
- Application
- 93907902
- Application, DOCDB
- 93907902
- Application, EPODOC
- EP19930907902
Titles3
- German
- ANTISTATISCHE FOLIE
- English
- ANTISTATIC SHEET
- French
- FEUILLE ANTISTATIQUE
Classification
- CPC, 6
- H01B1/20
- D21H19/38
- D21H21/14
- Y10T428/24901
- Y10T428/24884
- Y10T428/31993
- IPC, 3
- D21H19 38
- D21H21 14
- H01B1 20
Designated states16
- Contracting states, 16
- Austria
- Belgium
- Switzerland
- Germany
- Denmark
- Spain
- France
- United Kingdom
- Greece
- Ireland
- Italy
- Liechtenstein
- Luxembourg
- Netherlands (Kingdom of the)
- Portugal
- Sweden