DE2425186A1 - SELF-ADHESIVE ARTICLE WITH A SILICONE ADHESIVE AND A REMOVABLE ANTI-GLOSSARY COATING AND METHOD OF APPLICATION - Google Patents

Description

1 River Road
SCHENECTADY, NY / USA

Self-adhesive article with a silicone adhesive and a peelable anti-stick layer and method for its application

The present invention relates to articles comprising a base which is coated with a self-adhesive silicone and has a removable anti-adhesive layer on the adhesive and which The invention also relates to a method of using such an article.

Organopolysiloxane compositions have wide application as Self-adhesive found. Are the various silicone resins and rubbers mixed with one another, reacted or condensed, and Applied to suitable substrates or base layers, self-adhesive (in English as "pressure-sensitive adhesive ") Article. These adhesives can be

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rides that they can be used over a wide temperature range are, for example, from -50 to about 25O C and they remain above this range their stickiness and cohesiveness and show only a low sensitivity to moisture. In addition, have self-adhesive organopolysiloxanes excellent electrical properties. Finally, the self-adhesive organopolysiloxanes have also have excellent adhesive properties with respect to a wide variety of substrates. They are suitable for many substrates, to which self-adhesive adhesives that were not based on silicone showed little or no affinity, like e.g. towards Teflon_substraten.

Such articles with a self-adhesive layer require protection of the surface of that layer from contamination and sticking or sticking to undesirable surfaces between the preparation and the intended application. Furthermore, if such an article is to be used in the form of a tape and rolled up in rolls, then the base of one layer will necessarily come into contact with the coating of self-adhesive on the layer above. This contact often causes the top layer to adhere to the next layer underneath and makes it extremely difficult to unwind the tape because the self-adhesive organopolysiloxane is very tacky.

For these reasons, it is necessary to have a peelable protective film to use on the self-adhesive.

One of the best known peelable layers is a hardened one Composition based on a silanol-terminated dimethylpolysiloxane liquid, e.g. that under the name SS-4191 sold by General Electric Co. This composition you put on a peel-off paper film, which then is placed on the self-adhesive fabric.

With common adhesives, e.g. one based on silanol end groups based on dimethyl rubber, the peel strength between the adhesive and the release liner is so great that

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that the paper foil often tears when peeled off. The peel strength immediately after collapsing is tall and on the order of about 300 g / cm (equivalent to 25 ounces / inch).

In the invention it has now been found that when using a special type of adhesive, namely one in which the rubber component differs from the known above-mentioned adhesive in that it uses at least one copolymer rubber, of the diphenylsiloxane units and particularly preferably methylvinylsiloxane units and contains chain-terminating vinyl groups, a large decrease in peel strength between that with a Silanol-terminated dimethylpolysiloxane liquid coated Release paper and the adhesive-coated base. This peel strength is on the order of about 50 g / cm (corresponding to 4 ounces / inch) and this will cause the Paper avoided. This easy peelability is also after a Maintain accelerated oven aging and the subsequent adhesion of such tapes, e.g. after application to stainless steel test plates Steel, is excellent even after long oven aging times.

In accordance with the present invention, articles are provided which have a consistent coherent basis based on at least one side has a self-adhesive organopolysiloxane and a peelable anti-adhesive layer comprising a film, which is coated with a dimethylpolysiloxane liquid containing silanol end groups, on the self-adhesive organopolysiloxane carries, the self-adhesive agent being the intercondensation product a mixture comprising an organopolysoxane resin and at least one alkylarylpolysiloxane rubber.

The inventive method for gluing a with a self-adhesive Organopolysiloxane coated article on a substrate comprises the following stages:

(a) Making an article that includes a base that is at least on one side there is a self-adhesive organopolysxloxan

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has as well as a peelable anti-adhesive layer which comprises a film, the silanol-terminated dimethylpolysiloxane liquid is coated on the self-adhesive organopolysiloxane carries, the self-adhesive agent being the intercondensation product a mixture comprising an organopolysiloxane resin and at least one alkylarylpolysiloxane rubber,

(b) Separating the peelable anti-adhesive layer from the self-adhesive one Organopolysiloxane and

(c) Application of the self-adhesive organopolysiloxane containing Article on a substrate.

The anti-stick peelable layer may comprise a film coated with a silanol-terminated dimethylpolysiloxane liquid is coated, whereby the film forms a uniformly coherent base made of a natural substance, such as fabric or paper.

The film is coated on the side to be facing the adhesive with a linear dimethylpolysiloxane liquid containing silicon-bonded hydroxyl terminal groups and preferably has a viscosity of from 1000 to 10,000,000 centipoise at 25 ⁰ C. Suitable materials are those of the formula

HO - (- SiO-H— ^H '

V ⁷

where ρ is an integer varying from 300 to 5260. Particularly preferred is a linear diorganopolysiloxane with a viscosity of 12,000 to 90,000, in which the value of ρ between 770 and 1350 varied. In the most preferred embodiment, the linear diorganopolysiloxane has a viscosity of 15 up to 35,000 centipoise corresponding to a value> £ that between 825 and 1100 varies.

The dimethylpolysiloxane liquids can be produced by one of the known processes. Such a procedure

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includes the hydrolysis of methyl substituted dichlorosilanes to give a crude hydrolyzate containing a mixture of linear and cyclic polysiloxanes. The crude hydrolyzate is then treated with a suitable catalyst, such as KOH, and thereby depolymerized to form a mixture of low-boiling, low molecular weight cyclic polymers, undesired materials such as monofunctional and trifunctional chlorosilane starting materials being obtained as by-products. The composition obtained is fractionally distilled and a pure one is obtained. Product _x which contains the low-boiling, low-molecular-weight cyclic polymers free from significant amounts of monofunctional and trifunctional groups.

High molecular weight dimethylpolysiloxanes which have a viscosity of 5 x 10 centipoise and more at 25 ° C can be treated with water to give low molecular weight diorganopolysiloxanes having a viscosity of 1,000 to 90,000 centipoise at 25 ° C. This can be accomplished by blowing steam over the surface of the high molecular weight product or through the polymer for a time sufficient to obtain the low molecular weight product with the desired silanol content. Therefore, if it is desired to obtain low molecular weight diorganopolysiloxanes from the high molecular weight diorganopolysiloxanes by the above water treatment, which is known to those skilled in the art, then the number of diorganosiloxy units can be from above 5260 to a value in the vicinity decrease from 300. The application of steam in this way leads to a reduction in the viscosity of the polymer, at the same time the linear polysiloxane formed has hydroxyl groups bonded to terminal silicon atoms.

The diorganopolysiloxanes low molecular weight on the other hand from the high-molecular diorganopolysiloxane by adding water to the latter and heating the mixture to elevated temperatures of 15O to 170 ⁰ C, the long chain polymers into shorter chains break, are prepared. The amount of water used depends on such factors

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such as the molecular weight of the treated polymer, the time and the temperature to which the mixture of high molecular weight diorganopoilysiloxanes is heated, and the desired viscosity. These conditions can easily be determined. For example, a high molecular weight diorganopolysiloxane having a viscosity of 2 000 000 centipoise at 25 ° C with 0.5 wt -.% Water are heated to 150 C for 2 hours and obtain a low molecular weight diorganopolysiloxane having a viscosity of 2000 centipoise. Preferably, the low molecular weight organopolysiloxane is prepared so that ea has a viscosity of 12,000 to 90,000 centipoise at 25 ° C.

The self-adhesive used in the present invention Adhesive is an organopolysiloxane composition with self-adhesive properties. This in the context of the present invention Self-adhesive organopolysiloxane used is mainly made from Organopolysiloxane obtained and does not contain the organopolysiloxane only in smaller quantities. As is known, self-adhesive organopolysiloxane compositions usually by reaction between certain organopolysiloxane resins and essentially linear organopolysiloxane rubbers obtain.

the to

The organopolysiloxane rubbers used for the production of / self-adhesive silicones / can include a single species as well as a plurality of species.

The rubbers have a viscosity of about 200,000 to 15,000 centipoise and contain an average of 1.85 to .2.01 silicon-bonded alkyl and aryl groups per silicon atom, the alkyl and aryl groups being selected from alkyl groups having 1 to 8 carbon atoms , Cycloalkyl radicals with 5 to 7 carbon atoms in the ring, lower alkenyl radicals with 2 to 8 carbon atoms, eiruclear aryl radicals, lower alkyl-substituted mononuclear aryl radicals with 1 to 6 carbon atoms in the alkyl group and halogenated derivatives of the above radicals, the organic radicals via silicon Carbon bonds are bonded to the silicon and in the rubber there are about 2 to about 75 percent aryl-silicon bonds of the total number of organic radicals bonded to silicon

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and about 0.001 to 0.25 wt -.% silicon-bonded hydroxyl or alkoxy groups are present.

Generally speaking, these chews mainly comprise diorganosiloxane units, however, they can also contain small amounts of monoorganosiloxane units and triorganosiloxane units. A particularly useful type of organopolysiloxane rubber is the linear one Polymer of the following formula

R.

R ¹ Of - Si-O 4 R ¹

Vi / T

^R.

wherein R is selected from monovalent hydrocarbon radicals, halogen-substituted monovalent hydrocarbon radicals and cycloalkyl radicals and η has a value of at least 500, e.g. about 5000 to 500,000 or more and R is selected from hydrogen, Alkyl and vinyl. The organopolysiloxane in the context of the above formula can have a large number of molecules of different molecular weights and different R and R substituents as long as the average formula of the reaction mixture is within the limits the above formula falls.

In addition to the linear ones containing silanol or alkoxy end groups Diorganopolysiloxanes of the formula above, the rubber may also contain some molecules that are linear diorgahosiloxane chains which are terminated at one end with triorganosiloxane units of the following formula:

the other end of the chains through alkoxy or silanol groups is ended, where R has the above meaning. The polymer chains can also contain some molecules, the monoorganosiloxane units of the following formula:

^RSio i, 5 409851/1005

wherein "R is as defined above. In any event, the organopolysiloxane rubbers generally have a viscosity in the range of about 200,000 to 15,000,000 centipoise as noted above, and preferably a viscosity in the range of about 500,000 to 12,000 centipoise, where the amount of silicon-bonded hydroxyl and / or alkoxy groups, at least from 0.001 to 0.25 wt -.%

sufficient and preferably in the range of about 0.005 to 0.1 wt -.% is. The various organopolysiloxane rubbers are known and their preparation need not be described in the context of the present invention.

Exemplary of the radicals that represent R in the organopolysiloxane rubbers can occur are, for example, alkyl radicals such as methyl, ethyl, propyl, butyl, octyl, etc., aryl radicals such as phenyl, naphthyl, tolyl etc., aralkyl radicals such as benzyl, phenylethyl etc., alkenyl radicals such as vinyl, allyl etc., cycloaliphatic hydrocarbon radicals, such as cyclohexyl, cycloheptyl, cyclohexenyl, etc., various halogenated monovalent hydrocarbon residues, such as Chlorine thy I, alpha-chloroethyl, beta-chloroethyl, chlorophenyl, dibromophenyl, trifluoromethylphenyl, Trifluoromethylpropyl, etc., as well as cyanoalkyl radicals, e.g. cyanomethyl, beta-cyanoethyl, beta-cyanopropyl, gamma-cyanopropyl, omega cyanobutyl, etc.

The preferred organic radicals for R in the organopolysiloxane rubbers, which are used in the context of the present invention are phenyl, methyl, vinyl and mixtures thereof.

In the organopolysiloxane rubbers of the above formula, R can be hydrogen or an alkyl group such as methyl, ethyl, propyl, t-butyl, octyl, hexyl and stearyl or an alkenyl group such as

1
Vinyl. Preferably R is hydrogen.

It is essential to the invention that the organopolysiloxane rubber ingredient Aryl contains e.g. phenyl groups in order to achieve optimal self-adhesive properties. If e.g. a mixture is used from phenyl and methyl groups, then the number of silicon-bonded phenyl groups in such

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The range is kept ₃ that for every 2 to 75 phenyl groups bonded directly by carbon-silicon bonds there are 98 to 25 methyl groups bonded to silicon. For example, a preferred range is from about 5 to about 15 phenyl groups per 95 to 85 methyl groups.

The term "organopolysiloxane resin" in the context of the present The invention is intended to encompass polymers which contain two or more siloxane units and have the following average formula:

(OH) (OR ² ) _r R ² _s Si0 _ _s

wherein R is selected from alkyl radicals having 1 to 8 carbon atoms, Cycloalkyl radicals with 5 to 7 carbon atoms in the ring, lower Alkeny! Residues with 2 to 8 carbon atoms, mononuclear aryl residues, lower alkyl-substituted mononuclear aryl radicals with 1 to 6 carbon atoms in the alkyl group and halogenated derivatives of the above radicals, OR is a lower alkoxy group containing 1 to 8 carbon atoms per remainder, s has a value from 1 to 1.7 and preferably a value from 1.05 to 1.45, q has a value from 0 to 1 and preferably has a value of 0.2 to 0.55, r has a value of 0 to 1 and preferably a value of 0.2 to 0.55, and the Sum of q and r has a value from 0.01 to. 1.0 and preferably has a value of 0.2 to 0.55.

Examples of the siloxane units used in the organopolysxloxane resins may be present are the following: '.

. (CH ₃ ) ₂ SiO, (CH ₃ ) C ₆ H ₅ SiO, C ₂ H ₅ SiO ₃₇₂ , (C ₂ H ₅ J ₂ SiO, (C ₂ H ₅ ) C ₆ H ₅ SiO, C ₃ H ₇ SIO ₃₇₂ ; (C ₃ H ₇ J ₂ SiO, (CH JC ₆ H ₅ SiO, CH ₂ = CHSiO ₃₇₂ , (CH ₂ = CH) CH SiO, CH ₂ = CHCH ₂ SiO ₇₂ , (CF CH ₂ CH ₂ ) CH SiO,. ClCH ₂ CH ^C 6 ^H ll ^SiO 3/2> ^C1 2 ^C 6 ^H 3 ^SiO 3/2> · ^CP ₃ ^C 6 ^H 4 ^SiO 3/2 '(CgH JCF ₃ CH ₂ CH ₂ SiO, CH ₃ C ₆ H ₄ SiO ₃₇₂ and CgH ₅

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- ίο -

2
In particular, R is selected from lower alkyl radicals, such as methyl, ethyl, propyl, butyl and octyl; Cycloalkyl radicals having 5 to 7 carbon atoms in the ring, such as cyclopentyl, cyclohexyl and cycloheptyl; lower alkenyl groups such as vinyl and allyl; mononuclear aryl radicals, such as phenyl, tolyl and xylyl, lower alkyl-substituted mononuclear aryl radicals, such as benzyl and phenylethyl and the halogenated derivatives of the above radicals, for example chloromethyl, beta-chloroethyl, chlorophenyl, dibromophenyl and trifluoromethylethyl. Preferably

ο
R is selected from methyl, ethyl and phenyl.

2
The lower alkoxy radical OR is selected from lower alkoxy radicals having 1 to 8 carbon atoms, such as methoxy, ethoxy, propoxy and isopropoxy, which at the same time represent the preferred embodiments for this radical.

2 The ratio of the organic substituents R to the silicon atoms in the above-described siloxane resin is in the range from 1.0: 1 to 1.7: 1, and preferably in the range from 1.05: 1 to 1.45: 1 ..

Additionally, the resin should be at least 0.25 wt -.% Contains silicon-bonded OH groups and / or (OR) groups. The resin may have a much higher percentage of OH groups, and it may be at least 5 wt -.% OH groups. The lower alkoxy groups (OR) have up to 8 carbon atoms in the alkyl group and they can be, for example, methoxy, ethoxy and isopropoxy groups.

It has been found beneficial to be about 0.5 to about 6 parts by weight of the organopolysiloxane rubber per part by weight of the organopolysiloxane resin to use. In the context of the present invention, preference is given to about 1 to about 3 parts by weight of the organopolysiloxane rubber -per part by weight of the organopolysiloxane resin used.

The preparation of some particularly advantageous self-adhesive organopolysiloxanes is described in US Pat. No. 2,857,357. In the

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- ii -

The organopolysiloxane resins used in this PS are cohydrolysis products of a hydrolyzable trialkylsilane of the general formula R, SiX and an alkyl silicate of general formula 1 (RrO K Si. The molar ratio of the silicate to the hydrolyzable trialkylsilane is in the range from 1: 1 to 2: 1 and preferably in the range from about 1.2: 1 to 1.8: 1. X in the above formula des hydrolyzable silane is a hydrolyzable group such as halogen (e.g. chlorine, bromine, fluorine etc.), an alkoxy group (e.g. methoxy, ethoxy etc.) or an acyloxy group etc.

R in the above formulas is a lower alkyl group of 1 to 4 Carbon atoms. Examples of such lower alkyl radicals are methyl, ethyl, propyl, isopropyl, butyl and isobutyl.

The self-adhesive organopolysiloxane is usually available in film thicknesses of about 0.02 to. about 0.1 mm (corresponding to 0.7 to 4 mils) and preferably from about 0.025 to about 0.075 mm (corresponding to 1 to 3 mils). Of course, others can do the same Film thicknesses depending on the intended application of the self-adhesive Article can be used.

The uniformly coherent base part or the base to which the self-adhesive organopolysiloxane is applied can can be selected from a variety of bases depending on the intended application of the article. The self-adhesive article may be an adhesive tape in the form of a coiled roll, a film, or any other desired configuration.

The base or base can be made of any material suitable for carrying the self-adhesive adhesive. Examples of such suitable base materials are glass fabric, silicone-coated glass fabric, synthetic polymeric films, such as polyimides, polyamides, silicones, polytetrafluoroethylene and polychlorotrifluoroethylene, polyethylene, polypropylene, copolymers of acrylonitrile, butadiene and styrene, polyesters such as polyethylene terephthalate, and metalpolymers are furthermore Aluminum foil and copper foil as well as polymer-coated papers, such as polyethylene-coated papers, use _{8 5 1} / j _{0 0} 5

The articles according to the invention can be produced by mixing the organopolysiloxane resin with the organopolysiloxane rubber and cocondensing or reacting the two with one another at elevated temperatures. In general, the resin and the rubber are reacted with one another at temperatures between about 100 and about 150 ° C. for 1/2 to 6 hours until a product of the desired tack and cohesive strength is obtained. _S are after the rubber and resin have been reacted together, the product can be an aromatic solvent such as benzene, toluene or xylene, dissolved to form a solution having from about 2000 to 200,000 centipoise. In general, the solutions contain a solids content of about HO to about 70% by weight .

The solution can then be applied to any desired documentation material in any suitable conventional manner such as brushing, spraying, coating using a knife and similar. The organic solvent is then evaporated and a film of self-adhesive adhesive forms on the base material.

It may be desirable to include a free radical generating peroxide catalyst in the composition to render the pressure-sensitive adhesive thermosetting, which increases the adhesive properties at elevated temperatures. Is a peroxide in the solution of the self-adhesive organopolysiloxane present, then the film after the evaporation of the solvent is further erhi.tzt to temperatures of about 150 to about 250 ⁰ C. Some suitable organic peroxide catalysts include benzoyl peroxide and dicumyl peroxide.

The peelable anti-adhesive layer made from a silanol liquid coated film, e.g. a paper film or a material that is suitable for the base materials described above, can be applied to the self-adhesive organopolysiloxane. The self-adhesive organopolysiloxane adheres to the coated anti-adhesive layer in an easily detachable manner. This layer protects the surface of the organopolysiloxane from contamination and from sticking to undesired substrates until this layer

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later removed before use. This can be done by careful Peel off without damaging the adhesive. The release film is adhered to by the self-adhesive adhesive without leaving behind removed from remnants of the film on the adhesive, and the article is then pressed against the surface to which it is intended to adhere.

The invention is explained in more detail below with the aid of examples, in which the quantities are given by weight, unless otherwise stated.

example 1

Adhesive tapes were made according to the present invention, by placing a polythene about 0.075 mm (3 mils) thick

s e iu st -

lenterephthalate tape coated with an adhesive siloxane composition, which comprised the following components:

A. 50 parts of resin solids of a resin copolymer based on 1 mole of SiO ₂ reacted with 0.5 to 0.6 moles of (CH ₃ ) SiO 8 ii

B. 38 parts of a silanol-terminated polysiloxane copolymer rubber, the 5.3 MoI-? Diphenylsiloxane and 94.7 MoI-? Dimethylsiloxane wherein the polymer had a viscosity greater than 10,000,000 centipoise and

C. 12 parts of a copolymer rubber with 0.2 mol? Methylvinylsiloxane, 5.3 mol / 1/2 "diphenylsiloxane and 94.5 mol-? Dimethylsiloxane having a viscosity greater than 10,000,000 centipoise.

Ingredients A, B and C were prepared as a solution in xylene at 55% solids. A primary organic amine was used in an amount of 10 to 20 ppm "based on total solids" to make the above mixture at the reflux temperature (145 to 155 C) for a time of 1/2 to 6 hours About 1 part of benzoyl peroxide was added per 100 parts of silicone solids.

The xylene solution was applied to the base material by coating using a kettle. The coated article is then heated for 2 minutes to 90 b.is 95 ⁰ C, to evaporate the solvent and then was heated for 5 minutes on 150 175 ° C in a forced air oven to effect the reaction with the

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To cause benzoyl peroxide. The self-adhesive coating had a thickness of about 0.025 mm (equivalent to 1 mil).

A sheet of paper finished with a Sxlanol-terminated dime thy Ip olysiloxane liquid (General Electric SS-4191) coated was placed on the coated tape using a 4.5 kg (10 U.S. pound) roller. the Peel strength between the adhesive and the peelable sheet was then measured with a Scott tester with two grips. The separation of the "release sheet a" was started by hand and then the part with the adhesive and the polyester base attached to one clamp and the release sheet to the other clamp. the upper clamp was attached to a scale showing force and the lower clamp was attached to a mechanism which moved away from the upper clamp at a rate of exactly 30 cm (equivalent to 12 inches) per minute. The peel strength the adhesive from the release sheet was only about 50 g / cm (equivalent to 4 ounces / inch). It follows that the 'peelable Sheet can be easily removed from the adhesive.

The article coated with the self-adhesive adhesive was after • removing the release sheet on the peel strength of one Stainless steel plate tested according to ASTM Standard D-1000. This test is similar to that described above, with the Steel plate is attached to one of the clamps of the Scott tester. The peel values remained even during two weeks of oven aging high and ranged between about 400 and 470 g / cm (32 and 38 ounces / inch, respectively).

In addition, the protected with a peelable layer tapes had (P corresponding to 140 ^0), which were prepared according to the present invention, after two weeks of oven aging at 60 ⁰ C, upon peeling for the application of only a peel strength of about 50 g / cm (corresponding to 4 Ounces / inch) when applying a pressure of about 0.0175 kg / cm ² (equivalent to 0.25 US pounds / inch ² ).

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Comparative example 1

For comparison purposes, the procedure of Example 1 was repeated, but instead of the alkylaryl rubber-containing one used there The adhesive used an adhesive comprising a silanol-terminated methyl rubber. The peel strength after coating with the release sheet was greater than about 300 g / cm (equivalent to 25 ounces / inch) and the paper tore constant when trying to peel it from the adhesive coated base.

Example 2

The procedure of Example 1 was repeated, but using the following adhesive:

A. 50 parts of resin particles of a resin copolymer based on 1 mole of SiO ₂ reacted with 0.5 to 0.6 moles (CEL), SiO _1/2 ,

B. 40 parts of polysiloxane copolymer containing end groups of silanols 5.3 MoI-Ji diphenylsiloxane and 94.7 mol /? Dimethylsiloxane, where the copolymer has a viscosity greater than 10,000,000 centipoise and

C. 10 parts of the following mixture:

(i) 72 parts of a polymer with 0.2 mol / l methylvinylsiloxane, 5.3 MoI-Ji diphenylsiloxane and 94.5 mol /? Dimethylsiloxane, the original viscosity being greater than 10,000,000 centipoise,

(ii) 18 parts of fumed silica with a surface area of more than 250 m / g,

(iii) 8.5 parts of a processing aid consisting of 30 MoI-J? Diphenylsiloxane and 70 MoI-J? Composed of dimethylsiloxane and has a viscosity of 30 to 60 centipoise and

(iv) 2.5 parts octamethylcyclotetrasiloxane.

Ingredients A, B and C above were made into a solution in xylene at 60 % total solids. An alkali catalyst such as NaOH was used in an amount of 10 to 25 ppm based on total solution weight at reflux temperatures of 145 to 155 ° C used to form a copolymer of the resin and

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to effect the rubbers in a time of 1/2 to 6 hours. An adhesive tape was obtained from which the release liner could be easily removed without tearing.

From the above examples it can be seen that the present Invention self-adhesive organopolysiloxanes are created that can be protected against contamination without premature Plague sticking takes place. In addition, the protective layer can easily be removed if desired, along with the adhesive to use the correct base material. From the data of Comparative Example 1 it can also be seen that the use an adhesive outside the scope of the present invention that does not contain an alkylarylpolysiloxane rubber component, does not result in an easily peelable adhesive tape.

From the above description it follows that within the scope of the present Invention many variations are possible. For example, the adhesive can have a rubber component or a mixture of two or contain more rubbers. Either or both rubbers can also contain vinyl-silicon bonds, and the rubber can also contain vinyl groups as chain terminators. The amount of residual silanol can be varied, although preferred is that the material contains much less residual silanol than the rubber used in Comparative Example 1. the The amount of silicon-bonded aryl groups in the copolymer rubber can also be varied. So when using 13 Mol% diphenylsiloxane and one about 0.028 mm (corresponding to 1.1 mils) thick layer of adhesive on an approximately 0.075 well (corresponding 3 mils) thick mylar film has very low peel strength on the order of 5 g / cm (equivalent to 0.4 ounces / inch).

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Claims (1)

Claims Articles with a uniform, coherent document, a self-adhesive organopolysiloxane layer on at least one side of this base and a removable anti-adhesive layer, which comprises a film terminated with a silanol group containing dimethylpolysiloxane liquid is coated, on the self-adhesive organopolysiloxane, thereby characterized in that the adhesive comprises the condensation product of a mixture which is an organopolysiloxane resin and contains at least one alkylarylpolysiloxane rubber. Article according to claim 1, characterized in that the alkylarylpolysiloxane rubber has a viscosity of about 200,000 to about 15,000,000 centipoise at 25 ° C and contains an average of about 1.85 to 2.01 silicon-bonded alkyl and aryl radicals per silicon atom, wherein the alkyl and aryl radicals are selected from alkyl radicals with 1 to 8 carbon atoms, cycloalkyl radicals with 5 to 7 carbon atoms in the ring, lower alkenyl radicals with 2 to 8 carbon atoms, mononuclear aryl radicals, lower alkyl-substituted mononuclear aryl radicals with 1 to 6 carbon atoms in the alkyl group and the halogenated derivatives of the above radicals, wherein the organic radicals are bonded to the silicon via silicon-carbon bonds and about 2 to about 75 aryl-silicon bonds, based on the total number of silicon bonds to organic radicals, are present in the rubber and also about 0.001 to 0.25 wt -.% silicon-bonded hydroxyl or alkoxy groups and Organopolysiloxane resin has the following average formula for the units: • '< ^0H V ^0R \ ^R s ^Si Vq-rs P 2 wherein R is selected from the radicals mentioned above, OR is lower alkoxy has 1 to 8 carbon atoms per radical, s a value from 1.0 to 1.7 »q a value from 0 to 1, r a 409851/100 5 Has value from 0 to 1 and the sum of q. and r has a value of 0.01 to 1 has. 3. Article according to claim 1 and 2, characterized that the silanol-terminated dimethylpolysiloxane liquid has a viscosity of 1000 to Has 10,000,000 centipoise at 25 ° C. 4. Article according to claim 3, characterized in ₉ that the liquid corresponds to the following formula CH \ Si-O
CH \ W> 1., where ρ is an integer varying from about 300 to about 5260. 5. Article according to Claims 1 to H _3, characterized in that the thickness of the self-adhesive organopolysiloxane is in the range from about 0.02 to about 0.125 mm (corresponding to 0.7 to 5 mils). 6. Article according to claims 1 to 5 »characterized that the coated film comprises paper. 7. Article according to claims 1 to 6, characterized in that the thickness of the coated Film is between about 0.0005 and about 0.075 mm (corresponding to 0.02 to 3 mils). 8. Method of sticking an article with a self-adhesive Organopolysiloxane on a substrate, characterized , that he 409851/1005 .- 19 - (a) making an article comprising a base layer having a self-adhesive organopolysiloxane layer on at least one side carries and has a peelable anti-adhesive layer on the self-adhesive organopolysiloxane, which has a Includes film coated with a silanol-terminated dimethylpolysiloxane liquid, the Adhesive comprises the condensation product of a mixture comprising an organopolysiloxane resin and at least one alkylarylpolysiloxane rubber contains, (b) Separating the peelable anti-adhesive layer from the self-adhesive one Organopolysiloxane and (c) Gluing on the one containing the self-adhesive organopolysiloxane Article on a substrate. 409851/1005