Claims
- 1. A process for rendering the surface of a solid substrate less adherent to materials that normally adhere thereto, said process comprising
- (I) applying to said surface a coating of a liquid curable composition comprising
- (A) an organosilicon compound having the formula XR.sub.2 SiO(RXSiO).sub.x SiR.sub.2 X wherein R denotes a monovalent hydrocarbon or halohydrocarbon radical free of aliphatic unsaturation and having 1-20 carbon atoms, at least 50 percent of all R radicals being methyl, X denotes a radical selected from the group consisting of olefinic hydrocarbon radicals having from 2 to 20 carbon atoms and R radicals, an average of at least two X radicals per molecule of Component (A) being olefinic hydrocarbon radicals, the subscript x has an average value sufficient to provide a viscosity at 25.degree. C. of at least 25 millipascal-seconds for the Component (A);
- (B) an organohydrogensilicon compound having the formula YR.sub.2 SiO(RYSiO).sub.y SiR.sub.2 Y wherein R denotes a monovalent hydrocarbon or halohydrocarbon radical free of aliphatic unsaturation and having 1-20 carbon atoms, at least 50 percent of all R radicals being methyl, Y denotes a hydrogen atom or an R radical, an average of at least two Y radicals per molecule of Component (B) being hydrogen atoms, the subscript y has average values sufficient to provide a viscosity at 25.degree. C. of from 1 to 100 millipascal-seconds for the Component B), the ratio of the amounts of (A) to (B) being sufficient to provide from 0.5 to 2 silicon-bonded hydrogen atoms for every silicon-bonded olefinic hydrocarbon radical;
- (C) a platinum-containing compound in sufficient amount to accelerate the curing reaction among said silicon-bonded curing radicals and said silicon-bonded hydrogen atoms;
- (D) an inhibitor compound for said accelerated curing reaction having the formula R.sup.1 (OD).sub.h O.sub.2 CCH.dbd.CHCO.sub.2 (DO).sub.h R.sup.1, wherein R.sup.1 denotes, independently, a monovalent hydrocarbon radical having from 1 to 10 carbon atoms, each D denotes, independently, an alkylene radical having from 2 to 4 carbon atoms, and the subscript h has a value of 0 or 1, in a total amount sufficient to retard the curing reaction at room temperature but insufficient to prevent said reaction at elevated temperature; and
- (E) a bath life extender compound selected from the group consisting of compounds containing at least one primary or secondary alcohol radical, carboxylic acids, compounds which yield carboxylic acids when exposed to water at room temperature, cyclic ethers, and water, in a total amount sufficient to further retard the curing reaction at room temperature; and
- (II) subjecting the applied coating to heat and/or actinic radiation for a period of time sufficient to cure the applied coating.
- 2. A process in accordance with claim 1 wherein at least a portion of the composition is applied to a substrate more than 8 hours after the components thereof were mixed and the applied coating is heated at a temperature of from 70.degree. to 150.degree. C. for 30 seconds or less.
- 3. A process in accordance with claim 1 wherein Component (A) has the formula XMe.sub.2 SiO(Me.sub.2 SiO).sub.b (MeXSiO).sub.d SiMe.sub.2 X wherein Me denotes methyl, X denotes a radical selected from the group consisting of olefinic hydrocarbon radicals having from 2 to 20 carbon atoms and methyl radicals, an average of at least two X radicals per molecule of Component (A) being olefinic hydrocarbon radicals, the subscripts b and d have average values of zero or more, and the sum of b plus d has a value sufficient to provide a viscosity at 25.degree. C. of at least 25 millipascal-seconds for the Component (A) and Component (B) has the formula YMe.sub.2 SiO(Me.sub.2 SiO).sub.p (MeYSiO).sub.q SiMe.sub.2 Y wherein Y denotes a hydrogen atom or a methyl radical, an average of at least two Y radicals per molecule of Component (B) being hydrogen atoms, the subscripts p and q have average values of zero or more, the sum of p plus q has a value sufficient to provide a viscosity at 25.degree. C. of from 1 to 100 millipascal-seconds for the Component B), the ratio of the amounts of (A) to (B) being sufficient to provide from 0.5 to 2 silicon-bonded hydrogen atoms for every silicon-bonded olefinic hydrocarbon radical; Component (C) is a vinyl-siloxane complex of chloroplatinic acid; Component (D) is a fumarate having the formula R.sup.1 (OD).sub.h O.sub.2 CCH.dbd.CHCO.sub.2 (DO).sub.h R.sup.1 ; and Component (E) is a primary or secondary alcohol.
- 4. A process according to claim 3 wherein the substrate is a flexible sheet material.
- 5. A process according to claim 4 wherein the flexible sheet material is paper.
- 6. A process according to claim 4 further comprising (III) releasably adhering a pressure sensitive adhesive composition to the cured applied coating.
- 7. A process in accordance with claim 3 wherein Component (A) has the formula HexMe.sub.2 SiO(Me.sub.2 SiO).sub.b (MeHexSiO).sub.d SiMe.sub.2 Hex, wherein Hex denotes CH.sub.2 .dbd.CHCH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 --, Component (B) has the formula Me.sub.3 SiO(Me.sub.2 SiO).sub.p (MeHSiO).sub.q SiMe.sub.3, Component (D) is diethyl fumarate and Component (E) is benzyl alcohol.
- 8. A process in accordance with claim 3 wherein Component (A) has the formula ViMe.sub.2 SiO(Me.sub.2 SiO).sub.b (MeViSiO).sub.d SiMe.sub.2 Vi, wherein Vi denotes CH.sub.3 .dbd.CH--, Component (B) has the formula Me.sub.3 SiO(Me.sub.2 SiO).sub.p (MeHSiO).sub.q SiMe.sub.3, Component (D) is diethyl fumarate and Component (E) is benzyl alcohol.
Parent Case Info
This is a divisional of copending application Ser. No. 07/431,352 filed on Nov. 3, 1989, now U.S. Pat. No. 5,036,117.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4774111 |
Lo |
Sep 1988 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
431352 |
Nov 1989 |
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