Pressure sensitive adhesive/release liner laminate

Claim 1

As an article of manufacture a laminate comprising a layer of pressure sensitive adhesive and at least one liner adhered to at least a portion of said layer; said pressure sensitive adhesive being the reaction product of components comprising (a) 30 to 70 weight parts of a polydiorganosiloxane having the general formula R 1 R 2 SiO(R 2 SiO) n SiR 2 R 1 wherein each R is a monovalent hydrocarbon radical, each R 1 is an alkenyl radical and n is an integer, (b) 70 to 30 weight parts of an organopolysiloxane which is constituted of R 2 3 SiO 1/2 units and SiO 2 units in a molar ratio in the range of R 2 3 SiO 1/2 units and SiO 2 units in a molar ratio in the range of 0.6:1 to 0.9:1, wherein R 2 is selected from the group consisting of alkyl radicals, alkenyl radicals, and the hydroxyl radical, and methyl radicals comprise at least 95 mol percent of all R 2 radicals, (c) an organohydrogenpolysiloxane free of aliphatic unsaturation having an average of at least 2 silicon-bonded hydrogen atoms in each molecule, in a quantity sufficient to provide from 1 to 40 silicon-bonded hydrogen atoms per alkenyl radical in component (a), and (d) a platinum-containing catalyst in a quantity sufficient to provide 0.1 to 1,000 weight parts platinum for each one million weight parts of the combined quantity of Components (a) through (c); Component (a) having a viscosity of at least 500,000 centipoise at 25° C.; component (b) having a silicon-bonded hydroxyl content of no more than 1 weight percent; and Component (c) having the formula Me 3 SiO(MeHSIO) a (Me 2 SiO) b SiOMe 3 wherein a has an average value of at least 3 and b has an average value of 0 or more; and said liner comprising a backing bearing an adhesive-releasing coating durably adhered thereto which is the reaction product of components consisting essentially of (e) a fluorosilicone polymer having the formula ViMe 2 SiO(Me 2 SiO) x {R 3 QSi(Me)O} y (MeViSiO) Z SiMe 2 Vi, wherein Me denotes methyl, Vi denotes vinyl, R 3 Q has a formula CF 3 CF 2 CF 2 CF 2 CH 2 CH 2 and the sum of x+y+z has a value of about 2500, and containing from 0.1 to 1.0 mol percent vinyl-containing siloxane units and at least 30 mol percent siloxane units which bear R 3 Q radicals, (f) an organohydrogenpolysiloxane having the formula Me 3 SiO(MeHSiO) 28 {R 3 QSi(Me)} 12 SiMe 3 wherein R 3 Q has the formula CF 3 CF 2 CF 2 CF 2 CH 2 CH 2 and Me denotes methyl, in a quantity sufficient to provide 1-40 silicon-bonded hydrogen atoms per vinyl radical in Component (e), and (g) a platinum-containing catalyst in a quantity sufficient to provide 0.1 to 1,000 weight parts platinum for each one million weight parts of the combined quantity of Components (e) and (f).