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 R¹R₂SiO(R₂SiO) n SiR₂R¹ wherein each R is a monovalent hydrocarbon radical, each R¹ is an alkenyl radical and n is an integer, (b) 70 to 30 weight parts of an organopolysiloxane which is constituted of R²₃SiO 1/2 units and SiO₂ units in a molar ratio in the range of 0.6:1 to 0.9:1, wherein R² is selected from the group consisting of alkyl radicals, alkenyl radicals and the hydroxyl radical and the methyl radical comprises at least 95 mol percent of all R² 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); 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 YMe₂SiO(Me₂SiO) x {R³QSi(Me)O} y (MeASiO) z SiMe₂Y, wherein Y denotes a radical selected from the group consisting of Me, R³Q or A, A denotes an alkenyl radical and Me denotes the methyl radical, R³ denotes a perfluoroalkyl radical having from 2 to 8 carbon atoms, Q denotes a divalent hydrocarbon radical linking the R³ radical to a silicon atom by at least 2 carbon atoms and the values of x, y and z are each greater than zero and are such that the fluorosilicone polymer contains from 0.1 to 10 mol percent alkenyl-containing siloxane units and at least 5 mol percent siloxane units which bear R³Q radicals, (f) 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 (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).