Pressure sensitive adhesive release liner and fluorosilicone compounds, compositions and method therefor

Claim 1

Coated substract provided by a method comprising (i) applying to the surface of said substrate a coating of a coating composition comprising a curable mixture consisting essentially of (A) a fluorosilicone polymer containing an average of at least two silicon-bonded curing radicals per molecule selected from the group consisting of hydrogen, hydroxyl and alkenyl and at least 2 mol percent, based on the total number of siloxane units in the fluorosilicone polymer, of fluorinated siloxane units, any remaining siloxane units in the polymer being non-fluorinated siloxane units; said fluorinated siloxane units having the formula (RQ)(R').sub.a (Z).sub.b SiO.sub.(3-a-b)/2 and said non-fluorinated siloxane units having the formula (R').sub.c (Z).sub.d SiO.sub.(4-c-d)/2 where, in said fluorinated and non-fluorinated siloxane units, R denotes a perfluoroalkyl radical having from 4 to 8 carbon atoms and, additionally, 2 to 3 carbon atoms when the fluorosilicone polymer contains less than 90 mol percent fluorinated siloxane units and 1 carbon atom when the fluorosilicone polymer contains from 7 to 10 mol percent fluorinated siloxane units, Q denotes a divalent hydrocarbon, hydrocarbon ether or hydrocarbon thioether radical linking the R radical to a silicon atom through at least 2 carbon atoms, R' denotes a silicon-bonded, monovalent hydrocarbon radical free of aliphatic unsaturation, Z denotes said silicon-bonded curing radical, a=0 to 2, b=0 to 2, a+b=0 to 2, c=0 to 3, d=0 to 3 and c+d=0 to 3 and, (B) an effective amount of a curing agent for the fluorosilicone polymer and, (ii) thereafter causing the applied curable mixture to cure.