RELEASE LAYERS AND COMPOSITIONS FOR FORMING THE SAME

Release compositions include (a) from zero to about 30 parts by weight of a polymer selected from the group consisting of formula (I) wherein R , R , R , R , R , R , R , and R are each independently selected from an alkyl group, an alkenyl group, an aryl group, and an aralkyl group, such that at least one of R and R is an alkenyl group, R , R , R , and R are each independently selected from an alkyl group, an aryl group, and an aralkyl group, 1, m, and n are each independently an integer so long as the polymer contains greater than 3 mol% vinyl-containing siloxane groups; a (vinyl siloxyl)(siloxyl)-modified silica having a vinyl content of at least about 0.4 vinyl equivalent/kg; and a combination thereof; (b) more than about 20 parts by weight of a polymer having the formula (II) wherein R , R , R , R , R , R , R , and R are each independently selected from an alkyl group, an alkenyl group, an aryl group, and an aralkyl group, such that at least two of R , R , R , R , R , R , R , and R are alkenyl group, R , R , R , and R are each independently selected from an alkyl group, an aryl group, and an aralkyl group, p, q, and r are each independently integers so long as the polymer has less than 3 mol% vinyl-containing siloxane groups; and (c) up to about 20 parts by weight of a cross-linking agent of the formula (III) wherein R , R , R , R , R , and R are each independently selected from hydrogen, an alkyl group, an aryl group, and an aralkyl group, R , R , R , and R are each independently selected from hydrogen, an alkyl group, and an aryl group, X is O, or a divalent organic linking group, and s and t are independently integers so long as there are at least two functional groups capable of cross-linking per molecule. These compositions are particularly useful in forming low peel force layers that can be useful in an electrophotographic system to form a release layer on a photoreceptor, a drying element, and the like. L'invention porte sur des compositions de libération comprenant (a) de zéro à environ 30 parties en poids d'un polymère sélectionné dans le groupe comprenant la formule (I) dans laquelle R , R , R , R , R , R , R et R sont chacun indépendamment sélectionnés à partir d'un groupe alkyle, un groupe alcényle, un groupe aryle et un groupe aralkyle de sorte que, au moins un de R et R soit un groupe alcényle, R , R , R et R sont chacun indépendamment sélectionnés dans un groupe alkyle, un groupe aryle et un groupe aralkyle, 1, m et n étant chacun indépe