| 摘要 |
<p>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?1, R2, R3, R6, R7, R10, R11, and R12¿ 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?6 and R7¿ is an alkenyl group, R?4, R5, R8, and R9¿ 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?13, R14, R15, R18, R19, R22, R23, and R24¿ 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?13, R14, R15, R18, R19, R22, R23, and R24¿ are alkenyl group, R?16, R17, R20, and R21¿ 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?36, R37, R38, R43, R44, and R45¿ are each independently selected from hydrogen, an alkyl group, an aryl group, and an aralkyl group, R?39, R40, R41, and R42¿ 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.</p> |
