HEAVY RELEASE ADDITIVE FOR RELEASE SHEET, POLYORGANOSILOXANE COMPOSITION FOR RELEASE SHEET, AND RELEASE SHEET

摘要

A heavy release additive for a release sheet comprises a condensation reaction product of dehydrative condensation reaction between (A) a polydiorganosiloxane of average polymerization degree of 500 to 10,000 and has at least one hydroxy or hydrolysable group per molecule and (B) a polyorganosiloxane resin composed of a (SiO4/2) unit and a (R3SiO1/2) unit (wherein R's independently represent a C1-12 monovalent hydrocarbon group or a C2-6 alkenyl group each having no aliphatic unsaturated bond), has a ratio of the (R3SiO1/2) unit to the (SiO4/2) unit of 0.6 to 1.2 by mole, and contains the hydroxy group and the hydrolysable group in the total content of 2.1 mass % or more and less than 10.0 mass %. The heavy release additive can have the effect of achieving an extremely great peel force compared with cases in which no additive is added.

主权项

1. A high-release additive for release sheets, comprising a condensation product which is obtained from dehydration condensation reaction of (A) a polydiorganosiloxane having an average degree of polymerization of 500 to 10,000 and containing at least one hydroxyl group or hydrolyzable group per molecule with (B) a polyorganosiloxane resin primarily comprising SiO4/2 units and R3SiO1/2 units, wherein R is each independently a monovalent hydrocarbon group of 1 to 12 carbon atoms free of aliphatic unsaturation or an alkenyl group of 2 to 6 carbon atoms, a molar ratio of R3SiO1/2 units to SiO4/2 units is in the range of 0.6 to 1.2, and the total content of hydroxyl and hydrolyzable groups is from 2.1% by weight to less than 10.0% by weight.