Patent ID: 9175198
Filing Date: 2015-11-03
Classification: C08G,C09J

Abstract:
1. A method of obtaining a silicone pressure-sensitive adhesive composition comprising the sequential steps of: (I) forming a polymer mixture comprising: wherein the at least one polyorganosiloxane has an average solution viscosity of from about 1 mm wherein polymerization is facilitated by addition of at least one condensation catalyst and occurs at a temperature of from about 30° C. to about 110° C., wherein the silicone polymer formed has a solution viscosity of from about 10,000 mm wherein the resin has a hydroxyl group content of from about 0.5% to about 2.5% (by weight based on resin solids content), wherein the resin comprises R wherein R is independently selected from a monovalent hydrocarbon or a halohydrocarbon radical having from 1 to 20 carbon atoms, an alkenyl radical, or a hydroxyl radical and wherein the polymer mixture optionally includes the silicone resin; and (II) mixing with the polymer mixture of (I), at least one bodying catalyst and a silicone resin that has at least one hydroxyl group capable of undergoing bodying; and then allowing a bodying reaction to occur at a temperature of from about 40° C. to about 145° C. to form the silicone pressure-sensitive adhesive composition, wherein the resin is soluble in at least one hydrocarbon solvent or silicone fluid, wherein the resin has a hydroxyl group content of from about 0.5% to about 2.5% (by weight based on resin solids content), wherein the silicone resin comprises R wherein R is independently selected from a monovalent hydrocarbon or a halohydrocarbon radical having from 1 to 20 carbon atoms, an alkenyl radical, or a hydroxyl radical; and (III) optionally, adding to the silicone pressure-sensitive adhesive composition of (II) from about 0.5% to about 3.5% (by weight) of an organic peroxide.