Patent ID: 7288592
Filing Date: 2007-10-30
Classification: C08F,C09D

Abstract:
1. A solid, transparent organic silicone copolymer or hydrolysis product thereof, prepared by solution polymerizing monomers comprising: a1) ≧50% by weight of at least one vinyl ester of optionally branched alkyl carboxylic acids having from 1 to 15 carbon atoms, and a2) from 0 to 20% by weight of one or more monounsaturated olefins and/or dienes, and b) from 1 to 50% by weight of one or more silicones of the formula R c) from 0 to 10% by weight of one or more ethylenically unsaturated hydrolyzable silicon compound monomers or mercaptosilane monomers different from silicones b), the amounts in % by weight for components a) to c) based on the overall weight of the monomers used and adding up to 100% by weight, in a nonaqueous solvent mixture in the presence of at least one free-radical initiator, wherein the nonaqueous solvent mixture comprises a mixture of at least two nonaqueous solvents of which at least one has a transfer constant C wherein the silicone copolymer has a complex melt viscosity of from 5 to 30,000 mPa·s and a phase angle δ of 45°, measured at a temperature within the range of 100° C. to 140° C., and optionally hydrolyzing the product thus obtained.