Patent ID: 6313249
Filing Date: 2001-11-06
Classification: C08F,C08G

Abstract:
A method for the preparation of a graft copolymer having a carbon-carbon backbone chain structure and having grafting units comprising organopolysiloxane residues each bonded to a carbon atom of the carbon-carbon backbone chain structure which comprises the steps of:(1) dissolving, in an organic solvent, (a) a radical-polymerizable ethylenically unsaturated organic monomeric compound, (b) a grafting unit-introducing radical-polymerizable monomeric compound comprising (b1) an organopolysiloxane compound terminated at a single molecular chain end of the molecule by a radical-polymerizable group and (c) a radical-polymerization initiator to form a polymerization mixture;(2) heating the polymerization mixture at an elevated temperature to form a polymer solution by the copolymerization reaction of the organic monomeric compound (a) and the organopolysiloxane compound having a radical-polymerizable terminal group (b1) in the presence of the radical-polymerization initiator (c);(3) subjecting the polymer solution to a hydrogenation reaction under pressurization with hydrogen gas in the presence of a hydrogenation catalyst; and(4) removing the hydrogenation catalyst from the polymer solution to give an organopolysiloxane-grafted copolymer free from aliphatic unsaturation.