Patent ID: 7652114

Claim:
A method for preparing a polyoxyalkylene-organopolysiloxane copolymer, comprising the steps of neutralizing a polyoxyalkylene allyl ether having the general formula (1): CH 2 ═CHCH 2 O(C 2 H 4 O) a (C 3 H 6 O) b R (1) wherein R is hydrogen, a C 1 -C 10 alkyl group, C 1 -C 10 acyl group or C 2 -C 10 alkenyl group, a is a number of 0 to 50, b is a number of 0 to 50, and the sum of a+b is from 1 to 100, said polyoxyalkylene allyl ether having a CPR value of more than 0.5, with an acid selected from the group consisting of hydrochloric acid, sulfuric acid, nitric acid, acetic acid, oxalic acid, malic acid, and succinic acid, to form a polyoxyalkylene allyl ether having a CPR value of less than 0.5, and then reacting the polyoxyalkylene allyl ether group having a CPR value of less than 0.5, in the substantial absence of a solvent and in a substantially oxygen gas-free atmosphere, with an organohydrogenpolysiloxane in the presence of a platinum group metal catalyst to form said polyoxyalkylene-organopolysiloxane copolymer.