Method for preparing polyoxyalkylene-organopolysiloxane copolymers
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsMitsuo Asai, Shinichi Morioka
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Abstract
A polyoxyalkylene-organopolysiloxane copolymer is prepared by reacting a polyoxyalkylene allyl ether with an organohydrogenpolysiloxane in the presence of a platinum group metal catalyst. In one embodiment, a polyoxyalkylene allyl ether having a CPR value of less than 0.5 is used. In another embodiment, a polyoxyalkylene allyl ether having a CPR value of less than 5 is used and an acid is added for neutralization prior to the reaction. The copolymer can be produced while substantially eliminating solvents and additives or minimizing the amounts thereof.
Claims8
A method for preparing a polyoxyalkylene-organopolysiloxane copolymer, comprising the step of reacting a polyoxyalkylene allyl ether having the general formula (1):
- CH2═CHCH2O(C2H4O)a(C3H6O)bR (1)
- wherein R is hydrogen, a C1-C10 alkyl group, C1-C10 acyl group or C2-C1alkenyl 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, with an organohydrogenpolysiloxane in the presence of a platinum group metal catalyst, characterized in that said polyoxyalkylene allyl ether has a CPR value of less than 0.5.
A method for preparing a polyoxyalkylene-organopolysiloxane copolymer, comprising the step of reacting a polyoxyalkylene allyl ether having the general formula (1):
- CH2═CHCH2O(C2H4O)a(C3H6O)bR (1)
- wherein R is hydrogen, a C1-C10 alkyl group, C1-C10 acyl group or C2-C10 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, with an organohydrogenpolysiloxane in the presence of a platinum group metal catalyst, characterized in that said polyoxyalkylene allyl ether has a CPR value of less than 5, and prior to the reaction, an acid or an acid solution is added in a sufficient amount to neutralize the alkali quantity calculated from the CPR value.
Dependencies are inferred from the claim text.