Method for preparing polyoxyalkylene-organopolysiloxane copolymers
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United States of America Patent
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Jan 26, 2010
Grant Date -
Sep 28, 2006
app pub date -
Mar 22, 2006
filing date -
Mar 23, 2005
priority date (Note) -
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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.
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