Process for the preparation of siloxane-oxyalkylene copolymers

Details Process for the preparation of siloxane-oxyalkylene copolymers Process for the preparation of siloxane-oxyalkylene copolymers

C - Chemistry, Metallurgy

08

G

402/13, 403/29

C08G 77/46 (2006.01) C08J 9/00 (2006.01)

Patent

CA 1290886

IMPROVED PROCESS FOR THE PREPARATION OF SILOXANE-OXYALKYLENE COPOLYMERS ABSTRACT OF THE DISCLOSURE An improved process is provided for the preparation of siloxane-oxyalkylene copolymers by a solventless process via hydrosilation of oxyethylene-rich polyethers in the presence of carboxylic acids or carboxylic acid salts as a catalyst modifier. The use of a carboxylic acid or salt prevents acetal formation through the hydroxyl groups of the polyether and/or copolymer. The use of solvent, acetal treatment and solvent stripping steps of the conventional processes are eliminated and accordingly, environmental as well as economic benefits are achieved.

577046

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