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

1987-09-09

1989-07-11

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

556437, 556444, C07F 708

Patent

active

048473987

ABSTRACT:
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.

REFERENCES:
patent: 3280160 (1966-10-01), Bailey
patent: 4025456 (1977-05-01), Litteral et al.
patent: 4059606 (1977-11-01), Walsingham
patent: 4160775 (1979-07-01), Schilling
patent: 4431789 (1984-02-01), Okazaki et al.
patent: 4520160 (1985-05-01), Brown

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