Method for the synthesis of polyether siloxanes

Details Method for the synthesis of polyether siloxanes Method for the synthesis of polyether siloxanes

1993-05-17

1995-02-21

Bleutge, John C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 13, 528 16, 528 18, 528 14, 556445, 525479, 525474, 568620, C08G 7708

Patent

active

053916794

ABSTRACT:
Polyether siloxanes, which are linked to the polysiloxane backbone through Si--C bonds, are synthesized by reacting given polysiloxanes with a compound having at least one epoxide group in such amounts, that there are at least two epoxide groups per OH group, in the presence of Lewis acids at temperatures not exceeding 60.degree. C. or in the presence of complex catalysts, which accelerate the addition between epoxide groups and hydroxyl groups, at temperatures up to 140.degree. C., the reaction optionally being carried out in the presence of an inert solvent. The polyether siloxanes obtained have a defined functionality and are free of excess, unreacted polyol components.

REFERENCES:
patent: 2293868 (1942-08-01), Toussaint
patent: 2538072 (1951-01-01), Zech
patent: 2846458 (1958-08-01), Haluska
patent: 3057901 (1962-10-01), Plueddemann
patent: 4665239 (1987-05-01), Panek et al.
Handbook of Epoxy Resins, Lee and Neville; 1982, pp. 2-16.

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