Microemulsions of gel-free polymers

Details Microemulsions of gel-free polymers Microemulsions of gel-free polymers

1996-12-26

1997-11-04

Glass, Margaret W.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

424 7012, 252311, C08L 8308

Patent

active

056840853

ABSTRACT:
Described is a method of preparing microemulsions of organopolysiloxanes, by copolymerizing a cyclic siloxane and a polyfunctional silane, in an aqueous medium containing a nonionic surfactant, an anionic or cationic surfactant, and a catalyst, until the desired increase in molecular weight is obtained. The invention resides in controlling the gel content of the organopolysiloxanes in the microemulsion by control of the concentration of silane and concentration of silanol in the resulting organopolysiloxane, such that a functionality ratio .phi. results in formation of a gel-free polymer molecular weight distribution of finite organopolysiloxane species in the microemulsion.

REFERENCES:
patent: 4935464 (1990-06-01), Ona et al.

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