Microemulsions of gel-free polymers

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

C - Chemistry, Metallurgy

08

G

C08G 77/06 (2006.01) C08L 83/04 (2006.01)

Patent

CA 2180086

Described is a method of preparing microemulsions of organopolysiloxanes, achieved 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 organopoly- siloxane, such that a functionality ratio .PHI. results in formation of a gel-free polymer molecular weight distribution of finite organopolysiloxane species in the microemulsion.

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