Silicone emulsion composition and process for producing silicone

Details Silicone emulsion composition and process for producing silicone Silicone emulsion composition and process for producing silicone

1997-07-30

2000-06-06

Wu, David W.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524837, 524861, 524862, 528 15, C08K 906

Patent

active

060719877

ABSTRACT:
A silicone emulsion composition is disclosed which comprises specific amounts of (A) a colloidal silica-silicone core/shell material comprising (a) from 80 to 5 wt % colloidal-silica cores and (b) from 20 to 95 wt % shells comprising a specific polyorganosiloxane containing ethylenically unsaturated groups, (B) a specific polyorganohydrogensiloxane, (C) a curing catalyst, (D) an emulsifying agent, and (E) water. Also disclosed is a process for producing a silicone powder which comprises bringing the silicone emulsion composition into contact with a liquid or a gas while heating the composition at a temperature of 25.degree. C. or a higher and keeping the same in a dispersed state to thereby cure the silicone in the form of a powder. The silicone emulsion composition can give an elastomer having excellent mechanical properties upon the removal of the volatile components by heating. The particulate silicone obtained by the process from the emulsion composition has excellent mechanical strength, a small particle diameter, good uniformity in shape, and excellent dispersibility.

REFERENCES:
patent: 4743670 (1988-05-01), Yoshida
patent: 4761454 (1988-08-01), Oba et al.
patent: 5188899 (1993-02-01), Matsumoto et al.
patent: 5218014 (1993-06-01), Matsumoto et al.
patent: 5312860 (1994-05-01), Mize et al.

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