Blowing agent compositions and compositions curable to give elas

Details Blowing agent compositions and compositions curable to give elas Blowing agent compositions and compositions curable to give elas

1993-04-09

1994-07-26

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 99, 521154, C08J 900

Patent

active

053327624

ABSTRACT:
Blowing agent compositions (a) comprising aqueous emulsions containing organopolysiloxanes (1), emulsifiers (2), water (3) and thickeners (4) which may be used in the preparation of elastomeric silicone foams.
The blowing agent compositions are used in curable compositions to form elastomeric silicone foams which comprise the blowing agent compositions (a), diorganopolysiloxanes (b), crosslinking agents (c) and, if appropriate, crosslinking catalysts (d) and optionally fillers (e). Elastomeric silicone foams are prepared by mixing the blowing agent compositions (a), with curable organopolysiloxane compositions containing diorganopolysiloxanes (b), crosslinking agents (c) and, if appropriate, crosslinking catalysts (d) and optionally fillers (e) and also optionally additional substances and then the resultant mixture is cured at temperatures in the range of from 100.degree. to 250.degree. C. with simultaneous foaming to form the elastomeric silicone foams.

REFERENCES:
patent: 2857343 (1958-10-01), Berridge
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patent: 4613630 (1986-09-01), Bauman et al.
patent: 4871781 (1989-10-01), Weise
patent: 5019295 (1991-05-01), Yoshida et al.
patent: 5061736 (1991-10-01), Takahashi et al.

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