Foamable organopolysiloxane composition

Details Foamable organopolysiloxane composition Foamable organopolysiloxane composition

1990-07-26

1991-01-22

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 91, 521154, 525477, 528 33, C08J 902

Patent

active

049871552

ABSTRACT:
The invention provides a foamable organopolysiloxane composition capable of giving, by foaming and curing at room temperature, a silicone rubber foam of high foaming expansion having very uniform and dense cellular structure. The composition is prepared by a process comprising the steps of: (A) compounding an .alpha.,.omega.-dihydroxy dimethylpolysiloxane with a reinforcing silica filler, hexamethyl disilazane and water as the hydrolysis agent of the silazane to give a compound; (B) removing ammonia in the compound formed by the hydrolysis of the silazane compound as completely as possible; and (C) compounding the compound with a polyhydroxy methylpolysiloxane, an organohydrogenpolysiloxane and a platinum compound as a catalyst for the dehydrogenation reaction between the silanolic hydroxy groups and the silicon-bonded hydrogen atoms to produce hydrogen as the foaming gas.

REFERENCES:
patent: 4460712 (1984-07-01), Blizzard et al.
patent: 4772516 (1988-09-01), Mahone
patent: 4801622 (1989-01-01), Inoue

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