Method and apparatus for the preparation of silicone elastomer f

Details Method and apparatus for the preparation of silicone elastomer f Method and apparatus for the preparation of silicone elastomer f

1992-07-24

1992-12-29

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 81, 521 82, 521 91, 521110, 521133, 521154, C08J 912

Patent

active

051751712

ABSTRACT:
In accordance with the present method for preparing an elastomeric silicone foam, an inert gas is injected under superatmospheric pressure during or after the merging of a silanol-containing organopolysiloxane that is liquid at room temperature an organohydrogenpolysiloxane that is liquid at room temperature, and hydrosilation catalyst, the merging step is followed by mechanical mixing in an enclosed chamber, at which time the mixture is ejected into the atmosphere. Completion of cure with simultaneous evolution of hydrogen occur under atmospheric pressure with the reactive ingredients and the inert gas all present in a homogeneously microdispersed/mixed state. The present method stabilizes the cells formed by the hydrogen and makes possible the development of a large quantity of cells of uniform size and uniform distribution, resulting in a high-expansion ratio foam.

REFERENCES:
patent: 4026844 (1977-05-01), Kittle et al.
patent: 4367293 (1983-01-01), Schmitzu
patent: 4368279 (1983-01-01), Modic et al.
patent: 4418157 (1983-11-01), Modic
patent: 4590222 (1986-05-01), Bauman

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