Reduction of silicone foam density using buffers

Details Reduction of silicone foam density using buffers Reduction of silicone foam density using buffers

1990-10-15

1991-05-21

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 82, 521 88, 521117, C08J 900

Patent

active

050176242

ABSTRACT:
A method is provided for preparing a silicone foam having reduced density of about 5 to about 6 pounds per cubic foot, comprising the step of agitating a mixture of ingredients comprising (A) a silicon composition, comprising by weight: (1) 100 parts of a vinyl-terminated polydiorganosiloxane (2) about 0.5 to about 5 parts by weight of an aqueous buffer solution having a pH in the range of about 9 to about 10; and (3) about 25 to about 140 parts per million of a platinum catalyst; (8) about 2.5 to about 20 parts of a substantially linear hydride polysiloxane (C) about 0.1 to about 15 parts of a cyclic hydride polysiloxane; and (D) about 0.1 to about 5 parts of a hydroxyl source selected from the group consisting of water, organic alcohol, or a mixture of the foregoing.

REFERENCES:
patent: 4418157 (1983-11-01), Modic
patent: 4851452 (1989-07-01), Gross et al.
patent: 4879317 (1989-11-01), Smith et al.

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