Method of preparing heat cured siloxane foams using rhodium cata

Details Method of preparing heat cured siloxane foams using rhodium cata Method of preparing heat cured siloxane foams using rhodium cata

1975-07-14

1977-05-31

Foelak, Morton

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 37SB, 260 25D, 260 25FP, 260 465G, 260 465H, 260 465UA, 260825, C08J 902

Patent

active

040268357

ABSTRACT:
Siloxane foams which are activated and cured by heating can be prepared by mixing an organohydrogensiloxane, a hydroxylated organosiloxane and a rhodium catalyst in amounts such that the ratio of silicon-bonded hydrogen atoms to silicon-bonded hydroxyl radicals is from 2.5 to 40 and thereafter heating the mixture above 90.degree. C. The rhodium catalyst provided a pot life of at least 8 hours when used in amounts of 0.0025 grams per 100 grams of hydroxylated organosiloxane. The siloxane foams can be made to have an increased fire retardant property by adding 0.01 to 2 parts by weight carbon black based on the weight of the total composition. Siloxane foams are also prepared from mixing an organohydrogensiloxane, a hydroxylated organosiloxane, a vinyl containing triorganosiloxy endblocked polydiorganosiloxane and a rhodium catalyst. These foams can be used for cushioning, in acoustical applications and protective filling or coating applications and especially applications wherein fire retarding is important.

REFERENCES:
patent: 3070555 (1962-12-01), Bruner, Jr.
patent: 3425967 (1969-02-01), Modic
patent: 3677981 (1972-07-01), Wada et al.
patent: 3923705 (1975-12-01), Smith

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