The present application claims priority of Japanese patent application Ser. No. 82/156399, filed Sept. 8, 1982.
The present invention relates to novel foam-forming, room temperature vulcanizable (RTV) organopolysiloxane compositions having increased foam-forming ratio and excellent foamability. Some technologies have been known for RTV foam-forming organopolysiloxane compositions, but most of them could not be applied to commercial production.
In U.S. Pat. No. 3,070,555 Bruner invented RTV foam-forming organopolysiloxane compositions utilizing the dehydrogenation reaction of .alpha.,.omega.-diorganopolysiloxane diol and organohydrogenpolysiloxane in the presence of a stannous carboxylate catalyst.
In U.S. Pat. No. 3,338,847 Nitzsche invented similar compositions comprising .alpha.,.omega.-diorganopolysiloxane diol, organohydrogenpolysiloxane, and unsaturated hydrocarbon containing hydroxyorganopolysiloxane in the presence of a metal carboxylate catalyst.
In U.S. Pat. No. 2,956,032 Joyce invented flame retardant RTV foam-forming organopolysiloxane compositions comprising .alpha.,.omega.-diorganopolysiloxane diol, organohydrogenpolysiloxane, stannous carboxylate and NiBr.sub.2.
In U.S. Pat. No. 3,428,580 Nitzsche invented flame retardant RTV foam-forming organopolysiloxane compositions comprising .alpha.,.omega.-diorganopolysiloxane diol, organohydrogenpolysiloxane, quaternary ammonium salt catalyst and a heavy metal carboxylate.
In Nippon Tokkyo Koukoku Koho 45-11839 (Japanese Patent Publication) Murphy invented an RTV foam-forming organopolysiloxane composition comprising .alpha.,.omega.-diorganopolysiloxane diol, organohydrogenpolysiloxane and aminohydroxyorganopolysiloxane compounds as the dehydrogenation catalyst.
In Nippon Tokkyo Kokai Koho 51-46352 Endo invented RTV foam-forming organopolysiloxane compositions comprising .alpha.,.omega.-diorganopolysiloxane diol, organohydrogenpolysiloxane and a platinum catalyst.
However, all of these technologies gave RTV foam-forming compositions having low foam-forming capability and inferior foam-formability. Accordingly, the previous compositions could only be applied to limited commercial production. The present invention is based on the discovery of a new class of RTV foam-forming compositions which overcome the defects of previous technologies and provide improved compositions having high foam-forming ratios.