Patent ID: 6271271
Filing Date: 2001-08-07
Classification: C08G,C08J,C08L

Abstract:
Foamed organosilicon compositions, prepared by mixing of organosiloxane rubber, organosilicon joining agent and modifier, wherein said organosiiloxane rubber is represented by polyorganosiloxane block co-polymers having general formula as follows:{[R.sup.1 SiO.sub.1,5 ].sub.a [R.sup.2 (OH)SiO].sub.b, [R.sup.3 R.sup.4 SiO].sub.c }.sub.n,having respective OH groups content from 0.2% to 4.0 mass % and mol. % ratio of R.sup.3 R.sup.4 SiO units to R.sup.1 SiO.sub.1,5 falling within the range 0.850-10,000, correspondingly, where: R.sup.1, R.sup.2, R.sup.3, R.sup.4 are aliphatic radicals having from 1 to 6 carbon atoms; phenyl, n is an integer from 30 to 360; c=1; a=0.019-3.760; b=0.008-0.240 or mixture of the above block-copolymer with the .alpha., .omega.-dihydroxypolydiorganosiloxane of viscosity at 20.degree. C. from 24 P up to 160 P in the ratio of mass parts as (0.05-0.5):1, respectively; while the polyorganohydridesiloxanes act as an organosilicon joining agent, having general formula as follows:R.sub.3.sup.5 SiO[R.sup.6 (H)SiO].sub.m --[R.sub.2.sup.5 SiO].sub.n SiR.sub.3.sup.5,having the contents of SiH groups falling within the range of (0.35-1.80) mass %; molecular mass limited by 50-200, where: R.sup.5, R.sup.6 is the alkyl radical having from 1 to 6 carbon atoms; m is an integer from 1 to 20, n is an integer from 0 to 19; m.div.n=20, or at least one substance from the compositions having general formula as follows:R.sup.7 SiX.sub.3, where:R.sup.7 =alkyl radical having from 1 to 6 carbon atoms,CH.sub.2.dbd.CH--, X:--ON.dbd.C(CH.sub.3).sub.2, --OC(O)--CH.sub.3,and organosilicon amines are used as a modifier, having general formula as follows:R.sup.8 R.sup.9 N--(CH.sub.2).sub.n --Si(OR.sup.10).sub.3, whereR.sup.8.dbd.R.sup.9.dbd.H--, CH.sub.3 --, C.sub.2 H.sub.5 --, R.sup.10.dbd.--CH.sub.3 --, C.sub.2 H.sub.5 --, n is an integer from 0 to 3 or mixture of sodium bicarbonate with zinc oxide, or non-organic compound of cobalt with 34 mass % cobalt content, with the proviso of mass fraction ratio of mixed components as follows:organosiloxane rubber: 100 organosilicon joining agent: 2-15 modifier: 2-22.