Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1975-06-06
1978-02-07
Foelak, Morton
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 25B, 260375B, 260 465UA, 260 465G, 260 465H, C08J 932
Patent
active
040726355
ABSTRACT:
An organosiloxane gel is made by reacting (1) an organosiloxane having a viscosity of from 10 to 10,000 centistokes at 25.degree. C. and being a copolymer consisting essentially of units of the formula R.sub.2 ViSiO.sub.0.5, RViSiO, R.sub.2 SiO and MeR.sub.2 SiO.sub.0.5, where each R is individually selected from the group consisting of methyl and phenyl radicals, Vi represents a vinyl radical and Me represents a methyl radical, at least 0.50 molar percent of the units in said copolymer being R.sub.2 ViSiO.sub.0.5 units and RViSiO units where the terminal groups are at least 50 mole percent of R.sub.2 ViSiO.sub.0.5 units and may have as the rest of the total terminal units MeR.sub.2 SiO.sub.0.5 units, (2) a liquid hydrogen siloxane of the average general formula XRMeSIO(R.sub. 2 SiO).sub.n (RHSiO).sub.m SiMeRX, where each R is as above defined and X is selected from the group consisting of H and R and n and m have such average values that the viscosity of the hydrogen siloxane is no more than 10,000 centistokes at 25.degree. C. and m is at least 1, no more than 25 molar percent of the total R radicals present in (1) and (2) being phenyl and (3) a platinum or platinum compound catalyst in an amount sufficient to furnish about at least 0.1 part per million of platinum based upon the combined weights of (1) and (2); the proportions of (1) and (2) being such that prior to reaction there is an average of from 1.4 to 1.8 gram atoms of the silicon-bonded hydrogen atoms in (2) per gram molecular weight of (1) and there being at least one vinyl siloxy units in (1) for every silicon-bonded hydrogen atom in (2), the molecular weight of (1) being calculated by the equation:
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Foelak Morton
General Electric Company
Koltos E. Philip
Neuhauser Frank L.
Voss Donald J.
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