Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1976-02-09
1977-12-20
Jacobs, Lewis T.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C08L 8304
Patent
active
040640965
ABSTRACT:
Curable, storage-stable liquid organopolysiloxane compositions are formulated by [A] admixing (a) a diorganopolysiloxane oil having a viscosity ranging from between 400 and 3,000 cps at 25.degree. C., said diorganopolysiloxane being terminated at its chain ends with a moiety selected from the group consisting of (CH.sub.3).sub.3 SiO.sub.0.5, (CH.sub.3).sub.2 CH.sub.2 =CHSiO.sub.0.5 and (CH.sub.3).sub.2 C.sub.6 H.sub.5 SiO.sub.0.5, and the organo radicals comprising the said diorganopolysiloxane being selected from the group consisting of methyl, vinyl and phenyl, with (b) silica having a specific surface area in excess of 80 m.sup.2 /g, (c) water, and (d) a Si-N bonded silylating agent; [B] next devolatilizing the mixtures [A]; and thence [C] admixing with the devolatilized product [B], (e) an .alpha.,.omega.-dihydroxypolysiloxane oil having a viscosity ranging from between 2,000 and 60,000 cps at 25.degree. C. and (f) an inorganic filler. Organopolysiloxane elastomers useful as molding compositions are prepared by curing the aforesaid formulations.
REFERENCES:
patent: 3642685 (1972-02-01), Matherly
patent: 3933729 (1976-01-01), Letoffe
Jacobs Lewis T.
Rhone-Poulenc Industries
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