Silanol-free resins

Details Silanol-free resins Silanol-free resins

1976-06-16

1978-12-19

Marquis, Melvyn I.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 291SB, 260 37SB, 428447, 528 10, 528 12, 528 32, 528 40, 528 42, 528 43, C08L 4304

Patent

active

041305990

ABSTRACT:
A silicone molding composition with improved thermal shock resistance having a plasticizing amount of a silicone resin comprising chemically combined RSiO.sub.3/2 units and R.sub.2 SiO units where the R to Si ratio may vary from 1.0 to 1.9 and the ratio of RSiO.sub.3/2 units to R.sub.2 SiO units may vary from 1:2.5 to 1:5.0 and containing less than 0.5 weight percent of silanol groups and preferably being substantially free of silanol groups where R is a monovalent hydrocarbon radical. There is also provided by the present invention a process for improving the thermal shock resistance of a silicone molding composition by having in said composition the aforesaid resin.

REFERENCES:
patent: 2528615 (1950-11-01), Smith
patent: 2929830 (1960-03-01), Kunowski
patent: 3017386 (1962-01-01), Brown, Jr. et al.
patent: 3120500 (1964-02-01), Huntington et al.
patent: 3234179 (1966-02-01), Katchman et al.
patent: 3489782 (1970-01-01), Pruvost et al.
patent: 3634297 (1972-11-01), Campbell
patent: 3759867 (1973-09-01), Merrill et al.
patent: 3919344 (1975-11-01), Merrill et al.

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