Coated composite high voltage electrical insulator

Details Coated composite high voltage electrical insulator Coated composite high voltage electrical insulator

2007-06-19

2007-06-19

Peng, Kuo-Liang (Department: 1712)

Stock material or miscellaneous articles

Composite

Of silicon containing

C524S588000, C528S034000

Reexamination Certificate

active

11130107

ABSTRACT:
A polymer base composite high voltage insulator is described having a monolithic protective coating of a one-part room temperature vulcanizable organopolysiloxane rubber composition obtained by mixinga) from about 20 to about 60 weight percent of one or more polydiorganosiloxane fluids having a viscosity of from about 10 to about 100,000 centipoise at 25° C.,b) from 0 to about 40 weight percent of a cyclo-organosiloxanec) from 0 to about 40 weight percent of an inorganic extending or non-reinforcing fillerd) from about 0.5 to about 15 weight percent of an amorphous SiO2reinforcing filler having a surface area of between about 100 to 250 m2/g and a particle size range between about 0.01 and 0.03 microns;e) from about 1 to about 10 weight percent of an oximinosilane cross-linking agentf) from about 0.2 to about 3 weight percent of an adhesion promoterg) from about 0.02 to about 3 weight percent of an organotin salt as a condensation catalyst; andh) from about 20 to about 50 weight percent of alumina trihydrate, the alumina trihydrate having a median particle size of 10 μm to 3 μm, containing 65.1 percent Al2O3, 34.5 percent combined H2O, 0.3 percent Na2O, 0.02 percent CaO, 0.01 percent SiO2and having a specific gravity of 2.42.

REFERENCES:
patent: 5326804 (1994-07-01), Mistry et al.
patent: 01/18134 (2001-03-01), None

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