Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1986-07-02
1988-01-12
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
528 31, 528 32, 525478, C08G 7706
Patent
active
047192755
ABSTRACT:
Polyorganosiloxane gels exhibiting a resistance to discoloration and hardening at temperatures of 100.degree. C. and above can be prepared by the reaction of a polydiorganosiloxane containing silicon-bonded fluorinated hydrocarbon radicals with an organohydrogensiloxane containing at least three silicon-bonded hydrogen atoms per molecule in the presence of a platinium containing catalyst. The resistance to heat induced hardening and discoloration is achieved by preparing the polydiorganosiloxane by the ammonia catalyzed polymerization of at least one cyclic fluorine-containing diorganosiloxane followed by reaction of the resultant silanol terminated polymer with a hexaorganodisilazane containing a vinyl radical bonded to each of the two silicon atoms.
The reactants preferably contain 3,3,3-trifluoropropyl radicals to achieve a resistance to softening and/or solubilization of the cured gel in the presence of hydrocarbon fuels.
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Benditt Kathleen F.
Maxson Myron T.
Dow Corning Corporation
Marquis Melvyn I.
Spector Robert
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