C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
402/17
C08L 83/08 (2006.01) C08G 77/24 (2006.01)
Patent
CA 1281478
HEAT STABLE FLUORINATED POLYORGANOSILOXANE COMPOSITIONS Abstract Polyorganosiloxane gels exhibiting a resistance to discoloration and hardening at temperatures of 100°C and above can be prepared by the reaction of a polydiorgano- siloxane containing silicon-bonded fluorinated hydrocarbon radicals with an organohydrogensiloxane containing at least three silicon-bonded hydrogen atoms per molecule in the presence of a platinum containing catalyst. The resistance to heat induced hardening and discoloration is achieved by preparing the polydiorganosiloxane by the ammonia catalyzed polymarization 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-trifluoro- propyl radicals to achieve a resistance to softening and/or solubilization of the cured gel in the presence of hydrocarbon fuels.
538920
Benditt Kathleen Frances
Maxson Myron T.
Dow Corning Corporation
Gowling Lafleur Henderson Llp
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