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US 4,542,226 AGranted
Method for making siloxanenorbornane bisanhydride
AssigneeGeneral Electric Company
InventorsVictoria J. Eddy, John E. Hallgren
Life of this patent
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Abstract
A method is provided for making siloxanenorbornane bisanhydride. Norbornane anhydride is initially hydrosilylated with dimethylchlorosilane in the presence of a platinum catalyst. The resulting dimethylchlorosilyl norbornane anhydride is thereafter hydrolyzed while in the molten state.
Claims3
A method for making silylnorbornane dianhydride of the formula ##STR2## which comprises (1) hydrosilylating 5-norbornene-2,3-carboxylic anhydride with dimethylchlorosilane in the presence of an effective amount of a platinum catalyst and an organic solvent;
- (2) vacuum distilling the mixture of (1) to recover 5-dimethylchlorosilyl-norbornane-2,3-dicarboxylic anhydride;
- (3) hydrolyzing the 5-dimethylchlorosilyl-norbornane 2,3-dicarboxylic anhydride at a temperature in the range of from about 100.degree.-180.degree. C. and
- (4) stripping the mixture of (3) under reduced pressure.
Dependencies are inferred from the claim text.