| 摘要 |
<p>1407254 Epoxy resin compositions WESTINGHOUSE ELECTRIC CORP 11 Sept 1972 [14 Oct 1971] 42031/72 Heading C3B [Also in Division H1] Epoxy resin compositions comprise (by weight): (I) 90-120 parts of a non-glycidyl ether cycloaliphatic or acyclic aliphatic epoxide; (II) 5-120 parts of a glycidyl ether epoxy resin; (III) 5-220 parts of a polycarboxylic anhydride; and as catalyst 0À08-0À9 parts of a quaternary organic phosphonium salt (IV) which has the formula in which R 1 to R 4 are C 1-21 alkyl radicals or aryl radicals and X- is a halogen, propionate, acetate, butyrate, isobutyrate or dimethylphosphate radical. I may be an epoxidized polyester, an epoxidized drying oil or an epoxidized cycloolefin, e.g. 3,4 - epoxycyclohexylmethyl - 3,4- epoxycyclohexane carboxylate. II may be a diglycidyl ether of bisphenol A. II may be hexahydrophthalic anhydride or is 1-methyl homologue, phthalic anhydride or pyromellitic anhydride. The composition may also comprise up to 200 parts by weight of a film of average size 10-300 Á per 100 parts by weight of I plus II. Uses.-Electrical insulation, especially for potting transformers.</p> |
