| 摘要 |
1487218 Thermosetting resin composition KAO SOAP CO Ltd 27 Nov 1974 [27 Nov 1973] 51479/74 Heading C3P [Also in Division C2] A thermosetting resin composition which comprises (1) a prepolymer having a terminal vinyl group which prepolymer is obtained by the reaction of a polyepoxide with at least one equivalent, per epoxy group of said polyepoxide, of a dicarboxylic acid half ester of formula wherein R is -CH 2 - or -(CH 2 -CHX-O) n-1 -CH 2 -CHX- in which n is an integer of 1-4 and X is H or CH 3 , R<SP>1</SP> is a divalent aliphatic radical of 2-6 carbon atoms which may be olefinically unsaturated or a divalent aromatic radical which contains 6 or 7 carbon atoms and (2) at least one copolymerizable vinyl monomer (defined) wherein the weight ratio of (1) : (2) is 30 : 99À5 to 70 : 0À5. (2) is preferably styrene, p-chlorostyrene, t-butylstyrene, methylmethacrylate, acrylonitrile, 1-vinyl-2-pyrrolidone, acrylic acid, ethyl acrylate, vinyl acetate or isoprene. A resin article may be made by shaping a solution comprising the thermosetting resin and 0À1- 5-0%, by weight, based on the weight of the half-ester (1) of a peroxide or azobis-based free radical polymerization initiator and curing said shaped article by causing polymerization of the prepolymer composition. In the examples, component (1) is derived from the reaction product of (a) p-(2-hydroxypropyl)styrene/succinic anhydride + epoxy novolac containing epichlorohydrin; (b) o-hydroxyethylstyrene/phthalic anhydride + diglycidyl ether of polypropylene glycol; (c) ethylene glycol-mono[#-(p-vinylphenyl)ethyl]ether/adipic acid + 3,4-epoxycyolohexylmethyl - 3,4 - epoxycyclohexanecarboxylate; (d) p-vinylbenzylalcohol/maleic anhydride +a diglycidyl ether of bisphenol A and component (2) is (a) t-butylstyrene; (b) methyl methacrylate; (c) styrene/methyl methacrylate; or (d) styrene. The compositions may be used to make fibre-glass reinforced sheets.
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