GB1357810A - Homogeneous thermosettable composition of a polyanhydride and a polyepoxide and method of preparation - Google Patents

Abstract

1357810 Polyanhydride/polyepoxide composition GULF RESEARCH & DEVELOPMENT CO 23 Nov 1971 [21 Dec 1970] 54239/71 Headings C3B B1D7 B1N1A B1N6D3 B1N6D5 B1N6D7 B1N13X and B1N16A A non-tacky, thermosettable, mouldable composition is prepared by forming a liquid solution containing (a) a polyanhydride represented by the general Formula:- wherein n is 2 to 500; R 1 and R 2 are independently selected from hydrogen, halogen, alkyl having from one to four carbon atoms and phenyl; R3 is hydrogen, halogen, a straight chain alkyl or halogenated alkyl group having from 1 to 18 carbon atoms phenyl, or a phenyl substituted with one or two chlorine, bromine, methoxy, ethoxy, or lower alkyl groups having from one to four carbon atoms; and R4 is hydrogen, chlorine, bromine or methyl when R 3 is phenyl or substituted phenyl and R4 is hydrogen when R 3 is not phenyl or substituted phenyl; (b) an olefinically unsaturated monooxirane compound containing as its only reactive group a single oxirane group and containing an olefinic double bond capable of being polymerized by free radical means; and optionally (c) an olefinically unsaturated monomer free of oxirane groups and free of reactive groups and containing at least one olefinic double bond capable of polymerization by free radical means; and polymerizing at least a portion of the olefinic double bonds of the monoxirane compound and monomer; if present, by free radical means without substantial reaction of the anhydride groups and the epoxide groups present in the mixture whereby a homogenous mixture of polyanhydride molecules, polyepoxide molecules and any unreacted monooxirane compound and monomer is obtained. In the examples glycidyl methacrylate, methyl methacrylate and styrene are polymerized in a mixture comprising 1-hexenemaleic anhydride copolymer, 2,6-ditertiary butyl-p-cresol, methyl ethyl ketone peroxide in dimethyl phthalate, cobalt naphthenate, powdered calcium carbonate, zinc stearate, glass fibres, ditertiary butyl diperoxy oxalate, cyclohexyl hydroperoxide, benzoyl peroxide, N,N- dimethyl aniline, N,N-dimethyl-p-toluidine and glass cloth. The mixture is formed into a sheet between two polyethylene films; polymerized, separated, cured between two aluminium sheets and then part-cured.