GB844978A - Improvements in or relating to the curing of glycidyl polyethers - Google Patents

Abstract

A glycidyl polyether containing more than one epoxide group per molecule and having a weight per epoxide below 1,000 is reacted with a polybasic acid anhydride and a polyhydroxy polymer containing 0,5 to 25% by weight of hydroxyl groups selected from alkenol homopolymers, hydrolised alkenyl alkanoate homopolymers, hydroxy alkyl alkenoate homopolymers and co-polymers of monomers of said homopolymers with vinyl compounds containing a single polymerizable H2C=C < group, where the anhydride and the glycidyl polyether are used in an equivalent ratio of 0,5 to 1 to 4:1 and polymer is used in an amount of from 0,5 to 80% by weight of the composition. Specified glycidyl polyethers include those made by reacting polyhydric alcohols or phenols e.g. resorcinol, hydroquinone, bis-phenol, catechol and glycerol with epihalohydrins e.g. 3-chloro-1, 2-epoxybutane, 3-bromo-1, 2-epoxyhexane and 3-chloro-1, 2-epoxyoctane or glycidyl polyethers. Specified polybasic acid anhydrides include succinic, maleic, pyromellitic, Chlorendic and Nadic anhydrides. Specified polyhydroxy polymers include co-polymers of allyl alcohol with styrene, vinylidene chloride, acrylonitrile and methallyl chloride, hydrolised polyvinyl acetate and hydrolised co-polymers of ethylene chloride and vinyl acetate, vinyl acetate and vinyl chloride, methyl methacrylate and vinyl acetate and vinyl acetate and styrene. The reaction may be effected in a solvent e.g. p acetone, methyl ethyl ketone, methyl isobutyl ketone, di-isobutyl ketone, "Cellosolve" (Registered Trade Mark) acetate and mixtures thereof with xylene, toluene or benzene. Catalysts specified for the reaction are tertiary amines, amine salts or quaternary ammonium hydroxides and peroxide or hydroperoxide polymerization catalysts. Exemplified glycidyl polyethers are made from bis-phenol or resorcinol and epichlorohydrin. Exemplified polyhydroxy polymers are copolymers of styrene and hydroxypropyl acrylate, terpolymers of styrene, methyl acrylate and hydroxy propyl acrylate, co-polymers of vinyl toluene and hydroxypropyl acrylate, co-polymers of vinyl toluene and hydroxypropyl methacrylate, co-polymers of styrene and the acrylic acid ester of phenyl glycidyl ether and co-polymers of vinyl acetate and hydroxypropyl crotonate. U.S.A. Specifications 2,581,464, 2,582,985, 2,615,007 and 2,615,008 are referred to.