Patent GB-1220786-A (GB)
Title: Graft polymers containing epoxide groups
Inventor: WAGNER KUNO
IPC: C08G59/14
Filed: 1969-05-28
Abstract: 1,220,786. Grafted epoxy resins. FARBENFABRIKEN BAYER AG.. 28 May, 1969 [12 June, 1968], No. 26889/69. Heading C3G. A graft polymer is prepared in the presence of free radicals from at least one ethylenically unsaturated-monomer and a graft base which is an optionally modified epoxidic compound with more than one epoxy group and at least one alcoholic hydroxyl group per molecule, at least 5% of the alcoholic hydroxyl groups being esterified by at least one monoisocyanate, said epoxidic compound being derived from a polyhydric phenol, a polyhydric alcohol, aniline, 4,4<SP>1</SP> - bis - (N - methylamino) - diphenylmethane or an olefinically unsaturated compound. The epoxide compound may be modified with a polyamine, cyclic carboxylic acid anhydride, carboxylic acid, polyalcohol, phenol-urea or melamine-aldehyde resin, or a diisocyanate as well as the monoisocyanate. In the examples an epoxy resin derived from bisphenol-A and epichlorohydrin is (i) modified with methoxymethyl isocyanate and grafted with vinyl acetate; (ii) modified with methoxymethyl isocyanate or methyl isocyanate and grafted with methyl methacrylate and acrylic acid; (iii) simultaneously modified with methoxymethyl isocyanate and grafted with (a) methyl acrylate and allyl glycidyl ether, (b) ethyl acrylate and N - methylolmethacrylamide methyl ether, (c) n-butyl acrylate and 2-hydroxypropyl methacrylate or (d) ethyl acrylate, acrylamide and styrene; (iv) modified with methoxymethyl isocyanate and grafted with (a) methyl methacrylate, acrylonitrile and acrylic acid (b) methyl methacrylate, methyl acrylate and acrylic acid (c) methyl methacrylate and methacrylic acid ethyl ester isocyanate (d) styrene, methyl methacrylate and acrylic acid (e) methyl methacrylate and acrylic acid, with further addition of methoxymethyl isocyanate and methyl methacrylate during grafting; (v) modified with methoxymethyl isocyanate and grafted with (a) ethyl acrylate and acrylic acid or (b) styrene, acrylonitrile and acrylic acid; (vi) modified with cyclohexyl isocyanate and grafted with (a) methyl methacrylate and acrylic acid (b) methyl methacrylate, n-butylacrylate and acrylic acid (c) methyl methacrylate, vinylacetate and acrylic acid (d) styrene and maleic anhydride or (e) methyl methacrylate, glycidyl methacrylate and, optionally, methacrylic acid ethyl ester isocyanate; (vii) modified with stearyl isocyanate and grafted with methyl methacrylate, and acrylic acid; (viii) modified with methoxymethyl isocyanate and grafted with ethyl methacrylate, or methyl methacrylate, and acrylic acid; in addition, an epoxy resin derived from bisphenol-A, epichlorohydrin and the glycidyl ethers of o- and p-tert.butyl phenols is modified with methoxymethyl isocyanate and grafted with methyl methacrylate and acrylic acid and a bisphenol-A/epichlorohydrin resin is modified with hexamethylene diamine prior to being reacted with methoxymethyl isocyanate and grafted with methyl methacrylate and glycidyl methacrylate. The graft polymers are cross-linked alone or with an agent such as hexahydrophthalic acid anhydride and, optionally, ungrafted epoxidic compound.