GB759863A - Improvements in polymeric materials and methods of preparing them - Google Patents

Abstract

Polymeric phosphates are prepared by reacting ortho-, meta- or pyro-phosphoric acid or a partial ester thereof with a polymeric epoxide which is a copolymer of an ethylenically-unsaturated epoxy compound and an acyclic ethylenically-unsaturated epoxy-free compound, the polymeric epoxide containing from 3 per cent to 60 per cent of polymerized epoxy monomer and from 97 per cent to 40 per cent of polymerized epoxy-free monomer, the phosphoric acid or partial ester thereof being used in an amount of at least 0.5 mol. per oxirane oxygen atom in the copolymer. The epoxy monomer may be allyl glycidyl ether, glycidyl methacrylate, 4-vinyl cyclohexene oxide, butadiene monoepoxide, glycidyl acrylate, vinyl glycidyl phthalate or allyl glycidyl maleate or phthalate. The epoxy-free monomer may be vinyl acetate or propionate, acrylic acid, methyl or ethyl acrylate, methyl, ethyl, n-propyl or n-butyl mechacrylate, acrylonitrile, methacrylonitrile, acrylamide, methacrylamide, vinyl chloride or fluoride, isobutylene, 1,3-butadiene, isoprene, 1,3 - butadiene, isopropenyl acetate, vinylidene chloride, methyl vinyl ether, acrolein or methyl vinyl ketone. The reaction is preferably effected in an inert solvent such as acetone or dioxane at a temperature below 100 DEG C. The reaction products are soluble in organic solvents such as acetone, and some are soluble in aqueous alkali metal hydroxides, ammonia or amines to form solutions of salts, from which other salts, such as those of aluminium and calcium, may be precipitated. The copper and mercury salts may be used as bactericides or fungicides. The polymeric phosphates may be used as textile sizes, for treating leather and in coating compositions, other ingredients of which may be organic solvents such as acetone, methyl isobutyl ketone and n-butyl alcohol, pigments such as titanium dioxide, carbon black, iron blues, phthalocyanine blues and greens, metal oxides and chromates, extenders such as talc, barytes and china clay, and other film-forming materials such as urea-formaldehyde, melamine-formaldehyde and alkyd resins.ALSO:Surfaces are coated with polymeric phosphates which are the reaction products of copolymers of ethylenically unsaturated epoxy monomers and ethylenically unsaturated epoxy-free monomers with a phosphoric acid (see Group IV(a)). A steel panel was coated with a 30 per cent solution in acetone of the reaction product of orthophosphoric acid and a copolymer of glycidyl methacrylate and methyl methacrylate, and then baked for 45 minutes at 280 DEG F. to form a clear hard film which protected the metal from rusting. A pigmented enamel prepared from 126 parts of the above polymeric phosphate, 251 parts of methyl isobutyl ketone, 35 parts of butyl alcohol, 100 parts of ethylene glycol monoethylether acetate and 100 parts of titanium dioxide was sprayed on a clean metal panel which was baked for 30 minutes at 300 DEG F. to produce a durable white glossy coating. Aqueous solutions of ammonium, amine or alkali metal salts of the polymeric phosphates may be used as clear finishes for wood, glass, ceramics, textiles, paper and metals and may be used either as primer-sealer coats for subsequent application of other finishes or as the total protective or decorative finish; cupric ammonium salts may be used for sealing wood, textile and paper surfaces.