Patent GB-963942-A (GB)
Title: Polymeric coatings
IPC: C08F212/04
Filed: 1961-05-26
Abstract: A coating or laminating composition consists of or contains a reactive epoxy compound and a clear, transparent, substantially homogeneous copolymer of at least 75% mole of a vinyl or isopropenyl aromatic compound and up to 25% mole of an anhydride or alkyl, aromatic or glycol monoether partial ester of a di- or tricarboxylic acid having an olefinic linkage alphabeta to a carboxyl group.  The copolymer may contain as a third monomer minor proportions of C1- 8 alkyl acrylates and methacrylates, acrylonitrile, methacrylonitrile or dialkyl fumarates or maleates.  The anhydride and partial ester copolymers are respectively described and claims in Specifications 963,944 and 963,943.  Preferred epoxy compounds are glycidyl polyethers or aromatic polyols having epoxide equivalent weights of 110 to 550; others mentioned are glycidyl polyethers of polyhydric alcohols, e.g. dehydrohalogenated reaction products of at least 2 moles of epihalohydrin with one mole of ethylene glycol or pentaerythritol, epoxides of unsaturated esters and polyesters or diolefines, and mono epoxides such as 3, 4-epoxy-6-methyl-cyclohexylmethyl acetate, 2, 3-epoxy-2-ethylhexanol, allyl-9, 10-epoxystearate, 1, 2-diisobutylene oxide, triisobutylene oxide, styrene oxide, epichlorohydrin, butyl glycidyl ether, butylene, propylene or ethylene oxide, and glycidol.  Curing catalysts such as tertiary amines or their salts, quaternary amine bases or salts, or inorganic bases may be used to shorten the curing time. The compositions are normally employed in solution in organic solvents, e.g. toluene, xylene, methyl ethyl or isobutyl ketone, diacetone alcohol, mesitylene oxide, naphthas and alcohols. Mineral spirits may be used as a diluent.  Optional ingredients specified are reactive modifiers, e.g. epoxy, hydroxy, carboxy, anhydride and mercapto-containing compounds such as polyesters of phthalic or adipic acid with glycol or glycerol, dodecyl succinic anhydride, trimellitic anhydride and liquid mercaptan terminated polysulphide polymers; non-reactive plasticizers and additives e.g. n-butyl stearate, dioctyl diphenyl oxide and tris butyl phenyl phosphate; glass, cellulosic or synthetic fibres; metal and inorganic fillings; and pigments.  Coating and laminating compositions.  In examples the compositions are coated on an aluminium dish and on glass, tin and steel test panels.  In Example XIV glass cloth treated with a Werner type chronium complex is saturated with a solution of a 90/10 dichlorostyrene-maleic anhydride copolymer and commercial epoxy resin in acetone and MEK and twelve plies of the impregnated cloth are laminated under heat and pressure.  Specification 715,666 is referred to.ALSO:A coating or laminating composition consists of or contains a reactive epoxy compound and a clear, transparent, substantially homogeneous copolymer of at least 75 mole per cent of a vinyl or isopropenyl aromatic compound and up to 25 mole per cent of an anhydride or alkyl, aromatic or glycol monoether partial ester of a di- or tri-carboxylic acid having an olefinic linkage alpha-beta to a carboxyl group.  The copolymer may contain as a third monomer mnior proportions of C1-8 alkyl acrylates and methacrylates, acrylonitrile, methacrylonitrile or dialkyl fumarates or maleates.  The anhydride and partial ester copolymers are respectively described and claims in Specifications 963,944 and 963,943.  Preferred epoxy compounds are glycidyl polyethers or aromatic polyols having epoxide equivalent weights of 110-550; others mentioned are glycidyl polyethers of polyhydric alcohols, e.g. dehydrohalogenated reaction products of at least 2 moles of epihalohydrin with one mole of ethylene glycol or pentaerythritol, epoxides of unsaturated esters and polyesters or diolefines, and mono epoxides such as 3,4-epoxy-6-methycyclohexylmethyl acetate, 2,3-epoxy-2-ethylhexanol, allyl-9,10-epoxystearate, 1,2-diisobutylene oxide, tri-isobutylene oxide, styrene oxide, epichlorohydrin, butyl glycidyl ether, butylene, propylene or ethylene oxide, and glycidol.  Curing catalysts such as tertiary amines or their salts, quaternary amine bases or salts, or inorganic bases may be used to shorten the curing time.  The compositions are normally employed in solution in organic p  solvents, e.g. toluene, xylene, methyl ethyl or isobutyl ketone, diacetone alcohol, mesitylene oxide, naphthas and alcohols. Mineral spirits may be used as a diluent.  Optional ingredients specified are reactive modifiers, e.g. epoxy, hydroxy, carboxy, anhydride and mercapto-containing compounds such as polyesters of phthalic or adipic acid with glycol or glycerol, dodecyl succinic anhydride, tri-mellitic anhydride and liquid mercaptan terminated polysulphide polymers; non reactive plasticizers and additives, e.g. n-butyl stearate, dioctyl diphenyl oxide and tris butyl phenyl phosphate; glass, cellulosic or synthetic fibres; metal and inorganic fillings; and pigments.  In examples the compositions are coated on an aluminium dish and on glass, tin and steel test panels.  In Example XIV glass cloth treated with a Werner type chromium complex is saturated with a solution of a 90/10 dichlorostyrenemaleic anhydride copolymer and commercial epoxy resin in acetone and MEK and twelve plies of the impregnated cloth are laminated under heat and pressure. Specification 715,666 also is referred to.