Patent GB-989505-A (GB)
Title: Vinyl plastisol
IPC: C08K5/3492
Filed: 1962-09-20
Abstract: Plastisol compositions comprise in admixture a vinyl chloride polymer resin containing at least 70% by weight of vinyl chloride units, a liquid plasticizer, a polyepoxide and a melamine compound of formula <FORM:0989505/C3/1> where R and R1 may be the same or different and are each hydrogen or a hydrocarbon group having 1 to 8 carbon atoms. Specified vinyl chloride polymers are polyvinyl chloride, and copolymers of vinyl chloride with vinyl, allyl and isopropenyl esters; vinyl and allyl ethers; olefins and vinyl and isopropenyl aromatic compounds; esters of acrylic, methacrylic, maleic and fumaric acids; acrylonitrile, methacrylonitrile and vinylidene cyanide; vinyl, vinylene and vinylidene halides and trifluoroethylene; many suitable comonomers being listed.  Many suitable polyepoxides are listed, including vinyl cyclohexene dioxide; butadiene dioxide; diepoxypropoxy-, diepoxybutoxy- and diepoxypentoxy-substituted hydrocarbons and chlorohydrocarbons; diglycidly ether; reaction products of glycidol with diisocyanates; epoxidized glycerides; glycidyl esters of polycarboxylic acids; glycidyl ethers of polyhydric phenols; addition polymers and copolymers of ethylenically unsaturated compounds such as vinyl and allyl glycidyl ethers and glycidyloxy styrene; and reaction products of epichlorhydrin with dihydric phenols. Many suitable melamine compounds are listed including melamine, methyl-, ethylpropyl-, isopropyl-, butyl-, octyl-, dimethyl-, methylethyl-, ethylisopropyl-, ethyliso-octyl-, dioctyl-, methylcyclohexyl-, allyl-, diallyl-, allyl - t. - butyl -, methylvinyl -, ethyloctenyl-, allylhexenyl-, and allylmethallyl-melamines. The plastisol compositions may also comprise pigments, fillers and stabilizers, e.g. basic lead carbonate, dibasic lead phosphite, dibasic lead phthalate, tribasic lead sulphate, lead salicylate, lead stearate, dibasic lead stearate, tribasic lead maleate and basic lead silicate. They may be used for coating metals, glass, ceramics, wood, leather and fabrics, and the coatings cured by heating.  Examples describe plastisol compositions comprising polyvinyl chloride, a condensate of epichlorhydrin with 4,41-dihydroxydiphenylpropane, dioctyl adipate, basic lead carbonate and (I, II and IV) diallyl melamine and (III) dimethyl-, diethyl-, diisopropyl-, di-n-propyl- or diallyl-melamine. Comparative compositions in which the malamine compound is replaced by (I) m- or o-phenylenediamine, b -naphthylamine, benzidine or p-phenylene diamine, or (IV) boron trifluoride-ethylamine complex or N-methyl p-phenylenediamine are described.ALSO:Substrates may be coated with heat curable plastisol compositions comprising a vinyl chloride polymer containing at least 70% by weight of vinyl chloride units, a liquid plasticizer; a polyepoxide and a melamine compound of formula <FORM:0989505/B1-B2/1> where R and R1 may be the same or different and are each hydrogen or a hydrocarbon group having 1-8 carbon atoms. Specified substrates are metals, glass, ceramics, wood, leather and fabrics of synthetic and natural fibres.  Metals, e.g. iron, steel, galvanized steel, stainless steel, aluminium, magnesium, tin plate, copper and brass, are preferred.  Specified vinyl chloride polymers are polyvinyl chloride and copolymers of vinyl chloride with vinyl, allyl and isopropenyl esters; vinyl and allyl ethers; olefins and vinyl and isopropenyl aromatic compounds; acrylic, methacrylic, maleic and fumaric esters; acrylonitrile, methacrylonitrile and vinylidene cyanide; and halogen-substituted ethylenes.  The polyepoxide may be vinyl cyclohexene dioxide; butadiene dioxide; a diepoxypropoxy-, diepoxybutoxy- or diepoxypentoxy-hydrocarbon or chlorohydrocarbon; diglycidyl ether; reaction product of glycidol with a diisocyanate; epoxidized glyceride; glycidyl ester of a polycarboxylic acid; glycidyl ether of a polyhydric phenol; addition polymer or copolymer of an ethylenically unsaturated compound; or reaction product of epichlorhydrin with a dihydric phenol.  Many suitable melamine compounds are listed, including melamine and methyl-, ethyl-, propyl-, isopropyl-, butyl-, octyl-, dimethyl-, methylethyl-, ethylisopropyl-, ethylisooctyl-, dioctyl-, methylcyclohexyl-, allyl-, diallyl-, allyl-t-butyl-, methylvinyl-, ethyloctenyl-, allylhexenyl- and allylmethallyl-melamines.  The plastisol compositions may also include pigments, fillers and stabilizers.  In examples, plastisol compositions comprising polyvinyl chloride, a condensate of epichlorhydrin and 4,41-dihydroxydiphenylpropane, dioctyl adipate and basic lead carbonate together with diallyl melamine are used to coat by means of a draw bar (I) degreased iron panels, (II) chromic acid treated steel, zinc phosphate treated steel, galvanized steel, aluminium and brass, and (IV) degreased steel panels; and together with diallyl melamine, dimethyl melamine, diethyl melamine, di-n-propyl melamine or diisopropyl melamine are used to coat (III) steel panels.