Patent GB-1001670-A (GB)
Title: Stoving finishes
IPC: C09D133/26
Filed: 1963-03-05
Abstract: Stoving, coating compositions comprise (a) a polymer or copolymer of acrylamide or methacrylamide in which the amido hydrogen atoms are replaced by the group -CH2OH modified by at least partial etherification with an alcohol of 1 to 4 carbon atoms, and (b) 5 to 40% by weight of the total weight of components (a) and (b) of a polyether-ester containing hydroxyl groups which has been obtained from a 1,2-epoxy compound having a 1,2-epoxide equivalence greater than 1 by partially etherifying the 1,2-epoxide groups with a monophenol in a first stage, and by esterifying the residual 1,2-epoxide groups in the reaction product obtained with a monocarboxylic acid in a second stage. The compositions may also contain organic diluents or solvents, such as butanol, xylene, pine oil, methyl isobutyl ketone and cyclohexanone or mixtures thereof; pigments such as titanium dioxide and lampblack; acid catalysts such as citric, tartaric and phosphoric acids; flow control agents such as silicone oils and other conventional additives.  The (meth)-acrylamide may be copolymerized with alkyl acrylates, acrylic acid, styrene and/or alkylstyrenes. Many epoxy resins are specified including monomeric, telomeric and polymeric compounds.  Monophenols specified are phenol, and cresols, xylenols, guaiacol, naphthols, chlorophenols, p-t-butylphenol, p-t-octylphenol and p-t-nonylphenol. Many monocarboxylic acids are specified including alkanoic acids, unsaturated fatty acids, crotonic acid, lactic acid, cycloaliphatic acids, araliphatic acids and aromatic acids.  Copolymers of acrylamide with (1) styrene and butyl acrylate, and (2) styrene, 2-ethyl-hexyl acrylate and methyl acrylate are prepared in butanol solution using cumene hydroperoxide in the presence of dodecyl mercaptan.  The copolymers are then reacted with formaldehyde in butanol in the presence of maleic anhydride.  Polyether-esters are also prepared in the examples using alcoholic KOH as catalyst for the etherification and benzyldimethylamine or no additional catalyst for the esterification, from: a diglycidyl ether of bis-phenol A and p-t-octylphenol and benzoic acid, crotonic acid or benzoic acid and acetic acid, lauric acid or hydrogenated rosin; p-t-butylphenol, p-nonylphenol, phenol or p-cresol, and benzoic acid; or p-nonyl-phenol and crotonic acid; and from: 3,4-epoxyhexahydrobenzal 31,41-epoxy - 11,11 -bishydroxymethylcyclohexane, 1,4 - butanediol diglycidyl ether or epoxidized tetrabutenylated toluene, and p-t-octylphenol and benzoic acid.ALSO:Stoving, coating compositions comprising an at least partially etherified, methylolated (meth)acrylamide polymer or copolymer, a polyether-ester containing hydroxyl groups obtained by etherifying some of the epoxy groups of a polyepoxide with a monophenol and esterifying the residual epoxy groups in the product with a monocarboxylic acid, and a solvent are applied by means of a spray gun to sheet iron or aluminium and stoved at 180  DEG C.  The compositions may comprise pigments, flow control agents, acid catalysts, germ killers and/or flame inhibitors.  The stoving finishes may be used on motor car bodies, refrigerators, air conditioning plants, heating installations and washing installations. Specification 842,641 is referred to.