Patent GB-943217-A (GB)
Title: Coating compositions
Inventor: GASKE JOSEPH E
IPC: C09D163/00
Filed: 1960-03-31
Abstract: A coating composition comprises a solution in a volatile liquid of an acrylic copolymer which is the reaction product of from 3 to 20 parts by weight of acrylic or methacrylic acid or a mixture of those acids and correspondingly 97 to 80 parts by weight of an alkyl ester of either or both of the acids having at least one alkyl radical of the formula CnH2n+1 in which n is 1-8, and an epoxy compound which contains at least one 1-2 epoxy group and which is present in an amount sufficient to supply from 21.5 to 151 1-2 epoxy groups per 100 carboxylic acid groups of the acrylic copolymer.  When the ester is other than 2-ethyl hexyl acrylate or a mixture of 2-ethyl hexyl acrylate and another alkyl acrylate or methacrylate, the composition also includes dicyandiamide as curing catalyst.  Other esters from which the copolymer may be derived include methyl, ethyl and butyl acrylate and methyl and ethyl methacrylate.  The epoxy compound may be a condensation product of bisphenol A and epichlorohydrin, 3,4-epoxy-6-methylcyclohexylmethy -3,4-epoxy-6-methyl-cyclohexanecarboxylate, butadiene dioxide, 1,2-epoxy -2,4,4-trimethylpentane, styrene oxide, vinylcyclohexene dioxide, vinylcyclohexene monoxide, 1,4-butanediol diglycidyl ether, phenyl glycidyl ether, butyl glycidyl ether, propylene oxide, a reaction product of epichlorohydrin with the reaction product of 3 moles of phenol with 1 mole of acrolein, or a poly(alkyl glycidyl ether).  The volatile liquid may be xylene with which may be incorporated ethanol, butanol and methyl isobutyl carbinol.  Other ingredients which may be present are cellulose acetate butyrate, petrolatum, polyethylene wax and titanium dioxide.  After application coatings may be cured by heating, and compositions containing copolymers comprising 2-ethyl-hexyl-acrylate may include curing catalysts such as tertiary amines, fatty quaternary amines, 2,4,6-tri(dimethylaminomethyl) phenol, potassium hydroxide, quaternary amine hydrochlorides, dicyandiamide, morpholine, N-methyl morpholine, N-ethyl morpholine, morpholine fatty acid soaps, dimethyl p-toluidine, trilaurylamine, piperidine N-pentamethylene-dithiocarbamate, stearic hydrazide or a urea or melamine resin.ALSO:Sheets of iron, steel, or "Bonderized" (Registered Trade Mark) steel may be coated by spraying a coating composition comprising a solution in a volatile liquid of an acrylic copolymer which is the reaction product of from 3 to 20 parts by weight of acrylic or methacrylic acid or a mixture of those acids and correspondingly 97 to 80 parts by weight of an alkyl ester of either or both of the acids having at least one alkyl radical of the formula CnH2n+1 in which n is 1-8, and an epoxy compound which contains at least one 1-2 epoxy group and which is present in an amount sufficient to supply from 21,5 to 151 1-2 epoxy groups per 100 carboxylic acid groups of the acrylic copolymer (see Division C3). The volatile liquid may be xylene with which may be incorporated ethanol, butanol and methyl isobutyl carbinol.  The coatings may be cured by heating after application.