Patent GB-1247522-A (GB)
Title: Production of copolymer-based coating compositions
IPC: C08F265/06
Filed: 1968-11-22
Abstract: 1,247,522. Coatings. BADISCHE ANILIN & SODA-FABRIK A.G. 22 Nov., 1968 [24 Nov., 1967], No. 55442/68. Heading B2E. [Also in Division C3] Surface coating compositions having a high binder content and which are suitable for application to materials, such as wood, ceramics, plastics, glass and iron, aluminium, magnesium and alloys of these metals, are produced by polymerising in an organic liquid, in the presence of a free radical polymerisation initiator, a mixture (I) of: (A) 50 to 95% by weight of at least one copolymerizable ester of a monoolefinically unsaturated carboxylic acid having three to five carbon atoms and an alcohol having one to four carbon atoms, (B) 0.75 to 25% by weight of an N-methylolamide of a copolymerizable olefinically unsaturated carboxylic acid having three to five carbon atoms, which amide has been etherifled with an alcohol having one to eight carbon atoms, and (C) 0.5 to 40% by weight of at least one further copolymerizable monoolefinically unsaturated monomer other than a monomer of type (A) or (B), the sum of the percentages of (A), (B) and (C) being 100, and the components of the mixture (I) being selected so that a copolymer formed therefrom is substantially insoluble in the organic liquid; there being dissolved in the organic liquid, in an amount from 10 to 200% by weight with reference to the mixture (I), a copolymer (II) which contains polymerized units of: (A) 50 to 97% by weight of at least one copolymerizable ester of a monoolefinically unsaturated carboxylic acid having three to five carbon atoms and an alcohol having four to eighteen carbon atoms, (B) 2 to 49.5% by weight of an N-methylolamide of a copolymerizable olefinically unsaturated carboxylic acid having three to five carbon atoms, which amide has been etherified with an alcohol having one to eight carbon atoms, and (C) 0.5 to 48% by weight of at least one further copolymerizable monoolefinically unsaturated monomer other than a monomer of type (A) or (B), the sum of the percentages of (A), (B) and (C) being 100; the organic liquid containing at least 20% by weight of one or more aliphatic or hydroaromatic hydrocarbons; and the ratio of the sum of the weights of mixture (I) and copolymer (II) to the weight of the organic liquid being in the range from 1:4 to 4:1. Component (C) of (I) may be a vinyl carboxylate ester, a mono- (meth) acrylate ester of an alkanediol or oxaalkanediol, (meth) acrylamide, (meth) acrylonitrile, an N-vinyl heterocyclic compound, styrene, vinyl toluene or (meth) acrylic acid. In addition to the hydrocarbon component, the organic liquid may also comprise ketones, ethers, alcohols and esters. The compositions may additionally include aminoplast precondensates, e.g. of formaldehyde with urea, melamine or benzoguanamine, and also minor amounts of additives such as epoxy resins, phenol resins, alkyd resins, pigments, dyes, curing accelerators, e.g. p-toluene sulphonic acid, and flow-improving agents. The compositions can be applied to household articles, automobile parts and medical apparatus by methods such as dipping, pouring, spraying, brushing and rolling. Coatings obtained can be cured by baking at 100- 150C.