Patent GB-1222370-A (GB)
Title: Liquid coating composition
IPC: C09D133/14
Filed: 1967-12-19
Abstract: 1,222,370. Coating compositions. NIPPON PAINT CO. Ltd. 19 Dec., 1967 [27 Dec., 1966], No. 57541/67. Headings C3P and C3R. [Also in Division B2] A liquid coating composition comprises an organic solvent and, as film-forming components, (A) a copolymer consisting of units of (1) 5-50 parts by weight of an ethylenically unsaturated polymerizable monomer having a hydroxyl group and a tertiary aliphatic group, (2) 1-30 parts by weight of another ethylenically unsaturated polymerizable monomer having a hydroxyl group, and (3) 49-90 parts by weight of another ethylenically unsaturated comonomer, and (B) an aminoaldehyde resin, the weight ratio of (A) : (B) being from 65- 95 : 35-5. The composition may also contain (C) up to 50 parts by weight per 100 parts of (A)+(B) of at least one resin selected from vinyl, epoxy, alkyd, oil-free alkyd, polyester, phenol, polyvinylbutyral and silicone resins. A pigment may also be included, if desired, in an amount of 1-200 parts by weight per 100 parts of total film-forming component. Component (1) of the copolymer (A) is suitably a compound of the formula where R 1  is H, C 1 -C 4  alkyl or -COOH, R 2  and R 3  are each H or C 1 -C 4  alkyl and R 4 , R 5  and R 6  are each C 1 -C 22  alkyl, and can be obtained by reacting an appropriate unsaturated carboxylic acid with a suitable glycidyl ester of a tertiary branched chain carboxylic acid, or by reacting an appropriate glycidyl ester of an unsaturated carboxylic acid with a suitable neo-carboxylic acid. The hydroxy component (2) of the copolymer may be a hydroxyalkyl acrylate or methacrylate, N- methylol acrylamide, N-methylolmethacrylamide, allyl alcohol or methallyl alcohol. Suitable as comonomer (3) are alkyl, glycidyl and aminoalkyl acrylates and methacrylates, styrene and methyl-styrenes, vinyl acetate, acrylonitrile, ethylene, butadiene, (meth)acrylamide and N-alkyl- (meth)acrylamides, acrylic acid, methacrylic acid, itaconic acid, maleic acid, maleic anhydride, fumaric acid and crotonic acid. The resin (B) may be a reaction product of an aldehyde, such as formaldehyde, paraformaldehyde, acetaldehyde or benzaldehyde, with urea, melamine, benzoguanamine, dicyandiamide or a triazine derivative, generally alkylated with an alkanol or benzyl alcohol. Pigments specified are titanium dioxide, aluminium flake and a super dispersible blue pigment paste. Other optional components include plasticizers, stabilizers, levelling agents and U.V. absorbers. The solvent used may be toluene, xylene, methyl ethyl ketone, methyl isobutyl ketone, acetone, ethyl acetate, butyl acetate, methanol, ethanol, butanol or ethylene glycol monoethyl ether. The compositions can be prepared by copolymerizing the monomer components of (A) at 70-150 C. in a suitable organic solvent in the presence of a polymerization catalyst, e.g. azobisisobutyronitrile, and optionally a mercaptan chain transfer agent, and then adding the resin (B) and, if desired, pigment (C). In a modification of the preparation, monomer component (1) can be replaced by an appropriate unsaturated carboxylic acid or epoxy monomer, and monomer component (1) is then formed in situ by appropriate reaction of the replacement monomer component during or after the polymerization step. Reference has been directed by the Comptroller to Specification 1,009,217.