| 摘要 |
<p>A coating composition comprises a solution in an organic solvent of (1) a copolymer of (a) 15 to 50% of a vinyl ester of an aliphatic saturated monocarboxylic acid, (b) 40 to 80% of an alkyl ester of an aliphatic a ,b -ethylenically unsaturated carboxylic acid and (c) 2 to 10% of an aliphatic a ,b -ethylenically unsaturated carboxylic acid and (2) an aminoplast soluble in organic solvents, preferably an ether of a methylol compound of urea or a diamino or triamino 1,3,5-triazine, used advantageously in amount 5 to 30% referred to the copolymer (1). Specified monomers of type (a) are vinyl esters of acids containing 1 to 5 carbon atoms, e.g. formic, propionic and acetic acids. Monomer (b) may be an alkyl ester of an acid containing 3 to 5 carbon atoms, e.g. methacrylic, itaconic, fumaric, crotonic and acrylic acid, the alkyl group preferably being derived from saturated aliphatic alcohols containing 1 to 12 carbon atoms. Examples of such esters are methyl methacrylate, ethyl acrylate, 2-ethylhexy acrylate, dodecyl methacrylate and n-butyl acrylate. Monomer (c) may contain 3 to 5 carbon atoms, e.g. the acids specified in (b). The aminoplast may be an ether derived from aliphatic or alicylic monoalcohols containing 1 to 6 carbon atoms and from methylolated urea or 1,3,5-triazines containing 2 to 3 amino groups, e.g. benzoguanamine, acetoguanamine, formoguanamine and melamine. The methylol compound may contain at least 2 methylol groups and is etherified with 2 to 6 moles of the monoalcohol, e.g. methanol, ethanol, n-propanol, isopropanol, hexanol, cyclohexanol and n-butanol. In examples, ethyl acetate solutions of a mixture of (1) a copolymer of vinyl acetate, n-butyl acrylate and acrylic acid and (2) an n-butanolic solution of a hexamethylolmelamine ether containing 2 to 3 n-butyl ether groups, a di-methylol urea n-butyl ether or an n-butyl ether of methylol benzoguanamine are prepared. The compositions are applied to substrates and cured at 80 DEG to 180 DEG C.ALSO:In a process for coating porous or non-porous substrates a solution in an organic solvent of (1) a copolymer of (a) 15 to 50% of a vinyl ester of an aliphatic saturated monocarboxylic acid (b) 40 to 80% of an alkyl ester of an alphatic a ,b -ethylenically unsaturated acid and (c) 2 to 10% of an aliphatic a ,b -ethylenically unsaturated acid and (2) an aminoplast soluble in organic solvents, preferably an ether of a methylol compound of urea or a diamino or triamino 1, 3, 5-triazine the said aminoplast being advantageously used in amount 5 to 30% referred to the copolymer (1) is applied to a substrate and the coated substrate is dried and then cured at 80 DEG to 180 DEG C. Substrates specified are fabrics e.g. nylon, paper, leather, glass, building materials and wood. The coating is applied with a brush or a spraying device, or by dipping and subsequent expression, or with the aid of a coating machine, preferably with a doctor device. The composition may also contain fillers, pigments or plasticizers.</p> |
