| 摘要 |
1,131,920. Coating. P.P.G. INDUSTRIES, Inc. 5 July, 1966, No. 30114/66. Headings B2E and B2K. [Also in Division C3] Compositions suitable for providing heatcurable coatings on substrates such as glass, wood, hardboard, plastics and metals, e.g. steel, treated steel or aluminium, comprise a solvent and, as essential film-forming component, an interpolymer of (a) 2-25 mole per cent of a hydroxyalkyl ester of an ethylenically unsaturated carboxylic acid (b) 0.1-20 mole per cent of an ethylenically unsaturated carboxylic acid and (c) at least one ethylenically unsaturated comonomer, the composition containing at least 0.1 per cent by weight, based on the weight of the interpolymer, of polymerised carboxylic acid units which have been reacted with an alkylenimine or substituted alkylenimine. In a modification, the iminated carboxylic acid units are present in a separate polymer which is blended with the hydroxyalkyl ester interpolymer. The composition may include an additional resinous component which is coreactive with the interpolymer to form cross-links. Such resins include aminealdehyde products which may be etherified, alkyd resins, polyepoxides, epoxy esters, vinyl halide polymers, cellulosic polymers, polysiloxanes and phenolic resins. A pigment, e.g. carbon black or phthalocyanine blue, may be included; other additives include acrylic polymers, p-phenylene diamine, mono- or di-nbutyl phosphate, additional solvents, plasticisers and fillers. The coatings are preferably applied by spraying and can be cured by baking at 150-300‹F for 10-40 minutes. |
