| 摘要 |
1364865 Coating DULUX AUSTRALIA Ltd 3 Aug 1971 [7 Aug 1970] 36412/71 Heading B2E A paint system which resists blistering under humidities in the region of 100% consists of a metallic substrate to which is adhered a non- convertible coating film consisting of a layer of undercoat and a superimposed layer of paint top-coat such that the undercoat has a water absorption of from 5 to 65% of its dry film weight provided essentially by the incorporation therein of discrete, porous polymer particles. A non-convertible coating film is defined as a resinous film forming material dissolved or dispensed in a volatile liquid (which composition may also be pigmented). The top coat and/or undercoat may include a film-forming material selected from introcellulose, cellulose acetate butyrate, a polymer of methyl methacrylate and a block or graft co-polymer of the condensation product of a dibasic acid or acid anhydride with a polyhydric alcohol and a monobasic fatty acid coreacted in an addition polymerisation reaction with at least one α # ethylenically unsaturated monomer provided also that the weight of fatty acid residues in the copolymer does not exceed about 40% by weight. Comparative examples describe the use of introcellulose modified by additions of adhesion promoter, e.g. poly(methyl methacrylate butyl methacrylate/ acrylic acid) and containing porous particulate polyester resin having 20% voids and diameter 20Á. Other constituents mentioned are cocoanut oil, modified alkyd resins, polystyrene/2 ethyl hexyl acrylate, nbutyl amino hydroxyethyl methacrylate, polyolphthalic anhydride condensates, inorganic compounds such as talc and TiO 2 and organic solvents such as ethanol, toluene and dimethyl ketone. The compositions may be applied conventionally, e.g. to door panels. |
