| 摘要 |
<p>1,197,925. Coating. PENNSALT CHEMICALS CORP. 16 Oct., 1967 [23 Nov., 1966], No. 46982/67. Heading B2K. A substrate is coated with a pigmented primer layer containing an acrylic polymer composed of (a) from 40 to 80% of an ester of acrylic acid with a C 1 -C 18 primary alkanol, (b) from 18 to 59.5% of at least one C 1 -C 6 alkyl methacrylate, and (c) from 0.5 to 2.0% of one or more alpha, beta-unsaturated carboxylic acids, and a clear top layer containing a fluorinated copolymer composed of 60 to 95% vinylidene fluoride and 40 to 5% of tetrafluoroethylene or perfluoropropene. The substrate may be of wood, metal such as aluminium. Examples of acrylic polymers are butyl acrylate-methyl methacrylate-acrylic acid, ethylacrylate-methylmethacrylate-acrylic acid-methacrylic acid, ethylacrylatetertiary-butyl methacrylateitaconic acid, butyl acrylate-methyl methacrylate-methacrylic acid, ethyl acrylate-methyl methacrylate-methacrylic acid copolymers. Examples of other acrylic acid esters, alkyl methacrylates and alpha, betaunsaturated cardboxylic acids are given. The pigments may comprise titanium dioxide, whiting, talc, magnesium silicate, mica, phthalocyanines, chrome oxide, iron.</p> |
