| 摘要 |
<p>1,247,422. Coated products. KANSAI PAINT CO. Ltd. 4 Nov., 1969 [7 Nov., 1968], No. 54036/69. Heading B2E. [Also in Division C3] Photocuring coating compositions suitable for application to substrates, such as wood, plastics, paper, glass, steel, cloth, roads or buildings, comprise a solution in a liquid vinyl or vinylidene monomer of an acrylic resin containing ethylenically unsaturated groups produced by (a) half-esterification of an acrylic resin having acid anhydride groups and an ethylenically unsaturated monomer having a hydroxyl group or (b) half-esterification of an acrylic resin having hydroxyl groups and a polymerisable ethylenically unsaturated monomer having an acid anhydride group; said solution having incorporated therein a photo-polymerisation initiator. Suitable photoinitiators include cinnamic, azo, diazo, thiuram, halogen, peroxide, azide, carbonyl and organic phosphorus compounds, photosensitive dyes, and inorganic salts such as uranyl nitrate and cerium nitrate. The coating compositions may additionally include a photocuring accelerator such as anthraquinone, 2- nitrofluorene or 5-nitroacenaphthene, a solid paraffin (to prevent inhibition of polymerisation of the vinyl (idene) monomer by oxygen), and a pigment, e.g. cyanine blue, titanium dioxide or carbon black. Exemplified as the liquid vinyl (idene) monomer are styrene/ethyl acrylate, ethyl acrylate/acrylic acid, methacrylic acid/n-butyl acrylate, a mixture of styrene with partially polymerised #-hydroxy ethyl methacrylate/methyl methacrylate, styrene/nbutyl acrylate, and vinyl toluene/n-butyl methacrylate/divinyl benzene/acrylonitrile. Exemplified as the acrylic resin containing ethylenic unsaturation are (a) maleic anhydride/styrene/ n-butyl acrylate copolymer reacted with #- hydroxy ethyl methacrylate, (b) tetrahydrophthalic anhydride/methyl methacrylate/n-butyl acrylate/acrylic acid copolymer reacted with allyl alcohol, (c) styrene/lauryl methacrylate/ #-hydroxypropyl methacrylate copolymer reacted with maleic anhydride, (d) vinyl toluene/2-ethyl.hexyl acrylate/#-hydroxyethyl acrylate copolymer reacted with endocis-bicyclo- [2, 2, 1]-5-heptene-2, 3-dicarboxylic anhydride, (e) methyl methacrylate/ethyl acrylate/#-hydroxyethyl methacrylate copolymer reacted with maleic anhydride, and (f) styrene/maleic anhydride copolymer reacted with #-hydroxypropyl acrylate. The coating compositions, after application to a substrate, are cured by exposure to a light source (including sources of ultra violet or infra red radiation). The compositions can be utilised in high speed continuous coating processes, e.g. high speed coil coating.</p> |
