Patent GB-1476380-A (GB)
Title: Radiation polymerisable paint
IPC: C09D4/06
Filed: 1974-07-05
Abstract: 1476380 Radiation polymerizable paint FORD MOTOR CO Ltd 5 July 1974 [5 July 1973] 29973/74 Headings C3G and C3P A paint polymerizable by ionizing radiation comprises a paint binder comprising a filmforming solution of an α,#-olefinically unsaturated organic resin containing 0À5-5 units of unsaturation per 1000 of the numerical value of the molecular weight and a compound polymerizable with said resin upon exposure to ionizing radiation, and 0À5-5 wt. per cent based on the total weight of the paint of a zinc salt of an α,#-monounsaturated carboxylic acid. The term "paint" is defined as including finely divided pigment and/or particulate filler, e.g. titania or silica in a film-forming, resin comprising, binder or the binder without pigment and/or particulate filler. The ionizing radiation is preferably electron-beam radiation, and the paints may be polymerized in situ on the substrate, particularly aluminium and steel. The specific examples describe the polymerization of (a) an unsaturated resin formed from methylmethacrylate, ethyl acrylate, glycidyl methacrylate and methacrylic acid and (b) a monomer mixture of methyl methacrylate, isobutyl methacrylate, acrylic acid and either zinc diacrylate or zinc dimethacrylate (1, 2, 3, 4); (a) resin formed from styrene, ethyl acrylate, glycidyl methacrylate and methacrylic acid and (b) monomer mixture of methyl methacrylate, isobutyl methacrylate, acrylic acid and zinc diacrylate (5); (a) resin formed from methylmethacrylate, butyl acrylate, glycidyl methacrylate and methacrylic acid and (b) monomer mixture of methyl methacrylate, isobutyl methacrylate, acrylic acid and zinc diacrylate (6); (a) resin formed from methyl methacrylate, ethyl acrylate, glycidyl methacrylate, and methacrylic acid and (b) monomer mixture of methyl methacrylate, 2-ethyl hexylacrylate, isobutyl acrylate, acrylic acid and either zinc diacrylate, zinc dimethacrylate, zinc dicrotonate or zinc dicinnamate (7, 8, 9, 10); (a) a resin formed from methyl methacrylate, ethyl acrylate, glycidyl methacrylate and (b) monomer mixture of methyl methacrylate, 2-ethylhexyl acrylate, isobutyl acrylate and either zinc diacrylate, zinc dimethacrylate and zinc dicrotonate (11, 12, 13). Examples 14 and 15 refer to polymerization of an unsaturated polyester based on maleic anhydride, tetrahydrophthalic anhydride and neopentyl glycol and styrene in the presence of zinc dimethacrylate and zinc dicrotonate; Examples 16 to 18 the polymerization of a silicone-modified polyester formed from: hydroxyfunctional cyclic polysiloxane, neopentyl glycol, maleic anhydride and tetrahydrophthalic anhydride, styrene and methyl methacrylate in the presence of zinc diacrylate, zinc dimethacrylate and zinc dicinnamate. Example 19 describes the polymerization of a rubber urethane acrylate resin, an unsaturated epoxide, methyl methacrylate and zinc dimethacrylate whilst Examples 20, 21 and 22 describe the polymerization of an α,#-olefinically unsaturated urethane formed from: adipic acid, maleic anhydride, neopentyl glycol, hexamethylene diisocyanate and 2-hydroxyethyl acrylate, 2-ethyl hexyl acrylate, neopentyl glycol diacrylate and either zinc diacrylate, zinc dimethacrylate or zinc dicinnamate.