Patent GB-1485415-A (GB)
Title: Radiation curable paint composition containing thermoplastic vinyl resin
IPC: B05D3/06
Filed: 1974-07-02
Abstract: 1485415 Radiation polymerizable paint FORD MOTOR CO Ltd 2 July 1974 [2 July 1973] 29314/74 Headings C3P and C3G A paint polymerizable by ionizing radiation containing a paint binder comprises a filmforming solution of an alpha-beta olefinically unsaturated organic resin containing 0À5-5 units of unsaturation per 1000 of the numerical value of the molecular weight and a compound polymeriable with said resin upon exposure to ionizing radiation; and 1-15% by weight, based on the total weight of the paint, of a saturated thermoplastic vinyl polymer having a molecular weight of 10,000-50,000. The term "paint" is defined as including finely divided pigment and/or particulate filler in a filmforming, 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 examples describe the polymerization of a paint containing as (a) α,#- olefinically unsaturated organic resin, a copolymer of methyl methacrylate, ethyl acrylate and glycidyl methacrylate as (b) the polymerizable compound, a mixture of hydroxypropyl acrylate, hydroxyethyl acrylate, isobutyl acrylate and 2-ethyl hexyl acrylate and as (c) saturated polymer: methyl methacrylate copolymer (1, 2); methyl methacrylate/ethyl acrylate copolymer (3, 8, 9, 15); methyl methacrylate/ isobutyl methacrylate copolymer (4, 7); methyl methacrylate homopolymer (5, 6, 11, 13); methyl methacrylate/n-butyl methacrylate (10, 14); n-butyl aorylate/isobutyl methacrylate copolymer (12); methyl methacrylate/ethyl acrylate/methacrylic acid copolymer(16); methyl methacrylate/ethyl acrylate/acrylic acid (17); and various commercial acrylic resins (18). The compositions of Examples 1 to 18 contain titania and silica as pigments and are used to coat wood, plastics and metal, e.g. aluminium. Examples 19, 20 and 25 describe the polymerization of a rubber urethane acrylate resin, an epoxy resin, methyl methacrylate and as the saturated polymer either a methyl methacrylate/ ethyl acrylate copolymer or a methyl methacrylate/n-butyl methacrylate copolymer. Examples 21 and 22 describe the polymerization of (a) an α,# olefinically unsaturated urethane formed from adipic acid, maleic anhydride, hexamethylenediisocyanate and 2-hydroxyethyl acrylate which is diluted with unreacted 2-hydroxyethyl acrylate and butyl acrylate, (b) a mixture of 2-ethyl acrylate and neopentylglycoldiacrylate, and (c) a methyl methacrylate/ ethyl acrylate copolymer. Example 23 describes the polymerization of (a) an unsaturated polyester based on maleic anhydride, tetrahydrophthalic anhydride and neopentyl glycol, (b) styrene and (c) a methyl methacrylate/ethyl acrylate copolymer. Example 24 describes the polymerization of (a) silicone-modified polyester formed from a hydroxyfunctional cyclic polysiloxane, neopentyl glycol, maleic anhydride and tetrahydrophthalic anhydride, (b) styrene and methyl methacrylate, and (c) a methyl methacrylate homopolymer.