| 摘要 |
1313652 Novel acrylic copolymers; coating compositions CANADIAN INDUSTRIES Ltd 15 June 1970 [30 June 1969] 32825/69 Headings C3F and C3P Novel acrylic copolymers comprise the reaction product of (1) a copolymer containing units of methyl methacrylate and glycidyl acrylate or methacrylate and (2) lauric acid, pyruvic acid or an amino-substituted alkanoic acid (e.g. 4- aminobutyric acid or 11-aminoundecanoic acid). The copolymer (1) may also contain units of further monomer, e.g. other alkyl (meth)acrylates, vinyl acetate, acrylonitrile and styrene. Those novel copolymers derived from a component (1) containing at least 75% by weight of methyl methacrylate units and 0À5-25% by weight of glycidyl (meth)acrylate units are useful in coating compositions comprising an organic solvent and, as film-forming material, (a) at least 40 parts by weight of (i) said novel copolymer or (ii) a mixture of such copolymer with polymethyl methacrylate or a copolymer of methyl methacrylate and a comonomer which is inert towards the esterified glycidyl moiety of the novel copolymer; (b) 0-50 parts by weight of at least one compatible plasticizer; and (3) 0-35 parts by weight of cellulose acetate butyrate, the total parts by weight of film-forming material being 100. Suitable comonomers for the optional methyl methacrylate copolymer in (ii) are alkyl (meth)- acrylates, vinyl acetate, acrylonitrile and styrene. Preferred plasticizers are oil-free polyesters, e.g. an oil-free polyester derived from neopentyl glycol, adipic acid, phthalic anhydride and butyl alcohol; and coconut oil-modified and acid-modified alkyd resins. Other useful plasticizers include phthalate and phosphate esters. Useful solvents include aromatic hydrocarbons, aliphatic or cycloaliphatic ketones, amyl alcohol and ethylene dichloride. The compositions may also include pigments, e.g. metal oxide and salt pigments, carbon black, metal flakes, and organic dyestuffs and lakes. The compositions can be applied to substrates, e.g. primed steel surfaces, and baked at 200- 300‹ F. |
