Patent GB-952991-A (GB)
Title: Coating compositions
IPC: B32B27/00
Filed: 1960-05-24
Abstract: A curable mixture for coating metal surfaces comprises a film-forming vinyl chloride resin and at least 1% by weight thereof of a mixture of an amino-organosilicon compound having at least 3 C atoms between N and Si and an epoxy compound in amounts providing 0.05 to 5 epoxy equivalents per aminohydrogen equivalent together with a solvent for the resin. Up to 30% of the mixture may be used. Specified resins are vinyl chloride homopolymer and copolymers with vinyl acetate or benzoate, part hydrolysed vinyl acetate, alkyl acrylates, methacrylates, maleates and fumarates, acrylonitrile, vinylidene chloride and fluoride, vinyl fluoride and chlorotrifluoroethylene The resin may contain 0 to 100% by weight of pigment, 0 to 40% plasticizer and 0 to 5% stabilizer. The solvent may be a mixture of polar solvent, e.g. ketones, ethers, nitroparaffins and chlorinated solvents, and diluent solvents, e.g. aromatic and aliphatic hydrocarbons.  The amino-organosilicon compounds may have the formula R1-NH-R-Si-X3 where R is a C3+ divalent hydrocarbon group; R1 is H or a monovalent organic group e.g. cyanoalkyl, aminoalkyl or R-Si-X3; and X is a hydrocarbon, halogenated hydrocarbon, alkoxy, hydroxy, -NHR-, or -O-Sigroup or system. Various mono- and poly-epoxides may be used, an extensive list of examples including hydrocarbon epoxides, glycidyl ethers, epoxy carboxylates, esters and ethers and reaction products of halohydrins and polyhydric phenols. Specific materials used in the various specific examples include: Resins: polyvinyl chloride; and vinyl chloride-vinyl acetate copolymer and terpolymer with maleic anhydride or vinyl alcohol. Amino-organosilicon-epoxy mixtures: gamma-amino-propyltriethoxysilanephenyl-, vinyl- or amyltriethoxysilane/diglycidyl ether of 4,41-dihydroxydiphenyl-2, 2-propane; and a similar mixture having part of the phenyltriethoxysilane replaced by dimethyldiethoxysilane; Solvents: MiK and toluene; ethylene glycol methyl ether and toluene with or without diiso-butyl ketone and/or a commercial aromatic hydrocarbon mixture; Optionalsaluminium powder, dioctylphthalate, titanium dioxide, antimony oxide, tritolylphosphate and an organo-tin stabilizer. Coating metals  The composition is applied to and cured on a metal surface which need not be clean but may be dirty, oily, rusted, oxidized, tarnished or corroded. The metal may be Sn, Al, Cu, Zn, Fe, Mg, Ni, Pb or Ag or a plating, e.g. copper, tin, silver or chromium plate, or an alloy or mixture, e.g. steel, brass or bronze. The composition may be used as a primer coat.  Specifications 952,992, 952,993, 952,994 and 952,995 are referred to.ALSO:A curable mixture for coating metal surfaces comprises a film-forming vinyl chloride resin and at least 1% by weight thereof of a mixture of an amino-organosilicon compound having at least 3 C atoms between N and Si and an epoxy compound in amounts providing 0,05-5 epoxy equivalents per aminohydrogen equivalent together with a solvent for the resin.  Up to 30% of the mixture may be used.  Specified resins are vinyl chloride homopolymer and copolymers with vinyl acetate or benzoate, part hydrolyzed vinyl acetate, alkyl acrylates, methacrylates, maleates and fumarates, acrylonitrile, vinylidene chloride and fluoride, vinyl fluoride and chlorotrifluoroethylene. The resin may contain 0-100% by weight of pigment, 0-40% plasticizer and 0-5% stabilizer.  The solvent may be a mixture of polar solvent, e.g. ketones, ethers, nitroparaffins and chlorinated solvents, and diluent solvents, e.g. aromatic and aliphatic hydrocarbons.  The amino-organo-silicon compounds may have the formula R1-NH-R-Si-X3 where R is a C3+ divalent hydrocarbon group; R1 is H or a monovalent organic group, e.g. cyanoalkyl, aminoalkyl or R-Si-X3; and X is a hydrocarbon, halogenated hydrocarbon, alkoxy, hydroxy, -NHR-, or -O-Sigroup or system.  Various mono-and poly-epoxides may be used, an extensive list of examples including hydrocarbon epoxides, glycidyl ethers, epoxy carboxylates, esters and ethers and reaction products of halohydrins and polyhydric phenols. Specific materials used in the various specific examples include:- Resins: polyvinyl chloride; and vinyl chloride-vinyl acetate copolymer and terpolymer with maleic anhydride or vinyl alcohol.  Amino-organosilicon-epoxy mixtures: gamma - aminopropyltriethoxysilane / phenyl-, vinyl-, or amyl-triethoxysilane/diglycidyl ether of 4,41-dihydroxydiphenyl-2,2-propane; and a similar mixture having part of the phenyltriethoxysilane replaced by dimethyldiethoxysilane; Solvents: MiK and toluene; ethylene glycol methyl ether and toluene with or without diisobutyl ketone and/or a commercial aromatic hydrocarbon mixture; Optionals: aluminium powder, dioctylphthalate, titanium dioxide, antimony oxide, tritolylphosphate and an organo-tin stabilizer.  Coating metals The composition is applied, by spraying or dipping, to a metal surface which need not be clean but may be dirty, oily, rusted, oxidized, tarnished or corroded, and cured thereon.  The metal may be Sn, Al, Cu, Zn, Fe, Mg, Ni, Pb or Ag or a plating, e.g. copper, tin, silver or chromium plate, or an alloy or mixture, e.g. steel, brass or bronze.  The composition may be used as a primer coat.  Specifications 952,992, 952,993, 952,994 and 952,995 are referred to.