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AssigneeTeijin Limited
InventorsYorikazu Tamura, Yasuhisa Shishido
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A method for preparing a vinyl fluoride-hexafluoropropylene copolymer resin having an inherent viscosity of 0.2 to 2 suitable for use in liquid coating compositions in the presence of an organic peroxide initiator, a fluorine-containing surface active agent, a dispersing agent and/or a molecular-weight regulating agent. Liquid coating compositions containing the vinyl fluoride-hexafluoropropylene resin having superior storage stability even in high concentrations and can form a coating layer having outstandingly superior mechanical strength properties such as tensile strength, initial Young's modulus or hardness and superior transparency and gloss. The liquid coating composition comprises the vinyl fluoride-hexafluoropropylene copolymer composed of 5 to 50 mol % of units derived from hexafluoropropylene, 0 to 10 mol % of units derived from a third component and the remainder being units derived from vinyl fluoride, and specified solvent, the amount of the copolymer being 1 to 50% by weight, as solids content, based on the weight of the composition.
A method for preparing a vinyl fluoride-hexafluoropropylene copolymer comprising polymerizing 5 to 50 mol % of hexafluoropropylene, 0 to 10 mol % of a monomer selected from the group consisting of vinyl esters of aliphatic carboxylic acids having 1 to 6 carbon atoms or 0 to 1 mol % of a monomer selected from the group consisting of unsaturated aliphatic carboxylic acids having 3 to 6 carbon atoms, lower alkyl esters of acrylic acid having an epoxy group and lower alkyl esters of methacrylic acid containing an epoxy group, and vinyl fluoride in an aqueous suspension in the presence of an organic peroxide initiator, a fluorine-containing surface active agent and a dispersing agent selected from the group consisting of methyl cellulose, gelatine, tragacanth, starch, carboxymethyl cellulose, polyvinyl alcohol, partially saponified polyvinyl alcohol and polyacrylic acid.
Dependencies are inferred from the claim text.