| 摘要 |
PURPOSE:To enhance transparency, oil resistance and water resistance, by adding a polyvalent-metal compound and a volatile complexing agent to an aqueous solution of a copolymer consisting of a specified amount of an ethylenically unsaturated carboxylic acid and a specified amount of a copolymerizable vinyl monomer. CONSTITUTION:A polyvalent-metal compound and a volatile complexing agent are added to an aqueous solution or dispersion of a copolymer consisting of 5-80wt% of an ethylenically unsaturated carboxylic acid and 20-95wt% of a copolymerizable vinyl monomer to form a soluble complex salt. Then, the complexing agent is evaporated off to produce a water-insoluble surface protective agent for a thermal recording paper. The carboxylic acid may be acrylic acid, methacrylic acid or the like, while the vinyl monomer may be methyl acrylate, methyl methacrylate or the like. The polyvalent-metal compound may be an inorganic acid salt, oxide or the like of zinc, cadmium, cobalt, nickel, copper or the like. |
