| 摘要 |
PURPOSE:To form a high density image even in high temperatures and high humidities, by providing a mixture of water-soluble acrylic ester resins differring in Tg from each other in a specified weight ratio and a specified attachment ratio on a paper base. CONSTITUTION:At least one side of a paper base is coated or impregnated with a mixture of water-soluble acrylic ester resins having <=-20 deg.C and >=60 deg.C glass transition points, and (80-40):(20-60) weight ratio. An amount of the mixture added must be in 2-8g/m<2> range. As the resin having <=-20 deg.C Tg, ethyl acrylate-ammonium acrylate copolymer in 1:9 weight ratio, ethyl acrylate polymer, etc., and as the resin having >=60 deg.C Tg, methyl methacrylate-ethyl acrylate-unsaturated carboxylic acid copolymer in 7:2:1 weight ratio, methyl methacrylate-butyl acrylate in 6:4 weight ratio, etc. are preferred. |
