| 摘要 |
PURPOSE:To improve the light resistance of micro-capsule layers by using a layer containing two or more kinds of water-soluble polymers and micro capsules with a color-forming agent. CONSTITUTION:By using two or more kinds of water-soluble polymers mixed and also by regulating the light transmissivity of a micro capsule film to 70% or less at a thickness of 5mum, the light resistance of the layer is greatly improved. As the water-soluble polymer used, a mixture of at least one of polyethylene glycol and polyacrylic acid and at least one of polyvinyl alcohol, polyvinyl pyrolidone, and acrylamide-modified polyvinyl alcohol is used. A color-forming agent is dissolved in a solvent and capsulated, and the capsules are coated on a supporter. As the solvent, one or a mixture of natural or synthetic oils is used. In preparing the coating liquid containing the micro capsules with the color-forming agent, a capsule protector, besides the micro capsules with color-forming agent and a binder, is added to the coating liquid. |
