| 摘要 |
PURPOSE:To prevent generation of a coagulated product in a coating soln., and to prevent occurrence of tailing in the stage of coating multiple layers at the same time by a slide-hopper process by using a coating soln. contg. both gelatin having <=about 1,000ppm Ca concn. and at least one specified amphoteric compd. CONSTITUTION:Suitable gelatin to be used is one having <=about 1,000ppm Ca concn. and suitable amphoteric compd. to be used is one having an oleophilic atomic group comprising a >=5C alkyl group, aryl group, or aralkyl group in a moiety and a hydrophilic atomic group in another moiety of the molecule. Better result is obtained when the Ca concn. of the gelatin is low, and such gelatin having <=about 500ppm Ca concn. is preferred. By this constitution, generation of coagulated product is prevented, and occurrence of tailing in the stage of coating multiple layers at a same time by the slide-hopper process is prevented. |
