| 摘要 |
PROBLEM TO BE SOLVED: To provide a filler for papermaking which is subjected to treatment for reducing the decrease in especially inside strength among paper strengths even on making the paper have a light weight and without reducing whiteness, when on making the paper thin, not only non-transparency is decreased, but also the yield rate of the filler in a papermaking raw material is decreased, and also the whiteness is tend to be reduced and the inside strength among the paper strengths is tend to be reduced. SOLUTION: An additive for the paper, which is produced by adding a synthetic water soluble anionic polymer and synthetic water soluble cationic polymer in an aqueous inorganic fine particle dispersion to form fine coagulated particles, is added to the papermaking raw material. The weight average molecular weights of these water soluble polymers are preferably 5,000-500,000. COPYRIGHT: (C)2010,JPO&INPIT |
