| 摘要 |
PROBLEM TO BE SOLVED: To provide a newsprint paper, having bulkiness, hardly causing reduction of rigidity, and having high opacity, high friction coefficient and excellent printing processability. SOLUTION: The newsprint paper having 0.20-0.60 dynamic friction coefficient and≥90% opacity is obtained by making a paper containing 0.1-10 wt.% as a solid of a paper quality-improving agent for internal filling, comprising a polymer emulsion containing a synthetic cationic polymer providing 7 wt.% aqueous solution having≥20 mPas viscosity at 50°C, and having≤1.0 wt.% nitrogen content, and polymer particles containing a constituent unit derived from a vinyl monomer and having≤90°C glass transition temperature, based on the amount of the raw material pulp. COPYRIGHT: (C)2005,JPO&NCIPI
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