| 摘要 |
PROBLEM TO BE SOLVED: To provide a middle quality paper for books, having a high bulkiness, a small reduction in paper strength and further a high frictional coefficient, and excellent in working property for printing. SOLUTION: This middle quality paper for the books having 0.20-0.60 dynamic frictional coefficient contains (A) a copolymer having a structural unit derived from≥1 kind of a nonionic monomer having≤20.5 (MPa)<SP>1/2</SP>solubility parameter and a structural unit derived from≥1 kind of an anionic or a cationic monomer, and (B) a surfactant by (A)/(B)=(99/1)-(1/99) (weight ratio) range, and also contains a paper quality-improving agent for papermaking, bringing≥1 paper quality-improving effect of any of the following (a), (b) and (c). (a)≥0.02 g/cm<SP>3</SP>standard bulkiness-improving degree. (b)≥1.0 point standard opacity-improving degree. (c)≥0.5 point standard whiteness. COPYRIGHT: (C)2005,JPO&NCIPI
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