| 摘要 |
PROBLEM TO BE SOLVED: To provide a high quality paper for books, having a high bulkiness, a small reduction in paper strength, further a good sizing degree development and a high sizing degree, and a method for producing the same. SOLUTION: This middle quality paper for the books 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 sizing agent added in the paper and 5-40 wt. % filler. (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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