| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for reducing pitch in a paper-making process of paper and paperboard, wherein pitch causes troubles such as paper making defect and blot generation. SOLUTION: The problem is settled by applying in paper-making material before paper-making, a vinyl polymerization-based crosslinking water-soluble cationic or amphoteric polymer of ≥35% but ≤90% charge inclusion ratio, provided by polymerization of vinyl monomer or a vinyl monomer mixture. COPYRIGHT: (C)2011,JPO&INPIT |
