| 摘要 |
PURPOSE:To obtain paper or paperboard enhanced in chemical settability and paper, strength, by incorporating a paper stock slurry with e.g. a water-soluble cationic polymer followed by aluminum sulfate and then a specific water-soluble anionic polymer, and by putting the resultant system to papermaking process. CONSTITUTION:A paper stock slurry is incorporated with a water-soluble cationic polymer or water-soluble amphoteric polymer followed by aluminum sulfate and then a water-soluble anionic polymer which has been prepared by polymerization between 55-97wt.% of a 2-acrylamide-2-propanesulfonate and 3-45wt.% of vinyl monomer A. The resultant system is then subjected to papermaking process, thus obtaining the objective paper or paperboard. Said vinyl monomer A to be used consists of at least one kind of compound selected from (meth)acrylamide, acrylonitrile, unsaturated carboxylic acid (ester) of formula I (R1 is H or CH3; R2 is H or 1-8C alkyl), unsaturated carboxylate of formula II (M is alkali metal, ammonium etc.) and unsaturated dibasic acid (salt). |
