| abstract |
The present invention provides a drug that improves yield and dewaterability in a paper machine, and provides a high-concentration salt, a new drug that is not easily disturbed by polyanions or anion colloids, and a papermaking method using the same. To do. One or more nonionic monomers and various specific zwitterionic monomers are copolymerized to produce high molecular weight zwitterionic internal salt copolymers, yield improvers, Used as a dehydration improver. [Selection figure] None |