Retention improving composition
US7776181B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2005 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | Sep 18, 2026 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/44
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A novel retention aid is provided, which can realizes not only high retention but also excellent paper formation and is easy to use, in various papermaking processes. A composition for improving retention is provided, which comprises (A) a cationic water-soluble polymer and (B) an amphoteric water-soluble polymer. The component (A) preferably is a copolymer having a cation equivalent of 0.05 to 4.00 meq/g or one having a 0.5% salted viscosity of 30 to 200 mPa·s. The component (B) preferably is either a copolymer comprising a cationic radical-polymerizable monomer unit, an anionic radical-polymerizable monomer unit, and a nonionic radical-polymerizable monomer unit, or an amphoteric water-soluble polymer obtained by polymerizing a cationic radical-polymerizable monomer with an anionic radical-polymerizable monomer in the presence of a polysaccharide. From the standpoint of attaining excellent formation, the component (B) preferably has a molar proportion of the cationic radical-polymerizable monomer unit to the anionic radical-polymerizable monomer unit (hereinafter referred to as Ca/An) satisfying Ca/An<1.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.