Hydrophilic cationic copolymers of acrylamide or methacrylamide
US4696962A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1984 |
| Grant date | Sep 29, 1987 |
| Priority date | — |
| Expiry date | Jul 24, 2004 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/455
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A cationic polymer composition suitable for use as a flocculating agent and as a retention aid and dewatering agent in paper making consists of a mixture of PA0 (a) a hydrophilic cationic polymer of PA1 (a.sub.1) acrylamide and/or methacrylamide and PA1 (a.sub.2) dialkylamino-C.sub.2-3 alkylene-(meth)acrylamide PA0 the molar quantity of cationic monomer units (a.sub.2) being from 0.2 to 9 mol % of the total PA0 (b) an anionic surfactant PA0 (c) a water-immiscible oil in which the polymer (a) is insoluble, and PA0 optionally (d) a lipophilic non-ionic surfactant, PA0 optionally (e) water PA0 and optionally (f) an oil-miscible polar solvent. The compositions may be prepared by water-in-oil emulsion copolymerization and are readily diluted with water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.