Paper with synergistic dry strength additives and process therefor
US4036682A · kind A · utility
5Cited by
1References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1975 |
| Grant date | Jul 19, 1977 |
| Priority date | — |
| Expiry date | Jun 25, 1995 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/50
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Paper of high dry strength is produced by adding to a solution of fibers from 0.1 to 2% of a cationic resin and from 0.1 to 2% of an anionic resin. Proportion of cationic to anionic resin is in the range of 99:1 to 50:50. The preferred cationic resin is a condensation product of acetone, formaldehyde and polyalkylene polyamine which is prepared in presence of a catalytic amount of a strong inorganic acid and has a mol ratio of 1:3:0.5, respectively. The anionic resin is a copolymer of acrylamide and maleic acid or its anhydride having a mol ratio of from 90:10 to 98:2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.