Dry strength paper and process therefor
US4007084A · kind A · utility
4Cited by
0References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1975 |
| Grant date | Feb 8, 1977 |
| Priority date | — |
| Expiry date | Jun 25, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G12/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Paper of high dry strength is produced by forming an aqueous solution of cellulose fibers and adding thereto a polymeric product of acetone, formaldehyde and polyethylene polyamine, which product is prepared at reflux temperature in presence of a catalytic amount of a strong inorganic acid and has a mol ratio of 1:3:0.5, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.