Enzymes in combination with polyelectrolytes for enhancing the freeness of clarified sludge in papermaking
US5501770A · kind A · utility
11Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1994 |
| Grant date | Mar 26, 1996 |
| Priority date | — |
| Expiry date | Aug 12, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/928
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for improving the freeness of paper pulp, which comprises the steps of adding to the pulp at least 0.05%, based on the dry weight of the pulp, of a cellulolytic enzyme, allowing the pulp to contact the cellulolytic enzyme for from about 40 minutes to about 60 minutes at a temperature of at least 40.degree. C., adding at least 0.011%, based on the dry weight of the pulp, of a water soluble cationic polymer, adding at least 0.007%, based on the dry weight of the pulp, of a water soluble anionic or nonionic polymer and forming the thus treated pulp into paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.