Method for improving brightness in bleached pulp
US9068293B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2013 |
| Grant date | Jun 30, 2015 |
| Priority date | — |
| Expiry date | Mar 31, 2033 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/1042
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The invention is directed towards methods and compositions for processes based on the combination of organic peroxyacids and ammonium salts that preserve and enhance the response to optical brighteners (fluorescent whitening dyes), brightness and improve color of pulp or paper when applied during different stages of the papermaking process are identified. The composition and method improve response to optical brighteners (fluorescent whitening dyes), maintain and/or enhance brightness and enhance the performance of paper products. Used in combination with optical brighteners the described agents produce a synergistic effect not previously identified in the paper process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.