Method for effectively breaking up latex-coated paper during pulping to decrease the potential for white pitch deposition
US4997523A · kind A · utility
12Cited by
6References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1990 |
| Grant date | Mar 5, 1991 |
| Priority date | — |
| Expiry date | Jun 20, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S162/04
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A composition and method for inhibiting the deposition of white pitch on the surfaces of papermaking equipment during the processing of recycled coated broke. The process involves adding to the coated broke during repulping a composition having a first compound of a tetrafunctional alkoxylated diamine having the structure: ##STR1## wherein R.sub.1 and R.sub.2 are ethylene oxide or propylene oxide and R.sub.1 and R.sub.2 are not the same, and a second compound selected from the group consisting of a phosphate, phosphonate and phosphonic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.