Method for producing pulp and paper with calcium carbonate filler
US6235150A · kind A · utility
47Cited by
4References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1999 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Mar 18, 2019 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/675
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method is described for attaining high levels of loading of calcium carbonate fillers in the lumens of wood pulp fibers. The pulp is pretreated with a cationic polymer prior to being impregnated with the filler. Different conditions of pH and temperature are specified depending on whether the filler is a precipitated calcium carbonate or a ground calcium carbonate. The lumen-loaded pulps are used to make novel products with advantages in higher filler retention and sheet strength over conventionally made papers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.