Composition and process for increasing the dry strength of a paper product
US8980056B2 · kind B2 · utility
1Cited by
7References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 15, 2010 |
| Grant date | Mar 17, 2015 |
| Priority date | — |
| Expiry date | Nov 15, 2030 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/375
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A dry strength additive composition generally includes an anionic and/or amphoteric polyacrylamide having a molecular weight of less than 1,000,000 Daltons, wherein the amphoteric polyacrylamide has a net negative charge; a cationic and/or amphoteric starch; and a cationic non-starch polymer having a charge density greater than 1 milliequivalent per gram (meq/g) at a pH of 3. The components defining the composition can be added to a pulp suspension sequentially or as a pre-blended mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.