Glyoxylated polyacrylamide polymer composition, its use and method for increasing the strength properties of paper, board or the like
US11066546B2 · kind B2 · utility
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17Claims
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Key dates
| Filing date | Jul 5, 2017 |
| Grant date | Jul 20, 2021 |
| Priority date | — |
| Expiry date | Sep 27, 2037 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H23/04
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A cationic glyoxylated polyacrylamide polymer composition having improved storage stability for use in manufacture of paper, board or the like, which aqueous composition includes a glyoxylated polyacrylamide polymer having a cationic charge density in a range of 0.8-1.8 meq/g of dry polymer in dry content of 5-15% and a buffering acid. The aqueous composition has pH in a range of 2.2-4.0 and a viscosity of less than 80 mPas measured at 25° C. by using a Brookfield viscometer after 30 days storage at 35° C. or after 60 days storage at 23° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.