Process for manufacturing paper using a base copolymer that has reacted with an aldehyde as a dry strength, retention, drainage and runnability aid
US9506200B2 · kind B2 · utility
1Cited by
2References
20Claims
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Key dates
| Filing date | Feb 26, 2013 |
| Grant date | Nov 29, 2016 |
| Priority date | — |
| Expiry date | Jul 9, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2800/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Process for manufacturing a sheet of paper and/or of paperboard and the like, according to which, the cellulosic material is brought into contact with at least one dry strength aid, characterized in that said dry strength aid is a cationic or amphoteric (co)polymer derived from the reaction between at least one aldehyde and at least one base (co)polymer comprising at least one nonionic monomer, said base copolymer being modified with at least one polyfunctional compound comprising at least three heteroatoms chosen from N, S, O and P, in which at least three of these heteroatoms each have at least one mobile hydrogen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.