Polysaccharide aldehydes prepared by oxidation method and used as strength additives in papermaking
US6872821B2 · kind B2 · utility
41Cited by
16References
20Claims
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Key dates
| Filing date | Apr 23, 2003 |
| Grant date | Mar 29, 2005 |
| Priority date | — |
| Expiry date | Apr 23, 2023 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polysaccharide aldehydes are prepared using selective oxidation involving the use of nitroxyl radical mediated aqueous oxidation with a limited amount of oxidant and defined reaction conditions. These polysaccharide aldehyde derivatives having maximum effective aldehyde and minimal carboxylic acid levels making them especially useful as wet, temporary wet and dry strength additives for paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.