Method of using aldehyde-functionalized polymers to enhance paper machine dewatering
USRE45383E1 · kind E1 · reissue
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29References
22Claims
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Key dates
| Filing date | Jul 31, 2012 |
| Grant date | Feb 24, 2015 |
| Priority date | — |
| Expiry date | Jul 31, 2032 |
Classification
- Technology area (CPC —)General
Abstract
A method of enhancing the dewatering of a paper sheet on a paper machine comprising adding to the paper sheet about 0.05 lb/ton to about 15 lb/ton, based on dry fiber, of one or more aldehyde functionalized polymers comprising amino or amido groups wherein at least about 15 mole percent of the amino or amido groups are functionalized by reacting with one or more aldehydes and wherein the aldehyde functionalized polymers have a molecular weight of at least about 100,000.
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