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US 2006/0185806 A1Published application
Retention and drainage aids
AssigneeHercules Incorporated
InventorsJohn Harrington, Martha Hollomon
Life of this patent
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Abstract
The present invention describes polymeric retention and drainage aids for cellulosic fiber compositions and methods of use of the same.
Claims20
A cellulosic fiber composition comprising:
- cellulose fiber and a water-compatible polymer comprising a polymer segment formed from at least one ethylenically unsaturated monomer (A) substituted with at least one aryl group and at least one —S(═O)2OR1 or —OS(═O)2(O)pR1 moiety, wherein p is 0 or 1, R1 is, independently at each occurrence, H, alkyl, aryl, or a cation, and the polymer has a weight average molecular weight of about 5 million or greater.
A method for preparing a cellulosic fiber composition, comprising:
- adding to an aqueous cellulosic fiber slurry an anionic water-compatible polymer comprising a polymer segment formed from at least one ethylenically unsaturated monomer (A) substituted with at least one aryl group and at least one —S(═O)2OR1 or —OS(═O)2(O)pR, moiety, wherein p is 0 or 1, R1 is, independently at each occurrence, H, alkyl, aryl, or a cation, and the polymer has a weight average molecular weight of about 5 million or greater.
A method for improving drainage and retention of solids in a cellulosic fiber composition, comprising:
- adding to the cellulosic fiber composition an anionic water-compatible polymer comprising a polymer segment formed from at least one ethylenically unsaturated monomer (A) substituted with at least one aryl group and at least one —S(═O)2OR1 or —OS(═O)2(O)pR1 moiety, wherein p is 0 or 1, R1 is, independently at each occurrence, H, alkyl, aryl, or a cation, and the polymer has a weight average molecular weight of about 5 million or greater.
Dependencies are inferred from the claim text.