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US 6,365,002 B1Granted
Amphoteric starches used in papermaking
AssigneeNational Starch and Chemical Investment Holding Corporation
InventorsWolfgang Bindzus, Paul A. Altieri
Life of this patent
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Abstract
The use in papermaking of an amphoteric starch additive which contains a phosphate functional group and is made under anhydrous conditions while in a fluidized state, provides advantageous paper properties and improved wet end performance.
Claims21
A method of making paper comprising adding to the paper stock prior to or during formation of the sheet, an effective amount of an amphoteric starch which contains a cationic component and an anionic phosphate component and is made by:
- a) impregnating a cationic starch with a phosphate reagent to form an impregnated starch;
- b) drying the impregnated starch to a moisture content of less than 1% by weight of starch;
- and
- c) heating to phosphorylate the starch.
1 more element
Dependencies are inferred from the claim text.