초록

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.

대표청구항 ▼

1. 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

1. 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.