Production of paper and paperboard of high dry strength

Details Production of paper and paperboard of high dry strength Production of paper and paperboard of high dry strength

D - Textiles, Paper

21

H

9/43

D21H 17/44 (2006.01) D21H 17/28 (2006.01) D21H 17/45 (2006.01) D21H 21/18 (2006.01)

Patent

CA 1290508

Abstract of the Disclosure: Paper and paperboard of high dry strength are produced by adding a dry strength en- hancer to the paper stock and dewatering the paper stock with sheet formation by using as the dry strength enhan- cer a mixture of a cationic polymer which contains as characteristic monomers copolymerized units of a) diallyldimethylammonium chloride, b) N-vinylamine or c) a substituted or unsubstituted N-vinylimidazoline and has a K value of not less than 30, and natural potato starch which is converted into a water-soluble form by heating in an aqueous medium at above the gelatinization temperature of natural potato starch in the absence of any oxidizing agents or alkali.

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