Manufacture of paper having a high dry strength and a low...

Details Manufacture of paper having a high dry strength and a low... Manufacture of paper having a high dry strength and a low...

B - Operations, Transporting

32

B

117/199

B32B 27/10 (2006.01) D21H 17/43 (2006.01)

Patent

CA 1140819

ABSTRACT OF THE DISCLOSURE A process for the manufacture of paper having a high dry strength and a low wet strength, by treating the surface of the paper with an aqueous solution of an alkaline earth metal salt of, or a mixture of an alkaline earth metal salt and an alkali metal salt of a polymer of (a) from 91 to 100% by weight of acrylic acid and/or methacrylic acid and (b) from 0 to 9% by weight of acrylonitrile, methacrylonitrile, acrylamide, methacrylamide, vinyl acetate, maleic anhydride, diisobutylene, an ester of acrylic acid and/or an ester of methacrylic acid, which has a viscosity of from 5 to 100 mPas in 2% strength aqueous solution at 20°C, and drying the impregnated paper. The polymer is generally employed in an amount of from 1 to 4% by weight, based on dry paper, and increases the dry strength of the paper without substantially increasing the wet strength.

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