Manufacture of paper having a high dry strength and a low wet st

Details Manufacture of paper having a high dry strength and a low wet st Manufacture of paper having a high dry strength and a low wet st

1980-01-03

1981-10-13

Lusignan, Michael R.

Coating processes

With post-treatment of coating or coating material

Heating or drying

428514, 428511, 260 296H, B05D 302, B32B 2308, B32B 2710

Patent

active

042948738

ABSTRACT:
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 alkali metal and/or alkaline earth 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.degree. 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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