Paper wet-strength improvement with cellulose reactive size and

Details Paper wet-strength improvement with cellulose reactive size and Paper wet-strength improvement with cellulose reactive size and

1994-03-07

1995-03-14

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

1621682, 162179, D21H 2120

Patent

active

053974360

ABSTRACT:
The wet strength of cellulosic paper is improved by adding the combination of an amine-functional poly(vinyl alcohol) and a cellulose reactive size which is a 4 or 5 membered cyclic ester or anhydride having alkyl or alkenyl substituents of 4 or more carbon atoms. The amine-functional polymer is preferably a hydrolyzed copolymer of vinyl acetate and N-vinylformamide in which about 1-25 mole % of the monomer units are incorporated N-vinylformamide, and the cellulose reactive size is preferably an alkyl ketene dimer or an alkenyl succinic anhydride. A paper product is provided having improved wet-strength and containing normally 0.05 to 4.0 wt % based on the dry pulp of the additive amine-functional polymer and cellulose reactive size. The particular compounds which represent the polymer and the size cooperate to provide improvements in wet-tensile strength for paper which could not have been foreseen from the effects of either material acting alone.

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Encyclopedia of Polymer Science and Engineering; vol. 10; pp. 761-786.
Zhou; Paper Technology; pp. 19-22; Jul. 1991.
Marton; Tappi J.; pp. 139-143; Nov. 1990.

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