Absorbent paper comprising polymer-modified fibrous pulps and wet-laying process for the production thereof
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United States of America Patent
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Jan 22, 1991
Grant Date -
N/A
app pub date -
Jul 11, 1989
filing date -
Jul 11, 1989
priority date (Note) -
Expired
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Abstract
Processes are described for making highly absorbent tissues and towels by wet-laying pulps comprising particular polycarboxylate polymer-modified fibrous pulps such as mildly hydrolyzed methyl acrylate-grafted softwood kraft pulps; these pulps have distinct protonated and alkali-metal-cation-exchanged states. The wet-laying processes are adapted to exploit the very different behavior of the polymer-modified fibrous pulps in function of the two states. The preferred wet-laying processes described herein are continuous processes embodying one or more on-line chemical treatment steps which chemically switch state of the polymer-modified fibrous pulp component in a wet web on the papermaking machine to improve the processing thereof by averting or minimizing tendencies to mechanically or thermally degrade.
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