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US 6,211,357 B1Granted
Strengthening compositions and treatments for lignocellulosic materials
AssigneePaper Technology Foundation Inc.
InventorsBlair Alex Owens, Dimitris Ioannis Collias, Andrew Julian Wnuk
Life of this patent
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Abstract
The strength of lignocellulosic materials is improved by treating them with water-soluble strengthening agents containing sulfonic units, and rendering these agents water-insoluble by reacting them with compounds containing epoxide rings and quaternary ammonium groups. Thus, a substantial reduction or elimination of the bleeding of said strengthening agents from the lignocellulosic materials when touched with wet hands or contacted under humid conditions is achieved.
Claims4
A product in lignocellulosic material, said product comprising a precipitate of:
- a) a water-soluble strengthening agent having at least one nucleophilic sulfonic unit;
- and
- b) a compound having at least one epoxide ring and at least one quaternary ammonium group,
- said precipitate reducing bleeding of said strengthening agent from said lignocellulosic material.
1 more element
Dependencies are inferred from the claim text.