Weyerhaeuser Company Limited

Weyerhaeuser Nr Company

Bing Su

S Ananda Weerawarna

Richard A Jewell

Joseph Lincoln Komen

John A Westland

David J O'Callaghan

Yong Li

Sherry L Thomson

Mengkui Luo

Alena Michalek

David E Severeid

A cement product incorporating nanocrystalline cellulose and cellulose fiber throughout the product and a method of making the product.

Method of making a fiber cement board with improved properties and the product

A method for making mixed polymer composite fibers containing cellulose fibers in which cellulose fibers are dispersed in an aqueous solution comprising a carboxyalkyl cellulose and a galactomannan polymer or a glucomannan polymer in water to provide an aqueous fiber dispersion; the aqueous dispersion treated with a first crosslinking agent to provide a gel; the gel mixed with a water-miscible solvent to provide composite fibers; and the composite fibers treated with a second crosslinking agent to provide crosslinked fibers.

Methods for the preparation of mixed polymer superabsorbent fibers containing cellulose

A mixed polymer composite fiber including a carboxyalkyl cellulose and a galactomannan polymer or glucomannan polymer.

Mixed polymer superabsorbent fibers

An apparatus for carboxylating wood pulp which utilizes the wood pulp bleach plant and the method of carboxylating the pulp which takes place in the bleach plant.

Apparatus for making carboxylated pulp fibers

The invention is directed to a method of making carboxylated cellulose fibers whose fiber strength and degree of polymerization is not significantly sacrificed. The method involves the use of cyclic nitroxide free radical compounds as a primary oxidant and a hypohalite salt as a secondary oxidant in an aqueous environment. Preferably the oxidized cellulose is then stabilized against D.P. loss in alkaline environments and color reversion with a reducing agent such as sodium borohydride. Alternatively it may be treated with an oxidant such as sodium chlorite. The method results in a high percentage of carboxyl groups located at the fiber surface. The product is especially useful as a papermaking fiber where it contributes strength and has a higher attraction for cationic additives. The product is also useful as an additive to recycled fiber to increase strength. The method can be used to improve properties of either virgin or recycled fiber. It does not require high &agr;-cellulose fiber but is suitable for regular market pulps.

Method of making carboxylated cellulose fibers and products of the method

The invention is directed to a method of making carboxylated cellulose fibers whose fiber strength and degree of polymerization is not significantly sacrificed. The method involves the use of TEMPO (2,2,6,6-tetramethylpiperidinyloxy free radical) as a primary oxidant and a hypohalite salt as a secondary oxidant in an aqueous environment. Preferably the oxidized cellulose is then stabilized against D.P. loss in alkaline environments and color reversion with a reducing agent such as sodium borohydride. Alternatively it may be treated with an oxidant such as sodium chlorite. The method results in a high percentage of carboxyl groups located at the fiber surface. The product is especially useful as a papermaking fiber where it contributes strength and has a higher attraction for cationic additives. The product is also useful as an additive to recycled fiber to increase strength. The method can be used to improve properties of either virgin or recycled fiber. It does not require high &agr;-cellulose fiber but is suitable for regular market pulps.

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Federal Way, WA, United States of America

Bing Su