C - Chemistry – Metallurgy – 08 – B
Patent
C - Chemistry, Metallurgy
08
B
C08B 15/04 (2006.01) D21C 9/00 (2006.01) D21H 11/20 (2006.01)
Patent
CA 2383803
The invention is directed to a method of making a heat and light stable carboxylated cellulose fiber whose fiber strength and degree of polymerization is not significantly sacrificed. The method involves the use of a catalytic amount of a hin- dered cyclic oxammonium salt as a primary oxidant and a peracid and halide salt as a secondary oxidant in an aqueous environment. The oxammonium compounds may be formed in situ from their corresponding amine, hydroxylamine, and nitroxyl com- pounds. The oxidized cellulose is then stabilized against D.P. loss and color reversion by further treatment with an oxidant such as sodium chlorite, a chlorine diox- ide/hydrogen peroxide mixture, or a peracid under acidic conditions. Alternatively it may be treated with a reducing agent such as sodium borohydride. The method results in a high percentage of carboxyl groups located at the fiber surface. The product is es- pecially 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 vir- gin or recycled fiber. It does not require high .alpha.-cellulose fiber but is suitable for regu- lar market pulps.
Jewell Richard A.
Komen Joseph Lincoln
Weerawarna S. Ananda
Smart & Biggar
Weyerhaeuser Company
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