US 2006/0207732 A1 · Methods for improving discoloration resistance of pulp and pulp improved in discoloration resistance

Abstract

The present invention aims to provide a method for improving discoloration in pulp, characterized by a versatile technique adaptable to any type of pulp, a time-saving process, a great and permanent anti-fading effect, environmental friendliness and other properties, as well as a pulp with greatly improved discoloration obtained by said method for improving discoloration. Discoloration in pulp can be greatly improved by adding one or more additives selected from the group consisting of reducing agents, peroxides and hydrogen-donating organic compounds to one of bleached mechanical pulp, semi-chemical pulps, chemical pulp and deinked pulps or a mixture of two or more of them, and irradiating it with UV and/or visible light.

Claims11

Dependent claims

1-4. (canceled)

Dependencies are inferred from the claim text.

Facts

Application

10/533,657Filed 7 Nov 2003

Priority

JP 2002-3237187 Nov 2002

Published

21 Sep 2006

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

D21C 9/001
After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking…:…
D21H 11/20
Modified by a particular after-treatment: chemically or biochemically modified fibres
D21C 9/1047
Other features in bleaching processes: conserving the bleached pulp
D21C
Production of cellulose by removing non-cellulose substances from cellulose-containing materials

Methods for improving discoloration resistance of pulp and pulp improved in discoloration resistance

Life of this patent

Methods for improving discoloration resistance of pulp and pulp improved in discoloration resistance

Life of this patent

Abstract

Claims11