D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/39
D21C 9/00 (2006.01) D21C 9/10 (2006.01) D21H 21/30 (2006.01) D21H 11/20 (2006.01)
Patent
CA 1289306
A method for stabilizing the brightness of bleached lignin containing cellulose pulp A B S T R A C T The present invention solves the problem of the yellow- ing, often pronounced yellowing, of lignin containing cellu- lose pulps, e.g. high yield pulp. In accordance with the invention the pulp, subsequent to being bleached is: a) always treated with at least one chemical, which chemi- cally reduces .alpha. -carbonyl and .gamma. -carbonyl groups in the lignin; and in at least one further step is b) treated with at least one chemical, which will block the phenolic hydroxyl groups of the lignin and/or c) supplied with at least one chemical, which will convert short-wave light quanta to long-wave light quanta. According to a preferred embodiment of the invention cellulose pulp is subjected to all of the above treatment processes, i.e. a) + b) + c) and is washed after the two initial treatment stages.
560133
Agnemo Arne Roland
Lunden-Lundgren Eva Birgitta
Macrae & Co.
Mo Och Domsjo Ab
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