C - Chemistry – Metallurgy – 12 – S
Patent
C - Chemistry, Metallurgy
12
S
C12S 3/08 (2006.01) D21C 5/00 (2006.01) D21C 9/10 (2006.01)
Patent
CA 2130906
ABSTRACT Provided is a method for enlarging the degree of delignification in chemical pulping without lowering the viscosity of the resulting pulp. According to the method, an unbleached pulp or an oxygen-delignified pulp is held in an acidic condition before bleaching and treated with a xylanase exhibiting the activity at pH 4.5 or less. The bleached pulp has a level of whiteness applicable to commercial use. The amount of chlorine-containing compounds to be used for bleaching may be reduced, and the generation of organic chlorine compounds harmful to environment may be reduced. - 60 -
Kawabata Haruhiko
Matsuhashi Mitsuhiro
Matsuura Akira
Ohmori Shunji
Sakai Toshihide
Amano Pharmaceutical Co. Ltd.
Borden Ladner Gervais Llp
Mitsubishi Paper Mills Limited
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