Process for non-chlorine oxidative bleaching of mechanical...

Details Process for non-chlorine oxidative bleaching of mechanical... Process for non-chlorine oxidative bleaching of mechanical...

2011-06-28

2011-06-28

Daniels, Matthew J (Department: 1741)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

C162S021000, C162S072000, C008S156000

Reexamination Certificate

active

07967948

ABSTRACT:
A process for bleaching mechanical wood pulp is provided comprising subjecting the wood pulp to at least one bleaching stage with one or more bleaching agents in the presence of one or more optical brightening agent, wherein the bleaching agents are selected from the group consisting of oxidative bleaching agents other than chlorine based bleaching agents such as chlorine dioxide, elemental chlorine or a combination thereof, reductive bleaching agents or any combination of two or more thereof.

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