Patent ID: 8784607
Filing Date: 2014-07-22
Classification: D21B,D21C,D21J,Y10T

Abstract:
1. A process for the production of a bleached wood particle comprising a) milling an optionally pretreated, comminuted, cellulose-containing raw material in a refiner to obtain a wood particle and b) removing the wood particle from the refiner, wherein said wood particle is bleached in a) or in b) by the addition of a bleach composition consisting of i) from 60 to 95% by weight of one or more hydrosulfite salts, ii) from 1 to 25% by weight of one or more sulfite salts, iii) from 1 to 10% by weight of one or more basic salts selected from the group consisting of carbonates and bicarbonates, and iv) from 1 to 10% by weight of one or more tripolyphosphate salts.