Optical brightener for aqueous high yield pulp and process...

Details Optical brightener for aqueous high yield pulp and process... Optical brightener for aqueous high yield pulp and process...

D - Textiles, Paper

21

H

D21H 17/66 (2006.01) D21H 21/30 (2006.01)

Patent

CA 2496289

Paper is brightened by addition of a tetrakis(hydroxyalkyl) phosphonium ("THP") salt in an amount greater than 0.04% but no more than 5% by weight in wet pulp. The amount of THP salt added is sufficient to enhance the brightness of paper made from fibers in the wood pulp to a desired brightness level. The THP salt is commercially available and previously used as a fire retardant and a biocide. Though particularly useful in the production of brightened cellulose fibers of high yield pulp, with the benefit of generally improving opacity, the process may be used to treat all wet pulp which is to be brightened.

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