Method for producing cellulose fiber having improved...

D - Textiles – Paper – 21 – C

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D21C 9/00 (2006.01) C04B 18/24 (2006.01) D06M 11/56 (2006.01) D06M 13/463 (2006.01) D06M 16/00 (2006.01) D21H 21/36 (2006.01)

Patent

CA 2405354

A cellulose fiber having extended biostability and the method of its manufacture are described. While prior treatments of cellulose with biotoxic metal compounds have given improved resistance to decay, these treatments have not been entirely satisfactory where the fiber had to be refined before use. Refining energy was very high and fiber length loss was substantial. Treatment of cellulose fiber with didecyldimethylammonium chloride (DDAC) or bromide (DDAB), these materials in combination with low levels of copper, or low levels of copper alone, has given a product with very good biostability without a major increase in refining energy or loss of fiber length. The treated fiber is particularly advantageous as a reinforcing component for cement board products.

L'invention concerne une fibre de cellulose ayant une biostabilité accrue et son procédé de sa fabrication. Les traitements antérieurs de la cellulose avec des composés métalliques biotoxiques ont donné une résistance améliorée à la détérioration, mais ces traitements n'ont pas été entièrement satisfaisants lorsque la fibre devait être raffinée avant son utilisation. L'énergie nécessaire au raffinement était très importante et la perte de la longueur des fibres était conséquente. Le traitement de la fibre de cellulose avec du chlorure (CDDA) ou du bromure (BDDA)de didécyldiméthylammonium en combinaison avec de faible niveaux de cuivre, ou bien de faibles niveaux de cuivre seul, ont donné un produit ayant une très bonne biostabilité sans une augmentation majeure d'énergie de raffinement ou de perte de longueur des fibres. La fibre ainsi traitée est particulièrement avantageuse en tant que composé de renforcement pour les produits comme les panneaux de ciment.

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