Bleaching of cellulosic fibre material with peroxide using...

Details Bleaching of cellulosic fibre material with peroxide using... Bleaching of cellulosic fibre material with peroxide using...

D - Textiles, Paper

21

C

D21C 9/16 (2006.01) D06L 3/02 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2512141

The present invention relates to a process for bleaching a cellulosic fibre material with a peroxide compound in an aqueous alkaline medium, comprising a bleaching step wherein: a) a first polymer (A) comprising a homopolymer of acrylic acid, methacrylic acid or maleic acid, or a copolymer of acrylic acid and/or methacrylic acid with an unsaturated dicarboxylic acid, and a solution of a second polymer (B) comprising a poly-alfa-hydroxyacrylic acid or a salt thereof, are added to a cellulosic fibre material, and b) thereafter adding a peroxide compound and an alkaline substance and carrying out the bleaching.

La présente invention concerne un procédé de blanchiment d'une matière de fibres cellulosiques à l'aide d'un composé péroxyde dans un milieu alcalin aqueux. Ce procédé comprend une opération de blanchiment qui consiste a) à ajouter à une matière de fibres cellulosiques un première polymère (A) contenant un homopolymère d'acide acrylique, d'acide méthacrylique ou d'acide maléique ou un copolymère d'acide acrylique et/ou d'acide méthacrylique avec un acide dicarboxylique insaturé, et une solution d'un deuxième polymère (B) contenant un acide poly-alfa-hydroxyacrylique ou un sel de ce dernier puis b) à ajouter un composé péroxyde et une substance alcaline et à procéder au blanchiment.

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