C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 33/02 (2006.01) C01B 15/037 (2006.01) C11D 3/37 (2006.01) C11D 3/39 (2006.01) D21C 9/16 (2006.01) C08L 67/04 (2006.01)
Patent
CA 2509692
The present invention relates to a polymer composition for peroxide bleaching of a cellulosic fibre material, said composition being in the form of a stable aqueous polymer solution obtained by bringing in an aqueous medium a first polymer (A) comprising a partly or totally acidic homopolymer of acrylic acid, methacrylic acid or maleic acid, or a copolymer of acrylic acid and/or methacrylic acid with an unsaturated dicarboxylic acid, into contact with a second polymer (B) comprising a po9lylactone of a poly-alfa-hydroxyacrylic acid in solid form or as a moist powder or as a slurry, said polymer solution having a pH of at most 8, The invention also relates to peroxide bleaching processes.
La présente invention concerne une composition polymère de blanchiment au péroxyde d'une matière de fibres cellulosiques. Cette composition se présente sous la forme d'une solution polymère aqueuse stable que l'on obtient en mettant, dans un milieu aqueux, un premier polymère (A) contenant un homopolymère d'acide acrylique, d'acide méthacrylique ou d'acide maléique partiellement ou complètement acide ou un copolymère d'acide acrylique et/ou d'acide méthacrylique avec un acide dicarboxylique insaturé, en contact avec un deuxième polymère (B) contenant un acide poly-alfa-hydroxyacrylique sous forme solide ou en tant que poudre mouillée ou boue, cette solution polymérique ayant un pH maximal de 5. L'invention concerne également les procédés de blanchiment au péroxyde.
Ahlgren Jonni
Haermae Timo
Jaekaerae Jukka
Paren Aarto
Renvall Ilkka
Gowling Lafleur Henderson Llp
Kemira Oyj
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