Additive composition for paper making

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 17/29 (2006.01) D21H 17/46 (2006.01) D21H 17/55 (2006.01) D21H 21/20 (2006.01)

Patent

CA 2336801

The object of the present invention is an additive composition for paper making which is added to the pulp prior to web formation in order to increase the wet strength of the web. The basic component of the composition is a component made from starch, which to its molecular weight has been thinned to a viscosity level of 10 to 400 (5 %, 60 °C, Brookfield) which by solution cationizing using a quaternary nitrogen compound is cationized to a charge of < 4 mEkv/g, the composition containing at least one additional component, such as; 1) a starch-based polymer dispersion which contains starch and a monomeric graft copolymer, which product comprises, calculated form the dry-matter content of the product; a) 5 to 40 % of starch, having a cationic charge of 0.01 to 1 and an intrinsic viscosity of > 1.0 dl/g, b) 60 to 95 % of a monomer mixture containing at least one vinyl monomer and having a film formation temperature of 0 to 70 °C of a polymer formed therefrom, and water, and/or 2) polyamide epichlorhydrin resin (PAAE).

La présente invention concerne une composition pour la fabrication du papier que l'on ajoute à la pâte à papier avant formation de bande afin d'augmenter la robustesse de cette dernière à l'état humide. L'élément de base de la composition est l'amidon qui, en termes de masse moléculaire, a été diluée à un niveau de viscosité compris entre 10 et 400 (5 %, 60 DEG C, Brookfield) et qui, par cationisation de la solution au moyen d'un composé azoté quaternaire, est cationisé à une charge inférieure à 4mEkv/g. De plus, cette composition renferme au moins un composant tel que 1) une dispersion polymère à base d'amidon renfermant de l'amidon et un copolymère greffé monomère, lequel comprend, en valeur calculée à partir de la teneur en matière sèche du produit a)de 5 à 40 % d'amidon avec une charge cationique de 0,01 à 1 et une viscosité intrinsèque supérieure à 1,0dl/g, b) de 60 à 95 % d'un mélange monomère contenant au moins un monomère de vinyle, avec une température filmogène comprise entre 0 et 70 DEG C pour un polymère obtenu à partir de ce mélange monomère, et de l'eau, et 2) une résine épichlorhydrine polyamide.

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