Papermaking internal sizing agent and use thereof

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 17/41 (2006.01) D21H 21/16 (2006.01)

Patent

CA 2697109

To provide a papermaking internal sizing agent capable of efficiently imparting sizing performance even in neutral papermaking which uses calcium carbonate as filler, and uses no aluminum sulfate or uses a small amount of aluminum sulfate, and also provide a paper or a paperboard obtained by using the papermaking internal sizing agent. The papermaking internal sizing agent comprises as an effective ingredient an amphoteric copolymer having hydrophobic groups and cationic groups, at least a part of the cationic groups being quaternized. Preferably, the amphoteric copolymer is obtained by polymerizing monomer ingredients that it essentially contain a hydrophobic monomer (A), a cationic monomer (B), and an anionic monomer (C) and that an anion equivalent of the monomer (C) is 0.1 to 90% of a cation equivalent of the monomer (B), in which a rate of quaternizing of the cationic groups is not less than 40% by mole. The paper or the paperboard contains the above papermaking internal sizing agent.

L'invention vise à proposer une colle interne pour la fabrication de papier qui contient du carbonate de calcium en tant que matériau de charge et qui peut communiquer efficacement un effet de collage, même dans une fabrication de papier neutre, le sulfate d'aluminium n'étant pas utilisé ou une quantité réduite de sulfate d'aluminium étant utilisée ; et le papier et le carton produit à l'aide de la colle. Le but est atteint par une colle interne pour la fabrication de papier qui contient en tant que principe actif un copolymère amphotère qui porte des groupes hydrophobes et dont les groupes cationiques passent au moins partiellement par une quaternarisation, dont l'un est préparé, de préférence, par la polymérisation d'un composant monomère comportant en tant qu'éléments essentiels un monomère hydrophobe (A), un monomère cationique (B) et un monomère anionique (C), la valeur d'équivalent anionique due au monomère (C) correspondant à 0,1 à 90 % de la valeur d'équivalent cationique due au monomère (B), et ayant un degré de quaternisation des groupes cationiques supérieur ou égal à 40 % en moles ; et un carton ou un papier, contenant la colle.

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