Cationically modified white pigments, their production and use

Details Cationically modified white pigments, their production and use Cationically modified white pigments, their production and use

C - Chemistry, Metallurgy

09

C

C09C 3/10 (2006.01) D21H 19/42 (2006.01) D21H 21/28 (2006.01)

Patent

CA 2389573

Cationically modified white pigments (W) in particulate form, essentially consisting of a particulate inorganic white pigment (M) of a particle size in the range of 0,1 to 40 µm and an applied water soluble, cationic, crosslinked polymer (P A) containing quaternary ammonium groups in salt form, obtainable by reaction of epichlorohydrin or of epichlorohydrin derivatives or precursors with amines, under conditions leading to at least partial crosslinking, optionally in combination with an anionic optical brightener (B) and where the molar ratio of (B) to (P A) is such that the number of cationic charges of the total polymer (PA) is higher than the number of anionic charges of the total anionic optical brightener (B), are surprisingly useful as cationic white pigments in various fields of technique, especially in papermaking.

L'invention concerne des pigments blancs (W) sous forme particulaire, modifiés de manière cationique, essentiellement composés d'un pigment blanc inorganique particulaire (M) dont les particules mesurent entre 0,1 et 40 mu m, et d'un polymère (PA) réticulé cationique appliqué, soluble dans l'eau, contenant des groupes ammonium quaternaires sous forme de sels, pouvant être obtenu par réaction d'épychlorhydrine, de dérivés d'épychlorhydrine ou de précurseurs, avec des amines, sous des conditions produisant une réticulation au moins partielle, éventuellement en combinaison avec un azureur optique anionique (B), le rapport molaire de (B) sur (PA) étant tel que le nombre de charges cationiques du polymère total (PA) est supérieur au nombre de charges anioniques de l'azureur optique anionique (B) total, et lesdits pigments blancs étant très utiles en tant que pigments blancs cationiques dans diverses applications techniques, en particulier dans la fabrication de papier.

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