Organically aftertreated pigments for paint systems

Details Organically aftertreated pigments for paint systems Organically aftertreated pigments for paint systems

C - Chemistry, Metallurgy

09

C

C09C 1/36 (2006.01) C09C 3/04 (2006.01) C09C 3/06 (2006.01) C09C 3/08 (2006.01) C09D 7/12 (2006.01) C09D 17/00 (2006.01)

Patent

CA 2362443

According to the invention, high-quality titanium dioxide pigments which are especially suited for water-dilutable high-gloss dispersion paints can be produced by means of a double organic aftertreatment. An organic compound (I) is, before final grinding, applied as a grinding aid to the untreated or already inorganically aftertreated particles, and an organic compound (II) is, after grinding, applied as a special dispersing and wettability aid. An adaptation of organic compound (II) to the matrix by altering the HLB value does not influence the degree of grinding any longer, rather it positively influences the degree of distribution of pigment particles in the matrix thus leading to an improved dispersion and to a higher gloss.

Cette invention concerne la production de pigments de dioxyde de titane de qualité supérieure par retraitement organique double consistant à appliquer un composé organique (I), servant d'adjuvant de broyage, sur les particules non traitées ou déjà retraitées organiquement, avant le broyage final, puis à appliquer un composé organique (II) servant d'adjuvant dispersant et mouillant spécial, après le broyage. Ces pigments sont particulièrement adaptés aux laques en dispersion à haut brillant qui sont diluables dans l'eau. Une adaptation du composé organique (II) sur la matrice par modification du rapport hydrophile/lipophile n'influe plus sur le degré de broyage, mais influe de façon positive sur le degré de répartition des particules de pigment dans la matrice et conduit ainsi à une meilleure dispersion et à une brillance plus éclatante.

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