Pigment concentrate

Details Pigment concentrate Pigment concentrate

C - Chemistry, Metallurgy

09

D

C09D 167/00 (2006.01) C08J 3/22 (2006.01) C09B 67/20 (2006.01) C09D 5/03 (2006.01) C09D 17/00 (2006.01)

Patent

CA 2360075

Method for preparing a pigment concentrate which is suitable, in particular, for the preparation of a powder coating. The pigment concentrate is prepared by pigment particles being comminuted in the presence of an aqueous binder essentially consisting of a polyester having a glass transition temperature of at least 60 ~C and an acid value of at least 60, to form a stable paste or suspension, the said paste or suspension formed being subjected to a drying treatment, and the pigment concentrate being collected. The binder used is preferably free of cosolvent, while expediently it is a resin having an acid value of at least 70. Preferably, no dispersant is used. By using a pigment concentrate formed according to the present method, a powder coating can be formed which no longer has a tinting strength reserve.

L'invention concerne un procédé pour l'élaboration d'un concentré de pigments, particulièrement approprié à la préparation d'un revêtement en poudre. Le concentré est obtenu par fragmentation de particules de pigment en présence d'un liant aqueux qui comprend essentiellement un polyester à température de transition vitreuse d'au moins 60· C et à valeur acide d'au moins 60. On forme ainsi une pâte ou une suspension stable soumise ensuite au séchage, puis on recueille le concentré. De préférence, le liant est dépourvu de co-solvant, et il est bon d'utiliser comme liant une résine à valeur acide d'au moins 70. De préférence, on n'utilise aucun dispersant. Le concentré considéré permet de préparer un revêtement en poudre dépourvu de réserve de pouvoir colorant.

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