Patent ID: 7931745
Filing Date: 2011-04-26
Classification: C01P,C04B,C09C

Abstract:
1. A black pigment/auxiliary combination consisting essentially of: one or more inorganic black pigments selected from the group consisting of iron oxide black, iron-manganese mixed oxides, and spinel mixed-phase pigments; and one or more organic auxiliaries selected from the group consisting of modified carboxylates, polyvinyl acetates, copolymers of vinyl acetate, partly or completely hydrolysed polyvinyl alcohols, alkyl phosphates in the form of their alkali metal salts, alkyl phosphonates in the form of their alkali metal salts, alkyl sulphates in the form of their alkali metal salts, alkyl sulphonates in the form of their alkali metal salts, and mixtures thereof, wherein the organic auxiliaries are added in an amount of 0.01% by weight to 20% by weight calculated as active substance based on the amount of the inorganic black pigments present, wherein the black pigment/auxiliary combination results in a relative colour strength of ≧110%, based on the amount of black pigment present according to a building material colour test, wherein said black pigment/auxiliary combination is produced by a process selected from the group consisting of spray granulation, fluidized-bed granulation and compaction granulation, and wherein said black pigment/auxiliary combination is in granule form and is homogeneous.