Patent ID: 6284036
Filing Date: 2001-09-04
Classification: C04B,C09B

Abstract:
A process for pigmenting a porous sintered material comprising a boride, carbide, silicide, nitride or phosphide compound with an organic pigment by(a) treating said sintered material with a solution or melt of a soluble pigment precursor such that at least part of the pigment precursor enters its pores, and(b) forming said organic pigment within the pores, through thermal fragmentation of the pigment precursor that has entered the pores of the sintered material in accordance with treatment (a), by means of heating,wherein said soluble pigment precursor is a compound of the formula (I) or a mixture of 2 or more compounds of the formula (I)A(B).sub.x (I),in which x is an integer from 1 to 8,A is the radical of a chromophore of the quinacridone, anthraquinone, perylene, indigo, quinophthalone, indanthrone, isoindolinone, isoindoline, dioxazine, azo, phthalocyanine or diketopyrrolopyrrole series which is attached to x groups B via one or more heteroatoms selected from the group consisting of N, O and S and forming part of the radical A,B is hydrogen or a group of the formula ##STR48##where at least one group B is not hydrogen and, if x is from 2 to 8, the groups B can be identical or different, andL is any suitable solubilizing group.