Patent ID: 8461229
Filing Date: 2013-06-11
Classification: C08J,C08K,C09B

Abstract:
1. A method of producing a colored polyamide engineering plastic comprising a) preparing a pigment composition by mixing an organic pigment and a prepolymer in a liquid medium; and b) coloring a polyamide engineer plastic by processing together the pigment composition from a) and the polyamide engineering plastic at a temperature of about 220 to 350 ° C.; wherein the pigment composition comprises solid particles, which particles comprise from 20 to 75% by weight of an organic pigment and from 80 to 25% by weight of a crosslinked polymer, each based on the total weight of the solid particles, wherein the prepolymer has average molecular weight M  and (b1) hydroxy, epoxy or primary or secondary amino groups or (b2) unsaturated bonds, wherein R wherein the organic pigment is selected from the group consisting of pyrrolo[3,4-c]pyrroles of the formula  wherein R  R  imidazolyl, pyrazolyl, triazolyl, piperazinyl, pyrrolyl, oxazolyl, benzoxazolyl, benzothiazolyl, benzimidazolyl, morpholinyl, piperidinyl or pyrrolidinyl, preferably hydrogen, halogen, cyano, carbamoyl, nitro, trifluoromethyl, phenyl, C R R R pyrimidopteridines of formula wherein R R R