Process for the coloration of polyamides with pigments derived from carboxyamido-polyimides

Claim 1

Process for the coloration of a linear polyamide which comprises effecting polycondensation of at least one amide monomer and a pigment that is insoluble in organic solvents, said pigment being of the polycyclic polycarboximide series containing 2 primary amine or haloformyl functional groups, wherein the pigment has the formula: ##STR7## wherein R represents the tetravalent residue of a substituted mono- or poly-cyclic aromatic hydrocarbon or a substituted or unsubstituted perinone, R 1 represents a substituted or unsubstituted aliphatic, benzene, naphthalene or heterocyclic radical, R 2 represents a substituted or unsubstituted aliphatic, aromatic or heterocyclic radical and Y represents an amino or haloformyl group; said pigment being copolycondensed in the polymer chain of said polyamide; wherein the proportion of said pigment is from 1%. (1 to 1000) to 2% (2 per 100) by weight of the monomer or monomers; and said at least one monomer is selected from the group consisting of 11-amino-undecanoic acid; ε-caprolactam; p-phenylenediamine, decamethylenediamine or hexamethylenediamine together with terephthalic, isophthalic, adipic or sebacic acid.