GB1088045A - Polyamide pigment compositions - Google Patents

Abstract

The invention comprises powdered compositions of a synthetic linear polyamide, a carbonaceous pigment which is insoluble in the polyamide and an organic pigment derivative having secondary or tertiary amino-groups in which particles of pigment and pigment derivative are enveloped in polyamide. Polyamides specified are nylon 6 and nylon 66. 50-1000% based on the weight of pigment may be used. Pigments specified include carbon black, copper and nickel phthalocyanine and substituted derivatives thereof, e.g. copper tetra-(tolylmercapto)phthalocyanine, the bis-iminazole from perylene - 3,4,9,10 - tetracarboxylic acid and o-phenylene diamine, bis-methylimide of perylene - 3,4,9,10 - tetracarboxylic acid and the bis(3,5-dimethylphenyl)imide of perylene-3,4,-9,10-tetracarboxylic acid. The pigment derivative may be of formula <FORM:1088045/C3/1> where A is a pigment residue, R1 is H, alkyl or hydroxyalkyl, R2 is alkyl, cycloalkyl, hydroxyalkyl, aminoalkyl, aralkyl and n=1-5. Alternatively it may be a polymeric product in which 2 or more pigment residues are linked by divalent nitrogen containing groups. 1-20% may be used. Derivatives specified include copper tris(isopropylaminomethyl)phthalocyanine, copper tris(cyclohexylaminomethyl)phthalocyanine, copper tris(phenylaminomethyl) - phthalocyanine, copper tris(isopropylaminomethyl) - tetra(tolylmercapto)phthalocyanine, bis (isopropylaminomethyl) isodibenzanthrone, a polymer from copper chloromethylphthalocyanine and copper tris(isopropylaminomethyl)-phthalocyanine and a polymer from copper tris (b - aminoethylaminomethyl) phthalocyanine and copper tris(chloromethyl)phthalocyanine. The composition may be prepared by dispersing the pigment in a solution of the polyamide in a water-soluble aliphatic acid, the solution also containing the pigment derivative, and adding a non-solvent to cause precipitation. The solvent may be 85-100% formic acid. The non-solvent may be alcohol, acetone or less than 50% formic acid. The dispersion may be prepared by gravel milling or by agitation with glass beads or sand. The precipitated material may be filtered off and dried or slurried with water before being applied to polyamide moulding granules. Reference has been directed by the Comptroller to Specification 838,668.ALSO:Polyamide moulding granules may be coated with a composition comprising a synthetic linear polyamide, a carbonaceous pigment which is insolube in the polyamide and an organic pigment derivative having secondary or tertiary amino-groups in which particles of pigment and pigment derivative are enveloped in polyamide. Polyamides specified are nylon 6 and nylon 66. 50-1000% based on the weight of pigment may be used. Pigments specified include carbon black, copper phthalocyanine, nickel phthalocyanine, copper tetra (tolylmercapto) phthalocyanine, the bis-iminazole from perylene-3,4,9,10-tetracarboxylic acid and ophenylene diamine, the bis-methylimide of perylene -3,4,9,10-tetracarboxylic acid and the bis(3,5-dimethylphenyl) imide of perylene-3,4, 9,10-tetracarboxylic acid. The pigment derivative may be of formula: <FORM:1088045/B1-B2/1> where A is a pigment residue, R1 is H, alkyl or hydroxyalkyl, R2 is alkyl, cycloalkyl, hydroxyalkyl, amino-alkyl, aralkyl and n=1-5. Alternatively it may be a polymeric product in which 2 or more pigment residues are linked by divalent nitrogen containing groups. 1-20% may be used. Derivatives specified include copper tris(isopropylamino-methyl) phthalocyanine, copper tris(cyclohexylaminomethyl) phthalocyanine, copper tris(phenylaminomethyl) phthalocyanine, copper tris(isopropylaminomethyl) tetra (tolylmercapto) phthalocyanine, bis(isopropylaminomethyl) isodibenzanthrone, a polymer of copper chloromethyl phthalocyanine and copper tris(isopropylaminomethyl) phthalocyanine and a polymer from copper tris(b -aminoethylaminomethyl) phthalocyanine and copper tris(chloromethyl) phthalocyanine. The composition composition dry or wet may be applied to the granules by tumbling. The granules may be spun into fibres. Reference has been directed by the Comptroller to Specification 838,668.