Patent ID: 6495079
Filing Date: 2002-12-17
Classification: D01F,Y10T

Abstract:
A process to prepare a colored synthetic polyamide or polyester fiber with improved color strength that comprises melt blending a polyamide or polyester resin, a colorant, 0.5-30% of an alkylene aryl polyester sulfonate salt copolymer having metal sulfonate units represented by the formula: or the formula: (M+nO3S)d-A-(ORâ€³OH)p where p=1-3, d=1-3, p+d=2-6, n=1-5, and A is an aryl group containing one or more aromatic rings where the sulfonate substituent is directly attached to an aryl ring, Râ€³ is a divalent alkyl group and the metal sulfonate group is bound to the polyester through ester linkages, forming said melt blend into filaments and drawing said filaments into fibers, and wherein the metal sulfonate salt copolymer is insoluble in water.