Patent ID: 6039767
Filing Date: 2000-03-21
Classification: C09B,D06P,Y10S

Abstract:
A method of dyeing a polypropylene based material modified with an ethylene copolymer, comprising:preparing various disperse dye dispersions each comprising an individual disperse dye at a known dye concentration;contacting undyed polypropylene material samples with each of the various disperse dye dispersions to produce a plurality of dyed polypropylene material samples;testing the dyed polypropylene samples to determine crocking the characteristics for each of the various disperse dyes;for each of various disperse dyes, determining a maximum dye concentration which will produce an acceptable crocking test;for each of various disperse dyes within a common primary color group, selecting a plurality of disperse dyes each substantially at its determined maximum dye concentration;combining the selected plurality of disperse dyes to form a primary color dye mix;preparing a disperse dye mix dispersion from the primary color dye mix; andcontacting undyed polypropylene material with the disperse dye mix dispersion to dye the polypropylene material.