Patent ID: 6733543
Filing Date: 2004-05-11
Classification: D06P,G02B

Abstract:
A process of dyeing a molded article comprising the steps of(i) immersing at least a portion of said article in a dyeing bath maintained at a temperature of 90 to 99Â° C. and (ii) retaining said portion in said bath for a period of time sufficient to allow an amount of dye to diffuse into said article, and (iii) removing said article from said bath, wherein molded article comprises at least one polymeric resin selected from the group consisting of (co)polyester, (co)polycarbonates, acrylonitrile-butadiene-styrene, polyamide, polyurethane, polyalkyl(meth)acrylate, allyldiglycol carbonate and styrene copolymers, and wherein the bath contains(a) 50 to 90 pbw relative to the weight of the bath of water (b) 0.1 to 15 pbw of dye (c) 2.5 to 20 pbw of at least one plasticizing agent conforming to Râ€²â€”[(O(CH2)m)nâ€”]OH where Râ€² is an ethyl, propyl or butyl radical,m is 2, 3 or 4, and n is 1, 2 or 3 with the proviso that where Râ€² is butyl m is 2 or 4 and(d) 5 to 30 pbw of at least one leveling agent conforming structurally to Hâ€”[(O(CH2)m)nâ€”]OH where m is 2, 3 or 4 andn is 1, 2, or 3.