Patent ID: 8623991
Filing Date: 2014-01-07
Classification: D01F,D04B,Y10T

Abstract:
1. A process of providing a copolyester fiber with improved pilling resistance and dye uptake comprising a copolyester copolymer having isophthalic acid, terephthalic acid and glycol moieties in which all of said copolyester copolymer has substantially the same isophthalic acid content, comprising the steps of: a) selecting a level weight proportion of isophthalic acid to maintain in said copolymer, said level weight being in the range of about 0.8% to about 12% of the total copolymer weight; b) providing isophthalic acid, terephthalic acid and glycol; c) copolymerizing the isophthalic acid, terephthalic acid and glycol while controlling the proportion of isophthalic acid and terephthalic acid to constantly maintain the selected weight level while forming the copolymer; and d) forming fibers from said copolymer whereby a fiber with improved piling resistance properties is produced and wherein fabrics produced from said fibers have 20% to 25% greater dye uptake when compared to a homo-polymer fabric.