Patent ID: 6555220
Filing Date: 2003-04-29
Classification: D01F,Y10T

Abstract:
A polytrimethylene terephthalate composite fiber characterized in that the composite fiber is a plurality of single filament which comprises two kinds of polyester components laminated to each other in a side-by-side manner or an eccentric sheath-core manner, at least one of which components is polytrimethylene terephthalate and the composite fiber satisfies the following conditions (1) to (4):(1) the content of trimethylene terephthalate cyclic dimer in polytrimethylene terephthalate is 2.5 wt % or less, (2) the fiber-fiber dynamic friction coefficient is from 0.2 to 0.4, (3) the degree of intermingling is from 2 to 60 point/m and/or the number of twists is from 2 to 60 T/m, and (4) the fiber size fluctuation U% is 1.5% or less.