Abstract Composite filaments and yarns having excellent spinnability, dyeability and crimp developing properties, and exhibiting improved properties such as a small bulk density after development of crimps, a lower number of breakages in the monofilament or yarn during spinning, reduced deep dyeing defects, improved natural draw ratio, and development of fine, uniform helical crimps are obtained by melt-spinning component (A) a mixture, preferably having Mw/Mn of more than 2.5 selected from (i) mixtures obtained by continuously mixing an end product in the molten state obtained by a multi-step continuous polycondensation reaction with at least one intermediate product in the molten state occurring in this polycondensation reaction system, and (ii) mixtures obtained by continuously mixing at least two of said intermediate products, and component (B) at least one polymer having a viscosity different from that of component (A).
The process of claim 1 wherein said melt-spinning is carried out using a spinning orifice having a cross sectional area of 0.33 to 28 mm2.
Claim 2
Dependent Claim
18 words
The process of claim 1 wherein said component (A) has an Mw/Mn ratio of not more than 10.
Claim 3
Dependent Claim
21 words
The process of claim 3 wherein said component (B) is the same mixture as component (A) having a different mixing ratio.
Claim 4
Dependent Claim
38 words
The process of claim 3 wherein said component (B) is the same mixture as component (A) but at least one intermediate product contained therein has a different viscosity from that of the intermediate product contained in component (A).
Claim 5
Dependent Claim
18 words
The process of claim 3 wherein said component (B) consists of said end product contained in component (A).
Claim 6
Dependent Claim
24 words
The process of claim 1 wherein said linear condensation products are selected from the group consisting of linear polyamides, linear polyesters and linear polyureas.