Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1993-01-13
1994-05-03
Ryan, Patrick J.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
428370, 428374, 264171, D02G 300, D02G 304
Patent
active
053086970
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a composite filament having an excellent potentially elastic stretchability and recoverability, specifically a composite filament wherein a fiber-forming polymer having an excellent elastic stretchability and recoverability is conjugated with another fiber-forming polymer readily soluble in water or an aqueous alkali solution and less stretchable than the above polymer, so as to restrain a part of the elastic stretchability and recoverability of the former by the latter; a manufacturing process thereof; and a process for developing an excellent elastic stretchability and recoverability of textile structures comprising such a composite filament, for example, yarns, fabrics, secondary products thereof, or the like, by subjecting the textile structures to a treatment with water or an aqueous alkali solution. In this description and the appended claims, the term "readily soluble in water" should be understood to mean a quality of being substantially soluble in hot water and an aqueous alkali solution, and the term "readily soluble in an aqueous alkali solution" should be understood to mean a quality of being soluble in an aqueous alkali solution but being hardly or not soluble in hot water. Further, the term "water treatment" should be understood to include "an aqueous alkali solution treatment".
2. Background Art
Polyurethane elastomer yarns have been used in diversified fields in view of excellent physical properties thereof. However, due to their characteristics such as tackiness, high elongation, low modulus, or the like, these yarns have posed problems in abilities of being taken up during spinning and of yarn handling and operating in succeeding steps such as various yarn processings, knitting, weaving, and the like.
In order to decrease the tackiness, attempts have been made mainly by means of oiling agents. For example, oiling agents predominantly comprising dimethyl silicone admixed with a metallic soap or monoamines, and so forth, have been proposed in Japanese Patent Publication Nos. 5,557/65 and 16,312/71. Alternatively, as another method for preventing the tackiness, we, the present inventors, have proposed in Japanese Patent Publication No. 14,245/86 a manufacturing process of core and sheath type polyurethane based, elastic composite filaments comprising a urethane sheath and a crosslinked polyurethane core.
Further, as a different method for improving a yarn handling ability in succeeding steps, mention may be made of processes for decreasing elongation of polyurethane elastomer yarns, such as by covering with nylon yarns or the like, or hot or cold drawing. Furthermore, Japanese Patent Publication No. 8,606/80 discloses a composite filament having a potential rubber-like elasticity, composed of a water-soluble polyamide predominantly comprising a polybis(propoxy)ethaneadipamide conjugated with a polyurethane, which can develop its rubber-like elasticity by water treatment.
Among the above, an effect of improvement by means of oiling has been recognized to a certain extent but is limited and not perfect. Namely, suppose the case of spinning and taking-up on a take-up roll, if the tackiness of the yarns are reduced, the take-up operation tends to become impossible to continue for a long time due to cobwebbing, collapsing, etc. of the yarn package. This tendency becomes remarkable with increasing take-up speed (for example, to 500 m/min. or more) and with decreasing diameter of the yarn package (for example, to 100 mm or less) during taking-up. In contrast, if the yarns are made tacky, a long time take-up operation will be able to be conducted, whereas a serious trouble in succeeding steps will occur due to difficulties in yarn unwinding. Thus, only a delicate control of oiling agents does not necessarily cope with the difficulties.
Alternatively, in the case of elastic, urethane-urethane type core and sheath composite filaments, difficulties have been encountered in winding at a high speed on bobbins of a small diameter, in unwindi
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Fujimoto Masami
Matsutomi Tamotsu
Morishige Yoshiaki
Muramoto Yasuo
Naito Hiroshi
Edwards N.
Kanebo Ltd.
Ryan Patrick J.
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