Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1991-05-30
1992-12-15
Ryan, Patrick J.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
428373, B23B 2700
Patent
active
051716330
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an elastic core and sheath type composite filament yarn consisting of a polyurethane core component and a non-polyurethane thermoplastic elastomer sheath component, more particularly, to a novel composite elastic filament yarn which free from tackiness, an important defect of polyurethane elastomer yarns, very easy to handle in succeeding steps such as spinning, yarn processing, knitting, weaving, dyeing, finishing or the like and having excellent heat resistance, and to a process for preparing the same.
BACKGROUND ART
Polyurethane elastomer yarns have been used in diversified field with the excellent physical properties thereof being utilized. However, these yarns pose problems of tackiness, difficulties in taking-up during spinning and a low workability in succeeding steps such as various yarn processings, knitting, weaving, or the like. A measure to solve the above problems has been an approach from application of oiling agents, for example, oiling agents predominantly comprising dimethyl silicone and a metallic soap admixed therewith, oiling agents predominantly comprising mineral oil and a monoamine admixed therewith, or the like (Japanese Patent Publications Nos. 40-5,557 and 46-16,321). However, an improvement through oiling has been recognized to a certain extent but limited and imperfect. Namely, in the case of spinning and taking-up, if the tackiness of the yarns are reduced, the take-up operation tends to be unable to be continued for a long time due to cobwebbing, yarn package collapsing, etc. This tendency becomes conspicuous with an increase of the take-up speed (for example, to 500 m/min. or more) and with a decrease of the diameter of the bobbin (for example, 100 mm or less) during take-up.
On the other hand, if the yarns are made to be tacky, a long time take-up operation will be capable of being conducted, but serious troubles in succeeding steps will occur due to difficulties in yarn unwinding. Alternatively, the application of oil makes textile products uneven due to yarn tension variations caused by white powder deposition onto yarn guides, knitting needles or the like during yarn post-processing and knitting or weaving steps.
As another method for preventing the sticking of yarns, we proposed in Japanese Patent Publication No. 61-14,245, a process for preparing a core and sheath type polyurethane elastomer filament yarn consisting of a polyurethane sheath and a crosslinked polyurethane core. Such a polyurethane core and polyurethane sheath type composite elastomer filament yarn has disadvantages during taking-up at a high speed for a long time on a small diameter bobbin during spinning, unwinding in the axial direction from a bobbin as ordinary nylon or polyester yarns, and yarn handling in succeeding steps. Further, such a yarn is somewhat disadvantageous in heat resistance.
Alternatively, there have been known polyester-based elastomers as a different kind of thermoplastic elastomers. The polyester-based elastomers have been used in diversified fields because of some of the excellent properties thereof and, among other thermoplastic elastomers, have an advantage of being usable in a wide temperature range from high temperatures to low temperatures. Moreover, these elastomers have an improved load-bearing property, a high flexural fatigue resistance and excellent oil and chemical resistances. As with polyurethanes, if the proportion of hard segments is increased, the hardness thereof will increase and the elastic recovery will decrease, while if the proportion of soft segments is increased, the softness and rubbery elasticity will increase but the heat resistance will deteriorate. Elastic yarns obtained from such a polyester-based elastomer are generally required to have a high proportion of soft segments in order to have, an increased elastic recovery which, on the other hand, gives them a poor heat resistance due to a low melting point.
Further, the thus obtained yarns, since they are extremely inferior to ordinary polyurethane e
REFERENCES:
patent: 4604320 (1986-08-01), Okamoto et al.
Fujimoto Masami
Morishige Yoshiaki
Muramoto Yasuo
Yoshimoto Kiyoshi
Kanebo Ltd.
Ryan Patrick J.
Weisberger Richard C.
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