Du Pont Toray Company Limited

Toray Industries, Inc.

Du Pont Toray

Masao Umezawa

Hideki Nakanishi

Toshikazu Matsuda

Shiro Imai

Shingo Ito

Toshio Tsubota

Tsutomu Watanabe

Miyoshi Okamoto

Masahi Hara

Tsutomu Wanatabe

Hiroshi Nishikawa

Toshihiro Tanaka

A low set (at low temperatures) spandex, based on copoly(alkylene ethers), which are copolymers containing tetramethylene ether and either ethylene ether or 1,2-propylene ether moieties, is provided.

Spandex having low set at low temperatures

The present invention provides a process whereby high quality, well-coalesced spandex can be made by dry-spinning a high-melting thermoplastic polyurethane, bundling the as-spun filaments into a side-by-side relationship, and passing the bundled filaments over or through a guide. The spandex made by this method has high-heat settability, high denier uniformity, good knittability and weavability, and provides fabrics having good surface uniformity.

Coalesced multifilament spandex and method for its preparation

Dry-spun polyurethane-based spandex &reg; containing 1-10 weight percent poly(vinylpyrrolidone) and a process of their preparation, are provided.

Process for the manufacture of spandex and the spandex made thereby

A process for melt-spinning solution-polymerized polyurethanes, based on polvether glycols and MDI at an addition ratio of 1.8 to 6.0, glycol chain extenders and a chain terminator to produce number average molecular weights of the polyurethanes of 40,000-150,000, and 5-2500 decitex spandex made thereby, are provided.

Process for making melt-spun spandex

The present invention relates to polyurethane based fiber containing 0.1-25 percent poly(vinylidene fluoride) and a method of making the same.

Polyurethane fiber containing poly(vinylidene fluoride)

A viscosity-stable solution of a polyurethaneurea, in the substantial absence of viscosity stabilizers, and spandex dry-spun therefrom, prepared from certain polyether glycols and aliphatic diisocyanates and ethylene diamine, are provided.

Stable polyurethaneurea solutions

The present invention provides a process whereby high quality, well-coalesced spandex can be made by dry-spinning a high-melting thermoplastic polyurethane, bundling the as-spun filaments into a side-by-side relationship, and passing the bundled filaments over or through a guide. The spandex made by this method has high heat-settability, high denier uniformity, good knittability and weavability, and provides fabrics having good surface uniformity.

A process for preparing durable dry-spun, polyurethane fiber exhibiting a small angle X-ray scattering pattern that forms a layer line scattering image or an eyebrow-shaped four dot scattering image is provided. The fiber is particularly useful in pantyhose, undergarments and the like.

Process of making polyurethane fiber

A durable dry-spun, polyurethane fiber exhibits a small angle X-ray scattering pattern that forms a layer line scattering image or an eyebrow-shaped four dot scattering image. The fiber is particularly useful in pantyhose, undergarments and the like.

Durable polyurethane fiber and method for the manufacture thereof

Polyphenylene sulfone fibers mainly consisting of a structural unit represented by a general formula ##STR1## (x is 0 or 1 or 2) wherein x, the average value of x, is 1.0 to 2.0, and a method for production thereof. These fibers are prepared by modifying polyphenylene sulfide fibers, whose specific surface area and degree of orientation are more than 0.4 m.sup.2 /g and more than 70%, respectively, to polyphenylene sulfone fibers represented by a main constituting unit with organic peroxides. These fibers have excellent heat and chemical resistance.

Method for production of polyphenylene sulfone fibers

Polyphenylene sulfone fibers mainly consisting of a structural unit represented by a general formula ##STR1## (x is 0 or 1 or 2) wherein x, the average value of x, is 1.0 to 2.0, and a method for production thereof. These fibers are prepared by modifying polyphenylene sulfide fibers, whose specific surface area and degree of orientation arr more than 0.4 m.sup.2 /g and more than 70%, respectively, to polyphenylene sulfone fibers represented by a main constituting unit ##STR2## with organic peroxides. These fibers have excellent heat and chemical resistance.

Polyphenylene sulfone fibers and a method for production thereof

In a methd for producing a soft sheet material containing thinned fibers or filaments and a viscoelastic substance, the improvement comprising:

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Shiga, Japan

Masao Umezawa