Toray Industries, Inc.

Toray Coatex Co., Ltd.

Yukihiro Matsuzaki

Makoto Nishimura

Hajime Nishimura

Satoshi Yanagisawa

Hiroyasu Kato

Kuniyasu Shiro

Masaru Ueno

Katsuya Okajima

Ryuji Shikuri

Shunichiro Nakai

Tomoharu Hirose

Hisashi Murahara

Makoto Kaneko

Akito Kuroda

Makato Nishimura

Makoto Sumida

Masaharu Wada

Shunichi Kimura

Shunichoro Nakai

Koji Yamano

Yu Matsuoka

The present invention provides a sheet-like material having soft texture, durability capable of withstanding practical use, and abrasion resistance. The sheet-like material of the present invention is a sheet-like material containing a nonwoven fabric composed of an ultrafine fiber having an average single fiber diameter 0.3 to 7 &#x3bc;m; and an elastic resin, wherein the elastic resin is a polyurethane resin (D) which contains: as essential constituent monomers, a copolymerized polycarbonate diol (A1) which contains a structural unit derived from C3-5 alkane diol (a1) and a structural unit derived from C8-12 alkane diol (a2), the molar ratio of the alkanediol (a2) with respect to the total number of moles of the alkanediol (a1) and the alkanediol (a2) being 50 to 95 mole %; a polycarbonate diol (A2) containing a structural unit derived from a C4-6 alkane diol (a3); an organic diisocyanate (B); and a chain extender (C), and the polyurethane resin (D) satisfies the following conditions (1) to (3):

Sheet-like material

A sheet material has good mechanical properties, flexibility, lightweight properties, and quality, and also relates to a production method therefor. The sheet material includes, as constitutional components, an elastic polymer and nonwoven fabric composed mainly of ultrafine hollow fiber with an average monofilament diameter in the range of 0.05 to 10 &#x3bc;m, the ultrafine hollow fiber containing 2 to 60 hollows.

Sheet material and manufacturing method thereof

A base body for an artificial leather includes an intertwined fiber body mainly including an ultrafine fiber having a 0.01 to 10 &#x3bc;m fiber diameter and an elastic polymer, the ultrafine fiber including, as a constituent polymer, a polyester obtained from a dicarboxylic acid and/or an ester-forming derivative thereof, and a diol, the polyester containing 15 to 500 ppm of a 1,2-propanediol-derived component.

Base body for artificial leather

A sheet like article produced from a polyurethane resin has a carbonate group and an oxycarbonyl group as ester groups and has uniform, elegant surface quality, a flexible, highly crease recoverable texture, and high resistance to light and hydrolysis, and also provided is a production method therefore. The sheet like article is produced by adding, as a binder, a polyurethane resin that meets requirements (I) and (II) to a fibrous base material formed mainly of ultrafine fibers: (I) a polyurethane resin such that the polyurethane resin contains, in its interior, an oxycarbonyl group and a carbonate group as ester groups; (II) a polyurethane resin such that the sum of the content of the urethane group and the content of the urea group in the polyurethane resin is 7.0 to 11.0 mass %.

Sheet-like article

The present invention provides a conjugated fiber suitable for use as a crimped fiber capable of producing an artificial leather having highly dense texture and good quality. The present invention also provides a base body for an artificial leather and an artificial leather produced by using such conjugated fiber. The conjugated fiber of the present invention includes a conjugated fiber comprising a readily soluble polyester component and a less readily soluble component, and the readily soluble polyester component comprises a copolymerized polyester having 5 to 10% by mole of 5-sodium sulfoisophthalate copolymerized therewith and the readily soluble polyester component contains a polyalkylene glycol. The polyalkylene glycol is in the form of streaks extending in longitudinal direction of the fiber in the longitudinal cross section of the conjugated fiber.

Conjugated fiber, base body for artificial leather, and artificial leather

A sheet-shaped object which is thin and, despite this, has a surface that is dense and is soft to the touch and which has practicable strength and a process for producing the sheet-shaped object are disclosed. This sheet-shaped object comprises ultrafine fibers having an average single-fiber diameter of 0.1-7 &#x3bc;m and a polymeric elastomer comprising a polyurethane as a major component, wherein when a layer extending from one surface to a depth of 50% of the thickness is referred to as layer (A) and a layer extending from the other surface to a depth of 50% of the thickness is referred to as layer (B), then the ratio of the density of fibers (A') in the layer (A) to the density of fibers (B&#x2032;) in the layer (B) satisfies the following expression (a) and the ratio of the density of the polymeric elastomer comprising a polyurethane as a major component (A&#x2033;) in the layer (A) to the density thereof (B&#x2033;) in the layer (B) satisfies the following expression (b). The sheet-shaped object as a whole has a density of 0.2-0.6 g/cm. 1&#x3e;(A&#x2032;)/(B&#x2032;)&#x2267;0.5 (a) 1&#x3e;(A&#x2033;)/(B&#x2033;)&#x2267;0.6 (b).

Sheet-shaped object and process for producing same

A polishing pad is provided with a compression elastic modulus of 0.17 MPa or more and 0.32 MPa or less produced by preparing a nonwoven fabric formed of bundles of ultrafine fibers with an average monofilament diameter of 3.0 &#x3bc;m or more and 8.0 &#x3bc;m or less, preparing a polishing pad base by impregnating the nonwoven fabric with a polyurethane based elastomer in an amount of 20 mass % or more and 50 mass % or less relative to the mass of the polishing pad base, and laminating the polishing pad base with a porous polyurethane layer containing wet-solidified polyurethane as primary component which has openings with an average opening diameter of 10 &#x3bc;m or more and 90 &#x3bc;m or less in its surface to serve as polishing surface layer.

Polishing pad

Growing community of inventors

Gifu, Japan

Yukihiro Matsuzaki