Mitsubishi Rayon Company, Limited

Other

Itsubishi Rayon Co., Ltd.

Hajime Itoh

Kazutami Mitani

Yuichi Fukui

Hiroshi Takahashi

Itsumi Muraoka

Shigeki Hagura

Jun Kamo

Hideaki Habara

Tsuruyoshi Matsumoto

Hiroshi Hosokawa

Tohru Takemura

Haruhiko Yoshida

Yasuyuki Fujii

Yoshihiro Nishihara

Gary J Capone

Kunihiro Aoki

Seizo Oishi

Naoto Ohsuga

Charles W Emerson

Masako Iwamoto

Kouji Ohbori

Takeo Hamazaki

Hiroaki Ohnishi

Teruhiko Sugimori

Kunio Iwase

Masakazu Hoshino

Toshio Nagasaka

Eizou Sakurai

Kouzi Ohbori

Kouji Takehashi

The present invention is directed to chitosan-containing acrylic fibers having a total chitosan content of 0.05 to 2% by weight and an extractable chitosan content of not less than 0.03% by weight to less than the total chitosan content. The antimicrobial activity of the chitosan-containing acrylic fibers of the present invention can persist for a long period of time and is not deteriorated even when subjected to posttreatments, such as dyeing and bleaching of fibers, and treatments in usual service environments of fiber products, such as washing and ironing.

Chitosan-containing acrylic fibers and process for preparing the same

Process of making chitosan-containing acrylic fibers

A floppy disk in which the binder for fixing a magnetic substance in the recording layer of the magnetic disk is a polyester polyurethane and the liner of the jacket contains an acrylic fiber and in addition a fiber treating agent having a surface tension in a specific range. The floppy disk is excellent in workability, can be prepared in high yields because the number of dusts generated upon its preparation is small, and also is excellent in the permanence of recording performance.

Floppy disk

The present invention relates to a shaped material consisting of a layer having open microvoids (hereinafter referred to as light-scattering layer) and a layer having a hue different from that of the light-scattering layer (hereinafter referred to as color-developing layer), the light-scattering layer constituting at least part of the outer surface of the shaped material and the color-developing layer constituting the rest of the shaped material, which shaped material changes its color reversibly depending upon its moist or dry condition, as well as to a process for producing said shaped material.

Reversibly color-changing shaped material and process for producing the

Acrylonitrile copolymer, and fiber or core-sheath conjugate fiber

A water-repellent, hygroscopic conjugate fiber which has a water-repellency of at least 80 marks and an equilibrium moisture regain of at least 5% by weight at the standard conditions.

Water-repellent hygroscopic fiber

The present invention relates to an acrylonitrile copolymer comprising 70% by weight or more of an acrylonitrile monomer unit and 0.1-30% by weight of a fluoroalkyl methacrylate or fluoroalkyl acrylate monomer unit and having an intrinsic viscosity of 0.8-10, as well as to an acrylonitrile type core-sheath conjugate fiber using the above copolymer as the sheath component. The copolymer according to the present invention has water repellency by itself; accordingly, the above conjugate fiber prepared therefrom also exhibits water repellency permanently.

An acrylonitrile polymer film is disclosed which film comprising a polymer containing higher than 80% by weight of acrylonitrile units, having higher than 300,000 of weight average molecular weight, and having molar fraction Ne for the segment of polymerization initiator bonded to the terminal of the polymer satisfying the following equation:

Process for preparing acrylonitrile polymer film

Porous membranes and production processes thereof

Disclosed is a porous membrane consisting of a film-forming polymer characterized in that:

Porous membrane

The present invention discloses a hydrophilized porous membrane with a crosslinked hydrophilic polymer, which is composed principally of diacetone acrylamide, held physically on at least a part of the pore walls of a starting porous polyolefin membrane, as well as its production process. This hydrophilized porous polyolefin membrane has long-lasting hydrophilicity and good mechanical strength. Its components are dissolved out only minimally in application.

Hydrophilized porous membrane and production process thereof

Porous membranes are produced by dissolving a film-forming polymer in a good solvent for the polymer, forming a film of the resulting polymer solution, and forcibly contacting saturated steam or mist-containing steam with at least one surface of said film. Such porous membranes have pores having a narrow pore diameter distribution and extending in a direction substantially perpendicular to the membrane surface at a high surface pore density on at least one surface thereof.

Process for producing porous membranes

Disclosed are a multilayer composite hollow fiber comprising at least one nonporous separating membrane layer (A) performing a separating function and two or more porous layers (B) performing a reinforcing function, the layer (A) and the layers (B) being alternately laminated so as to give a structure having internal and external surfaces formed by the porous layers (B), as well as a method of making such a hollow fiber. In this multilayer composite hollow fiber, the separating membrane can be formed as an ultrathin, homogeneous membrane. Moreover, the separating membrane is not liable to get damaged owing to the unique structure of the hollow fiber. Furthermore, such hollow fibers can be readily and stably produced on an industrial scale.

Method of making multilayer composite hollow fibers

The present invention discloses a hydrophilized porous polyolefin membrane with a polymer of a monomer, which has an HLB value of 2-20, held on at least a part of the pore walls of a porous polyolefin membrane as well as its production process. This hydrophilized porous polyolefin membrane has long-lasting hydrophilicity and good mechanical strength.

Hydrophilized porous polyolefin membrane and production process thereof

Growing community of inventors

Otake, Japan

Hajime Itoh