Nissan Motor Company Limited

Tanaka Kikinzoku Kogyo K.k.

Toray Industries, Inc.

Kaneka Corporation

Tokyo Institute of Technology

Kao Corporation

Mitsui Chemicals, Inc.

Polyplastics Co., Ltd.

Takeshi Kikutani

Hiroshi Tabata

Susumu Shimizu

Kinya Kumazawa

Katsumi Morohoshi

Akio Sakihara

Wataru Takarada

Noriyuki Suzuki

Takashi Ochi

Akira Kishiro

Mototada Fukuhara

Atsushi Taniguchi

Tetsuya Minami

Hidetoshi Okawa

Takahiko Sugaya

Manabu Matsui

Ryuji Fukuda

Sarah Siti

Kozo Iiba

Sho Hatano

Manabu Kao Corporation Matsui

A nonwoven fabric, including fibers, in which the fibers have an elongational viscosity, as measured under conditions at an elongational strain rate of 2.5&#xd7;10(1/s) and a temperature of 160&#xb0; C., of from 430 Pa&#xb7;s to 1200 Pa&#xb7;s, and a ratio of the elongational viscosity (Pa&#xb7;s) to a shear viscosity (Pa&#xb7;s) of the fiber, as measured under conditions at a shear strain rate of 2.5&#xd7;10(1/s) and a temperature of 160&#xb0; C., is from 35 to 65.

Nonwoven fabric and filter

An objective is to improve the spinnability and the productivity and increase the tensile strength of a polyester fiber containing polyhydroxyalkanoate. Disclosed is a biodegradable aliphatic polyester fiber containing a polyhydroxyalkanoate, a nucleating agent, and a lubricant, wherein the nucleating agent contains pentaerythritol, and the lubricant contains at least one of behenic amide, stearic acid amide, erucamide, oleic amide, and a combination thereof.

Biodegradable aliphatic polyester fiber and method for producing the same

An object of the present invention is to improve spinnability, productivity, and tensile strength of a polyester fiber containing poly(3-hydroxybutyrate-co-3-hydroxyhexanoate). By spinning the polyester resin containing the poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) at a high spinning velocity, the spinnability, productivity, and tensile strength of the polyester fiber can be improved.

Polyester fiber

A heat fusible conjugate fiber produced by high-speed melt spinning is disclosed. The conjugate fiber is composed of a first resin component having an orientation index of 40% or higher and a second resin component having a lower melting or softening point than the melting point of the first resin component and an orientation index of 25% or lower. The second resin component is present on at least part of the surface of the fiber in a lengthwise continuous configuration. The conjugate fiber preferably has a heat shrinkage of 0.5% or less at a temperature higher than the melting or softening point of the second resin component by 10&#xb0; C.

Hot-melt conjugate fiber

Polyoxymethylene fiber having a high strength and a high modulus of elasticity is provided. Polyoxymethylene fiber comprising polyoxymethylene copolymer having a half-crystallization time of at least 30 sec, when the polyoxymethylene copolymer is cooled from a melted state at 200&deg; C. to 150&deg; C. at a cooling speed of 80&deg; C./min and maintained constantly at the temperature of 150&deg; C.

Polyoxymethylene fiber and method for production thereof

A method of manufacturing fibers with optical function includes spinning a thermoplastic polymer by a spinneret having an opening with first slits arranged parallel to each other and a second slit arranged perpendicular thereto, the spinneret being formed to satisfy a predetermined relation between the length of the first slits and the width of the second slit.

Method of manufacturing fibers with optical function

A process for preparing highly oriented undrawn core-sheath type conjugated polyester fibers including the step of spinning a polyester as the sheath polymer and a polymer having a larger gradient of elongational viscosity with the temperature than that of the sheath polymer as a core polymer at a spinning speed of about 4000 to 12000 m/min.

Process for producing highly oriented undrawn polyester fibers

A spinneret for manufacturing modified cross-section fibers with optical function includes tubes arranged to a spinneret for spinning an island portion, and a partition device for enclosing the tubes for leading a melt polymer. The spinneret and the partition device cooperating with each other to define a predetermined space.

Spinneret for manufacturing modified cross-section fibers with optical

A spinneret for manufacturing modified cross-section fibers with optical function includes a middle spinneret for spinning an island portion, which has a base and an opening for extruding a melt polymer for forming an island portion. A partition device is mounted to the middle spinneret to partition the opening thereof, the partition device having an opening communicating with the opening of the middle spinneret which protrudes-from the base thereof.

A highly oriented undrawn polyester fiber which is crystalline such that the fiber is capable of exhibiting a diffraction peak observable in a wide angle X-ray diffraction image of the fiber and has a birefringence of 0.015 to 0.05. A process for preparing highly oriented undrawn core-sheath type conjugated polyester fibers including the step of spinning a polyester as the sheath polymer and a polymer having the larger gradient of elongational viscosity with the temperature than that of the sheath polymer at a spinning speed of about 4000 to 12000 m/min. A textured yarn made of said highly oriented undrawn polyester fibers and a process for preparing the textured yarn.

Growing community of inventors

Tokyo, Japan

Takeshi Kikutani