Teijin Limited

Akimichi Oda

Eiichi Kitazono

Hiroaki Kuwahara

Toshiyuki Miyake

Takanori Miyoshi

Masami Kinoshita

Mizuho Saito

Hironori Kawamoto

Hideshi Kurihara

Katsuhiko Hironaka

Shinichiro Shoji

Kiyotsuna Toyohara

Tomoyoshi Yamamoto

Ryuji Nonokawa

Suguru Ozawa

Hidekazu Yoshikawa

Hideaki Tominaga

Taisuke Fujimoto

A carbon fiber bundle having a high abrasion resistance property and simultaneously being excellent in widening property is provided by a carbon fiber bundle with an adhered sizing agent including a carbon fiber bundle, and a sizing agent adhered to a surface of the carbon fiber bundle, wherein the sizing agent contains an epoxy compound, and shows an intersection of a storage modulus and a loss modulus at an angular frequency in the range of 1×10to 1×10rad/sec in a measurement at 25° C.

Carbon fiber bundle with adhered sizing agent

According to the present invention, there is provided a prepreg characterized by including a reinforcing fiber substrate composed of a reinforcing fiber, and an epoxy resin composition with which the reinforcing fiber substrate is partially or wholly impregnated, in which the epoxy resin composition includes, as an essential component, an epoxy resin, an amine-based curing agent, and a polyamide particle, the epoxy resin composition includes, as an optional component, an epoxy resin-soluble thermoplastic resin; and an epoxy group is introduced to the surface of the polyamide particle, and/or at least one of the epoxy resin, the amine-based curing agent, and the epoxy resin-soluble thermoplastic resin, included in the epoxy resin composition, partially permeates into the polyamide particle.

Prepreg, method for producing same, and method for producing fiber-reinforced composite material

The present invention provides an epoxy compound indicated by chemical formula (1) (in chemical formula (1), X indicates a C1-10 aliphatic hydrocarbon group, Rand Reach independently indicate one selected from the group consisting of a hydrogen atom, an aliphatic hydrocarbon group, an aromatic group, an alkoxy group, and a halogen atom) 

Epoxy compound, epoxy resin, epoxy resin composition, cured resin product, prepreg, fiber-reinforced composite material, and production methods for these

Provided is a fiber containing a composition obtained by mixing a compound having at least a ring structure containing one carbodiimide group, the first nitrogen and second nitrogen thereof being linked together through a linking group, with a polymer compound having an acidic group. Also provided is a fiber structure made thereof. A fiber and a fiber structure, which have improved hydrolysis resistance and from which no free isocyanate compounds are produced, can be provided.

Fiber and fiber structure

A process for the preparation of a polycarbonate containing a plant-derived component excellent in hue by using a plant-derived anhydrosugar alcohol represented by the following formula (1) or a composition thereof as a raw material: wherein Rto Reach independently represent a group selected from a hydrogen atom, an alkyl group, a cycloalkyl group and an aryl group.

Polycarbonate containing plant-derived component and process for the preparation thereof

A process for production of a plant-derived component-containing polycarbonate represented by the following formula (3): (wherein R-Reach independently represent a group selected from among hydrogen, alkyl, cycloalkyl and aryl, and n is the number of repeating units), by melt polycondensation using as the starting materials a specified diol, having a total content of Na, Fe and Ca of no greater than 2 ppm and a purity analysis value of at least 99.7% by gas chromatography, and a specified carbonic acid diester, having a total content of Na, Fe and Ca of no greater than 2 ppm and a purity analysis value of at least 99.7% by gas chromatography.

An object of the present invention is to provide a polycarbonate resin composition which has a high content of biogenic matter and is excellent in heat resistance, heat stability, moldability, hue and transparency. The present invention relates to a resin composition including 0.0005 to 0.5 part by weight of at least one heat stabilizer (component S) selected from the group consisting of phosphorus-based heat stabilizers (PS) and hindered phenol-based heat stabilizers (HS) based on 100 parts by weight of a polycarbonate resin (component A) which contains a recurring unit represented by the following formula (1) as the main constituent, and a molded article thereof: 

Polycarbonate resin composition

The object of the invention is to provide plant-derived component-containing polycarbonates with improved color tone, and a process for their production. This object of the invention is achieved by reducing the inorganic impurities in the polymer starting material and by reducing the inorganic impurities in the polymer product.

Growing community of inventors

Iwakuni, Japan

Akimichi Oda