Abstract: An epoxy resin composition contains a curing agent A, a curing agent B, a curing agent C, an epoxy resin D, an epoxy resin E, and resin particles F, wherein the curing agent A is an aromatic polyamine having a substituent selected from an alkyl group, an aromatic group, and a halogen group at each of two ortho positions of an amino group, the curing agent B is an aromatic polyamine that is liquid at 25° C., and the curing agent C is an aromatic polyamine having only one electron donating substituent or no substituent at an ortho position of an amino group, the epoxy resin D is constituted by an epoxy resin which is composed of a monomer containing 4 or more glycidyl groups, and the epoxy resin E is constituted by an epoxy resin which is composed of a monomer containing 2 or 3 glycidyl groups.

Abstract: 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.

Abstract: 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.

Abstract: 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 1×105 to 1×109 rad/sec in a measurement at 25° C.

Abstract: An object of the invention is to provide a thermoplastic resin prepreg that gives a fiber-reinforced composite material with excellent mechanical strength even through molding at a low temperature within a short period of time. The thermoplastic resin prepreg of the invention is a thermoplastic resin prepreg including at least a reinforcing fiber substrate and a thermoplastic resin composition partially or completely impregnated in the reinforcing fiber substrate. The thermoplastic resin prepreg is configured such that the thermoplastic resin composition contains 50 mass % or more of polyetherketoneketone (PEKK) based on the total thermoplastic resin composition, and is a thermoplastic resin composition having a crystallization enthalpy of 22 J/g or more as measured by a differential scanning calorimeter (DSC) at a cooling rate of 50° C./min from 400° C.

Abstract: The present invention provides an epoxy compound indicated by chemical formula (1) (in chemical formula (1), X indicates a C1-10 aliphatic hydrocarbon group, R1 and R2 each 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)

Abstract: The present invention provides an epoxy compound indicated by chemical formula (1) (in chemical formula (1), X indicates a C1-10 aliphatic hydrocarbon group, R1 and R2 each 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.

Abstract: 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.

Abstract: 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.

Abstract: 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 R1 to R4 each independently represent a group selected from a hydrogen atom, an alkyl group, a cycloalkyl group and an aryl group.

Abstract: 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.

Abstract: A process for production of a plant-derived component-containing polycarbonate represented by the following formula (3): (wherein R1-R4 each 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.

Abstract: 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.

Abstract: 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.

Abstract: A resin composition comprising 100 parts by weight of a polycarbonate of which a specific ether diol residue constitutes 40-100 mol % and 1-40 parts by weight of polylactic acid, wherein the polylactic acid is composed of a poly-L-lactic acid component and a poly-D-lactic acid component, and wherein in the melting peak derived from the polylactic acid component during temperature increase for measurement with a differential scanning calorimeter (DSC), the proportion of the melting peak area for 195° C. and above is at least 60% of the sum of the melting peak area for 195° C. and above (high temperature) and the melting peak area for 140-180° C. (low temperature), as determined by measurement of the melting peak derived from the polylactic acid component during temperature increase with a differential scanning calorimeter (DSC).

Abstract: 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 R1 to R4 each independently represent a group selected from a hydrogen atom, an alkyl group, a cycloalkyl group and an aryl group.

Abstract: A polycarbonate resin composition, which comprises a plant-derived component, has improved properties such as improved moldability, biodegradability, water-absorbing property, impact resistance, melt flow characteristics, density, transparency and the like, exhibits less environmental load and is excellent in recycling efficiency is disclosed. The polycarbonate resin composition of the present invention comprises 30 to 95 parts by weight of component A (a polycarbonate comprising a plant-derived component) and 5 to 70 parts by weight of component B (an acrylate resin, a biodegradable resin, an aromatic polyester, a polyolefin or a rubber-modified styrene resin) (provided that the total of the component A and the component B is 100 parts by weight).

Abstract: A process for production of a plant-derived component-containing polycarbonate represented by the following formula (3): (wherein R1-R4 each 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 diol represented by the following formula (1), 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: (wherein R1-R4 each independently represent a group selected from among hydrogen, alkyl, cycloalkyl and aryl), and a carbonic acid diester represented by the following formula (2), 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: (wherein R5 and R6 are groups selected from among alkyl, cycloalkyl and aryl, and R5 and R6 may be the same or different groups).

Abstract: 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 related to a resin composition comprising 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.

Abstract: A polycarbonate resin which shows a high content of biogenic matter and has excellent heat resistance, heat stability and moldability, and a manufacturing process thereof. The polycarbonate resin contains a recurring unit represent by the following formula (1) as the major constituent, and has (i) a specific viscosity of a solution prepared by dissolving 0.7 g of the resin in 100 ml of methylene chloride at 20° C. of 0.20 to 0.45, (ii) a glass transition temperature (Tg) of 150 to 200° C., and (iii) a 5% weight loss temperature (Td) of 330 to 400° C.