Abstract: There is provided a prepreg containing carbon fibers and a matrix resin, where the matrix resin contains an epoxy resin, a curing agent, a monofunctional (meth)acrylate monomer having a molecular weight of 200 or more, and a polyfunctional (meth)acrylate monomer.

Abstract: Provided are a prepreg and an epoxy resin composition that can shorten the combustion time of a molded article. The present invention comprises a prepreg which is formed by impregnating a carbon fiber base material with an epoxy resin composition, wherein the epoxy resin composition comprises component (A): an organic phosphinate metal salt, component (B): an epoxy resin having an oxazolidone structure, and component (C): an imidazole compound or an imidazole compound derivative, and may comprise component (D) a urea compound.

Abstract: The present invention pertains to a prepreg containing reinforcing fibers and an epoxy resin composition. Said prepreg is sandwiched between dies preheated to 140.degree.C. and pressurized to MPa and held for five minutes at this temperature to obtain a cured article having a G?Tg of at least 150.degree.C. The present invention also pertains to a fiber-reinforced composite material and a method for producing same. According to this invention, it is possible to provide a prepreg which is well suited to press-molding, particularly to high-cycle press-molding. It is also possible to provide a fiber-reinforced composite material which can be heat-cured at a lower temperature and over a shorter time than conventional methods, with which it is possible to minimize excessive flow of resin in hot-press curing, and which is resistant to performance defects such as fiber meandering and defects in surface appearance. A method for producing the same can also be provided.

Abstract: The present invention is an epoxy resin composition characterized by containing component A (epoxy resin containing sulfur atoms in the molecule thereof); and component B (an epoxy resin composition containing an imidazole compound represented by formula (1), and at least one of the following components: component C (an imidazole compound represented by formula (2) below) or component D (an epoxy resin composition having at least one sulfur atom in the molecule. According to the present invention, it is possible to provide an epoxy resin composition which has outstanding stability when stored at room temperature, and which can be heat-cured at a relatively low temperature and over a short time, to give a resin with a high heat resistance when cured. (In formula (1), R1 represents a straight-chain or branched-chain alkyl group having 1 to 5 carbon atoms, or a hydroxymethyl group, R2 represents a straight-chain or branched-chain alkyl group having 1 to 5 carbon atoms, or a hydrogen atom.

Abstract: An epoxy-resin composition of the components (A), (B), (D) and (E), where component (A) is an epoxy resin having an oxazolidone-ring structure, (B) is a bisphenol bifunctional epoxy resin with a number-average molecular weight of at least 600 but no more than 1300, which does not have an oxazolidone-ring structure, (D) is a triblock copolymer, and (E) is a curing agent. A film made of the epoxy-resin composition, a prepreg and a fiber-reinforced plastic is also disclosed. The epoxy resin composition is capable of achieving both a processability of a prepreg at room temperature and a suppression of voids in the molded product. A fiber-reinforced plastic having excellent mechanical properties, especially excellent fracture toughness and heat tolerance, is also obtained by using the epoxy-resin composition.

Abstract: The present invention relates to an epoxy-resin composition comprising the following components (A), (B), (C) and (D), a film made of the epoxy resin composition, a prepreg and a fiber-reinforced plastic. The present invention can provide an epoxy-resin composition that cures at a low temperature in a short period of time. Also, the present invention can provide a fiber-reinforced plastic having excellent mechanical characteristics, especially excellent fracture toughness and heat tolerance, is made from the epoxy-resin composition. component (A): an epoxy resin having a monomer unit represented by formula (1) in the molecule; component (B): a bifunctional epoxy resin with a number-average molecular weight of at least 600 but no greater than 1300, which does not have a monomer unit represented by formula (1) below in the molecule; component (C): a triblock copolymer; and component (D): a curing agent.

Abstract: Provided is a method for producing a good epoxy resin composition for obtaining fiber-reinforced plastics. A production method for obtaining a fiber-reinforced composite material by impregnating a fiber assembly with an epoxy resin composition and then curing the epoxy resin composition, wherein the epoxy resin composition contains a component [A], a component [B] and a component [C] respectively satisfying the conditions described below. When the blending amount of the component [B] is set to b parts by mass and the blending amount of the component [C] is set to c parts by mass relative to 100 parts by mass of the component [A] contained in the epoxy resin composition, formula (2) is satisfied within the range of formula (1), formula (4) is satisfied within the range of formula (3), and formula (6) is satisfied within the range of formula (5).

Abstract: The present invention relates to An epoxy-resin composition comprising the following components (A), (B), (C) and (D), a film made of the epoxy resin composition, a prepreg and a fiber-reinforced plastic. The present invention can provide an epoxy-resin composition that cures at a low temperature in a short period of time. Also, the present invention can provide a fiber-reinforced plastic having excellent mechanical characteristics, especially excellent fracture toughness and heat tolerance, is made from the epoxy-resin composition. component (A): an epoxy resin having a monomer unit represented by formula (1) in the molecule; component (B): a bifunctional epoxy resin with a number-average molecular weight of at least 600 but no greater than 1300, which does not have a monomer unit represented by formula (1) below in the molecule; component (C): a triblock copolymer; and component (D): a curing agent.

Abstract: An epoxy-resin composition of the components (A), (B), (D) and (E), where component (A) is an epoxy resin having an oxazolidone-ring structure, (B) is a bisphenol bifunctional epoxy resin with a number-average molecular weight of at least 600 but no more than 1300, which does not have an oxazolidone-ring structure, (D) is a triblock copolymer, and (E) is a curing agent. A film made of the epoxy-resin composition, a prepreg and a fiber-reinforced plastic is also disclosed. The epoxy resin composition is capable of achieving both a processability of a prepreg at room temperature and a suppression of voids in the molded product. A fiber-reinforced plastic having excellent mechanical properties, especially excellent fracture toughness and heat tolerance, is also obtained by using the epoxy-resin composition.

Abstract: The present invention pertains to a prepreg containing reinforcing fibers and an epoxy resin composition. Said prepreg is sandwiched between dies preheated to 140.degree.C and pressurized to MPa and held for five minutes at this temperature to obtain a cured article having a G?Tg of at least 150.degree.C. The present invention also pertains to a fiber-reinforced composite material and a method for producing same. According to this invention, it is possible to provide a prepreg which is well suited to press-molding, particularly to high-cycle press-molding. It is also possible to provide a fiber-reinforced composite material which can be heat-cured at a lower temperature and over a shorter time than conventional methods, with which it is possible to minimize excessive flow of resin in hot-press curing, and which is resistant to performance defects such as fiber meandering and defects in surface appearance. A method for producing the same can also be provided.

Abstract: The present invention is an epoxy resin composition characterized by containing component A (epoxy resin containing sulfur atoms in the molecule thereof); and component B (an epoxy resin composition containing an imidazole compound represented by formula (1), and at least one of the following components: component C (an imidazole compound represented by formula (2) below) or component D (an epoxy resin composition having at least one sulfur atom in the molecule. According to the present invention, it is possible to provide an epoxy resin composition which has outstanding stability when stored at room temperature, and which can be heat-cured at a relatively low temperature and over a short time, to give a resin with a high heat resistance when cured. (In formula (1), R1 represents a straight-chain or branched-chain alkyl group having 1 to 5 carbon atoms, or a hydroxymethyl group, R2 represents a straight-chain or branched-chain alkyl group having 1 to 5 carbon atoms, or a hydrogen atom.

Abstract: Provided is a method for producing a good epoxy resin composition for obtaining fiber-reinforced plastics. A production method for obtaining a fiber-reinforced composite material by impregnating a fiber assembly with an epoxy resin composition and then curing the epoxy resin composition, wherein the epoxy resin composition contains a component [A], a component [B] and a component [C] respectively satisfying the conditions described below. When the blending amount of the component [B] is set to b parts by mass and the blending amount of the component [C] is set to c parts by mass relative to 100 parts by mass of the component [A] contained in the epoxy resin composition, formula (2) is satisfied within the range of formula (1), formula (4) is satisfied within the range of formula (3), and formula (6) is satisfied within the range of formula (5).

Abstract: Layers are thermally bonded with each other while retaining a conformation of fibers of nonwoven fabrics made of synthetic resin, by heating at a heatproof temperature or higher, using a vapor of water or a nonaqueous solvent in a high-pressure steam sterilizer or a high-pressure steam pot. Then, three nonwoven fabrics made of synthetic resin which consist of different materials are superposed to form three layers, and can be thermally bonded together by heating at the heatproof temperature or higher, using the high-pressure steam sterilizer. A laminated body has layers thermally bonded together while retaining a conformation of fibers of each of a nonwoven fabric A made of synthetic resin, a nonwoven fabric B made of synthetic resin and a nonwoven fabric C made of synthetic resin.

Abstract: A prepreg is provided capable of being a composite material having suitable high heat resistance, impact resistance, and mechanical properties under high temperature and high humidity conditions. As the matrix resin, a composition including a specific epoxy resin component (A), a specific bifunctional epoxy resin (B), a specific tetrafunctional epoxy resin (C), and a specific aromatic amine compound (D) at specific proportions are used. Particularly, as the epoxy resin component (A), one obtained by mixing and heating a bifunctional epoxy resin (a1), a trifunctional epoxy resin (a2), a phenol compound (a3), and a specific polyamide resin (a4) is used so as to be able to solve the above-described problems.

Abstract: Attention has been focused on combining two types of dental impression materials of different qualities which has not been considered in conventional combined impression, and a dental impression film and a method of manufacturing the dental impression film are provided for making the two parts joinable. The dental impression film is formed of a polyethylene film and polyethylene/polyester films. The polyethylene film has, laminated by thermal adhesion on opposite surfaces thereof, respectively, the polyethylene/polyester films having bonding capability between a silicone impression material and an alginate impression material. The dental impression film having bonding capability is interposed between the silicone impression material and alginate impression material.

Abstract: A prepreg is provided capable of being a composite material having suitable high heat resistance, impact resistance, and mechanical properties under high temperature and high humidity conditions. As the matrix resin, a composition including a specific epoxy resin component (A), a specific bifunctional epoxy resin (B), a specific tetrafunctional epoxy resin (C), and a specific aromatic amine compound (D) at specific proportions are used. Particularly, as the epoxy resin component (A), one obtained by mixing and heating a bifunctional epoxy resin (a1), a trifunctional epoxy resin (a2), a phenol compound (a3), and a specific polyamide resin (a4) is used so as to be able to solve the above-described problems.

Abstract: In a process control data base, intermediate characteristics, processing condition for controlling a characteristic and a final characteristic in a process of manufacturing products are stored as a set of data for each product lot. In Process 1, a set of data for each product lot are prepared. Next, in Process 2, cluster processing is conducted on each set of data obtained in Process 1. In Process 3, using the set of data obtained in Process 2, the intermediate characteristics and the processing condition for controlling a characteristic are inputted and the final characteristic is outputted, and a causal relation between the input and output is quantified by a neural network so as to make a learning model. In a model applying stage, the most appropriate processing condition for controlling a characteristic is retrieved by using the learning model and the intermediate characteristics in the previous steps.

Abstract: In a process control data base, intermediate characteristics, processing condition for controlling a characteristic and a final characteristic in a process of manufacturing products are stored as a set of data for each product lot. In Process 1, a set of data for each product lot are prepared. Next, in Process 2, cluster processing is conducted on each set of data obtained in Process 1. In Process 3, using the set of data obtained in Process 2, the intermediate characteristics and the processing condition for controlling a characteristic are inputted and the final characteristic is outputted, and a causal relation between the input and output is quantified by a neural network so as to make a learning model. In a model applying stage, the most appropriate processing condition for controlling a characteristic is retrieved by using the learning model and the intermediate characteristics in the previous steps.