Abstract: An object of the present invention is to provide a benzoxazine composition the cured product of which has excellent self-repairability. A benzoxazine composition in accordance with an embodiment of the present invention includes: a specific benzoxazine compound; and a specific compound having an epoxy group and/or a specific transesterification catalyst, so that the above object is achieved.

Abstract: A method for producing a methacrylic resin includes a polymerization step of polymerizing a monomer component having a methyl methacrylate content of 98% by mass or more in the presence of a polymerization initiator and a chain transfer agent. In the polymerization step, polymerization temperature is set to lower than 100° C. until 90% or more of the methacrylic resin to be obtained is formed. The polymerization initiator has a 10-hour half-life temperature of 45° C. or higher. An amount of the chain transfer agent used is 0.15 mol % or more with respect to a total amount of the monomer component. A ratio of a total molar amount of the chain transfer agent to a total molar amount of the polymerization initiator is 7.0 or more.

Abstract: A methacrylic resin includes a structural unit derived from methyl methacrylate in a proportion of 98% by mass or more. The methacrylic resin has a weight average molecular weight (Mw) as measured by gel permeation chromatography (GPC) of 400,000 or more, a triad syndiotacticity of 55% to 70% inclusive, a 5% weight loss temperature of 300° C. or higher, and a proportion of terminal double bonds to a structural unit derived from methyl methacrylate of less than 0.015 mol %. A method for producing the methacrylic resin is provided. A resin composition and a dope including the methacrylic resin, a resin film including the methacrylic resin, and a polarizing plate and a display device in which the resin film is used, are provided.

Abstract: A methacrylic resin includes structural units derived from methyl methacrylate at a ratio of 98% by mass or more, has a triad syndiotacticity of 55% or more, and contains a terminal structure that is derived from a polymerization initiator and is represented by formula (1). The ratio of terminal double bonds to the structural units derived from methyl methacrylate is less than 0.020 mol %. A method for producing the methacrylic resin is provided. In formula (1), each of R1, R2 and R3 independently represents an alkyl group, a substituted alkyl group, an ester group or an amide group, provided that at least one of R1, R2 and R3 represents an ester group or an amide group.

Abstract: An object of the present invention is to provide a benzoxazine composition the cured product of which has excellent self-repairability. A benzoxazine composition in accordance with an embodiment of the present invention includes: a product of reaction between a benzoxazine compound and a compound (ii) which contains at least two phenolic hydroxyl groups, and/or a mixture of the compounds (i) and (ii); and a specific crosslinking agent, so that the above problem is solved.

Abstract: The present invention provides an amide acid oligomer which has specific composition and which is capable of providing a cured product having excellent physical properties, in particular, an excellent glass transition temperature, etc.

Abstract: The present invention provides an amide acid oligomer which has specific composition and which is capable of providing a cured product having excellent physical properties, in particular, an excellent glass transition temperature, etc.

Abstract: An object of the present invention is to reduce or eliminate a defect (e.g., a void) by achieving (i) a semipreg and a prepreg each of which allows a reduction in residual volatile component and (ii) methods for producing the semipreg and the prepreg, respectively, and consequently to achieve (iii) a fiber-reinforced composite material which has high heat resistance and superior mechanical strength and a (iv) a method for producing the fiber-reinforced composite material. The present invention attains the above object by providing, for example, a semipreg containing: powders of an imide oligomer; and reinforcement fibers, the imide oligomer being represented by a specific general formula (1).

Abstract: In order to provide an imide oligomer or the like which can give a cured product exhibiting excellent thermal oxidative stability, an imide oligomer is obtained by reacting together an aromatic tetracarboxylic acid component, an aromatic diamine component, and a terminal capping agent. The imide oligomer contains, in a specified proportion: a compound containing a phenylethynyl group; and a compound containing no carbon-carbon unsaturated bond capable of an addition reaction. One or each of the aromatic tetracarboxylic acid component and the aromatic diamine component contains a component having an asymmetrical and non-planar structure.

Abstract: An object of the present invention is to reduce or eliminate a defect (e.g., a void) by achieving (i) a semipreg and a prepreg each of which allows a reduction in residual volatile component and (ii) methods for producing the semipreg and the prepreg, respectively, and consequently to achieve (iii) a fiber-reinforced composite material which has high heat resistance and superior mechanical strength and a (iv) a method for producing the fiber-reinforced composite material. The present invention attains the above object by providing, for example, a semipreg containing: powders of an imide oligomer; and reinforcement fibers, the imide oligomer being represented by a specific general formula (1).

Abstract: A terminally modified imide oligomer is represented by a specific formula including a 2-phenyl-4,4?-diaminodiphenylether residue or a 4-phenoxy-1,3-diaminobenzene residue. A varnish is obtained by dissolving the terminally modified imide oligomer. A cured product is obtained by heat-curing the terminally modified imide oligomer, and a film including the cured product has a tensile elongation at break of 10% or more. An imide prepreg is obtained by impregnating fibers with the varnish and then drying the impregnated fibers. A fiber-reinforced composite material is obtained by layering and then heat-curing the imide prepreg.

Abstract: A terminally modified imide oligomer is represented by a specific formula including a 2-phenyl-4,4?-diaminodiphenylether residue or a 4-phenoxy-1,3-diaminobenzene residue. A varnish is obtained by dissolving the terminally modified imide oligomer. A cured product is obtained by heat-curing the terminally modified imide oligomer, and a film including the cured product has a tensile elongation at break of 10% or more. An imide prepreg is obtained by impregnating fibers with the varnish and then drying the impregnated fibers. A fiber-reinforced composite material is obtained by layering and then heat-curing the imide prepreg.

Abstract: A driving tool includes a first cylinder that generates compressed air by reciprocating movement of a first piston slidably disposed therein. A longitudinal direction of the first cylinder intersects a longitudinal direction of a second cylinder and extends alongside a magazine that feeds fasteners onto an axis of movement of a driving part of a second piston. The first piston reciprocally slides in a direction that extends alongside the magazine. A tool handle is disposed on the side of the first cylinder that is opposite from the magazine in the direction of the axis of movement.

Abstract: A driving tool includes a first cylinder that generates compressed air by reciprocating movement of a first piston slidably disposed therein. A longitudinal direction of the first cylinder intersects a longitudinal direction of a second cylinder and extends alongside a magazine that feeds fasteners onto an axis of movement of a driving part of a second piston. The first piston reciprocally slides in a direction that extends alongside the magazine. A tool handle is disposed on the side of the first cylinder that is opposite from the magazine in the direction of the axis of movement.

Abstract: It is an object of the invention to provide a technique to further increase protection performance for a battery pack of power tool. A representative power tool may include a tool body to which a tool bit is coupled to perform a predetermined operation, a driving motor that is disposed within the tool body, a battery pack that supplies driving current to the driving motor, the battery pack being removably mounted to the tool body and placed on the outside of the tool body in an exposed state, and a protector that is removably mounted to the tool body to protect the battery pack. The protector may include a battery pack protection area that protects the battery pack mounted to the tool body when the protector is mounted to the tool body. The battery pack protection area is dosed on at least part of the outer surface of the battery pack with a clearance and prevents transmission of external force upon the battery pack protection area to the battery pack.

Abstract: An electric power tool is provided which prevents malfunction with excellent operability even when one operation mode among various modes is selectable. In a gear case of a housing, there are provided a clutch switching groove which engages with a connecting projection of a clutch switching lever, a slit which guides a guide body having a stepped pin which penetrates an impact switching groove to engage with an auxiliary ring, and a percussion switching groove which engages with a connecting projection of a percussion switching lever. In addition, a switching case is externally provided, so that combination of sliding positions of each switching member can be changed. As the switching case can be operated by a switching button, any of all operation modes, which are, a drill mode, an impact mode, a percussion drill mode, and a clutch mode can be selected with the switching button only.

Abstract: An electric power tool is provided which prevents malfunction with excellent operability even when one operation mode among various modes is selectable. In a gear case of a housing, there are provided a clutch switching groove which engages with a connecting projection of a clutch switching lever, a slit which guides a guide body having a stepped pin which penetrates an impact switching groove to engage with an auxiliary ring, and a percussion switching groove which engages with a connecting projection of a percussion switching lever. In addition, a switching case is externally provided, so that combination of sliding positions of each switching member can be changed. As the switching case can be operated by a switching button, any of all operation modes, which are, a drill mode, an impact mode, a percussion drill mode, and a clutch mode can be selected with the switching button only.

Abstract: An electric power tool is provided which prevents malfunction with excellent operability even when one operation mode among various modes is selectable. In a gear case of a housing, there are provided a clutch switching groove which engages with a connecting projection of a clutch switching lever, a slit which guides a guide body having a stepped pin which penetrates an impact switching groove to engage with an auxiliary ring, and a percussion switching groove which engages with a connecting projection of a percussion switching lever. In addition, a switching case is externally provided, so that combination of sliding positions of each switching member can be changed. As the switching case can be operated by a switching button, any of all operation modes, which are, a drill mode, an impact mode, a percussion drill mode, and a clutch mode can be selected with the switching button only.

Abstract: An electric power tool is provided which prevents malfunction with excellent operability even when one operation mode among various modes is selectable. In a gear case of a housing, there are provided a clutch switching groove which engages with a connecting projection of a clutch switching lever, a slit which guides a guide body having a stepped pin which penetrates an impact switching groove to engage with an auxiliary ring, and a percussion switching groove which engages with a connecting projection of a percussion switching lever. In addition, a switching case is externally provided, so that combination of sliding positions of each switching member can be changed. As the switching case can be operated by a switching button, any of all operation modes, which are, a drill mode, an impact mode, a percussion drill mode, and a clutch mode can be selected with the switching button only.

Abstract: It is an object of the invention to provide a technique to further increase protection performance for a battery pack of power tool. A representative power tool may include a tool body to which a tool bit is coupled to perform a predetermined operation, a driving motor that is disposed within the tool body, a battery pack that supplies driving current to the driving motor, the battery pack being removably mounted to the tool body and placed on the outside of the tool body in an exposed state, and a protector that is removably mounted to the tool body to protect the battery pack. The protector may include a battery pack protection area that protects the battery pack mounted to the tool body when the protector is mounted to the tool body. The battery pack protection area is dosed on at least part of the outer surface of the battery pack with a clearance and prevents transmission of external force upon the battery pack protection area to the battery pack.