Abstract: A prepreg 10 comprises: a reinforcing fiber layer 3 including reinforcing fibers 1 and a resin composition 2 with which the space between fibers of the reinforcing fibers is impregnated and which contains (A) a benzoxazine resin, (B) an epoxy resin, and (C) a curing agent represented by the following formula (C-1); and surface layers 6a and 6b provided on the surfaces of the reinforcing fiber layer 3 and containing (A) a benzoxazine resin, (B) an epoxy resin, (C) a curing agent represented by the following formula (C-1), and (D) polyamide resin particles 4 having an average particle size of 5 to 50 wherein the polyamide resin particles 4 include a polyamide 12 resin particle or a polyamide 1010 resin particle.

Abstract: A prepreg 10 comprises: a reinforcing fiber layer 3 including reinforcing fibers 1 and a resin composition 2 with which the space between fibers of the reinforcing fibers is impregnated and which contains (A) a benzoxazine resin, (B) an epoxy resin, and (C) a curing agent having 2 or more phenolic hydroxy groups in a molecule; and surface layers 6a and 6b provided on the surfaces of the reinforcing fiber layer 3 and containing (A) a benzoxazine resin, (B) an epoxy resin, (C) a curing agent having 2 or more phenolic hydroxy groups in a molecule, and (D) polyamide resin particles 4 having an average particle size of 5 to 50 ?m, wherein the polyamide resin particles 4 include the polyamide 1010 resin particle.

Abstract: A prepreg 10 comprises: a reinforcing fiber layer 3 including reinforcing fibers 1 and a resin composition 2 with which the space between fibers thereof is impregnated and which contains (A) a benzoxazine resin, (B) an epoxy resin, and (C) a curing agent having 2 or more phenolic hydroxy groups; and surface layers 6a and 6b provided on the surfaces of the reinforcing fiber layer 3 and containing (A) a benzoxazine resin, (B) an epoxy resin, (C) a curing agent having 2 or more phenolic hydroxy groups, and (D) polyamide resin particles 4 having an average particle size of 5 to 50 wherein the polyamide resin particles 4 include a particle made of a copolymer in which caprolactam and laurolactam are copolymerized at a molar ratio of 9:1 to 7:3 and having a melting point of 180° C. or more.

Abstract: A fiber-reinforced composite material is provided which is capable of achieving CAI, ILSS, and interlaminar fracture toughness concurrently at high levels, in particular, capable of achieving high CAI. The composite material is composed of a laminated body including a plurality of reinforcing-fiber-containing layers and a resin layer in each interlaminar region between adjacent reinforcing-fiber-containing layers, wherein the resin layer is a layer wherein a cured product of a compound having in its molecule a benzoxazine ring of formula (1) and epoxy resin is impregnated with at least polyamide 12 powder: (R1: C1-C12 chain alkyl group or the like; H is bonded to at least one of the carbon atoms of the aromatic ring at ortho- or para-position with respect to C to which the oxygen atom is bonded).

Abstract: A curable resin composition which comprising (A), (B) and (C) as follows: (A) 100 parts by mass of polyfunctional epoxy component which contains (A1) a trifunctional epoxy compound having three glycidyl groups in a molecule and (A2) a tetrafunctional epoxy compound having four glycidyl groups in a molecule, wherein (A1):(A2) is 10:90 to 90:10 in terms of mass; (B) 25 to 200 parts by mass of a cyanic acid ester compound having two or more of cyanato groups; and (C) 0.5 to 20 parts by mass of an imidazole compound as a curing agent.

Abstract: Fiber-reinforced composite material is provided which is capable of achieving high levels of CAI, ILSS, and interlaminar fracture toughness concurrently, in particular, capable of achieving high ILSS at high CAI, temperature, and humidity. The fiber-reinforced composite material is composed of a laminated body including a plurality of reinforcing-fiber-containing layers and a resin layer in each interlaminar region between adjacent reinforcing-fiber-containing layers, wherein the resin layer is a layer wherein at least polyethersulphone particles are impregnated with a cured product of epoxy resin and a compound having in its molecule a benzoxazine ring represented by formula (1): wherein R1 has the same meaning as defined in the specification. The composite material is useful in automobile-, railroad-vehicle-, aircraft-, and ship-related applications, building components, such as windmills, and other general industry-related applications.

Abstract: A fiber-reinforced composite material is provided which is capable of achieving CAI, ILSS, and interlaminar fracture toughness concurrently at high levels, in particular, capable of achieving high CAI. The composite material is composed of a laminated body including a plurality of reinforcing-fiber-containing layers and a resin layer in each interlaminar region between adjacent reinforcing-fiber-containing layers, wherein the resin layer is a layer wherein a cured product of a compound having in its molecule a benzoxazine ring of formula (1) and epoxy resin is impregnated with at least polyamide 12 powder: (R1: C1-C12 chain alkyl group or the like; H is bonded to at least one of the carbon atoms of the aromatic ring at ortho- or para-position with respect to C to which the oxygen atom is bonded).

Abstract: A fiber-reinforced composite material can achieve dynamical properties at high levels, and can simultaneously improve Mode I interlaminar fracture toughness GIC and Mode II interlaminar fracture toughness GIIC. The fiber-reinforced composite material has a plurality of reinforcing-fiber-containing layers and an interposing resin layer between adjacent reinforcing-fiber-containing layers. The resin layer is composed of a cured product of a resin composition containing a compound having a benzoxazine ring of formula (1), epoxy resin, a curing agent, a toughness improver, and polyamide 12 powder. The composite material has a GIC of not lower than 300 J/m2, and a GIIC of not lower than 1000 J/m2: (R1: C1-C12 chain alkyl group; H is bonded to at least one of the carbon atoms of the aromatic ring at ortho- or para-position with respect to C to which the oxygen atom is bonded).

Abstract: The purpose of the present invention is to inhibit a decrease in strength attribute to the interface between a simple-shape portion and a complicated-shape portion. This fiber-reinforced resin composite material comprises: a simple-shape portion formed from at least one sheet-shaped prepreg material obtained by impregnating reinforcing fibers with a resin; and a complicated-shape portion obtained by impregnating reinforcing fibers with a resin, the complicated-shape portion having been integrated with the simple-shape portion. The resin used for the preprg material comprised the same components as the resin used for the complicated-shape portion.

Abstract: Provided are a fiber-reinforced composite material capable of achieving excellent CAI, ILSS, and bending fracture toughness concurrently at high levels, and maintaining a high glass transition temperature of the resin material therein, and prepreg and a benzoxazine resin composition therefor. The composition contains, at a particular ratio, (A) a compound having in its molecule a benzoxazine ring represented by formula (1), (B) an epoxy resin, (C) a curing agent, (D) a toughness improver, and (E) polyamide 12 particles of a particular particle size, and component (D) is dissolved: (R1: C1-C12 chain alkyl group or the like, and H is bonded to at least one of Cs of the aromatic ring at o- or p-position with respect to the carbon atom to which the oxygen atom is bonded).

Abstract: The epoxy resin composition of the present invention is characterized in that a polyamide compound having a moiety derived from a hydroxyl substituted aromatic amine having a phenolic hydroxyl group adjacent to an amino group is used as an epoxy resin hardener.

Abstract: A molded carbon-fiber-reinforced plastic (molded CFRP) includes a plurality of carbon fiber layers having carbon fibers, a resin body in which the carbon fiber layers are buried, and pins which are inserted and fixed in a plurality of holes formed in the resin body so as to extend through the carbon fiber layers. In the molded CFRP, the pins can be inserted and fixed in the plurality of holes formed in the resin body so as to extend through the carbon fiber layers, to thereby improve interlaminar toughness of the molded CFRP.

Abstract: A composite material obtained by laminating (A) a layer formed from an epoxy resin curing composition and (B) a layer of a polyimide to each other. The composite material is preferably obtained by applying the epoxy resin curing composition to at least one side of a polyimide film or sheet. The epoxy resin curing composition includes a curing agent containing a polyamide compound having a repeat unit comprising a phenolic hydroxyl group containing structure represented by the following formula (I) or (II): In formula (I), ring A and R each represent a phenylene group or a naphthylene group, each of which may be substituted with a halogen atom, a hydroxyl group or an alkyl group having 1 to 4 carbon atoms. In formula (II), ring B is an arylene group having 6 to 18 carbon atoms or an alkylidenediarylene group having 13 to 25 carbon atoms, each of which may be substituted with a halogen atom, a hydroxyl group or an alkyl group having 1 to 4 carbon atoms.

Abstract: An epoxy resin curable composition for a prepreg, comprising the following components (A) to (E): (A) a polyamide compound having a structure derived from an aromatic diamine including a phenolic hydroxyl group, the aromatic diamine having the phenolic hydroxyl group in a position adjacent to an amino group; (B) an epoxy resin; (C) an epoxy resin curing agent; (D) a filler; and (E) a solvent.

Abstract: The epoxy resin composition of the present invention is characterized in that a polyamide compound having a moiety derived from a hydroxyl substituted aromatic amine having a phenolic hydroxyl group adjacent to an amino group is used as an epoxy resin hardener.

Abstract: A composite material obtained by laminating (A) a layer formed of an epoxy resin curing composition including a polyamide compound having a structure containing a phenolic hydroxyl group represented by the following formula (I) or (II) in its repeating unit and (B) a layer of a polyimide to each other. The composite material is preferably obtained by applying the epoxy resin curing composition to at least one side of a polyimide film or sheet. In formula (I), ring A and R each represent an arylene group having 6 to 18 carbon atoms, an alkylidenediarylene group having 13 to 25 carbon atoms, etc. In formula (II), ring B is an arylene group having 6 to 18 carbon atoms or an alkylidenediaryl group having 13 to 25 carbon atoms.

Abstract: An epoxy resin curable composition for a prepreg, comprising the following components (A) to (E): (A): a polyamide compound having a structure derived from an aromatic diamine including a phenolic hydroxyl group, the aromatic diamine having the phenolic hydroxyl group in a position adjacent to an amino group; (B): an epoxy resin; (C): an epoxy resin curing agent; (D): a filler; and (E): a solvent.

Abstract: An epoxy resin composition which comprises 100 parts by weight of an epoxy resin and 1 to 800 parts by weight of an aluminum borate whisker having an average fiber diameter of 0.25 ?m or less. The epoxy resin composition contains a large amount of the aluminum borate whisker being dispersed uniformly therein, is excellent in mechanical strength, and is suppressed with respect to the anisotropy of a mechanical property due to the direction of application.

Abstract: An epoxy resin composition which comprises 100 parts by weight of an epoxy resin and 1 to 800 parts by weight of an aluminum borate whisker having an average fiber diameter of 0.25 ?m or less. The epoxy resin composition contains a large amount of the aluminum borate whisker being dispersed uniformly therein, is excellent in mechanical strength, and is suppressed with respect to the anisotropy of a mechanical property due to the direction of application.

Abstract: A multilayer LC composite component includes a coil unit including a stack of coil conductors, two adjacent coil conductors being separated by an insulating layer (dielectric layer) and being electrically connected to each other and a capacitor unit including a ground-side capacitor electrode and a signal-side capacitor electrode which oppose each other with an insulating layer disposed therebetween, the ground-side capacitor electrode having an electrode-free area at a central region thereof and the signal-side capacitor electrode being electrically connected to the coil unit via the electrode-free area. The ground-side capacitor electrode extends to at least two opposing sides of the insulating layer (dielectric layer) and has a cut portion (cross-shaped cut portion) which extends continuously from the electrode-free area.