Patent application number | Description | Published |
20090305035 | PROCESS FOR PRODUCING SANDWICH STRUCTURE AND ADHESIVE FILM USED THEREFOR - A process for producing a sandwich structure, includes laminating a reinforced fiber material which is substantially free from a matrix resin; a glycol modified copolymerized polyester resin film; a thermosetting resin composition film which is hardened at room temperature; a core material selected from an open cell foam and a honeycomb; a thermosetting resin composition film which is hardened at room temperature; a glycol modified copolymerized polyester resin film; and a reinforced fiber material which is substantially free from a matrix resin, in this order in a molding tool to form a sandwich, hardening the thermosetting resin composition film which is hardened at room temperature under a condition that the molding tool is closed, infusing a matrix resin into the molding tool, and adjusting a temperature in the molding tool at room temperature or a hardening temperature of the matrix resin to harden the matrix resin. | 12-10-2009 |
20120071585 | EPOXY RESIN COMPOSITION, PREPREG AND FIBER-REINFORCED COMPOSITE MATERIAL - Provided is an epoxy resin composition having superior flame resistance without containing a halogen-based flame retardant, red phosphorous or phosphate ester, and a prepreg and a fiber-reinforced composite material that use the epoxy resin composition. The epoxy resin composition has as essential components thereof (A) a phosphorous-containing epoxy resin composed of a compound (a) represented by the following formula (a), (C) a novolak-type epoxy resin, and (D) an epoxy resin curing agent. A prepreg containing the epoxy resin composition and a fiber-reinforced composite material obtained by curing the prepreg are also provided. | 03-22-2012 |
20120202071 | FIBER-REINFORCED COMPOSITE MATERIAL - A prepreg comprising an epoxy resin (A), a boron chloride-amine complex (B) and a fiber base material (C) is used. Preferably, the molar ratio of boron in the boron chloride-amine complex (B) is 4-7 mol % with respect to the number of moles of epoxy groups in the epoxy resin (A), and the epoxy resin (A) includes a bifunctional epoxy resin with an oxazolidone ring structure, a bisphenol-type epoxy resin and a phenol-novolac-type epoxy resin. | 08-09-2012 |
20120231687 | METHOD FOR PRODUCING FIBER-REINFORCED COMPOSITE MATERIAL, AND HEAT-RESISTANT MOLD MATERIAL AND HEAT-RESISTANT STRUCTURAL MATERIAL USING THE FIBER-REINFORCED COMPOSITE MATERIAL - A method for producing a fiber-reinforced composite material having high mechanical properties and high heat resistance, and allowing the use of a gypsum die in primary curing, wherein a fiber-reinforced prepreg, obtained by impregnating reinforcing fibers with an epoxy resin composition comprising a triphenylmethane-type epoxy resin, N,N,N′,N′-tetraglycidyldiaminodiphenylmethane (B) and diaminodiphenylsulfone (C), is subjected to primary curing at 110-130° C., and then to secondary curing at a temperature which is at least as high as the primary curing temperature. | 09-13-2012 |
20120283352 | CHAIN CURING RESIN COMPOSITION AND FIBER-REINFORCED COMPOSITE MATERIAL - Provided is an RTM moldable chain curing resin composition which can be molded with less energy in a short time, and which makes it possible to obtain a cured product that is superior in mechanical strength. A chain curing resin composition of the present invention includes an alicyclic epoxy compound (A) having two cyclohexene oxides in a molecule and a specific modified bisphenol A-type epoxy resin (B), and the content of the alicyclic epoxy compound (A) is 25 to 90% by mass, when the total of the component (A) and the component (B) is taken as 100% by mass. | 11-08-2012 |
20130338266 | EPOXY RESIN COMPOSITION, PREPREG, AND FIBER-REINFORCED COMPOSITE MATERIAL - The present invention relates to an epoxy resin composition which comprises a phosphorus-containing modified epoxy resin (A) consisting of a compound (a) represented by Formula (a); a novolak epoxy resin (B); a hardener (C) for epoxy resins; and a metal hydroxide (D), wherein the content in mass % of the phosphorus-containing modified epoxy resin (A), C | 12-19-2013 |
20140235757 | EPOXY RESIN COMPOSITION, PREPREG, FIBER-REINFORCED COMPOSITE MATERIAL, AND METHOD FOR PRODUCING SAME - 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), R | 08-21-2014 |
20140273693 | PREPREG, FIBER-REINFORCED COMPOSITE MATERIAL, METHOD FOR PRODUCING SAME, AND EPOXY RESIN COMPOSITION - 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. | 09-18-2014 |
Patent application number | Description | Published |
20130122768 | Resin Composition, Prepreg Using The Same, and Fiber-Reinforced Composite Material - A resin composition that has good heat resistance and handleability and that can produce a prepreg which has a good balance between tackyness and drapability and which causes little resin flow during prepreg molding, a prepreg that is manufactured using the resin composition, and a fiber-reinforced composite are provided. A resin composition that contains a maleimide compound, diallyl bisphenol A, and a diallyl isophthalate polymer, a prepreg in which reinforcing fibers are impregnated with the resin composition, and a fiber-reinforced composite material that is obtained by molding the prepreg are provided. | 05-16-2013 |
20130295811 | CARBON-FIBER-PRECURSOR FIBER BUNDLE, CARBON FIBER BUNDLE, AND USES THEREOF - Provided are: a carbon fiber bundle which has a large value of single-fiber fineness and excellent productivity and which, despite this, contains few interlaced single fibers therein and has excellent spreadability; and precursor fibers which are suitable for use in producing the carbon fiber bundle. The precursor fibers are a carbon-fiber-precursor acrylic fiber bundle which comprises a polyacrylonitrile copolymer comprising 95-99 mol % acrylonitrile units and 1-5 mol % hydroxyalkyl (meth)acrylate units and which has a single-fiber fineness of 1.5-5.0 dtex. In the acrylic fiber bundle, the cross-section of each single fiber which is perpendicular to the fiber axis has a shape that has a roundness of 0.9 or less. The roundness is a value determined using equation (1) where S and L are the cross-sectional area and the circumferential length, respectively, of a single fiber which are obtained by examining, with an SEM, the cross-section of the single fiber which is perpendicular to the fiber axis and analyzing the obtained image. | 11-07-2013 |
20130327479 | MATRIX RESIN COMPOSITION, PREPREG AND METHOD FOR PRODUCING THE SAME, AND FIBER-REINFORCED COMPOSITE MATERIAL - The present invention relates to a method for producing a prepreg which contains reinforcing fibers and a matrix resin composition with the weight per square meter of the reinforcing fibers being 250-2,000 g/m | 12-12-2013 |