Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
  • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
  • C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L81/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen or carbon only; Compositions of polysulfones; Compositions of derivatives of such polymers
  • C08L81/06—Polysulfones; Polyethersulfones

Definitions

• the present invention relates to an epoxy resin composition, a prepreg using the epoxy resin composition, and a fiber-reinforced composite material.
• Fiber-reinforced composite materials that use carbon fiber or aramid fiber as reinforcing fibers utilize their high specific strength and specific elastic modulus to make structural materials such as aircraft and automobiles, tennis rackets, golf shafts, fishing rods, bicycles, etc. It is widely used for sports such as housings and general industrial applications.
• a method for producing a fiber-reinforced composite material a method of laminating a plurality of prepregs, which are sheet-shaped molding materials in which reinforcing fibers are impregnated with an uncured resin composition, and then heat-curing them, or a method of reinforced placed in a mold.
• a resin transfer molding method or the like in which a liquid resin is poured into fibers and cured by heating is used.
• the method using a prepreg has an advantage that a high-performance fiber-reinforced composite material can be easily obtained because the orientation of the reinforcing fibers can be strictly controlled and the degree of freedom in designing the laminated structure is high.
• a thermosetting resin is mainly used from the viewpoint of heat resistance and productivity, and among them, an epoxy resin is preferably used from the viewpoint of mechanical properties such as adhesiveness to reinforcing fibers. .. Further, dicyandiamide is often used as a curing agent because the obtained cured product has excellent mechanical properties and heat resistance.
• a prepreg used for a cylindrical molded body such as a golf shaft or a fishing rod is required to have a high tack property on the surface in order to prevent the prepreg from being unwound when it is shaped into a cylindrical shape.
• the tackiness of such a prepreg is affected by the viscosity characteristics of the resin composition used in combination with the reinforcing fiber, and in order to exhibit good tackiness, the resin composition is prepared by a method such as blending a thermoplastic resin with an epoxy resin. It is necessary to adjust the viscosity of the above to a certain value or more.
• Patent Documents 1 and 2 disclose a method for blending an isocyanuric acid type epoxy resin.
• the strength of the epoxy resin cured product may be impaired by blending the thermoplastic resin. Further, also in the resin composition used in Patent Document 2, the strength of the epoxy resin cured product may be impaired by blending the thermoplastic resin. As described above, conventionally, it has been extremely difficult to achieve both the excellent tackiness of the prepreg and the elastic modulus and strength of the resin. Further, in Patent Document 1 and Patent Document 2, the appearance quality of the obtained cured resin product and fiber-reinforced composite material was not considered.
• An object of the present invention is to provide an epoxy resin composition having an excellent elastic modulus and strength of a cured product, a prepreg having a high tack property using the epoxy resin composition, and a fiber-reinforced composite material having an excellent appearance quality. And.
• the present invention employs the following means to solve such a problem. That is, the present invention is an epoxy resin composition containing the following constituent elements [A] to [C], and isocyanuric acid type epoxy resin as the constituent element [A-1] out of 100% by mass of the constituent elements [A]. Is an epoxy resin composition containing 20% by mass or more and 40% by mass or less.
• the present invention is a prepreg composed of the epoxy resin composition of the present invention and reinforcing fibers.
• the present invention is a fiber-reinforced composite material composed of a cured product of the epoxy resin composition of the present invention and reinforcing fibers.
• an epoxy resin composition having an excellent elastic modulus and strength of a cured product, a prepreg having a high tack property using the epoxy resin composition, and a fiber-reinforced composite material having an excellent appearance quality can be obtained.
• the resin composition of the present invention contains the constituent elements [A] to [C] as essential components.
• the "component” means a compound contained in the composition.
• the component [A] in the present invention is an epoxy resin.
• Thermosetting can be obtained with the epoxy resin.
• the epoxy resin of the component [A] may have one epoxy group in one molecule, but when one molecule contains two or more epoxy groups, the resin composition is heated. It is preferable because the glass transition temperature of the cured product obtained by curing becomes high and the heat resistance becomes high. These epoxy resins may be used alone or in combination as appropriate.
• Examples of the epoxy resin of the component [A] include diaminodiphenylmethane type, diaminodiphenylsulfone type, aminophenol type, bisphenol type, metaxylene diamine type, 1,3-bisaminomethylcyclohexane type, isocyanurate type, and hydantin type. , Phenol novolac type, orthocresol novolac type, trishydroxyphenylmethane type, tetraphenylol ethane type and other epoxy resins.
• the component [A] contains an isocyanuric acid type epoxy resin as the component [A-1].
• the isocyanuric acid type epoxy resin has an isocyanuric acid skeleton in the molecule, and this resin can improve the elastic modulus of the cured product.
• the content of the component [A-1] it is important that the component [A-1] is contained in an amount of 20% by mass or more and 40% by mass or less among 100% by mass of the component [A].
• an epoxy resin cured product having an excellent elastic modulus can be obtained.
• the component [A-1] is precipitated and becomes non-uniform in the epoxy resin composition, or the component [A-1] is cured after curing. It is possible to prevent the precipitation of A-1] from impairing the strength, and in addition, the appearance quality of the obtained fiber-reinforced composite material is also excellent.
• the blending amount of the component [A-1] is 30% by mass or more and 35% by mass or less, the balance between the elastic modulus and the strength of the obtained cured epoxy resin is particularly excellent.
• the component [A-1] is preferably a trifunctional isocyanuric acid type epoxy resin.
• the component [A-1] is trifunctional with three epoxy groups in the molecule, an epoxy resin cured product having a particularly excellent balance between elastic modulus and strength can be obtained.
• Examples of commercially available isocyanuric acid type epoxy resins include “TEPIC (registered trademark)”-S (trifunctional), “TEPIC (registered trademark)”-G (trifunctional), and “TEPIC (registered trademark)”-L ( (Trifunctional), “TEPIC (registered trademark)”-HP (trifunctional), “TEPIC (registered trademark)”-VL (trifunctional), “TEPIC (registered trademark)”-UC (six-functional), “TEPIC (registered)” Trademark) "-PAS B22 (2.2 functionality),” TEPIC (registered trademark) "-PAS B26L (2.6 functionality), (all manufactured by Nissan Chemical Industries, Ltd.),” Araldite (registered trademark) "PT9810 (Trifunctional) (manufactured by Huntsman Advanced Materials) or the like can be used. These may be used alone or in combination as appropriate.
• the component [A] preferably contains a trifunctional or higher functional glycidylamine type epoxy resin as the component [A-2] in an amount of 20% by mass or more and 60% by mass or less based on 100% by mass of the component [A].
• a trifunctional or higher functional glycidylamine type epoxy resin as the component [A-2] in an amount of 20% by mass or more and 60% by mass or less based on 100% by mass of the component [A].
• trifunctional or higher functional glycidylamine type epoxy resin examples include diaminodiphenylmethane type, diaminodiphenylsulfone type, and aminophenol type epoxy resin. These may be used alone or in combination as appropriate.
• diaminodiphenylmethane type epoxy resin examples include ELM434 (manufactured by Sumitomo Chemical Co., Ltd.), "Araldite (registered trademark)” MY720 (manufactured by Huntsman Advanced Materials Co., Ltd.), and "Araldite (registered trademark)” MY721.
• Examples of commercially available diaminodiphenyl sulfone type epoxy resins include TG3DAS (manufactured by Mitsui Kagaku Fine Co., Ltd.).
• aminophenol type epoxy resins include ELM120 (manufactured by Sumitomo Chemical Co., Ltd.), ELM100 (manufactured by Sumitomo Chemical Co., Ltd.), "jER (registered trademark)” 630 (manufactured by Mitsubishi Chemical Co., Ltd.), and "Araldite”.
• the component [A] may contain, as the component [A-3], a bisphenol type epoxy resin in the form of a solid at 25 ° C., which is 10% by mass or more and 40% by mass or less of 100% by mass of the component [A]. preferable.
• a bisphenol type epoxy resin in the form of a solid at 25 ° C., which is 10% by mass or more and 40% by mass or less of 100% by mass of the component [A].
• the component [A-3] in an amount of 10% by mass or more, more preferably 30% by mass or more, the resin viscosity of the resin composition at 25 ° C. becomes high, and the tack of the obtained prepreg is excellent.
• the elastic modulus of the obtained epoxy resin cured product is excellent, and the appearance quality of the obtained fiber-reinforced composite material is also excellent.
• the component [A] preferably contains a component in the form of a solid at 25 ° C. in an amount of 60% by mass or more out of 100% by mass of the component [A].
• a component in the form of a solid at 25 ° C. By containing 60% by mass or more of a component in the form of a solid at 25 ° C., the resin viscosity of the epoxy resin composition at 25 ° C. becomes appropriate, and the tack of the obtained prepreg is excellent.
• the epoxy resin composition of the present invention contains dicyandiamide as a component [B].
• Dicyandiamide is excellent in giving high mechanical properties and heat resistance to the cured epoxy resin, and functions as a curing agent that forms the main skeleton of the cured epoxy resin.
• dicyandiamide is also excellent in storage stability of the epoxy resin composition.
• Examples of commercially available dicyandiamide products include DICY7 (manufactured by Mitsubishi Chemical Corporation) and DICY15 (manufactured by Mitsubishi Chemical Corporation).
• the content of dicyandiamide in the epoxy resin composition of the present invention shall be such that the number of active hydrogen groups of dicyandiamide is 0.2 equivalent or more and 1.2 equivalent or less with respect to the total number of epoxy groups of the component [A]. Is preferable.
• the amount of dicyandiamide in terms of active hydrogen group relative to epoxy group is 0.2 equivalent or more and 1.2 equivalent or less, more preferably 0.3 equivalent or more and 1.0 equivalent or less, and further preferably 0.4 equivalent or more and 0.7 equivalent or less. Therefore, an epoxy resin cured product having a particularly excellent balance between heat resistance and mechanical properties can be obtained.
• the epoxy resin composition of the present invention contains polysulfone having a weight average molecular weight of 15,000 or more and 25,000 or less as a component [C].
• the component [C] is necessary to enhance the tackiness of the prepreg without impairing the elastic modulus and strength of the cured epoxy resin product and the appearance quality of the cured product.
• the component [A-1] which is an essential component of the present invention, has a highly polar isocyanuric acid skeleton, so that it is a thermoplastic resin as compared with other epoxy resins such as glycidylamine type. It tends to have low compatibility with. Therefore, in order to make the viscosity of the epoxy resin composition appropriate, when polyvinyl formal used as a viscosity modifier, polyether sulfone having a weight average molecular weight of more than 25,000, or the like is blended, the epoxy resin is mixed with the epoxy resin after curing. In some cases, the thermoplastic resin and the thermoplastic resin were roughly phase-separated, and the resin strength was significantly reduced.
• thermoplastic resin When polysulfone having a weight average molecular weight of 25,000 or less is used as the thermoplastic resin, the inventors have excellent compatibility between the thermoplastic resin and the epoxy resin containing the component [A-1], and the epoxy resin composition can be obtained. A uniform phase can be formed without phase separation, or a fine phase-separated structure containing each of an epoxy resin and a thermoplastic resin as main components can be formed, and the elasticity and strength of the cured epoxy resin are not impaired. I found that. Further, when the weight average molecular weight of polysulfone is 25,000 or less, it is possible to prevent the change in viscosity that occurs when dissolved in the epoxy resin from becoming too large, and to prevent the resin from being deteriorated when the prepreg is produced. ..
• the obtained fiber-reinforced composite material has an excellent appearance quality. Further, by setting the weight average molecular weight of polysulfone to 15,000 or more, the viscosity of the epoxy resin can be adjusted even with a small amount, and the tackiness of the prepreg can be improved without impairing the elastic modulus and strength of the cured epoxy resin. Can be enhanced. Further, when the weight average molecular weight of the component [C] is 15,000 or more and 22,000 or less, the balance between the elastic modulus and strength of the cured product, the tack of the prepreg, and the appearance quality of the fiber-reinforced composite material is improved, which is preferable.
• the content of the component [C] in the epoxy resin composition of the present invention is preferably 2 parts by mass or more and 15 parts by mass or less of the component [C] with respect to 100 parts by mass of the component [A]. It is more preferable to contain 5 parts by mass or more and 12 parts by mass or less, and further preferably 8 parts by mass or more and 12 parts by mass or less.
• the epoxy resin composition of the present invention may contain a thermoplastic resin other than the component [C] as long as the physical properties are not impaired.
• a curing accelerator may be added from the viewpoint of controlling the curing rate.
• the curing accelerator include urea compounds and imidazole compounds. From the viewpoint of storage stability of the epoxy resin composition, a urea compound can be particularly preferably used.
• urea compound examples include aromatics such as 3- (3,4-dichlorophenyl) -1,1-dimethylurea, 3- (4-chlorophenyl) -1,1-dimethylurea, phenyldimethylurea, and toluenebisdimethylurea.
• aromatics such as 3- (3,4-dichlorophenyl) -1,1-dimethylurea, 3- (4-chlorophenyl) -1,1-dimethylurea, phenyldimethylurea, and toluenebisdimethylurea.
• Urea compounds can be mentioned, and among them, toluenebisdimethylurea is preferable because it is excellent in quick-curing property and strength of the obtained epoxy resin composition.
• the epoxy resin composition of the present invention after holding for 60 minutes at 90 ° C., the plate-like cured product with a thickness of 2mm which was cured for 120 minutes at 135 ° C., in accordance with the transmission method L * a * b * color system
• the brightness index L * is preferably 15 or more, more preferably 20 or more, and even more preferably 30 or more.
• the coloring of the surface of the obtained fiber-reinforced composite material and the coloring of the resin pool portion existing in the stitch of the fiber woven base material become less noticeable, and the appearance quality is excellent. It is a fiber reinforced composite material.
• the lightness index L * of the cured resin can be controlled by changing the type and compounding ratio of each component contained in the resin composition, and the weight average molecular weight of the component [C].
• L * As a method for increasing the value of L *, the amount of the component [A-1] is reduced, the amount of the component [A-3] is reduced, and the amount of the component [C] is increased. Examples thereof include a method of reducing the weight average molecular weight of the component [C] and reducing the weight average molecular weight of the component [C].
• the epoxy resin composition of the present invention has excellent elastic modulus, strength, and elongation, and is suitably used as a matrix resin for fiber-reinforced composite materials. That is, the fiber-reinforced composite material of the present invention comprises a cured product of the epoxy resin composition of the present invention and reinforcing fibers.
• Methods for obtaining a fiber-reinforced composite material include a method of impregnating a reinforcing fiber with a resin composition in a molding process such as a hand lay-up method, an RTM method, a filament winding method, and a drawing molding method, or a method of preliminarily converting a resin composition into a reinforcing fiber.
• a method of molding the impregnated prepreg by an autoclave method or a press molding method.
• the prepreg of the present invention comprises the epoxy resin composition of the present invention and reinforcing fibers.
• the reinforcing fiber used for the prepreg and the fiber-reinforced composite material of the present invention carbon fiber, graphite fiber, aramid fiber, glass fiber and the like can be preferably mentioned, but carbon fiber is particularly preferable.
• the form and arrangement of the reinforcing fibers are not limited, and for example, fibrous structures such as long fibers aligned in one direction, a single tow, a woven fabric, a knit, and a braid are used.
• the reinforcing fibers two or more types of carbon fibers, glass fibers, aramid fibers, boron fibers, PBO fibers, high-strength polyethylene fibers, alumina fibers, silicon carbide fibers and the like may be used in combination.
• carbon fibers include acrylic, pitch and rayon carbon fibers, and acrylic carbon fibers having particularly high tensile strength are preferably used.
• the form of the carbon fiber twisted yarn, untwisted yarn, untwisted yarn and the like can be used, but in the case of twisted yarn, the orientation of the filaments constituting the carbon fiber is not parallel, so that the obtained carbon fiber reinforced composite material is obtained. Since it causes deterioration of the mechanical properties of the carbon fiber reinforced composite material, untwisted or untwisted yarn having a good balance between formability and strength characteristics of the carbon fiber reinforced composite material is preferably used.
• the carbon fiber preferably has a tensile elastic modulus of 200 GPa or more and 440 GPa or less.
• the tensile elastic modulus of the carbon fiber is affected by the crystallinity of the graphite structure constituting the carbon fiber, and the higher the crystallinity, the higher the elastic modulus. Within this range, the rigidity and strength of the carbon fiber reinforced composite material are all balanced at a high level, which is preferable.
• a more preferable elastic modulus is 230 GPa or more and 400 GPa or less, and more preferably 260 GPa or more and 370 GPa or less.
• the tensile elastic modulus of the carbon fiber is a value measured according to JIS R7608 (2008).
• the prepreg of the present invention can be produced by various known methods.
• a prepreg can be produced by a hot melt method in which the resin composition is reduced in viscosity by heating and impregnated into reinforcing fibers without using an organic solvent.
• a method of directly impregnating the reinforcing fibers with a resin composition whose viscosity has been reduced by heating or a method of first producing a release paper sheet with a resin film in which the resin composition is once coated on a release paper or the like. Then, a method can be used in which a resin film is laminated on the reinforcing fiber side from both sides or one side of the reinforcing fiber and the reinforcing fiber is impregnated with the resin composition by heating and pressurizing.
• the content of the reinforcing fibers in the prepreg is preferably 30% by mass or more and 90% by mass or less.
• it is 30% by mass or more, more preferably 35% by mass or more, and further preferably 65% by mass or more, the advantages of the fiber-reinforced composite material having excellent specific strength and specific elastic modulus can be easily obtained.
• it is possible to prevent the amount of heat generated during curing from becoming too high.
• it is 90% by mass or less, more preferably 85% by mass or less, it is possible to suppress the generation of voids in the composite material due to poor impregnation of the resin.
• the tackiness of the prepreg can be maintained.
• the fiber-reinforced composite material of the present invention can be produced, for example, by laminating the above-mentioned prepreg of the present invention in a predetermined form and pressurizing and heating to cure the resin.
• a method of applying heat and pressure a press molding method, an autoclave molding method, a bagging molding method, a lapping tape method, an internal pressure molding method and the like are adopted.
• the fiber reinforced composite material of the present invention can be widely used for aerospace applications, general industrial applications and sports applications. More specifically, in general industrial applications, it is suitably used for structures such as automobiles, ships, and railroad vehicles. In sports applications, it is suitably used for golf shafts, fishing rods, tennis and badminton rackets.
• the unit "parts" of the composition ratio means parts by mass unless otherwise specified.
• the various characteristics (physical properties) were measured in an environment with a temperature of 23 ° C. and a relative humidity of 50% unless otherwise specified.
• the average value of the strength and the elastic modulus when the three-point bending was performed according to JIS K7171 (1994) was defined as the bending strength of the cured resin product and the flexural modulus of the cured resin product, respectively.
• the viscosity of the resin composition was measured using a dynamic viscoelastic device (“ARES” -G2 manufactured by TA Instruments Co., Ltd.). A flat parallel plate having a diameter of 25 mm was used as the upper and lower measuring jigs, the epoxy resin composition was set so that the distance between the upper and lower jigs was 1 mm, and then the measurement was performed in a twist mode (measurement frequency: 0.5 Hz). .. The temperature was raised from 20 ° C. to 30 ° C. at a rate of 1 ° C./min, and the complex viscoelasticity at 25 ° C. was defined as the viscosity of the resin composition at 25 ° C.
• a test piece having a width of 10 mm and a length of 60 mm was cut out from this cured resin product, and the brightness index L * was measured by a transmission method using a multi-light source spectrophotometer MSC-P (manufactured by Suga Test Instruments Co., Ltd.).
• Component [A-2] Trifunctional or higher functional glycidylamine type epoxy resin ⁇ "Araldite (registered trademark)" MY0500 (aminophenol type epoxy resin, epoxy equivalent: 118 g / eq, liquid at 25 ° C., Huntsman. Made by Advanced Materials Co., Ltd.
• Component [A-3] Bisphenol type epoxy resin in solid form at 25 ° C. ⁇ "jER (registered trademark)" 4004P (bisphenol F type epoxy resin, epoxy equivalent: 880 g / eq, solid at 25 ° C. , Made by Mitsubishi Chemical Co., Ltd.).
• Epoxy resin "jER (registered trademark)" 828 bisphenol F type epoxy resin, epoxy equivalent: 189 g / eq, liquid at 25 ° C., manufactured by Mitsubishi Chemical Corporation
• Component [C] Polysulfone having a weight average molecular weight of 15,000 or more and 25,000 or less ⁇ "Virantage (registered trademark)" VW-10700RFP (polyethersulfone, weight average molecular weight: 21000, manufactured by Solvay Advanced Polymers Co., Ltd.) -"Sumika Excel (registered trademark)” PES2603P (polyether sulfone, weight average molecular weight: 16000, manufactured by Sumitomo Chemical Co., Ltd.).
• Curing accelerator ⁇ "Omicure (registered trademark)" U-24M (2,4-toluenebis (dimethylurea), manufactured by CVC Thermoset Specialties) -DCMU99 (3- (3,4-dichlorophenyl) -1,1-dimethylurea, manufactured by Hodogaya Chemical Industry Co., Ltd.).
• Carbon fiber- "Treca (registered trademark)" T1100G-24K (24,000 fibers, tensile elastic modulus: 324 GPa, density 1.8 g / cm 3 , manufactured by Toray Industries, Inc.).
• the elastic modulus was 4.7 GPa and the strength was 190 MPa. Excellent elastic modulus and strength were obtained as compared with Comparative Examples 2, 3 and 4 described later (component [C] not blended).
• the resin viscosity was 1.8 ⁇ 10 5 Pa ⁇ s, and a viscosity suitable for prepreg applications.
• the lightness index L * was 23, which was excellent in appearance quality.
• the resin composition obtained above was applied onto a paper pattern using a knife coater to prepare two resin films having a resin basis weight of 21 g / m 2. Next, two obtained resin films were laminated on carbon fibers arranged in one direction so as to form a sheet having a fiber texture of 125 g / m 2, and the temperature was 110 ° C. and the maximum pressure was 1 MPa.
• the epoxy resin composition was impregnated with heat and pressure under the above conditions to obtain a prepreg.
• the tack evaluation of the produced prepreg was Judgment A, and the handleability of the prepreg was extremely good.
• Examples 2 to 13 A resin composition and a prepreg were obtained in the same manner as in Example 1 except that they were blended according to the blending ratios in Tables 1 and 2.
• Comparative Example 1 the component corresponding to the component [C] was not blended. Comparing Comparative Example 1 and Example 1, it can be seen that by blending the component [C], it is possible to suppress the resin viscosity from becoming too low, and the tack of the prepreg becomes good.
• Comparative Example 3 "Sumika Excel (registered trademark)" PES5003P was blended instead of the component [C]. "Sumika Excel®” PES5003P does not meet the requirement that the weight average molecular weight be 15,000 or more and 25,000 or less. Comparing Example 1 and Comparative Example 3, it can be seen that the strength of the cured resin product is dramatically improved when the weight average molecular weight of the component [C] is 15,000 or more and 25,000 or less. Further, in Comparative Example 3, the brightness index L * of the cured resin product was 10, and the coloring was conspicuous.
• Comparative Example 4 "Vinirec (registered trademark)" K was blended instead of the component [C]. Comparing Example 1 and Comparative Example 4, it can be seen that the strength of the cured resin product is dramatically improved because the component [C] is polysulfone having a weight average molecular weight of 15,000 or more and 25,000 or less.
• Comparative Example 5 the compounding ratio of the component [A-1] to the component [A] is 15% by mass. Comparing Example 1 and Comparative Example 5, the elastic modulus and strength of the resin are excellent because the component [A-1] is contained in an amount of 20% by mass or more and 40% by mass or less out of 100% by mass of the component [A]. You can see that.
• Comparative Example 6 the compounding ratio of the component [A-1] to the component [A] is 45% by mass.
• the strength and brightness index L * of the resin are obtained by containing 20% by mass or more and 40% by mass or less of the component [A-1] out of 100% by mass of the component [A]. It turns out that is excellent.

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