Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C33/00—Moulds or cores; Details thereof or accessories therefor
  • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
  • B29C33/40—Plastics, e.g. foam or rubber
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F8/00—Chemical modification by after-treatment
  • C08F8/12—Hydrolysis
• • 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
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
  • C08K3/013—Fillers, pigments or reinforcing additives
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/38—Boron-containing compounds
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
  • C08L29/02—Homopolymers or copolymers of unsaturated alcohols
  • C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids

Definitions

• the present invention relates to a resin composition for cores and cores.
• Patent Document 1 discloses a core resin containing a polyvinyl alcohol resin and an easy-release agent.
• the present invention aims to provide a core resin composition that exhibits high heat resistance and can be used to produce cores that do not deform even under the molding conditions of super engineering plastics. It also aims to provide a core made using this core resin composition.
• the present disclosure (4) is a core resin composition according to the present disclosure (1), (2), or (3), further containing a particulate filler, wherein the total surface area of the particulate filler per unit mass of the core resin composition calculated by the following formula (1) is 10 m 2 /g or more.
• A total surface area of the particle filler per unit mass of the resin composition for the core (m 2 /g)
• B average particle diameter (m) of particle filler
• D Content (mass%) of particle filler in the resin composition for core
• E density of particle filler (g/m 3 )
• the present disclosure (5) is the resin composition for a core according to the present disclosure (4), in which the average particle diameter of the particulate filler is 1 nm or more and 100 nm or less.
• the present disclosure (9) is the core resin composition of the present disclosure (8), in which the glycerin fatty acid ester compound is at least one selected from the group consisting of monoglyceride stearate ester, monoglyceride oleate ester, and diglyceride laurate ester.
• the present disclosure (10) is a core resin composition according to the present disclosure (1), (2), (3), (4), (5), (6), (7), (8) or (9), which is in pellet form.
• the present disclosure (11) is a core made using the core resin composition of the present disclosure (1), (2), (3), (4), (5), (6), (7), (8), (9), or (10). The present invention will be described in detail below.
• MFR melt flow rate
• the resin composition for a core has a melt flow rate (MFR) of 35 g/10 min or less at 230° C. under a load of 10 kg.
• MFR melt flow rate
• the MFR is preferably 25 g/10 min or less, more preferably 20 g/10 min or less, even more preferably 10 g/10 min or less, and particularly preferably 5 g/10 min or less.
• the lower limit of the MFR is not particularly limited, but it is sufficient as long as it can be molded in a molding machine for molding the core, and depends on the capacity of the molding machine.
• the MFR can be measured, for example, by a method in accordance with ASTM D 1238 under conditions such as an initial weight of 7.5 g and a measurement time interval of 0.25 minutes.
• the melt flow rate (MFR) under the above conditions of 230°C and 10 kg load can be adjusted by the composition, such as the weight-average molecular weight and degree of saponification, of the polyvinyl alcohol resin, the blending amount, the type, blending amount, average particle diameter, total surface area, and various shapes of particulate fillers, crosslinkers, plasticizers, and release agents, as described below.
• the total surface area of the particulate filler has a particularly large contribution, and adjusting the total surface area can reduce the MFR through the interaction between the polyvinyl alcohol resin and the particulate filler.
• the core resin composition contains a polyvinyl alcohol resin.
• a polyvinyl alcohol resin By using a polyvinyl alcohol resin, it can be easily removed from the molded body by, for example, immersing it in water.
• the saponification degree of the polyvinyl alcohol resin is preferably 72 mol % or more and 99.8 mol % or less. By setting the content within the above range, the solubility in water can be sufficiently exhibited.
• the saponification degree is more preferably 80 mol% or more, even more preferably 87 mol% or more, even more preferably 92 mol% or more, particularly preferably 95 mol% or more, more preferably 99.5 mol% or less, even more preferably 99 mol% or less.
• the saponification degree can be measured, for example, by a method in accordance with JIS K 6726.
• the saponification degree indicates the proportion of units that are actually converted into vinyl alcohol units among vinyl ester units that can be converted into vinyl alcohol units by saponification.
• the degree of saponification can be controlled, for example, by adjusting the saponification conditions, that is, the hydrolysis conditions.
• the polyvinyl alcohol resin may be an unmodified polyvinyl alcohol resin or a modified polyvinyl alcohol resin.
• the unmodified polyvinyl alcohol resin refers to a polyvinyl alcohol resin containing only vinyl ester units and vinyl alcohol units
• the modified polyvinyl alcohol resin refers to a modified polyvinyl alcohol resin having structural units other than vinyl ester units and vinyl alcohol units.
• the modified polyvinyl alcohol resin include those modified with a hydrophilic modifying group such as a sulfonic acid group, a pyrrolidone ring group, an amino group, a carboxyl group, etc. These hydrophilic groups include not only the functional groups but also their salts such as sodium salts and potassium salts.
• the content of structural units having a modifying group in the above polyvinyl alcohol resin is preferably 1 mol% or more, more preferably 3 mol% or more, and even more preferably 5 mol% or more, and is preferably 20 mol% or less, more preferably 15 mol% or less, and even more preferably 12 mol% or less.
• the weight average molecular weight (Mw) of the polyvinyl alcohol resin is preferably 8,000 or more, more preferably 9,000 or more, even more preferably 10,000 or more, even more preferably 11,000 or more, particularly preferably 15,500 or more, especially more preferably 17,000 or more, and is preferably 200,000 or less, more preferably 150,000 or less, even more preferably 100,000 or less, even more preferably 50,000 or less, especially preferably 40,000 or less.
• the weight average molecular weight (Mw) of the entire polyvinyl alcohol resin is calculated based on the weight average molecular weight of each resin and its weight fraction, and is obtained by summing the values obtained by multiplying the weight average molecular weight of each polyvinyl alcohol resin by its weight fraction.
• the weight average molecular weight (Mw) is preferably 8,000 or more, more preferably 9,000 or more, even more preferably 10,000 or more, even more preferably 11,000 or more, particularly preferably 15,500 or more, particularly preferably 17,000 or more, preferably 200,000 or less, more preferably 150,000 or less, even more preferably 100,000 or less, even more preferably 50,000 or less, particularly preferably 40,000 or less.
• the weight average molecular weight (Mw) is preferably 8,000 or more, more preferably 9,000 or more, even more preferably 10,000 or more, even more preferably 14,000 or more, particularly preferably 15,500 or more, even more particularly preferably 20,000 or more, especially more preferably 22,000 or more, preferably 150,000 or less, more preferably 100,000 or less, even more preferably 50,000 or less, and even more preferably 40,000 or less.
• the ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of the polyvinyl alcohol resin is preferably 1.0 or more, more preferably 1.2 or more, even more preferably 1.4 or more, even more preferably 1.6 or more, and is preferably 5.0 or less, more preferably 4.0 or less, even more preferably 3.5 or less, even more preferably 2.0 or less.
• the weight average molecular weight (Mw) and number average molecular weight (Mn) can be determined, for example, by gel permeation chromatography (GPC), by measuring a polyvinyl ester before saponification by GPC, by measuring a polyvinyl ester obtained by re-esterifying a polyvinyl alcohol resin by GPC, or by measuring the viscosity of an aqueous solution in accordance with JIS K 6726.
• GPC gel permeation chromatography
• the polyvinyl alcohol resin preferably has a viscosity of 30 mPa ⁇ s or less in a 4% by mass aqueous solution, which provides fluidity suitable for injection molding and water solubility suitable for use as a core.
• the viscosity of the 4% by mass aqueous solution is preferably 3 mPa ⁇ s or more, more preferably 5 mPa ⁇ s or more, and is preferably 20 mPa ⁇ s or less, more preferably 10 mPa ⁇ s or less.
• the viscosity of the 4% by mass aqueous solution can be measured, for example, by a method in accordance with JIS K6276 3.11.1 Rotational Viscometer Method.
• the polyvinyl alcohol resin is obtained by polymerizing a vinyl ester to obtain a polymer according to a conventional method, and then saponifying, i.e., hydrolyzing, the polymer.
• An alkali or acid is generally used as the saponification catalyst.
• the method for polymerizing vinyl esters is not particularly limited, but examples include solution polymerization, bulk polymerization, and suspension polymerization.
• Polymerization catalysts used to polymerize the vinyl esters include, for example, 2-ethylhexyl peroxydicarbonate (Trigonox EHP manufactured by Tianjin McEIT), 2,2'-azobisisobutyronitrile (AIBN), t-butyl peroxyneodecanoate, bis(4-t-butylcyclohexyl) peroxydicarbonate, di-n-propyl peroxydicarbonate, di-n-butyl peroxydicarbonate, di-cetyl peroxydicarbonate, and di-s-butyl peroxydicarbonate.
• One or more of the above polymerization catalysts may be used alone, or two or more may be used in combination.
• the polyvinyl alcohol resin may be a saponified polymer of a vinyl ester and another unsaturated monomer.
• unsaturated monomers include monomers other than the vinyl esters and having an unsaturated double bond such as a vinyl group.
• Specific examples include olefins, (meth)acrylic acid and salts thereof, (meth)acrylic acid esters, unsaturated acids other than (meth)acrylic acid, salts and esters thereof, (meth)acrylamides, N-vinylamides, vinyl ethers, nitriles, vinyl halides, allyl compounds, vinylsilyl compounds, isopropenyl acetate, sulfonic acid group-containing compounds, and amino group-containing compounds.
• Examples of olefins include ethylene, propylene, 1-butene, and isobutene.
• (meth)acrylic acid esters include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, i-propyl (meth)acrylate, n-butyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate.
• Examples of unsaturated acids other than (meth)acrylic acid, and salts and esters thereof include maleic acid and salts thereof, maleic acid esters, itaconic acid and salts thereof, itaconic acid esters, methylenemalonic acid and salts thereof, and methylenemalonic acid esters.
• Examples of (meth)acrylamides include acrylamide, n-methylacrylamide, N-ethylacrylamide, and N,N-dimethylacrylamide.
• Examples of N-vinylamides include N-vinylpyrrolidone.
• Examples of vinyl ethers include methyl vinyl ether, ethyl vinyl ether, n-propyl vinyl ether, i-propyl vinyl ether, and n-butyl vinyl ether.
• Examples of nitriles include (meth)acrylonitrile.
• Examples of vinyl halides include vinyl chloride and vinylidene chloride.
• the allyl compounds include allyl acetate and allyl chloride.
• Examples of the vinylsilyl compound include vinyltrimethoxysilane.
• Examples of sulfonic acid group-containing compounds include (meth)acrylamidoalkanesulfonic acids such as (meth)acrylamidopropanesulfonic acid and salts thereof, and olefinsulfonic acids such as ethylenesulfonic acid, allylsulfonic acid, and methallylsulfonic acid and salts thereof.
• Examples of the amino group-containing compound include allylamine, polyoxyethylene allylamine, polyoxypropylene allylamine, polyoxyethylene vinylamine, and polyoxypropylene vinylamine.
• the total surface area of the particulate filler per unit mass of the core resin composition calculated by the following formula (1) is preferably 10 m 2 /g or more.
• E density of particle filler (g/m 3 )
• the above formula (1) can be explained by the following formula (2).
• the total surface area is calculated by multiplying the surface area ( m2 ) per particulate filler (4 ⁇ (B/2) 2 ) by the number of particulate fillers per 1 g of the core resin composition.
• the density of the particulate filler even when the particulate filler is a hollow particle or a porous particle, a particle density is adopted that takes into account the volume including the cavities and pores inside the particle. It is important that the total surface area of the particulate filler does not take into account the areas of depressions and pores, and therefore in the above formula (2), the particulate filler is approximated as a sphere to calculate the total surface area of the particulate filler per unit mass of the resin composition for a core. By making the total surface area per unit mass 10 m2 or more, it is possible to further improve heat resistance and obtain a core resin composition that does not deform even under molding conditions for super engineering plastics.
• the total surface area per unit mass is more preferably 15 m 2 /g or more, even more preferably 20 m 2 /g or more, even more preferably 23 m 2 /g or more, particularly preferably 28 m 2 /g or more, and particularly preferably 35 m 2 /g or more.
• the particulate filler may be used alone or in combination of two or more types having different average particle sizes or materials. When two or more types are used in combination, the total surface area per unit mass can be determined by calculating the total surface area of each particulate filler using the above formula (1) for each particulate filler and adding them up.
• the total surface area of the particulate filler per unit mass can be adjusted by adjusting the average particle size of the particulate filler, the density of the particulate filler, and the amount of the particulate filler blended.
• the surface area of the particulate filler is calculated from the average particle size, density, and blending amount of the primary particles, but the particle shape is not necessarily limited to spherical.
• spherical shapes for example, plate-like, needle-like, rugby-like, hollow, porous, etc. are possible, and the particulate filler may have a higher-order structure in which multiple such shapes are connected or overlapped.
• the average particle size of the particulate filler is preferably 1 nm or more and 100 nm or less. By setting the average particle size within this range, the surface area of the particulate filler in the core resin composition can be kept within a certain range, and the required heat resistance can be imparted to the resin composition.
• the average particle size is preferably 2 nm or more, more preferably 3 nm or more, even more preferably 4 nm or more, more preferably 70 nm or less, even more preferably 50 nm or less, and even more preferably 30 nm or less.
• the average particle size is particularly preferably 5 nm or more, and particularly preferably 29 nm or less. By setting the average particle size within the above range, the particulate filler and the polyvinyl alcohol resin can be easily kneaded and mixed.
• the average particle size of the particulate filler can be measured, for example, by a particle size distribution measuring device.
• the density of the particulate filler is preferably 0.5 g/ cm3 or more, more preferably 0.7 g/ cm3 or more, even more preferably 0.9 g/ cm3 or more, particularly preferably 1.1 g/ cm3 or more, and is preferably 22 g/ cm3 or less, more preferably 13 g/ cm3 or less, even more preferably 6 g/ cm3 or less, particularly preferably 4.5 g/ cm3 or less.
• the density can be measured, for example, by an electronic densitometer, etc.
• the density of the particulate filler even when the particulate filler is a hollow particle or a porous particle, the particle density is adopted taking into consideration the volume including the cavities and pores inside the particle.
• Examples of materials for the particulate filler include metals, metal oxides, ceramics, carbon materials, glass, etc. Furthermore, resin particles having a melting point of 200° C. or higher can also be used as the particulate filler.
• Examples of the metal oxide include titanium oxide, aluminum oxide, calcium oxide, lithium oxide, molybdenum oxide, vanadium oxide, zinc oxide, nickel oxide, cesium oxide, iron oxide, etc. Other examples include boron nitride, aluminum nitride, gold, silver, copper, platinum, palladium, silicon carbide, etc.
• Examples of the carbon material include carbon black, graphite, and diamond. Among these, titanium oxide and carbon black are preferred from the viewpoints of cost performance, availability, etc.
• Examples of the resin having a melting point of 200° C. or higher include polyethylene terephthalate, polyamide, aromatic polyamide (aramid), polyimide, polyether ether ketone (PEEK), and the like.
• the content of the particulate filler in the core resin composition is preferably 5% by mass or more and 70% by mass or less. By setting the content within this range, heat resistance can be improved.
• the content of the particulate filler is more preferably 10% by mass or more, even more preferably 15% by mass or more, even more preferably 19% by mass or more, more preferably 50% by mass or less, even more preferably 40% by mass or less, even more preferably 35% by mass or less.
• the core resin composition may contain a crosslinking agent.
• the crosslinking agent include oxoacids, boron compounds, divalent or higher metal hydroxides, diamines, polyamines, etc. Metal salts of the above acids may also be used.
• Examples of the oxoacid include boric acid, silicic acid, phosphorous acid, polycarboxylic acid, and hydroxycarboxylic acid.
• the polycarboxylic acid is preferably an acid having two or more carboxyl groups
• the hydroxycarboxylic acid is preferably an acid having two or more carboxyl groups.
• Metal salts of the above acids are also acceptable.
• boric acid is particularly preferred. By using boric acid, a temporary protective material can be obtained that has sufficient water resistance during processing and can be easily removed with warm water when removal becomes necessary.
• Examples of boric acid include orthoboric acid, metaboric acid, and tetraboric acid.
• examples of the boron compound include salts of boric acid.
• the boron compound may also be a hydrate.
• examples of the salts of boric acid include borax, alkali metal salts such as sodium salts and potassium salts, alkaline earth metal salts such as calcium salts and magnesium salts, aluminum salts, and organic amine salts such as triethylamine, triethanolamine, morpholine, piperazine, and pyrrolidine.
• boric acid and borax are preferred.
• polycarboxylic acid examples include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, phthalic acid, poly(meth)acrylic acid, etc.
• succinic acid is preferred.
• hydroxycarboxylic acid examples include glycolic acid, lactic acid, tartronic acid, glyceric acid, hydroxybutyric acid, malic acid, tartaric acid, cytosine acid, citric acid, isocitric acid, leucinic acid, mevalonic acid, pantoic acid, ricinoleic acid, ricineraidic acid, cerebronic acid, quinic acid, shikimic acid, hydroxybenzoic acid, salicylic acid, creosote acid, vanillic acid, syringic acid, pyrocatechuic acid, resorcylic acid, protocatechuic acid, gentisic acid, orsellinic acid, gallic acid, mandelic acid, benzilic acid, atrolactic acid, mellotic acid, phloretic acid, coumaric acid, umbellic acid, caffeic acid, ferulic acid, sinapic acid, and hydroxystearic acid.
• the divalent or higher metal hydroxides include calcium hydroxide, magnesium hydroxide, barium hydroxide, aluminum hydroxide, iron hydroxide, zinc hydroxide, manganese hydroxide, and copper hydroxide.
• the crosslinking agents may be used alone or in combination of two or more. Among these, the crosslinking agent is preferably a boron compound, more preferably boric acid, from the viewpoint of both imparting heat resistance and maintaining water solubility.
• the content of the crosslinking agent in the core resin composition is preferably 0.01% by mass or more and 2% by mass or less. By keeping it within this range, an appropriate crosslinked structure can be imparted, improving heat resistance.
• the core resin composition may contain an easy-release agent. By including the easy-release agent, the core resin can be more easily removed from the molded body.
• a glycerin fatty acid ester compound can be used as the easy-peeling agent.
• the glycerin fatty acid ester compounds include monoglyceride stearic acid ester, monoglyceride oleic acid ester, and diglyceride lauric acid ester.
• the content of the easy-release agent in the core resin composition is preferably 0.1% by mass or more and 2% by mass or less. By setting the content within this range, the surface smoothness of the inside of the obtained molded product can be sufficiently improved.
• the content of the easy-release agent is more preferably 0.2% by mass or more, even more preferably 0.5% by mass or more, and more preferably 1.6% by mass or less, even more preferably 1.1% by mass or less.
• Antioxidants having both a phenolic functional group and a phosphorus functional group in one molecule include, but are not limited to, phosphite compounds having a phenol skeleton. Specific examples include 6-[3-(3-t-butyl-4-hydroxy-5-methylphenyl)propoxy]-2,4,8,10-tetra-t-butyldibenz[d,f][1,3,2]dioxaphosphepine, 2,10-dimethyl-4,8-di-t-butyl-6-[3-(3,5-di-t-butyl-4-hydroxyphenyl)propoxy]-12H-dibenzo[d,g][1,3,2]dioxaphosphene, 2,4,8,10-tetra-t-butyl-6-[3-(3,5-di-t-butyl-4-hydroxyphenyl)propoxy]dibenzo[d,f][1,3,2]dioxaphosphene, and
• the core can be used to produce a molded body. There are no particular restrictions on the material that is molded together with the core to form the composite, but since the resin composition for the core has particularly excellent heat resistance, it is possible to prevent deformation even when using super engineering plastics that are molded at high temperatures as the material.
• Titanium oxide 1 TTO-51(A) manufactured by Ishihara Sangyo Kaisha, Ltd., average particle size 20 nm, density 3.7 g/ cm Titanium oxide 2: PF-690 manufactured by Ishihara Sangyo Kaisha, Ltd., average particle size 210 nm, density 4.0 g/ cm Carbon black 1: TOKABLACK #5500 manufactured by Tokai Carbon Co., Ltd., average particle size 25 nm, density 1.9 g/cm 3 Carbon black 2: Seast TA manufactured by Tokai Carbon Co., Ltd., average particle size 122 nm, density 1.9 g/cm 3 Antioxidant: Sumilizer GP, manufactured by Sumitomo Chemical Co., Ltd.
• Plasticizer Diglycerin S (chemical name: diglycerin, molecular weight 166.17), manufactured by Sakamoto Pharmaceutical Co., Ltd.
• Easy-peel agent Monoglyceride stearate ester, Kao Corporation
• Electrostripper TS-5 The average particle size of the particulate filler was taken from the catalog value. The density was measured using an Accupyc II 1345 manufactured by Shimadzu Corporation.
• Example 1 Polyvinyl alcohol resin, particle filler, and antioxidant were mixed to obtain the formulation shown in Table 1, and the mixture was pelletized at an extrusion temperature of 190°C to 210°C using a processing device "TEM26SX" manufactured by Toshiba Machine Co., Ltd., to obtain pellets of a resin composition for a core.
• Example 2 Polyvinyl alcohol resin, particle filler, antioxidant and easy-release agent were mixed to obtain the formulation shown in Table 1, and pellets of a resin composition for a core were obtained in the same manner as in Example 1.
• melt flow rate (MFR) Using a melt index tester No. 120-FWP (manufactured by Yasuda Seiki Seisakusho, Ltd.), the melt flow rate (MFR) of the core resin composition was measured according to a method in accordance with ASTM D 1238 under conditions of an initial weight of the core resin composition of 7.5 g, 230°C, a load of 10 kg, and a measurement time interval of 0.25 minutes.
• the present invention provides a core resin composition that exhibits high heat resistance and can be used to produce cores that do not deform even under the molding conditions of super engineering plastics. It also provides cores made using this core resin composition.

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