WO2023149221A1 - 射出成形用樹脂組成物、当該組成物の射出成形方法 - Google Patents
射出成形用樹脂組成物、当該組成物の射出成形方法 Download PDFInfo
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- WO2023149221A1 WO2023149221A1 PCT/JP2023/001546 JP2023001546W WO2023149221A1 WO 2023149221 A1 WO2023149221 A1 WO 2023149221A1 JP 2023001546 W JP2023001546 W JP 2023001546W WO 2023149221 A1 WO2023149221 A1 WO 2023149221A1
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- Prior art keywords
- injection molding
- resin composition
- wax
- screw
- resin
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- 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
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- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
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- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
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- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
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- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
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- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
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- 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
- C08G59/20—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 epoxy compounds used
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- 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
- C08G59/62—Alcohols or phenols
- C08G59/621—Phenols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
- C08L91/06—Waxes
Definitions
- the present invention relates to a resin composition for injection molding and an injection molding method for the composition.
- Injection molding can improve productivity because the sealing material is supplied as it is.
- Patent Document 1 discloses an epoxy resin composition comprising an epoxy resin, a phenol compound curing agent, a curing accelerator, and an inorganic filler as essential components. The document describes that wax may be contained in the epoxy resin composition.
- Patent document 2 contains only a polyfunctional epoxy resin, a bifunctional epoxy resin, an epoxy resin curing agent, a curing accelerator, an inorganic filler, a silane coupling agent, and a release agent, is solid at room temperature, and has a predetermined
- An epoxy resin injection molding material is disclosed that satisfies the physical property values of Carnauba wax is described as a release agent. The document describes that the epoxy resin injection molding material has excellent moldability.
- the present inventors have found that the above problems can be solved by containing a specific wax, and have completed the present invention. That is, the present invention can be shown below.
- a resin composition for injection molding containing at least one wax (a) having a melting point of less than 80°C.
- An injection molding resin composition for use in an injection molding apparatus comprising The temperature T of the tip of the screw in the cylinder is 60 to 100° C., Any one of [1] to [3], wherein the wax includes a wax (b) having a melting point higher than the screw tip temperature T and a wax (a) having a melting point lower than the screw tip temperature T.
- an injection molding resin composition that suppresses backflow, has excellent metering accuracy, and has excellent moldability, and an injection molding method using the composition.
- the injection molding resin composition of the present embodiment contains wax.
- the wax contained in the resin composition for injection molding of the present embodiment contains at least one wax (a) having a melting point of less than 80°C.
- the wax (a) having a melting point of less than 80°C preferably contains a wax having a melting point of 65°C or less from the viewpoint of the effects of the present invention.
- Examples of the wax a include stearic acid (melting point 59 to 61° C.).
- the present embodiment from the viewpoint of the effect of the present invention, preferably 0.01 parts by mass or more and 10 parts by mass or less, more preferably 0 0.02 to 5 parts by mass, more preferably 0.05 to 1 part by mass, particularly preferably 0.1 to 0.5 parts by mass.
- the wax preferably further contains at least one wax (b) having a melting point higher than that of the wax (a).
- the melting point of the wax (b) is 80° C. or higher, preferably 80° C. or higher and 140° C. or lower, more preferably 80° C. or higher and 100° C. or lower, further preferably 80° C. or higher and 90° C. or lower, which is higher than the melting point of the wax (a). be able to.
- wax (b) examples include carnauba wax (melting point 80 to 86°C), polyethylene oxide wax (melting point 120 to 125°C), zinc stearate (melting point 120 to 130°C), and the like. can be used.
- the weight ratio a:b between wax (a) and wax (b) is preferably from 10:90 to 90:10, more preferably from 20:80 to 80:20, even more preferably It can be 30:70 to 70:30.
- the injection molding resin composition of this embodiment can be injection molded using the injection molding apparatus 1 shown in FIG.
- the injection molding apparatus 1 includes an injection unit 20 consisting of a cylinder 21 and a screw 22 inserted into the cylinder 21, and a mold 10 having a cavity 12. Details of the injection molding apparatus 1 will be described later.
- the temperature T of the tip of the screw 22 in the cylinder 21 is 60-100.degree.
- the wax includes a wax (b) having a melting point higher than the screw tip temperature T and 80°C or higher, and a wax (b) having a melting point lower than the screw tip temperature T and lower than 80°C. and wax (a).
- the injection molding resin composition of the present embodiment can contain a thermosetting resin.
- Thermosetting resins include one or more selected from the group consisting of epoxy resins, phenolic resins, oxetane resins, (meth)acrylate resins, unsaturated polyester resins, diallyl phthalate resins, and maleimide resins. .
- an epoxy resin from the viewpoint of improving curability, storage stability, heat resistance, moisture resistance, and chemical resistance, it is particularly preferable to contain an epoxy resin.
- epoxy resins include, for example, biphenyl type epoxy resins; bisphenol type epoxy resins such as bisphenol A type epoxy resins, bisphenol F type epoxy resins and tetramethylbisphenol F type epoxy resins; stilbene type epoxy resins; Novolac type epoxy resins such as resins, ortho-cresol novolak type epoxy resins; triphenol methane type epoxy resins, polyfunctional epoxy resins such as trisphenol type epoxy resins exemplified by alkyl-modified triphenol methane type epoxy resins; phenol aralkyl epoxy resins such as phenol aralkyl epoxy resins having a phenylene skeleton, naphthol aralkyl epoxy resins having a phenylene skeleton, phenol aralkyl epoxy resins
- the epoxy resin preferably contains a polyfunctional epoxy resin having three or more epoxy groups in the repeating structure of the epoxy resin skeleton.
- a polyfunctional epoxy resin By using a polyfunctional epoxy resin, the glass transition temperature of the cured product can be improved.
- thermosetting resin it is more preferable to include an epoxy resin having a softening point of less than 80°C as the thermosetting resin.
- an epoxy resin having a softening point of less than 80° C. By using an epoxy resin having a softening point of less than 80° C., a low-viscosity resin composition for injection molding can be obtained, and continuous injection molding becomes possible, resulting in excellent productivity.
- the content of the thermosetting resin in the injection molding resin composition is preferably 2% by mass or more, more preferably 3% by mass or more, and 4% by mass of the entire injection molding resin composition. % or more is particularly preferred.
- the content of the thermosetting resin is preferably 50% by mass or less, more preferably 30% by mass or less, relative to the entire injection molding resin composition. , 15 mass % or less.
- the resin composition for injection molding of this embodiment can contain a curing agent.
- Curing agents can be broadly classified into, for example, polyaddition type curing agents, catalyst type curing agents, and condensation type curing agents.
- Polyaddition-type curing agents used as curing agents include, for example, diethylenetriamine (DETA), triethylenetetramine (TETA), aliphatic polyamines such as metaxylylenediamine (MXDA), diaminodiphenylmethane (DDM), and m-phenylenediamine. (MPDA), diaminodiphenylsulfone (DDS) and other aromatic polyamines, polyamine compounds including dicyandiamide (DICY), organic acid dihydralazide, etc.; hexahydrophthalic anhydride (HHPA), methyltetrahydrophthalic anhydride (MTHPA), etc.
- DETA diethylenetriamine
- TETA triethylenetetramine
- aliphatic polyamines such as metaxylylenediamine (MXDA), diaminodiphenylmethane (DDM), and m-phenylenediamine.
- MXDA metaxylylenediamine
- Acid anhydrides including aromatic acid anhydrides such as alicyclic acid anhydrides, trimellitic anhydride (TMA), pyromellitic anhydride (PMDA), and benzophenonetetracarboxylic acid (BTDA); novolak phenolic resins, polyvinyl Phenolic resin-based curing agents such as phenol and aralkyl-type phenol resins; Polymercaptan compounds such as polysulfide, thioester and thioether; Isocyanate compounds such as isocyanate prepolymers and blocked isocyanates; Organic acids such as carboxylic acid-containing polyester resins. Including one or more selected types.
- Catalytic curing agents used as curing agents include tertiary amine compounds such as benzyldimethylamine (BDMA) and 2,4,6-trisdimethylaminomethylphenol (DMP-30); Lewis acids such as BF3 complexes; One type or two or more types selected from the group consisting of
- Condensation-type curing agents used as curing agents are, for example, one or more selected from the group consisting of resol-type phenolic resins; urea resins such as methylol group-containing urea resins; and melamine resins such as methylol group-containing melamine resins. including.
- a phenol resin-based curing agent from the viewpoint of improving the balance of flame resistance, moisture resistance, electrical properties, curability, storage stability, and the like.
- a phenol resin-based curing agent monomers, oligomers, and polymers in general having two or more phenolic hydroxyl groups in one molecule can be used, and the molecular weight and molecular structure are not particularly limited.
- Phenolic resin-based curing agents used as curing agents include, for example, phenol novolak resins, cresol novolak resins, novolac type phenol resins such as bisphenol novolak resins; polyvinylphenol; polyfunctional phenol resins such as triphenolmethane type phenol resins; Modified phenolic resins such as resins and dicyclopentadiene-modified phenolic resins; Phenol aralkyl resins having a phenylene skeleton and/or biphenylene skeleton; Phenol aralkyl-type phenolic resins such as naphthol aralkyl resins having a phenylene and/or biphenylene skeleton; It contains one or more selected from the group consisting of bisphenol compounds such as F. Among these, from the viewpoint of improving the curability of the resin composition for injection molding, it is more preferable to include at least one of a novolak-type phenol resin and a phenol-aral
- the content of the curing agent in the injection molding resin composition is preferably 1% by mass or more, more preferably 2% by mass or more, and 3% by mass or more with respect to the entire injection molding resin composition. is particularly preferred.
- the content of the curing agent in the injection molding resin composition is preferably 40% by mass or less, more preferably 25% by mass or less, based on the total injection molding resin composition. % by mass or less is particularly preferred.
- the injection molding resin composition of the present embodiment contains an epoxy resin having a softening point of less than 80°C as a thermosetting resin, or a curing agent having a softening point of less than 80°C as a curing agent. It is more preferable that each of the softening points is less than 80°C.
- an epoxy resin having a softening point of less than 80°C and/or a curing agent having a softening point of less than 80°C a low-viscosity resin composition for injection molding can be obtained and continuous injection molding becomes possible. Better productivity.
- the injection molding resin composition of the present embodiment can contain an inorganic filler.
- the inorganic filler is selected from the group consisting of, for example, glass fiber, silica such as fused crushed silica, spherical silica, and crystalline silica, alumina, aluminum hydroxide, magnesium hydroxide, calcium carbonate, silicon nitride, and aluminum nitride.
- silica such as fused crushed silica, spherical silica, and crystalline silica
- alumina aluminum hydroxide, magnesium hydroxide, calcium carbonate, silicon nitride, and aluminum nitride.
- magnesium hydroxide magnesium hydroxide
- calcium carbonate silicon nitride
- spherical silica and fused and crushed silica preferably contains glass fiber, spherical silica, fused and crushed silica, and calcium carbonate, and more preferably contains spherical silica and fused and crushed silica.
- the inorganic filler contains silica
- it preferably contains silica having an average particle size D50 of 1 ⁇ m or more and 50 ⁇ m or less. This makes it possible to more effectively improve the balance among fillability, adhesion, moisture resistance, heat resistance, and the like.
- the average particle diameter D50 of silica can be measured, for example, using a commercially available laser particle size distribution analyzer (eg, SALD-7000 manufactured by Shimadzu Corporation).
- the content of the inorganic filler in the resin composition for injection molding is preferably 50% by weight or more, more preferably 60% by weight or more, relative to the entire resin composition.
- the content of the inorganic filler in the resin composition for injection molding is preferably 90% by weight or less, more preferably 85% by weight or less, relative to the entire resin composition for injection molding.
- the injection molding resin composition of the present embodiment can contain a curing accelerator (curing catalyst). Any known curing accelerator can be used as long as it accelerates the cross-linking reaction between the thermosetting resin and the curing agent.
- Curing accelerators include, for example, imidazole, 2-undecylimidazole, 2-heptadecylimidazole, 1,2-dimethylimidazole, 2-ethyl-4-methylimidazole (EMI24), 2-phenylimidazole, 2-phenyl- 4-methylimidazole (2P4MZ), 1-benzyl-2-phenylimidazole, 1-benzyl-2-methylimidazole, 1-cyanoethyl-2-methylimidazole, 1-cyanoethyl-2-ethyl-4-methylimidazole, 1- Cyanoethyl-2-undecylimidazole, 1-cyanoethyl-2-phenylimidazole, 1-cyanoethyl-2-undecylimidazolium trimellitate, 1-cyanoethyl-2-phenylimidazolium trimellitate, 2,4-diamino- 6-[2′-methylimidazolyl (1
- the number of functional groups in the curing accelerator is preferably 3 or less, more preferably 2 or less.
- the lower limit of the content of the curing accelerator is, for example, preferably 0.02% by mass or more, and 0.05% by mass or more with respect to the total solid content of the resin composition for injection molding. It is more preferable that the content is 0.1% by mass or more, and it is particularly preferable that the content is 0.1% by mass or more.
- the upper limit of the content of the curing accelerator is, for example, preferably 3.0% by mass or less and 2.0% by mass or less with respect to the total solid content of the resin composition for injection molding. is more preferably 1.0% by mass or less, and particularly preferably 0.5% by mass or less.
- the lower limit of the content of the curing accelerator is, for example, preferably 0.3% by mass or more, more preferably 0.5% by mass or more, relative to the total solid content of the epoxy resin. , 0.8% by mass or more.
- the upper limit of the content of the curing accelerator is, for example, preferably 5.0% by mass or less, more preferably 3.0% by mass or less, relative to the total solid content of the epoxy resin. 2.0% by mass or less is particularly preferable.
- One or more of various additives such as silane coupling agents, colorants, ion scavengers, oils, low-stress agents, and flame retardants may optionally be added to the injection molding resin composition of the present embodiment. can be appropriately blended.
- the injection molding resin composition of the present embodiment can be obtained by mixing the above components by a conventionally known method.
- the resin composition for injection molding of the present embodiment is excellent in moldability because backflow into the hopper is suppressed and measurement accuracy is excellent.
- the resin composition for injection molding of this embodiment can be molded at a low pressure of 40 MPa or less, and can be molded continuously at an injection speed of 10 mm/sec.
- the injection molding method of this embodiment can be performed using the injection molding apparatus 1 shown in FIG.
- the injection molding apparatus 1 includes an injection unit 20 consisting of a cylinder 21 and a screw 22 inserted into the cylinder 21, and a mold 10 having a cavity 12.
- the injection molding method of this embodiment includes: a step of melting the injection molding resin composition of the present embodiment in the cylinder 21; and a step of injecting the molten resin composition using the screw 22 to fill the cavity 12 .
- An injection molding apparatus 1 a mold 10 having a molding space (cavity 12) such as gates, runners, and gates, and an injection molding machine 20 for injection molding.
- the injection molding machine 20 includes, for example, a cylinder 21, a screw 22 rotatable within the cylinder 21, a hopper 23 into which a resin composition for injection molding can be introduced into the cylinder 21, and a phenolic resin composition through the cylinder 21. and a nozzle 25 for feeding the molding material kneaded in the cylinder 21 to the mold 10.
- the screw 22 has a backflow valve 26 at its tip.
- a resin composition for injection molding is put into the heated injection molding machine 20 .
- the resin composition for injection molding is kneaded by the screw 22 while being heated and melted by the heater 24 within the cylinder 21 .
- the temperature T of the tip of the screw 22 in the cylinder 21 is 60-100.degree.
- the wax includes a wax (b) having a melting point higher than the screw tip temperature T and 80°C or higher, and a wax (b) having a melting point lower than the screw tip temperature T and lower than 80°C. and wax (a).
- the injection molding resin composition melted by the screw 22 is fed while being compressed and kneaded in the direction of the nozzle 25, and the screw 22 descends backward (opposite direction to the nozzle 25). At this time, a back pressure is applied to push the screw 22 from behind, and pressure can be applied to the resin composition for injection molding gathered in the nozzle 25 . Then, the resin composition for injection molding gathered at the nozzle 25 at the tip of the screw 21 is metered to a set position.
- the resin composition for injection molding of the present embodiment is suppressed from sticking to a screw or the like, and can be measured accurately.
- the measured resin composition for injection molding is injected into the cavity 12 of the mold 10 through the nozzle 25 by the pressure of the screw 22 by advancing the screw 21 which is lowered backward.
- the injection molding resin composition of the present embodiment has excellent moldability, and the injection molding resin composition in the cylinder is suppressed from flowing backward (backflow) into the hopper during injection.
- the resin composition for injection molding of this embodiment is excellent in low-temperature moldability, and the temperature inside the cavity 12 can be set to 150 to 160.degree.
- the resin composition for injection molding is cured in the cavity 12, then the mold 10 is opened and the molded body is taken out from the cavity 12.
- the resin composition for injection molding containing the wax (a) and the wax (b) of the present embodiment is excellent in releasability.
- an in-vehicle electronic control unit or the like sealed with the resin composition for injection molding it is possible to provide an in-vehicle electronic control unit or the like sealed with the resin composition for injection molding.
- An in-vehicle electronic control unit will be described below as an example.
- the in-vehicle electronic control unit 30 is used to control the engine, various in-vehicle devices, and the like. As shown in FIG. 1, the in-vehicle electronic control unit 30 includes, for example, a wiring board 32, a plurality of electronic components 36 mounted on at least one surface of the wiring board 32, and the electronic components 36 sealed. and a sealing resin 34 made of a resin composition for injection molding.
- the wiring board 32 has connection terminals 38 for connection with the outside on at least one side.
- the in-vehicle electronic control unit 30 according to one example of the present embodiment is electrically connected to the counterpart connector via the connection terminal 38 by fitting the connection terminal 38 to the counterpart connector.
- the wiring board 32 is, for example, a wiring board provided with circuit wiring on one or both of one surface and the other surface opposite to the one surface. As shown in FIG. 1, the wiring board 32 has, for example, a flat plate shape. In this embodiment, an organic substrate made of an organic material such as polyimide can be employed as the wiring substrate 32 .
- the wiring board 32 may have a through hole 40 that penetrates the wiring board 32 and connects one surface and the other surface, for example. In this case, the wiring provided on one surface of the wiring board 32 and the wiring provided on the other surface are electrically connected via the conductor pattern provided in the through hole 40 .
- the wiring board 32 has a solder resist layer on one surface on which electronic components 36 are mounted, for example.
- the solder resist layer can be formed using a solder resist-forming resin composition that is commonly used in the field of semiconductor devices.
- solder resist layers can be provided on one surface and the other surface of the wiring board 32 .
- the solder resist layer provided on one surface of wiring board 32, or on both one surface and the other surface is formed of, for example, a resin composition containing a silicone compound. Thereby, a solder resist layer having excellent surface smoothness can be realized.
- the plurality of electronic components 36 are mounted, for example, on one surface and the other surface of the wiring board 32, as shown in FIG. On the other hand, the electronic component 36 may be provided only on one surface of the wiring board 32 and may not be provided on the other surface of the wiring board 32 .
- the electronic component 36 is not particularly limited as long as it can be mounted on an in-vehicle electronic control unit, and examples include a microcomputer.
- the sealing resin 34 is formed by molding the resin composition for injection molding of the present embodiment so as to seal the electronic component 36 and curing it.
- the sealing resin 34 is formed so as to seal the wiring board 32 together with the electronic component 36, for example.
- a sealing resin 34 is provided so as to seal one surface and the other surface of the wiring board 32 and electronic components 36 mounted on the wiring board 32 .
- the sealing resin 34 is formed so as to partially or entirely seal the wiring board 32, for example.
- FIG. 2 illustrates a case where the sealing resin 34 is provided so as to seal the entire other portion of the wiring board 32 without sealing the connection terminals 38 so that the connection terminals 38 are exposed.
- the wiring board 32 may be mounted, for example, on a metal base.
- the metal base can function as a heat sink for dissipating heat generated from the electronic component 36, for example.
- the vehicle electronic control unit 30 is formed by integrally sealing and molding a metal base and a wiring board 32 mounted on the metal base with a resin composition for injection molding. can be done.
- the metal material constituting the metal base is not particularly limited, but may include, for example, iron, copper, aluminum, and alloys containing one or more of these. Note that the in-vehicle electronic control unit 30 does not have to have a metal base.
- the in-vehicle electronic control unit 30 illustrated in FIG. 1 is formed by encapsulating a plurality of electronic components 36 with the injection molding resin composition of the present embodiment by injection molding.
- the wiring board 32 on which a plurality of electronic components 36 are mounted is arranged in the cavity 12 of the mold 10 .
- the shape of the cavity 12 is appropriately changed so as to match the shape of the in-vehicle electronic control unit 30 .
- the injection molding resin composition of the present embodiment is put through a hopper 23 into a cylinder 21 having a screw 22 inside, and the injection molding resin composition is melted at an extruder temperature of 80° C. or more and 100° C. . Molten resin is moved inside the extruder by a screw and injected into the cavity 12 of the mold via a gate to seal the plurality of electronic components 36 .
- Inorganic filler/Silica 1 Fused spherical silica (FB-105, manufactured by Denka, average particle diameter 10.6 ⁇ m, specific surface area 5.1 m 2 /g, upper limit cut 71 ⁇ m) ⁇
- Silica 2 Fused spherical silica (SC-2500-SQ, manufactured by Admatechs, average particle size 0.6 ⁇ m) ⁇
- Silica 3 crushed silica (RD-8, manufactured by Tatsumori, average particle size 15 ⁇ m)
- Coupling agent/coupling agent 1 N-phenyl-3-aminopropyltrimethoxysilane (KBM-573, manufactured by Shin-Etsu Chemical Co., Ltd.)
- Coupling agent 2 3-mercaptopropyltrimethoxysilane (S810, manufactured by Chisso)
- Coupling agent 3 3-glycidoxypropyltrimethoxysilane (S510, manufactured by Chisso)
- Thermosetting resin/epoxy resin 1 cresol novolak type epoxy resin (EOCN-1020-55, manufactured by Nippon Kayaku Co., Ltd., softening point 55° C., equivalent weight 196 g/eq, number average molecular weight 490) ⁇
- Epoxy resin 2 cresol novolac type epoxy resin (EOCN-1020-65, manufactured by Nippon Kayaku Co., Ltd., softening point 65 ° C., equivalent weight 199 g / eq, number average molecular weight 614) -
- Epoxy resin 3 cresol novolac type epoxy resin (EPICRON N680, manufactured by DIC, softening point 85 ° C., equivalent weight 211 g / eq)
- Epoxy resin 4 bisphenol A type epoxy resin (JER1001, manufactured by Mitsubishi Chemical Corporation, softening point 64 ° C., equivalent weight 450-500 g / eq, number average molecular weight 900)
- Curing agent/curing agent 1 Novolak phenolic resin (PR-HF-3, manufactured by Sumitomo Bakelite Co., Ltd., softening point 80° C., equivalent weight 105 g/eq, number average molecular weight 392, weight average molecular weight 667)
- Curing agent 2 Novolac phenol resin (PR-51470, manufactured by Sumitomo Bakelite Co., Ltd., softening point 110 ° C., equivalent weight 103 g / eq, number average molecular weight 617, weight average molecular weight 2201)
- Curing catalyst/curing catalyst 1 2-phenylimidazole (2PZ-PW, manufactured by Shikoku Kasei Co., Ltd.)
- Wax/Wax 1 Oxidized polyethylene wax (Ricowax PED191, manufactured by Clariant Japan, melting point 120 to 125°C)
- ⁇ Wax 2 Carnauba wax (Nikko Carnauba, manufactured by Nikko Fine Co., Ltd., melting point 80 to 86 ° C.)
- ⁇ Wax 3 stearic acid (SR-Sakura, manufactured by NOF Corporation, melting point 59-61°C)
- Coloring agent/coloring agent 1 carbon black (#5, manufactured by Mitsubishi Chemical Corporation)
- the rectangular flow path pressure (rectangular pressure) of the resin composition for injection molding obtained in each example was measured as follows. First, the resin composition for injection molding (pulverized material) was heated at 175° C. for 3 seconds in a plunger (plunger size ⁇ 18 mm) to soften it. Using a low-pressure transfer molding machine (manufactured by NEC Corporation, 40t manual press), a rectangular shape with a width of 13 mm, a thickness of 0.5 mm, and a length of 175 mm was obtained under the conditions of a mold temperature of 175 ° C. and an injection speed of 24.7 mm / sec. The softened resin composition for injection molding obtained above was injected into the flow path of .
- a pressure sensor embedded at a position 25 mm from the upstream end of the flow channel was used to measure the change in pressure over time, and the minimum pressure (kgf/cm 2 ) during flow of the resin composition for injection molding was measured. is the rectangular pressure. Rectangular pressure is a parameter of melt viscosity, and a smaller numerical value indicates a lower melt viscosity.
- Tg Glass transition temperature
- the resin compositions for injection molding of Examples containing a wax having a melting point of less than 80° C. were excellent in moldability because backflow was suppressed and the accuracy of weighing was excellent. Further, as in Examples 1, 3, and 4, the combination of a wax having a melting point of less than 80° C. and a wax having a higher melting point than that of the wax was used, resulting in better releasability.
- Examples 2 to 4 by containing an epoxy resin or a curing agent having a softening point of less than 80°C, the rectangular pressure is small and the melt viscosity is low, so that a low-viscosity resin composition for injection molding can be obtained. It was superior in productivity because it enabled continuous injection molding.
- Injection Molding Apparatus 10 Mold 12 Cavity 20 Injection Molding Machine 21 Cylinder 22 Screw 23 Hopper 24 Heater 25 Nozzle 26 Backflow Valve 30 Automotive Electronic Control Unit 32 Wiring Board 34 Sealing Resin 36 Electronic Component 38 Connection Terminal 40 Through Hole
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Abstract
Description
[2] 前記ワックス(a)は、融点65℃以下のワックスを含む、[1]に記載の射出成形用樹脂組成物。
[3] さらに、前記ワックス(a)の融点以上の融点を有するワックス(b)を少なくとも1種含む、[1]または[2]に記載の射出成形用樹脂組成物。
[4] シリンダーおよび前記シリンダーに挿入されたスクリューからなる射出ユニットと、
当該射出ユニットから溶融組成物が充填されるキャビティを有する金型と、
を備える射出成形装置に用いられる射出成形用樹脂組成物であって、
前記シリンダー内の前記スクリュー先端の温度Tは60~100℃であり、
前記ワックスは、前記スクリュー先端の温度Tを超える融点を有するワックス(b)と、前記スクリュー先端の温度T未満の融点を有するワックス(a)とを含む、[1]~[3]のいずれかに記載の射出成形用樹脂組成物。
[5] 前記キャビティ内の温度は150~160℃である、[4]に記載の射出成形用樹脂組成物。
[6] 軟化点80℃未満のエポキシ樹脂、または軟化点80℃未満の硬化剤を含む、[1]~[5]のいずれかに記載の射出成形用樹脂組成物。
[7] シリンダーおよび前記シリンダーに挿入されたスクリューからなる射出ユニットと、
キャビティを有する金型と、
を備える、射出成形装置を用いた射出成形方法であって、
前記シリンダー内で、[1]~[6]のいずれかに記載の射出成形用樹脂組成物を溶融する工程と、
前記スクリューを用いて溶融樹脂組成物を射出し、前記キャビティ内に充填する工程と、
を含む、射出成形方法。
[8] 前記シリンダー内の前記スクリュー先端の温度Tは60~100℃である、[7]に記載の射出成形方法。
[9] 前記キャビティ内の温度は150~160℃である、[7]または[8]に記載の射出成形方法。
本実施形態の射出成形用樹脂組成物に含まれるワックスは、融点80℃未満のワックス(a)を少なくとも1種含む。
ワックスaとしては、ステアリン酸(融点59~61℃)等が挙げられる。
ワックス(a)とともにワックス(b)を含むことにより、バックフローが抑制されるとともに計量の正確性に優れ、さらに射出成形後の硬化物の金型からの離型性により優れる。
本実施形態において、前記ワックスは、前記スクリュー先端の温度Tを超え、かつ80℃以上の融点を有するワックス(b)と、前記スクリュー先端の温度T未満であり、かつ80℃未満の融点を有するワックス(a)とを含む。これにより、バックフローが抑制されるとともに計量の正確性に優れ、さらに射出成形用樹脂組成物の硬化物が金型からの離型性に優れることから連続射出成型が可能となり生産性に優れる。
本実施形態の射出成形用樹脂組成物は熱硬化性樹脂を含むことができる。
熱硬化性樹脂としては、たとえばエポキシ樹脂、フェノール樹脂、オキセタン樹脂、(メタ)アクリレート樹脂、不飽和ポリエステル樹脂、ジアリルフタレート樹脂、およびマレイミド樹脂からなる群から選択される一種類または二種類以上を含む。これらの中でも、硬化性、保存性、耐熱性、耐湿性、および耐薬品性を向上させる観点から、エポキシ樹脂を含むことがとくに好ましい。
本実施形態の射出成形用樹脂組成物は硬化剤を含むことができる。
硬化剤としては、たとえば重付加型の硬化剤、触媒型の硬化剤、および縮合型の硬化剤の3タイプに大別することができる。
本実施形態の射出成形用樹脂組成物は、無機充填剤を含むことができる。
無機充填剤としては、たとえば、ガラス繊維、溶融破砕シリカ、球状シリカ、結晶シリカ等のシリカ、アルミナ、水酸化アルミニウム、水酸化マグネシウム、炭酸カルシウム、窒化珪素、および窒化アルミからなる群から選択される一種類または二種類以上を含むことができる。これらの中でも、汎用性に優れている観点から、ガラス繊維、球状シリカ、溶融破砕シリカ、炭酸カルシウムを含むことが好ましく、球状シリカ、溶融破砕シリカを含むことがより好ましい。
本実施形態の射出成形用樹脂組成物は、硬化促進剤(硬化触媒)を含むことができる。硬化促進剤は、熱硬化性樹脂と、硬化剤と、の架橋反応を促進させるものであればよく、公知のものを用いることができる。
1,1’-(4-メチル-m-フェニレン)ビス(3,3-ジメチル尿素)、N,N’-ジメチル尿素等の尿素系触媒などが挙げられる。これらを単独で用いても2種以上を組み合わせて用いてもよい。
また、低温硬化性と充填性のバランスの観点から、硬化促進剤の官能基は、例えば、3個以下が好ましく、2個以下がより好ましい。
本実施形態の射出成形用樹脂組成物には、必要に応じて、たとえばシランカップリング剤、着色剤、イオン捕捉剤、オイル、低応力剤、および難燃剤等の各種添加剤のうち1種以上を適宜配合することができる。
本実施形態の射出成形用樹脂組成物は、上記成分を従来公知の方法により混合することにより得ることができる。本実施形態の射出成形用樹脂組成物は、ホッパー内へ逆流が抑制されるとともに計量の正確性に優れることから、成形性に優れる。
本実施形態の射出成形用樹脂組成物は、40MPa以下での低圧成形が可能であり、射出速度10mm/secで連続成形が可能である。
本実施形態の射出成形方法は、図1に示される射出成形装置1を用いて行うことができる。射出成形装置1は、シリンダー21およびシリンダー21に挿入されたスクリュー22からなる射出ユニット20と、キャビティ12を有する金型10と、を備える。
シリンダー21内で、本実施形態の射出成形用樹脂組成物を溶融する工程と、
スクリュー22を用いて溶融樹脂組成物を射出し、キャビティ12内に充填する工程と、を含む。
本実施形態において、前記ワックスは、前記スクリュー先端の温度Tを超え、かつ80℃以上の融点を有するワックス(b)と、前記スクリュー先端の温度T未満であり、かつ80℃未満の融点を有するワックス(a)とを含む。これにより、バックフローが抑制されるとともに計量の正確性に優れ、さらに射出成形用樹脂組成物の硬化物が金型からの離型性に優れることから連続射出成型が可能となり生産性に優れる。
本実施形態の射出成形用樹脂組成物は低温成形性に優れており、キャビティ12内の温度を150~160℃とすることができる。
以下、車載用電子制御ユニットを例に説明する。
車載用電子制御ユニット30は、エンジンや各種車載機器等を制御するために用いられる。図1に示すように、車載用電子制御ユニット30は、たとえば配線基板32と、配線基板32の少なくとも一面に搭載された複数の電子部品36と、電子部品36を封止する、本実施形態の射出成形用樹脂組成物からなる封止樹脂34と、を備えている。配線基板32は、少なくとも一辺において、外部と接続するための接続端子38を有している。本実施形態の一例に係る車載用電子制御ユニット30は、接続端子38と相手方コネクタを嵌合することによって、接続端子38を介して上記相手方コネクタに電気的に接続されることとなる。
複数の電子部品36は、図2に示すように、たとえば配線基板32の一面と他面のそれぞれに搭載される。一方で、電子部品36は、配線基板32の一面のみに設けられ、配線基板32の他面には設けられていなくともよい。電子部品36としては、車載用電子制御ユニットに搭載され得るものであればとくに限定されないが、たとえばマイクロコンピュータが挙げられる。
実施例1~4および比較例1~4のそれぞれについて、以下のように射出成形用樹脂組成物を調製した。
まず、表1に示す配合に従って、各成分を、室温状態に設定したヘンシェルミキサー(容量200リットル、回転数900rpm)で20分間予備混合した。次いで、得られた混合物を、連続式回転ボールミル(日本コークス工業(株)製ダイナミックミルMYD25、スクリュー回転数500rpm、アルミナ製ボール径10mm、装置容積に対するボールの体積充填率50%)を用いて、材料供給量200kg/hrで材料温度を30℃以下に保ちながら微粉砕した。次いで、微粉砕された混合物を、10インチの2本ロールを用いて混錬した。ロール温度は105℃と15℃に設定されて混錬した。混錬時間は5分間とした。次いで、混練後の混合物を冷却し、粉砕して射出成形用樹脂組成物を得た。なお、ヘンシェルミキサーによる予備混合から、射出成形用樹脂組成物を得るまでの各工程は、連続的に行った。なお、表1中における各成分の詳細は下記のとおりである。また、表1中の単位は、重量%である。
なお、実施例においては以下の成分を用いた。
・シリカ1:溶融球状シリカ(FB-105、デンカ社製、平均粒径10.6μm、比表面積5.1m2/g、上限カット71μm)
・シリカ2:溶融球状シリカ(SC-2500-SQ、アドマテックス社製、平均粒径0.6μm)
・シリカ3:破砕シリカ(RD-8、龍森社製、平均粒径15μm)
・カップリング剤1:N-フェニル-3-アミノプロピルトリメトキシシラン(KBM-573、信越化学工業社製)
・カップリング剤2:3-メルカプトプロピルトリメトキシシラン(S810、チッソ社製)
・カップリング剤3:3-グリシドキシプロピルトリメトキシシラン(S510、チッソ社製)
・エポキシ樹脂1:クレゾールノボラック型エポキシ樹脂(EOCN-1020-55、日本化薬社製、軟化点55℃、当量196g/eq、数平均分子量490)
・エポキシ樹脂2:クレゾールノボラック型エポキシ樹脂(EOCN-1020-65、日本化薬社製、軟化点65℃、当量199g/eq、数平均分子量614)
・エポキシ樹脂3:クレゾールノボラック型エポキシ樹脂(EPICRON N680、DIC社製、軟化点85℃、当量211g/eq)
・エポキシ樹脂4:ビスフェノールA型エポキシ樹脂(JER1001、三菱ケミカル社製、軟化点64℃、当量450-500g/eq、数平均分子量900)
・硬化剤1:ノボラック型フェノール樹脂(PR-HF-3、住友ベークライト社製、軟化点80℃、当量105g/eq、数平均分子量392、重量平均分子量667)
・硬化剤2:ノボラック型フェノール樹脂(PR-51470、住友ベークライト社製、軟化点110℃、当量103g/eq、数平均分子量617、重量平均分子量2201)
・硬化触媒1:2-フェニルイミダゾール(2PZ-PW、四国化成社製)
・ワックス1:酸化ポリエチレンワックス(リコワックス PED191、クラリアント・ジャパン社製、融点120~125℃)
・ワックス2:カルナバワックス(ニッコウカルナバ、日興ファイン社製、融点80~86℃)
・ワックス3:ステアリン酸(SR-サクラ、日本油脂社製、融点59~61℃)
・着色剤1:カーボンブラック(#5、三菱化学社製)
100tの電動横型射出成型機を用い、以下の条件で20回計量と射出を繰り返し、バックフローが発生しなかったものを〇、バックフローが発生したものを×と評価した。
・条件
スクリュー温調(先端から順に80℃/20℃/20℃)
背圧:1MPa
スクリュー回転数:10rpm
射出速度:10mm/sec
計量を62mm、VP切り替え位置5mm、保圧10MPa
また、この時計量トルクの曲線が、20shot同じ挙動、値であったものを〇、挙動が各Shotばらばらであり、値もばらついたものを×として計量トルク安定性を評価した。
上記条件を用い、金型にISO試験片を用いて20shot成形を行った。20shot成形可能であったものを〇、固定側の金型に貼り付いたり、未充填が起きたものを×とした。
この時金型温度は160℃に設定し、硬化時間を80秒とした。
低圧トランスファー成形機(コータキ精機社製、KTS-15)を用いて、ANSI/ASTM D 3123-72に準じたスパイラルフロー測定用金型に、金型温度175℃、注入圧力6.9MPa、保圧時間120秒の条件にて、射出成形用樹脂組成物を注入し、流動長を測定した。
スパイラルフローは、流動性のパラメータであり、数値が大きい方が、流動性が良好である。
各例で得られた射出成形用樹脂組成物の矩形流路圧(矩形圧)を次のように測定した。
まず、射出成形用樹脂組成物(粉砕物)を、プランジャー(プランジャーサイズφ18mm)内で、175℃で3秒間加熱して予備加熱して軟化させた。
低圧トランスファー成形機(NEC社製、40tマニュアルプレス)を用いて、金型温度175℃、注入速度24.7mm/secの条件にて、幅13mm、厚さ0.5mm、長さ175mmの矩形状の流路に、上記で得られた、軟化した射出成形用樹脂組成物を注入した。このとき、流路の上流先端から25mmの位置に埋設した圧力センサーにて圧力の経時変化を測定し、射出成形用樹脂組成物の流動時における最低圧力(kgf/cm2)を測定し、これを矩形圧とした。矩形圧は、溶融粘度のパラメータであり、数値が小さい方が、溶融粘度が低いことを示す。
JIS6911曲げ試験片を175℃3分で成形し、流動方向のTMA測定を実施し、屈曲点をTgとした。昇温5℃/分で実施した。成形後(硬化なし)のTgが高いほど、成形サイクルを短くできると考えられる。
また、実施例2~4のように、軟化点80℃未満のエポキシ樹脂または硬化剤を含むことにより、矩形圧が小さく、溶融粘度が低いことから、低粘度の射出成形用樹脂組成物が得られ、連続射出成形が可能になることから生産性により優れていた。
10 金型
12 キャビティ
20 射出成形機
21 シリンダー
22 スクリュー
23 ホッパー
24 ヒーター
25 ノズル
26 逆流弁
30 車載用電子制御ユニット
32 配線基板
34 封止樹脂
36 電子部品
38 接続端子
40 スルーホール
Claims (9)
- 融点80℃未満のワックス(a)を少なくとも1種含む、射出成形用樹脂組成物。
- 前記ワックス(a)は、融点65℃以下のワックスを含む、請求項1に記載の射出成形用樹脂組成物。
- さらに、前記ワックス(a)の融点以上の融点を有するワックス(b)を少なくとも1種含む、請求項1または2に記載の射出成形用樹脂組成物。
- シリンダーおよび前記シリンダーに挿入されたスクリューからなる射出ユニットと、
当該射出ユニットから溶融組成物が充填されるキャビティを有する金型と、
を備える射出成形装置に用いられる射出成形用樹脂組成物であって、
前記シリンダー内の前記スクリュー先端の温度Tは60~100℃であり、
前記ワックスは、前記スクリュー先端の温度Tを超える融点を有するワックス(b)と、前記スクリュー先端の温度T未満の融点を有するワックス(a)とを含む、請求項1~3のいずれかに記載の射出成形用樹脂組成物。 - 前記キャビティ内の温度は150~160℃である、請求項4に記載の射出成形用樹脂組成物。
- 軟化点80℃未満のエポキシ樹脂、または軟化点80℃未満の硬化剤を含む、請求項1~5のいずれかに記載の射出成形用樹脂組成物。
- シリンダーおよび前記シリンダーに挿入されたスクリューからなる射出ユニットと、
キャビティを有する金型と、
を備える、射出成形装置を用いた射出成形方法であって、
前記シリンダー内で、請求項1~6のいずれかに記載の射出成形用樹脂組成物を溶融する工程と、
前記スクリューを用いて溶融樹脂組成物を射出し、前記キャビティ内に充填する工程と、
を含む、射出成形方法。 - 前記シリンダー内の前記スクリュー先端の温度Tは60~100℃である、請求項7に記載の射出成形方法。
- 前記キャビティ内の温度は150~160℃である、請求項7または8に記載の射出成形方法。
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JP (1) | JPWO2023149221A1 (ja) |
KR (1) | KR20240137693A (ja) |
CN (1) | CN118632902A (ja) |
WO (1) | WO2023149221A1 (ja) |
Citations (6)
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JPH0867741A (ja) | 1994-08-30 | 1996-03-12 | Sumitomo Bakelite Co Ltd | エポキシ樹脂組成物 |
JP2013127042A (ja) | 2011-12-19 | 2013-06-27 | Nippon Steel & Sumikin Chemical Co Ltd | エポキシ樹脂射出成型材料 |
JP2014051537A (ja) * | 2012-09-05 | 2014-03-20 | Mitsubishi Pencil Co Ltd | 熱変色固形描画材セット |
JP2020132647A (ja) * | 2019-02-12 | 2020-08-31 | 住友ベークライト株式会社 | Ldsに用いる射出成形用熱硬化性樹脂成形材料、それを用いた射出成形品の製造方法およびmidの製造方法 |
JP2021134366A (ja) * | 2020-02-24 | 2021-09-13 | 合同会社モルージ | 金属粉末成形用組成物 |
JP2022017406A (ja) | 2016-06-24 | 2022-01-25 | アークサーダ,エルエルシー | 第4級アンモニウム殺生物剤を含む相乗的抗微生物剤組合せ |
Family Cites Families (3)
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JPH08170009A (ja) * | 1994-12-19 | 1996-07-02 | Mitsubishi Chem Corp | 射出成形用ポリエチレンテレフタレート系樹脂組成物及び大型射出成形品 |
EP2181155B1 (en) * | 2007-08-22 | 2011-01-19 | Basell Poliolefine Italia S.R.L. | Soft polyolefin compositions with improved processability |
JP2009120714A (ja) * | 2007-11-14 | 2009-06-04 | Idemitsu Kosan Co Ltd | 複合樹脂ペレット、成形品、および、複合樹脂ペレットの製造方法 |
-
2023
- 2023-01-19 JP JP2023549634A patent/JPWO2023149221A1/ja active Pending
- 2023-01-19 WO PCT/JP2023/001546 patent/WO2023149221A1/ja active Application Filing
- 2023-01-19 KR KR1020247029427A patent/KR20240137693A/ko unknown
- 2023-01-19 CN CN202380019205.1A patent/CN118632902A/zh active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0867741A (ja) | 1994-08-30 | 1996-03-12 | Sumitomo Bakelite Co Ltd | エポキシ樹脂組成物 |
JP2013127042A (ja) | 2011-12-19 | 2013-06-27 | Nippon Steel & Sumikin Chemical Co Ltd | エポキシ樹脂射出成型材料 |
JP2014051537A (ja) * | 2012-09-05 | 2014-03-20 | Mitsubishi Pencil Co Ltd | 熱変色固形描画材セット |
JP2022017406A (ja) | 2016-06-24 | 2022-01-25 | アークサーダ,エルエルシー | 第4級アンモニウム殺生物剤を含む相乗的抗微生物剤組合せ |
JP2020132647A (ja) * | 2019-02-12 | 2020-08-31 | 住友ベークライト株式会社 | Ldsに用いる射出成形用熱硬化性樹脂成形材料、それを用いた射出成形品の製造方法およびmidの製造方法 |
JP2021134366A (ja) * | 2020-02-24 | 2021-09-13 | 合同会社モルージ | 金属粉末成形用組成物 |
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KR20240137693A (ko) | 2024-09-20 |
CN118632902A (zh) | 2024-09-10 |
JPWO2023149221A1 (ja) | 2023-08-10 |
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