WO2025204594A1 - 発泡成形用樹脂組成物、発泡成形体及び発泡成形体の製造方法 - Google Patents
発泡成形用樹脂組成物、発泡成形体及び発泡成形体の製造方法Info
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- WO2025204594A1 WO2025204594A1 PCT/JP2025/007779 JP2025007779W WO2025204594A1 WO 2025204594 A1 WO2025204594 A1 WO 2025204594A1 JP 2025007779 W JP2025007779 W JP 2025007779W WO 2025204594 A1 WO2025204594 A1 WO 2025204594A1
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- Prior art keywords
- resin composition
- foam
- fluororesin
- foam molding
- compound
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- 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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
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- 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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0014—Use of organic additives
- C08J9/0028—Use of organic additives containing nitrogen
-
- 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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0014—Use of organic additives
- C08J9/0052—Organo-metallic compounds
-
- 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
- C08J2327/00—Characterised by the use 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 a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use 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 a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/12—Characterised by the use 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 a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene
-
- 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
- C08J2327/00—Characterised by the use 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 a halogen; Derivatives of such polymers
- C08J2327/22—Characterised by the use 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 a halogen; Derivatives of such polymers modified by chemical after-treatment
- C08J2327/24—Characterised by the use 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 a halogen; Derivatives of such polymers modified by chemical after-treatment halogenated
Definitions
- This disclosure relates to a resin composition for foam molding, a foam molded article, and a method for producing a foam molded article.
- the present disclosure (6) is a resin composition for foam molding according to any one of the present disclosures (1) to (5), in which the content of the fluororesin (A) is 80 to 99.99 mass%.
- the present disclosure (20) is a method for producing a foam molded article according to the present disclosure (19), in which the foam molding is batch foam molding.
- the resin composition for foam molding of the present disclosure contains a fluororesin (A) and a compound (B) having a crystallite size of greater than 100 ⁇ as measured by X-ray diffraction and a volatilization amount of 7.0% by mass or less at 330°C, and the compound (B) is dispersed in the fluororesin (A) with a center-of-gravity distance of 5.0 ⁇ m or less.
- compound (B) that satisfies the above-mentioned conditions functions as a foam nucleating agent.
- the crystallite size is greater than 100 ⁇ and the center-of-gravity distance is 5.0 ⁇ m or less, the bubble size in the foam molded article is reduced, allowing for an increased number of bubbles to be generated.
- the volatilization amount at 330°C is 7.0 mass% or less, bubble coalescence can be suppressed.
- the fluororesin (A) may be any resin containing fluorine, but is preferably a melt-processable fluororesin.
- melt-processable fluororesins include tetrafluoroethylene (TFE)/hexafluoropropylene (HFP) copolymers [FEP], TFE/perfluoro(alkyl vinyl ether) (PAVE) copolymers [PFA], TFE/ethylene copolymers [ETFE], chlorotrifluoroethylene (CTFE)/ethylene copolymers [ECTFE], polyvinylidene fluoride [PVdF], polychlorotrifluoroethylene [PCTFE], TFE/vinylidene fluoride (VdF) copolymers [VT], polyvinyl fluoride [PVF], TFE/VdF/CTFE copolymers [VTC], TFE/ethylene/HFP copolymers, and TFE/HFP/VdF copolymers. These may be used alone or in combination
- PAVE perfluoro(methyl vinyl ether) [PMVE], perfluoro(ethyl vinyl ether) [PEVE], and perfluoro(propyl vinyl ether) [PPVE]. Of these, PPVE is preferred. These can be used alone or in combination of two or more.
- Fluororesin (A) may contain polymerization units based on other monomers in an amount that does not impair the essential properties of each fluororesin.
- examples of other monomers include TFE, HFP, ethylene, propylene, perfluoro(alkyl vinyl ether), perfluoroalkylethylene, hydrofluoroolefin, fluoroalkylethylene, and perfluoro(alkyl allyl ether). These may be used alone or in combination.
- the perfluoroalkyl group constituting the other monomer preferably has 1 to 10 carbon atoms.
- the other monomer may be a monomer having a polar group.
- the monomer having a polar group include non-fluorine-containing monomers having a hydroxyl group, such as hydroxyalkyl vinyl ethers such as hydroxyethyl vinyl ether, hydroxypropyl vinyl ether, hydroxybutyl vinyl ether, hydroxyisobutyl vinyl ether, and hydroxycyclohexyl vinyl ether; non-fluorine-containing monomers having a carboxyl group, such as acrylic acid, methacrylic acid, itaconic acid, succinic acid, fumaric acid, crotonic acid, maleic acid, citraconic acid, undecylenic acid, and acetylenedicarboxylic acid; itaconic anhydride (hereinafter also referred to as "IAH”), citraconic anhydride (hereinafter also referred to as "CAH”), 5-norbornene-2, Examples include non-fluorine-containing monomers having an acid an
- the fluororesin (A) is preferably at least one selected from the group consisting of TFE/HFP copolymers and TFE/PAVE copolymers, and more preferably a TFE/HFP copolymer. Also preferred is a perfluororesin because it has better electrical properties.
- the TFE/HFP copolymer preferably has a mass ratio of TFE/HFP of 80-97/3-20, more preferably 84-92/8-16.
- the TFE/HFP copolymer may be a binary copolymer composed of TFE and HFP, or may be a terpolymer composed of TFE and a comonomer copolymerizable with HFP (for example, a TFE/HFP/PAVE copolymer).
- the TFE/HFP copolymer is also preferably a TFE/HFP/PAVE copolymer containing polymerized units based on PAVE.
- the TFE/HFP/PAVE copolymer preferably has a mass ratio of TFE/HFP/PAVE of 70-97/3-20/0.1-10, more preferably 81-92/5-16/0.3-5.
- the TFE/PAVE copolymer preferably has a mass ratio of TFE/PAVE of 90-99/1-10, and more preferably 92-97/3-8.
- the TFE/ethylene copolymer preferably has a TFE/ethylene molar ratio of 20 to 80/20 to 80, more preferably 40 to 65/35 to 60.
- the TFE/ethylene copolymer may also contain other monomer components. That is, the TFE/ethylene copolymer may be a binary copolymer consisting of TFE and ethylene, or may be a ternary copolymer consisting of TFE and a comonomer copolymerizable with ethylene (for example, a TFE/ethylene/HFP copolymer).
- the TFE/ethylene copolymer is also preferably a TFE/ethylene/HFP copolymer containing polymerization units based on HFP.
- the TFE/ethylene/HFP copolymer preferably has a TFE/ethylene/HFP molar ratio of 40-65/30-60/0.5-20, more preferably 40-65/30-60/0.5-10.
- melt-moldable preferably means that the melt flow rate (MFR) is 1 to 100 g/10 min.
- MFR of the fluororesin (A) is more preferably 5 to 70 g/10 min, even more preferably 10 to 60 g/10 min, and further more preferably 15 to 50 g/10 min, even more preferably 20 to 45 g/10 min, and particularly preferably 30 to 45 g/10 min, because this can suppress the generation of sparks and increase the foaming rate.
- the MFR is a value measured in accordance with ASTM D-1238 using a die having a diameter of 2.1 mm and a length of 8 mm at 372° C. under a load of 5 kg.
- the fluororesin (A) may contain a fluororesin that is not melt-moldable in addition to a melt-moldable fluororesin.
- the fluororesin (A) contains a fluororesin that is not melt-moldable, the content thereof is preferably 0.001 to 3.0 mass% based on the total amount of the fluororesin (A).
- not melt-moldable means that the MFR is less than 1 g/10 min, and preferably 0.1 g/10 min or less.
- FEP and the like are fluororesins that cannot be melt-molded when their MFR is less than 1 g/10 min, and are fluororesins that can be melt-molded when their MFR is 1 g/10 min or more.
- PTFE may be a tetrafluoroethylene [TFE] homopolymer, or may be a modified polytetrafluoroethylene [modified PTFE] obtained from TFE and a minor comonomer.
- TFE homopolymer is obtained by polymerizing only tetrafluoroethylene (TFE) as monomer.
- TFE tetrafluoroethylene
- the minor comonomer in modified PTFE is not particularly limited as long as it can be copolymerized with TFE and fluorine-containing compound, and for example, can be listed as perfluoroolefin such as hexafluoropropene (HFP); the perfluorovinyl ether (PFVE) such as the various PAVEs mentioned above; fluorodioxole etc.; trifluoroethylene; vinylidene fluoride etc.
- the content of the minor monomer units derived from the minor monomers in the total monomer units is usually in the range of 0.001 to 1.0% by mass.
- the “content (% by mass) of minor monomer units in all monomer units” means the mass fraction (% by mass) of the minor monomers from which the minor monomer units are derived in the monomers from which the "total monomer units” are derived, i.e., in the total amount of monomers constituting the fluoropolymer.
- the standard specific gravity [SSG] of PTFE is preferably 2.15 to 2.30, more preferably 2.25 or less, and even more preferably 2.22 or less.
- High molecular weight PTFE with an SSG of less than 2.15 does not eliminate the effects of the present disclosure, but is difficult to manufacture and is therefore impractical.
- the SSG is a value measured by the immersion method in accordance with ASTM D4895-89. When the SSG of PTFE is low, the effect of increasing the biaxial elongational viscosity can be achieved by adding a small amount, and when the SSG is high, the effect can be achieved by adding a larger amount.
- PTFE can be prepared by known methods such as emulsion polymerization and suspension polymerization, but emulsion polymerization is preferred as the polymerization method. If PTFE aggregates are present in the resin composition for foam molding of the present disclosure, spark outs may occur frequently during wire coating molding, increasing the defect rate. Therefore, the average primary particle size of PTFE is preferably 50 to 800 nm, and more preferably 50 to 500 nm.
- the average primary particle diameter of PTFE was determined by measuring the transmittance of projected light with a wavelength of 500 nm per unit length for a polymer latex diluted with water to a solid content of 0.22% by mass, and based on a calibration curve of the number-average primary particle diameter of PTFE obtained by measuring the unidirectional diameter in a transmission electron microscope photograph in advance and the transmittance.
- Fluororesin (A) can be synthesized by polymerizing the monomer components using a conventional polymerization method, such as emulsion polymerization, suspension polymerization, solution polymerization, bulk polymerization, or gas phase polymerization.
- a chain transfer agent such as methanol may be used in the polymerization reaction.
- Fluororesin (A) may also be produced by polymerization and isolation without using a metal ion-containing reagent.
- the fluororesin (A) is not particularly limited, but may have a terminal group such as —CF 3 or —CF 2 H at at least one site of the polymer main chain or the polymer side chain, and preferably has a —CF 3 terminal group. Fluororesins having such terminal groups can be obtained by fluorination treatment. Fluororesins that have not been fluorinated may have thermally and electrically unstable terminal groups such as -COOH, -CH 2 OH, -COF, and -CONH 2 (hereinafter, such terminal groups will also be referred to as "unstable terminal groups"). Such unstable terminal groups can be reduced by the fluorination treatment.
- the compound (B) has a crystallite size of more than 100 ⁇ as measured by X-ray diffraction (XRD), preferably more than 140 ⁇ , and more preferably more than 200 ⁇ . This allows for the formation of an ideal crystal lattice with little distortion, which promotes bubble formation.
- the upper limit of the crystallite size is preferably 10,000 ⁇ or less, more preferably 5,000 ⁇ or less, and even more preferably 1,000 ⁇ or less.
- XRD is performed using an X-ray diffractometer (Smart Lab, manufactured by Rigaku Corporation) and measurement and analysis software (Smart Lab Studio II). The powder is measured using CuK ⁇ with a wavelength of 1.54 ⁇ as the X-ray source, and the diffraction angle (2 ⁇ ) is 5° to 90°.
- compound (B) does not decompose and is insoluble or not melted in fluororesin (A) at the molding temperature during foam molding. That is, compound (B) is preferably solid in the foam molding resin composition of the present disclosure when the composition is foam molded. This allows compound (B) to fully function as a foam nucleating agent. Whether compound (B) satisfies this condition can be confirmed by observing, using a polarizing microscope equipped with a hot stage, whether compound (B) remains solid when heated to a predetermined temperature.
- the melting temperature (melting point) of compound (B) is preferably 300°C or higher, more preferably 320°C or higher, and even more preferably 350°C or higher. Within this range, the compound is less likely to melt even at the molding temperature during foam molding, and can fully function as a foam nucleating agent. There is no particular upper limit, but 1000°C or lower is preferred.
- the thermal decomposition temperature of compound (B) is preferably 270°C or higher, more preferably 320°C or higher, and even more preferably 350°C or higher. Within this range, compound (B) is less likely to decompose even at the molding temperature during foam molding. Therefore, adverse effects caused by the decomposition of compound (B) (e.g., deterioration of electrical properties, bursting of cells, and breakage of the coating during wire molding) can be suppressed. There is no particular upper limit, but a temperature of 1000°C or lower is preferred.
- the melting temperature (melting point) and thermal decomposition temperature of compound (B) can be measured in the same manner as for fluororesin (A) described above.
- the content of compound (B) is preferably 0.1 part by mass or more, more preferably 0.3 part by mass or more, even more preferably 0.5 part by mass or more, and is preferably 20 parts by mass or less, more preferably 5.0 parts by mass or less, even more preferably 2.0 parts by mass or less, per 100 parts by mass of fluororesin (A). If the content of compound (B) is too low, the effect of adding compound (B) may not be fully achieved, and if the content is too high, production costs may increase.
- sulfonic acid examples include sulfonic acid, sulfonates, phosphonic acid, phosphonates, zeolites, ADCA (azodicarbonamide), DPT (N,N'-dinitropentamethylenetetramine), and OBSH (4,4'-oxybisbenzenesulfonylhydrazide). These can be used alone or in combination of two or more.
- the resin composition for foam molding of the present disclosure may further contain a polyatomic anion-containing inorganic salt, as long as the effects of the present disclosure are not impaired.
- Polyatomic anion-containing inorganic salts include those disclosed in US Pat. No. 4,764,538.
- the resin composition for foam molding of the present disclosure may contain conventionally known fillers as long as the effects of the present disclosure are not impaired.
- fillers include graphite, carbon fiber, coke, silica, zinc oxide, magnesium oxide, magnesium sulfate, tin oxide, antimony oxide, calcium carbonate, magnesium carbonate, magnesium hydroxide, glass, talc, mica, aluminum nitride, calcium phosphate, sericite, diatomaceous earth, silicon nitride, fine silica, fumed silica, alumina, zirconia, quartz powder, kaolin, bentonite, and titanium oxide. These may be used alone or in combination.
- the shape of the filler is not particularly limited, and examples include fibrous, needle-like, columnar, whisker-like, plate-like, layered, scaly, balloon-like, porous, chopped fiber, powder, granular, and bead-like shapes. Note that fillers are different from the boron nitride and other foam nucleating agents mentioned above.
- the resin composition for foam molding of the present disclosure may further contain other components such as additives.
- additives include fillers such as glass fiber, glass powder, asbestos fiber, cellulose fiber, and carbon fiber, as well as reinforcing agents, stabilizers, lubricants, pigments, flame retardants, and other additives.
- the resin composition for foam molding of the present disclosure is substantially free of a fluorine-based low molecular weight compound.
- substantially free of fluorine-based low molecular weight compounds means that the content of fluorine-based low molecular weight compounds is 10 ppm by mass or less.
- the fluorine-based low molecular weight compound is not particularly limited, and examples thereof include fluorine-based compounds having a molecular weight of 1,000 or less.
- Specific examples include perfluoroalkyl acids and perfluorosulfonic acids, more specific examples include C8F17COOH and salts thereof, C7F15COOH and salts thereof , C6F13COOH and salts thereof, C8F17SO3H and salts thereof, C6F13SO3H and salts thereof , C4F9SO3H and salts thereof, C8F17CH2CH2 - SO3H and salts thereof , C6F13CH2CH2 - SO3H and salts thereof , C8F17CH2CH2OH , C6F13CH2CH2OH , and more specific examples include ⁇ F ( CF2 ) 6CH2CH2SO3 ⁇ 2 Examples include Ba.
- the content of fluorine-based low molecular weight compounds can be analyzed by the following method: The sample is pulverized by freeze-pulverization, the resulting powder is dispersed in methanol, and extracted by applying ultrasonic waves at 60°C for 2 hours. The extract is quantified using a liquid chromatograph-mass spectrometer (LC-MS/MS), and the content is recorded as the value.
- LC-MS/MS liquid chromatograph-mass spectrometer
- the melt flow rate (MFR) of the resin composition for foam molding of the present disclosure is preferably 1 to 100 g/10 min, more preferably 5 to 70 g/10 min, and even more preferably 10 to 60 g/10 min, and is even more preferably 15 to 50 g/10 min, even more preferably 20 to 45 g/10 min, and particularly preferably 30 to 45 g/10 min, because this can suppress the generation of sparks and increase the foaming rate.
- the MFR is a value measured in accordance with ASTM D-1238 using a die having a diameter of 2.1 mm and a length of 8 mm, under a load of 5 kg, and at 372°C.
- the dielectric constant of the resin composition for foam molding of the present disclosure is preferably 3.0 or less, more preferably 2.5 or less, even more preferably 2.3 or less, and most preferably 2.1 or less.
- the lower limit is 1.0 or more.
- the dielectric loss tangent is preferably 0.01 or less, more preferably 0.002 or less, even more preferably 0.001 or less, and most preferably 0.0005 or less.
- the lower limit is 0.0001 or more.
- the dielectric constant and dielectric loss tangent of the resin composition for foam molding of the present disclosure are measured by a cavity resonator method at a frequency of 6 GHz using the resin composition before foam molding.
- the foam molding resin composition of the present disclosure can be suitably used as a foamable composition, and in particular, can be suitably used as a wire coating composition for forming a coating layer on an electric wire.
- the method for producing a foam-molded article of the present disclosure includes a step of foam-molding (preferably batch foam-molding) the resin composition for foam molding of the present disclosure.
- the foam-molded article of the present disclosure is formed using the foam-molding resin composition of the present disclosure.
- foam nucleating agents capable of forming fine bubbles have not been common in batch foam molding of fluororesins, which requires molding at high temperatures.
- the foam molding resin composition of the present disclosure is capable of forming fine bubbles even in batch foam molding of fluororesins.
- the gas used in the gas extrusion method and batch foaming method can be, for example, chlorodifluoromethane, nitrogen, carbon dioxide, or a mixture of these gases. It can be introduced as a pressurized gas into the molten resin in the extruder or into a pressure-resistant vessel, or it can be generated by mixing a chemical foaming agent into the molten resin or a preformed resin composition for foam molding. The introduced gas dissolves in the molten resin in the extruder and in the resin in the pressure vessel.
- Gases dissolved in the resin are released from the melt when the melt pressure suddenly drops as it exits the extrusion die, or when the pressure in the pressure vessel is released and the pressure is rapidly reduced.
- the extrudate that leaves the extruder is then cooled and solidified, for example by immersing it in water.
- the resin is also cooled and solidified by cooling the pressure vessel.
- the foam molded article of the present disclosure has a low dielectric constant, exhibits stable capacitance, and is lightweight, allowing it to be used as a coating material (described below) with stable dimensions such as wire diameter and thickness, and can also be used as an insulating layer with stable dimensions such as thickness.
- the total volume of bubbles in the foamed molded article of the present disclosure can be adjusted appropriately depending on the application, for example, by adjusting the amount of gas introduced into the extruder or by selecting the type of gas to be dissolved.
- the shape of the foam molded article of the present disclosure is not particularly limited, and can be various shapes such as a covering material for foam electric wires or the like; a filament-like shape for wires or the like; a sheet-like shape; a film-like shape; a rod-like shape; a pipe-like shape; etc.
- the foam molded article can be used as, for example, an electrical insulating material; a heat insulating material; a sound insulating material; a lightweight structural material such as a floating material; a buffer material such as a cushion; etc.
- the foam molded article can be particularly suitably used as a covering material for foam electric wires.
- the foamed molded article of the present disclosure is in a foamed state that is advantageous for achieving a low dielectric constant, and therefore can be used for interrelated insulators such as insulating layers for electric wires, insulating layers for semiconductor package substrates, insulating layers for transformers, insulating layers for circuit boards, insulating layers for motors, insulating layers for reactors, insulating layers for transistors, insulating layers for printed circuit boards, insulating layers for semiconductor devices, and insulating layers for electronic components, and is particularly suitable for use as insulating layers (coating layers) for electric wires.
- interrelated insulators such as insulating layers for electric wires, insulating layers for semiconductor package substrates, insulating layers for transformers, insulating layers for circuit boards, insulating layers for motors, insulating layers for reactors, insulating layers for transistors, insulating layers for printed circuit boards, insulating layers for semiconductor devices, and insulating layers for electronic components, and is particularly suitable for use as insul
- the various properties in this specification were measured by the following methods.
- the pellets were rolled using a hydraulic press to prepare a film with a thickness of about 0.3 mm, and the film was analyzed using an FT-IR Spectrometer 1760X (manufactured by Perkin-Elmer).
- Number of unstable terminal groups per 1 ⁇ 10 6 carbon atoms (I ⁇ K) / t (I: absorbance, K: correction factor, t: film thickness (unit: mm))
- the correction coefficient (K) for each unstable terminal group is as follows: -COF (1884cm -1 )...405 -COOH (1813cm -1 , 1775cm -1 )...455 -COOCH 3 (1795cm -1 )...355 -CONH 2 (3438cm -1 )...480 -CH 2 OH (3648 cm -1 )...2325
- the melting point was determined as the temperature corresponding to the peak when measured using a DSC (RDC220 manufactured by Seiko Denshi Co., Ltd.) at a temperature rise rate of 10° C./min.
- MFR Melt Indexer Series 4000 (manufactured by Yasuda Seiki Co., Ltd.) with a die having a diameter of 2.1 mm and a length of 8 mm at 372° C. under a load of 5 kg.
- Step 1 Preparation of pellets for batch foaming test (step 1)) Additives were mixed with FEP pellets (MFR: 38 g/10 min) to achieve the desired concentration, and the mixture was kneaded in a Labo Plastomill at 300°C for 10 minutes to produce a compound. The recovered compound was cut and extruded using an MFR measuring device at 300°C under a 5 kg load, and the extruded strands were cut into 2-3 mm pieces to produce pellets. The cross section of the prepared pellet was photographed at 150x magnification using a laser microscope (Keyence Corporation, Shape Analysis Laser Microscope (VK-X1000)), and the distance between the centers of gravity of the nucleating agent particles, particle density, and particle diameter were calculated by image processing. The distance between the centers of gravity and particle diameter were taken as the average values of 100 particles.
- FEP pellets MFR: 38 g/10 min
- Step 2 Batch foaming test (step 2)) 0.4 g of pellets wrapped in aluminum foil were placed in a pressure vessel with an internal volume of approximately 11 cm3 that had been thoroughly preheated in an electric furnace at 270°C, and the vessel was returned to the electric furnace. Up to three samples were placed simultaneously in each test. The vessel was pressurized to 3 MPa with nitrogen gas, held for 60 minutes, and then rapidly depressurized to atmospheric pressure within 1 second to foam the resin. The resulting foamed molded article maintained its pellet shape. Furthermore, it was not in an unfoamed state (a state in which only cracks had occurred). The cross section of the foamed molded article was photographed using an SEM, and the number of bubbles per unit area was calculated by image processing.
- the ratio of the number of bubbles generated when a similar process was performed on a resin without additives was used as the bubble number index per unit area.
- the average area per unit bubble was calculated, and the ratio of the area of bubbles generated when a similar process was performed on a resin without additives was used as the average bubble area index.
- volatility test The sample (additive) was kept in an electric furnace at 330° C. for 1 hour, and the mass loss was measured. The amount of volatilization was calculated by dividing the mass before keeping by 100.
- Example 1 In step 1, 1 part by mass of copper phthalocyanine (manufactured by Tokyo Chemical Industry Co., Ltd., melting point: no peak detected below 350°C, thermal decomposition temperature: 388°C, crystallite size: 103 ⁇ , amount of volatilization in volatility test: 0.4% by mass) was added to 100 parts by mass of FEP pellets to prepare pellets, and in step 2, a foamed molded product was obtained.
- the distance between the centers of gravity of the additive particles dispersed in the pellets prepared in step 1 was 1.6 ⁇ m.
- the bubble number index per unit area in the batch foaming test in step 2 was a good 21.
- Example 2 A foamed molded article was obtained in the same manner as in Example 1, except that a Shirasu balloon (SSW-40 manufactured by Zanwards Corporation, main components: silicon dioxide and aluminum oxide, melting point: no peak detected below 350°C, thermal decomposition temperature: 600°C or higher, crystallite size: 672 ⁇ , amount of volatilization in volatility test: 0.0%) was used as the additive.
- the distance between the centers of gravity of the additive particles dispersed in the pellets produced in step 1 was 2.9 ⁇ m.
- the bubble number index per unit area in the batch foaming test in step 2 was a good 13. Furthermore, at the molding temperature during foam molding, the Shirasu balloon did not decompose, was insoluble in FEP, and did not melt.
- Example 3 A foamed molded article was obtained in the same manner as in Example 1, except that precipitated barium sulfate (P-30 manufactured by Takehara Chemical Industry Co., Ltd., melting point: no peak detected below 350°C, thermal decomposition temperature: 600°C or higher, crystallite size: 309 ⁇ , amount of volatilization in volatility test: 0.0%) was used as the additive.
- the distance between the centers of gravity of the additive particles dispersed in the pellets produced in step 1 was 2.8 ⁇ m.
- the bubble number index per unit area in the batch foaming test in step 2 was a good 13. Furthermore, at the molding temperature during foam molding, the precipitated barium sulfate did not decompose and was insoluble and not melted in FEP.
- Example 4 A foamed molded article was obtained in the same manner as in Example 1, except that parite powder (W-6 manufactured by Takehara Chemical Industry Co., Ltd., main component: barium sulfate, melting point: no peak detected below 350°C, thermal decomposition temperature: 600°C or higher, crystallite size: 153 ⁇ , volatilization amount in volatility test: 0.0%) was used as the additive.
- the distance between the centers of gravity of the additive particles dispersed in the pellets produced in step 1 was 2.9 ⁇ m.
- the bubble number index per unit area in the batch foaming test in step 2 was a good 12. Furthermore, at the molding temperature during foam molding, the pearlite powder did not decompose, was insoluble in FEP, and did not melt.
- Comparative Example 1 A foamed molded article was obtained in the same manner as in Example 1, except that boron nitride (MGP manufactured by Denka Co., Ltd., crystallite size: 158 ⁇ , volatilization amount in volatility test: 0.0%) was used as the additive.
- the distance between the centers of gravity of the additive particles dispersed in the pellets produced in step 1 was 5.9 ⁇ m.
- the bubble number index per unit area in the batch foaming test in step 2 was a small 7.3.
- Comparative Example 2 A foamed molded article was obtained in the same manner as in Example 1, except that sodium benzoate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., crystallite size: 131 ⁇ , volatilization amount in volatility test: 0.0%) was used as the additive.
- the distance between the centers of gravity of the additive particles dispersed in the pellets produced in step 1 was 6.2 ⁇ m.
- the bubble number index per unit area in the batch foaming test was a small 5.4.
- Comparative Example 5 A foamed molded article was obtained in the same manner as in Example 1, except that a rosin metal salt (Plafit H510H manufactured by Arakawa Chemical Industries, Ltd., no peaks were observed by XRD, and the amount of volatilization in the volatility test was 10.6% by mass) was used as the additive.
- the distance between the centers of gravity of the additive particles dispersed in the pellets produced in Step 1 was 4.2 ⁇ m.
- the bubble count index per unit area in the batch foaming test in Step 2 was a small 0.4.
- Comparative Example 6 A foamed molded article was obtained in the same manner as in Example 1, except that a condensed phosphate ester (SR-3000 manufactured by Daihachi Chemical Industry Co., Ltd., no peaks were observed by XRD, and the amount of volatilization in the volatility test was 8.1% by mass) was used as the additive.
- the distance between the centers of gravity of the additive particles dispersed in the pellets produced in step 1 was 4.1 ⁇ m.
- the bubble count index per unit area in the batch foaming test in step 2 was a small 0.2.
- Example 7 Except for not using any additives, a foamed molded article was obtained in the same manner as in Example 1. In a batch foaming test using this foamed molded article, the bubble number index per unit area was set to 1.0 and the average bubble area index was set to 1.00.
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Abstract
Description
TFE/HFP系共重合体は、TFEとHFPとからなる2元共重合体であってもよいし、更に、TFE及びHFPと共重合可能なコモノマーからなる3元共重合体(例えば、TFE/HFP/PAVE共重合体)であってもよい。
TFE/HFP系共重合体は、PAVEに基づく重合単位を含むTFE/HFP/PAVE共重合体であることも好ましい。
TFE/HFP/PAVE共重合体は、TFE/HFP/PAVEが質量比で、70~97/3~20/0.1~10であることが好ましく、81~92/5~16/0.3~5であることがより好ましい。
すなわち、TFE/エチレン系共重合体は、TFEとエチレンとからなる2元共重合体であってもよいし、更に、TFE及びエチレンと共重合可能なコモノマーからなる3元共重合体(例えば、TFE/エチレン/HFP共重合体)であってもよい。
TFE/エチレン系共重合体は、HFPに基づく重合単位を含むTFE/エチレン/HFP共重合体であることも好ましい。TFE/エチレン/HFP共重合体は、TFE/エチレン/HFPがモル比で、40~65/30~60/0.5~20であることが好ましく、40~65/30~60/0.5~10であることがより好ましい。
上記MFRは、ASTM D-1238に準拠して、直径2.1mmで長さが8mmのダイで、372℃、5kg荷重にて測定した値である。
なお、本明細書において、溶融成形できないとは、上記MFRが1g/10分未満であることを意味する。上記MFRは、0.1g/10分以下であることが好ましい。
なお、FEP等は、MFRが1g/10分未満の場合は溶融成形できないフッ素樹脂、MFRが1g/10分以上の場合は溶融成形可能なフッ素樹脂とする。
TFEホモポリマーは、モノマーとしてテトラフルオロエチレン〔TFE〕のみを重合することにより得られるものである。変性PTFEにおける微量共単量体としては、TFEとの共重合が可能な含フッ素化合物であれば特に限定されず、例えば、ヘキサフルオロプロペン〔HFP〕等のパーフルオロオレフィン;上述した各種PAVE等のパーフルオロビニルエーテル〔PFVE〕;フルオロジオキソール等;三フッ化エチレン;フッ化ビニリデン等が挙げられる。
変性PTFEにおいて、上記微量単量体に由来する微量単量体単位の全単量体単位に占める含有率は、通常0.001~1.0質量%の範囲である。
本明細書において、「全単量体単位に占める微量単量体単位の含有率(質量%)」とは、「全単量体単位」が由来する単量体、即ち、含フッ素ポリマーを構成することとなった単量体全量に占める、上記微量単量体単位が由来する微量単量体の質量分率(質量%)を意味する。
SSGが2.15より小さい高分子量のPTFEは、本開示の効果を排除するものではないが、製造上困難であり実際的でない。
SSGは、ASTM D4895-89に準拠して、水中置換法に基づき測定した値である。
PTFEのSSGが低い場合には、2軸伸長粘度を高める効果を少量の添加量により発揮することができる。SSGが高い場合には、添加量を多くすることで上記効果を発現させることが可能となる。
本開示の発泡成形用樹脂組成物中にPTFEの凝集物が存在する場合には電線被覆成形中にスパークアウトが頻繁に発生し不良率を悪化させるおそれがある。従って、PTFEの平均一次粒子径は、50~800nmであることが好ましく、50~500nmであることがより好ましい。
PTFEの平均一次粒子径は、固形分0.22質量%となるように水で希釈したポリマーラテックスについて、単位長さに対する波長500nmの投射光の透過率を測定し、予め透過型電子顕微鏡写真における定方向径を測定して得たPTFE数基準長さ平均一次粒子径と上記透過率との検量線に基づいて決定したものである。
フッ素化処理されていないフッ素樹脂は、-COOH、-CH2OH、-COF、-CONH2等の熱的及び電気特性的に不安定な末端基(以下、このような末端基を「不安定末端基」ともいう。)を有する場合がある。このような不安定末端基は、上記フッ素化処理により低減することができる。フッ素樹脂(A)は、上記不安定末端基が少ないか又は含まないことが好ましく、上記4種の不安定末端基と-CF2H末端基とを合計した数が、炭素数1×106個あたり50個以下であることがより好ましい。50個を超えると、成形不良が生じるおそれがある。上記不安定末端基は、20個以下であることがより好ましく、10個以下であることが更に好ましい。
本明細書において、上記不安定末端基数は赤外吸収スペクトル測定から得られた値である。上記不安定末端基および-CF2H末端基が存在せず全て-CF3末端基であってもよい。
フッ素含有化合物としては特に限定されないが、フッ素化処理条件下にてフッ素ラジカルを発生するフッ素ラジカル源が挙げられる。フッ素ラジカル源としては、F2ガス、CoF3、AgF2、UF6、OF2、N2F2、CF3OF、及び、フッ化ハロゲン(例えばIF5、ClF3)等が挙げられる。これらは1種又は2種以上を用いることができる。
F2ガス等のフッ素ラジカル源は、100%濃度のものであってもよいが、不活性ガスと混合し5~50質量%、好ましくは15~30質量%に希釈して使用することが好ましい。上記不活性ガスとしては、窒素ガス、ヘリウムガス、アルゴンガス等が挙げられるが、経済的な面より窒素ガスが好ましい。
フッ素化処理の条件は、特に限定されず、溶融させた状態のフッ素樹脂とフッ素含有化合物とを接触させてもよいが、通常、フッ素樹脂の融点以下、好ましくは20~220℃、より好ましくは100~200℃の温度下で行うことができる。フッ素化処理は、一般に1~30時間、好ましくは5~20時間行う。
フッ素化処理は、フッ素化処理されていないフッ素樹脂をフッ素ガス(F2ガス)と接触させるものが好ましい。
本明細書において、融点は示差走査熱量計(DSC)で測定される温度であり、成形温度は一般的に推奨されている成形に適した温度で、当該温度において流動性を有しかつ着色などの樹脂劣化を起こさない温度であり、熱分解温度はTG(加熱重量変化測定)により空気中で10℃/minで加熱した際の1%重量減少温度である。但し、100℃から200℃に見られる含有水や結晶水の揮発による重量減少分は除く。流動性を有するとは、当該温度においてMFRが0.0001以上であることを意味する。
XRDは、X線回折装置:(株)リガク社製Smart Lab、を用い、測定・解析ソフト:Smart Lab StudioII、にて、粉末を測定する。X線源には波長1.54ÅのCuKαを用い、回折角(2θ)は5°~90°とする。得られた回折ピークの最も大きい半値幅から、Scherrerの式を用いて結晶子サイズを算出する。
D=K×λ/(β×cosθ)・・・Scherrerの式
D:結晶子サイズ(Å)
K:Scherrer定数
λ:X線波長 (Å)
β:回折ピークの半値幅(rad)
θ:回折角の1/2 (rad)
Scherrer定数(K)=0.94、X線波長(λ)=1.5418とする。得られる回折スペクトルに結晶構造に由来する回折ピークを有しないものは、結晶構造を有しないものとする。
揮発量は、電気炉にて、330℃で1時間サンプルを保持した際の質量の減少分を測定し、質量の減少分/保持前の質量×100から算出する。
但し、成分の種類は重要ではなく、上述の条件を満たすことが重要であり、同じ成分でも結晶状態、分散状態、揮発量が異なれば同じ効果は得られない。結晶状態はX線回折法(XRD)における結晶子サイズが100Åより大きいことが重要であり、分散状態はフッ素樹脂(A)中に重心間距離5.0μm以下で分散していることが重要であり、揮発量は330℃における揮発量が、7.0質量%以下であることが重要である。
化合物(B)がこの条件を満たすことは、ホットステージを備えた偏光顕微鏡にて、所定の温度まで昇温した際に、化合物(B)が固体のままで存在するかを観察することによって確認できる。
多原子アニオン含有無機塩としては、米国特許第4,764,538号明細書に開示されているものが挙げられる。
なお、実質的にフッ素系低分子化合物を含まないとは、フッ素系低分子化合物の含有量が10質量ppm以下であることを意味する。
サンプルを凍結粉砕により粉砕し、作製した粉体をメタノール中に分散し、60℃×2時間超音波をかけて抽出する。抽出物を液体クロマトグラフー質量分析計(LC-MS/MS)にて定量した値を含有量とする。
上記MFRは、ASTM D-1238に準拠して、直径2.1mmで長さが8mmのダイにて、荷重5kg、372℃で測定した値である。
本開示の発泡成形用樹脂組成物の誘電率、誘電正接は、発泡成形前の樹脂組成物を用いて、周波数6GHzにおける空筒共振器法により測定される。
また、本開示の発泡成形体は、本開示の発泡成形用樹脂組成物を用いて形成される。
得られる発泡成形体は、本開示の発泡成形用樹脂組成物の溶融固化体及び気泡を含有するものであって、上記気泡が溶融固化体中に均一に分布しているものであることが好ましい。気泡サイズは限定されるものではないが、例えば、60μm以下であることが好ましく、30μm以下であることがより好ましい。また、気泡サイズは、0.1μm以上であることが好ましい。
独立気泡は、上述の加熱溶融成形のほか、従来公知の方法によって形成することができる。
(不安定末端基数の測定)
ペレットを油圧プレスにて圧延して厚さ0.3mm程度のフィルムを作製し、そのフィルムをFT-IR Spectrometer 1760X(Perkin-Elmer社製)により分析した。
標準サンプル(もはやスペクトルに実質的差異がみられなくなるまで充分にフッ素化したサンプル)との差スペクトルを取得し、各ピークの吸光度を読み取り、次式に従って炭素数1×106個あたりの不安定末端基の個数を算出した。
炭素数1×106個あたりの不安定末端基の個数=(I×K)/t
(I;吸光度、K;補正係数、t;フィルム厚さ(単位:mm))
各不安定末端基の補正係数(K)は、以下の通りである。
-COF(1884cm-1)・・・405
-COOH(1813cm-1、1775cm-1)・・・455
-COOCH3(1795cm-1)・・・355
-CONH2(3438cm-1)・・・480
-CH2OH(3648cm-1)・・・2325
核磁気共鳴装置AC300(Bruker-Biospin社製)を用い、測定温度をフッ素樹脂(A)の融点+20℃として19F-NMR測定を行い、-CF2H基が存在することに由来するピークの積分値と他のピークの積分値から求めた。
ASTM D4895-89に準拠して、水中置換法に基づき測定した。
DSC(セイコー電子社製のRDC220)を使用して、昇温速度10℃/分で測定したときのピークに対応する温度を融点とした。
TGにより、空気中で10℃/minで加熱した際の1%重量減少温度を測定した。
ASTM D-1238に準拠して、KAYENESS メルトインデクサー Series4000(安田精機社製)を用い、直径2.1mmで長さが8mmのダイで、372℃、5kg荷重にて測定した時の値とした。
特表2011ー514407号公報の実施例2と同様の方法で、フッ素化処理済のFEPペレットを調製した。得られたペレット(TFE/HFP/PPVE共重合体)は、TFE/HFP/PPVE=87.8/11.2/1.0(質量比)、融点:255℃、MFR:23g/10分、不安定末端基と-CF2H末端基とを合計した数:炭素数1×106個あたり3個であった。
FEPペレット(MFR:38g/10min)に対し、目的とする濃度となるよう添加剤を配合し、ラボプラストミルにて、300℃で10分間混練りしてコンパウンドを作製した。回収したコンパウンドを裁断し、MFR測定器にて300℃、5kg加重にて押し出し、押し出されたストランドを2~3mmずつカットしてペレットを作製した。
作製したペレットの断面をレーザー顕微鏡(キーエンス社 形状解析レーザー顕微鏡 (VK-X1000))にて150倍の倍率で撮影し、画像処理により核剤粒子の重心間距離、粒子密度、粒子径を算出した。重心間距離、粒子径は、100個の平均値とした。
270℃電気炉で十分に予熱した内容積が約11cm3の圧力容器に、アルミホイルに包んだペレット0.4gを封入し、電気炉に戻した。1回のテストで3サンプルまで同時に封入した。窒素ガスにて3MPaに加圧し、60分保持後、1秒以内に大気圧へ急速減圧し樹脂を発泡させた。得られた発泡成形体は、ペレット形状を維持していた。また、発泡していない状態(クラックのみが発生した状態)ではなかった。
発泡成形体の断面のSEM画像を撮影し、画像処理により、単位面積当たりの泡数を算出し、添加剤なしの樹脂に対して同様の処理を行った場合に発生した泡数に対する倍率を、単位面積当たりの泡数指数とした。また、単位泡当りの面積の平均値を算出し、添加剤なしの樹脂に対して同様の処理を行った場合に発生した泡の面積に対する倍率を平均泡面積指数とした。
X線回折装置:(株)リガク社製Smart Lab、を用い、測定・解析ソフト:Smart Lab StudioII、にて、粉末を測定した。X線源には波長1.54ÅのCuKαを用い、回折角(2θ)は5°~90°とした。得られた回折ピークの最も大きい半値幅から、Scherrerの式を用いて結晶子サイズを算出した。
D=K×λ/(β×cosθ)・・・Scherrerの式
D:結晶子サイズ(Å)
K:Scherrer定数
λ:X線波長 (Å)
β:回折ピークの半値幅(rad)
θ:回折角の1/2 (rad)
Scherrer定数(K)=0.94、X線波長(λ)=1.5418とした。得られる回折スペクトルに結晶構造に由来する回折ピークを有しないものは、結晶構造を有しないものとし、結晶子サイズはピーク無しとした。
電気炉にて、330℃で1時間サンプル(添加剤)を保持した際の質量の減少分を測定し、質量の減少分/保持前の質量×100から揮発量を算出した。
サンプルを凍結粉砕により粉砕し、作製した粉体をメタノール中に分散し、60℃×2時間超音波をかけて抽出した。抽出物を液体クロマトグラフー質量分析計(LC-MS/MS)にて定量した値を含有量とした。
目的とする添加剤濃度のバッチ発泡テスト用ペレット(発泡前の樹脂組成物)に対し、周波数6GHzにおける空筒共振器法により測定した。
ホットステージを備えた偏光顕微鏡にて、所定の温度まで昇温した際に、化合物(B)が固体のままで存在するかを観察した。
工程1により、FEPペレット100質量部に対し、1質量部の銅フタロシアニン(東京化成工業株式会社製、融点:350℃以下にピーク検出せず、熱分解温度:388℃、結晶子サイズ:103Å、揮発性テストにおける揮発量:0.4質量%)を添加したペレットを作製し、工程2により、発泡成形体を得た。工程1により作製されたペレット中に分散した添加剤粒子の重心間距離は1.6μmであった。工程2のバッチ発泡テストにおける単位面積当たりの泡数指数は21と良好であった。
また、使用したペレット、及び、作製した発泡成形体からフッ素系低分子化合物は検出されなかった。フッ素系低分子化合物は、以降の実施例、比較例においても検出されなかった。
また、発泡成形時の成形温度において、銅フタロシアニンは、分解せず、FEPに不溶かつ融解していなかった。
また、発泡成形体の断面のSEM画像より、独立気泡が形成されていることが確認できた。独立気泡は、以降の実施例、比較例においても形成されていた。
添加剤としてシラスバルーン(株式会社ザンワーズ製のSSW-40、主成分:二酸化ケイ素及び酸化アルミニウム、融点:350℃以下にピーク検出せず、熱分解温度:600℃以上、結晶子サイズ:672Å、揮発性テストにおける揮発量:0.0%)を使用した点以外は実施例1と同様の方法により、発泡成形体を得た。工程1により作製されたペレット中に分散した添加剤粒子の重心間距離は2.9μmであった。工程2のバッチ発泡テストにおける単位面積当たりの泡数指数は13と良好であった。
また、発泡成形時の成形温度において、シラスバルーンは、分解せず、FEPに不溶かつ融解していなかった。
添加剤として沈降性硫酸バリウム(竹原化学工業株式会社製のP-30、融点:350℃以下にピーク検出せず、熱分解温度:600℃以上、結晶子サイズ:309Å、揮発性テストにおける揮発量:0.0%)を使用した点以外は実施例1と同様の方法により、発泡成形体を得た。工程1により作製されたペレット中に分散した添加剤粒子の重心間距離は2.8μmであった。工程2のバッチ発泡テストにおける単位面積当たりの泡数指数は13と良好であった。
また、発泡成形時の成形温度において、沈降性硫酸バリウムは、分解せず、FEPに不溶かつ融解していなかった。
添加剤としてパライトパウダー(竹原化学工業株式会社製のW-6、主成分:硫酸バリウム、融点:350℃以下にピーク検出せず、熱分解温度:600℃以上、結晶子サイズ:153Å、揮発性テストにおける揮発量:0.0%)を使用した点以外は実施例1と同様の方法により、発泡成形体を得た。工程1により作製されたペレット中に分散した添加剤粒子の重心間距離は2.9μmであった。工程2のバッチ発泡テストにおける単位面積当たりの泡数指数は12と良好であった。
また、発泡成形時の成形温度において、パライトパウダーは、分解せず、FEPに不溶かつ融解していなかった。
添加剤として窒化ホウ素(デンカ株式会社製のMGP、結晶子サイズ:158Å、揮発性テストにおける揮発量:0.0%)を使用した点以外は実施例1と同様の方法により、発泡成形体を得た。工程1により作製されたペレット中に分散した添加剤粒子の重心間距離は5.9μmであった。工程2のバッチ発泡テストにおける単位面積当たりの泡数指数は7.3と小さかった。
添加剤として安息香酸ナトリウム(富士フイルム和光純薬株式会社製、結晶子サイズ:131Å、揮発性テストにおける揮発量:0.0%)を使用した点以外は実施例1と同様の方法により、発泡成形体を得た。工程1により作製されたペレット中に分散した添加剤粒子の重心間距離は6.2μmであった。バッチ発泡テストにおける単位面積当たりの泡数指数は5.4と小さかった。
添加剤としてピグメントレッド254(東京化成工業株式会社製、結晶子サイズ:89Å、揮発性テストにおける揮発量:0.4%)を使用した点以外は実施例1と同様の方法により、発泡成形体を得た。工程1により作製されたペレット中に分散した添加剤粒子の重心間距離は2.2μmであった。工程2のバッチ発泡テストにおける単位面積当たりの泡数指数は3.1と小さかった。
添加剤としてタルク(東京化成工業株式会社製のPAOG-2、結晶子サイズ:37Å、揮発性テストにおける揮発量:0.0%)を使用した点以外は実施例1と同様の方法により、発泡成形体を得た。工程1により作製されたペレット中に分散した添加剤粒子の重心間距離は5.1μmであった。工程2のバッチ発泡テストにおける単位面積当たりの泡数指数は4.6と小さかった。
添加剤としてロジン金属塩(荒川化学工業株式会社製のプラフィットH510H、XRDによるピークは観察されなかった、揮発性テストにおける揮発量:10.6質量%)を使用した点以外は実施例1と同様の方法により、発泡成形体を得た。工程1により作製されたペレット中に分散した添加剤粒子の重心間距離は4.2μmであった。工程2のバッチ発泡テストにおける単位面積当たりの泡数指数は0.4と小さかった。
添加剤として縮合リン酸エステル(大八化学工業株式会社製のSR-3000、XRDによるピークは観察されなかった、揮発性テストにおける揮発量:8.1質量%)を使用した点以外は実施例1と同様の方法により、発泡成形体を得た。工程1により作製されたペレット中に分散した添加剤粒子の重心間距離は4.1μmであった。工程2のバッチ発泡テストにおける単位面積当たりの泡数指数は0.2と小さかった。
添加剤を使用しなかった点以外は実施例1と同様の方法により、発泡成形体を得た。この発泡成形体を用いたバッチ発泡テストにおける単位面積当たりの泡数指数を1.0とし、平均泡面積指数を1.00とした。
Claims (20)
- フッ素樹脂(A)と、X線回折法における結晶子サイズが100Åより大きく、330℃における揮発量が7.0質量%以下である化合物(B)とを含み、
前記フッ素樹脂(A)中に前記化合物(B)が重心間距離5.0μm以下で分散している発泡成形用樹脂組成物。 - 前記フッ素樹脂(A)は、溶融成形可能なフッ素樹脂である請求項1記載の発泡成形用樹脂組成物。
- 前記フッ素樹脂(A)は、テトラフルオロエチレン/ヘキサフルオロプロピレン系共重合体及びテトラフルオロエチレン/パーフルオロ(アルキルビニルエーテル)共重合体からなる群より選択される少なくとも1種である請求項1又は2記載の発泡成形用樹脂組成物。
- 前記フッ素樹脂(A)は、テトラフルオロエチレン/ヘキサフルオロプロピレン系共重合体である請求項1~3のいずれかに記載の発泡成形用樹脂組成物。
- 前記フッ素樹脂(A)は、フッ素化処理されている請求項1~4のいずれかに記載の発泡成形用樹脂組成物。
- 前記フッ素樹脂(A)の含有量が80~99.99質量%である請求項1~5のいずれかに記載の発泡成形用樹脂組成物。
- 前記フッ素樹脂(A)の含有量が97質量%以上、99.85質量%未満である請求項1~6のいずれかに記載の発泡成形用樹脂組成物。
- 実質的にフッ素系低分子化合物を含まない請求項1~7のいずれかに記載の発泡成形用樹脂組成物。
- 前記化合物(B)のX線回折法における結晶子サイズが200~1000Å、330℃における揮発量が1.0質量%以下である請求項1~8のいずれかに記載の発泡成形用樹脂組成物。
- 前記フッ素樹脂(A)中に前記化合物(B)が重心間距離0.5~2.0μmで分散している請求項1~9のいずれかに記載の発泡成形用樹脂組成物。
- 前記フッ素樹脂(A)中に前記化合物(B)が密度15000個/mm2以上で分散している請求項1~10のいずれかに記載の発泡成形用樹脂組成物。
- 前記フッ素樹脂(A)中に前記化合物(B)が粒子径4.0μm以下で分散している請求項1~11のいずれかに記載の発泡成形用樹脂組成物。
- 前記化合物(B)の熱分解温度が270℃以上である請求項1~12のいずれかに記載の発泡成形用樹脂組成物。
- 前記化合物(B)は、テトラピロール系環状化合物、硫酸バリウム、二酸化ケイ素及び酸化アルミニウムからなる群より選択される少なくとも1種を含む請求項1~13のいずれかに記載の発泡成形用樹脂組成物。
- 前記化合物(B)は、銅フタロシアニンを含む請求項1~14のいずれかに記載の発泡成形用樹脂組成物。
- 前記化合物(B)の含有量が、前記フッ素樹脂(A)100質量部に対し、0.1~20質量部である請求項1~15のいずれかに記載の発泡成形用樹脂組成物。
- 前記化合物(B)の含有量が、前記フッ素樹脂(A)100質量部に対し、0.5~2.0質量部である請求項1~16のいずれかに記載の発泡成形用樹脂組成物。
- 請求項1~17のいずれかに記載の発泡成形用樹脂組成物を用いて形成された発泡成形体。
- 請求項1~17のいずれかに記載の発泡成形用樹脂組成物を発泡成形する工程を含む発泡成形体の製造方法。
- 前記発泡成形は、バッチ発泡成形である請求項19記載の発泡成形体の製造方法。
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|---|---|---|---|---|
| US4764538A (en) | 1987-12-16 | 1988-08-16 | E. I. Du Pont De Nemours And Company | Foam nucleation system for fluoropolymers |
| JPH01149840A (ja) * | 1987-12-04 | 1989-06-12 | Hitachi Cable Ltd | 樹脂発泡体の製造方法 |
| WO2003000792A1 (en) * | 2001-06-26 | 2003-01-03 | Daikin Industries, Ltd. | Resin composition, process for production thereof, and foam-insulated electric wire |
| JP2011009206A (ja) * | 2009-05-28 | 2011-01-13 | Hitachi Cable Ltd | 発泡絶縁体を有する電線・ケーブル |
| JP2011514407A (ja) | 2008-02-15 | 2011-05-06 | ダイキン アメリカ インコーポレイティッド | テトラフルオロエチレン/ヘキサフルオロプロピレン共重合体及びその製造方法、並びに電線 |
| JP2015004057A (ja) | 2013-05-21 | 2015-01-08 | 旭硝子株式会社 | 発泡体 |
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| JPH01149840A (ja) * | 1987-12-04 | 1989-06-12 | Hitachi Cable Ltd | 樹脂発泡体の製造方法 |
| US4764538A (en) | 1987-12-16 | 1988-08-16 | E. I. Du Pont De Nemours And Company | Foam nucleation system for fluoropolymers |
| WO2003000792A1 (en) * | 2001-06-26 | 2003-01-03 | Daikin Industries, Ltd. | Resin composition, process for production thereof, and foam-insulated electric wire |
| JP2011514407A (ja) | 2008-02-15 | 2011-05-06 | ダイキン アメリカ インコーポレイティッド | テトラフルオロエチレン/ヘキサフルオロプロピレン共重合体及びその製造方法、並びに電線 |
| JP2011009206A (ja) * | 2009-05-28 | 2011-01-13 | Hitachi Cable Ltd | 発泡絶縁体を有する電線・ケーブル |
| JP2015004057A (ja) | 2013-05-21 | 2015-01-08 | 旭硝子株式会社 | 発泡体 |
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| JP7761856B2 (ja) | 2025-10-29 |
| EP4682192A1 (en) | 2026-01-21 |
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