WO2024024688A1 - 非黒色導電性ポリテトラフルオロエチレン組成物、及び、成形体 - Google Patents
非黒色導電性ポリテトラフルオロエチレン組成物、及び、成形体 Download PDFInfo
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- WO2024024688A1 WO2024024688A1 PCT/JP2023/026875 JP2023026875W WO2024024688A1 WO 2024024688 A1 WO2024024688 A1 WO 2024024688A1 JP 2023026875 W JP2023026875 W JP 2023026875W WO 2024024688 A1 WO2024024688 A1 WO 2024024688A1
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- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2231—Oxides; Hydroxides of metals of tin
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
Definitions
- the present disclosure relates to a non-black conductive polytetrafluoroethylene composition and a molded article.
- Patent Document 1 describes a white conductive fluororesin composition containing a heat-melting fluororesin and zinc oxide powder.
- An object of the present disclosure is to provide a polytetrafluoroethylene composition and a molded article that are non-black and have excellent conductivity.
- the present disclosure (1) provides a non-black conductive polytetrafluoroethylene composition comprising polytetrafluoroethylene and a non-black conductive filler containing at least one selected from the group consisting of antimony-doped tin oxide and phosphorus-doped tin oxide. It is a thing.
- the present disclosure (2) is the non-black conductive polytetrafluoroethylene composition according to the present disclosure (1), which has a volume resistivity of 1.0 ⁇ 10 3 to 1.0 ⁇ 10 7 ⁇ cm.
- the present disclosure (3) is the non-black conductive polytetrafluoroethylene according to the present disclosure (1) or (2), wherein the content of the non-black conductive filler is 10 to 40% by mass with respect to the composition. It is a composition.
- the present disclosure (4) is a molded article obtained by molding a non-black conductive polytetrafluoroethylene composition in any combination with any of the present disclosures (1) to (3).
- the present disclosure (5) is the molded article according to the present disclosure (4), which is a sealing material.
- the present disclosure provides a non-black electrically conductive PTFE composition (hereinafter referred to as , also referred to as the composition of the present disclosure).
- black carbon black has been generally used as a conductive filler added to PTFE, and it has been difficult to obtain a non-black molded body.
- the composition of the present disclosure contains a specific non-black conductive filler, so it is non-black and has an excellent design. It also has excellent conductivity.
- the PTFE may be a high molecular weight PTFE.
- the PTFE preferably has a standard specific gravity (SSG) of 2.130 to 2.280.
- the standard specific gravity is more preferably 2.135 or more, more preferably 2.230 or less, and even more preferably 2.200 or less.
- the above standard specific gravity is measured using a sample molded in accordance with ASTM D4894 and by a water displacement method in accordance with ASTM D792.
- "High molecular weight" for PTFE means that the standard specific gravity is within the above range.
- Non-melting secondary processability refers to the property that the melt flow rate cannot be measured at a temperature higher than the melting point, in other words, the property that it does not flow easily even in the melting temperature range, in accordance with ASTM D-1238 and D-2116. .
- the PTFE preferably has a melting point of 324 to 360°C.
- the above melting point is a value determined as the temperature corresponding to the maximum value in the heat of fusion curve when the temperature is increased at a rate of 10° C./min using a differential scanning calorimetry (DSC) device.
- DSC differential scanning calorimetry
- the above-mentioned PTFE may be a homopolymer of TFE, or may be a modified PTFE containing a polymerized unit based on TFE (TFE unit) and a polymerized unit based on a modified monomer (modified monomer unit).
- the modified PTFE may contain 99.0% by mass or more of TFE units and 1.0% by mass or less of modified monomer units.
- the above-mentioned modified PTFE may consist only of TFE units and modified monomer units.
- the modified PTFE preferably has a content of modified monomer units in the range of 0.00001 to 1.0% by mass based on the total polymerized units.
- the lower limit of the content of the modified monomer unit is more preferably 0.0001% by mass, even more preferably 0.001% by mass, even more preferably 0.005% by mass, and particularly preferably 0.010% by mass.
- the upper limit of the content of modified monomer units is more preferably 0.90% by mass, even more preferably 0.50% by mass, even more preferably 0.40% by mass, particularly preferably 0.30% by mass, and .20% by weight is particularly preferred, 0.15% by mass is particularly preferred, and 0.10% by mass is particularly particularly preferred.
- the modified monomer unit means a part of the molecular structure of PTFE that is derived from a modified monomer.
- each polymerized unit described above can be calculated by appropriately combining NMR, FT-IR, elemental analysis, and fluorescent X-ray analysis depending on the type of monomer.
- the above-mentioned modified monomer is not particularly limited as long as it can be copolymerized with TFE; for example, perfluoroolefins such as hexafluoropropylene [HFP]; hydrogen such as trifluoroethylene, vinylidene fluoride [VDF], etc. Containing fluoroolefins; perhaloolefins such as chlorotrifluoroethylene; perfluorovinyl ether: perfluoroallyl ether; (perfluoroalkyl)ethylene, ethylene, and the like. Further, the number of modified monomers used may be one or more than one.
- perfluoroolefins such as hexafluoropropylene [HFP]
- hydrogen such as trifluoroethylene, vinylidene fluoride [VDF], etc. Containing fluoroolefins; perhaloolefins such as chlorotrifluoroethylene; perfluorovinyl ether
- perfluoro organic group means an organic group in which all hydrogen atoms bonded to carbon atoms are replaced with fluorine atoms.
- the perfluoro organic group may have an ether oxygen.
- perfluorovinyl ether examples include perfluoro(alkyl vinyl ether) [PAVE] in the general formula (A) above, in which Rf is a perfluoroalkyl group having 1 to 10 carbon atoms.
- the perfluoroalkyl group preferably has 1 to 5 carbon atoms.
- Examples of the perfluoroalkyl group in PAVE include perfluoromethyl group, perfluoroethyl group, perfluoropropyl group, perfluorobutyl group, perfluoropentyl group, perfluorohexyl group, and the like.
- perfluorovinyl ether further includes those in the above general formula (A) in which Rf is a perfluoro(alkoxyalkyl) group having 4 to 9 carbon atoms, and Rf is the following formula:
- Rf is a group represented by the following formula:
- n an integer of 1 to 4.
- PFAE Perfluoroalkylethylene
- examples thereof include (perfluorobutyl)ethylene (PFBE) and (perfluorohexyl)ethylene.
- CF 2 CF-CF 2 -ORf 1 (B)
- Rf 1 represents a perfluoroorganic group.
- fluoromonomers represented by the following formula.
- Rf 1 is preferably a perfluoroalkyl group having 1 to 10 carbon atoms or a perfluoroalkoxyalkyl group having 1 to 10 carbon atoms.
- the above-mentioned PTFE is preferably in the form of particles, and preferably has an average particle diameter of 1 to 2000 ⁇ m.
- the average particle diameter is more preferably 1000 ⁇ m or less, and even more preferably 700 ⁇ m or less. Moreover, it is more preferable that it is 10 micrometers or more, and it is still more preferable that it is 15 micrometers or more. If the average particle size is too large, it may become difficult to mold or mix with a filler, and if the average particle size is too small, the fluidity of the PTFE composition may be poor.
- the above average particle size was measured using a laser diffraction particle size distribution measuring device without using a cascade and at a dispersion pressure of 3.0 bar, and was determined to be equal to the particle size corresponding to 50% of the integrated particle size distribution (volume basis). do.
- a laser diffraction particle size distribution measuring device for example, HELOS&RODOS manufactured by JEOL Ltd. can be used.
- the PTFE is a PTFE molding powder.
- the above-mentioned PTFE molding powder is a powder obtained by suspension polymerization of TFE.
- the above suspension polymerization can be carried out by a known method. For example, by dispersing a polymerization initiator in an aqueous medium and polymerizing the monomers necessary to constitute the above-mentioned PTFE, the anionic fluorine-containing surfactant is not used or only a limited amount is used. Suspension polymerized particles can be isolated directly.
- the PTFE molding powder may be obtained by granulating particles obtained by polymerization using a known method.
- the content of the PTFE is preferably 60 to 90% by mass, more preferably 70 to 90% by mass, and 70 to 85% by mass, based on the composition. It is even more preferable.
- the non-black conductive filler in the composition of the present disclosure includes at least one selected from the group consisting of antimony-doped tin oxide and phosphorous-doped tin oxide.
- the non-black conductive filler may be made of at least one selected from the group consisting of antimony-doped tin oxide and phosphorus-doped tin oxide, and the base particles are made of antimony-doped tin oxide and phosphorous-doped tin oxide. It may be coated with at least one selected from the group.
- the non-black conductive filler does not contain zinc oxide.
- the base particles include talc, mica, glass flakes, SiO 2 flakes, TiO 2 flakes, and Al 2 O. 3 flakes, etc. Among them, talc and mica are preferred.
- the amount of the coating is 20 to 40% by mass based on the total amount of the coating and the base particles. It is preferable that there be.
- the non-black conductive filler includes (a) antimony-doped tin oxide particles, (b) particles in which at least one base particle selected from the group consisting of talc and mica is coated with antimony-doped tin oxide; In addition, at least one selected from the group consisting of (c) phosphorus-doped tin oxide particles is preferable, and because of its superior conductivity, (a) antimony-doped tin oxide particles, and (b) the group consisting of talc and mica. At least one type selected from the group consisting of particles in which at least one type of base material particle selected from the group consisting of particles coated with antimony-doped tin oxide is more preferable.
- the non-black conductive filler preferably has an average particle diameter of 1 to 100 ⁇ m, more preferably 1 to 30 ⁇ m, and even more preferably 1 to 10 ⁇ m.
- the above average particle size was measured using a laser diffraction particle size distribution measuring device without using a cascade and at a dispersion pressure of 3.0 bar, and was determined to be equal to the particle size corresponding to 50% of the integrated particle size distribution (volume basis). do.
- the laser diffraction particle size distribution measuring device for example, HELOS&RODOS manufactured by JEOL Ltd. can be used.
- the content of the non-black conductive filler is preferably 10 to 40% by mass, more preferably 10 to 30% by mass, and 15 to 30% by mass, based on the composition. It is more preferable that it is mass %.
- composition of the present disclosure may consist only of the above-mentioned PTFE and the above-mentioned non-black conductive filler, or may contain other components as necessary.
- various additives such as metal, inorganic or organic reinforcing fillers, compatibilizers, lubricants (fluorocarbon, carbon graphite, molybdenum disulfide), stabilizers, etc. may be combined and blended. Can be done.
- composition of the present disclosure can be prepared by, for example, using the PTFE, the non-black conductive filler, and other components added as necessary in a V-type blender, tumbler, Henschel mixer, ball mixer, Lodige mixer, etc. It can be obtained by mixing in a mixer.
- the composition of the present disclosure has electrical conductivity.
- the volume resistivity is preferably 1.0 ⁇ 10 3 to 1.0 ⁇ 10 7 ⁇ cm, and preferably 1.0 ⁇ 10 3 to 6.0 ⁇ 10 6 ⁇ cm. More preferably, it is 1.0 ⁇ 10 3 to 2.0 ⁇ 10 6 ⁇ cm, and even more preferably 1.0 ⁇ 10 4 to 2.0 ⁇ 10 6 ⁇ cm. Particularly preferred.
- the volume resistivity is determined by the following method. The composition is pressure molded at a molding pressure of 50 MPa and then fired at 370° C. to obtain a cylindrical molded body (outer diameter 12 mm, height 40 mm).
- volume resistivity ( ⁇ cm) Measured value ( ⁇ ) ⁇ Cross-sectional area of cylinder (cm 2 ) / Height of cylinder (cm)
- the cross-sectional area of the cylinder is the cross-sectional area of a plane perpendicular to the height direction.
- the composition of the present disclosure can be suitably used as a molding material.
- the present disclosure also relates to a molded article obtained by molding the composition of the present disclosure.
- the molded article of the present disclosure is non-black and has excellent design. It also has excellent conductivity. Further, the molded article of the present disclosure has good tensile strength at break and good tensile elongation at break.
- Methods for molding the composition of the present disclosure include, but are not limited to, compression molding, ram extrusion molding, isostatic molding, and the like. Among these, compression molding is preferred.
- the shape of the molded article of the present disclosure is not particularly limited, and examples include a sheet, a film, a ring, a rod, a pipe, and a fiber.
- the molded article of the present disclosure is expected to be used in sealing materials such as gaskets and packing, OA equipment rolls and tubes, sanitary piping for foods and drugs, interior linings of tanks, etc.
- sealing materials such as gaskets and packing are preferred.
- PTFE Polytetrafluoroethylene
- SSG standard specific gravity
- ⁇ Average particle diameter> Using a laser diffraction particle size distribution analyzer (HELOS & RODOS manufactured by JEOL Ltd.), without using a cascade, the measurement was carried out at a dispersion pressure of 3.0 bar, and the particle size was determined to correspond to 50% of the integrated particle size distribution (volume basis). I assumed they were equal.
- HELOS & RODOS laser diffraction particle size distribution analyzer
- ⁇ Melting point> Using a differential scanning calorimetry (DSC) device, the temperature was determined as the temperature corresponding to the maximum value in the heat of fusion curve when the temperature was raised at a rate of 10° C./min.
- DSC differential scanning calorimetry
- volume resistivity ( ⁇ cm) Measured value ( ⁇ ) ⁇ Cross-sectional area of cylinder (cm 2 ) / Height of cylinder (cm)
- the cross-sectional area of the cylinder is the cross-sectional area of a plane perpendicular to the height direction.
- Comparative example 1 97 parts by mass of the polytetrafluoroethylene resin powder obtained by suspension polymerization (PTFE 1) and 3 parts by mass of the carbon black were mixed using a Henschel mixer to obtain a PTFE composition.
- Comparative Examples 2 to 4 and Examples 1 to 5 A PTFE composition was obtained in the same manner as in Comparative Example 1, except that the type and amount of the conductive filler were changed as shown in Table 1. The results are shown in Table 1.
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Abstract
Description
従来、PTFEに添加する導電性フィラーとしては黒色のカーボンブラックが一般的に用いられており、非黒色の成形体を得ることは困難であった。本開示の組成物は、特定の非黒色導電性フィラーを含むことにより、非黒色であり、意匠性に優れる。また、導電性にも優れる。
PTFEについての「高分子量」とは、上記標準比重が上記の範囲内にあることを意味する。
本明細書において、上記変性モノマー単位とは、PTFEの分子構造の一部分であって変性モノマーに由来する部分を意味する。
CF2=CF-ORf (A)
(式中、Rfは、パーフルオロ有機基を表す。)で表されるパーフルオロ不飽和化合物等が挙げられる。本明細書において、上記「パーフルオロ有機基」とは、炭素原子に結合する水素原子が全てフッ素原子に置換されてなる有機基を意味する。上記パーフルオロ有機基は、エーテル酸素を有していてもよい。
CF2=CF-CF2-ORf1 (B)
(式中、Rf1は、パーフルオロ有機基を表す。)で表されるフルオロモノマーが挙げられる。
上記平均粒子径は、レーザー回折式粒度分布測定装置を用い、カスケードは使用せず、分散圧力3.0barで測定を行い、粒度分布積算(体積基準)の50%に対応する粒子径に等しいとする。レーザー回折式粒度分布測定装置としては、例えば、日本電子株式会社製のHELOS&RODOSを用いることができる。
上記PTFEモールディングパウダーは、重合により得た粒子を公知の方法により造粒して得られたものであってもよい。
上記の特定の非黒色導電性フィラーを使用することにより、酸化亜鉛を使用しなくても、非黒色で、導電性に優れるPTFE組成物が得られる。
また、上記非黒色導電性フィラーが少量であっても優れた導電性を付与できるので、引張破断強度や引張破断伸びが悪化しにくい。
上記非黒色導電性フィラーは、酸化亜鉛を含まないことが好ましい。
上記平均粒子径は、レーザー回折式粒度分布測定装置を用い、カスケードは使用せず、分散圧力3.0barで測定を行い、粒度分布積算(体積基準)の50%に対応する粒子径に等しいとする。レーザー回折式粒度分布測定装置としては、例えば、日本電子株式会社製のHELOS&RODOSを用いることができる。
上記他の成分としては、金属、無機又は有機の補強用充填材や相溶化剤、潤滑剤(フッ化カーボン、カーボングラファイト、二硫化モリブデン)、安定剤等種々の添加剤を組み合わせて配合することができる。
上記体積抵抗率は、下記方法により求める。
組成物を成形圧力50MPaで加圧成形した後、370℃で焼成し、円柱状成形体(外径12mm、高さ40mm)を得る。この成形体の直流抵抗をデジタルマルチメーター(HT26:HT ITALIA社製)を用いて測定し、下式により体積抵抗率(Ω・cm)を算出する。
体積抵抗率(Ω・cm)=測定値(Ω)×円柱の断面積(cm2)/円柱の高さ(cm)
ここで、円柱の断面積は、高さ方向に垂直な平面による断面積である。
本開示の成形体は、非黒色であり、意匠性に優れる。また、導電性にも優れる。
また、本開示の成形体は、引張破断強度及び引張破断伸びが良好である。
なかでも、ガスケット、パッキン等のシール材が好ましい。
PTFE1:ポリフロンM-18F、ダイキン工業株式会社製、TFE単独重合体、標準比重(SSG):2.164、融点:345℃、平均粒子径:20μm。
カーボンブラック
非黒色導電性フィラー(1):酸化亜鉛
非黒色導電性フィラー(2):アンチモンドープ酸化スズ(平均粒子径:5μm)
非黒色導電性フィラー(3):リンドープ酸化スズ(平均粒子径:4μm)
レーザー回折式粒度分布測定装置(日本電子株式会社製HELOS&RODOS)を用い、カスケードは使用せず、分散圧力3.0barで測定を行い、粒度分布積算(体積基準)の50%に対応する粒子径に等しいとした。
示差走査熱量測定(DSC)装置を用い、10℃/分の速度で昇温したときの融解熱曲線における極大値に対応する温度として求めた。
PTFE組成物を成形圧力50MPaで加圧成形した後、370℃で焼成し、円柱状成形体(外径12mm、高さ40mm)を得た。この成形体の直流抵抗をデジタルマルチメーター(HT26:HT ITALIA製)を用いて測定し、下式により体積抵抗率(Ω・cm)を算出した。
体積抵抗率(Ω・cm)=測定値(Ω)×円柱の断面積(cm2)/円柱の高さ(cm)
ここで、円柱の断面積は、高さ方向に垂直な平面による断面積である。
ASTM D4745に準拠して測定した。
懸濁重合により得られたポリテトラフルオロエチレン樹脂の粉末(上記PTFE1)を97質量部と、上記カーボンブラックを3質量部とをヘンシェルミキサーを用いて混合し、PTFE組成物を得た。
導電性フィラーの種類及び充填量を表1に記載のように変更したこと以外は、比較例1と同様にしてPTFE組成物を得た。
結果を表1に示す。
Claims (5)
- ポリテトラフルオロエチレンと、アンチモンドープ酸化スズ及びリンドープ酸化スズからなる群より選択される少なくとも1種を含む非黒色導電性フィラーとを含む非黒色導電性ポリテトラフルオロエチレン組成物。
- 体積抵抗率が1.0×103~1.0×107Ω・cmである請求項1に記載の非黒色導電性ポリテトラフルオロエチレン組成物。
- 前記非黒色導電性フィラーの含有量が、前記組成物に対し10~40質量%である請求項1又は2に記載の非黒色導電性ポリテトラフルオロエチレン組成物。
- 請求項1~3のいずれかに記載の非黒色導電性ポリテトラフルオロエチレン組成物を成形して得られる成形体。
- シール材である請求項4に記載の成形体。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP23846418.4A EP4563647A1 (en) | 2022-07-29 | 2023-07-21 | Non-black conductive polytetrafluoroethylene composition and molded body |
| CN202380055414.1A CN120092047A (zh) | 2022-07-29 | 2023-07-21 | 非黑色导电性聚四氟乙烯组合物以及成型体 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022121952 | 2022-07-29 | ||
| JP2022-121952 | 2022-07-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024024688A1 true WO2024024688A1 (ja) | 2024-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2023/026875 Ceased WO2024024688A1 (ja) | 2022-07-29 | 2023-07-21 | 非黒色導電性ポリテトラフルオロエチレン組成物、及び、成形体 |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4563647A1 (ja) |
| JP (1) | JP7577800B2 (ja) |
| CN (1) | CN120092047A (ja) |
| TW (1) | TW202413523A (ja) |
| WO (1) | WO2024024688A1 (ja) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63215745A (ja) * | 1987-03-04 | 1988-09-08 | Toshiba Silicone Co Ltd | 感圧導電性弾性体組成物 |
| JP2013136675A (ja) | 2011-12-28 | 2013-07-11 | Du Pont Mitsui Fluorochem Co Ltd | 導電性フッ素樹脂組成物およびその成形品 |
| JP2015067702A (ja) * | 2013-09-27 | 2015-04-13 | 積水化成品工業株式会社 | 複合粒子及びその製造方法、並びにフィルム |
| EP3628644A1 (en) * | 2018-09-25 | 2020-04-01 | Guarniflon S.P.A. | Filler and polymeric compositions containing same |
-
2023
- 2023-07-21 CN CN202380055414.1A patent/CN120092047A/zh active Pending
- 2023-07-21 EP EP23846418.4A patent/EP4563647A1/en active Pending
- 2023-07-21 WO PCT/JP2023/026875 patent/WO2024024688A1/ja not_active Ceased
- 2023-07-21 JP JP2023119357A patent/JP7577800B2/ja active Active
- 2023-07-25 TW TW112127765A patent/TW202413523A/zh unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63215745A (ja) * | 1987-03-04 | 1988-09-08 | Toshiba Silicone Co Ltd | 感圧導電性弾性体組成物 |
| JP2013136675A (ja) | 2011-12-28 | 2013-07-11 | Du Pont Mitsui Fluorochem Co Ltd | 導電性フッ素樹脂組成物およびその成形品 |
| JP2015067702A (ja) * | 2013-09-27 | 2015-04-13 | 積水化成品工業株式会社 | 複合粒子及びその製造方法、並びにフィルム |
| EP3628644A1 (en) * | 2018-09-25 | 2020-04-01 | Guarniflon S.P.A. | Filler and polymeric compositions containing same |
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| Publication number | Publication date |
|---|---|
| JP2024019053A (ja) | 2024-02-08 |
| JP7577800B2 (ja) | 2024-11-05 |
| TW202413523A (zh) | 2024-04-01 |
| EP4563647A1 (en) | 2025-06-04 |
| CN120092047A (zh) | 2025-06-03 |
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