WO2023120571A1 - Joint à base de résine fluorée et son procédé de production - Google Patents

Joint à base de résine fluorée et son procédé de production Download PDF

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Publication number
WO2023120571A1
WO2023120571A1 PCT/JP2022/047091 JP2022047091W WO2023120571A1 WO 2023120571 A1 WO2023120571 A1 WO 2023120571A1 JP 2022047091 W JP2022047091 W JP 2022047091W WO 2023120571 A1 WO2023120571 A1 WO 2023120571A1
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WO
WIPO (PCT)
Prior art keywords
gasket
fluororesin
less
thickness
preform
Prior art date
Application number
PCT/JP2022/047091
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English (en)
Japanese (ja)
Inventor
清華 戸田
真也 黒河
Original Assignee
株式会社バルカー
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社バルカー filed Critical 株式会社バルカー
Priority to CN202280058667.XA priority Critical patent/CN117897570A/zh
Publication of WO2023120571A1 publication Critical patent/WO2023120571A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/18—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets by squeezing between surfaces, e.g. rollers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a fluororesin gasket and its manufacturing method. More particularly, the present invention relates to a fluororesin gasket that can be suitably used in applications requiring thin gaskets, such as pumps and valves, and a method for producing the same.
  • Fluororesin gaskets are used for flanges, etc., due to their chemical resistance, heat resistance, non-adhesiveness, and low wear.
  • fluororesins, fillers, and processing aids have been proposed.
  • a petroleum-based hydrocarbon solvent having a fractionation temperature of 120° C. or less is used as the processing aid when rolling the sheet-forming resin composition containing the agent using a rolling roll having a roll temperature of 40 to 80° C.
  • a method for producing a filled fluororesin sheet using a processing aid containing 30% by mass or more (see, for example, Patent Documents 1 and 2), fluororesin, powder filler A, powder filler B, and processing aid A step of preparing a sheet-forming resin composition by mixing and rolling the sheet-forming resin composition with a rolling roll having a roll temperature of 40 to 80 ° C., cumulative in the particle size distribution of the powder filler A
  • the particle size D A (50) when the number is 50% and the particle size D B (50) when the cumulative number in the particle size distribution of the powder filler B is 50 % are expressed by the formula (1): D B (50) ⁇ 0.73 D A (50) (1) and the volume V A of the powder filler A and the volume V B of the powder filler B are represented by the formula (2): 1 ⁇ V A /V B ⁇ 3 (2)
  • a method for manufacturing a filler-filled fluororesin sheet using a processing aid that satisfies the relationship represented by Patent Document 3) has been proposed.
  • the method for producing a filler-containing fluororesin sheet it is possible to produce a fluororesin sheet having excellent stress relaxation properties and airtightness (sealing properties) even when the filling rate of the filler is high. .
  • the present invention provides a fluororesin gasket that can be suitably used in equipment such as pump casings where a thin gasket is required, and the thickness of the gasket is 0.8 mm or less.
  • An object of the present invention is to provide a fluororesin gasket capable of ensuring high airtightness (sealing property) between the gasket and a flange.
  • the present invention (1) A fluororesin gasket containing a fluororesin and a filler, having a thickness of 0.8 mm or less, a surface roughness Ra of 2.1 ⁇ m or less, and a compactness of 0.920 or more.
  • a fluororesin gasket characterized by (2) A method for producing a fluororesin gasket according to (1) above, wherein a preform containing a fluororesin and a filler and having a thickness of 20 to 200 mm is used, and the thickness is 0.8 mm.
  • a method for manufacturing a fluororesin gasket characterized by repeating rolling of the preform until the surface roughness Ra is 2.1 ⁇ m or less and the density is 0.920 or more, and (3) rolling the preform.
  • a fluororesin gasket capable of ensuring high airtightness (sealing property) between the gasket and the flange while the thickness of the gasket is 0.8 mm or less.
  • the fluororesin gasket of the present invention contains a fluororesin and a filler, has a thickness of 0.8 mm or less, and has a surface roughness Ra of 2.1 ⁇ m or less. and a compactness of 0.920 or more. According to the fluororesin gasket of the present invention, it is possible to ensure high airtightness (sealing property) with respect to the flange while the thickness of the gasket is 0.8 mm or less.
  • the thickness of the fluororesin gasket is 0.8 mm or less, when the gasket is installed between the flanges and the flanges are tightened, the compression ratio of the gasket is low due to the thin thickness of the gasket. Airtightness (sealing property) at the interface between the gasket and the flange is inevitably degraded compared to gaskets having a thickness greater than 0.8 mm.
  • the thickness of the gasket is 0.8 mm or less
  • the high airtightness (sealing property) is mainly due to the gasket
  • the surface roughness Ra of the gasket is 2.1 ⁇ m or less
  • the denseness of the gasket is 0.920 or more.
  • the fluororesin gasket of the present invention can ensure high airtightness (sealing property) even though the thickness of the fluororesin gasket is 0.8 mm or less.
  • Equipment WHEREIN It can be used suitably for the use where a gasket with thin thickness is required.
  • the fluororesin gasket of the present invention contains, for example, a fluororesin and a filler, uses a preform having a thickness of 20 to 200 mm, and has a thickness of 0.8 mm or less and a surface roughness Ra of 2.1 ⁇ m or less. , by repeating rolling of the preform until the compactness reaches 0.920 or more.
  • a gasket-forming resin composition containing a fluororesin and a filler can be used as a raw material for a fluororesin gasket.
  • fluororesins examples include polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-ethylene copolymer polymer (ETFE), polyvinylidene fluoride (PVDF), polychlorotrifluoroethylene (PCTFE), chlorotrifluoroethylene-ethylene copolymer (ECTFE), etc., but the present invention is limited only to such examples. not something.
  • PTFE polytetrafluoroethylene
  • PFA tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer
  • FEP tetrafluoroethylene-hexafluoropropylene copolymer
  • ETFE tetrafluoroethylene-ethylene copolymer polymer
  • PVDF polyvinylidene fluoride
  • the fluororesin can usually be used in the form of a powder, but it can also be used in the form of a dispersion of fluororesin powder in which the fluororesin is dispersed in a dispersion medium.
  • a dispersion of fluororesin powder has the advantage that a component such as a filler can be easily and uniformly dispersed in the dispersion.
  • fillers include carbon-based fillers such as graphite, carbon black, expanded graphite, activated carbon, and carbon nanotubes; inorganic powders such as silicon carbide, talc, mica, clay, calcium carbonate, and magnesium oxide; and resins such as polyphenylene sulfide.
  • carbon-based fillers such as graphite, carbon black, expanded graphite, activated carbon, and carbon nanotubes
  • inorganic powders such as silicon carbide, talc, mica, clay, calcium carbonate, and magnesium oxide
  • resins such as polyphenylene sulfide.
  • powder such as powder, glass fiber, carbon fiber, aramid fiber, and short fiber such as rock wool, but the present invention is not limited to these examples. These fillers may be used alone or in combination of two or more.
  • the particle size of the powdery filler is not particularly limited, but from the viewpoint of improving the mechanical strength of the fluororesin gasket, it is preferably 1 ⁇ m or more, more preferably 2 ⁇ m or more, and still more preferably 3 ⁇ m or more. From the viewpoint of improving the smoothness of the gasket surface, the thickness is preferably 100 ⁇ m or less, more preferably 80 ⁇ m or less, and even more preferably 30 ⁇ m or less.
  • the particle size of the powdery filler means the particle size measured by the Coulter Counter method. In the Coulter counter method, an electrolyte in which a filler is suspended is passed through an aperture, and the particle size is measured by reading the change in voltage pulse generated in proportion to the volume of the filler at that time. The method.
  • the fiber length of the fibrous filler is not particularly limited, but from the viewpoint of improving the mechanical strength and surface smoothness of the fluororesin gasket, it is preferably 15 ⁇ m or less, more preferably 3 to 15 ⁇ m, and still more preferably 3 ⁇ m. ⁇ 10 ⁇ m.
  • the filler per 100 parts by mass of the fluororesin is preferably 10 to 200 parts by mass, from the viewpoint of improving the mechanical strength of the fluororesin gasket and the airtightness (sealing property) at the interface between the fluororesin gasket and the gasket. More preferably 100 to 180 parts by mass.
  • the gasket-forming resin composition contains a processing aid from the viewpoint of expanding the fluororesin in the initial step of rolling a preform obtained by molding the gasket-forming resin composition into a rod or ribbon. preferably included.
  • processing aids include petroleum hydrocarbon compounds such as paraffin hydrocarbon compounds.
  • the fractionation temperature of the processing aid is not particularly limited, it is preferably 200° C. or less, more preferably 180° C. or less from the viewpoint of allowing the processing aid to sufficiently remain in the fluororesin gasket.
  • the petroleum-based hydrocarbon compound in which the fractionation temperature of the processing aid is 200°C or less include paraffinic hydrocarbon compounds in which the fractionation temperature of the processing aid is 200°C or less. , is not limited to such examples. Processing aids having a fractional distillation temperature of 200° C. or less are readily commercially available.
  • processing aids include, for example, Exxon Mobil Company, trade names: Isopar C (fractionation temperature: 97 to 104° C.), Isopar G (fractionation temperature: 158 to 175° C.) ) and the like.
  • the amount of the processing aid per 100 parts by mass of the total amount of the fluororesin and the filler is preferably 5 to 50 parts by mass, more preferably 10 to 50 parts by mass, from the viewpoint of moderate expansion of the fluororesin when the preform is rolled. 30 parts by mass, more preferably 15 to 30 parts by mass.
  • the gasket-forming resin composition may contain, within a range that does not hinder the object of the present invention, tackifiers such as terpene resins, terpene-phenol resins, coumarone resins, coumarone-indene resins, rosin, ultraviolet absorbers, Antioxidants, polymerization inhibitors, coloring agents such as pigments and dyes may be contained in appropriate amounts.
  • tackifiers such as terpene resins, terpene-phenol resins, coumarone resins, coumarone-indene resins, rosin, ultraviolet absorbers, Antioxidants, polymerization inhibitors, coloring agents such as pigments and dyes may be contained in appropriate amounts.
  • the gasket-forming resin composition may be prepared by mixing fluororesin, filler, and, if necessary, processing aids, additives, etc., in an arbitrary order all at once or in small portions over multiple times, so as to have a uniform composition.
  • a preform is manufactured from the gasket-forming resin composition.
  • the method for producing a preform from a gasket-forming resin composition include a method for producing a preform by extrusion molding a gasket-forming resin composition, and a method for producing a preform by compression molding a gasket-forming resin composition. Examples include a method for producing a foam, but the present invention is not limited to such examples.
  • the preform is rolled with rolling rolls.
  • the preform is repeatedly rolled until the fluororesin gasket has a thickness of 0.8 mm or less, a surface roughness Ra of 2.1 ⁇ m or less, and a density of 0.920 or more.
  • One of the features of the present invention is that In the present invention, since the above operation is adopted, it is possible to obtain a fluororesin gasket capable of ensuring high airtightness (sealing property) in spite of having a thickness of 0.8 mm or less.
  • a fluororesin gasket having a thickness of 0.8 mm or less, a surface roughness Ra of 2.1 ⁇ m or less, and a compactness of 0.920 or more is used when the fluororesin sheet is compressed when the preform is rolled. It can be produced by appropriately adjusting the magnification and/or the number of times of compression.
  • Rolling of the fluororesin sheet can be performed using rolling rolls such as biaxial rolls.
  • the surface temperature of the rolling roll may be room temperature, may be higher than room temperature, or may be lower than room temperature. From the viewpoint of obtaining a fluororesin gasket capable of ensuring high airtightness (sealing property), the temperature is preferably 40 to 80°C.
  • the rolling of the preform is repeated multiple times.
  • the thickness of the preform is gradually reduced by narrowing the roll gap between the rolling rolls each time the preform is rolled, and the compression ratio and compactness of the fluororesin sheet are improved. can increase
  • the gap between the rolling rolls when rolling the preform varies depending on the thickness of the fluororesin sheet before rolling, the number of times of rolling, etc., so it cannot be generally determined, but usually the fluororesin sheet before rolling It is preferably about 40 to 60% of the thickness of the roll and the roll speed is about 3 to 10 m/min.
  • the fluororesin gasket of the present invention can be obtained, for example, by rolling a preform with a rolling roll at a compression ratio of 60 times or more, or rolling a preform with a rolling roll at a rolling number of times of 7 or more, and measuring the surface roughness Ra. It can be obtained by adjusting the density to 2.1 ⁇ m or less and the density to 0.920 or more. In the present invention, either one of the compression ratio and the number of times of rolling may be adopted, or both of them may be adopted.
  • the compression ratio of the preform should be 60 times or more from the viewpoint of producing a fluororesin gasket that can ensure high airtightness (sealing property) between the gasket and the flange while being 0.8 mm or less. is preferred.
  • the upper limit of the compression ratio of the preform is not particularly limited, but from the viewpoint of efficiently producing the fluororesin gasket of the present invention, it is preferably 500 times or less, more preferably 400 times or less. Therefore, the compression ratio of the fluororesin sheet is preferably 60 times or more, more preferably 60 to 500 times, still more preferably 60 to 400 times.
  • the preform In the range of the compression ratio of the preform, if the compression ratio is low enough to obtain a fluororesin gasket having a predetermined surface roughness Ra and a predetermined denseness, the preform is within the scope of the present invention. By increasing the number of times of rolling, it is possible to obtain a fluororesin gasket having a predetermined surface roughness Ra and a predetermined denseness.
  • the number of times the preform is rolled means the number of times the preform is rolled.
  • the number of rolling of the preform should be 6 or more from the viewpoint of producing a fluororesin gasket capable of ensuring high airtightness (sealing property) between the gasket and the flange while being 0.8 mm or less. is preferred.
  • the upper limit of the number of times the preform is rolled is not particularly limited, but from the viewpoint of efficiently producing the fluororesin gasket of the present invention, it is preferably 20 times or less, more preferably 15 times or less. Therefore, the preform is preferably rolled 6 times or more, more preferably 6 to 20 times, and still more preferably 6 to 15 times.
  • the preform In the range of the number of rolling times of the preform, if the number of rolling times is small enough to obtain a fluororesin gasket having a predetermined surface roughness Ra and a predetermined denseness, the preform can be rolled within the scope of the present invention. By increasing the compression ratio, it is possible to obtain a fluororesin gasket having a predetermined surface roughness Ra and a predetermined compactness.
  • the surface roughness Ra is 2.1 ⁇ m or less, and the density is 0.920 or more, the surface roughness Ra is 2.1 ⁇ m. or less, and a fluororesin gasket having a compactness of 0.920 or more is obtained.
  • the thickness, surface roughness Ra and compactness of the fluororesin gasket are all values at room temperature (approximately 25°C).
  • the surface roughness Ra of the fluororesin gasket means the arithmetic mean roughness Ra specified in JIS B0601 (2013).
  • the surface roughness Ra of the fluororesin gasket is from the viewpoint of obtaining a fluororesin gasket that can ensure high airtightness (sealing property) between the gasket and the flange while the thickness of the gasket is 0.8 mm or less. Therefore, it is 2.1 ⁇ m or less, preferably 2.09 ⁇ m or less.
  • the lower limit of the surface roughness Ra of the fluororesin gasket is not particularly limited, it is preferably small.
  • the above-mentioned "density of the fluororesin gasket obtained from the true density of each nonvolatile component contained in the fluororesin gasket” is, specifically, the true density of each nonvolatile component contained in the fluororesin gasket and the fluororesin
  • the formula: [Density of fluororesin gasket obtained from the true density of each non-volatile component contained in the fluororesin gasket] ⁇ (Dm ⁇ Cm)/100
  • Dm is the true density of the specific non-volatile component constituting the fluororesin gasket
  • Cm is the content (% by mass) of the specific non-volatile component in all the non-volatile components constituting the fluororesin gasket
  • Means the value obtained by the formula represented by The true density of the specific non-volatile component is, for example, 2.2 g/cm 3 for polytetrafluoroethylene (PTFE), 2.6 g/cm 3 for fine powder clay, and 3.2
  • the denseness of the fluororesin gasket is ideally the same as the density of the fluororesin gasket obtained from the true density of each non-volatile component contained in the fluororesin gasket.
  • the denseness of the fluororesin gasket is usually a smaller value than the density of the fluororesin gasket obtained from the true density of each non-volatile component contained in the fluororesin gasket. The denseness of the fluororesin gasket changes depending on the compression ratio and the number of compressions of the preform, and tends to increase as the compression ratio of the preform increases and the number of compressions increases.
  • the density of a fluororesin gasket can be obtained by measuring the mass and volume of the fluororesin gasket.
  • the density of a fluororesin gasket obtained from the true density of each non-volatile component contained in the fluororesin gasket can be obtained by separating each non-volatile component from the fluororesin gasket, determining the true density of each non-volatile component It can be determined by measuring the content of each non-volatile component.
  • the denseness of the fluororesin gasket is: 0.920 or more.
  • the upper limit of the denseness of the fluororesin gasket is not particularly limited, the higher the density, the better.
  • the fluororesin gasket obtained above may be left at room temperature or heated as appropriate to volatilize and remove the processing aid contained in the laminated sheet.
  • the fluororesin gasket can be baked by heating at a temperature higher than the melting point of the fluororesin.
  • the heating temperature varies depending on the type of fluororesin and cannot be determined unconditionally, but from the viewpoint of uniformly baking the fluororesin gasket and avoiding decomposition of the fluororesin, it is usually about 340 to 370°C. Preferably.
  • the fluororesin gasket of the present invention may be used as it is, or may be used after being cut into a desired shape and size.
  • the thickness of the fluororesin gasket of the present invention varies depending on the application of the fluororesin gasket, but high airtightness (sealing property) is ensured even if the thickness of the fluororesin gasket of the present invention is thin. It is preferably 0.8 mm or less from the viewpoint of sufficiently exhibiting the property of being able to
  • the fluororesin gasket of the present invention can ensure high airtightness (sealing property) in spite of its thickness being 0.8 mm or less. In equipment, it can be suitably used for applications where a gasket with a small thickness is required.
  • Examples 1-7 and Comparative Examples 1-3 Polytetrafluoroethylene (PTFE) fine powder [manufactured by Daikin Industries, Ltd., product number: F104] 1000 g, fine powder clay as a filler [manufactured by Showa KDE Co., Ltd., product number: NK-300] 1450 g (Example 1- 6 and Comparative Examples 1 to 3) or silicon carbide [manufactured by Showa Denko K.K., product number: #1200] 1450 g (used in Example 7), processing aid [manufactured by ExxonMobil, product name: Isopar C] After mixing 125 g and 125 g of a processing aid [manufactured by ExxonMobil, trade name: Isopar G] in a kneader for 5 minutes, the resulting mixture was extruded in an extruder having a rectangular die opening size of 300 mm x 20 mm. Preforms having the thicknesses shown in Table
  • the preform obtained above was run at a running speed of 6 m/min. It is passed between the rolls of the biaxial rolls, successively passed between the rolls of the biaxial rolls in which the gap between the rolls of the biaxial rolls is gradually narrowed, and rolled, and finally the fluororesin shown in Table 1.
  • a fluororesin gasket was obtained by passing between rolls of biaxial rolls having a gap corresponding to the thickness of the gasket and rolling. The number of times the preform is rolled by passing it between the rolls of the biaxial rolls (the number of rolling times) and the compression ratio of the preform are as shown in the manufacturing conditions column in Table 1.
  • the thickness, surface roughness and denseness of the fluororesin gasket obtained above are shown in the gasket performance column in Table 1.
  • the gasket When the leak rate is 3.0 ⁇ 10 ⁇ 4 Pa ⁇ m 3 /sec or less, the gasket satisfies the airtightness (sealing property) acceptance criteria.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gasket Seals (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Sealing Material Composition (AREA)

Abstract

L'invention concerne un joint à base de résine fluorée grâce auquel il est possible, avec une épaisseur de joint de 0,8 mm ou moins, d'assurer un degré élevé d'étanchéité à l'air (capacité d'étanchéité) entre des brides. Ce joint de résine fluorée contient une résine fluorée et une charge, et a une épaisseur de 0,8 mm ou moins. Ce joint de résine fluorée a une rugosité de surface Ra de 2,1 µm ou moins et une densité de 0,920 ou plus.
PCT/JP2022/047091 2021-12-24 2022-12-21 Joint à base de résine fluorée et son procédé de production WO2023120571A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202280058667.XA CN117897570A (zh) 2021-12-24 2022-12-21 氟树脂制垫片及其制造方法

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Application Number Priority Date Filing Date Title
JP2021210666 2021-12-24
JP2021-210666 2021-12-24

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Publication Number Publication Date
WO2023120571A1 true WO2023120571A1 (fr) 2023-06-29

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TW (1) TW202336138A (fr)
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008007607A (ja) * 2006-06-28 2008-01-17 Nippon Valqua Ind Ltd 充填材入りフッ素樹脂シートおよび充填材入りフッ素樹脂シートの製造方法
JP2011153254A (ja) * 2010-01-28 2011-08-11 Nippon Valqua Ind Ltd シート形成用組成物、充填材入りフッ素樹脂シートおよび充填材入りフッ素樹脂シートの製造方法
JP2020524096A (ja) * 2017-06-15 2020-08-13 ダブリュ．エル．ゴア アンド アソシエイツ，インコーポレイティドＷ．Ｌ． Ｇｏｒｅ ＆ Ａｓｓｏｃｉａｔｅｓ， Ｉｎｃｏｒｐｏｒａｔｅｄ 支持型エラストマー発泡体及び支持型エラストマー発泡体を製造する方法
WO2021210435A1 (fr) * 2020-04-15 2021-10-21 株式会社バルカー Matériau d'étanchéité

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008007607A (ja) * 2006-06-28 2008-01-17 Nippon Valqua Ind Ltd 充填材入りフッ素樹脂シートおよび充填材入りフッ素樹脂シートの製造方法
JP2011153254A (ja) * 2010-01-28 2011-08-11 Nippon Valqua Ind Ltd シート形成用組成物、充填材入りフッ素樹脂シートおよび充填材入りフッ素樹脂シートの製造方法
JP2020524096A (ja) * 2017-06-15 2020-08-13 ダブリュ．エル．ゴア アンド アソシエイツ，インコーポレイティドＷ．Ｌ． Ｇｏｒｅ ＆ Ａｓｓｏｃｉａｔｅｓ， Ｉｎｃｏｒｐｏｒａｔｅｄ 支持型エラストマー発泡体及び支持型エラストマー発泡体を製造する方法
WO2021210435A1 (fr) * 2020-04-15 2021-10-21 株式会社バルカー Matériau d'étanchéité

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