US20050010007A1 - Ptfe powder and method of producing ptfe powder for molding - Google Patents

Ptfe powder and method of producing ptfe powder for molding Download PDF

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Publication number
US20050010007A1
US20050010007A1 US10/493,762 US49376204A US2005010007A1 US 20050010007 A1 US20050010007 A1 US 20050010007A1 US 49376204 A US49376204 A US 49376204A US 2005010007 A1 US2005010007 A1 US 2005010007A1
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US
United States
Prior art keywords
powder
ptfe
measurement
molded articles
polytetrafluoroethylene
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
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US10/493,762
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English (en)
Inventor
Massayuki Tsuji
Michio Asano
Masamichi Sukegawa
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Daikin Industries Ltd
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Daikin Industries Ltd
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Filing date
Publication date
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Assigned to DAIKIN INDUSTRIES, LTD. reassignment DAIKIN INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ASANO, MICHIO, SUKEGAWA, MASAMICHI, TSUJI, MASAYUKI
Publication of US20050010007A1 publication Critical patent/US20050010007A1/en
Priority to US12/101,064 priority Critical patent/US8247506B2/en
Abandoned legal-status Critical Current

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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
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/12—Powdering or granulating
    • C08J3/122—Pulverisation by spraying
    • 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
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/12—Powdering or granulating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08L27/18—Homopolymers or copolymers or tetrafluoroethene
    • 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
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]

Definitions

  • That no substantial fibril-formation occurs with the particles obtained by the above pulverization can also be demonstrated, for example, by electron photomicrographic observation of the particles obtained, which indicates no substantial protrusion of fiber-like pieces on the particle surface and the smoothly curved surface of the particles.
  • the anionic surfactant to be used in the above emulsification/dispersion granulation method includes, for example, higher alcohol sulfate ester salts such as sodium lauryl sulfate; and a fluorine-containing-carboxylic-acid based or fluorine-containing-sulfonic-acid-based anionic surfactants having a fluoroalkyl or chlorofluoroalkyl group(s).
  • the PTFE powder of the present invention may contain one or more fillers, such as reinforcing agents; additives and so forth each in an appropriate amount, according to need.
  • the PTFE powder of the present invention is not particularly restricted but may be any one having the above-defined physical characteristics of moldings or the above-defined physical characteristics of moldings and powder characteristics.
  • the PTFE-based polymer be the above-mentioned not-modified PTFE and that the unpulverized PTFE powder of the PTFE-based polymer having an amorphous index (AI) of not less than 0.25 be subjected to the above-mentioned pulverization.
  • AI amorphous index
  • the average particle diameter of the above PTFE powder (II) is not particularly restricted but may be, for example, not greater than 60 ⁇ m, generally 1 to 25 ⁇ m. When it is within the above range, moldings excellent in tensile strength, tensile elongation and/or high-voltage insulation properties can be obtained with ease.
  • the PTFE powder of the present invention is not particularly restricted but may be any powder solid having such physical characteristics of moldings or such molding characteristics and powder characteristics as mentioned above.
  • the physical characteristics of moldings are excellent and, in particular, in the case of the above-mentioned PTFE powder (I), PTFE powder (II) or PTFE powder (III), very good physical characteristics of moldings can be obtained.
  • the PTFE powder of the present invention is characterized in that a surface roughness Ra of molded articles a1 for measurement is less than 0.92 ⁇ m.
  • the PTFE powder of the present invention which has such a feature is referred to as “PTFE powder (1)”.
  • PTFE powder (1) When the surface roughness Ra is within the above range, moldings excellent in surface smoothness can be obtained. Such a surface roughness Ra within the above range has never been obtained with the conventional PTFE powders.
  • a surface roughness of molded articles a1 for measurement is preferably less than 0.8 ⁇ m.
  • Preferred as such PTFE powder (1) are the PTFE powder (I) with an average particle diameter of 1 to 25 ⁇ m, and the PTFE powder (I′) with an average particle diameter of 20 to 60 ⁇ m.
  • an apparent density is not lower than 0.45 g/cm 3 and a dielectric breakdown voltage of molded articles a2 for measurement is not lower than 12 kV, or an apparent density is not lower than 0.5 g/cm 3 and a dielectric breakdown voltage of molded articles a2 for measurement is not lower than 9.1 kV. Desirable is the latter case.
  • the PTFE powder (6) can be properly used without being particularly restricted, for example, for producing the moldings required to show high levels of dielectric breakdown voltage and high levels of powder flowability for productivity enhancement, for example in molding insulating tapes, insulated nozzles and so forth.
  • the PTFE powder of the present invention is characterized in that a surface roughness Ra of molded articles a1 for measurement is not less than 0.92 ⁇ m and a dielectric breakdown voltage of molded articles a2 for measurement is not lower than 10 kV.
  • the PTFE powder of the present invention which has such features is referred to as “PTFE powder (16)”.
  • an apparent density is not lower than 0.6 g/cm 3
  • a surface roughness of molded articles a1 for measurement is less than 2.5 ⁇ m
  • a dielectric breakdown voltage of molded articles a2 for measurement is not lower than 8.5 kV.
  • the above freeze air jet pulverization can be carried out by using such a freeze air jet pulverizer as mentioned above, for instance.
  • the freeze air jet pulverization method may comprise, for example, pulverizing the resin particles frozen by feeding them to the pulverizer together with a liquefied gas, such as liquefied nitrogen, by emitting jets of compressed air in the same manner as in the air jet pulverization method described above.
  • the average particle diameter after the above granulation is the value obtained by the same method as described above referring to the PTFE powder of the present invention, namely the method of determining the average particle diameter of a granular powder as described in WO 98/41569.
  • the surface roughness Ra is expressed in terms of the value measured with the molded articles a1 for measurement
  • the dielectric breakdown voltage is expressed in terms of the value measured with the molded articles a2 for measurement
  • the tensile strength and tensile elongation are expressed in terms of the values respectively measured with the molded articles a3 for measurement, as mentioned hereinabove.
  • the above-mentioned molded articles a1 for measurement, molded articles a2 for measurement and molded articles a3 for measurement are prepared by using the above-mentioned PTFE molding powder as the PTFE powder in the methods of measurement of the respective physical characteristics of moldings.
  • the above surface roughness Ra can be reduced to a level lower than 0.8 ⁇ m and the dielectric breakdown voltage can be increased to 12 kV or a higher level.
  • Preferred as the PTFE molding powder capable of providing such characteristics is the PTFE molding powder (I) with an average particle diameter of 1-25 ⁇ m.
  • the above-mentioned PTFE molding powder can provide molded articles a3 for measurement having a tensile elongation of not less than 370%, for instance, so that the moldings obtained from the PTFE molding powder can generally show a high elongation upon application of a tensile force thereto and, therefore, they are prevented from being broken even when a tensile force is applied thereto on the occasion of mounting thereof on machines, tools and so forth or processing thereof.
  • the above tensile elongation can amount preferably to 450% or above, more preferably to 500% or above, and can be adjusted within the above range according to the intended use. If it is within the above range, the tensile elongation may be not more than 650%, for example 630% or below.
  • the above PTFE molding powder can have an apparent density of not lower than 0.45 g/cm 3 , for instance.
  • the handleability thereof can be improved, like in the case of its being excellent in powder flowability.
  • the volume per unit weight as the molding powder can be reduced, so that it becomes possible to reduce the size of the mold or cylinder of the molding machine or to improve the productivity per mold or per cylinder.
  • a pulverized PTFE-based polymer with an average particle diameter of 42 ⁇ m was obtained by dry pulverization in the same manner as in Comparative Example 1 except that the PTFE powder (II) not reduced in size as obtained in Production Example 3 was used in lieu of the PTFE powder (I) not reduced in size.
  • Typical physical characteristics of the thus-obtained pulverized PTFE-based polymer were measured by the methods respectively described above. The results are shown in Table 2.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
US10/493,762 2001-10-24 2002-10-24 Ptfe powder and method of producing ptfe powder for molding Abandoned US20050010007A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/101,064 US8247506B2 (en) 2001-10-24 2008-04-10 PTFE powder and method of producing PTFE molding powders

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2001327018 2001-10-24
JP2001327017 2001-10-24
JP2001-327018 2001-10-24
JP2001-327017 2001-10-24
PCT/JP2002/011035 WO2003035724A1 (fr) 2001-10-24 2002-10-24 Poudre de ptfe, et procede de fabrication correspondant, aux fins de moulage

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/101,064 Division US8247506B2 (en) 2001-10-24 2008-04-10 PTFE powder and method of producing PTFE molding powders

Publications (1)

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US20050010007A1 true US20050010007A1 (en) 2005-01-13

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US10/493,762 Abandoned US20050010007A1 (en) 2001-10-24 2002-10-24 Ptfe powder and method of producing ptfe powder for molding
US12/101,064 Expired - Fee Related US8247506B2 (en) 2001-10-24 2008-04-10 PTFE powder and method of producing PTFE molding powders

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Country Status (5)

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US (2) US20050010007A1 (ja)
EP (3) EP1449866A4 (ja)
JP (2) JPWO2003035724A1 (ja)
CN (1) CN1575312A (ja)
WO (1) WO2003035724A1 (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
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US20070269575A1 (en) * 2004-08-25 2007-11-22 Cj Corporation Method for Untrafinely Pulverizing Oat Bran and a Beverage Composition Comprising an Extract Extracted from an Ultrafine Oat Bran Powder Obtained by the Method
US20080125548A1 (en) * 2005-11-30 2008-05-29 Daikin Industries, Ltd. Modified Polytetrafluoethylene Molded Article and Process for Manufacture Thereof
US20130137812A1 (en) * 2008-09-26 2013-05-30 Whitford Corporation Blended fluoropolymer compositions and coatings for flexible substrates
CN104437805A (zh) * 2014-12-02 2015-03-25 中昊晨光化工研究院有限公司 一种悬浮法聚四氟乙烯树脂的粉碎设备和粉碎方法
US20150197620A1 (en) * 2012-06-20 2015-07-16 Solvay Specialty Polymers Italy S.P.A. Tetrafluoroethylene copolymers
US20150315342A1 (en) * 2013-02-05 2015-11-05 Asahi Glass Company, Limited Process for producing polytetrafluoroethylene molding powder and process for producing polytetrafluoroethylene agglomerated product

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EP1449866A4 (en) 2001-10-24 2007-04-11 Daikin Ind Ltd PTFE POWDER AND CORRESPONDING PRODUCTION METHOD FOR MOLDING
JP5012027B2 (ja) * 2004-11-30 2012-08-29 ダイキン工業株式会社 変性ポリテトラフルオロエチレン成形体及びその製造方法
DE102006036203A1 (de) 2006-08-03 2008-02-07 Elringklinger Ag Verfahren zum Herstellen eines rieselfähigen Pulvers eines Fluorpolymer-Compounds und nach dem Verfahren hergestelltes rieselfähiges Pulver
DE102006036204A1 (de) 2006-08-03 2008-02-07 Elringklinger Ag Verfahren zum Herstellen eines rieselfähigen Pulvers eines Fluorpolymers und nach dem Verfahren hergestelltes rieselfähiges Pulver
JP5577590B2 (ja) * 2007-12-03 2014-08-27 ダイキン工業株式会社 成形体、ダイヤフラム弁、ダイヤフラムポンプ及びその製造方法
US9328256B2 (en) * 2012-04-13 2016-05-03 Xerox Corporation Reinforced fluoropolymer composites comprising surface functionalized nanocrystalline cellulose
CN104684648B (zh) * 2013-01-21 2017-08-04 聚合物粉末有限公司 用于聚合物材料的碎裂及活化的气体的利用和相关设备
NO3060347T3 (ja) * 2013-10-25 2018-03-31
CN104788622A (zh) * 2015-05-17 2015-07-22 福建师范大学泉港石化研究院 一种聚四氟乙烯粉末接枝改性的方法
CN112469545A (zh) * 2018-07-20 2021-03-09 大洋密封件 氟树脂成形体、医疗用隔膜、以及半导体用隔膜
JP6630932B1 (ja) * 2018-07-20 2020-01-15 Jasi株式会社 フッ素樹脂成形体、医療用ダイヤフラム、及び半導体用ダイヤフラム
US20210237315A1 (en) * 2018-07-20 2021-08-05 Taiyo Packing Co., Ltd. Molding method for fluororesin molded article, production method for medical diaphragm, and production method for diaphragm for semiconductor
KR102155660B1 (ko) * 2019-11-12 2020-09-15 (주)케맥스 배관 이음용 연결관
JPWO2022024520A1 (ja) * 2020-07-31 2022-02-03
WO2022211092A1 (ja) * 2021-03-31 2022-10-06 ダイキン工業株式会社 フッ素樹脂組成物、及び、成形体
WO2022211072A1 (ja) * 2021-03-31 2022-10-06 ダイキン工業株式会社 フッ素樹脂組成物、及び、成形体
TW202305054A (zh) * 2021-03-31 2023-02-01 日商大金工業股份有限公司 氟樹脂組成物、及成形體
EP4365223A1 (en) 2021-06-30 2024-05-08 Daikin Industries, Ltd. Method for producing polytetrafluoroethylene particles
EP4365222A1 (en) 2021-06-30 2024-05-08 Daikin Industries, Ltd. Method for producing polytetrafluoroethylene powder, and polytetrafluoroethylene powder
CN113999628B (zh) * 2021-11-04 2023-04-11 荣耀终端有限公司 绝缘胶、绝缘胶带及绝缘胶的制备方法

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070269575A1 (en) * 2004-08-25 2007-11-22 Cj Corporation Method for Untrafinely Pulverizing Oat Bran and a Beverage Composition Comprising an Extract Extracted from an Ultrafine Oat Bran Powder Obtained by the Method
US20080125548A1 (en) * 2005-11-30 2008-05-29 Daikin Industries, Ltd. Modified Polytetrafluoethylene Molded Article and Process for Manufacture Thereof
US7528221B2 (en) 2005-11-30 2009-05-05 Daikin Industries, Ltd. Modified polytetrafluoethylene molded article and process for manufacture thereof
US20130137812A1 (en) * 2008-09-26 2013-05-30 Whitford Corporation Blended fluoropolymer compositions and coatings for flexible substrates
US9090778B2 (en) * 2008-09-26 2015-07-28 Whitford Corporation Blended fluoropolymer compositions and coatings for flexible substrates
US20150197620A1 (en) * 2012-06-20 2015-07-16 Solvay Specialty Polymers Italy S.P.A. Tetrafluoroethylene copolymers
US10889699B2 (en) * 2012-06-20 2021-01-12 Solvay Specialty Polymers Italy S.P.A. Tetrafluoroethylene copolymers
US20150315342A1 (en) * 2013-02-05 2015-11-05 Asahi Glass Company, Limited Process for producing polytetrafluoroethylene molding powder and process for producing polytetrafluoroethylene agglomerated product
US9718930B2 (en) * 2013-02-05 2017-08-01 Asahi Glass Company, Limited Process for producing polytetrafluoroethylene molding powder and process for producing polytetrafluoroethylene agglomerated product
CN104437805A (zh) * 2014-12-02 2015-03-25 中昊晨光化工研究院有限公司 一种悬浮法聚四氟乙烯树脂的粉碎设备和粉碎方法

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JP5299348B2 (ja) 2013-09-25
EP1995270A2 (en) 2008-11-26
US8247506B2 (en) 2012-08-21
US20080199699A1 (en) 2008-08-21
CN1575312A (zh) 2005-02-02
JPWO2003035724A1 (ja) 2005-02-10
EP1995270B1 (en) 2018-06-06
EP1995269B1 (en) 2017-10-04
JP2010163629A (ja) 2010-07-29
EP1449866A1 (en) 2004-08-25
EP1449866A4 (en) 2007-04-11
EP1995269A2 (en) 2008-11-26
EP1995269A3 (en) 2009-03-04
EP1995270A3 (en) 2009-03-04

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