GB1476272A - Sintered particles of tetrafluoroethylene polymers and process for their preparation - Google Patents

Sintered particles of tetrafluoroethylene polymers and process for their preparation

Info

Publication number
GB1476272A
GB1476272A GB764275A GB764275A GB1476272A GB 1476272 A GB1476272 A GB 1476272A GB 764275 A GB764275 A GB 764275A GB 764275 A GB764275 A GB 764275A GB 1476272 A GB1476272 A GB 1476272A
Authority
GB
United Kingdom
Prior art keywords
polymer
particles
dispersion
sintered particles
sintering temperature
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.)
Expired
Application number
GB764275A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chemours Mitsui Fluoroproducts Co Ltd
Original Assignee
Mitsui Fluorochemicals Co Ltd
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 Mitsui Fluorochemicals Co Ltd filed Critical Mitsui Fluorochemicals Co Ltd
Publication of GB1476272A publication Critical patent/GB1476272A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • 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
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
    • 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
    • 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

Abstract

1476272 Sintered particles of tetrafluoroethylene polymer MITSUI FLUOROCHEMICALS CO Ltd 24 Feb 1975 [26 Feb 1974] 7642/75 Heading C3C Sintered particles of a non-melt-fabricable tetrafluoroethylene polymer (i.e. having a melt viscosity at 380‹ C. of at least 1 x 10<SP>9</SP> poises) prepared by aq. dispersion polymerization and having an average particle size of 5-500 microns, a sphere factor (as defined) of 1À0-1À2 and containing at least one enclosed void which causes the particles to have a precipitation rate in trichloroethylene (as defined) of no greater than 20% are claimed. The sintered particles are made by (a) atomizing an aq. dispersion obtained from the aq. dispersion polymerization of tetrafluoroethylene and containing (i) 5-80% by wt. of unsintered non- melt-fabricable particles of the polymer, of average particle size 0À05-0À5 micron, (ii) 0À2-20% by wt. of the particles of a non- ionic or anionic surfactant having a b.p. less than the polymer sintering temperature and (iii) 0À2-20% by wt. of either a liquid foaming agent having a b.p. below the polymer sintering temperature and a water solubility of 15 gm./100 ml. or less at 25‹ C., or a solid foaming agent which decomposes at a temperature below the polymer sintering temperature, (b) heating the atomized dispersion at above the polymer sintering temperature in an inert atmosphere, (c) cooling the sintered particles below the polymer sintering temperature, and (d) recovering the sintered particles. In the examples mixtures of a non-ionic surfactant or dodecyl benzene sulphonate, water and trichloro-trifluoro-ethane, propyl ether, ammonium carbonate or petroleum ether were emulsified, optionally with an ultrasonic wave generator and added to an aqueous dispersion of polytetrafluoroethylene or a copolymer of tetrafluoroethylene and hexafluoropropylene, and the mixture was placed in tank 1 of Fig. 1 from which it was fed to a binary fluid nozzle 5 where it was atomized at outlet 6 with air from compressor 3 and sent via pipe 4 to nozzle 5. The atomized dispersion emerges into sintering chamber 9 where heated air from 7 enters via pipe 8 and foams the drops of the dispersion and sinters the polymer particles which are then cooled in 10 by cool air from pipe 11. The sintered particles are then sent to cyclone 12 and recovered in receiver 20.
GB764275A 1974-02-26 1975-02-24 Sintered particles of tetrafluoroethylene polymers and process for their preparation Expired GB1476272A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2189674A JPS5313229B2 (en) 1974-02-26 1974-02-26

Publications (1)

Publication Number Publication Date
GB1476272A true GB1476272A (en) 1977-06-10

Family

ID=12067861

Family Applications (1)

Application Number Title Priority Date Filing Date
GB764275A Expired GB1476272A (en) 1974-02-26 1975-02-24 Sintered particles of tetrafluoroethylene polymers and process for their preparation

Country Status (7)

Country Link
JP (1) JPS5313229B2 (en)
CA (1) CA1050719A (en)
DE (1) DE2508361C2 (en)
FR (1) FR2262069B1 (en)
GB (1) GB1476272A (en)
IT (1) IT1033208B (en)
NL (1) NL180395C (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2242431A (en) * 1990-03-31 1991-10-02 Gore & Ass Porous PTFE structures
US5677031A (en) * 1990-03-31 1997-10-14 W. L. Gore & Associates, Inc. Porous PTFE structures
EP1059333A1 (en) * 1998-02-24 2000-12-13 Asahi Glass Fluoropolymers Co., Ltd. Aqueous polytetrafluoroethylene dispersion composition
EP1246875A1 (en) * 1999-12-02 2002-10-09 Lexmark International, Inc. Wet rub resistant ink compositions
CN113146881A (en) * 2020-09-07 2021-07-23 江西理工大学南昌校区 Polymer powder spheroidizing device and method for preparing spherical powder material

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996021700A1 (en) * 1995-01-09 1996-07-18 W.L. Gore & Associates, Inc. Lightweight hardened protective coating and method for making and using same

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2242431A (en) * 1990-03-31 1991-10-02 Gore & Ass Porous PTFE structures
GB2242431B (en) * 1990-03-31 1994-05-11 Gore & Ass Porous PTFE structures
US5677031A (en) * 1990-03-31 1997-10-14 W. L. Gore & Associates, Inc. Porous PTFE structures
EP1059333A1 (en) * 1998-02-24 2000-12-13 Asahi Glass Fluoropolymers Co., Ltd. Aqueous polytetrafluoroethylene dispersion composition
EP1059333A4 (en) * 1998-02-24 2002-01-30 Asahi Glass Fluoropolymers Co Aqueous polytetrafluoroethylene dispersion composition
US6498207B1 (en) 1998-02-24 2002-12-24 Asahi Glass Fluoropolymers Co. Ltd. Aqueous polytetrafluoroethylene dispersion composition
EP1359194A1 (en) * 1998-02-24 2003-11-05 Asahi Glass Fluoropolymers Co., Ltd. Polytetrafluoroethylene aqueous dispersion composition
EP1246875A1 (en) * 1999-12-02 2002-10-09 Lexmark International, Inc. Wet rub resistant ink compositions
EP1246875A4 (en) * 1999-12-02 2005-12-14 Lexmark Int Inc Wet rub resistant ink compositions
CN113146881A (en) * 2020-09-07 2021-07-23 江西理工大学南昌校区 Polymer powder spheroidizing device and method for preparing spherical powder material

Also Published As

Publication number Publication date
DE2508361A1 (en) 1975-08-28
JPS50114447A (en) 1975-09-08
NL180395B (en) 1986-09-16
NL180395C (en) 1987-02-16
NL7502295A (en) 1975-08-28
FR2262069B1 (en) 1979-03-02
IT1033208B (en) 1979-07-10
CA1050719A (en) 1979-03-20
JPS5313229B2 (en) 1978-05-09
FR2262069A1 (en) 1975-09-19
DE2508361C2 (en) 1985-04-11

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee