GB1076852A - Non-fibrous polytetrafluoroethylene granular powder and a process for the production thereof - Google Patents

Non-fibrous polytetrafluoroethylene granular powder and a process for the production thereof

Info

Publication number
GB1076852A
GB1076852A GB2899664A GB2899664A GB1076852A GB 1076852 A GB1076852 A GB 1076852A GB 2899664 A GB2899664 A GB 2899664A GB 2899664 A GB2899664 A GB 2899664A GB 1076852 A GB1076852 A GB 1076852A
Authority
GB
United Kingdom
Prior art keywords
granular powder
prepared
production
less
polytetrafluoroethylene granular
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
GB2899664A
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.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
Daikin Kogyo 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 Daikin Industries Ltd, Daikin Kogyo Co Ltd filed Critical Daikin Industries Ltd
Publication of GB1076852A publication Critical patent/GB1076852A/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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F14/00—Homopolymers and 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
    • C08F14/18—Monomers containing fluorine
    • C08F14/26—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
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/12—Powdering or granulating
    • C08J3/124—Treatment for improving the free-flowing characteristics
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)

Abstract

Non-fibrous polytetrafluoroethylene granular powder characterized by a wet-sieve size of less than 40 microns, a shape factor of less than 15, an anisotropic expansion factor in the range 1.02 to 1.26 and a surface smoothness of more than 15 seconds may be prepared by pulverizing coarse polytetrafluoroethylene particles at temperature below 330 DEG C. chiefly by collision force. The polymer may be prepared by polymerizing tetrafluoroethylene in the gas phase at 3 to 10 kg./cm.2 at a temperature of 0 DEG to 40 DEG C. in the presence of water containing a polymerization initiator, e.g. ammonium persulphate, sodium bisulphite and ferrous sulphate. The powders may be moulded and sintered to form dense, non-porous articles.
GB2899664A 1963-07-15 1964-07-14 Non-fibrous polytetrafluoroethylene granular powder and a process for the production thereof Expired GB1076852A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3605563 1963-07-15

Publications (1)

Publication Number Publication Date
GB1076852A true GB1076852A (en) 1967-07-26

Family

ID=12459014

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2899664A Expired GB1076852A (en) 1963-07-15 1964-07-14 Non-fibrous polytetrafluoroethylene granular powder and a process for the production thereof

Country Status (2)

Country Link
DE (1) DE1454783A1 (en)
GB (1) GB1076852A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3726483A (en) * 1970-12-30 1973-04-10 Daikin Ind Ltd Process the preparation of ultra-fine polytetrafluoroethylene molding powder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3726483A (en) * 1970-12-30 1973-04-10 Daikin Ind Ltd Process the preparation of ultra-fine polytetrafluoroethylene molding powder

Also Published As

Publication number Publication date
DE1454783A1 (en) 1969-08-14

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