GB1428838A - Polytetrafluoroethylene granular powder and process for preparing the same - Google Patents

Polytetrafluoroethylene granular powder and process for preparing the same

Info

Publication number
GB1428838A
GB1428838A GB3520973A GB3520973A GB1428838A GB 1428838 A GB1428838 A GB 1428838A GB 3520973 A GB3520973 A GB 3520973A GB 3520973 A GB3520973 A GB 3520973A GB 1428838 A GB1428838 A GB 1428838A
Authority
GB
United Kingdom
Prior art keywords
microns
particles
ptfe
granular
less
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
GB3520973A
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 GB1428838A publication Critical patent/GB1428838A/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
    • 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

Abstract

1428838 PTFE particles DAIKIN KOGYO CO Ltd 24 July 1973 [29 July 1972] 35209/73 Heading C3P Granular PTFE particles consisting of agglomerates of primary particles of size below 200 microns have more than 90% of granular particles less than 1000 microns, an average particle size in the range 100-500 microns with more than 60% of the granular material having particle sizes of 0À7-1À3 times the average and with a flowability (defined) more than 3 while on moulding giving an article having a surface roughness less than 2À0 are obtained by agglomerating PTFE powder particles having an average particle size below 200 microns by agitating in 150-5000% by wt. of the PTFE of an aqueous medium consisting of more than 130% of water and 20-300% of an organic liquid incompatible with water and having a surface tension less than 35 dynes/cm, at 25‹ C. and subsequently, simultaneously or alternately crushing to reduce overlarge agglomerates. The organic liquid may be a hydrocarbon, halogenated hydrocarbon or ether; in the examples are used carbon tetrachloride, agglomeration being effected with stirring.
GB3520973A 1972-07-29 1973-07-24 Polytetrafluoroethylene granular powder and process for preparing the same Expired GB1428838A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7607672A JPS568044B2 (en) 1972-07-29 1972-07-29

Publications (1)

Publication Number Publication Date
GB1428838A true GB1428838A (en) 1976-03-17

Family

ID=13594704

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3520973A Expired GB1428838A (en) 1972-07-29 1973-07-24 Polytetrafluoroethylene granular powder and process for preparing the same

Country Status (3)

Country Link
JP (1) JPS568044B2 (en)
DE (1) DE2338285B2 (en)
GB (1) GB1428838A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2404015A1 (en) * 1977-09-21 1979-04-20 Du Pont PERFECTED PROCESS FOR PREPARATION OF AGGLOMERATED PARTICLES OF GRANULAR POLYMER AND TETRAFLUOROETHYLENE
EP1000961A1 (en) * 1997-08-01 2000-05-17 Daikin Industries, Ltd. Process for producing granular polytetrafluoroethylene powder
EP1449866A1 (en) * 2001-10-24 2004-08-25 Daikin Industries, Ltd. Ptfe powder and method for producing ptfe powder for molding
US7803889B2 (en) * 2003-02-28 2010-09-28 Daikin Industries, Ltd. Granulated powder of low-molecular polytetrafluoro-ethylene and powder of low-molecular polytetrafluoro-ethylene and processes for producing both

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19547909A1 (en) * 1995-12-21 1997-06-26 Dyneon Gmbh Process for post-treatment of thermoplastic fluoropolymers

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB638328A (en) * 1946-12-07 1950-06-07 Du Pont Moulding powders comprising fluorine-containing polymers
FR1307128A (en) * 1960-11-30 1962-10-19 Du Pont Molding powder manufacturing process
US3115486A (en) * 1960-11-30 1963-12-24 Du Pont Process for the preparation of polytetrafluoroethylene molding powder
DE1745937C3 (en) * 1963-09-09 1973-12-20 E.I. Du Pont De Nemours And Co., Wilmington, Del. (V.St.A.) Polytetrafluorethylene molding powder and process for its production
US3265679A (en) * 1963-09-19 1966-08-09 Pennsalt Chemicals Corp Chemical product and method for its manufacture
GB1100388A (en) * 1964-05-18 1968-01-24 Daikin Ind Ltd Polytetrafluoroethylene powder and method of preparation thereof
US3366615A (en) * 1964-09-16 1968-01-30 Allied Chem Method for agglomerating granular polytetrafluoroethylene
DE1669830A1 (en) * 1967-03-09 1971-07-01 Huels Chemische Werke Ag Process for improving the adhesive properties of unvulcanized elastomers and their mixtures
US3690569A (en) * 1970-09-24 1972-09-12 Du Pont Granular polytetrafluoroethylene of good moldability and apparent bulk density
JPS5221011A (en) * 1975-08-09 1977-02-17 Ibigawa Electric Ind Co Ltd Method of manufacturing carbon products

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2404015A1 (en) * 1977-09-21 1979-04-20 Du Pont PERFECTED PROCESS FOR PREPARATION OF AGGLOMERATED PARTICLES OF GRANULAR POLYMER AND TETRAFLUOROETHYLENE
EP1000961A1 (en) * 1997-08-01 2000-05-17 Daikin Industries, Ltd. Process for producing granular polytetrafluoroethylene powder
EP1000961A4 (en) * 1997-08-01 2000-09-20 Daikin Ind Ltd Process for producing granular polytetrafluoroethylene powder
EP1449866A1 (en) * 2001-10-24 2004-08-25 Daikin Industries, Ltd. Ptfe powder and method for producing ptfe powder for molding
EP1449866A4 (en) * 2001-10-24 2007-04-11 Daikin Ind Ltd Ptfe powder and method for producing ptfe powder for molding
US8247506B2 (en) 2001-10-24 2012-08-21 Daiken Industries, Ltd. PTFE powder and method of producing PTFE molding powders
US7803889B2 (en) * 2003-02-28 2010-09-28 Daikin Industries, Ltd. Granulated powder of low-molecular polytetrafluoro-ethylene and powder of low-molecular polytetrafluoro-ethylene and processes for producing both

Also Published As

Publication number Publication date
DE2338285C3 (en) 1991-10-02
DE2338285A1 (en) 1974-02-14
JPS568044B2 (en) 1981-02-21
DE2338285B2 (en) 1980-02-28
JPS4933943A (en) 1974-03-28

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19920724