GB1240883A - Films of polytetrafluorethylene and process for making them - Google Patents

Films of polytetrafluorethylene and process for making them

Info

Publication number
GB1240883A
GB1240883A GB4855268A GB4855268A GB1240883A GB 1240883 A GB1240883 A GB 1240883A GB 4855268 A GB4855268 A GB 4855268A GB 4855268 A GB4855268 A GB 4855268A GB 1240883 A GB1240883 A GB 1240883A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
film
roll
sintering
tension
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
GB4855268A
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.)
Hoechst AG
Original Assignee
Hoechst AG
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

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J5/00Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18Manufacture of films or sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00Flat articles, e.g. films or sheets
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J2327/00Characterised 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
    • C08J2327/02Characterised 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
    • C08J2327/12Characterised 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
    • C08J2327/14Homopolymers or copolymers of vinyl fluoride

Abstract

1,240,883. Making polytetrafluoroethylene films. FARBWERKE HOECHST A.G. 14 Oct., 1968 [13 Oct., 1967; 12 Dec., 1967: 29 Dec., 1967], No. 48552/68. Heading B5B. Polytetrafluoroethylene film is manufactured by rolling pulverulent P.T.F.E. between rolls at a temperature within the range of from 100‹ to 325‹ C. to form a film and sintering the film at a temperature within the range of from 327‹ to 400‹ C., and preferably at a temperature of 350‹ C. The sintering step may be carried out continuously or discontinuously. In the former case the film is subjected to tension in the transverse direction. This tension may be applied at a moment at which sintering has reached such an extent that the tensile strength of the film in the transverse direction which has been increased by sintering are just sufficient to allow the film to be subjected to a transverse tension without the film tearing apart. The tension may be sufficient to stretch the film in the transverse direction. The film or sheet may be drawn in the longitudinal direction or in both the longitudinal and transverse directions. The film which has been preformed by the rolling step may be pressed by a travelling endless metal band with as large a wrapping angle as possible against a roll, the roll being maintained at the desired sintering temperature. The film may be in contact with the heated roll for about 20 seconds. As shown in the drawing, the unsintered preformed film of P.T.F.E. (1) may be conducted via a pressing roll (2) together with a travelling endless metal band (3) over a rotating roll 4 maintained at the sintering temperature and the film (1) thereby sintered is drawn off by the roll (5) and wound up. The endless metal band is kept under tension by the rolls 2, 5 and 6 and a fourth roll (unnumbered). When the sintering step is carried out discontinuously, the preformed film is coated on at least one side with an anti-blocking agent such as a powdered silicate, a liquid silicone or an inorganic carbonate), wound up to form a roll and then sintered.
GB4855268A 1967-10-13 1968-10-14 Films of polytetrafluorethylene and process for making them Expired GB1240883A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DEF0053763 1967-10-13
DEF0054288 1967-12-12
DEF0054444 1967-12-29

Publications (1)

Publication Number Publication Date
GB1240883A true true GB1240883A (en) 1971-07-28

Family

ID=27210547

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4855268A Expired GB1240883A (en) 1967-10-13 1968-10-14 Films of polytetrafluorethylene and process for making them

Country Status (6)

Country Link
BE (1) BE722281A (en)
CA (1) CA918365A (en)
ES (1) ES359004A1 (en)
FR (1) FR1589529A (en)
GB (1) GB1240883A (en)
NL (1) NL6814336A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5118788A (en) * 1990-05-14 1992-06-02 Daikin Industries Ltd. Process for preparing polytetrafluoroethylene powder
US6436135B1 (en) 1974-10-24 2002-08-20 David Goldfarb Prosthetic vascular graft

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3485470D1 (en) * 1983-10-05 1992-03-05 Nippon Petrochemicals Co Ltd A process for producing filler-containing thermoplastic plastic films or plastic films.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6436135B1 (en) 1974-10-24 2002-08-20 David Goldfarb Prosthetic vascular graft
US5118788A (en) * 1990-05-14 1992-06-02 Daikin Industries Ltd. Process for preparing polytetrafluoroethylene powder

Also Published As

Publication number Publication date Type
FR1589529A (en) 1970-03-31 grant
NL6814336A (en) 1969-04-15 application
CA918365A (en) 1973-01-09 grant
CA918365A1 (en) grant
ES359004A1 (en) 1970-07-01 application
BE722281A (en) 1969-04-14 grant

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