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
United Kingdom
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
Farbwerke 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
Application filed by Hoechst AG, Farbwerke Hoechst AG filed Critical Hoechst AG
Publication of GB1240883A publication Critical patent/GB1240883A/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
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • 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
    • C08J2327/14—Homopolymers 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)

Applications Claiming Priority (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 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 (8)

Country Link
BE (1) BE722281A (en)
CA (1) CA918365A (en)
CH (1) CH480158A (en)
ES (1) ES359004A1 (en)
FR (1) FR1589529A (en)
GB (1) GB1240883A (en)
NL (1) NL6814336A (en)
SE (1) SE344902B (en)

Cited By (3)

* 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
CN113844141A (en) * 2021-09-23 2021-12-28 上海索康医用材料有限公司 Expanded polytetrafluoroethylene surgical isolating membrane and manufacturing process thereof

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 METHOD FOR PRODUCING THERMOPLASTIC PLASTIC FILMS OR PLASTIC FILMS CONTAINING FILLERS.

Cited By (4)

* 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
CN113844141A (en) * 2021-09-23 2021-12-28 上海索康医用材料有限公司 Expanded polytetrafluoroethylene surgical isolating membrane and manufacturing process thereof
CN113844141B (en) * 2021-09-23 2023-09-15 上海索康医用材料有限公司 Expanded polytetrafluoroethylene surgical isolation membrane and manufacturing process thereof

Also Published As

Publication number Publication date
NL6814336A (en) 1969-04-15
SE344902B (en) 1972-05-08
CA918365A (en) 1973-01-09
ES359004A1 (en) 1970-07-01
FR1589529A (en) 1970-03-31
CH480158A (en) 1969-10-31
BE722281A (en) 1969-04-14

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