GB1104139A - Polytetrafluoroethylene resin sheets and films and process for their production - Google Patents

Polytetrafluoroethylene resin sheets and films and process for their production

Info

Publication number
GB1104139A
GB1104139A GB1954966A GB1954966A GB1104139A GB 1104139 A GB1104139 A GB 1104139A GB 1954966 A GB1954966 A GB 1954966A GB 1954966 A GB1954966 A GB 1954966A GB 1104139 A GB1104139 A GB 1104139A
Authority
GB
United Kingdom
Prior art keywords
sheet
film
final
filler
rolls
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
GB1954966A
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB1104139A publication Critical patent/GB1104139A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/18—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets by squeezing between surfaces, e.g. rollers
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (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)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

Polytetrafluoroethylene films and sheets having planar orientation, as characterized by an A X-ray ratio of 1 to 0.4 and a B X-ray ratio of 0.7 to 0.05, and having a melting point above 340 DEG C., may be produced by (a) passing the charge through the nip of at least one pair of heated nip rolls to form a flat sheet; (b) folding the sheet so formed back on itself in the direction of rolling; (c) passing the folded sheet through the nip of at least one pair of heated nip rolls in a direction of from 30 to 90 degrees transverse to the previous rolling direction; and (d) repeating steps (b) and (c) a sufficient number of times to obtain a final sheet or film of the desired thickness and orientation and to impart to the sheet or film a melting point above 340 DEG C., at least the final rollings being conducted through rolls maintained at a temperature of at least 50 DEG C. The rolls may be maintained at a temperature of at least 120 DEG C. during the final rollings. The sheet or film finally produced may be treated at a temperature below the melting point of the sheet or film and not higher than 340 DEG C. to prevent subsequent delamination of the sheet. The particulate polymer may be blended with up to 90% by volume of a particulate solid filler prior to being hot rolled. The blending may be effected in the presence of a volatilizable hydrocarbon liquid (which in this case functions as a lubricant) to form a slurry from which most of the hydrocarbon liquid is filtered off. The filler may be a substance which can be dissolved out of the final sheet or film by means of a solvent for the filler but not for the polymer so that the final film or sheet is thereby rendered porous. The filler may be finely divided sodium chloride and the salt and the particulate polymer may be mixed in the presence of four volumes of Stoddard solvent which is then filtered off from the mixture. The final sheet or film may then be leached in warm water containing a detergent for several days to dissolve out the salt and subsequently washed with hot water containing a detergent.
GB1954966A 1965-05-03 1966-05-03 Polytetrafluoroethylene resin sheets and films and process for their production Expired GB1104139A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US45285265A 1965-05-03 1965-05-03

Publications (1)

Publication Number Publication Date
GB1104139A true GB1104139A (en) 1968-02-21

Family

ID=23798218

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1954966A Expired GB1104139A (en) 1965-05-03 1966-05-03 Polytetrafluoroethylene resin sheets and films and process for their production

Country Status (3)

Country Link
DE (1) DE1629587A1 (en)
GB (1) GB1104139A (en)
NL (1) NL6605980A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997032714A1 (en) * 1996-03-08 1997-09-12 Baxter International Inc. Multiaxially oriented fluoropolymer films and methods of manufacture therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997032714A1 (en) * 1996-03-08 1997-09-12 Baxter International Inc. Multiaxially oriented fluoropolymer films and methods of manufacture therefor
US6099791A (en) * 1996-03-08 2000-08-08 Baxter International Inc. Methods of manufacture of multiaxially oriented fluoropolymer films

Also Published As

Publication number Publication date
NL6605980A (en) 1966-11-04
DE1629587A1 (en) 1971-02-04

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