TITLE: Thin transparent polytetrafluoroethylene film and production process
thereof.
European Patent Application EP0157180 A2

ABSTRACT:
Abstract not available for EP0157180
Abstract of corresponding document: US4650833
Disclosed herein is a thin transparent polytetrafluoroethylene film
having: (1) a film thickness of 0.1-100 mu m; (2) a parallel light
transmittance of at least 70% (as measured in accordance with JIS K
7105); and (3) a tensile strength of at least 1 kg/mm2 (as measured in
accordance with JIS K 6887 except for the use of a pulling speed of 10
mm/min.). The film is produced by fluorinating with a fluorine gas a
thin film formed from a solution of a fluoroethylene polymer having an
inherent viscosity of at least 2.5 dl/g (as measured at a temperature
of 30 DEG C. and a solution concentration of 0.4 g/dl) in accordance
with the casting process and having a thickness of 0.1-100 mu m.

INVENTORS:
Sakagami, Teruo
Arakawa, Noriyuki
Murayama, Naohiro

APPLICATION NUMBER: EP19850102267
PUBLICATION DATE: 10/09/1985
FILING DATE: 02/28/1985

ASSIGNEE: KUREHA CHEMICAL IND CO LTD (JP)
INTERNATIONAL CLASSES: C08F14/22; C08F14/26; C08F114/26; C08F214/22; C08F214/26; C08J5/18;
C08J7/12; (IPC1-7): C08J7/12; C08J5/18; C08L27/12
EUROPEAN CLASSES: C08J5/18+L27/18; C08J7/12F+L27/12

FOREIGN REFERENCES:
FR1287602A
GB845634A

OTHER REFERENCES:
CHEMICAL ABSTRACTS, vol. 93, no. 22, 1st December 1980, pages 58,59,
abstract no. 205822m, Columbus, Ohio, US; & JP-A-55 092 743 (ASAHI
GLASS CO. LTD.) 14-07-1980
DIE MAKROMOLEKULARE CHEMIE, Rapid Communications, vol. 5, no. 9,
September 1984, pages 611-613, H}thig & Wepf Verlag, Basel, CH; G.G.
SCHERER et al.: "Elemental fluorination of poly(vinylidene fluoride)"