Patent ID: 7361717
Filing Date: 2008-04-22
Classification: C08F,C08J

Abstract:
1. A method of preparing a fluorocopolymer film, comprising: molding a fluorocopolymer at a molding temperature of at most 320° C. to obtain the fluorocopolymer film, wherein: the fluorocopolymer comprises repeating units based on ethylene, repeating units based on tetrafluoroethylene, repeating units based on hexafluoropropylene and repeating units based on a fluoroalkyl vinyl ether represented by CF 2 ═CFOR f (wherein R f represents a C 1-10 fluoroalkyl group), a molar ratio of the repeating units based on ethylene to the repeating units based on tetrafluoroethylene in the fluorocopolymer is from 10/90 to 60/40; a content of the repeating units based on hexafluoropropylene to the total repeating units in the fluorocopolymer is from 0.1 to 20 mol %; a content of the repeating units based on fluoroalkyl vinyl ether to the total repeating units in the fluorocopolymer is from 0.1 to 10 mol %; the fluorocopolymer has a volumetric flow rate of from 0.1 to 30 mm