| 摘要 |
PROBLEM TO BE SOLVED: To provide a tetrafluoroethylene copolymer excellent in resistance to flexural fatigue. SOLUTION: This tetrafluoroethylene copolymer contains repeating units (a) based on tetrafluoroethylene and repeating units (b) based on a compound: CF<SB>2</SB>=CFOCF<SB>2</SB>CF<SB>2</SB>CF<SB>2</SB>CF<SB>3</SB>, wherein the copolymer has a mol ratio (a)/(b) of 90/10 to 99.8/0.2 and a volumetric flow rate at 380°C of 0.1-1000 mm<SP>3</SP>/sec. The tetrafluoroethylene/CF<SB>2</SB>=CFOCF<SB>2</SB>CF<SB>2</SB>CF<SB>2</SB>CF<SB>3</SB>copolymer which has the mol ratio (a)/(b) of 98.5/1.5 and the volumetric flow rate at 380°C of 4.8 mm<SP>3</SP>/sec is, for example, provided. COPYRIGHT: (C)2006,JPO&NCIPI
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