Fluorine-containing copolymer and molded article
A fluorocopolymer having tetrafluoroethylene [TFE]-derived copolymerized units and hexafluoropropylene [HFP]-derived copolymerized units, which has the following characteristics (a) and (b): (a) a thermal melting curve obtained by primary heating in differential scanning calorimetry shows a melting point within the range of 240 to 280° C. and a melting point peak portion area accounts for at least 60% of heats of fusion area; and (b) the product of a MFR (g/10 minutes) and a resin pressure (MPa) is not larger than 40.
1. A fluorocopolymer comprising tetrafluoroethylene [TFE]-derived copolymerized units and hexafluoropropylene [HFP]-derived copolymerized units, which has a following characteristics (a) and (b):
(a) a thermal melting curve obtained by primary heating in differential scanning calorimetry shows a melting point within the range of 240 to 280° C. and a melting point peak portion area accounts for at least 60% of heats of fusion area; and
(b) the product of a MFR (g/10 minutes) and a resin pressure (MPa) is not larger than 40, and
wherein the number of —COF groups, —COOH groups, —CH 2 OH groups, —CONH 2 groups, —COOCH 3 groups and —CF 2 H groups in the fluorocopolymer is not larger than 50 per 10 6 main chain carbon atoms.
2. The fluorocopolymer according to claim 1 , wherein the MFR (g/10 minutes) is 10 to 40.
3. The fluorocopolymer according to claim 1 ,
wherein, on the thermal melting curve obtained by primary heating in differential scanning calorimetry, the melting point peak portion area accounts for at least 68% of the heats of fusion area.
4. The fluorocopolymer according to claim 1 ,
which comprises [TFE]-derived copolymerized units, hexafluoropropylene [HFP]-derived copolymerized units and perfluoro(vinyl ether)-derived copolymerized units.
5. The fluorocopolymer according to claim 1 ,
which is obtained by carrying out suspension polymerization.
6. The fluorocopolymer according to claim 1 ,
wherein the perfluoro(vinyl ether) is perfluoro(propyl vinyl ether).
7. The fluorocopolymer according to claim 1 ,
which is resin pellets for extrusion molding.
8. A molded article obtained by molding the fluorocopolymer according to claim 1 .
9. An electric wire covered with a fluorocopolymer according to claim 1 ,
which having a conductor diameter of 0.2 to 1.0 mm.
10. A method of producing electric wire,
which comprises covering a core wire with the fluorocopolymer according to claim 1 , at an electric wire covering speed of 1000 to 3000 feet/minute.