| 摘要 |
PROBLEM TO BE SOLVED: To obtain a fluoropolymer compsn. which has crystallization properties with small spherulite size by compounding a fluorocopolymer with a tetrafluoroethylene-perfluoro(alkyl vinyl ether) copolymer in a specified ratio. SOLUTION: This compsn. comprises 0.05-20 wt.% fluorocopolymer consisting of 96-99.9 mol.% units of formula I, 0.1-1 mol.% units of formula II, and 0-3 mol.% units of formula III and 99.5-80 wt.% tetrafluoroethylene-perfluoro (alkyl vinyl ether) copolymer and gives a molded article having a spherulite size of 10μm or lower and an extrusion molded tube having an internal surface roughness of 0.3μm or lower. The melt viscosity of the fluorocopolymer is pref. 5,000-500,000 P at 372 deg.C in teams of moldabilty. In the formulas, X is F or Cl; R<f> is a divalent fluorinated org. group; Y is hydroxyalkyl, carboxyl or the like; and Z is a monovalent fluorinated org. group. |
