| 摘要 |
PROBLEM TO BE SOLVED: To obtain an agricultural covering material excellent in flexibility, light transmittance, durability, dust-proofness, or the like, by selecting a film comprising a fluorocopolymer containing polymer units derived from tetrafluoroethylene, polymer units derived from propylene, and polymer units derived from vinylidene fluoride in a specified ratio. SOLUTION: This material is a film comprising a fluorocopolymer containing 5-85 mol.% polymer units derived from tetrafluoroethylene, 11-50 mol.% polymer units derived from propylene, and 5-70 mol.% polymer units derived from vinylidene fluoride and desirably having a molecular weight of about 1-300 mm<3> /sec in terms of a volume flow rate and a dynamic viscoelasticity modulus of 1-70 kg/mm<2> and desirably having a thickness of 10-300μm. It is also possible, if necessary, that the fluorocopolymer contains, desirably, at most 50 mol.% polymer units derived from at least one comonomer such as a fluoroolefin or a hydrocarbon-type olefin. |
