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    • 6. 发明授权
    • Vinylidene fluoride polymer and method of making same
    • 偏二氟乙烯聚合物及其制备方法
    • US5283302A
    • 1994-02-01
    • US923487
    • 1992-08-03
    • Hideki WakamoriFujio SuzukiKatsuo Horie
    • Hideki WakamoriFujio SuzukiKatsuo Horie
    • C08F214/22C08F14/18
    • C08F214/22
    • Polyvinylidene fluoride (PVDF) having such crystallization properties as to produce small spheralite sizes without sacrificing properties, processability, purity, etc. comprises 99.5-96 wt. % of vinylidene fluoride and 0.5-4 wt. % of a comonomer selected from the group consisting of hexafluoropropylene, tetrafluoroethylene and mixtures thereof, has a logarithmic viscosity of 0.9-1.3 dl/g and a molecular weight distribution, as expressed by the ratio of weight average molecular weight to number average molecular weight, of 2.2-2.8. The PVDF is formed by suspension polymerizing vinylidene fluoride and 1-5 wt. % of the desired comonomer, in an aqueous medium in the presence of an oil-soluble initiator, so that a logarithmic viscosity [.eta..sub.1 ] of 1.3-1.9 dl/g is obtained at a vinylidene fluoride conversion of 10-50%; then adding a chain transfer agent to the medium and continuing polymerization so that the logarithmic viscosity [.eta..sub.2 ] of the final polymer is 0.3-0.7 dl/g lower than [.eta..sub.1 ] but remains in the range of 0.9-1.3 dl/g.
    • 具有这样的结晶特性的聚偏二氟乙烯(PVDF)能够在不牺牲性能,加工性,纯度等的情况下产生小的球晶尺寸,包括99.5-96wt。 %偏二氟乙烯和0.5-4wt。 选自六氟丙烯,四氟乙烯及其混合物的共聚单体的%具有0.9-1.3dl / g的对数粘度和由重均分子量与数均分子量的比率表示的分子量分布, 为2.2-2.8。 PVDF通过悬浮聚合偏二氟乙烯和1-5重量% %的所需共聚单体,在油溶性引发剂存在下的水性介质中,使得在偏二氟乙烯转化率为10-50%时获得的对数粘度((η)1)为1.3-1.9dl / g) ; 然后向介质中加入链转移剂并继续聚合,使得最终聚合物的对数粘度((η)2)低于((η))为0.3-0.7dl / g,但仍保持在0.9- 1.3 dl / g。