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    • 5. 发明公开
    • METHOD FOR MANUFACTURING FLUORINE-CONTAINING POLYMER PARTICLES
    • 制备含氟聚合物颗粒的方法
    • EP3239215A1
    • 2017-11-01
    • EP15872947.5
    • 2015-12-18
    • Asahi Glass Company, Limited
    • SAITO, SusumuHASHIMOTO, WakakoSHIMOHIRA, TetsujiHAMAZAKI, KazuoOTSUGU, SatoshiMATOBA, Hiroki
    • C08J3/16C08F6/12
    • C08F6/12C08F2/06C08F6/003C08J3/16C08L27/12
    • To provide a method capable of producing fluorinated polymer particles in which formation of fine particles or formation of large aggregates is sufficiently suppressed even in the case of a fluorinated polymer having high solubility in a solvent.
      The method comprises the following steps (i) and (ii), being a method for producing particles of a fluorinated polymer (A) which has either one or both of structural units (u1) derived from tetrafluoroethylene and structural units (u2) having no sulfonic acid type functional group and having a cyclic structure and fluorine atoms, and which has structural units (u3) having a sulfonic acid type functional group, wherein the proportion of the structural units (u1) is from 0 to 82 mol% in all structural units (100 mol%) in the fluorinated polymer (A):
      (i) a step of preparing solution or dispersion of the fluorinated polymer (A) having the above fluorinated polymer (A) dissolved or dispersed in a solvent (B), wherein the following conditions (i-1) and (i-2) are satisfied:
      (i-1) the solvent (B) contains a good solvent (B2) wherein the solubility of the fluorinated polymer (A) is at least 30%,
      (i-2) even when the above solution or dispersion of the fluorinated polymer (A) is passed through a filter of 200 mesh made of stainless steel, no residue remains on the filter,

      (ii) a step of mixing the above solution or dispersion of the fluorinated polymer (A) and a solvent (C) to aggregate the fluorinated polymer (A) to form particles of the fluorinated polymer (A), wherein the following conditions (ii-1) to (ii-3) are satisfied:
      (ii-1) the solvent (C) contains a poor solvent (C1) whereby the degree of swelling of the fluorinated polymer (A) is at most 100%,
      (ii-2) the degree of swelling of the fluorinated polymer (A) by a mixed solvent (BC) of the solvent (B) and the solvent (C) is from 70 to 250%,
      (ii-3) the ratio of the mass (Wc) of the solvent (C) to the mass (W B ) of the solvent (B) is from 1 to 5.
    • 本发明提供一种即使在溶剂中溶解性高的含氟聚合物的情况下也能够充分抑制微粒的形成或大的聚集体的形成的含氟聚合物粒子的制造方法。 该方法包括以下步骤(i)和(ii),其是具有衍生自四氟乙烯的结构单元(u1)和不具有来自四氟乙烯的结构单元(u1)中的任一个或两个的结构单元(u2)的含氟聚合物 磺酸型官能团并且具有环状结构和氟原子,并且具有磺酸型官能团的结构单元(u3),其中结构单元(u1)的比例在全部结构中为0至82摩尔% 含氟聚合物(A)中的单元(100摩尔%):(i)将含有上述含氟聚合物(A)的含氟聚合物(A)溶解或分散于溶剂(B)中而得到的含氟聚合物(A) 满足下述条件(i-1)和(i-2):(i-1)溶剂(B)含有氟系聚合物(A)的溶解度为30%以上的良溶剂 (i-2)即使上述含氟聚合物(A)的溶液或分散体通过a (ii)将上述含氟聚合物(A)的溶液或分散液与溶剂(C)混合,使含氟聚合物(A)与聚合物 (ii)含有下述条件(ii-1)〜(ii-3)的氟化聚合物(A)的粒子,(ii-1)溶剂(C)含有不良溶剂 (B)与溶剂(C)的混合溶剂(BC)的含氟聚合物(A)的溶胀度为100%以下,(ii-2)含氟聚合物 (ii-3)溶剂(C)的质量(Wc)与溶剂(B)的质量(WB)的比例为1〜5。