PROCESS FOR PRODUCING POLYETHER POLYMER COMPOSITION, POLYETHER POLYMER COMPOSITION, AND SOLID ELECTROLYTE FILM

摘要

A process for producing a polyether polymer composition, which comprises preparing a slurry comprising an organic solvent and a polyether polymer dispersed therein, adding to the slurry an antioxidant which is insoluble in the organic solvent and/or a stabilizer which is soluble in the solvent to disperse or dissolve the antioxidant and/or stabilizer, and then removing the organic solvent. Also provided is a polyether polymer composition which comprises polyether polymer particles and an antioxidant insoluble in an organic solvent in which the polymer particles are insoluble and/or a stabilizer soluble in the organic solvent, the composition satisfying at least one of the following (1), (2), and (3): (1) most of the antioxidant is adherent to the surface of the polymer particles, (2) the polyether polymer has a gel content of 5 wt.% or lower, and (3) most of the stabilizer is present in the polymer particles. The polyether polymer composition obtained by the production process and the polyether polymer composition satisfying at least one of the requirements (1), (2), and (3) give a solid electrolyte film having excellent mechanical properties.