(EP885913-A1)      An optionally crosslinked copolyether with weight-average molecular weight of 103-107 comprises:    (A) 0.5-99 mol.% repeating units derived from a monomer of formula (I), where R1, R2 = independently 1-12C alkyl, 2-8C alkenyl, 3-8C cycloalkyl, 6-14C aryl, 7-12C aralkyl, or tetrahydropyranyl, and m, n = 1-12;    (B) 99.5-1 mol.% repeating units derived from a monomer of formula (II); and    (C) 0-15 mol.% repeating units derived from a monomer with 1 epoxy and 1 or more reactive functional groups.    Also claimed is a solid polymer electrolyte prepared by blending (1) the copolyether, (2) an electrolytic salt, and (3), if necessary, a plasticiser selected from aprotic organic solvents, and metal salts, derivatives and their metals salts of linear or branched polyalkylene glycols with number-average molecular weight 200-5000.    USE -   The copolyether can be used to produce solid electrolyte and batteries (claimed), as well as other electrochemical devices such as capacitors, separators and large-volume capacitors, display elements in electrochromic displays, and charge inhibitors in rubber and plastics.    ADVANTAGE -   Solid polymer electrolyte thus fabricated has processability, mouldability, mechanical strength, softness, heat resistance, and improved ion conductivity.    (JP10526483-X)      An optionally crosslinked copolyether with weight-average molecular weight of 103-107 comprises:    (A) 0.5-99 mol.% repeating units derived from a monomer of formula (I), where R1, R2 = independently 1-12C alkyl, 2-8C alkenyl, 3-8C cycloalkyl, 6-14C aryl, 7-12C aralkyl, or tetrahydropyranyl, and m, n = 1-12;    (B) 99.5-1 mol.% repeating units derived from a monomer of formula (II); and    (C) 0-15 mol.% repeating units derived from a monomer with 1 epoxy and 1 or more reactive functional groups.    Also claimed is a solid polymer electrolyte prepared by blending (1) the copolyether, (2) an electrolytic salt, and (3), if necessary, a plasticiser selected from aprotic organic solvents, and metal salts, derivatives and their metals salts of linear or branched polyalkylene glycols with number-average molecular weight 200-5000.    USE -   The copolyether can be used to produce solid electrolyte and batteries (claimed), as well as other electrochemical devices such as capacitors, separators and large-volume capacitors, display elements in electrochromic displays, and charge inhibitors in rubber and plastics.    ADVANTAGE -   Solid polymer electrolyte thus fabricated has processability, mouldability, mechanical strength, softness, heat resistance, and improved ion conductivity.    (CN1210548-A)      An optionally crosslinked copolyether with weight-average molecular weight of 103-107 comprises:    (A) 0.5-99 mol.% repeating units derived from a monomer of formula (I), where R1, R2 = independently 1-12C alkyl, 2-8C alkenyl, 3-8C cycloalkyl, 6-14C aryl, 7-12C aralkyl, or tetrahydropyranyl, and m, n = 1-12;    (B) 99.5-1 mol.% repeating units derived from a monomer of formula (II); and    (C) 0-15 mol.% repeating units derived from a monomer with 1 epoxy and 1 or more reactive functional groups.    Also claimed is a solid polymer electrolyte prepared by blending (1) the copolyether, (2) an electrolytic salt, and (3), if necessary, a plasticiser selected from aprotic organic solvents, and metal salts, derivatives and their metals salts of linear or branched polyalkylene glycols with number-average molecular weight 200-5000.    USE -   The copolyether can be used to produce solid electrolyte and batteries (claimed), as well as other electrochemical devices such as capacitors, separators and large-volume capacitors, display elements in electrochromic displays, and charge inhibitors in rubber and plastics.    ADVANTAGE -   Solid polymer electrolyte thus fabricated has processability, mouldability, mechanical strength, softness, heat resistance, and improved ion conductivity.    (US6180287-B1)      An optionally crosslinked copolyether with weight-average molecular weight of 103-107 comprises:    (A) 0.5-99 mol.% repeating units derived from a monomer of formula (I), where R1, R2 = independently 1-12C alkyl, 2-8C alkenyl, 3-8C cycloalkyl, 6-14C aryl, 7-12C aralkyl, or tetrahydropyranyl, and m, n = 1-12;    (B) 99.5-1 mol.% repeating units derived from a monomer of formula (II); and    (C) 0-15 mol.% repeating units derived from a monomer with 1 epoxy and 1 or more reactive functional groups.    Also claimed is a solid polymer electrolyte prepared by blending (1) the copolyether, (2) an electrolytic salt, and (3), if necessary, a plasticiser selected from aprotic organic solvents, and metal salts, derivatives and their metals salts of linear or branched polyalkylene glycols with number-average molecular weight 200-5000.    USE -   The copolyether can be used to produce solid electrolyte and batteries (claimed), as well as other electrochemical devices such as capacitors, separators and large-volume capacitors, display elements in electrochromic displays, and charge inhibitors in rubber and plastics.    ADVANTAGE -   Solid polymer electrolyte thus fabricated has processability, mouldability, mechanical strength, softness, heat resistance, and improved ion conductivity.