(JP10130487-A)      A polyether copolymer of weight average molecular weight 103-107 comprises: (a) 5-95 mole% of repeat units from a monomer of formula (I); (b) 95-5 mole% of units from a monomer of formula (II); and (c) 0-15 mole% of units from a monomer of formula (III) or (IV): R1 = 1-12C alkyl, 2-8C alkenyl, 3-8C cycloalkyl, 6-14C aryl, 7-12C aralkyl or tetrahydropyranyl; and n = an integer, 1-12; R2, R3 = a group having an ethylenically unsaturated group, a reactive silicon group, a reactive halogen group or a group having a terminal epoxy group and having the formula (V): A = a divalent organic group comprising atoms selected from carbon, oxygen and hydrogen. Also claimed are: (1) a crosslinked material prepared by using the reactivity of a crosslinking component of the above polyether copolymer; (2) a polymer solid electrolyte comprising the above polyether copolymer, or the above crosslinked material, and an electrolyte salt that is soluble in the polyether copolymer; and (3) a batter y comprising the above polymer solid electrolyte.    USE -   The copolymer is used to form solid polymer electrolytes for electrochemical devices, e.g. batteries (claimed) which are lightweight and large-capacity, capacitors, sensors, etc., and as an antistatic agent or electricity-controlling agent for rubber, plastics, etc.    ADVANTAGE -   The solid electrolyte has high ionic conductivity at room temperature.    (JP10176105-A)      A polyether copolymer of weight average molecular weight 103-107 comprises: (a) 5-95 mole% of repeat units from a monomer of formula (I); (b) 95-5 mole% of units from a monomer of formula (II); and (c) 0-15 mole% of units from a monomer of formula (III) or (IV): R1 = 1-12C alkyl, 2-8C alkenyl, 3-8C cycloalkyl, 6-14C aryl, 7-12C aralkyl or tetrahydropyranyl; and n = an integer, 1-12; R2, R3 = a group having an ethylenically unsaturated group, a reactive silicon group, a reactive halogen group or a group having a terminal epoxy group and having the formula (V): A = a divalent organic group comprising atoms selected from carbon, oxygen and hydrogen. Also claimed are: (1) a crosslinked material prepared by using the reactivity of a crosslinking component of the above polyether copolymer; (2) a polymer solid electrolyte comprising the above polyether copolymer, or the above crosslinked material, and an electrolyte salt that is soluble in the polyether copolymer; and (3) a batter y comprising the above polymer solid electrolyte.    USE -   The copolymer is used to form solid polymer electrolytes for electrochemical devices, e.g. batteries (claimed) which are lightweight and large-capacity, capacitors, sensors, etc., and as an antistatic agent or electricity-controlling agent for rubber, plastics, etc.    ADVANTAGE -   The solid electrolyte has high ionic conductivity at room temperature.    (JP10204172-A)      A polyether copolymer of weight average molecular weight 103-107 comprises: (a) 5-95 mole% of repeat units from a monomer of formula (I); (b) 95-5 mole% of units from a monomer of formula (II); and (c) 0-15 mole% of units from a monomer of formula (III) or (IV): R1 = 1-12C alkyl, 2-8C alkenyl, 3-8C cycloalkyl, 6-14C aryl, 7-12C aralkyl or tetrahydropyranyl; and n = an integer, 1-12; R2, R3 = a group having an ethylenically unsaturated group, a reactive silicon group, a reactive halogen group or a group having a terminal epoxy group and having the formula (V): A = a divalent organic group comprising atoms selected from carbon, oxygen and hydrogen. Also claimed are: (1) a crosslinked material prepared by using the reactivity of a crosslinking component of the above polyether copolymer; (2) a polymer solid electrolyte comprising the above polyether copolymer, or the above crosslinked material, and an electrolyte salt that is soluble in the polyether copolymer; and (3) a batter y comprising the above polymer solid electrolyte.    USE -   The copolymer is used to form solid polymer electrolytes for electrochemical devices, e.g. batteries (claimed) which are lightweight and large-capacity, capacitors, sensors, etc., and as an antistatic agent or electricity-controlling agent for rubber, plastics, etc.    ADVANTAGE -   The solid electrolyte has high ionic conductivity at room temperature.    (US5968681-A)      A polyether copolymer of weight average molecular weight 103-107 comprises: (a) 5-95 mole% of repeat units from a monomer of formula (I); (b) 95-5 mole% of units from a monomer of formula (II); and (c) 0-15 mole% of units from a monomer of formula (III) or (IV): R1 = 1-12C alkyl, 2-8C alkenyl, 3-8C cycloalkyl, 6-14C aryl, 7-12C aralkyl or tetrahydropyranyl; and n = an integer, 1-12; R2, R3 = a group having an ethylenically unsaturated group, a reactive silicon group, a reactive halogen group or a group having a terminal epoxy group and having the formula (V): A = a divalent organic group comprising atoms selected from carbon, oxygen and hydrogen. Also claimed are: (1) a crosslinked material prepared by using the reactivity of a crosslinking component of the above polyether copolymer; (2) a polymer solid electrolyte comprising the above polyether copolymer, or the above crosslinked material, and an electrolyte salt that is soluble in the polyether copolymer; and (3) a batter y comprising the above polymer solid electrolyte.    USE -   The copolymer is used to form solid polymer electrolytes for electrochemical devices, e.g. batteries (claimed) which are lightweight and large-capacity, capacitors, sensors, etc., and as an antistatic agent or electricity-controlling agent for rubber, plastics, etc.    ADVANTAGE -   The solid electrolyte has high ionic conductivity at room temperature.