(JP9324114-A)      A polymer solid electrolyte comprises a polyether copolymer having an oligo-oxyethylene side chain and an electrolyte salt cpd. that is sol. in the polyether copolymer, which is a solid random copolymer contg. in the main chain 5-30 mol.% of units of formula -(CH2CH(CH2O(CH2CH2O)nMe)O)- (I) and 95-70 mol.% of units of formula -(CH2CH-2O)- (II): The polyether polymer has a degree of polymerisation (n) of oxyethylene units in (I) of 1-12, a number average mol.wt. (Mn) of 100,000-2,000,000, a max. glass transition temp. (Tg), measured by DSC, of -60 C and a max. heat of fusion of 70 J/g.    Also claimed is a battery contg. the above polymer solid electrolyte.    USE -   in electrochemical devices, e.g. batteries, (large capacity) capacitors, sensors, display devices e.g. electrochromic displays, etc.    ADVANTAGE -   the polymer has an ion conductivity superior to that of prior art solid electrolytes, superior processing and moulding characteristics and superior mechanical strength and flexibility.    (US5837157-A)      A polymer solid electrolyte comprises a polyether copolymer having an oligo-oxyethylene side chain and an electrolyte salt cpd. that is sol. in the polyether copolymer, which is a solid random copolymer contg. in the main chain 5-30 mol.% of units of formula (I) and 95-70 mol.% of units of formula (II): The polyether polymer has a degree of polymerisation (n) of oxyethylene units in (I) of 1-12, a number average mol.wt. (Mn) of 100,000-2,000,000, a max. glass transition temp. (Tg), measured by DSC, of -60 C and a max. heat of fusion of 70 J/g.    Also claimed is a battery contg. the above polymer solid electrolyte.    USE -   in electrochemical devices, e.g. batteries, (large capacity) capacitors, sensors, display devices e.g. electrochromic displays, etc.    ADVANTAGE -   the polymer has an ion conductivity superior to that of prior art solid electrolytes, superior processing and moulding characteristics and superior mechanical strength and flexibility.    (JP3022317-B2)      A polymer solid electrolyte comprises a polyether copolymer having an oligo-oxyethylene side chain and an electrolyte salt cpd. that is sol. in the polyether copolymer, which is a solid random copolymer contg. in the main chain 5-30 mol.% of units of formula (I) and 95-70 mol.% of units of formula (II): The polyether polymer has a degree of polymerisation (n) of oxyethylene units in (I) of 1-12, a number average mol.wt. (Mn) of 100,000-2,000,000, a max. glass transition temp. (Tg), measured by DSC, of -60 C and a max. heat of fusion of 70 J/g.    Also claimed is a battery contg. the above polymer solid electrolyte.    USE -   in electrochemical devices, e.g. batteries, (large capacity) capacitors, sensors, display devices e.g. electrochromic displays, etc.    ADVANTAGE -   the polymer has an ion conductivity superior to that of prior art solid electrolytes, superior processing and moulding characteristics and superior mechanical strength and flexibility.    (EP742563-B1)      A polymer solid electrolyte comprises a polyether copolymer having an oligo-oxyethylene side chain and an electrolyte salt cpd. that is sol. in the polyether copolymer, which is a solid random copolymer contg. in the main chain 5-30 mol.% of units of formula (I) and 95-70 mol.% of units of formula (II): The polyether polymer has a degree of polymerisation (n) of oxyethylene units in (I) of 1-12, a number average mol.wt. (Mn) of 100,000-2,000,000, a max. glass transition temp. (Tg), measured by DSC, of -60 C and a max. heat of fusion of 70 J/g.    Also claimed is a battery contg. the above polymer solid electrolyte.    USE -   in electrochemical devices, e.g. batteries, (large capacity) capacitors, sensors, display devices e.g. electrochromic displays, etc.    ADVANTAGE -   the polymer has an ion conductivity superior to that of prior art solid electrolytes, superior processing and moulding characteristics and superior mechanical strength and flexibility.    (TW384296-A)      A polymer solid electrolyte comprises a polyether copolymer having an oligo-oxyethylene side chain and an electrolyte salt cpd. that is sol. in the polyether copolymer, which is a solid random copolymer contg. in the main chain 5-30 mol.% of units of formula (I) and 95-70 mol.% of units of formula (II): The polyether polymer has a degree of polymerisation (n) of oxyethylene units in (I) of 1-12, a number average mol.wt. (Mn) of 100,000-2,000,000, a max. glass transition temp. (Tg), measured by DSC, of -60 C and a max. heat of fusion of 70 J/g.    Also claimed is a battery contg. the above polymer solid electrolyte.    USE -   in electrochemical devices, e.g. batteries, (large capacity) capacitors, sensors, display devices e.g. electrochromic displays, etc.    ADVANTAGE -   the polymer has an ion conductivity superior to that of prior art solid electrolytes, superior processing and moulding characteristics and superior mechanical strength and flexibility.