(JP5198303-A)      A galvanic cell uses a solid electrolyte prepd. by crosslinking a soln. of trifunctional alkylene oxide polymer modified its terminal with alkyolyl gp. and each contg. polyfunctional polymer chain of formula (I), a solvent in an amt of 220-950 wt.% of the modified trifunctinal alkylene oxide polymer and an electrolyte by irradiating the soln. with active radiation and/or heating the soln. In (I), R' = a lower alkyl, R" = H or methyl, m and n = O or an integer and (m + n) = at least 35.    The modified alkylene oxide polymer is prepd. by esterifying or ester changing trifunctional alkylene oxide polymer prepd. by ring-opening polymerising an alkylene oxide (e.g, ethylene oxide, propylene oxide, butylene oxide, 1,2-epoxyhexane or 1,2-epoxyoctane) in the presence of glycerol or trimethylolpropane with unsatd. carboxylic acid (e.g, (meth)acrylic acid) or with an acid chloride (e.g, (meth)acryloyl chloride). The solvent is e.g. ethylene carbonate, propylene carbonate, gamma-butyrolactone, dimethoxyethane, DMSO, dioxolane or sulpholane.    USE/ADVANTAGE -   The solid electrolyte causes no leakage of the liq. components and provides a high electric capacity. The galvanic cell is used as a back-up source for an electronic device or a power source for a watch, camera or pacemaker.    (JP7006787-A)      A cell uses a solid electrolyte prepd. by dissolving a trifunctional acyloyl-terminated alkylene oxide polymer having a polymer chain of formula -(CH2CH2O)m-(CH2CHR'O)n-CO.C(R")=CH2 (I) and an electrolyte salt in 220-950 wt.% based on the polymer, of a solvent, and cross-linking the polymer by applying an active radiation and/or heat. In (I) R` is C1-C6 alkyl; R" is H or methyl; and m and n is each a number of 0, 1 or above, provided that m + n is at least 35. A typical cell is one composed of a composite positive electrode comprising a solid electrolyte integrated with a positive electrode active material, prepared by mixing the above polymer with an electrolyte salt, a solvent and a positive electrode active material and cross-linking the polymer by applying an active radiation and/or heat to the formed mixt. and, provided between the positive electrode and a negative electrode, a separator comprising a solid electrolyte layer prepared by mixing the above polymer with an electrolyte salt and a solvent and cross-linking the polymer by applying an active radiation and/or heat to the formed mixture.    (US5436090-A)      Galvanic cell is produced by using a solid electrolyte prepd. by (a) dissolving a trifunctional polymer in a solvent with an electrolyte salt to form a soln., and (b) crosslinking the soln. by radioactive ray irradiation and/or by heating. The trifunctional polymer is a trifunctional terminal acryloyl-modified alkylene oxide polymer having a molecular wt. of at least 5000 and comprising a polymer chain of formula -(CH2CH2O)m-(CH2CHR10)n-CO-C(R11)=CH2 (I). The amt. of solvent is 220-950 wt.% based on the modified alkylene oxide polymer. In (I), R1 is 1-6C alkyl; R11 is H or methyl; m and n are each O or at least 1, and m+n is at least 35.    The solvent is pref. at least 1 of ethylene carbonate, propylene carbonate, gamma-butyrolactone, dimethoxyethane, DMSO, dioxolane, sulpholane and water. The electrolyte salt is e.g. LiF or LiCl.    ADVANTAGE -   Cell has good long term reliability and safety, high performance and energy density and no liq. leakage.