The hyperbranched polymer having ethylene oxide chain and use thereof

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PROBLEM TO BE SOLVED : To provide a hyperbranched polymer suitable as a matrix polymer of a solid electrolyte using a lithium salt.SOLUTION : The hyperbranched polymer is shown by formula (1). In the formula (1), Ris a hydrogen atom or a methyl group; Rand Rare each a 1-20C alkyl group, a 1-20C haloalkyl group or the like independently; Ais a bivalent group shown by formula (2); l is an integer of 2-100, 000; n and m are each an integer of 1-40 independently. In the formula (2), Ais a 1-20C alkylene group; Y-Yare each a hydrogen atom, a halogen atom or the like independently.