Patent ID: 7105254

Claim:
A polymer electrolyte comprising: a polymer gel holding a nonaqueous solvent containing an electrolyte, wherein said polymer gel comprises a polymer containing (I) monomeric units derived from at least one compound having one copolymerizable vinyl group and (II) monomeric units derived from a compound (II-a) represented by formula (2): H 2 C═C(R)COO[(CH 2 CH 2 O) p —(CH 2 CH(R 1 )O q —(CH 2 CH 2 O) p ]COC(R)═CH 2 (2) wherein R represents an alkyl group having 1 to 4 carbon atoms; R 1 represents a hydrogen atom or a methyl group; p represents an integer of 16 or smaller; and q represents an integer of 34 or smaller, wherein said monomeric units (I) are derived from at least one compound selected from the group consisting of (meth)acrylonitrile, an (α-alkyl) acrylic acid, an alkyl(α-alkyl)acrylate, a fluoroalkyl(α-alkyl)acrylate, a fluoroalkyl(α-fluoroalkyl)acrylate, a vinyl ester, a vinylalkyl ether, an allylalkyl ether, an allyl ester, vinyl alcohol, vinyl chloride, vinylidene chloride, and a cyclic olefin.