A carboxylic acid tertiary alkyl ester (Chemical formula 1) of high purity is obtained at a high yield ratio, by continually adding an esterification agent possessing a monovalent acid group, which agent is ester-interchangeable with a tertiary alcohol, to a mixed fluid of a carboxylic acid and a tertiary alcohol: R.sub.1 (COOR.sub.2).sub.n. (1)

 
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> Polymers obtained from monomers allowing a sequential polymerization, and their use for preparing ionic conductors

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