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polymerization, condensation polymerization, and addition condensation, but is preferably a repeating unit which is obtained by addition polymerization of a carbon-carbon double bond. Examples thereof include an acrylate-based repeating unit (a type which has a substituent group at an 5 a-position or a ~-position is also included), a styrene-based repeating unit (a type which has a substituent group at an a-position or a ~-position is also included), a vinylether- based repeating unit, a norbornene-based repeating unit, a repeating unit of a maleic acid derivative (maleic anhydride or derivatives thereof, maleimide, and the like), and the like, an acrylate-based repeating unit, a styrene-based repeating unit, a vinylether-based repeating unit, and a norbornene› based repeating unit are preferable, an acrylate-based repeat› ing unit, a vinylether-based repeating unit, and a nor› bornene-based repeating unit are more preferable, and an acrylate-based repeating unit is most preferable. 10 15 

Specific examples of the repeating unit(~) will be shown below; however, the present invention is not limited thereto. Ra represents a hydrogen atom, a fluorine atom, a methyl group, or a trifluoromethyl group. 

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-continued 

