US  10,031,419 B2  172  171  -continued  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.  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.  Ra  Ra  :t :t  Ra  Ra  :t  :t  Ra  :t  Ra  :t  0  o~ot(  Ra  Ra  :t  :t  Ra  Ra  :t  :t 