Patent ID: 6946233

Claim:
A polymer having a weight-average molecular weight of 1,000 to 500,000, comprising A) repeating unit represented by formula (2) below, a repeating unit represented by formula (3) below, or two or more repeating units selected from the group consisting of repeating units represented by formulae (1), (2), and (3) below; and B) one or more repeating units represented by formula (4) below: wherein, R 1 , R 3 , R 5 and R 7 each represents a hydrogen atom or a methyl group, R 2 , R 4 and R 6 each represents a linear, branched or cyclic C 1-8 alkyl group, and R 8 and R 9 each represents a hydrogen atom or a hydroxyl group, with a proviso that R 2 , R 4 and R 6 are bonded in endo-sites of a bicyclo[2.2.1]heptane ring, a tricyclo[5.2.1.0 2,6 ]decane ring and a tetracyclo[4.4.0.1 2,5 .1 7,10 ]dodecane ring, respectively.