| abstract |
The polymer includes a structural unit represented by the following formula (1a), a structural unit represented by the following formula (1b), and a structural unit represented by the following formula (1c). (In the formula (1a), n is 0, 1 or 2. R 1 , R 2 , R 3 and R 4 are each independently hydrogen or an organic group having 1 to 10 carbon atoms. Formula (1c) R 5 is an organic group having 1 to 10 carbon atoms) |