| abstract |
Wherein R 1 , R 2 and R 3 each independently represent a hydrogen atom or the like, and R 4 represents a hydrogen atom or an alkyl group having 6 to 40 carbon atoms, An aryl group, and n represents an integer of 0 to 12, , And the total amount of the repeating units represented by the above formulas (1) and (2) is 90 mol% or more based on the total repeating units. |