| 主权项 |
1. A polymer that has a main chain comprising repeating units represented by formula (1) and repeating units represented by formula (2) and satisfies requirements (a1), (a2), and (a3), wherein R1 represents hydrogen, a methyl group, or an ethyl group, and R2 represents an acetoxy group, a methoxycarbonyl group, an ethoxycarbonyl group, or a tert-butoxycarbonyl group; (a1): the ratio of the number of the repeating units represented by formula (2) to the total number of the carbon atoms that constitute the main chain of the polymer is from 3.8% to 7.5%; (a2): the ratio X represented by formula (3) is from 82% to 100%;
X=100×A/B (3) where
A represents the total number of the carbon atoms of the carbonyl groups of the R2s of all the repeating units that satisfy the following requirement (a2-1) and are represented by formula (2), (a2-1): no functional group represented by the following formula (A), (B), (C), (D), (E) or (F) is bonded to any of the carbon atoms C1, C2, and C3, where C1 is a carbon atom that bonds to a repeating unit represented by formula (2), C2 is a carbon atom that bonds to C1, and C3 that bonds to C2, wherein R3, R4, R5, R6, R7, and R8 each independently represent an alkyl group or hydrogen; and
B is the total number of the carbon atoms of the carbonyl groups of the R2s of all the repeating units represented by formula (2); and (a3): the polymer has a melting point of 42° C. to 90° C. as measured with a differential scanning calorimeter. |
