| 摘要 |
The invention relates to an insulating film for an electromagnetic coil which is composed of a liquid crystal polyester, in which the liquid crystal polyester has a structural unit represented by the following formula (1), a structural unit represented by the following formula (2), and a structural unit represented by the following formula (3), and the amount of the structural units including a 2,6-naphthalenediyl group is 40 mol % or more with respect to the total amount of all the structural units. —O—Ar1—CO—,   (1) —CO—Ar2—CO—, and   (2) —O—Ar3—O—  (3) (In the formulae, Ar1 represents a 2,6-naphthalenediyl group, a 1,4-phenylene group, or a 4,4′-biphenylylene group; Ar2 and Ar3 respectively represent a 2,6-naphthalenediyl group, a 1,4-phenylene group, a 1,3-phenylene group, or a 4,4′-biphenylylene group; and hydrogen atoms in the groups represented by Ar1, Ar2, and Ar3 may be substituted respectively with a halogen atom, an alkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 20 carbon atoms.) |
