| abstract |
Provided is a composition for forming releasing layers, which contains: a polyamic acid that contains a structural unit represented by formula (1) and has a weight average molecular weight of 5,000 or more; and an organic solvent. [(In the formula, X 1 represents a phenyl group or a biphenyl group; Z 1 represents a group represented by formula [Z1]; and n 1 represents a natural number.) (In formula [Z1], Y 1 represents a single bond or a linking group; Y 2 represents a single bond, an alkylene group having 1-15 carbon atoms, or the like; Y 3 represents a single bond, an alkylene group having 1-15 carbon atoms, or the like; Y 4 represents a single bond, a cyclic group, a divalent organic group having a steroid skeleton, or the like; Y 5 represents a divalent cyclic group such as a benzene ring, or the like; n represents an integer of 0-4, and in cases where n is 2 or more, the Y 5 moieties may be the same as or different from each other; Y 6 represents a hydrogen atom, an alkyl group having 1-18 carbon atoms, or the like; and the linking group represents -O- or the like.)] |