Patent ID: 11919985

Abstract:
Provided is a copolymer that can be favorably used as a main chain scission-type positive resist that has excellent heat resistance and that can form a resist pattern having excellent resolution and clarity. The copolymer includes a monomer unit (A) represented by the following formula (I) and a monomer unit (B) represented by the following formula (II), and has a molecular weight distribution of 1.7 or less. In the formulae, L is a single bond or a divalent linking group, Ar is an optionally substituted aromatic ring group, R1 is an alkyl group, R2 is an alkyl group, a halogen atom, or a haloalkyl group, p is an integer of not less than 0 and not more than 5, and in a case in which more than one R2 is present, each R2 may be the same or different.