Patent ID: 7189651

Claim:
A chemical mechanical planarization stopper film present on the surface of a substrate, consisting of at least one polycarbosilane polymer consisting of structural units of the following formula (1), wherein R 1 and R 2 independently represent a hydrogen atom, an alkyl group having 1–30 carbon atoms that may have a substituent, an alkenyl group having 1–30 carbon atoms that may have a substituent, an alkynyl group having 1–30 carbon atoms that may have a substituent, or an aromatic group that may have a substituent and R 3 represents —C≡C—, —CH 2 — that may have a substituent linked with at least one —C≡C— group, an alkylene group having 2–30 carbon atoms that may have a substituent linked with at least one —C≡C— group, an alkenylene group having 2–30 carbon atoms that may have a substituent linked with at least one —C≡C— group, an alkynylene group having 2–30 carbon atoms that may have a substituent linked with at least one —C≡C— group, or a divalent aromatic group having 2–30 carbon atoms that may have a substituent linked with at least one —C≡C— group.