Patent ID: 7749681

Claim:
A composition for forming a lower layer film comprising a polymer(A), having a weight average molecular weight (Mw) of 500 to 8,000, and having a naphthalene derivative structural unit shown by the following formula (1), wherein R1 represents a hydroxyl group, a substitutable alkyl group having 1 to 6 carbon atoms, a substitutable alkoxy group having 1 to 6 carbon atoms, a substitutable alkoxycarbonyl group having 2 to 10 carbon atoms, a substitutable aryl group having 6 to 14 carbon atoms, or a substitutable glycidyl ether group having 2 to 6 carbon atoms, n represents an integer from 0 to 6, X represents a methylene group, a substitutable alkylene group having 2 to 20 carbon atoms, a substitutable arylene group having 6 to 14 carbon atoms, or an alkylene ether group, and m represents an integer from 1 to 8, provided that two or more R1s may be the same or different when n is 2 to 6, two or more Xs may be the same or different when m is 2 to 8, and n +m is an integer from 1 to 8.