Patent ID: 7510820

Claim:
A photoresist undercoat-forming material for forming an undercoat among lithographic multilayer resist coatings, comprising a copolymer which comprises recurring units having the general formula (1): wherein R 1 and R 6 each are hydrogen or methyl, R 2 , R 3 and R 4 each are a hydrogen atom, C 1 -C 4 alkyl group, alkoxy group, hydroxy group, acetoxy group or alkoxycarbonyl group, or C 6 -C 10 aryl group, R 5 is â€”Oâ€”R 7 , â€”C(â•O)â€”Oâ€”R 7 , â€”Oâ€”C (â•O)â€”R 7 , or â€”C(â•O)â€”NR 8 â€”R 7 , wherein R 7 is an organic group, and R 8 is a hydrogen atom or C 1 -C 6 hydrocarbon group, m is 1 or 2, n is an integer of 0 to 4, p is an integer of 0 to 6, a, b, c, and e are numbers in the range: 0<a<1.0, 0â‰¦bâ‰¦0.8 0â‰¦câ‰¦0.8, 0â‰¦eâ‰¦0.8, and 0â‰¦b+c+e<1.0, and said organic group of R 7 has the formula selected from the group consisting of the to following formulae: wherein each dotted line in the formulae represents a valence bond.