Patent ID: 7427464

Claim:
A patterning process comprising the steps of: applying an undercoat layer comprising a copolycondensate of a naphthol derivative with dicyclopentadiene on a processable substrate as an antireflective film, said copolycondensate having the general formula (1) or (2): wherein R 1 to R 8 are each independently a hydrogen atom, hydroxyl group, substituted or unsubstituted C 1 -C 6 alkyl group, substituted or unsubstituted C 1 -C 6 alkoxy group, substituted or unsubstituted C 2 -C 6 alkoxycarboxyl, substituted or unsubstituted C 6 -C 10 aryl group, C 1 -C 6 hydroxyalkyl group, isocyanate group or glycidyl ether group, m and n are positive integers, applying a layer of a photoresist composition over the undercoat layer, exposing the photoresist layer in a pattern circuit region to radiation, developing the photoresist layer with a developer to form a resist pattern, and processing the undercoat layer and the substrate through the photoresist layer as a mask, by means of a dry etching apparatus.