Patent ID: 8313890

Claim:
An antireflective coating composition comprising (A) at least one polymer comprising recurring units represented by the general formula (1) and recurring units selected from the general formulae (2) to (4) and having an extinction coefficient k in the range of 0.01 to 0.4 and a refractive index n in the range of 1.4 to 2.1 at a preselected imaging radiation wavelength, and (B) at least one aromatic ring containing-polymer comprising recurring units selected from the following formulae (i) to (xxvi) and having an extinction coefficient k in the range of 0.3 to 1.2 at a preselected imaging radiation wavelength so that the extinction coefficient k of polymer (A) is set lower than that of polymer (B), wherein R 1 is hydrogen, fluorine, methyl, or trifluoromethyl, and R 2 to R 6 are each independently hydrogen, fluorine, trifluoromethyl, or a C 1 -C 5 alkoxy group in which at least one hydrogen atom is substituted by fluorine, with the proviso that not all R 2 to R 6 are hydrogen at the same time, wherein R 7 , R 9 and R 13 are each independently hydrogen, fluorine, methyl, or trifluoromethyl, R 8 is hydrogen or a straight, branched or cyclic, monovalent hydrocarbon group of 1 to 30 carbon atoms in which some hydrogen atoms may be substituted by halogen and a constituent unit —CH 2 — may be substituted by —O— or —C(═O)—, n is 1 or 2, L 1 is a straight, branched or cyclic, di- or trivalent hydrocarbon group of 1 to 15 carbon atoms, R 10 to R 12 are each independently hydrogen, hydroxyl, halogen, or a straight, branched or cyclic, monovalent organic group of 1 to 15 carbon atoms, at least two of R 10 to R 12 may bond together to form a ring with the carbon atom(s) to which they are attached, and R 14 is a hydrocarbon group of 2 to 15 carbon atoms in which at least one hydrogen atom is substituted by fluorine,