Sulfonate and its derivative, photosensitive acid generator, and resist composition and patterning process using the same

Abstract

There is disclosed a sulfonate shown by the following general formula (2). R1—COOC(CF3)2—CH2SO3−M+  (2) (In the formula, R1 represents a linear, a branched, or a cyclic monovalent hydrocarbon group having 1 to 50 carbon atoms optionally containing a hetero atom. M+ represents a cation.) There can be provided: a novel sulfonate which is effective for a chemically amplified resist composition having a sufficiently high solubility (compatibility) in a resist solvent and a resin, a good storage stability, a PED stability, a further wider depth of focus, a good sensitivity, in particular a high resolution and a good pattern profile form; a photosensitive acid generator; a resist composition using this; a photomask blank, and a patterning process.

Dependencies are inferred from the claim text.