Patent ID: 11860540
Assignee: SHIN-ETSU CHEMICAL CO., LTD.
Field: Optics (Instruments)
Classification: CPC G  C | IPC C  G

Claim 2:
3. The resist composition of claim 1 wherein the base polymer further comprises recurring units of at least one type selected from recurring units having the formulae (d1) to (d3):, wherein RA is hydrogen or methyl,
Z1 is a single bond, or a C1-C6 aliphatic hydrocarbylene group, phenylene group, naphthylene group, or a C7-C18 group obtained by combining the foregoing, or —O—Z11—, —C(═O)—O—Z11— or —C(═O)—NH—Z11—, Z11 is a C1-C6 aliphatic hydrocarbylene group, phenylene group, naphthylene group, or a C7-C18 group obtained by combining the foregoing, which may contain a carbonyl moiety, ester bond, ether bond or hydroxyl moiety,
Z2 is a single bond or ester bond,
Z3 is a single bond, —Z31—C(═O)—O—, —Z31—O—, or —Z31—O—C(═O)—, Z31 is a C1-C12 hydrocarbylene group, phenylene group or a C7-C18 group obtained by combining the foregoing, which may contain a carbonyl moiety, ester bond, ether bond, bromine or iodine,
Z4 is methylene, 2,2,2-trifluoro-1,1-ethanediyl or carbonyl,
Z5 is a single bond, methylene, ethylene, phenylene, fluorinated phenylene, trifluoromethyl-substituted phenylene group, —O—Z51—, —C(═O)—O—Z51— or —C(═O)—NH—Z51—, Z51 is a C1-C6 aliphatic hydrocarbylene group, phenylene group, fluorinated phenylene group, or trifluoromethyl-substituted phenylene group, which may contain a carbonyl moiety, ester bond, ether bond or hydroxyl moiety,

R21 to R28 are each independently a C1-C20 hydrocarbyl group which may contain a heteroatom, a pair of R23 and R24 or R26 and R27 may bond together to form a ring with the sulfur atom to which they are attached, and
M− is a non-nucleophilic counter ion.