Patent ID: 11880136
Assignee: SHIN-ETSU CHEMICAL CO., LTD.
Field: Optics (Instruments)
Classification: CPC G  C | IPC C  G

Claim 1:
2. The resist composition of claim 1 wherein the repeat unit AU has the formula (AU), the repeat unit FU-1 has the formula (FU-1), and the repeat unit FU-2 has the formula (FU-2):, , wherein n1 is 1 or 2, n2 is a positive number in the range: 0<n2/n1≤1, n3 is 1 or 2,
RA is each independently hydrogen or methyl,
X1A is a single bond, phenylene group, ester bond or amide bond,
X1B is a single bond or a C1-C20 (n1+1)-valent hydrocarbon group which may contain an ether bond, carbonyl moiety, ester bond, amide bond, sultone ring, lactam ring, carbonate bond, halogen, hydroxy moiety or carboxy moiety,
X2A is a single bond, phenylene, —O—, —C(═O)—O— or —C(═O)—NH—,
X2B is a C1-C12 (n3+1)-valent saturated hydrocarbon group or (n3+1)-valent aromatic hydrocarbon group, which may contain fluorine, hydroxy moiety, ester bond or ether bond,
X3 is a single bond, phenylene, —O—, —C(═O)—O—X31—X32— or —C(═O)—NH—X31—X32—, X31 is a single bond or C1-C4 alkanediyl group, X32 is a single bond, ester bond, ether bond or sulfonamide bond,
R1, R2 and R3 are each independently hydrogen, a C1-C12 alkyl group, C2-C12 alkenyl group, C6-C12 aryl group or C7-C12 aralkyl group, a pair of R1 and R2 or R1 and X1B may bond together to form a ring with the nitrogen atom to which they are attached, the ring may contain oxygen, sulfur, nitrogen or a double bond,
R4 is a single bond, ester bond, or a C1-C12 saturated hydrocarbylene group in which some or all of the hydrogen atoms may be substituted by fluorine and some carbon may be replaced by an ester bond or ether bond,
R5 is hydrogen, fluorine, methyl, trifluoromethyl or difluoromethyl, a pair of R5 and R6 may bond together to form a ring with the carbon atom to which they are attached, the ring may contain an ether bond, fluorine or trifluoromethyl,
R6 is hydrogen or an acid labile group,
R7 is a C1-C20 hydrocarbyl group which is substituted with at least one fluorine, and in which some carbon may be replaced by an ester bond or ether bond, and
X− is a sulfonamide anion containing fluorine, but not iodine and bromine, a phenoxide anion containing fluorine, but not iodine and bromine, or an enolate anion of β-diketone containing fluorine, but not iodine and bromine.