Patent ID: 11914291
Assignee: SHIN-ETSU CHEMICAL CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A resist composition comprising an acid generator containing a sulfonium salt having the formula (1):, wherein k, m and n are each independently an integer of 1 to 3, p is 0 or 1, q is an integer of 0 to 4, r is an integer of 1 to 3,
XBI is iodine or bromine,
Ra1 is a C1-C20 (k+1)-valent aliphatic hydrocarbon group which may contain at least one moiety selected from the group consisting of ether bond, carbonyl, ester bond, amide bond, sultone ring, lactam ring, carbonate, halogen exclusive of iodine, C6-C12 aryl, hydroxyl, and carboxyl,
X1 is a single bond, ether bond, ester bond, amide bond, carbonyl or carbonate group,
X2 is a single bond or a C1-C20 (m+1)-valent hydrocarbon group which may contain at least one moiety selected from the group consisting of ether bond, carbonyl, ester bond, amide bond, sultone ring, lactam ring, carbonate, halogen exclusive of iodine, hydroxyl, and carboxyl,
X3 is a single bond, ether bond or ester bond,
R1 is a single bond or a C1-C20 saturated hydrocarbylene group which may contain an ether bond, ester bond or hydroxyl,
R2 is a C1-C20 hydrocarbyl group which may contain a heteroatom, in case of r=1, two R2 may be identical or different and may bond together to form a ring with the sulfur atom to which they are attached,
R3 is hydroxyl, carboxyl, nitro, cyano, fluorine, chlorine, bromine, iodine, amino, or a C1-C20 saturated hydrocarbyl, C1-C20 saturated hydrocarbyloxy, C2-C20 saturated hydrocarbylcarbonyloxy, C2-C20 saturated hydrocarbyloxycarbonyl or C1-C4 saturated hydrocarbylsulfonyloxy group, which may contain fluorine, chlorine, bromine, iodine, hydroxyl, amino or ether bond, and
X− is a non-nucleophilic counter ion.