Patent ID: 11953827
Assignee: SHIN-ETSU CHEMICAL CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 1:
2. The molecular resist composition of claim 1 wherein the betaine type onium compound has the formula (A):, wherein a is an integer of 1 to 5, k is an integer of 0 to 3,
Q1 and Q2 are each independently fluorine or a C1-C6 fluoroalkyl group,
Q3 and Q4 are each independently hydrogen, fluorine or a C1-C6 fluoroalkyl group,
L1 and L2 are each independently a single bond, ether bond, ester bond, sulfonate bond, carbonate bond, or carbamate bond,
XL1 is a single bond or a C1-C40 divalent hydrocarbon group which may contain a heteroatom,
R1 is an acid labile group of acetal form having the formula (A′), in case of a ≥2, R1 may be identical or different and two R1 may bond together to form a ring with the atoms to which they are attached,
R2 is a C1-C50 monovalent hydrocarbon group which may contain a heteroatom,
R3 is a C1-C50 divalent hydrocarbon group which may contain a heteroatom,
any two of the phenyl group to which R1 is attached, R2, and R3 may bond together to form a ring with the sulfur atom to which they are attached.