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

Claim 2:
3. The molecular resist composition of claim 2 wherein the betaine type onium compound has the formula (A-1):, wherein a, k, Q1 to Q4, L1, L2, XL1, and R1 are as defined above, R2A and R3A are each independently a C1-C40 monovalent hydrocarbon group which may contain a heteroatom, b is an integer of 0 to 5, c is an integer of 0 to 4,
in case of b ≥2, R2A may be identical or different and two R2A may bond together to form a ring with the atoms to which they are attached, in case of c≥2, R3A may be identical or different and two R3A may bond together to form a ring with the atoms to which they are attached.