Patent ID: 11860540
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 recurring units (b1) have the formula (b1) and the recurring units (b2) have the formula (b2):, wherein RA is each independently hydrogen or methyl,
Y1 is a single bond, phenylene, naphthylene, or a C1-C12 linking group containing an ester bond and/or lactone ring,
Y2 is a single bond or ester bond,
Y3 is a single bond, ether bond or ester bond,
R11 and R12 each are an acid labile group, R13 is a C1-C6 saturated hydrocarbyl group, C1-C6 saturated hydrocarbyloxy group, C2-C6 saturated hydrocarbylcarbonyl group, C2-C6 saturated hydrocarbylcarbonyloxy group, C2-C6 saturated hydrocarbyloxycarbonyl group, halogen, nitro group, or cyano group,
R14 is a single bond or a C1-C6 saturated hydrocarbylene group in which some carbon may be replaced by an ether bond or ester bond,

a is 1 or 2, b is an integer of 0 to 4, and 1≤a+b≤5.