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

Claim 3:
4. The resist composition of claim 3 wherein the base polymer comprises recurring units having the formula (a1) or recurring units having the formula (a2):, wherein RA is each independently hydrogen or methyl,
Y1 is a single bond, phenylene group, naphthylene group, or C1-C12 linking group containing an ester bond, ether bond or lactone ring,
Y2 is a single bond, ester bond or amide bond,
Y3 is a single bond, ether bond or ester bond,
R11 and R12 each are an acid labile group,
R13 is fluorine, trifluoromethyl, cyano, C1-C6 saturated hydrocarbyl, C1-C6 saturated hydrocarbyloxy, C2-C7 saturated hydrocarbylcarbonyl, C2-C7 saturated hydrocarbylcarbonyloxy, or C2-C7 saturated hydrocarbyloxycarbonyl 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, and b is an integer of 0 to 4.