Patent ID: 11880136
Assignee: SHIN-ETSU CHEMICAL CO., LTD.
Field: Optics (Instruments)
Classification: CPC G  C | IPC C  G

Claim 5:
6. The resist composition of claim 1 wherein the base polymer comprises repeat units having the formula (a1) or repeat units having the formula (a2):, , wherein RA is each independently hydrogen or methyl, R11 and R12 each are an acid labile group, R13 is fluorine, trifluoromethyl, a C1-C5 saturated hydrocarbyl group or C1-C5 saturated hydrocarbyloxy group, Y1 is a single bond, phenylene group, naphthylene group, or C1-C12 divalent linking group containing at least one moiety selected from ester bond and lactone ring, Y2 is a single bond or ester bond, and a is an integer of 0 to 4.