Patent ID: 11914294
Assignee: SHIN-ETSU CHEMICAL CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 1:
2. The positive resist composition of claim 1 wherein the repeat units having a carboxy group substituted by an acid labile group have the formula (b1) and the repeat units having a phenolic hydroxy group substituted by an acid labile group 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, 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 are each independently an acid labile group, R13 is fluorine, trifluoromethyl, cyano or a C1-C6 saturated hydrocarbyl group, R14 is a single bond or a C1-C6 alkanediyl group which may contain an ether bond or ester bond, a is 1 or 2, b is an integer of 0 to 4, and a+b is from 1 to 5.