Patent ID: 6667145
Filing Date: 2003-12-23
Classification: G03F,Y10S

Abstract:
A resist composition comprising as a base resin a polymer comprising the following general formula (1-1) or (1-2) and having a weight average molecular weight of 1,000 to 500,000, whereinR1 is hydrogen, methyl, or CO2R2, R2 is a straight, branched or cyclic alkyl group of 1 to 15 carbon atoms, R3 is hydrogen, methyl, or CH2CO2R2, at least one of R4 to R7 is a carboxyl or hydroxyl-containing monovalent hydrocarbon group of 1 to 15 carbon atoms, and the reminder are independently hydrogen or a straight, branched or cyclic alkyl group of 1 to 15 carbon atoms, or R4 to R7, taken together, may form a ring, and when they form a ring, at least one of R4 to R7 is a carboxyl or hydroxyl-containing divalent hydrocarbon group of 1 to 15 carbon atoms, and the reminders are independently a single bond or a straight, branched or cyclic alkylene group of 1 to 15 carbon atoms, at least one of R8 to R11 is a monovalent hydrocarbon group of 2 to 15 carbon atoms containing a â€”CO2â€” partial structure, and the reminders are independently hydrogen or a straight, branched, or cyclic alkyl group of 1 to 15 carbon atoms, or R8 to R11, taken together, may form a ring, and when they form a ring, at least one of R8 to R11 is a divalent hydrocarbon group of 1 to 15 carbon atoms containing a â€”CO2â€” partial structure, and the reminders are independently a single bond or a straight, branched or cyclic alkylene group of 1 to 15 carbon atoms, R12 is a polycylcic hydrocarbon group of 7 to 15 carbon atoms or an alkyl group containing such polycyclic hydrocarbon group, R13 is an acid labile group containing a group of the following general formula (3): wherein R15 is a straight, branched or cyclic alkyl group of 1 to 8 carbon atoms or substituted or unsubstituted aryl group of 6 to 20 carbon atoms, R16 to R25 are independently hydrogen or monovalent hydrocarbon groups of 1 to 15 carbon atoms which may contain a hetero atom, or R16 to R25, taken together, may form a ring, and R16 to R25 represent divalent hydrocarbon groups of 1 to 15 carbon atoms which may contain a hetero atom when they form a ring, or two of R16 to R25 which are attached to adjoining carbon atoms may bond together directly to form a double bond, k is equal to 0 or 1, x is a number from more than 0 to 1, â€œaâ€  to â€œcâ€  are numbers from 0 to less than 1 and â€œdâ€  is a number from 0.1 to 0.9, satisfying x+a+b+c+d=1, and â€ƒwherein â€ƒof the formula (1-1) or of the formula (1-2) is selected from the group consisting of: