Patent ID: 6524765
Filing Date: 2003-02-25
Classification: G03F,Y10S

Abstract:
A polymer comprising at least one unit of the following formula (1-1) or (1-2) and having a weight average molecular weight of 1,000 to 500,000, wherein R1 is an acid labile group excluding a tert-butyl group, R2 is hydrogen or a straight or branched alkyl group of 1 to 4 carbon atoms, Z is a tetravalent hydrocarbon group of 2 to 10 carbon atoms, and k is equal to 0 or 1, and comprising at least one unit of the following formulae (4-1) to (8-1): wherein k is as defined above,at least one of R3 to R6 is a carboxyl or hydroxyl-containing monovalent hydrocarbon group of 1 to 15 carbon atoms, and the remainders are independently hydrogen or a straight, branched or cyclic alkyl group of 1 to 15 carbon atoms, or R3 to R6, taken together, may form a ring, and when they form a ring, at least one of R3 to R6 is a carboxyl or hydroxyl-containing divalent hydrocarbon group of 1 to 15 carbon atoms, and the remainders are independently a single bond or a straight, branched or cyclic alkylene group of 1 to 15 carbon atoms, at least one of R7 to R10 is a monovalent hydrocarbon group of 2 to 15 carbon atoms containing a â€”CO2â€” partial structure, and the remainders are independently hydrogen or a straight, branched or cyclic alkyl group of 1 to 15 carbon atoms, or R7 to R10, taken together, may form a ring, and when they form a ring, at least one of R7 to R10 is a divalent hydrocarbon group of 1 to 15 carbon atoms containing a â€”CO2â€” partial structure, and the remainders are independently a single bond or a straight, branched or cyclic alkylene group of 1 to 15 carbon atoms, R11 is hydrogen, methyl or CO2R13, R12 is hydrogen, methyl or CH2CO2R13, R13 is a straight, branched or cyclic alkyl group of 1 to 15 carbon atoms, R14 is a polycyclic hydrocarbon group of 7 to 15 carbon atoms or an alkyl group containing such a polycyclic hydrocarbon group, R15 is an acid labile group, and X is CH2 or an oxygen atom.