Patent ID: 6762268
Filing Date: 2004-07-13
Classification: G03F

Abstract:
An acetal group containing norbornene copolymer consisting of the following Formula 1wherein R1 is a C1-12 linear, branched or cyclic alkyl group; R2, R3, R4 and R5 are independently hydrogen, fluorine, methyl or trifluoromethyl; R6 and R7 are independently hydrogen or C1-10 linear or branched alkyl group, â€”(CH2)tâ€”R8, â€”(CH2)tâ€”OR8, â€”(CH2)tâ€”C(O)OR8, â€”(CH2)tâ€”C(O)R8, â€”(CH2)tâ€”OC(O)R8, â€”(CH2)tâ€”OC(O)OR8, or â€”(CH2)tâ€”C(O)OCH2OR8 in which, R8 is hydrogen, fluorine, C1-12 linear, branched, cyclic alkyl group or cyclic alkyl group containing ketone group, and t is an integer of 0 to 6, or R6 and R7 are optionally attached to each other to form a ring; l, m and n are integers whereby the ratio of l/(l+m+n) is from about 0.1 to about 0.99, the ratio of m/(l+m+n) is from about 0 to about 0.3 and the ratio of n/(l+m+n) is from about 0.01 to about 0.6; and o, p, q, r and s each is independently an integer from 0 to 2.