Patent ID: 6509134
Filing Date: 2003-01-21
Classification: G03F,Y10S

Abstract:
A copolymer prepared by copolymerization of a first monomer having the structure (I) wherein r is zero or 1, and R1, R2, R3 and R4 are independently selected from the group consisting of hydrogen, hydroxyl, lower alkyl, fluorinated lower alkyl, â€”Oâ€”(CO)-(lower alkyl), â€”CN, â€ƒâ€”(L)nâ€”CR12R13â€”OR7â€ƒâ€ƒ(VIII)wherein m is in the range of 1 to 3, n is zero or 1, R7 is hydrogen, lower alkyl, fluorinated lower alkyl, lower alkyl substituted with a tri(lower alkyl)silyl group, or an acid-cleavable substituent, R8 and R9 are lower alkyl or are linked to form a five-or six-membered heterocyclic ring that optionally contains an additional heteroatom, R10 and R11 are lower alkyl or are linked to form a five-or six-membered heterocyclic ring that may or may not contain an additional heteroatom and/or a carbonyl moiety, R12 and R13 are hydrogen, lower alkyl, or fluorinated lower alkyl, R14 is lower alkyl, fluorinated lower alkyl, lower alkyl substituted with a tri(lower alkyl)silyl group, or an acid-cleavable substituent, n is zero or 1, and L is a linking group; anda second monomer having the structure (II) â€ƒwherein R5 is fluoro, methyl or trifluoromethyl, and R6 is â€”COOH, â€”CN, an amide, an acid-inert ester, or an acid-cleavable functionality.