Patent ID: 7129023

Claim:
A photoresist polymer comprising a polymerization repeating unit represented by Formula 1: wherein R 1 , R 2 and R 3 are individually H or CH 3 ; R 4 is linear or branched C 3 –C 10 alkylene group; R 5 , R 6 and R 7 are individually C 1 –C 3 alkoxy group; R 8 , R 9 and R 10 are individually H or CH 3 ; R 11 is linear or branched C 1 –C 3 alkyl group; R 12 is hydrogen; and, a ratio of a:b:c:d falls within a range of 20˜40 mol %:20˜35 mol %:15˜25 mol %:15˜20 mol %.