Patent ID: 7488565

Claim:
A positive-acting photoresist composition comprising a base resin polymerized from any of the following monomers: wherein R 1 is selected from the group consisting of —H and —CH 3 ; R 2 is selected from the group consisting of —H, an alkyl group having from 1 to 4 carbon atoms, and an alkoxy group having from 1 to 4 carbon atoms; R 3 is —H, or a hydrophilic-enhancing moiety selected from the group consisting of a hydroxyl group —OH, a keto group ═O, carboxylic acid group —COOH, and alkoxy group —OR 4 , and a group —OC(O)OR 4 ; R 4 is —CH 3 or —C 2 H 5 .