Patent ID: 6596459
Filing Date: 2003-07-22
Classification: G03F

Abstract:
A photosensitive polymer represented by the following formula: wherein R1 is an acid-labile tertiary alkyl ester group, R2 is hydrogen atom, methyl, ethyl, &ggr;-butyrolactone-2-yl ester, &ggr;-butyrolactone-3-yl ester, pantolactone-2-yl ester, mevalonic lactone ester, 3-tetrahydrofuranyl ester, 2,3-propylenecarbonate-1-yl ester, 3-methyl-&ggr;-butyrolactone-3-yl ester or C3 to C20 alicyclic hydrocarbon, a/(a+b+c) is approximately 0.1-0.7, b/(a+b+c) is 0.1Ëœ0.8, c/(a+b+c) is greater than 0 and less than or equal to approximately 0.8, and n is an integer in the range of 0 to 2.