Lactone-containing compounds having formula (1) are novel wherein R
1
is H, F, methyl or trifluoromethyl, R
2
and R
3
are monovalent hydrocarbon groups, or R
2
and R
3
may together form an aliphatic hydrocarbon ring, R
4
is H or CO
2
R
5
, R
5
is a monovalent hydrocarbon group, W is CH
2
, O or S, and k
1
is 0 or 1. They are useful as monomers to produce polymers which are transparent to radiation≦500 nm. Radiation-sensitive resist compositions comprising the polymers as base resin exhibit excellent properties including resolution, pattern edge roughness, pattern density dependency and exposure margin.
                            具有公式(1)的含有内酯的化合物是新颖的,其中R1为H,F,甲基或三
氟甲基,R2和R3为一价碳氢基团,或R2和R3可以共同形成脂肪族碳氢环,R4为H或CO2R5,R5为一价碳氢基团,W为
CH2,O或S,k1为0或1。它们可用作单体以产生对辐射≦500 nm透明的聚合物。以该聚合物为基础
树脂的辐射敏感型光阻组合物表现出优异的性能,包括分辨率、图案边缘粗糙度、图案密度依赖性和曝光余量。