A salt represented by the formula (I-Pa):
wherein X
pa
represents a single bond or a C1-C4 alkylene group,
R
pa
represents a single bond, a C4-C36 divalent alicyclic hydrocarbon group or a C6-C36 divalent aromatic hydrocarbon group, and one or more methylene groups in the divalent alicyclic hydrocarbon group can be replaced by —O— or —CO—,
Y
pa
represents a polymerizable group, and
Z
pa+
represents an organic cation.
由公式(I-Pa)表示的盐,其中Xpa代表单一键或C1-C4亚烷基团,Rpa代表单一键、C4-C36二价脂
环烃基团或C6-C36二价
芳香烃基团,且脂
环烃基团中的一个或多个亚甲基基团可以被—O—或—CO—替换,Ypa代表可聚合团,Zpa+代表有机阳离子。