申请人:YOSHIDA Isao
公开号:US20120052440A1
公开(公告)日:2012-03-01
The present invention provides a salt represented by the formula (I):
wherein Q
1
and Q
2
independently each represent a fluorine atom or a C1-C6 perfluoroalkyl group, L
1
and L
2
independently each represent a C1-C17 divalent saturated hydrocarbon group in which one or more —CH
2
— can be replaced by —O— or —CO—, ring W
1
and ring W
2
independently each represent a C3-C36 aliphatic ring, R
2
is independently in each occurrence a C1-C6 alkyl group, R
4
is independently in each occurrence a C1-C6 alkyl group, R
3
represents a C1-C12 hydrocarbon group, t represents an integer of 0 to 2, u represents an integer of 0 to 2, and Z
+
represents an organic counter ion.