Jul.  18,  2019  54  US 2019/0219920 Al  thereto (i.e., the carbon atom adjacent to the sulfur atom  within Rd $^{2 }$group does not substituted with a fluorine atom).  As a result, the anion of the component ( dl-2) becomes an  appropriately weak acid anion, thereby improving the  quenching ability of the component (D).  [0453]  As Rd 2 ,  a chain-like alkyl group which may have  a substituent or an aliphatic cyclic group which may have a  substituent is preferable. The chain-like alkyl group prefer› ably has 1 to 10 carbon atoms, and more preferably  3  to 10  carbon atoms. As the aliphatic cyclic group, a group in  which one or more hydrogen atoms have been removed from  adamantane, norbomane, isobomane, tricyclodecane, tetra› cyclododecane or camphor (which may have a substituent)  is more preferable.  [0454]  The hydrocarbon group for Rd $^{2 }$may have a sub› stituent. As the substituent, the same groups as those  described above for substituting the hydrocarbon group  ( e.g., aromatic hydrocarbon group, aliphatic cyclic group,  chain-like alkyl group) for Rd$^{1 }$in the formula (dl-1) can be  mentioned.  [0455]  Specific examples of preferable anion moieties for  the component (dl-2) are shown below.  [0446]  -Cation Moiety  [0447]  In formula (dl-1),  Mm+  represents an organic cat› ion having a valency of m. As the organic cation for  Mm+,  for example, the same cation moieties as those represented  by the aforementioned formulae (ca-1) to (ca-5) are prefer› able, cation moieties represented by the aforementioned  general formulae ( ca-1) is preferable, and cation moieties  represented by the aforementioned formulae (ca-1-1) to  ( ca-1-72) are still more preferable.  [0448]  As the component (d 1-1), one kind of compound  may be used, or two or more kinds of compounds may be  used in combination.  [0449]  {  Component ( dl-2)}  [0450]  -Anion Moiety  [0451]  In formula (dl-2), Rd $^{2 }$represents a cyclic group  which may have a substituent, a chain-like alkyl group  which may have a substituent or a chain-like alkenyl group  which may have a substituent, and is the same groups as  those defined above for R$^{101 }$in the aforementioned formula  (b-1 ).  [0452]  provided that, the carbon atom adjacent to the  sulfur atom within Rd $^{2 }$group has no fluorine atom bonded  [Chemical Formula 53]  so!f  rn  0~ 0 o~ 0  C-t:7Y  S03  S03  0  -continued  0  fforroe  0  0~  jL  oe  r{’l  0  Orr  MY  0  0  g  oe  ~  oe  y  y  0  0  HOYYCF3  n~  Oroe  0  0  8  HO--Or 0 e  ~oe  0  0  HO  -o  CF3  0 