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The PAG as component (B) may further contain a com› pound having the following formula (B-3). 

Herein A 3 and A 4 are each independently hydrogen or trifluoromethyl, excluding that both A 3 and A 4 are hydrogen at the same time. R$^{25 }$is a C$_{1 }$-C$_{35 }$straight, branched or cyclic monovalent hydrocarbon group which may contain oxygen, a nitrogen-containing heterocyclic group, or a group of the formula (i). MB+ is an onium cation. 

Examples of the monovalent hydrocarbon group and nitrogen-containing heterocyclic group represented by R 25 are as exemplified above for R 21 . Examples of the onium cation MB+ are as exemplified above for MA+. 

Exemplary structures of the anion moiety in the PAG having formula (B-3) are shown below, but not limited thereto. 

<img src='content_image/894428.jpg'>

<img src='content_image/894422.jpg'>

