84  US 9,551,933 B2  83  (Repeating Unit Having a Polar Group)  The resin (A) may contain a repeating unit having a polar  group, other than the repeating unit represented by formula  (1-12). By containing the repeating unit having a polar  group, for example, the sensitivity of the composition con› taining the resin can be more enhanced. The repeating unit  having a polar group is preferably a non-acid-decomposable  repeating unit (that is, has no acid-decomposable group).  The "polar group" which can be contained in the repeat- IO ing unit having a polar group includes, for example, the  following (1) to ( 4 ). In the following, the "electronegativity"  means a Pauling’s value.  (1) A functional group containing a structure where an  oxygen atom and an atom with the electronegativity differ› ence from oxygen atom being 1.1 or more are bonded  through a single bond  Examples of this polar group include a group containing  a structure represented by O-H, such as hydroxy group.  (2) A functional group containing a structure where a  nitrogen atom and an atom with the electronegativity dif› ference from nitrogen atom being 0.6 or more are bonded  through a single bond  Examples of this polar group include a group containing  a structure represented by N-H, such as amino group.  (3) A functional group containing a structure where two  atoms differing in the electronegativity by 0.5 or more are  bonded through a double bond or a triple bond  Examples of this polar group include a group containing  a structure represented by C  N, C=O, N=O, S=O or  C  N.  (4) A functional group having an ionic moiety  Examples of this polar group include a group having a  moiety represented by N+ or s+.  Specific examples of the partial structure which can be  contained in the "polar group" are illustrated below.  -OH -COOR -C- -C-O- 11  II  0  0  I  -o-c-o- -CN -NC -C=N  11  0  \  I  I  I  ;  -C-N -O-C-N  -N-C-N  II  \  0  -C-N-C- M  I  M  0  II  -S- Ii  0  0  -S- Ii  0  0  II  II  II  \  0  H  -N- 0  II  /  -S-N  II  \  0  II  \  0  0  II  -S-O- Ii  0  TI  I 0  -S-N-S- -S-N-C- -N- M  I  M  II  I II  I  0  0  [  0  I 0  -coo-,- 0  10  l  -S03 -,- /  0  X  -N' 0X  \  -continued  The content of the repeating unit represented by formula  ( 4) in the resin (A) is preferably from 1 to 40 mo! %, more  preferably from 2 to 30 mo! %, still more preferably from 5  to 25 mo! %, based on all repeating units in the resin (A). 65  It is also preferred that the resin (A) further contains the  following repeating units as other repeating units. 