Patent ID: 8389197

Claim:
A composition comprising a plurality of compounds represented by a general formula (I) below: [wherein, in formula (I), R 11 and R 12 each represents, independently, an alkyl group of 1 to 10 carbon atoms or an aromatic hydrocarbon group, and may include a hetero atom in the structure; R 21 to R 24 each represents, independently, a hydrogen atom or an acid dissociable, dissolution inhibiting group, and two of the group of R 21 to R 24 represent a hydrogen atom and the others represents an acid dissociable, dissolution inhibiting group; j and k each represents, independently, an integer of 0 or 1 or more, and j +k is 4 or less; X is a group represented by general formulas (Ia) or (Ib) below], [wherein, in formula (Ia), R 18 and R 19 each represents, independently, an alkyl group of 1 to 10 carbon atoms or an aromatic hydrocarbon group, and may include a hetero atom in the structure; and r, y, and z each represents, independently, an integer of 0 or 1 or more, and r+y+z represents 4 or less], wherein there is substantially no variation in the number of the acid dissociable, dissolution inhibiting groups within molecules of the composition.