Near-infrared absorptive layer-forming composition and multilayer film

A near-infrared absorptive layer-forming composition consisting of:

• (A) at least one near-infrared absorbing dye having the formula (1):
• wherein
• R1 and R2 are each independently a monovalent C1-C20 hydrocarbon group which may contain a heteroatom,
• k is an integer of 0 to 5,
• m is 1,
• n is 1 or 2,
• Z is oxygen, sulfur or C(R′)(R″), R′ and R″ are each independently hydrogen or a monovalent C1-C20 hydrocarbon group which may contain a heteroatom, and
• X− is an anion of the formula (1-3):
• wherein Rc1, Rc2 and Rc3 are each independently fluorine or a monovalent C1-C20 hydrocarbon group which may contain a heteroatom, Rc1 and Rc2 may bond together to form a ring with the linkage to which they are attached, the ring-forming Rc1—Rc2 being a single bond or a divalent hydrocarbon group of 1 to 20 carbon atoms in total which may contain a heteroatom;
• (B) at least one polymer comprising repeat units capable of undergoing crosslinking reaction in the presence of an acid, said repeat units having an oxirane structure and/or oxetane structure;
• (C) at least one solvent;
• (D) an acid generator;
• (E) a crosslinker;
• and
• (F) a surfactant,
• wherein, per 100 parts by weight of the overall polymer, the near-infrared absorbing dye is used in an amount of 49 to 100 parts by weight, the organic solvent is added in an amount of 900 to 20,000 parts by weight, the acid generator is added in an amount of 0.1 to 50 parts by weight, the crosslinker is added in an amount of 0 to 50 parts by weight, and the surfactant is added in an amount of up to 2 parts by weight.