Adhesive layer, near-infrared absorbing film, laminated structure, lamination body, adhesive composition and method for producing the same

An adhesive composition containing composite tungsten oxide fine particles, a dispersant, a metal coupling agent having an amino group, an organic solvent, an adhesive, and a crosslinking agent, wherein

• the composite tungsten oxide fine particles having lattice constant values of 7.3850 Å or more and 7.4186 Å or less on a-axis, and 7.5600 Å or more and 7.6240 Å or less on c-axis,
• the composite tungsten oxide fine particles having an average particle size of 100 nm or less, and
• the lattice constant values and the average particle size are values after pulverizing the composite tungsten oxide fine particles.

A method for producing an adhesive composition containing composite tungsten oxide fine particles, a dispersant, a metal coupling agent having an amino group, an organic solvent, an adhesive, and a crosslinking agent, the method including:

• heat-treating and pulverizing to produce the composite tungsten oxide fine particles to have a lattice constant in a range of 7.3850 Å or more and 7.4186 Å or less on a-axis, and 7.5600 Å or more and 7.6240 Å or less on c-axis;
• and
• mixing the produced composite tungsten oxide fine particles, the dispersant, the metal coupling agent having an amino group, the organic solvent, the adhesive, and the crosslinking agent while maintaining the above-described range of the lattice constant in the composite tungsten oxide fine particles, to obtain the adhesive composition.