Infrared reflective patterned product including oriented tabular metal particles
An infrared reflective patterned product includes an infrared reflective pattern portion which has an infrared reflective material in a region constituting at least a part of a support. The infrared reflective pattern portion has an uneven structure which includes a plurality of protruding or recessed portions. Metal particles are contained on surfaces of the protruding or recessed portions. The particles include 60 number-percent or greater of tabular metal particles in a hexagonal or circular shape, and the tabular particles which are plane-oriented so that an angle between a principal plane of the particle and a surface of the uneven structure closest to the particle is in a range of 0° to ±30° are adjusted to be 50 number-percent or greater of all tabular metal particles. In the patterned product, the ratio of the reflectance of the infrared reflective pattern portion at a wavelength with the highest reflectance in an infrared region of 780 nm to 2500 nm to the reflectance of a non-pattern portion is large in a case where the infrared reflective pattern portion is obliquely irradiated with infrared rays.
1. An infrared reflective patterned product comprising:
an infrared reflective pattern portion which includes an infrared reflective material in a region constituting at least a part of a support,
wherein the infrared reflective pattern portion has an uneven structure that includes a plurality of protruding portions or recessed portions,
at least one type of metal particles are contained on at least one surface from among the protruding portions or recessed portions of the uneven structure of the infrared reflective pattern portion,
the metal particles include 60 number-percent or greater of tabular metal particles in a hexagonal shape or a circular shape, and
the tabular metal particles which are plane-oriented so that an angle between a principal plane of the tabular metal particle and a surface of the uneven structure closest to the tabular metal particle is in a range of 0° to ±30° are adjusted to be 50 number-percent or greater of all tabular metal particles.
2. The infrared reflective patterned product according to claim 1 , further comprising:
an overcoat layer which fills the uneven structure on a surface side provided with the infrared reflective pattern portion on the support.
3. The infrared reflective patterned product according to claim 2 ,
wherein a difference in refractive index between the overcoat layer and the support is 0.05 or less.
4. The infrared reflective patterned product according to claim 2 ,
wherein the support and the overcoat layer are transparent.
5. The infrared reflective patterned product according to claim 1 ,
wherein the uneven structure is in a prism shape, a pyramidal prism shape, a hemispherical shape, or a corner cube shape.
6. The infrared reflective patterned product according to claim 1 ,
wherein the size of the uneven structure is in a range of 1 μm to 100 μm.
7. The infrared reflective patterned product according to claim 1 ,
wherein the infrared reflective pattern portion in an infrared region of 780 nm to 2500 nm has a maximum reflectance of 20% or greater.
8. The infrared reflective patterned product according to claim 1 ,
wherein the infrared reflective patterned product has a transmittance at 550 nm of 60% or greater.
9. The infrared reflective patterned product according to claim 1 ,
wherein a wavelength with a highest reflectance in an infrared region of 780 nm to 2500 nm is present in a band of 780 nm to 1100 nm.
10. The infrared reflective patterned product according to claim 1 which is a sheet to be mounted on a surface or a front of a display device capable of displaying an image.