Glitter pigment, pigment-containing composition, and pigment-containing painted product
The present invention provides a glitter pigment suitable for imparting high brightness to reflected light toward a regular reflection direction and reducing unnaturalness caused by an observation angle-dependent variation in reflected light. The glitter pigment according to the present invention includes: a flaky substrate; an optical interference film formed on a surface of the flaky substrate; and fine light scattering particles attached to the optical interference film, wherein reflected light is represented by an L*(15) value of more than 100, a ΔL*(h−s) value of less than 30, and a Δh(h−s) value of less than 40° in an L*C*h color system. The L*(15) value is an L* value of the reflected light toward a 15° direction based on an angular representation in which, when an illuminant is disposed so that an incident angle is 45°, an angle at which light is regularly reflected is defined as 0° and a light incident direction is defined as positive. The ΔL*(h−s) value is a difference in L* between a highlight and shade, and the Δh(h−s) value is a difference in h between a highlight and shade. The Δh value expressed in angle is an angular difference. The highlight is an average of values measured at 15° and 25°, and the shade is an average of values measured at 75° and 110°.
1. A glitter pigment, comprising:
a flaky substrate;
an optical interference film formed on a surface of the flaky substrate; and
fine light scattering particles of an inorganic compound or an organic compound attached to the optical interference film, wherein
the flaky substrate is a glass flake,
the fine light scattering particles have an average particle diameter of 1 nm to 50 nm,
reflected light, as measured using illuminant D65, is represented by an L* (15) value of more than 100, a ΔL* (h−s) value of less than 30, and a Δh (h−s) value of less than 40° in an L*C*h color system, wherein
the L* (15) value is an L* value of the reflected light toward a 15° direction based on an angular representation in which, when the illuminant is disposed so that an incident angle of incident light from the illuminant is 45°, an angle at which the incident light is regularly reflected is defined as 0° and an incident direction of the incident light is defined as 90°,
the ΔL* (h−s) value is a difference obtained by subtracting an average value L* (s) of an L* (75) value of the reflected light toward a 75° direction and an L* (110) value of the reflected light toward a 110° direction from an average value L* (h) of the L* (15) value of the reflected light toward the 15° direction and an L* (25) value of the reflected light toward a 25° direction when the directions are based on the angular representation, and
the Δh (h−s) value is an angular difference between an average value h (h), expressed in angle, of a h (15) value of the reflected light toward the 15° direction and a h (25) value of the reflected light toward the 25° direction and an average value h (s), expressed in angle, of a h (75) value of the reflected light toward the 75° direction and a h (110) value of the reflected light toward the 110° direction when the directions are based on the angular representation.
2. The glitter pigment according to claim 1 , wherein a ratio of the fine light scattering particles to a substrate pigment composed of the flaky substrate and the optical interference film is 0.05 to 1% in terms of mass.
3. The glitter pigment according to claim 1 , wherein an angular difference between a hs (15) value expressed in angle and defined for a substrate pigment composed of the flaky substrate and the optical interference film in the same manner as for the h (15) value and a hue angle hf (15) expressed in angle and defined for the fine light scattering particles in the same manner as for the h (15) value is 60° or less.
4. The glitter pigment according to claim 1 , wherein the h (15) value of the glitter pigment is 20 to 90.
5. The glitter pigment according to claim 4 , wherein
the optical interference film is a titanium oxide film being a single-layer film and
the titanium oxide film has a thickness of 105 nm to 125 nm.
6. A pigment-containing composition, comprising the glitter pigment according to claim 1 .
7. A pigment-containing painted product, comprising:
a substrate material; and
a paint film formed on the substrate material, the paint film containing the glitter pigment according to claim 1 .