Resin particle
A resin particle includes a binder resin; a fluorescent colorant A; and a colorant B other than the fluorescent colorant A, in which the resin particle includes a region RA in which a content of the fluorescent colorant A is larger than a content of the colorant B and a region RB in which a content of the colorant B is larger than a content of the fluorescent colorant A.
1. A resin particle comprising:
a binder resin comprising:
a first binder resin comprising polyurethane; and
a second binder resin that is different than the first binder resin, the second binder resin comprising a styrene-acrylic copolymer or a polyester resin;
a fluorescent colorant A; and
a colorant B other than the fluorescent colorant A,
wherein:
the resin particle includes a sea-island structure comprising:
a region RA that forms an island structure in which a content of the fluorescent colorant A is larger than a content of the colorant B, wherein the region RA includes the first binder resin; and
a region RB that forms a sea structure in which a content of the colorant B is larger than a content of the fluorescent colorant A, wherein the region RB includes the second binder resin, and
a ratio VI/VT of a volume average particle diameter VI of the island structure in the sea-island structure to a volume average particle diameter VT of the resin particle is 0.15 or more and 0.80 or less.
2. The resin particle according to claim 1 ,
wherein the ratio VI/VT of the volume average particle diameter VI of the island structure in the sea-island structure to the volume average particle diameter VT of the resin particle is 0.30 or more and 0.65 or less.
3. The resin particle according to claim 1 ,
wherein the fluorescent colorant A is a fluorescent dye.
4. The resin particle according to claim 3 ,
wherein the fluorescent dye contains a fluorescent dye having a maximum fluorescence wavelength in a wavelength range of 580 nm to 650 nm.
5. The resin particle according to claim 1 ,
wherein the colorant B contains a magenta pigment.
6. The resin particle according to claim 5 ,
wherein the colorant B contains two or more magenta pigments.
7. The resin particle according to claim 1 ,
wherein the content of the fluorescent colorant A in the region RA is 80 mass % or more based on a total mass of all colorants contained in the region RA.
8. The resin particle according to claim 1 ,
wherein the content of the fluorescent colorant A in the region RA is 90 mass % or more based on a total mass of all colorants contained in the region RA.
9. The resin particle according to claim 1 ,
wherein the fluorescent colorant A is the only colorant contained in the region RA.
10. The resin particle according to claim 1 ,
wherein the content of the colorant B in the region RB is 80 mass % or more based on a total mass of all colorants contained in the region RB.
11. The resin particle according to claim 1 ,
wherein the content of the colorant B in the region RB is 90 mass % or more based on a total mass of all colorants contained in the region RB.
12. The resin particle according to claim 1 ,
wherein the colorant B is the only colorant contained in the region RB.
13. The resin particle according to claim 1 , wherein:
the content of the fluorescent colorant A in the region RA is 80 mass % or more based on a total mass of all colorants contained in the region RA, and
the content of the colorant B in the region RB is 80 mass % or more based on a total mass of all colorants contained in the region RB.