US 11,988,991 B2
Resin fine particle, thermoplastic resin particle, and method for producing resin fine particle
Daisuke Tomita, Minamiashigara (JP); Takahiro Yamashita, Minamiashigara (JP); Yukiaki Nakamura, Minamiashigara (JP); Takahisa Tatekawa, Minamiashigara (JP); and Masaru Takahashi, Minamiashigara (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM BUSINESS INNOVATION CORP., Tokyo (JP)
Filed on Aug. 5, 2020, as Appl. No. 16/985,688.
Claims priority of application No. 2020-024709 (JP), filed on Feb. 17, 2020.
Prior Publication US 2021/0255558 A1, Aug. 19, 2021
Int. Cl. G03G 9/087 (2006.01); G03G 9/08 (2006.01); G03G 9/09 (2006.01)
CPC G03G 9/08755 (2013.01) [G03G 9/0804 (2013.01); G03G 9/0819 (2013.01); G03G 9/0904 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A resin fine particle, comprising:
a polyester resin; and
a basic fluorescent dye having at least one cationic group that is
wherein a volume average particle diameter of the resin fine particle is 0.05 μm or more and 1 μm or less, and
a ratio of the concentration of the basic fluorescent dye in the center of gravity portion of the resin fine particle to the concentration of the basic fluorescent dye in the surface layer portion having a depth of 10 nm or less from the surface of the resin fine particle is 0.8 or more and 1.0 or less.