	US 11,807,766 B2
	Anti-counterfeit ink composition, anti-counterfeit ink, anti-counterfeit printed matter, and method for producing the anti-counterfeit ink composition
Mika Okada, Isa (JP); Hirofumi Tsunematsu, Isa (JP); and Takeshi Chonan, Isa (JP)
Assigned to SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
Appl. No. 16/624,078
Filed by SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
PCT Filed Jun. 19, 2018, PCT No. PCT/JP2018/023319 § 371(c)(1), (2) Date Feb. 12, 2020, PCT Pub. No. WO2018/235820, PCT Pub. Date Dec. 27, 2018.
Claims priority of application No. PCT/JP2017/022543 (WO), filed on Jun. 19, 2017.
Prior Publication US 2020/0172752 A1, Jun. 4, 2020
Int. Cl. C09D 11/50 (2014.01); C08K 3/22 (2006.01); C08K 9/02 (2006.01); C09D 11/037 (2014.01); C09D 11/101 (2014.01); B42D 25/382 (2014.01); B41M 3/14 (2006.01)

CPC C09D 11/50 (2013.01) [C08K 3/22 (2013.01); C08K 9/02 (2013.01); C09D 11/037 (2013.01); C09D 11/101 (2013.01); B41M 3/14 (2013.01); B42D 25/382 (2014.10); C08K 2003/2258 (2013.01); C08K 2201/005 (2013.01)]

11 Claims

1. An anti-counterfeit ink composition containing composite tungsten oxide fine particles obtained through a pulverization and dispersion treatment, wherein

the composite tungsten oxide fine particles are composite tungsten oxide having a hexagonal crystal structure expressed by MxWyOz in which the M is at least one element of Cs and Rb, the W is tungsten, the O is oxygen, and the x, the y, and the z satisfy 0.001≤x/y≤1 and 2.2≤z/y≤3.0,

a lattice constant of the composite tungsten oxide fine particles after the pulverization and dispersion treatment is such that a-axis is 7.3850 Å or more and 7.4186 Å or less, and c-axis is 7.5600 Å or more and 7.6240 Å or less,

an average crystallite size of the composite tungsten oxide fine particles is 10 nm or more and 60 nm or less, and

a value obtained by subtracting the average crystallite size from an average particle size of the composite tungsten oxide fine particles is 20% or less of the average particle size.