US 11,787,949 B2
Infrared absorbing fine particle dispersed powder, dispersion liquid containing infrared absorbing fine particle dispersed powder, ink containing infrared absorbing fine particle dispersed powder, and anti-counterfeit ink, and anti-counterfeit printed matter
Hirofumi Tsunematsu, Isa (JP); and Takeshi Chonan, Isa (JP)
Assigned to SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
Appl. No. 16/633,987
Filed by SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
PCT Filed Jul. 23, 2018, PCT No. PCT/JP2018/027456
§ 371(c)(1), (2) Date Apr. 7, 2020,
PCT Pub. No. WO2019/021992, PCT Pub. Date Jan. 31, 2019.
Claims priority of application No. 2017-142902 (JP), filed on Jul. 24, 2017.
Prior Publication US 2020/0270464 A1, Aug. 27, 2020
Int. Cl. C09C 3/10 (2006.01); B41M 3/14 (2006.01); C01G 41/02 (2006.01); C09D 11/037 (2014.01); C09D 11/101 (2014.01); C09D 11/50 (2014.01); C09D 17/00 (2006.01); B42D 25/382 (2014.01)
CPC C09C 3/10 (2013.01) [B41M 3/14 (2013.01); C01G 41/02 (2013.01); C09D 11/037 (2013.01); C09D 11/101 (2013.01); C09D 11/50 (2013.01); C09D 17/007 (2013.01); B42D 25/382 (2014.10); C01P 2006/20 (2013.01); C01P 2006/60 (2013.01)] 12 Claims
 
1. An infrared absorbing fine particle dispersed powder made of solid media with infrared absorbing fine particles dispersed inside, wherein
the infrared absorbing fine particle dispersed powder has an average particle size of 1 μm or more,
the infrared absorbing fine particles have a dispersed particle size of 1 nm or more and 800 nm or less,
the solid medium is a resin selected from a resin group consisting of polyethylene resin, polypropylene resin, acrylic resin, polystyrene resin, polyisobutylene resin, epoxy resin, polyimide resin, ionomer resin, fluorine resin, urethane resin, ABS resin, polyvinyl alcohol resin, polyvinyl acetate resin, vinyl chloride resin, and vinylidene chloride resin, or a mixture of two or more resins selected from the resin group, or a copolymer of two or more resins selected from the resin group, and
a weight ratio of the resin to the infrared absorbing fine particles (the resin/the infrared absorbing fine particles) is 4 to 7.