	US 12,351,476 B2
	Infrared absorbing material fine particle dispersion liquid and method for production thereof
Keiichi Sato, Isa (JP); Kenji Fukuda, Isa (JP); Yukihiro Koyama, Isa (JP); Hiroki Nakayama, Isa (JP); and Hideaki Fukuyama, Isa (JP)
Assigned to SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
Appl. No. 17/280,687
Filed by SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
PCT Filed Aug. 27, 2019, PCT No. PCT/JP2019/033534 § 371(c)(1), (2) Date Jul. 28, 2021, PCT Pub. No. WO2020/066426, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 2018-182812 (JP), filed on Sep. 27, 2018.
Prior Publication US 2021/0380433 A1, Dec. 9, 2021
Int. Cl. C01G 41/02 (2006.01); G02B 5/20 (2006.01)

CPC C01G 41/02 (2013.01) [C01P 2004/64 (2013.01); C01P 2006/40 (2013.01); C01P 2006/60 (2013.01); C01P 2006/80 (2013.01); G02B 5/208 (2013.01)]

12 Claims

1. An infrared absorbing material fine particle dispersion liquid comprising:

infrared absorbing material fine particles containing fine particles of composite tungsten oxide represented by a general formula MxWOy in which M is one or more elements selected from Cs, Rb, K, TI, and Ba, and x and y satisfy 0.1≤x≤0.5 and 2.2≤y≤3.0;

a dispersant containing an amino acid selected from serine and phenylalanine;

a binder comprising a water-soluble polystyrene, a water-soluble styrene-butadiene copolymer, or an emulsion of a water-soluble acrylate ester copolymer; and

a solvent containing water,

wherein:

an absolute value of a zeta potential of the infrared absorbing material fine particle dispersion liquid is 40 mV or more and 100 mV or less, and

a pH value is 4 or more.