	US 11,835,679 B2
	Powder for forming black light-shielding film and method for manufacturing same
Takashi Konishi, Akita (JP); and Kensuke Kageyama, Akita (JP)
Assigned to MITSUBISHI MATERIALS ELECTRONIC CHEMICALS CO., LTD., Akita (JP)
Appl. No. 16/957,197
Filed by MITSUBISHI MATERIALS ELECTRONIC CHEMICALS CO., LTD., Akita (JP)
PCT Filed Oct. 25, 2018, PCT No. PCT/JP2018/039664 § 371(c)(1), (2) Date Jun. 23, 2020, PCT Pub. No. WO2019/130772, PCT Pub. Date Jul. 4, 2019.
Claims priority of application No. 2017-248647 (JP), filed on Dec. 26, 2017.
Prior Publication US 2020/0319373 A1, Oct. 8, 2020
Int. Cl. G02B 1/00 (2006.01); B22F 9/22 (2006.01); C01B 21/076 (2006.01); G03F 7/004 (2006.01); C22C 32/00 (2006.01); G02B 1/10 (2015.01); G02B 5/00 (2006.01)

CPC G02B 1/00 (2013.01) [B22F 9/22 (2013.01); C01B 21/076 (2013.01); C22C 32/0005 (2013.01); G03F 7/0042 (2013.01); G03F 7/0045 (2013.01); B22F 2201/016 (2013.01); B22F 2201/02 (2013.01); B22F 2201/10 (2013.01); B22F 2302/20 (2013.01); G02B 1/10 (2013.01); G02B 5/003 (2013.01)]

6 Claims

1. A powder for forming a black light-shielding film having a specific surface area of 20 to 90 m²/g, which is measured by the BET method, comprising a zirconium nitride powder as a main component, and containing magnesium and aluminum, wherein:

the powder for forming the black light-shielding film comprises:

a nano-particulated zirconium nitride particle and,

an oxidized film layer or a nitride film layer with aluminum and magnesium generated on a surface layer of the nano-particulated zirconium nitride particle, and

the content of the magnesium is 0.01 to 1.0% by mass relative to 100% by mass of the powder for forming the black light-shielding film, and the content of the aluminum is 0.01 to 1.0% by mass relative to 100% by mass of the powder for forming the black light-shielding film.