US 12,287,501 B2
Light-absorbing composition, light-absorbing film, and optical filter
Yuichiro Kubo, Tokyo (JP); Katsuhide Shimmo, Kanagawa (JP); Lei Cai, Kanagawa (JP); and Hitomi Masuda, Tokyo (JP)
Assigned to NIPPON SHEET GLASS COMPANY, LIMITED, Tokyo (JP)
Appl. No. 17/595,687
Filed by Nippon Sheet Glass Company, Limited, Tokyo (JP)
PCT Filed May 20, 2020, PCT No. PCT/JP2020/020005
§ 371(c)(1), (2) Date Nov. 22, 2021,
PCT Pub. No. WO2020/235610, PCT Pub. Date Nov. 26, 2020.
Claims priority of application No. 2019-096708 (JP), filed on May 23, 2019.
Prior Publication US 2022/0214481 A1, Jul. 7, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 5/00 (2006.01); C08K 5/5317 (2006.01); C09D 5/32 (2006.01); C09D 7/63 (2018.01); C09D 183/04 (2006.01); G02B 5/20 (2006.01)
CPC G02B 5/208 (2013.01) [C08K 5/5317 (2013.01); C09D 5/32 (2013.01); C09D 7/63 (2018.01); C09D 183/04 (2013.01); G02B 5/003 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A light-absorbing composition comprising:
a light absorber including a phosphonic acid represented by the following formula (A) and copper ion; and
a curable resin,

OG Complex Work Unit Chemistry
where R1 to R5 are each independently a hydrogen atom, a halogen atom, a hydroxy group, or a nitro group, and n represents an integer of 1 to 3, wherein
the light-absorbing composition is capable of being cured to form a light-absorbing film,
the light-absorbing film has a first transmittance spectrum for a transmitted light with respect to an incident light with a wavelength range of 300 nm to 1200 nm at an incident angle of 0°, and
the first transmittance spectrum satisfies the following requirements (i), (ii) and (iii):
(i) a UV cut-off wavelength which lies in the wavelength range of 350 nm to 450 nm and at which a spectral transmittance is 50% is in the wavelength range of 400 nm to 450 nm;
(ii) an IR cut-off wavelength which lies in the wavelength range of 600 nm to 750 nm and at which a spectral transmittance is 50% is in the wavelength range of 700 nm or less; and
(iii) a difference determined by subtracting the UV cut-off wavelength from the IR cut-off wavelength is 240 nm or more.