US 11,873,385 B2
Infrared-cut filter
Yuichiro Kubo, Tokyo (JP); and Katsuhide Shimmo, Kanagawa (JP)
Assigned to NIPPON SHEET GLASS COMPANY, LIMITED, Tokyo (JP)
Filed by Nippon Sheet Glass Company, Limited, Tokyo (JP)
Filed on Jul. 6, 2020, as Appl. No. 16/921,627.
Application 16/921,627 is a continuation of application No. 15/762,182, granted, now 10,745,541, previously published as PCT/JP2016/004163, filed on Sep. 13, 2016.
Claims priority of application No. 2015-187295 (JP), filed on Sep. 24, 2015.
Prior Publication US 2020/0332084 A1, Oct. 22, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. C08K 5/521 (2006.01); G02B 5/20 (2006.01); G02B 5/22 (2006.01); G03B 11/00 (2021.01); C08K 5/5317 (2006.01); C08K 3/32 (2006.01)
CPC C08K 5/5317 (2013.01) [C08K 5/521 (2013.01); G02B 5/208 (2013.01); G02B 5/22 (2013.01); G02B 5/223 (2013.01); G03B 11/00 (2013.01); C08K 3/32 (2013.01); C08K 2003/329 (2013.01); C08K 2201/003 (2013.01); C08K 2201/005 (2013.01); C08K 2201/011 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An infrared-cut filter comprising:
a first infrared-absorbing layer comprising:
a compound including a copper ion and a phosphonic acid represented by the following formula (a); and at least one phosphoric acid ester selected from the group consisting of phosphoric acid esters represented by the following formulae (b1) and (b2), wherein
a first molar ratio of a content of phosphorus to a content of copper is within a range of 1.22 to 1.53,
a second molar ratio of a content of the phosphonic acid to a content of the phosphoric acid esters is 0.85 or more and less than 2.50, and
a third molar ratio of a content of the phosphonic acid to a content of copper is within a range of 0.45 to 0.9,

OG Complex Work Unit Chemistry
wherein R1 is an alkyl group with 2 to 4 carbon atoms, R21, R22 and R3 are each a monovalent functional group represented by —(CH2CH2O)nR4, n is an integer of 1 to 25, R4 is an alkyl group with 6 to 25 carbon atoms, and R21, R22 and R3 are same or different functional group.