Infrared-absorbing composition, infrared-cut filter, and imaging optical system
US10809427B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 2017 |
| Grant date | Oct 20, 2020 |
| Priority date | — |
| Expiry date | Jun 25, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K2201/014
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An infrared-absorbing composition according to the present invention includes: an infrared absorber formed by a phosphonic acid represented by the following formula (a) and copper ion; and a phosphoric acid ester allowing the infrared absorber to be dispersed. The phosphoric acid ester includes at least one of a phosphoric acid diester and a phosphoric acid monoester. R1 is a phenyl group or a phenyl group in which at least one hydrogen atom is substituted by a halogen atom. When molar contents of the phosphonic acid, the copper ion, and the phosphoric acid ester are respectively defined as CA mol, CC mol, and CE mol and a total molar content of reactive hydroxy groups is defined as CH mol, the relations CA/CE<1 and CH/CC>1.95 are satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.