COPPER PHOSPHONATE COMPOUND, AND INFRARED ABSORPTION MATERIAL AND LAMINATE CONTAINING THE COPPER PHOSPHONATE COMPOUND

摘要

Disclosed is a copper phosphonate compound that can exhibit broad and excellent light absorption in a near infrared region and, at the same time, when mixed with a resin, can realize excellent transparency to visible light. The copper phosphonate compound comprises a copper ion, a first phosphonic acid having a fluorine-containing side chain, and a second phosphonic acid having a side chain of an alkyl structure.