Abstract: A near infrared absorptive composition of the present invention contains phosphate compounds represented by Formula (8)-c and Formula (8)-d below; and copper ions. An optical material of the present invention is a material wherein the near infrared absorptive composition is mixed in a resin.

Abstract: A building material is formed from a specific composition containing a phosphoric ester compound represented by the following formulae (8)-c and (8)-d and copper ions, in a resin plate.

Abstract: The optical filter of the present invention is provided with a near infrared light absorption layer that contains a component composed of copper ions and a phosphoric ester compound expressed by the following Formula (10), in which the phosphorus atom content in the near infrared light absorption layer is 0.4 to 1.3 mol per mole of copper ions, and the copper ion content in the near infrared light absorption layer is 2 to 60 wt %.

Abstract: A building material is formed from a specific composition containing a phosphoric ester compound represented by the following formulae (8)-c and (8)-d and copper ions, in a resin plate.

Abstract: A near infrared absorptive composition of the present invention contains phosphate compounds represented by Formula (8)-c and Formula (8)-d below; 1

Abstract: The optical material in accordance with the present invention contains a specific phosphonate monoester compound such as monoethyl 3-methoxy butyl phosphonate, and a metal ion such as a copper ion or rare-earth metal ion. They may be contained in a solvent or resin. The use of such a specific phosphonate monoester compound improves the compatibility with a resin, whereby the metal ion can favorably be dispersed into the resin. Consequently, spectral characteristics can be improved when the optical member is formed into a resin-made optical member.

Abstract: The optical material in accordance with the present invention contains a specific phosphonate monoester compound such as monoethyl 3-methoxybutyl phosphonate, and a metal ion such as a copper ion or rare-earth metal ion. They may be contained in a solvent or resin. The use of such a specific phosphonate monoester compound improves the compatibility with a resin, whereby the metal ion can favorably be dispersed into the resin. Consequently, spectral characteristics can be improved when the optical member is formed into a resin-made optical member.

Abstract: Disclosed herein is a photochromic compound comprising a spirooxazine compound represented by the following general formula (I): ##STR1## wherein R.sup.1 means an alkyl, allyl or alkoxyalkyl group, or a substituted or unsubstituted aralkyl or aryloxyalkyl group, R.sup.2 and R.sup.3 individually denote a substituted or unsubstituted alkyl group, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 stand individually for a hydrogen or halogen atom, or an alkyl, alkoxy, hydroxy, alkoxyalkyl, or substituted or unsubstituted amino group. A photochromic composition comprising the photochromic compound and a phenol derivative, fluorine-containing alcohol or hindered amine type light stabilizer is also disclosed.

Abstract: A photochromic lens is composed of a lens member made of a lens resin; and a photochromic layer applied on at least one side of the lens member and formed of a resin of a three-dimensional network structure. The layer-forming resin contains a spirooxazine compound represented by the following general formula (I): ##STR1## wherein R.sub.1 means a hydrogen or halogen atom or a cyano, C.sub.1-6 alkyl or C.sub.1-6 alkoxy group, and R.sub.2 denotes a C.sub.1-6 alkyl group, --CH.sub.2).sub.n COOH, --CH.sub.2).sub.n CN, substituted arylalkyl group or --CH.sub.2).sub.n COOR in which R is a C.sub.1-6 alkyl group and n stands for an integer of 1-4. The layer-forming resin may additionally contain a phenol resin and/or a phenolic compound. A hard coat layer may optionally be applied on the surface of the photochromic layer.