Near infrared absorbers and display/recording materials using the same
AssigneesMitsui Toatsu Chemicals, Inc., Yamamoto Chemicals, Inc.
InventorsHisao Itoh, Katashi Enomoto, Takahisa Oguchi, Tutomu Nishizawa
Life of this patent
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Abstract
Near infrared absorbers which have a molecular extinction coefficient of 200,000 or more and are represented by the formula (I) ##STR1## wherein each of Y.sup.1, Y.sup.2, Y.sup.3, Y.sup.4, Y.sup.5, Y.sup.6, Y.sup.7 and Y.sup.8 is hydrogen, an alkyl group, alkoxyl group or alkylthio group; each of A.sup.1, A.sup.2, A.sup.3, A.sup.4, A.sup.5, A.sup.6, A.sup.7 and A.sup.8 is hydrogen, halogen, a nitro group, alkyl group, aralkyl group, alkenyl group, alkynyl group, alkoxyl group, aryloxy group, alkylthio group or arylthio group; and Met represents two hydrogen atoms or a metal, are useful for the production of optical display and recording materials.
Claims5
A near infrared absorber having a molecular extinction coefficient of 200,000 or more and represented by the formula (I) ##STR68## wherein one of each pair of Y.sup.1 and Y.sup.2, Y.sup.3 and Y.sup.4, and Y.sup.5 and Y.sup.6, and Y.sup.7 and Y.sup.8 is a branched or cyclic alkoxy group having 4 to 9 carbon atoms and the other is a straight-chain alkoxy group having 4 to 9 carbon atoms or a straight-chain alkylthio group having 4 to 9 carbon atoms;
- each of A.sup.1, A.sup.2, A.sup.3, A.sup.4, A.sup.5 A.sup.6, A.sup.6 and A.sup.8 is independently a hydrogen atom, a halogen atom, a nitro group, a straight-chain, branched or cyclic alkyl group having 1 to 10 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, a straight-chain or branched alkoxy group having 1 to 4 carbon atoms, or a cyclic alkoxy group having 6 to 10 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, a straight-chain, branched or cyclic alkylthio group having 1 to 10 carbon atoms, or an arylthio group having 6 to 20 carbon atoms;
- each pair of A.sup.1 and A.sup.2, A.sup.3 and A.sup.4, A.sup.5 and A.sup.6, and A.sup.7 and A.sup.8 may be bound together so as to form a ring;
- and Met represents two hydrogen atoms, a divalent metal atom, a trivalent monosubstituted or tetravalent disubstituted metal atom, or an oxymetal group.
An optical recording medium, comprising a recording layer which comprises a near infrared absorber having a molecular extinction coefficient of 200,000 or more and represented by the formula (I) ##STR69## wherein one of each pair of Y.sup.1 and Y.sup.2, Y.sup.3 and Y.sup.4, Y.sup.5 and Y.sup.6, and Y.sup.7 and Y.sup.8 is a branched or cyclic alkoxy group having 4 to 9 carbon atoms and the other is a straight-chain alkoxy group having 4 to 9 carbon atoms or a straight-chain alkylthio group having 4 to 9 carbon atoms;
- each of A.sup.1, A.sup.2, A.sup.3, A.sup.4, A.sup.5 A.sup.6, A.sup.7 and A.sup.8 is independently a hydrogen atom, a halogen atom, a nitro group, a straight-chain, branched or cyclic alkyl group having 1 to 10 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, a straight-chain or branched alkoxy group having 1 to 4 carbon atoms, or a cyclic alkoxy group having 6 to 10 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, a straight-chain, branched or cyclic alkylthio group having 1 to 10 carbon atoms, or an arylthio group having 6 to 20 carbon atoms;
- each pair of A.sup.1 and A.sup.2, A.sup.3 and A.sup.4, A.sup.5 and A.sup.6, and A.sup.7 and A.sup.8 may be bound together so as to form a ring;
- and Met represents two hydrogen atoms, a divalent metal atom, a trivalent monosubstituted or tetravalent disubstituted metal atom, or an oxymetal group.
A liquid crystal element comprising a near infrared absorber having a molecular extinction coefficient of 200,000 or more and represented by the formula (I) ##STR70## wherein one of each pair of Y.sup.1 and Y.sup.2, Y.sup.3 and Y.sup.4, Y.sup.5 and Y.sup.6, and Y.sup.7 and Y.sup.8 is a branched or cyclic alkoxy group having 4 to 9 carbon atoms and the other is a straight-chain alkoxy group having 4 to 9 carbon atoms or a straight-chain alkylthio group having 4 to 9 carbon atoms;
- each of A.sup.1, A.sup.2, A.sup.3, A.sup.4, A.sup.5, A.sup.6, A.sup.7 and A.sup.8 is independently a hydrogen atom, a halogen atom, a nitro group, a straight-chain, branched or cyclic alkyl group having 1 to 10 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, a straight-chain or branched alkoxy group having 1 to 4 carbon atoms or a cyclic alkoxy group having 6 to 10 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, a straight-chain, ranched or cyclic alkylthio group having 1 to 10 carbon atoms, or an arylthio group having 6 to 20 carbon atoms;
- each pair of A.sup.1 and A.sup.2, A.sup.3 and A.sup.4 A.sup.5 and A.sup.6, and A.sup.7 and A.sup.8 may be bound together so as to form a ring;
- and Met represents two hydrogen atoms, a divalent metal atom, a trivalent monosubstituted or tetravalent disubstituted metal atom, or an oxymetal group.
A near infrared absorption filter comprising a near infrared absorber having a molecular extinction coefficient of 200,000 or more and represented by the formula (I) ##STR71## wherein one of each pair of Y.sup.1 and Y.sup.2, Y.sup.3 and Y.sup.4 Y.sup.5 and Y.sup.6, and Y.sup.7 and Y.sup.8 is a branched or cyclic alkoxy group having 4 to 9 carbon atoms and the other is a straight-chain alkoxy group having 4 to 9 carbon atoms or a straight-chain alkylthio group having 4 to 9 carbon atoms;
- each of A.sup.1, A.sup.2 A.sup.3 A.sup.4, A.sup.5, A.sup.6 A.sup.7 and A.sup.8 is independently a hydrogen atom, a halogen atom, a nitro group, a straight-chain, branched or cyclic alkyl group having 1 to 10 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, a straight-chain or branched alkoxy group having 1 to 4 carbon atoms, or a cyclic alkoxy group having 6 to 10 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, a straight-chain, branched or cyclic alkylthio group having 1 to 10 carbon atoms, or an arylthio group having 6 to 20 carbon atoms;
- each pair of A.sup.1 and A.sup.2 A.sup.3 and A.sup.4 A.sup.5 and A.sup.6 and A.sup.7 and A.sup.8 may be bound together so as to form a ring;
- and Met represents two hydrogen atoms, a divalent metal atom, a trivalent monosubstituted or tetravalent disubstituted metal atom, or an oxymetal group.
An optical card, comprising a recording layer which comprises a near infrared absorber having a molecular extinction coefficient of 200,000 or more and represented by the formula (I) ##STR72## wherein one of each pair of Y.sup.1 and Y.sup.2 Y.sup.3 and Y.sup.4 Y.sup.5 and Y.sup.6, and Y.sup.7 and Y.sup.8 is a branched or cyclic alkoxy group having 4 to 9 carbon atoms and the other is a straight-chain alkoxy group having 4 to 9 carbon atoms or a straight-chain alkylthio group having 4 to 9 carbon atoms;
- each of A.sup.1, A.sup.2, A.sup.3, A.sup.4 A.sup.5, A.sup.6, A.sup.7 and A.sup.8 is independently a hydrogen atom, a halogen atom, a nitro group, a straight-chain, branched or cyclic alkyl group having 1 to 10 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, a straight-chain or branched alkoxy group having 1 to 4 carbon atoms or a cyclic alkoxy group having 6 to 10 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, a straight-chain, branched or cyclic alkylthio group having 1 to 10 carbon atoms, or an arylthio group having 6 to 20 carbon atoms;
- each pair of A.sup.1 and A.sup.2, A.sup.3 and A.sup.4, A.sup.5 and A.sup.6, and A.sup.7 and A.sup.8 may be bound together so as to form a ring;
- and Met represents two hydrogen divalent metal atom, a trivalent monosubstituted or tetravalent disubstituted metal atom, or an oxymetal group.
Dependencies are inferred from the claim text.