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
Estimating the term…
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.
Claims15
A near infrared absorber having a molecular extinction coefficient of at least 200,000 and represented by the formula (I) ##STR68## 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 independently a hydrogen atom, a straight-chain or branched alkyl group having 1 to 8 carbon atoms, or a branched or cyclic alkoxy group having 4 to 9 carbon atoms, provided that 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 not a pair of hydrogen atoms or alkyl groups simultaneously, or the combination of an alkyl group and a hydrogen atom;
- 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;
- provided that when all 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 are hydrogen atoms, and when 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 the combination of a hydrogen atom and an alkoxy group, said alkoxy group has 4 to 9 carbon atoms and is branched or cyclic;
- and Met represents two hydrogen atoms, a divalent metal atom, a trivalent or tetravalent substituted 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 at least 200,000 and represented by the formula (I) ##STR69## 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 independently a hydrogen atom, a straight-chain or branched alkyl group having 1 to 8 carbon atoms, or a branched or cyclic alkoxy group having 4 to 9 carbon atoms, provided that 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 not a pair of hydrogen atoms or alkyl groups simultaneously, or the combination of an alkyl group and a hydrogen atom;
- 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;
- provided that when all 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 are hydrogen atoms, and when 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 the combination of a hydrogen atom and an alkoxy group, said alkoxy group has 4 to 9 carbon atoms and is branched or cyclic;
- and Met represents two hydrogen atoms, a divalent metal atom, a trivalent or tetravalent substituted metal atom, or an oxymetal group.
A liquid crystal element comprising a near infrared absorber having a molecular extinction coefficient of at least 200,000 and represented by the formula (I) ##STR70## 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 independently a hydrogen atom, a straight-chain or branched alkyl group having 1 to 8 carbon atoms, or a branched or cyclic alkoxy group having 4 to 9 carbon atoms, provided that 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 not a pair of hydrogen atoms or alkyl groups simultaneously, or the combination of an alkyl group and a hydrogen atom;
- 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;
- provided that when all 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 are hydrogen atoms, and when 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 the combination of a hydrogen atom and an alkoxy group, said alkoxy group has 4 to 9 carbon atoms and is branched or cyclic;
- and Met represents two hydrogen atoms, a divalent metal atom, a trivalent or tetravalent substituted metal atom, or an oxymetal group.
A near infrared absorption filter comprising a near infrared absorber having a molecular extinction coefficient of at least 200,000 and represented by the formula (I) ##STR71## 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 independently a hydrogen atom, a straight-chain or branched alkyl group having 1 to 8 carbon atoms, or a branched or cyclic alkoxy group having 4 to 9 carbon atoms, provided that 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 not a pair of hydrogen atoms or alkyl groups simultaneously, or the combination of an alkyl group and a hydrogen atom;
- 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;
- provided that when all 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 are hydrogen atoms, and when 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 the combination of a hydrogen atom and an alkoxy group, said alkoxy group has 4 to 9 carbon atoms and is branched or cyclic;
- and Met represents two hydrogen atoms, a divalent metal atom, a trivalent or tetravalent substituted 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 at least 200,000 and represented by the formula (I) ##STR72## 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 independently a hydrogen atom, a straight-chain or branched alkyl group having 1 to 8 carbon atoms, or a branched or cyclic alkoxy group having 4 to 9 carbon atoms, provided that 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 not a pair of hydrogen atoms or alkyl groups simultaneously, or the combination of an alkyl group and a hydrogen atom;
- 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;
- provided that when all 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 are hydrogen atoms, and when 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 the combination of a hydrogen atom and an alkoxy group, said alkoxy group has 4 to 9 carbon atoms and is branched or cyclic;
- and Met represents two hydrogen atoms, a divalent metal atom, a trivalent or tetravalent substituted metal atom, or an oxymetal group.
Dependencies are inferred from the claim text.