ALKYLPHTHALOCYANINE NEAR-INFRARED ABSORBERS AND RECORDING/DISPLAY MATERIALS USING THE SAME

Abstract: Near-infrared absorbers which contain phthalocyanine derivatives in which the four benzene rings contained in the molecule independently have 1 to 4 substituents are light and thermal resistant and possess high molar extinction coefficients. Such near-­ infrared absorbers are useful in optical recording media, near-infrared absorption filters, and liquid crystal display devices.

Description: BACKGROUND OF THE INVENTION Field of the Invention: The present invention relates to alkylphthalocyanine near-infrared absorbers. It also relates to recording and display materials fabricated with such near-infrared absorbers, including optical recording media (such as optical disks and optical cards), filters which absorb or screen near-infrared radiation (such as goggles), and liquid crystal display panels using near-infrared radiation. Discussion of the Background: Near-infrared absorbers play an important role in optoelectronic applications such as information recording media, display media, sensors, and goggles. Conventionally known near-infrared absorbers include cyanine dyes (Japanese Patent Laid-Open Nos. 46221/'81 and 112790/'83), phthalocyanine dyes (Japanese Patent Laid-Open No. 36490/'83), naphthoquinone dyes (Japanese Patent Laid-Open No. 15458/'85), anthraquinone dyes (Japanese Patent Laid-Open No. 291651/'86), and dithiol complexes (Japanese Patent Laid-Open No. 175693/'83). However, the previously known dyes suffer from major disadvantages. Specifically, cyanine dyes are insufficient in fastness properties such as light resistance and thermal resistance. The absorption wavelength ranges of phthalocyanine dyes are as short as 600-700 nm. Anthraquinone and naphthoquinone dyes have a low molar extinction coefficient, on the order of several tens of thousands. Dithiol complexes are not sufficiently thermally stable and possess low molar extinction coefficients. "Recently, phthalocyanine compounds having substituents have been disclosed in WO 88/06175 and US-A-4,529,688. WO 88/06175 discloses a phthalocyanine having a discotic liquid crystal property. However, there is a problem in stability when the phthalocyanine is used for an optical recording material. US-A-4,529,688 discloses a phthalocyanine substituted by 1 to 3 tert-butyl groups. However, it is difficult to prepare a recording film using the phthalocyanine alone. Moreover, the recording film thus obtained is insufficient in reflectance." Thus, there remains a need for near-infrared absorbers which possess a sufficient degree of fastness properties, such as light resistance, weather resistance, and thermal resistance, and sufficiently high molar extinction coefficients. SUMMARY OF THE INVENTION It is, therefore, an object of the present invention to provide near-infrared absorbers which absorb light in the near-infrared region of 700 to 850 nm, have excellent light resistance, weather resistance, and thermal resistance and possess high molar extinction coefficients. It is another object of the present invention to provide an optical recording medium containing such a near-infrared absorber in the recording layer thereof, a neat-infrared absorption filter containing such a near-infrared absorber, and a display material comprising a mixture of such a near-infrared absorber and a liquid crystal material. These and other objects which will become apparent during the course of the following detailed description have been achieved by near-infrared absorbers comprising a phthalocyanine derivative of the formula (I) where R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ independently represent hydrogen, alkyl, arylmethyl, alkoxymethyl, alkylthiomethyl, alkylaminomethyl, dialkylaminomethyl, aryloxymethyl, arylthiomethyl, arylaminomethyl, diarylaminomethyl, or alkylarylaminomethyl, wherein both elements of a pair selected from the group consisting of R¹ and R⁴, R⁵ and R⁸, R⁹ and R¹², and R¹³ and R¹⁶ are not hydrogen; R², R³, R⁶, R⁷, R¹⁰, R¹¹, R¹⁴, and R¹⁵ independently are hydrogen, halogen, alkyl, arylmethyl, alkoxymethyl, alkylthiomethyl, alkylaminomethyl, dialkylaminomethyl, aryloxymethyl, arylthiomethyl, arylaminomethyl, diarylaminomethyl, alkylarylaminomethyl, alkylthio, arylthio, alkoxy, aryloxy, or aryl, no combination of four substituents selected from the group consisting of R¹ to R⁴, R⁵ to R⁸, R⁹ to R¹², and R¹³ to R¹⁶ is a combination of two hydrogen atoms and two alkyl groups, a combination of two hydrogen atoms and two arylmethyl groups, a combination of two hydrogen atoms and two alkoxymethyl groups, a combination of two hydrogen atoms, an alkyl group and an arylmethyl group, a combination of two hydrogen atoms, an alkyl group and an alkoxymethyl group, or a combination of two hydrogen atoms, an arylmethyl group and an alkoxymethyl group; and Met is two hydrogen atoms, a divalent metal atom, a monosubstituted trivalent metal atom, a disubstituted tetravalent metal atom or an oxymetal group. In addition, the present invention also provides an optical recording media containing the present near-infrared absorber in the recording layer thereof, near-infrared absorption filters containing the present near-infrared absorber, and display materials comprising a mixture of the present near-infrared absorber and a liquid crystal material. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be more specifically described below in connection with preferred embodiments. Examples of the alkyl groups represented by R¹ to R¹⁶ in formula (I) include straight-chain, branched and cyclic hydrocarbon radicals having 1 to 20 carbon atoms, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, n-amyl, isoamyl, neopentyl, n-hexyl, cyclohexyl, 2-ethylhexyl, 3,3,5-trimethylhexyl, n-octyl, heptyl, and nonyl groups. Among others, alkyl groups especially suitable for use as R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ are hydrocarbon radicals having 5 to 12 carbon atoms, such as n-amyl, isoamyl, neopentyl, n-hexyl, 2-ethylbutyl, n-heptyl, cyclohexylmethyl, n-octyl, 2-ethylhexyl, n-nonyl, 3,5,5-trimethylhexyl, n-decyl, and 4 -butylcyclohexylmethyl groups. Examples of the arylmethyl groups represented by R¹ to R¹⁶ in formula (I) include benzyl groups having 0 to 5 substituents, such as benzyl, 4-methylbenzyl, 4-ethylbenzyl, 4-propylbenzyl, 4-butylbenzyl, 4-cyclohexylbenzyl, 2-ethylbenzyl, 2-hexylbenzyl, 3-butylbenzyl, methoxybenzyl, methylthiobenzyl, chlorobenzyl, and methylaminobenzyl groups; naphthylmethyl groups having 0 to 9 substituents, such as the ethylnaphthylmethyl group; and heteroarylmethyl groups such as substituted or unsubstituted thienylmethyl, furfuryl and indolylmethyl groups. Among others, arylmethyl groups especially suitable for use as R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ are hydrocarbon radicals having 7 to 12 carbon atoms, such as benzyl, 4-butylbenzyl and naphthylmethyl groups. Examples of the alkoxymethyl groups include methyl groups having a substituent selected from: straight-chain or branched hydrocarbonoxy groups having 1 to 20 carbon atoms, such as methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy, heptyloxy and octyloxy groups; oligoethyloxy derivatives of the general formula R-(OCHY¹CHY²) n -O- (where R represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, Y¹ and Y² independently represent a hydrogen atom, methyl group, chloromethyl group, or alkoxymethyl group, and n is an integer of 1 to 5), such as methoxyethoxy, ethoxyethoxy, propoxyethoxy, butoxyethoxy, phenoxyethoxy, methoxyethoxyethoxy, ethoxyethoxyethoxy, methoxyethoxyethoxyethoxy, hydroxyethyloxy, and hydroxyethoxyethoxy groups; alkylaminoalkoxy groups, such as N,N-dimethylaminoethoxy, N,N-diethylaminoethoxy, N,N-dimethylaminopropoxy groups; and alkylthioalkoxy groups, such as ethylthioethoxy, methylthioethoxy, phenylthioethoxy, methylthiopropoxy and ethylthiopropoxy groups. Examples of the alkylthiomethyl groups include methyl groups having a substituent selected from: straight-chain or branched hydrocarbonthio groups having 1 to 30 carbon atoms, such as methylthio and ethylthio groups; oligoalkoxyalkylthio groups such as methoxymethylthio, methoxyethylthio, ethoxyethylthio, butoxyethylthio, and methoxyethoxyethylthio groups; oligoalkylthioalkylthio groups such as methylthiomethylthio and ethylthioethylthio groups; alkylaminoalkylthio groups such as N,N-dimethylaminoethylthio, N,N-diethylaminoethylthio, and N-methylaminopropylthio groups; and halogenated alkylthio groups such as chloroethylthio, bromoethylthio, iodoethylthio, fluoroethylthio, and dichloroethylthio groups. Examples of the alkylaminomethyl and dialkylaminomethyl groups include methyl groups having a substituent selected from: straight-chain or branched alkyl-substituted amino groups having a total of 1 to 30 carbon atoms, such as methylamino, ethylamino, N,N-dimethylamino, and N,N-diethylamino groups; hydroxyalkylamino groups, such as N-(hydroxyethyl)amino and N,N-di(hydroxyethyl)amino groups; alkoxyalkylamino groups, such as N,N-di(methoxyethyl)amino, N,N-di(ethoxyethyl)amino and N,N-di(methoxyethoxyethyl)amino groups; and acyloxyalkylamino groups, such as the N,N-di(acetoxyethyl)amino group. Examples of the aryloxymethyl groups include methyl groups having a substituent selected from phenyloxy, naphthyloxy, alkylphenyloxy, alkylaminophenyloxy, halogen-substituted phenyloxy, nitrophenyloxy, alkoxyphenyloxy, and alkylthiophenyloxy groups. Examples of the arylthiomethyl groups include methyl groups having a substituent selected from phenylthio, naphthylthio, alkylphenylthio, aminophenylthio, alkylaminophenylthio, and alkoxyphenylthio groups. Examples of the arylaminomethyl and diarylaminomethyl groups include methyl groups substituted with an amino group having one or two substituents selected from phenyl, alkylphenyl alkoxyphenyl, aminophenyl, dialkylaminophenyl, halophenyl, naphthyl, and heterocyclic aromatic groups. Examples of the alkylarylaminomethyl groups include methyl groups substituted with an amino group having aromatic and aliphatic substituent groups, such as phenylmethylamino or naphthylethylamino groups. When the total number of carbon, oxygen, nitrogen, and sulfur atoms present in each of the substituent groups represented by R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ is in the range of 5 to 12, the near-infrared absorbers of the present invention have good solvent solubility, exhibit high molar extinction coefficients in the solution phase, and can give coating films having a high reflectance. Similarly, when the total number of carbon, oxygen, nitrogen, and sulfur atoms present in each of the substituent groups represented by R², R³, R⁶, R⁷, R¹⁰, R¹¹, R¹⁴, and R¹⁵ is in the range of 1 to 6, the near-infrared absorbers of the present invention give coating films having a high reflectance. Examples of the divalent metal represented by Met include Cu, Zn, Fe(II), Co(II), Ni(II), Ru(II), Rh(II), Pd(II), Pt(II), Mn(II), Mg(II), Be(II), Ca(II), Ba(II), Cd(II), Hg(II), and Sn(II). Examples of the mono-substituted trivalent metal include Al-Cl, Al-Br, Al-F, Al-I, Ga-Cl, Ga-F, Ga-I, Ga-Br, In-Cl, In-Br, In-I, In-F, Tl-Cl, Tl-Br, Tl-I, Tl-F, Al-C₆H₅, Al-C₆H₄CH₃, In-C₆H₅, In-C₆H₄CH₃, In-C₁₀H₇, and Mn(OH). Examples of the disubstituted tetravalent metal include CrCl₂, SiCl₂, SiBr₂, SiF₂, ZrCl₂, SiI₂, GeCl₂, GeBr₂, Gel₂, GeF₂, SnCl₂, SnBr₂, SnI₂, SnF₂, TiCl₂, TiBr₂, and TiF₂; Si(OH)₂, Ge(OH)₂, Zr(OH)₂, Mn(OH)₂, and Sn(OH)₂; TiR₂, CrR₂, SiR₂, SnR₂, and GeR₂, where R is an alkyl, phenyl, or naphthyl group or a derivative thereof; Si(OR′)₂, Sn(OR′)₂, Ge(OR′)₂, Ti(OR′)₂, and Cr(OR′)₂, where R′ is an alkyl, phenyl, naphthyl, trialkylsilyl, dialkylalkoxysilyl, or acyl group or a derivative thereof; and Sn(SR″)₂ and Ge(SR″)₂, where R″ is an alkyl, phenyl, or naphthyl group or a derivative thereof. Examples of the oxymetal group include VO, MnO, and TiO. It is preferred that both of R¹ and R⁴, R⁵ and R⁸, R⁹ and R¹², or R¹³ and R¹⁶ should not be hydrogen atoms. When eight or more of the R¹ to R¹⁶ radicals are not hydrogen atoms, the central metal represented by Met preferably is vanadyl(IV) oxide because the resulting phthalocyanine derivatives absorb light in the wavelength range (750-850 nm) of semiconductor lasers. When four or more of the R¹ to R¹⁶ radicals are not hydrogen atoms, a lead or manganese (III) derivative is preferred for the same reason. Suitable manganese derivatives are manganese hydroxide derivatives of the general formula MnOY, such as Mn(OH), Mn[OSi(CH₃)₃], Mn[OSi(C₂H₅)₃], Mn[OSi(C₃H₇)₃], Mn[OSi(C₄H₉)₃], Mn[OSi(C₈H₁₇)₃], Mn[OSn(C₄H₉)₃], Mn[OGe(CH₃)₃], Mn(OCH₃), Mn(OC₆H₅), Mn(OC₂H₄OC₂H₄OC₂H₅), and Mn[OC₂H₄N(CH₃)₂]. The near-infrared absorbers of the present invention, which fall within the scope of formula (I), can be synthesized as follows: One to four intermediates are selected from the compounds represented by the formulas (II) and (III): in which the benzene ring may have one or more substituent groups similar to those defined for formula (I). The intermediate or intermediates are reacted with a metal derivative such as a metal halide, acetate, or sulfate, for example, by heating in a solvent selected from urea, chloronaphthalene, halobenzenes, nitrobenzene, alcohols, and amino-alcohols. In order to make optical recording media using a near-infrared absorber in accordance with the present invention, the near-infrared absorber may be coated or vacuum-deposited onto a transparent substrate. According to one coating process, 0.05 to 20% by weight, preferably 0.5 to 20% by weight, of the near-infrared absorber and up to 20% by weight, preferably 0%, of a binder resin are dissolved in a solvent, and the resulting solution is applied to a substrate by means of a spin coater. According to one vacuum deposition process, the near-infrared absorber is deposited onto a substrate at a pressure of 10⁻⁷ to 10⁻⁵ torr and a temperature of 100 to 300°C. The substrate for the recording medium may be formed of any optically transparent resin. Suitable resins include, for example, acrylic resins, polyethylene resin, vinyl chloride resin, vinylidene chloride resin, polycarbonate resins, ethylene resin, polyolefin copolymer resins, vinyl chloride copolymer resins, vinylidene chloride copolymer resins, and styrene copolymer resins. Moreover, the substrate may be surface-treated with a thermosetting or ultraviolet-curable resin. Solvents suitable for coating purposes include, for example, halogenated hydrocarbons such as dichloromethane, chloroform, carbon tetrachloride, tetrachloroethylene, and dichlorodifluoroethane; ethers such as tetrahydrofuran, diethyl ether, and dibutyl ether; ketones such as acetone and methyl ethyl ketone; alcohols such as methanol, ethanol, and propanol; cellosolves such as methyl cellosolve and ethyl cellosolve; and hydrocarbons such as hexane, cyclohexane, octane, benzene, toluene, and xylene. In order to make near-infrared absorption filters using a near-infrared absorber within the scope of formula (I), various methods may be employed. For example, this can be accomplished by mixing a resin with a compound of formula (I) and molding the mixture; by pouring a mixture of a resin monomer and a compound of formula (I) into a mold and polymerizing the monomer; by dyeing a resin molding with a compound of formula (I); or by coating or vacuum-depositing a compound of formula (I) onto a surface of a substrate material. As the base material of such filters, there may be used any transparent resin. Suitable resins include, for example, thermoplastic resins such as polystyrene, polymethyl methacrylate, polycarbonates, polyethylene, and polypropylene; and thermosetting resins such as CR-39 (a product of PPG, Ltd.), MR-3 and MR-6 (products of Mitsui-Toatsu Chemicals Co., Ltd.). Furthermore, display materials can be made by mixing a near-infrared absorber of formula (I) with liquid crystal materials such as nematic liquid crystals, smectic liquid crystals, and cholesteric liquid crystals. These display materials may be used in guest-host type displays, liquid crystal panels (in which a near-infrared absorber is incorporated in the liquid crystal and an image is written with a laser beam), and the like. Other features of the present invention will become apparent in the course of the following descriptions of exemplary embodiments which are given for illustration of the invention and are not intended to be limiting thereof. EXAMPLES In these examples, all parts are parts by weight. Example 1 A reaction mixture composed of 72 parts of tetramethylphthalonitrile, 11 parts of vanadium(III) chloride, 1 part of ammonium molybdate, and 1,000 parts of 1-chloronaphthalene was heated under reflux at 220°C for 30 hours. Thereafter, the reaction mixture was poured into 3,000 parts of methanol. The precipitated crystals were purified by column chromatography to obtain 30 parts of vanadyloxy hexadecamethylphthalocyanine. Its absorption maximum (λ max ) in CHCl₃ was 732 nm. The results of elemental analysis of the thus-obtained phthalocyanine derivative are given below. C(%) H(%) N(%) Calcd. 71.71 6.02 13.94 Found 71.02 5.91 14.01 Then, a 20 g/l chloroform solution of the same phthalocyanine derivative was prepared. When this solution was spin-coated onto glass, the resulting film has a reflectance of 28% at 810 nm. Moreover, an optical recording medium was made by coating the above solution onto an optical disk substrate formed of a photopolymer. The resulting optical disk exhibited a sensitivity of 50 dB when a record was made with a 780 nm laser beam of 7mW power (on the surface of the substrate) at a rotational speed of 1,800 rpm. This optical disk had good stability to reproducing light and good storage stability. Example 2 A liquid crystal panel was made by using an alkylcyanobiphenyl liquid crystal material of the general formula (where R is an alkyl group) and incorporating therein 0.7% by weight of the phthalocyanine derivative obtained in Example 1. For purposes of comparison, a liquid crystal panel in which the phthalocyanine derivative was not incorporated was also made. For both liquid crystal panels, the thickness of the liquid crystal layer was 10µm. The liquid crystal panel of the present invention gave a greater writing line width than the conventional liquid crystal panel. When the laser output was 20 mW, the liquid crystal panel of the present invention permitted the light pen to write a line of 160 µm width at a light pen traveling speed of 2 cm/sec. The same phthalocyanine derivative could be dissolved in the alkylcyanobiphenyl liquid crystal material at a concentration up to about 2% by weight, and various weathering tests revealed that it possesses a very long service life. Specifically, the liquid crystal material containing the phthalocyanine derivative was placed into capsules, which were allowed to stand under direct sunlight for 100 hours. Thereafter, the liquid crystal material was tested for changes in absorbance and absorption spectrum, but no changes were observed. Thus, this phthalocyanine derivative was found to be very stable. Example 3 One part of the phthalocyanine derivative obtained in Example 1 was dissolved in 10 parts of chloroform, and this solution was coated onto a glass substrate to form a near-infrared absorption filter. This filter has excellent weather resistance. Example 4 A reaction mixture composed of 72 parts of tetramethylphthalonitrile, 25 parts of manganese(II) acetylacetonate, 70 parts of diazabicycloundecene (DBU), 1 part of ammonium molybdate, and 1,000 parts of diethylene glycol was heated at 250°C for 40 hours. Thereafter, the reaction mixture was poured into 10,000 parts of water containing 1,000 parts of hydrochloric acid. The precipitated crystals were filtered off to obtain 50 parts of hydroxymanganese(III) hexadecamethylphthalocyanine, Mn(OH)(C₃₂N₈)(CH₃)₁₆. The results of elemental analysis of the thus-obtained phthalocyanine derivative are given below. C(%) H(%) N(%) Calcd. 71.27 6.11 13.85 Found 71.30 6.09 13.55 A reaction mixture composed of 10 parts of the above hydroxymanganese(III) hexadecamethylphthalocyanine, 25 parts of triisopropylsilyl chloride, and 500 parts of pyridine was heated under reflux for 10 hours. Thereafter, the solvent was removed by distillation, and the residue was extracted with chloroform. Thus, there was obtained 8 parts of triisopropylsilyloxymanganese(III) hexadecamethylphthalocyanine. Its absorption maximum (λ max ) in CHCl₃ was 800 nm. The results of elemental analysis of the thus-obtained phthalocyanine derivative are given below. C(%) H(%) N(%) Calcd. 70.84 7.20 11.70 Found 69.98 7.02 11.50 One part of the above phthalocyanine derivative was dissolved in 100 parts of benzene, and the resulting solution was spin-coated onto a substrate to obtain an optical recording medium. When a record was made with a 780 nm semiconductor laser beam, the optical recording medium exhibited a C/N ratio of 60 dB at a power of 8 mW. No change was observed after the record was reproduced 1,000,000 times with a 0.5 mW laser beam. Moreover, reproduction of the record was not interferred with even after the optical recording medium was allowed to stand at a temperature of 80°C and a relative humidity of 80% for 1,000 hours. Moreover, 5 parts of the above phthalocyanine derivative was mixed with 1,000 parts of polystyrene resin, and the resulting mixture was hot-molded to form a filter. This filter effectively absorbed light in the wavelength range of 700 to 850 nm. Example 5 A reaction mixture composed of 80 parts of 3-n-amylphthalonitrile, 25 parts of manganese(II) acetylacetonate, 70 parts of DBU, 1 part of ammonium molybdate, and 1,000 parts of amyl alcohol was heated under reflux (at 138°C) for 10 hours. Thereafter, the reaction mixture was poured into 10,000 parts of water containing 1,000 parts of concentrated hydrochloric acid. The oily material which separated was extracted with benzene and then washed with n-hexane to obtain 50 parts of hydroxymanganese tetraamylphthalocyanine. Its absorption maximum (λ max ) in CHCl₃ was 740 nm. The results of elemental analysis of the thus-obtained phthalocyanine derivative are given below. C(%) H(%) N(%) Calcd. 72.21 6.64 12.95 Found 71.95 6.32 13.01 A 10 g/l methanol solution of the same phthalocyanine derivative was prepared. When this solution was coated onto an optical disk substrate formed of polycarbonate, the resulting optical disk had a reflectance of 28% and exhibited good sensitivity. Example 6 A reaction mixture composed of 80 parts of 3-n-amylphthalonitrile, 22 parts of lead monoxide, and 1,000 parts of amyl alcohol was heated under reflux for 10 hours. Thereafter, the reaction mixture was poured into water. The precipitated crystals were collected by filtration and then purified by column chromatography to obtain 20 parts of lead(II) tetraamylphthalocyanine. Its absorption maximum (λ max ) in CHCl₃ was 730 nm. The results of elemental analysis of the thus-obtained phthalocyanine derivative are given below. C(%) H(%) N(%) Calcd. 62.45 5.64 11.20 Found 62.10 5.53 11.30 An optical disk was made by spin-coating a 10 g/l n-octane solution of the same phthalocyanine derivative onto a polycarbonate substrate. This optical disk had a reflectance of 30% at 780-830 nm. Moreover, it exhibited a sensitivity of 50 dB when a record was made with a 780 nm laser beam of 7 mW power (on the surface of the substrate) at a rotational speed of 1,800 rpm. Example 7 Forty parts of tetra(p-tert-butylphenyloxymethyl)phthalonitrile, 5 parts of copper acetate, and 10 parts of DBU were reacted by refluxing in chloronaphthalene. Thereafter, the reaction mixture was poured into methanol. Thus, there was obtained 10 parts of copper hexadeca(p-tert-butylphenyloxymethyl)phthalocyanine. The results of elemental analysis of the thus-obtained phthalocyanine derivative are given below. C(%) H(%) N(%) Calcd. 78.77 7.63 3.53 Found 79.01 7.48 3.43 One part of the same phthalocyanine derivative was dissolved in 100 parts of benzene, and the resulting solution was spin-coated onto a substrate to obtain an optical recording medium. This optical recording medium exhibited at C/N ratio of 60 dB and hence had good sensitivity. Example 8 Ten parts of copper hexadecachlorophthalocyanine was reacted with 100 parts of p-tert-butylbenzylmagnesium bromide to obtain 5 parts of copper hexadeca(p-tert-butylbenzyl)phthalocyanine. Its absorption maximum (λ max ) in CHCl₃ was 700 nm. The results of elemental analysis of the thus-obtained phthalocyanine derivative are given below. C(%) H(%) N(%) Calcd. 85.71 5.59 5.55 Found 85.39 5.63 5.43 Example 9 Forty parts of tetra(p-tert-butylphenylthiomethyl)phthalonitrile was reacted with 5 parts of vanadyl trichloride in chloronaphthalene. Thereafter, the reaction mixture was poured into methanol. Thus, there was obtained 5 parts of vanadyloxy hexadeca(p-tert-butylphenylthiomethyl)phthalocyanine. The results of elemental analysis of the thus-obtained phthalocyanine derivative are given below. C(%) H(%) N(%) Calcd. 72.79 7.05 3.26 Found 72.50 6.97 3.00 Example 10 36.4 parts of tetraamylphthalonitrile was reacted with 3 parts of vanadium(III) trichloride by refluxing in 150 parts of chloronaphthalene for 3 hours. Thereafter, the reaction mixture was poured into 3,000 parts of methanol. The precipitated crystals were collected by filtration, dried, and then purified by column chromatography (silica gel/toluene) to obtain 10 parts of vanadyloxy hexadecaamylphthalocyanine. Its absorption maximum (λ max ) in toluene was 740 nm. The results of elemental analysis are given below. C(%) H(%) N(%) Calcd. 79.05 10.43 6.59 Found 78.95 10.13 6.49 For some of the compounds obtained in the foregoing examples, the absorption maximum (λ max ) in solution and in film form, the maximum reflectance in film form, and the durability were evaluated. The thus-obtained results are shown in Table 1. In addition, the results of three comparative examples in which conventional absorbers were evaluated in the same manner are also shown in Table 1. Examples 11 to 77 In these examples, there were used a total of 52 intermediates (Intermediates 1 to 52 shown in Table 2) of the general formula (IV): Using 1 to 4 of these intermediates, a variety of phthalocyanine derivatives were synthesized in the same manner as described in the foregoing examples. The intermediate(s), metal, and reaction conditions used in each example, together with the absorption maximum (λ max ) of the resulting compound in solution, are shown in Table 3. These near-infrared absorbers possess good compatibility with resins and give optical recording media having high sensitivity and good durability. When used in filters, they exhibit desirable spectral characteristics. Moreover, they possess good compatibility with liquid crystal compounds and give high contrast in liquid crystal display devices.

Claims: A near-infrared absorber comprising a phthalocyanine derivative of the formula (I) wherein R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ independently are hydrogen, alkyl, arylmethyl, alkoxymethyl, alkylthiomethyl, alkylaminomethyl, dialkylaminomethyl, aryloxymethyl, arylthiomethyl, arylaminomethyl, diarylaminomethyl or alkylarylminomethyl, wherein both elements of a pair selected from the group consisting of R¹ and R⁴, R⁵ and R⁸, R⁹ and R¹², and R¹³ and R¹⁶ are not hydrogen; R², R³, R⁶, R⁷, R¹⁰, R¹¹, R¹⁴, and R¹⁵ independently are hydrogen, halogen, alkyl, arylmethyl, alkoxymethyl, alkylthiomethyl, alkylaminomethyl, dialkylaminomethyl, aryloxymethyl, arylthiomethyl, arylaminomethyl, diarylaminomethyl, alkylarylaminomethyl, alkylthio, arylthio, alkoxy, aryloxy, or aryl, no combination of four substituents selected from the group consisting of R¹ to R⁴, R⁵ to R⁸, R⁹ to R¹², and R¹³ to R¹⁶ is a combination of two hydrogen atoms and two alkyl groups, a combination of two hydrogen atoms and two arylmethyl groups, a combination of two hydrogen atoms and two alkoxymethyl groups, a combination of two hydrogen atoms, an alkyl group and an arylmethyl group, a combination of two hydrogen atoms, an alkyl group and an alkoxymethyl group, or a combination of two hydrogen atoms, an arylmethyl group and an alkoxymethyl group; and Met is two hydrogen atoms, a divalent metal atom, a monosubstituted trivalent metal atom, a disubstituted tetravalent metal atom or an oxymetal group. The near-infrared absorber of Claim 1, wherein R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ are not hydrogen atoms. The near-infrared absorber of Claim 2, wherein the total number of carbon, oxygen, nitrogen, and sulfur atoms present in each of R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ is in the range of 5 to 12. The near-infrared absorber of Claim 3, wherein R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ independently are alkyl or arylmethyl groups having 5 to 12 carbon atoms. The near-infrared absorber of Claim 2, wherein R¹ to R¹⁶ independently are alkyl, arylmethyl, alkoxymethyl, alkylthiomethyl, alkylaminomethyl, dialkylaminomethyl, aryloxymethyl, arylthiomethyl, arylaminomethyl, diarylaminomethyl, or alkylarylaminomethyl. The near-infrared absorber of Claim 1, wherein R¹ to R¹⁶ independently are alkyl or arylmethyl groups having 5 to 12 carbon atoms. An optical recording medium comprising a recording layer which comprises a near-infrared absorber comprising a phthalocyanine derivative of the formula (I) wherein R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ independently are hydrogen, alkyl, arylmethyl, alkoxymethyl, alkylthiomethyl, alkylaminomethyl, dialkylaminomethyl, aryloxymethyl, arylthiomethyl, arylaminomethyl, diarylaminomethyl or alkylarylaminomethyl, wherein both elements of a pair selected from the group consisting of R¹ and R⁴, R⁵ and R⁸, R⁹ and R¹², and R¹³ and R¹⁶ are not hydrogen; R², R³, R⁶, R⁷, R¹⁰, R¹¹, R¹⁴, and R¹⁵ independently are hydrogen, halogen, alkyl arylmethyl, alkoxymethyl, alkylthiomethyl, alkylaminomethyl, dialkylaminomethyl, aryloxymethyl, arylthiomethyl, arylaminomethyl, diarylaminomethyl, alkylarylaminomethyl, alkylthio, arylthio, alkoxy, aryloxy, or aryl, no combination of four substituents selected from the group consisting of R¹ to R⁴, R⁵ to R⁸, R⁹ to R¹², and R¹³ to R¹⁶ is a combination of two hydrogen atoms and two alkyl groups, a combination of two hydrogen atoms and two arylmethyl groups, a combination of two hydrogen atoms and two alkoxymethyl groups, a combination of two hydrogen atoms, an alkyl group and an arylmethyl group, a combination of two hydrogen atoms, an alkyl group and an alkoxymethyl group, or a combination of two hydrogen atoms, an arylmethyl group and an alkoxymethyl group; and Met is two hydrogen atoms, a divalent metal atom, a monosubstituted trivalent metal atom, a disubstituted tetravalent metal atom or an oxymetal group. The optical recording medium of Claim 7, wherein R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ are not hydrogen atoms. The optical recording medium of Claim 8, wherein the total number of carbon, oxygen, nitrogen, and sulfur atoms present in each of R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ is in the range of 5 to 12. The optical recording medium of Claim 9, wherein R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ independently are alkyl or arylmethyl groups having 5 to 12 carbon atoms. The optical recording medium of Claim 8, wherein R¹ to R¹⁶ independently are alkyl, arylmethyl, alkoxymethyl, alkylthiomethyl, alkylaminomethyl, dialkylaminomethyl, aryloxymethyl, arylthiomethyl, arylaminomethyl, diarylaminomethyl, or alkylarylaminomethyl. The optical recording medium of Claim 7, wherein R¹ to R¹⁶ independently are alkyl or arylmethyl groups having 5 to 12 carbon atoms. A near-infrared absorption filter comprising a near-infrared absorber comprising a phthalocyanine derivative of the formula (I) wherein R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ independently are hydrogen, alkyl, arylmethyl, alkoxymethyl, alkylthiomethyl, alkylaminomethyl, dialkylaminomethyl, aryloxymethyl, arylthiomethyl, arylaminomethyl, diarylaminomethyl or alkylarylaminomethyl, wherein both elements of a pair selected from the group consisting of R¹ and R⁴, R⁵ and R⁸, R⁹ and R¹², and R¹³ and R¹⁶ are not hydrogen; R², R³, R⁶, R⁷, R¹⁰, R¹¹, R¹⁴, and R¹⁵ independently are hydrogen, halogen, alkyl, arylmethyl, alkoxymethyl, alkylthiomethyl, alkylaminomethyl, dialkylaminomethyl, aryloxymethyl, arylthiomethyl, arylaminomethyl, diarylaminomethyl, alkylarylaminomethyl, alkylthio, arylthio, alkoxy, aryloxy, or aryl, no combination of four substituents selected from the group consisting of R¹ to R⁴, R⁵ to R⁸, R⁹ to R¹², and R¹³ to R¹⁶ is a combination of two hydrogen atoms and two alkyl groups, a combination of two hydrogen atoms and two arylmethyl groups, a combination of two hydrogen atoms and two alkoxymethyl groups, a combination of two hydrogen atoms, an alkyl group and an arylmethyl group, a combination of two hydrogen atoms, an alkyl group and an alkoxymethyl group, or a combination of two hydrogen atoms, an arylmethyl group and an alkoxymethyl group; and Met is two hydrogen atoms, a divalent metal atom, a monosubstituted trivalent metal atom, a disubstituted tetravalent metal atom or an oxymetal group. The filter of Claim 13, wherein R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ are not hydrogen atoms. The filter of Claim 14, wherein the total number of carbon, oxygen, nitrogen, and sulfur atoms present in each of R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ is in the range of 5 to 12. The filter of Claim 15, wherein R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ independently are alkyl or arylmethyl groups having 5 to 12 carbon atoms. The filter of Claim 14, wherein R¹ to R¹⁶ independently are alkyl, arylmethyl, alkoxymethyl, alkylthiomethyl, alkylaminomethyl, dialkylaminomethyl, aryloxymethyl, arylthiomethyl, arylaminomethyl, diarylaminomethyl, or alkylarylaminomethyl. The filter of Claim 13, wherein R¹ to R¹⁶ independently are alkyl or arylmethyl groups having 5 to 12 carbon atoms. A liquid crystal display device comprising a near-infrared absorber comprising a phthalocyanine derivative of the formula (I) wherein R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ independently are hydrogen, alkyl, arylmethyl. alkoxymethyl, alkylthiomethyl, alkylaminomethyl, dialkylaminomethyl, aryloxymethyl, arylthiomethyl, arylaminomethyl, diarylaminomethyl or alkylarylaminomethyl, wherein both elements of a pair selected from the group consisting of R¹ and R⁴, R⁵ and R⁸, R⁹ and R¹², and R¹³ and R¹⁶ are not hydrogen; R², R³, R⁶, R⁷, R¹⁰, R¹¹, R¹⁴, and R¹⁵ independently are hydrogen, halogen, alkyl, arylmethyl, alkoxymethyl, alkylthiomethyl, alkylaminomethyl, dialkylaminomethyl, aryloxymethyl, arylthiomethyl, arylaminomethyl, diarylaminomethyl, alkylarylaminomethyl, alkylthio, arylthio, alkoxy, aryloxy, or aryl, no combination of four substituents selected from the group consisting of R¹ to R⁴, R⁵ to R⁸, R⁹ to R¹², and R¹³ to R¹⁶ is a combination of two hydrogen atoms and two alkyl groups, a combination of two hydrogen atoms and two arylmethyl groups, a combination of two hydrogen atoms and two alkoxymethyl groups, a combination of two hydrogen atoms, an alkyl group and an arylmethyl group, a combination of two hydrogen atoms, an alkyl group and an alkoxymethyl group, or a combination of two hydrogen atoms, an arylmethyl group and an alkoxymethyl group; and Met is two hydrogen atoms, a divalent metal atom, a monosubstituted trivalent metal atom, a disubstituted tetravalent metal atom or an oxymetal group. The device of claim 19, wherein R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ are not hydrogen atoms. The device of Claim 20, wherein the total number of carbon, oxygen, nitrogen, and sulfur atoms present in each of R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ is in the range of 5 to 12. The device of Claim 21, wherein R¹, R⁴, R⁵, R⁸, R⁹, R¹², R¹³, and R¹⁶ independently are alkyl or arylmethyl groups having 5 to 12 carbon atoms. The device of Claim 20, wherein R¹ to R¹⁶ independently are alkyl, arylmethyl, alkoxymethyl, alkylthiomethyl, alkylaminomethyl, dialkylaminomethyl, aryloxymethyl, arylthiomethyl, arylaminomethyl, diarylaminomethyl, or alkylarylaminomethyl. The device of Claim 19, wherein R¹ to R¹⁶ independently are alkyl or arylmethyl groups having 5 to 12 carbon atoms.

Inventors: ENOMOTO, KATASHI, ITOH, HISATO, NISHIZAWA, TSUTOMU, OGUCHI, TAKAHISA
Applicants: MITSUI TOATSU CHEMICALS, INC., YAMAMOTO CHEMICALS, INC.
Application year: 1989
Main classification: C09B47
IPC codes: G02B5, C09B47, G09F9, C09K3, C09K19, B41M5, G11B7, C07D487