WO2009154141A1 - 水溶性アゾ化合物又はその塩、インク組成物及び着色体 - Google Patents
水溶性アゾ化合物又はその塩、インク組成物及び着色体 Download PDFInfo
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- WO2009154141A1 WO2009154141A1 PCT/JP2009/060740 JP2009060740W WO2009154141A1 WO 2009154141 A1 WO2009154141 A1 WO 2009154141A1 JP 2009060740 W JP2009060740 W JP 2009060740W WO 2009154141 A1 WO2009154141 A1 WO 2009154141A1
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- COLNVLDHVKWLRT-UHFFFAOYSA-N phenylalanine Natural products OC(=O)C(N)CC1=CC=CC=C1 COLNVLDHVKWLRT-UHFFFAOYSA-N 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920000259 polyoxyethylene lauryl ether Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- ILVXOBCQQYKLDS-UHFFFAOYSA-N pyridine N-oxide Chemical compound [O-][N+]1=CC=CC=C1 ILVXOBCQQYKLDS-UHFFFAOYSA-N 0.000 description 1
- 125000000719 pyrrolidinyl group Chemical group 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical compound C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 238000005185 salting out Methods 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- WXMKPNITSTVMEF-UHFFFAOYSA-M sodium benzoate Chemical compound [Na+].[O-]C(=O)C1=CC=CC=C1 WXMKPNITSTVMEF-UHFFFAOYSA-M 0.000 description 1
- 235000010234 sodium benzoate Nutrition 0.000 description 1
- 239000004299 sodium benzoate Substances 0.000 description 1
- DZCAZXAJPZCSCU-UHFFFAOYSA-K sodium nitrilotriacetate Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CC([O-])=O DZCAZXAJPZCSCU-UHFFFAOYSA-K 0.000 description 1
- LROWVYNUWKVTCU-STWYSWDKSA-M sodium sorbate Chemical compound [Na+].C\C=C\C=C\C([O-])=O LROWVYNUWKVTCU-STWYSWDKSA-M 0.000 description 1
- 235000019250 sodium sorbate Nutrition 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
- XNRNJIIJLOFJEK-UHFFFAOYSA-N sodium;1-oxidopyridine-2-thione Chemical compound [Na+].[O-]N1C=CC=CC1=S XNRNJIIJLOFJEK-UHFFFAOYSA-N 0.000 description 1
- HCJLVWUMMKIQIM-UHFFFAOYSA-M sodium;2,3,4,5,6-pentachlorophenolate Chemical compound [Na+].[O-]C1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl HCJLVWUMMKIQIM-UHFFFAOYSA-M 0.000 description 1
- 229950006451 sorbitan laurate Drugs 0.000 description 1
- 235000011067 sorbitan monolaureate Nutrition 0.000 description 1
- 239000001593 sorbitan monooleate Substances 0.000 description 1
- 235000011069 sorbitan monooleate Nutrition 0.000 description 1
- 229940035049 sorbitan monooleate Drugs 0.000 description 1
- 239000001587 sorbitan monostearate Substances 0.000 description 1
- 235000011076 sorbitan monostearate Nutrition 0.000 description 1
- 229940035048 sorbitan monostearate Drugs 0.000 description 1
- 229960005078 sorbitan sesquioleate Drugs 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- PJANXHGTPQOBST-UHFFFAOYSA-N stilbene Chemical class C=1C=CC=CC=1C=CC1=CC=CC=C1 PJANXHGTPQOBST-UHFFFAOYSA-N 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 150000003871 sulfonates Chemical class 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 229940104261 taurate Drugs 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- YODZTKMDCQEPHD-UHFFFAOYSA-N thiodiglycol Chemical compound OCCSCCO YODZTKMDCQEPHD-UHFFFAOYSA-N 0.000 description 1
- 229950006389 thiodiglycol Drugs 0.000 description 1
- 150000003918 triazines Chemical class 0.000 description 1
- JLGLQAWTXXGVEM-UHFFFAOYSA-N triethylene glycol monomethyl ether Chemical compound COCCOCCOCCO JLGLQAWTXXGVEM-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
- DGVVWUTYPXICAM-UHFFFAOYSA-N β‐Mercaptoethanol Chemical compound OCCS DGVVWUTYPXICAM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
- C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
- C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
- C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
- C07D251/40—Nitrogen atoms
- C07D251/54—Three nitrogen atoms
- C07D251/70—Other substituted melamines
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B43/00—Preparation of azo dyes from other azo compounds
- C09B43/12—Preparation of azo dyes from other azo compounds by acylation of amino groups
- C09B43/136—Preparation of azo dyes from other azo compounds by acylation of amino groups with polyfunctional acylating agents
- C09B43/16—Preparation of azo dyes from other azo compounds by acylation of amino groups with polyfunctional acylating agents linking amino-azo or cyanuric acid residues
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/32—Inkjet printing inks characterised by colouring agents
- C09D11/328—Inkjet printing inks characterised by colouring agents characterised by dyes
Definitions
- the present invention relates to a water-soluble azo compound or a salt thereof, an ink composition containing the same, and a colored body colored with these.
- ink ejection methods have been developed as recording methods using an ink jet printer, which is one of the representative methods. All of these generate ink droplets and attach them to various recording materials (paper, film, fabric, etc.) for recording. Since this method has features that the recording head and the recording material are not in direct contact with each other and no noise is generated and is quiet, and it is easy to downsize, increase the speed and color, it has been rapidly spread in recent years. The growth is expected to continue.
- inks such as fountain pens and felt pens and inks for ink jet recording, inks in which a water-soluble dye is dissolved in an aqueous medium have been used.
- a water-soluble organic solvent is generally added to prevent clogging of the ink at the pen tip or the ink discharge nozzle.
- These inks give a recorded image of sufficient density, do not cause clogging of the pen tip and nozzles, have good drying properties on the recording material, have little bleeding, and have excellent storage stability. Is required.
- various fastnesses such as water resistance, moisture resistance, light resistance, and gas resistance are required for the recorded image to be formed.
- Ink jet printer nozzle clogging occurs when the water content in the ink evaporates in the vicinity of the nozzle before other solvents and additives, and the pigment solidifies and precipitates when the composition state is low in water and high in solvents and additives. There are many things that come from doing. Therefore, one of the very important required performances is that solids are not easily deposited even when the ink is evaporated and dried. For this reason, high solubility in solvents and additives is one of the properties required for pigments.
- each dye used in the ink especially Y, M , C are desired to have a hue close to standard and clear.
- the ink is stable for long-term storage, has a high density of the image printed as described above, and is excellent in various fastnesses such as water resistance, moisture resistance, light resistance, and gas resistance.
- the gas resistance means that a gas having an oxidizing action existing in the air reacts with a dye (dye) of a recorded image on the recording material or in the recording material, and discolors the printed image. It is the resistance to the phenomenon of making it happen.
- oxidizing gases ozone gas is considered to be a main causative substance that promotes the discoloration and fading phenomenon of ink jet recorded images. Since this discoloration phenomenon is characteristic of inkjet images, improvement of ozone gas resistance is an important technical issue in this field.
- an ink receiving layer may be provided on the surface of an inkjet special paper which is one of recording papers.
- This ink-receiving layer is often made of a porous white inorganic material in order to expedite ink drying and to reduce bleeding at high image quality. It is noticeable.
- Discoloration of images due to oxidizing gas is often regarded as a problem with ozone gas resistance.
- water resistance and moisture resistance are required characteristics that are relatively easy to improve fastness by improving the recording material. A product having high sharpness required for yellow ink and sufficiently satisfying water resistance, moisture resistance and the like has not yet been obtained.
- Patent Documents 1 to 3 show disclosure examples of these highly fast azo compounds.
- Patent Document 1 discloses a yellow dye that is excellent in moisture resistance, ozone gas resistance, and light resistance.
- Patent Document 2 discloses a yellow pigment that is excellent in printing density, moisture resistance, nitrogen oxide gas resistance, ozone gas resistance, and solubility.
- Patent Document 3 discloses a yellow dye having high solubility and excellent light resistance, moisture resistance, and ozone gas resistance.
- JP 2006-152244 A International Publication No. 2008/053776 Pamphlet International Publication No. 2004/007618 Pamphlet
- the present invention is a water-soluble yellow pigment having high water solubility, various fastnesses such as water resistance and moisture resistance of recorded images, particularly excellent in water resistance, and excellent balance between high sharpness and print density.
- An object is to provide a (compound) and an ink composition containing the same and having good storage stability.
- a water-soluble azo compound represented by the following formula (1) or a salt thereof [In Formula (1), R represents a hydrogen atom, a C1-C4 alkyl group, or a C1-C4 alkoxy group, n represents an integer of 1 to 3, m represents 1 or 2, x represents an integer of 2 to 4,
- Group A is a substituted or unsubstituted C1-C20 aliphatic amino group; a hydroxy-substituted mono- or di-C1-C4 aliphatic amino group; a mono- or dicarboxy-substituted C1-C20 aliphatic amino group; a sulfo-substituted C1-C3 aliphatic An amino group; a substituted or unsubstituted 5- or 6-membered nitrogen-containing heterocyclic group; a substituted or unsubstituted aromatic amino group; or a substituted or unsubstituted aryl C1-C4 al
- the water-soluble azo compound represented by the above formula (1) or a salt thereof of the present invention is extremely excellent in solubility in water. Also, in the process of manufacturing the ink composition, for example, it has a feature of good filterability with respect to a membrane filter, and gives a yellow hue with high saturation and printing density on inkjet recording paper, compared with conventional products. It has the feature of being very clear. Further, the ink composition of the present invention containing this compound has very good storage stability without solid precipitation, change in physical properties, change in hue, etc. after long-term storage.
- a printed matter using the ink composition of the present invention as an ink for ink jet recording has an ideal hue as a yellow hue without selecting a recording material (for example, paper, film, etc.), and a photographic color image Can be reproduced faithfully on paper. Furthermore, even when recording on a recording material coated with a porous white inorganic material such as paper for exclusive use for photographic image quality and film, various fastnesses such as moisture resistance, gas resistance, light resistance, etc. Property, particularly water resistance, and excellent long-term storage stability of photographic-tone recorded images. As described above, the water-soluble azo compound represented by the formula (1) or a salt thereof is extremely useful as a yellow coloring matter for ink, particularly for ink jet recording ink.
- the present invention will be described in detail.
- acidic functional groups such as sulfo groups and carboxy groups are represented in the form of free acids.
- water-soluble azo compound of the present invention or a salt thereof and the “water-soluble azo compound of the present invention” will be simply described.
- the water-soluble azo compound of the present invention represented by the above formula (1) is a yellow dye useful for various recordings, particularly for ink jet recording, and the ink composition of the present invention containing the dye is used for ink jet recording. It is suitable as a yellow ink for use.
- R represents a hydrogen atom, a C1-C4 alkyl group, or a C1-C4 alkoxy group
- n is an integer of 1 to 3
- m is 1 or 2
- x is an integer of 2 to 4, respectively.
- Examples of the C1-C4 alkyl group in R include a straight chain or branched chain group, and a straight chain group is preferable. Specific examples include straight chain such as methyl, ethyl, n-propyl and n-butyl; branched chain such as isopropyl, isobutyl, 1-methylpropyl and t-butyl.
- Examples of the C1-C4 alkoxy group for R include a straight chain or branched chain group, and a straight chain group is preferable. Specific examples include straight chain such as methoxy, ethoxy, n-propoxy and n-butoxy; branched chain such as isopropoxy, isobutoxy, 1-methylpropoxy and t-butoxy.
- R is preferably a hydrogen atom, methyl or methoxy, more preferably a hydrogen atom.
- the substitution position of R is not particularly limited, but when the substitution position of the amino group bonded to the triazine ring is the 1st position, it is the 2nd or 3rd position, the 3rd position for methyl, and the 2nd position for methoxy. preferable.
- n is 1 or 2, and preferably 1.
- n is an integer of 1 to 3, preferably 2.
- x is an integer of 2 to 4, preferably 3.
- the group A is a substituted or unsubstituted C1-C20 aliphatic amino group; a hydroxy-substituted mono- or di-C1-C4 aliphatic amino group; a mono- or dicarboxy-substituted C1-C20 aliphatic amino group; A sulfo-substituted C1-C3 aliphatic amino group; a substituted or unsubstituted 5- or 6-membered nitrogen-containing heterocyclic group; a substituted or unsubstituted aromatic amino group; or a substituted or unsubstituted aryl C1-C4 alkylamino group To express.
- Examples of the substituted or unsubstituted C1-C20 aliphatic amino group in group A include those in which the aliphatic moiety is linear or branched, and linear is preferred.
- the substituent is not particularly limited, and preferred examples include an oxo group and a C1-C4 alkoxy group.
- hydroxy-substituted mono- or di-C1-C4 aliphatic amino group in the group A include those in which the aliphatic moiety is linear or branched, and those that are linear are preferred. Specific examples include hydroxy-substituted mono C1-C4 alkylamino groups such as hydroxyethylamino; hydroxy-substituted diC1-C4 alkylamino groups such as bis- (hydroxyethyl) amino; and the like.
- Examples of the mono- or dicarboxy-substituted C1-C20 aliphatic amino group in the group A include those in which the aliphatic moiety is linear or branched, and those that are linear are preferred.
- the aliphatic amino group is preferably a carboxy-substituted C1-C20 alkylamino group.
- the range of the carbon number is usually C1-C20, preferably C1-C18, more preferably C1-C14, and further preferably C1-C12.
- Specific examples include carboxymethylamino, carboxyethylamino, carboxypropylamino, carboxy-n-butylamino, carboxy-n-pentylamino, carboxy-n-hexylamino, carboxy-n-heptylamino, carboxy-n-octyl.
- Examples of the sulfo-substituted C1-C3 aliphatic amino group in the group A include those in which the aliphatic portion is linear or branched, and those that are linear are preferred. Specific examples include sulfomethylamino, sulfoethylamino, sulfopropylamino and the like, and sulfoethylamino is preferred.
- Examples of the substituted or unsubstituted 5- or 6-membered nitrogen-containing heterocyclic group in the group A include nitrogen-containing heterocyclic groups containing 0 or 1 oxygen atoms. Specific examples include pyrrolidinyl, piperidinyl, morpholinyl and the like, preferably piperidinyl or morpholinyl, more preferably morpholinyl. These may have a substituent, but are preferably unsubstituted.
- Examples of the substituted or unsubstituted aromatic amino group in the group A include a substituted or unsubstituted phenylamino group or naphthylamino group, and the former is preferable.
- the substituent for the aromatic amino group is not particularly limited, and includes 1 or 2 substituents selected from the group consisting of sulfo, carboxy, C1-C4 alkoxy, and hydroxy, and sulfo or carboxy is preferred.
- the number of substituents is preferably 1.
- phenylamino examples include unsubstituted phenylamino; sulfo-substituted ones such as 2-, 3-, or 4-sulfophenylamino; 2-, 3-, or 4-carboxyphenylamino, 3,5-biscarboxyphenylamino Carboxy-substituted ones such as 3- or 4-methoxyphenylamino; hydroxy-substituted ones such as 2-, 3-, or 4-hydroxyphenylamino; 3-carboxy-4-hydroxyphenylamino Carboxy and hydroxy substituted groups such as 2-carboxy-4-sulfophenylamino and the like.
- the substitution position of the substituent is not particularly limited, but when the group A is a substituted phenylamino group, the substitution position of the amino group is defined as the 1st position, preferably the 3rd or 4th position, and more preferably the 3rd position.
- the group A is a substituted naphthylamino group
- the amino group is preferably substituted at the 2-position, ie, a 2-aminonaphthyl group.
- the number of the substituent is preferably 2, and the substitution positions are preferably the 4th and 8th positions; or the 6th and 8th positions.
- Examples of the substituted or unsubstituted aryl C1-C4 alkylamino group in the group A include a substituted or unsubstituted phenyl C1-C4 alkylamino group, or a substituted or unsubstituted naphthyl C1-C4 alkylamino group. preferable.
- the type and number of substituents are not particularly limited, but sulfo or carboxy is preferable, and the number of substituents is 1 or 2, preferably 1.
- the substitution position of these substituents is not particularly limited, but is preferably substituted on aryl for sulfo and on alkyl for carboxy.
- unsubstituted ones such as benzylamino and phenethylamino
- sulfo-substitutions such as (4-sulfophenyl) methylamino, (4-sulfophenyl) ethylamino, (2,4-disulfophenyl) ethylamino
- Carboxy-substituted ones such as 1-carboxy- (2-phenyl) ethyl-1-amino; and the like.
- the group A includes a mono- or dicarboxy-substituted C1-C20 aliphatic amino group; a sulfo-substituted C1-C3 aliphatic amino group; an unsubstituted 5- or 6-membered nitrogen-containing heterocyclic group; a sulfo- or carboxy-substituted aromatic amino group; Or a sulfo- or carboxy-substituted phenyl C1-C4 alkylamino group; More preferred is a sulfo or carboxy-substituted aromatic amino group, and even more preferred is a carboxy-substituted aromatic amino group. Specific examples thereof are as described above.
- the substitution position of the sulfo group represented by — (SO 3 H) n is not particularly limited, but the substitution position of the azo group is 2-position, and when n is 1, the 6-position; n Is preferably substituted at positions 4 and 8, 5 and 7 or 6 and 8; when n is 3, it is preferably substituted at positions 4, 6 and 8. .
- the substitution position of the sulfo group represented by — (SO 3 H) m is not particularly limited, but when the substitution position of the azo group is 2-position and m is 1, the 2-position, 3- It is preferable to substitute at the position, or the 4-position, preferably the 4-position; when m is 2, the 2-position and the 4-position, or the 2-position and the 5-position;
- n, x, and group A represent the same meaning as in the above formula (1), and specific examples thereof, including preferred ones, in the above formula (1) Same as
- More preferable compounds in the above formulas (1) and (2) are compounds in which the group A is a group selected from the group consisting of amino groups represented by the above formulas (3) to (8).
- w represents an integer of 1 to 3, preferably 2.
- y represents an integer of 1 to 11, preferably an integer of 5 to 11.
- k represents an integer of 0 to 2, preferably 1, and z represents an integer of 1 to 3, preferably 1.
- the substitution position of the sulfo group is not particularly limited, but the substitution position of the alkylene group is the first position
- the 2-position and / or the 4-position is preferable, and the 4-position is more preferable.
- the substitution position of the sulfo group whose substitution position is not specified is not particularly limited, but the substitution position of the amino group is the 1st position and the 3rd position is preferred.
- the substitution position of the carboxy group whose substitution position is not specified is not particularly limited, but the substitution position of the amino group is the 1st position and the 3rd position is preferred.
- the group L represents phenyl or carboxymethyl, preferably phenyl.
- the compound represented by the above formula (1) exists as a free acid or a salt thereof.
- the salt of the compound represented by the above formula (1) include salts with inorganic or organic cations.
- Specific examples of the inorganic cation salt include alkali metal salts such as salts with lithium, sodium, potassium and the like.
- Specific examples of organic cation salts include, but are not limited to, quaternary ammonium salts represented by the following formula (9).
- Z 1 to Z 4 each independently represents a hydrogen atom, a C1-C4 alkyl group, a hydroxy C1-C4 alkyl group, or a hydroxy C1-C4 alkoxy C1-C4 alkyl group.
- examples of the alkyl group in Z 1 to Z 4 include methyl, ethyl and the like.
- examples of the hydroxyalkyl group include hydroxymethyl, hydroxyethyl, 3-hydroxypropyl, 2-hydroxypropyl, 4 -Hydroxybutyl, 3-hydroxybutyl, 2-hydroxybutyl and the like
- examples of hydroxyalkoxyalkyl groups include hydroxyethoxymethyl, 2-hydroxyethoxyethyl, 3- (hydroxyethoxy) propyl, 3- (hydroxy Ethoxy) butyl, 2- (hydroxyethoxy) butyl and the like.
- salts are sodium, potassium, lithium, monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine salts, ammonium salts, and the like. Of these, lithium, sodium, and ammonium salts are particularly preferred.
- the water-soluble azo compound represented by the above formula (1) of the present invention can be produced, for example, as follows.
- R, m, n, x, and group A which are appropriately used in the following formulas (AA) to (I) each have the same meaning as in the above formula (1).
- a compound represented by the following formula (AA) obtained with reference to an example described in JP-A-2004-75719 is converted into a methyl- ⁇ -sulfonic acid derivative (B) using sodium bisulfite and formalin. .
- aminonaphthalenesulfonic acids represented by the following formula (C) are diazotized by a conventional method, and the methyl- ⁇ -sulfonic acid derivative represented by the formula (B) obtained above and 0 to 15 ° C., pH 2
- the compound represented by the following formula (D) is obtained by performing a coupling reaction at ⁇ 4, followed by a hydrolysis reaction at 80 to 95 ° C. and pH 10.5 to 11.5.
- the amine corresponding to the group A represented by “AH” is preferably a chlorine atom in the obtained compound represented by the formula (I), preferably under conditions of 80 to 95 ° C. and pH 7 to 9.
- the water-soluble azo compound of the present invention represented by the above formula (1) can be obtained by substituting with a group.
- Specific examples of the compound represented by the formula (AA) include 2- (sulfoethoxy) aniline, 2- (sulfopropoxy) aniline, 2- (sulfobutoxy) aniline, and the like.
- Examples of the compounds represented include 2-aminonaphthalene-4,8-disulfonic acid, 2-aminonaphthalene-5,7-disulfonic acid, 2-aminonaphthalene-6,8-disulfonic acid, 2-aminonaphthalene-4, Specific examples include 6,8-trisulfonic acid and the like.
- Specific examples of the compound represented by the above formula (E) include aniline, 3-methylaniline, 2-methylaniline, 2-methoxyaniline, 3-methoxyaniline, and the like.
- Examples of the compounds represented include 4-aminobenzenesulfonic acid, 3-aminobenzenesulfonic acid, 2-aminobenzenesulfonic acid, 2-aminobenzene-1,4-disulfonic acid, 4-aminobenzene-1,3-disulfone.
- An acid etc. are mentioned as a specific example.
- the compound represented by the formula (AA) can be synthesized by a conventional method, and all the compounds represented by the formulas (C), (E), and (F) are commercially available. It can be obtained as a product.
- the salt of the compound represented by the above formula (1) can be easily obtained by the following method or the like.
- the reaction solution after completion of the reaction in the final step in the synthesis reaction of the compound represented by the above formula (1), or a wet cake containing the compound represented by the formula (1) or the formula (1) Sodium salt of the compound represented by the above formula (1) can be obtained as a wet cake by adding sodium chloride to an aqueous solution in which a dried product of the compound is dissolved, salting out, and filtering out the precipitated solid.
- an inorganic base such as potassium hydroxide, lithium hydroxide, aqueous ammonia, or the above formula (9)
- the corresponding potassium salt, lithium salt, ammonium salt, or quaternary ammonium salt can be obtained by adding an organic base such as a hydroxide of the compound to make it alkaline.
- the inorganic base examples include alkali metal hydroxides such as lithium hydroxide, sodium hydroxide, and potassium hydroxide, alkali metal carbonates such as lithium carbonate, sodium carbonate, and potassium carbonate, ammonium hydroxide ( Ammonia water) or the like is used.
- a salt of quaternary ammonium represented by the above formula (9) for example, a salt of alkanolamine such as diethanolamine and triethanolamine is used, but it is not limited thereto.
- the salt of the compound represented by the above formula (1) may change the physical properties such as solubility or the ink performance when used as an ink depending on the type of the salt. For this reason, it is also preferable to select the type of salt according to the intended ink performance.
- the water-soluble azo compound of the present invention is suitable for the production of natural and synthetic fiber materials or blended products, ink for writing, and particularly ink for ink jet recording.
- the reaction liquid containing the water-soluble azo compound of the present invention (for example, the reaction liquid after completion of the reaction in the final step) can also be used directly in the production of the ink composition of the present invention.
- the compound can be isolated from the reaction solution by, for example, crystallization, spray drying, or the like and then dried as necessary, and an ink composition can be prepared using the obtained compound.
- the ink composition of the present invention is usually 0.1 to 20% by mass, more preferably 1 to 10% by mass, and further preferably 2%, based on the total mass of the ink composition, using the water-soluble azo compound of the present invention as a coloring matter. Contains 8% by mass.
- the ink composition of the present invention is prepared by dissolving the compound represented by the formula (1) in an aqueous medium such as water or a mixed solvent of water and a water-soluble organic solvent (an organic solvent miscible with water). According to the above, an ink preparation agent is added.
- an ink composition having a low content of inorganic substances such as chloride (for example, sodium chloride) or sulfate (for example, sodium sulfate) of metal cation contained as impurities is used. Is preferred.
- the total content of sodium chloride and sodium sulfate is about 1% by mass or less in the total mass of the water-soluble azo compound of the present invention, and the lower limit is less than the detection limit of the analytical instrument, that is, 0% by mass. Good.
- a desalting treatment may be performed by a known method using a reverse osmosis membrane.
- the dried product or wet cake of the compound of the present invention or a salt thereof is suspended and purified by stirring in a mixed solvent of alcohol such as methanol and water, and the solid is separated by filtration and dried. Desalting treatment is possible.
- the ink composition of the present invention is prepared using water as a medium, and may contain a water-soluble organic solvent as needed within a range that does not impair the effects of the present invention.
- the water-soluble organic solvent may function as a dye solubilizer, a drying inhibitor (wetting agent), a viscosity modifier, a penetration accelerator, a surface tension modifier, an antifoaming agent, and the like, and the ink composition of the present invention. It is preferable to contain them.
- ink preparation agents include, for example, antiseptic / antifungal agents, pH adjusting agents, chelating reagents, rust preventing agents, UV absorbers, viscosity adjusting agents, dye dissolving agents, antifading agents, emulsion stabilizers, surface tension adjusting agents. And known additives such as antifoaming agents, dispersants, and dispersion stabilizers.
- the content of the water-soluble organic solvent is 0 to 60% by mass, preferably 10 to 50% by mass, based on the entire ink, and the ink preparation agent is 0 to 20% by mass, preferably 0 to 15%, based on the entire ink. It is good to use mass%. The remainder other than the above is water.
- water-soluble organic solvents examples include C1-C4 alkanols such as methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, and tert-butanol; N, N-dimethyl Amides such as formamide and N, N-dimethylacetamide; 2-pyrrolidone, N-methyl-2-pyrrolidone, 1,3-dimethylimidazolidin-2-one, 1,3-dimethylhexahydropyrimido-2-one Heterocyclic ketones such as: ketones such as acetone, methyl ethyl ketone, 2-methyl-2-hydroxypentan-4-one or keto alcohols; cyclic ethers such as tetrahydrofuran, dioxane; ethylene glycol, 1,2- or 1,3- Propylene glycol, 1,2- or 1,4-butylene Mono,
- water-soluble organic solvent Preferred as the above-mentioned water-soluble organic solvent are isopropanol, glycerin, mono, di, or triethylene glycol, dipropylene glycol, 2-pyrrolidone, N-methyl-2-pyrrolidone, and butyl carbitol, more preferably Isopropanol, glycerin, diethylene glycol, 2-pyrrolidone, N-methyl-2-pyrrolidone, and butyl carbitol.
- These water-soluble organic solvents are used alone or in combination.
- antiseptic / antifungal agents examples include organic sulfur, organic nitrogen sulfur, organic halogen, haloallylsulfone, iodopropargyl, N-haloalkylthio, benzothiazole, nitrile, pyridine, 8- Oxyquinoline, isothiazoline, dithiol, pyridine oxide, nitropropane, organotin, phenol, quaternary ammonium salt, triazine, thiadiazine, anilide, adamantane, dithiocarbamate, brominated indanone And benzyl bromacetate.
- Examples of the organic halogen compound include sodium pentachlorophenol
- examples of the pyridine oxide compound include sodium 2-pyridinethiol-1-oxide
- examples of the isothiazoline compound include 1,2-benzisothiazoline.
- Examples thereof include magnesium chloride, 5-chloro-2-methyl-4-isothiazolin-3-one calcium chloride, and 2-methyl-4-isothiazolin-3-one calcium chloride.
- antiseptic / antifungal agents include sodium acetate, sodium sorbate, sodium benzoate and the like.
- Other specific examples of antiseptic / antifungal agents include, for example, trade names Proxel GXL (S) and Proxel XL-2 (S) manufactured by Avecia.
- any substance can be used as long as it can control the pH of the ink in the range of 6.0 to 11.0 for the purpose of improving the storage stability of the ink.
- alkanolamines such as diethanolamine and triethanolamine
- hydroxides of alkali metals such as lithium hydroxide, sodium hydroxide, potassium hydroxide, ammonium hydroxide (ammonia water), or lithium carbonate, sodium carbonate, potassium carbonate, etc.
- alkali metal carbonates alkali metal carbonates.
- chelating reagent examples include disodium ethylenediaminetetraacetate, sodium nitrilotriacetate, sodium hydroxyethylethylenediaminetriacetate, sodium diethylenetriaminepentaacetate, sodium uracil diacetate, and the like.
- rust preventive examples include acid sulfite, sodium thiosulfate, ammonium thioglycolate, diisopropylammonium nitrite, pentaerythritol tetranitrate, dicyclohexylammonium nitrite and the like.
- the ultraviolet absorber examples include benzophenone compounds, benzotriazole compounds, cinnamic acid compounds, triazine compounds, and stilbene compounds. Further, a compound that absorbs ultraviolet rays typified by a benzoxazole-based compound and emits fluorescence, a so-called fluorescent brightener can also be used.
- viscosity modifier examples include water-soluble polymer compounds such as polyvinyl alcohol, cellulose derivatives, polyamines, and polyimines.
- dye solubilizer examples include urea, ⁇ -caprolactam, ethylene carbonate, and the like. It is preferred to use urea.
- the anti-fading agent is used for the purpose of improving image storage stability.
- various organic and metal complex antifading agents can be used.
- organic anti-fading agents include hydroquinones, alkoxyphenols, dialkoxyphenols, phenols, anilines, amines, indanes, chromans, alkoxyanilines, heterocycles, etc. Includes nickel complexes and zinc complexes.
- Examples of the surface tension adjusting agent include surfactants, and examples thereof include anionic surfactants, amphoteric surfactants, cationic surfactants, and nonionic surfactants.
- anionic surfactants include alkyl sulfocarboxylates, ⁇ -olefin sulfonates, polyoxyethylene alkyl ether acetates, N-acyl amino acids and salts thereof, N-acyl methyl taurate, alkyl sulfate polyoxyalkyl ethers Sulfate, alkyl sulfate polyoxyethylene alkyl ether phosphate, rosin acid soap, castor oil sulfate ester, lauryl alcohol sulfate ester, alkylphenol type phosphate ester, alkyl type phosphate ester, alkyl aryl sulfonate, diethyl sulfosuccinate Salt, diethyl hexyl sulphosuccinate, dioctyl sulphosuccinate and the like.
- Examples of the cationic surfactant include 2-vinylpyridine derivatives and poly-4-vinylpyridine derivatives.
- Amphoteric surfactants include lauryldimethylaminoacetic acid betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, coconut oil fatty acid amidopropyldimethylaminoacetic acid betaine, polyoctylpolyaminoethylglycine, imidazoline derivatives, etc. Is mentioned.
- Nonionic surfactants include ethers such as polyoxyethylene nonylphenyl ether, polyoxyethylene octylphenyl ether, polyoxyethylene dodecylphenyl ether, polyoxyethylene oleyl ether, polyoxyethylene lauryl ether, polyoxyethylene alkyl ether; Ester systems such as polyoxyethylene oleate, polyoxyethylene distearate, sorbitan laurate, sorbitan monostearate, sorbitan monooleate, sorbitan sesquioleate, polyoxyethylene monooleate, polyoxyethylene stearate; 2,4,7,9-tetramethyl-5-decyne-4,7-diol, 3,6-dimethyl-4-octyne-3,6-diol, 3,5-di Chill-1-hexyne-3-acetylene alcohol such as all, for example, as another embodiment, manufactured by Nissin Chemical Industry Co., Ltd. trade name Surfynol
- the antifoaming agent a highly oxidized oil type, a glycerin fatty acid ester type, a fluorine type, a silicone type compound or the like is used as necessary.
- the surface tension of the ink composition of the present invention is usually 25 to 70 mN / m, more preferably 25 to 60 mN / m. Further, the viscosity of the ink composition of the present invention is preferably 30 mPa ⁇ s or less, and more preferably adjusted to 20 mPa ⁇ s or less.
- the water to be used is preferably one having few impurities such as ion exchange water and distilled water.
- microfiltration may be performed using a membrane filter or the like to remove impurities.
- the pore diameter of the filter for performing microfiltration is usually 1 to 0.1 ⁇ m, preferably 0.8 to 0.1 ⁇ m.
- the ink composition containing the water-soluble azo compound of the present invention is suitable for use in printing, copying, marking, writing, drafting, stamping, or recording (printing), particularly inkjet recording.
- the ink composition of the present invention is less likely to cause solid precipitation even when dried in the vicinity of the nozzles of an inkjet printer, and for this reason, the printer head is also less likely to be blocked.
- a yellow print having high quality, extremely high print density and saturation, having good resistance to water, light, ozone, friction and the like is obtained. It is done.
- Some inkjet printers are loaded with two types of ink, a high-density ink and a low-density ink, in one printer for the purpose of supplying high-definition images.
- a high-concentration ink composition and a low-concentration ink composition may be prepared using the water-soluble azo compound of the present invention, and these may be used as an ink set. Moreover, you may use this compound only for either one. Moreover, you may use together the water-soluble azo compound of this invention, and a well-known yellow pigment
- the water-soluble azo compound of the present invention can be used for toning of other colors, such as black ink, or for mixing with a magenta dye or a cyan dye to prepare a red ink or a green ink.
- the colored product of the present invention is a substance colored with the water-soluble azo compound of the present invention or the ink composition containing the compound of the present invention.
- the material of the colored body is not particularly limited.
- a sheet for transmitting information such as paper or film, fiber or cloth (cellulose, nylon, wool, etc.), leather, a base material for a color filter, or the like may be used. Anything may be used, but the information transmission sheet is preferable, although not limited thereto.
- Examples of the coloring method include a printing method such as a dip dyeing method, a textile printing method, and screen printing, an ink jet recording method using an ink jet printer, and a method using ink jet recording is preferable.
- the information transmission sheet is preferably a surface-treated sheet, specifically, a sheet such as paper, synthetic paper, or film provided with an ink receiving layer.
- the ink receiving layer is formed by, for example, impregnating or coating the base material with a cationic polymer; inorganic fine particles capable of absorbing pigments in inks such as porous silica, alumina sol, and special ceramics are made hydrophilic with polyvinyl alcohol and polyvinylpyrrolidone.
- a method of coating the surface of the base material together with the conductive polymer; Those provided with such an ink receiving layer are usually called ink jet exclusive paper, ink jet exclusive film, glossy paper, gloss film and the like.
- the porous silica, alumina sol, special ceramics, etc. mentioned above are coated on the substrate surface because they are easily affected by gases having an oxidizing action in the air, that is, ozone gas and nitrogen oxide gas.
- This is a special inkjet paper.
- Examples of typical commercially available paper for inkjet use include Canon Inc., trade name Professional Photo Paper, Super Photo Paper, and Glossy Gold; Seiko Epson Corporation trade name Photo Paper Crispia (high gloss) ), Photo paper (gloss); manufactured by Hewlett-Packard Japan, trade name Advanced Photo Paper (gloss); manufactured by Fuji Film Co., Ltd. Since the ink composition of the present invention is excellent in the resistance to the gas having the above oxidizing action, it provides an excellent recorded image with little discoloration even when recording on such a recording material. It can also be used for plain paper.
- a container filled with the above ink composition may be loaded at a predetermined position of an ink jet printer and recorded on the recording material by a normal method.
- magenta ink, cyan ink, and, if necessary, green ink, blue (or violet) ink, red ink, black ink and the like can be used in combination with the ink composition of the present invention.
- the inks of the respective colors are injected into the respective containers, and these containers are used in a predetermined position of the ink jet printer.
- Some inkjet printers use, for example, a piezo method using mechanical vibration; a bubble jet (registered trademark) method using bubbles generated by heating; and the like.
- the ink jet recording method of the present invention can be used by any method.
- the ink composition of the present invention has a clear yellow color, has a particularly high image sharpness and particularly a print density recorded on dedicated inkjet paper or glossy paper, and has a hue suitable for an inkjet recording method. Also, the recorded image is characterized by various fastnesses such as light resistance, ozone resistance and moisture resistance, in particular, extremely high water resistance.
- the ink composition of the present invention does not precipitate or separate during storage, and has extremely high storage stability. Further, when the ink composition of the present invention is used for ink jet recording, solid precipitation due to drying of the ink composition in the vicinity of the nozzle is very unlikely to occur, and the ejector (ink head) is not blocked.
- the ink composition of the present invention uses a continuous ink jet printer and recirculates ink at a relatively long time interval; intermittently uses an on-demand ink jet printer; It does not cause changes in the physical properties.
- each synthesized compound is a measured value in an aqueous solution having a pH of 7 to 9.
- the water-soluble azo compounds of the present invention obtained in the examples are both sodium salts or ammonium salts, but for the sake of convenience, the chemical structural formulas are shown as free acids. However, as described above, free acids or alkali metal salts other than sodium salts and ammonium salts can be easily obtained by using an appropriate method, and the present invention is not limited to this example. Absent.
- Example 1 (Process 1) 17.3 parts of 4-aminobenzenesulfonic acid was dissolved in 200 parts of water while adjusting the pH to 6 with sodium hydroxide, and then 7.2 parts of sodium nitrite was added. This solution was added dropwise at 0 to 10 ° C. in 300 parts of 5% hydrochloric acid over 30 minutes, followed by stirring at 10 ° C. or lower for 1 hour to carry out diazotization reaction to prepare a diazo reaction liquid. On the other hand, 9.3 parts of aniline was dissolved in 130 parts of water while adjusting the pH to 5 with sodium hydroxide, and methylated by a conventional method using 10.4 parts of sodium bisulfite and 8.6 parts of 35% formalin.
- a - ⁇ -sulfonic acid derivative was used.
- the obtained methyl- ⁇ -sulfonic acid derivative was added to the previously prepared diazo reaction solution, and the mixture was stirred at 0 to 15 ° C. and pH 2 to 4 for 5 hours.
- the reaction solution was adjusted to pH 11 with sodium hydroxide, stirred at 80 to 95 ° C. for 5 hours while maintaining the same pH, further salted out by adding 100 parts of sodium chloride, and the precipitated solid was collected by filtration. Then, 100 parts of an azo compound represented by the following formula (10) was obtained as a wet cake.
- a methyl- ⁇ -sulfonic acid derivative was obtained by a conventional method.
- the obtained methyl- ⁇ -sulfonic acid derivative was added to the previously prepared diazo reaction solution, and the mixture was stirred at 0 to 15 ° C. and pH 2 to 4 for 5 hours.
- the reaction solution was adjusted to pH 11 with sodium hydroxide, stirred at 80 to 95 ° C. for 5 hours while maintaining the same pH, further salted out by adding 100 parts of sodium chloride, and the precipitated solid was collected by filtration. Then, 150 parts of an azo compound represented by the following formula (11) was obtained as a wet cake.
- Example 2 The present invention represented by the following formula (13) in the same manner as in Example 1 except that 18.8 parts of taurine used in (Step 3) of Example 1 was changed to 19.7 parts of 6-aminohexanoic acid. 30.0 parts of a sodium salt of a water-soluble azo compound ( ⁇ max: 386 nm) was obtained.
- Example 3 The present invention represented by the following formula (14) in the same manner as in Example 1 except that 18.8 parts of taurine used in (Step 3) of Example 1 was changed to 32.3 parts of 12-aminododecanoic acid. 28.0 parts of a sodium salt of a water-soluble azo compound ( ⁇ max: 393 nm) was obtained.
- Example 4 A compound represented by the following formula (15) was prepared in the same manner as in Example 1 except that 18.8 parts of taurine used in (Step 3) of Example 1 was changed to 34.6 parts of 3-aminobenzenesulfonic acid. 15.0 parts of the sodium salt of the water-soluble azo compound of the invention ( ⁇ max: 387 nm) were obtained.
- Example 5 The present invention represented by the following formula (16) by the same method as in Example 1 except that 18.8 parts of taurine used in (Step 3) of Example 1 was changed to 27.4 parts of 3-aminobenzoic acid. 12.0 parts of a sodium salt of a water-soluble azo compound ( ⁇ max: 390 nm) was obtained.
- Example 6 In the same manner as in Example 1 except that 18.8 parts of taurine used in (Step 3) of Example 1 was changed to 28.1 parts of 4- (aminomethyl) benzenesulfonic acid, it was represented by the following formula (17). 29.0 parts of a sodium salt of the water-soluble azo compound of the present invention ( ⁇ max: 390 nm) was obtained.
- Example 7 The water-soluble azo compound of the present invention represented by the following formula (18) was prepared in the same manner as in Example 1 except that 18.8 parts of taurine used in (Step 3) of Example 1 was changed to 29.4 parts of glutamic acid. 22.5 parts of a sodium salt of the compound ( ⁇ max: 395 nm) was obtained.
- Example 8 The water-soluble azo compound of the present invention represented by the following formula (19) was prepared in the same manner as in Example 1 except that 18.8 parts of taurine used in (Step 3) of Example 1 was changed to 9.5 parts of phenylalanine. 28.0 parts of a sodium salt of the compound ( ⁇ max: 394 nm) were obtained.
- Example 9 30.0 parts of the sodium salt of the water-soluble azo compound of the present invention represented by the above formula (13) obtained in Example 2 was dissolved in 270 parts of water, and 45 parts of ammonium chloride was added. The solution was adjusted to pH 1-6 with hydrochloric acid, stirred for 30 minutes, and the precipitated solid was collected by filtration to carry out a salt exchange reaction from a sodium salt to an ammonium salt to obtain 110 parts of a wet cake. The wet cake was washed with 200 parts of methanol, and then dried with a hot air dryer at 80 ° C., whereby an ammonium salt ( ⁇ max: 391 nm) of the water-soluble azo compound of the present invention represented by the above formula (13) 24. 0 parts were obtained.
- Example 10 12.0 parts of the sodium salt of the water-soluble azo compound of the present invention represented by the above formula (16) obtained in Example 5 was dissolved in 100 parts of water, and 25 parts of ammonium chloride was added. This solution was adjusted to pH 1 to 6 with hydrochloric acid, stirred for 30 minutes, and the precipitated solid was collected by filtration to carry out a salt exchange reaction from a sodium salt to an ammonium salt to obtain 40 parts of a wet cake. The wet cake was washed with 200 parts of methanol and then dried with a hot air dryer at 80 ° C., whereby the ammonium salt of the water-soluble azo compound of the present invention represented by the above formula (16) ( ⁇ max: 386 nm) 10. 0 parts were obtained.
- Example 11 22.5 parts of the sodium salt of the water-soluble azo compound of the present invention represented by the above formula (18) obtained in Example 7 was dissolved in 270 parts of water, and 45 parts of ammonium chloride was added. The solution was adjusted to pH 1 to 6 with hydrochloric acid, stirred for 30 minutes, and the precipitated solid was collected by filtration to carry out a salt exchange reaction from a sodium salt to an ammonium salt to obtain 80 parts of a wet cake. The wet cake was washed with 200 parts of methanol, and then dried with a hot air dryer at 80 ° C., whereby an ammonium salt ( ⁇ max: 393 nm) of the water-soluble azo compound of the present invention represented by the above formula (18) 20. 0 parts were obtained.
- Example 12 28.0 parts of the sodium salt of the water-soluble azo compound of the present invention represented by the above formula (19) obtained in Example 8 was dissolved in 270 parts of water, and 45 parts of ammonium chloride was added. The solution was adjusted to pH 1-6 with hydrochloric acid, stirred for 30 minutes, and the precipitated solid was collected by filtration to carry out a salt exchange reaction from a sodium salt to an ammonium salt to obtain 90 parts of a wet cake. The wet cake was washed with 200 parts of methanol and then dried with a hot air dryer at 80 ° C., whereby the ammonium salt of the water-soluble azo compound of the present invention represented by the above formula (19) ( ⁇ max: 389 nm) 24. 0 parts were obtained.
- Examples 13 to 21 [(A) Preparation of ink]
- the azo compound of the present invention obtained in each of the above examples was used as a dye and mixed at the composition ratio shown in Table 2 below to obtain an ink composition of the present invention, which was filtered through a 0.45 ⁇ m membrane filter.
- a test ink was prepared by removing impurities.
- the pH of the ink composition is adjusted to 7 to 9, when the dye is a sodium salt, it is adjusted using an aqueous sodium hydroxide solution, and when the dye is an ammonium salt, the pH is adjusted using aqueous ammonia. Adjustments were made.
- Comparative Example 1 For comparison, in the same manner as in Example 13, except that the compound represented by the following formula (20) synthesized by the method described in Example 1 of Patent Document 1 was used instead of the water-soluble azo compound of the present invention. Ink was prepared. This is referred to as Comparative Example 1. The evaluation test was performed using a sodium salt of a compound represented by the following formula (20).
- Comparative Example 2 For comparison, in the same manner as in Example 13, except that the compound represented by the following formula (21) synthesized by the method described in Example 1 of Patent Document 2 was used instead of the water-soluble azo compound of the present invention. Ink was prepared. This is referred to as Comparative Example 2. The evaluation test was conducted using a sodium salt of a compound represented by the following formula (21).
- Comparative Example 3 A comparative ink was prepared in the same manner as in Example 13 except that the compound represented by the following formula (22) synthesized by the method described in Patent Document 3 was used instead of the water-soluble azo compound of the present invention. did. This is referred to as Comparative Example 3. The evaluation test was performed using a sodium salt of a compound represented by the following formula (22).
- the reflection density was measured using a color measurement system (SpectroEye, manufactured by GretagMacbeth). Colorimetry was performed under the conditions of ANSI A as a density standard, a viewing angle of 2 °, and a light source D65. Various test methods for recorded images and evaluation methods for test results are described below.
- Comparative Examples 1 and 2 are excellent in light resistance, but (C) saturation and (D) print density are smaller values than others, and In the (F) ozone gas resistance test, the residual dye ratio after the test was less than 80%, and it was found that there were problems in (C) saturation, (D) printing density, and (F) ozone gas resistance. Moreover, although the comparative example 3 showed the result superior to the comparative examples 1 and 2 about (F) ozone gas resistance, (C) Saturation and (D) Print density are the smallest values in this test. Yes, and proved inadequate.
- each example showed the performance equal to or higher than each comparative example in (E) xenon light resistance and (F) ozone gas resistance test, and (C) each of the saturations was It tends to be larger than the comparative examples, and (D) the printing density is 1.91 or more, which is a very large value, and it is clear that the printing density is superior to the comparative examples.
- each example and each comparative example had the same water resistance, and both showed good results.
- the water resistance test (J) using plain paper it was revealed that each example has much better water resistance than Comparative Examples 1 and 2.
- the water-soluble azo compound of the present invention is suitable for preparing inks for inkjet recording, and is excellent in various fastness properties, that is, light resistance, ozone gas resistance, etc., and stored for a long time.
- the pigment is stable without causing precipitation or gelation, and has a high print density and saturation as yellow.
- the azo compound of the present invention is a very useful compound as various recording ink dyes, particularly as yellow dyes for inkjet inks.
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Abstract
Description
従来、万年筆、フェルトペン等のインク及びインクジェット記録用のインクとしては、水溶性の染料を水性媒体に溶解したインクが使用されている。また、これらのインクにおいては、ペン先やインク吐出ノズルでのインクの目詰まりを防止すべく、一般に水溶性の有機溶剤が添加されている。これらのインクには、十分な濃度の記録画像を与えること、ペン先やノズルの目詰まりを生じないこと、被記録材上での乾燥性が良いこと、滲みが少ないこと、保存安定性に優れること等が要求される。また、形成される記録画像には、耐水性、耐湿性、耐光性、耐ガス性等の各種堅牢度が求められている。
インクジェットプリンタのノズル詰まりは、ノズル付近でインク中の水分が他の溶剤や添加剤よりも先に蒸発し、水分が少なく溶剤や添加剤が多いという組成状態になったときに色素が固化し析出することに由来するものが多い。よって、インクを蒸発乾燥させた場合においても固体が析出しにくいということが非常に重要な要求性能の1つである。また、この理由により、溶剤や添加剤に対する高い溶解性も色素に求められる性質の1つである。
一方、上記の各種堅牢度のうち、耐水性や耐湿性は、被記録材の改良により、比較的に堅牢度を改善しやすい要求特性であるとされるが、反面、インクジェット用の黄色色素やイエローインクに対して要求される高い鮮明性を有し、且つ、耐水性、耐湿性等を十分に満足するものは未だ得られていない。
1)
下記式(1)で表される水溶性アゾ化合物又はその塩、
Rは水素原子、C1-C4アルキル基、又はC1-C4アルコキシ基を表し、
nは1から3の整数、mは1又は2、xは2から4の整数をそれぞれ表し、
基Aは、置換若しくは非置換のC1-C20脂肪族アミノ基;ヒドロキシ置換モノ若しくはジC1-C4脂肪族アミノ基;モノ若しくはジカルボキシ置換C1-C20脂肪族アミノ基;スルホ置換C1-C3脂肪族アミノ基;置換若しくは非置換の5若しくは6員含窒素複素環基;置換若しくは非置換の芳香族アミノ基;又は、置換若しくは非置換のアリールC1-C4アルキルアミノ基を表す。]
式(1)で表される水溶性アゾ化合物又はその塩が、下記式(2)で表される水溶性アゾ化合物又はその塩である上記1)に記載の水溶性アゾ化合物又はその塩、
基Aが、下記式(3)乃至(8)で表されるアミノ基よりなる群から選択される基である上記1)又は2)に記載の水溶性アゾ化合物又はその塩、
nが2、xが3、及び基Aが式(7)で表されるアミノ基である上記1)乃至3)のいずれか一項に記載の水溶性アゾ化合物又はその塩、
5)
上記1)乃至4)のいずれか一項に記載の水溶性アゾ化合物又はその塩を、色素として含有するインク組成物、
6)
水溶性有機溶剤をさらに含有する上記5)に記載のインク組成物、
7)
インクジェット記録用である、上記5)又は6)に記載のインク組成物、
8)
上記5)乃至7)のいずれか一項に記載のインク組成物をインクとして用い、該インクのインク滴を記録信号に応じて吐出させて被記録材に付着させることにより記録を行うインクジェット記録方法、
9)
上記被記録材が情報伝達用シートである上記8)に記載のインクジェット記録方法、
10)
上記情報伝達用シートが多孔性白色無機物を含有するインク受容層を有するシートである上記9)に記載のインクジェット記録方法、
11)
上記1)乃至4)のいずれか一項に記載の水溶性アゾ化合物若しくはその塩、又は上記5)乃至7)のいずれか一項に記載のインク組成物により着色された着色体、
12)
着色がインクジェットプリンタによりなされた上記11)に記載の着色体、
13)
上記5)乃至7)のいずれか一項に記載のインク組成物を含む容器が装填されたインクジェットプリンタ、
に関する。
上記式(1)で表される本発明の水溶性アゾ化合物は、各種の記録用、特にインクジェット記録用として有用な黄色色素であり、該色素を含有する本発明のインク組成物は、インクジェット記録用の黄色インクとして好適である。
RにおけるC1-C4アルコキシ基としては、直鎖又は分岐鎖のものが挙げられ、直鎖のものが好ましい。具体例としては、メトキシ、エトキシ、n-プロポキシ、n-ブトキシ等の直鎖のもの;イソプロポキシ、イソブトキシ、1-メチルプロポキシ、t-ブトキシ等の分岐鎖のもの等が挙げられる。
Rとしては、水素原子、メチル、又はメトキシが好ましく、水素原子がより好ましい。
Rの置換位置は特に制限されないが、トリアジン環に結合するアミノ基の置換位置を1位とした場合に、2位又は3位であり、メチルのときは3位、メトキシのときは2位が好ましい。
同様にnは1から3の整数であり、好ましくは2である。
同様にxは2から4の整数であり、好ましくは3である。
該置換基の置換位置は特に制限されないが、基Aが置換フェニルアミノ基の場合、アミノ基の置換位置を1位として、3又は4位が好ましく、3位がより好ましい。
基Aが置換ナフチルアミノ基の場合、アミノ基の置換位置は2位、すなわち2-アミノナフチル基が好ましい。また、該ナフチルアミノ基が置換基を有する場合、該置換基の数は2が好ましく、その置換位置は、4位及び8位;又は、6位及び8位;が好ましい。
上記式(3)においてwは1から3の整数を表し、好ましくは2である。
上記式(4)においてyは1から11の整数を表し、好ましくは5から11の整数である。
上記式(5)においてkは0から2の整数を表し、好ましくは1であり、zは1から3の整数を表し、好ましくは1である。式(5)におけるkが0以外の場合、すなわち、置換位置が特定されていないスルホ基を有する場合、該スルホ基の置換位置は特に制限されないが、アルキレン基の置換位置を1位とした場合に、2位及び/又は4位が好ましく、4位がより好ましい。
上記式(6)において、置換位置が特定されていないスルホ基の置換位置は特に制限されないが、アミノ基の置換位置を1位として、3位が好ましい。
上記式(7)において、置換位置が特定されていないカルボキシ基の置換位置は特に制限されないが、アミノ基の置換位置を1位として、3位が好ましい。
上記式(8)において基Lはフェニル又はカルボキシメチルを表し、好ましくはフェニルである。
特開2004-75719号公報に記載の例を参考にして得られる下記式(AA)で表される化合物を、重亜硫酸ナトリウム及びホルマリンを用いてメチル-ω-スルホン酸誘導体(B)に変換する。次いで、常法により、下記式(C)で表されるアミノナフタレンスルホン酸類をジアゾ化し、先に得られた式(B)で表されるメチル-ω-スルホン酸誘導体と0~15℃、pH2~4でカップリング反応を行い、引き続き、80~95℃、pH10.5~11.5で加水分解反応を行うことにより、下記式(D)で表される化合物を得る。
また、上記式(E)で表される化合物としては、アニリン、3-メチルアニリン、2-メチルアニリン、2-メトキシアニリン、3-メトキシアニリン等が具体例として挙げられ、上記式(F)で表される化合物としては、4-アミノベンゼンスルホン酸、3-アミノベンゼンスルホン酸、2-アミノベンゼンスルホン酸、2-アミノベンゼン-1,4-ジスルホン酸、4-アミノベンゼン-1,3-ジスルホン酸等が具体例として挙げられる。
これらの化合物のうち、例えば式(AA)で表される化合物は常法により合成が可能であり、また、式(C)、(E)、(F)で表される化合物は、いずれも市販品として入手することができる。
例えば、上記式(1)で表される化合物の合成反応における最終工程の、反応終了後の反応液、あるいは式(1)で表される化合物を含むウェットケーキ又は式(1)で表される化合物の乾燥品等を溶解した水溶液に食塩を加えて塩析し、析出固体を濾過分取することにより、上記式(1)で表される化合物のナトリウム塩をウェットケーキとして得ることができる。
また、得られたナトリウム塩のウェットケーキを水に溶解した後、塩酸等の酸を加えてそのpHを適宜調整し、析出した固体を濾過分取し、得られた固体を水又は塩酸水等の酸性水で洗浄すること等により、不純物として含有する無機塩、例えば塩化ナトリウムや硫酸ナトリウム等を除去することができ、上記式(1)で表される化合物の遊離酸を、あるいは式(1)で表される化合物の一部がナトリウム塩である遊離酸とナトリウム塩との混合物を得ることもできる。
さらに、式(1)で表される化合物の遊離酸のウェットケーキを水と共に撹拌しながら、例えば、水酸化カリウム、水酸化リチウム、アンモニア水等の無機塩基、又は上記式(9)で表される化合物の水酸化物等の有機塩基を添加してアルカリ性にすれば、各々相当するカリウム塩、リチウム塩、アンモニウム塩、又は4級アンモニウム塩を得ることもできる。遊離酸のモル数に対して、加える上記の塩のモル数を制限することにより、例えばリチウムとナトリウムとの混塩等、さらにはリチウム、ナトリウム、及びアンモニウムの混塩等も調製することが可能である。
無機塩基としては、上記の水酸化リチウム、水酸化ナトリウム、水酸化カリウム等のアルカリ金属の水酸化物の他に、炭酸リチウム、炭酸ナトリウム、炭酸カリウム等のアルカリ金属の炭酸塩、水酸化アンモニウム(アンモニア水)等が用いられる。
有機塩基としては、例えば上記式(9)で表される4級アンモニウムの塩、例えばジエタノールアミン、トリエタノールアミン等のアルカノールアミンの塩等が用いられるが、これらに限定されるものではない。
上記式(1)で表される化合物の塩は、その塩の種類により溶解性等の物理的な性質、あるいはインクとして用いた場合のインクの性能が変化する場合もある。このため、目的とするインク性能等に応じて塩の種類を選択することも好ましく行われる。
本発明の水溶性アゾ化合物を含む反応液(例えば上記最終工程の、反応終了後の反応液等)は、本発明のインク組成物の製造に直接使用することもできる。また、反応液から該化合物を例えば晶析、スプレー乾燥等の方法により単離した後、必要に応じて乾燥し、得られた該化合物を使用してインク組成物を調製することもできる。本発明のインク組成物は、本発明の水溶性アゾ化合物を色素として、該インク組成物の総質量中に通常0.1~20質量%、より好ましくは1~10質量%、さらに好ましくは2~8質量%含有する。
有機ハロゲン系化合物としては、例えばペンタクロロフェノールナトリウムが挙げられ、ピリジンオキシド系化合物としては、例えば2-ピリジンチオール-1-オキサイドナトリウムが挙げられ、イソチアゾリン系化合物としては、例えば1,2-ベンズイソチアゾリン-3-オン、2-n-オクチル-4-イソチアゾリン-3-オン、5-クロロ-2-メチル-4-イソチアゾリン-3-オン、5-クロロ-2-メチル-4-イソチアゾリン-3-オンマグネシウムクロライド、5-クロロ-2-メチル-4-イソチアゾリン-3-オンカルシウムクロライド、2-メチル-4-イソチアゾリン-3-オンカルシウムクロライド等が挙げられる。
その他の防腐防黴剤としては、酢酸ソーダ、ソルビン酸ソーダ、安息香酸ナトリウム等が挙げられる。その他、防腐防黴剤の具体例としては、例えば、アベシア社製 商品名プロクセルGXL(S)、プロクセルXL-2(S)等が好ましく挙げられる。
このようなインク受容層を設けたものは通常インクジェット専用紙、インクジェット専用フィルム、光沢紙、光沢フィルム等と呼ばれる。
これらの中でも空気中の酸化作用を持つガス、すなわちオゾンガスや酸化窒素ガス等に対して影響を受けやすいとされているのが、上記の多孔質シリカ、アルミナゾル、特殊セラミックス等を基材表面に塗工したインクジェット専用紙である。
インクジェット専用紙として代表的な市販品の一例を挙げると、キヤノン(株)製、商品名プロフェッショナルフォトペーパー、スーパーフォトペーパー、及び光沢ゴールド;セイコーエプソン(株)製、商品名写真用紙クリスピア(高光沢)、写真用紙(光沢);日本ヒューレット・パッカード(株)製、商品名アドバンスフォト用紙(光沢);富士フィルム(株)製、商品名画彩 写真仕上げPro;等がある。
本発明のインク組成物は上記の酸化作用を持つガスへの耐性が優れているため、このような被記録材への記録においても変退色の小さい優れた記録画像を与える。また、普通紙にも当然用いることができる。
インクジェットプリンタには、例えば機械的振動を利用したピエゾ方式;加熱により生ずる泡を利用したバブルジェット(登録商標)方式;等を利用したものがある。本発明のインクジェット記録方法は、いかなる方式であっても使用が可能である。
本発明のインク組成物は貯蔵中に沈澱、分離することがなく、保存安定性が極めて高い。また、本発明のインク組成物をインクジェット記録に使用した場合、ノズル付近におけるインク組成物の乾燥による固体析出は非常に起こりにくく、噴射器(インクヘッド)を閉塞することもない。本発明のインク組成物は連続式インクジェットプリンタを用い、比較的長い時間間隔においてインクを再循環させて使用する場合;オンデマンド式インクジェットプリンタにより断続的に使用する場合;等のいずれにおいても、物理的性質の変化を起こさない。
なお、合成した各化合物のλmax(最大吸収波長)は、pH7~9の水溶液中での測定値を示した。また、実施例で得た本発明の水溶性アゾ化合物はいずれもナトリウム塩又はアンモニウム塩であるが、便宜上、その化学構造式は遊離酸として示した。しかし、上述した通り、遊離酸あるいはナトリウム塩及びアンモニウム塩以外のアルカリ金属塩等をも適当な方法を用いることにより容易に得ることが可能であり、本発明は本実施例に限定されるものではない。
(工程1)
4-アミノベンゼンスルホン酸17.3部を水酸化ナトリウムでpH6に調整しながら水200部に溶解し、次いで亜硝酸ナトリウム7.2部を加えた。この溶液を0~10℃で、5%塩酸300部中に30分間かけて滴下した後、10℃以下で1時間撹拌し、ジアゾ化反応を行い、ジアゾ反応液を調製した。
一方、アニリン9.3部を、水酸化ナトリウムでpH5に調整しながら水130部に溶解し、10.4部の重亜硫酸ナトリウム及び8.6部の35%ホルマリンを用いて、常法によりメチル-ω-スルホン酸誘導体とした。
得られたメチル-ω-スルホン酸誘導体を、先に調製したジアゾ反応液中に加え、0~15℃、pH2~4で5時間撹拌した。反応液を水酸化ナトリウムでpH11とした後、同pHを維持しながら80~95℃で5時間撹拌し、さらに100部の塩化ナトリウムを加えて塩析し、析出固体を濾過分取することにより、下記式(10)で表されるアゾ化合物100部をウェットケーキとして得た。
2-アミノナフタレン-6,8-ジスルホン酸30.3部を水酸化ナトリウムでpH6に調整しながら水200部に溶解し、次いで亜硝酸ナトリウム7.2部を加えた。この溶液を0~10℃で、5%塩酸300部中に30分間かけて滴下した後、10℃以下で1時間撹拌し、ジアゾ化反応を行い、ジアゾ反応液を調製した。
一方、2-(スルホプロポキシ)アニリン23.1部を、水酸化ナトリウムでpH7に調整しながら水130部に溶解し、10.4部の重亜硫酸ナトリウム及び8.6部の35%ホルマリンを用いて、常法によりメチル-ω-スルホン酸誘導体とした。
得られたメチル-ω-スルホン酸誘導体を、先に調製したジアゾ反応液中に加え、0~15℃、pH2~4で5時間撹拌した。反応液を水酸化ナトリウムでpH11とした後、同pHを維持しながら80~95℃で5時間撹拌し、さらに100部の塩化ナトリウムを加えて塩析し、析出固体を濾過分取することにより、下記式(11)で表されるアゾ化合物150部をウェットケーキとして得た。
100部の氷水中にライオン社製、商品名:レオコールTD90(界面活性剤)0.10部を加えて激しく撹拌し、その中に塩化シアヌル9.2部を添加して0~5℃で30分間撹拌し、懸濁液を得た。
上記(工程1)で得た式(10)で表される化合物のウェットケーキ100部を水200部に溶解し、この溶液に上記の懸濁液を30分間かけて滴下した。滴下終了後、pH5~6、0~10℃で6時間撹拌し、反応液を得た。
一方、上記(工程2)で得た式(11)で表される化合物のウェットケーキ150部を水300部に溶解し、この溶液を上記の反応液に30分間かけて滴下した。滴下終了後pH6~7、25~35℃で6時間撹拌し、タウリン18.8部を加え、pH7~9、75~80℃で3時間撹拌した。得られた反応液を20~25℃まで冷却後、この反応液にアセトン800部を加え、20~25℃で1時間撹拌した。析出固体を濾過分取することによりウェットケーキ95.0部を得た。このウェットケーキを80℃の熱風乾燥機で乾燥することにより、下記式(12)で表される本発明の水溶性アゾ化合物のナトリウム塩(λmax:397nm)30.0部を得た。
実施例1の(工程3)で使用したタウリン18.8部を6-アミノヘキサン酸19.7部とする以外は実施例1と同様の方法により、下記式(13)で表される本発明の水溶性アゾ化合物のナトリウム塩(λmax:386nm)30.0部を得た。
実施例1の(工程3)で使用したタウリン18.8部を12-アミノドデカン酸32.3部とする以外は実施例1と同様の方法により、下記式(14)で表される本発明の水溶性アゾ化合物のナトリウム塩(λmax:393nm)28.0部を得た。
実施例1の(工程3)で使用したタウリン18.8部を3-アミノベンゼンスルホン酸34.6部とする以外は実施例1と同様の方法により、下記式(15)で表される本発明の水溶性アゾ化合物のナトリウム塩(λmax:387nm)15.0部を得た。
実施例1の(工程3)で使用したタウリン18.8部を3-アミノ安息香酸27.4部とする以外は実施例1と同様の方法により、下記式(16)で表される本発明の水溶性アゾ化合物のナトリウム塩(λmax:390nm)12.0部を得た。
実施例1の(工程3)で使用したタウリン18.8部を4-(アミノメチル)ベンゼンスルホン酸28.1部とする以外は実施例1と同様の方法により、下記式(17)で表される本発明の水溶性アゾ化合物のナトリウム塩(λmax:390nm)29.0部を得た。
実施例1の(工程3)で使用したタウリン18.8部をグルタミン酸29.4部とする以外は実施例1と同様の方法により、下記式(18)で表される本発明の水溶性アゾ化合物のナトリウム塩(λmax:395nm)22.5部を得た。
実施例1の(工程3)で使用したタウリン18.8部をフェニルアラニン9.5部とする以外は実施例1と同様の方法により、下記式(19)で表される本発明の水溶性アゾ化合物のナトリウム塩(λmax:394nm)28.0部を得た。
実施例2で得られた上記式(13)で表される本発明の水溶性アゾ化合物のナトリウム塩30.0部を水270部に溶解し、塩化アンモニウムを45部添加した。この溶液を、塩酸でpH1~6にし、30分撹拌した後に析出固体を濾過分取することにより、ナトリウム塩からアンモニウム塩への塩交換反応を行い、ウェットケーキ110部を得た。このウェットケーキをメタノール200部で洗浄した後、80℃の熱風乾燥機で乾燥することにより、上記式(13)で表される本発明の水溶性アゾ化合物のアンモニウム塩(λmax:391nm)24.0部を得た。
実施例5で得られた上記式(16)で表される本発明の水溶性アゾ化合物のナトリウム塩12.0部を水100部に溶解し、塩化アンモニウムを25部添加した。この溶液を、塩酸でpH1~6にし、30分撹拌した後に析出固体を濾過分取することにより、ナトリウム塩からアンモニウム塩への塩交換反応を行い、ウェットケーキ40部を得た。このウェットケーキをメタノール200部で洗浄した後、80℃の熱風乾燥機で乾燥することにより、上記式(16)で表される本発明の水溶性アゾ化合物のアンモニウム塩(λmax:386nm)10.0部を得た。
実施例7で得られた上記式(18)で表される本発明の水溶性アゾ化合物のナトリウム塩22.5部を水270部に溶解し、塩化アンモニウムを45部添加した。この溶液を、塩酸でpH1~6にし、30分撹拌した後に析出固体を濾過分取することにより、ナトリウム塩からアンモニウム塩への塩交換反応を行い、ウェットケーキ80部を得た。このウェットケーキをメタノール200部で洗浄した後、80℃の熱風乾燥機で乾燥することにより、上記式(18)で表される本発明の水溶性アゾ化合物のアンモニウム塩(λmax:393nm)20.0部を得た。
実施例8で得られた上記式(19)で表される本発明の水溶性アゾ化合物のナトリウム塩28.0部を水270部に溶解し、塩化アンモニウムを45部添加した。この溶液を、塩酸でpH1~6にし、30分撹拌した後に析出固体を濾過分取することにより、ナトリウム塩からアンモニウム塩への塩交換反応を行い、ウェットケーキ90部を得た。このウェットケーキをメタノール200部で洗浄した後、80℃の熱風乾燥機で乾燥することにより、上記式(19)で表される本発明の水溶性アゾ化合物のアンモニウム塩(λmax:389nm)24.0部を得た。
[(A)インクの調製]
上記の各実施例で得られた本発明のアゾ化合物を色素として用い、下記表2に示した組成比で混合して本発明のインク組成物を得、それぞれ0.45μmのメンブランフィルタで濾過して夾雑物を除くことにより、試験用のインクを調製した。この際、インク組成物のpHが7~9となるように、該色素がナトリウム塩のものは水酸化ナトリウム水溶液を用いて調整し、該色素がアンモニウム塩のものは、アンモニア水を用いてpHの調整を行なった。なお、インクの調製時に用いる水は全てイオン交換水を用い、総量が100部になるように水を加えた。実施例1の化合物を用いたインクの調製を実施例13、同様に、実施例2、4、5、6、7、9、10、及び12の化合物を用いたインクの調製を、それぞれ実施例14~21とする。
本発明の水溶性アゾ化合物のかわりに、特許文献1の実施例1に記載の方法にて合成した下記式(20)で表される化合物を用いる以外は実施例13と同様にして、比較用のインクを調製した。これを比較例1とする。なお、評価試験は下記式(20)で表される化合物のナトリウム塩を用いて行った。
本発明の水溶性アゾ化合物のかわりに、特許文献2の実施例1に記載の方法にて合成した下記式(21)で表される化合物を用いる以外は実施例13と同様にして、比較用のインクを調製した。これを比較例2とする。なお、評価試験は下記式(21)で表される化合物のナトリウム塩を用いて行った。
本発明の水溶性アゾ化合物のかわりに、特許文献3に記載の方法にて合成した下記式(22)で表される化合物を用いる以外は実施例13と同様にして、比較用のインクを調製した。これを比較例3とする。なお、評価試験は下記式(22)で表される化合物のナトリウム塩を用いて行った。
インクジェットプリンタ(キヤノン社製 商品名:PIXUS ip4100)を用いて、インクジェット専用紙(日本ヒューレット・パッカード社製 商品名:アドバンスフォト用紙(光沢))にインクジェット記録を行った。インクジェット記録の際、反射濃度が数段階の階調が得られるように画像パターンを作り、黄色の印字物を得た。得られた印字物を試験片とし、各種の試験を行った。
耐光性試験、及び耐オゾンガス性試験は試験前の印字物の反射濃度D値が1.0に最も近い部分について反射濃度の測定を行った。また、反射濃度は測色システム(SpectroEye、GretagMacbeth社製)を用いて測色した。測色は、濃度基準にANSI A、視野角2°、光源D65の条件で行った。
記録画像の各種試験方法及び試験結果の評価方法を以下に記載する。
光沢紙にプリントした画像のうち、最も反射濃度が高い部分について上記測色システムを用いて色度(a*、b*)の値を測色し、それより彩度C*を下記式より求めた。該彩度はより高い数値のものが高鮮明で良い。
C*=[(a*)2+(b*)2]1/2
結果を下記表3に示す。
光沢紙に記録した画像のうち、最も反射濃度が高い部分について上記測色システムを用いてイエロー濃度Dy値を測定した。該濃度Dy値は大きい数値のものが良い。
結果を下記表3に示す。
上記記載方法により得られた試験片をホルダーに設置して、キセノンウェザオメータXL75[スガ試験機(株)社製]を用い、温度24℃、湿度60%RH、0.36W/平方メートル照度で72時間照射した。
試験後、上記の測色システムを用いて反射濃度を測色した。測定後、反射濃度の残存率を(試験後の反射濃度/試験前の反射濃度)×100(%)で計算して求め、2段階で評価した。
色素残存率が85%以上・・・・・・・・○
色素残存率が85%未満・・・・・・・・×
結果を下記表3に示す。
上記のようにして得た試験片を、オゾンウェザーメーター(スガ試験機社製)を用いてオゾン濃度40ppm、湿度60%RH、温度24℃の環境下に16時間放置した後、反射濃度を前記の測色システムを用いて測色した。測定後、色素残存率を(試験後の反射濃度/試験前の反射濃度)×100(%)で計算して求め、2段階で評価した。
色素残存率が80%以上・・・・・・・・○
色素残存率が80%未満・・・・・・・・×
結果を下記表3に示す。
実施例13~21、及び比較例1~3で調製した各インクについて、密閉容器に保管して室温(18~28℃)で1ヶ月間の保存安定性を確認した。評価は目視で行い、以下の基準で評価した。
1ヶ月保存後に沈殿もゲル化も無い・・・・・・・・・・・○
1ヶ月保存後に沈殿が発生若しくはインクがゲル化・・・・×
結果を下記表3に示す。
光沢紙にプリントした試験片を恒温恒湿器IG400(ヤマト科学(株)社製)を用いて30℃、80%RHで5日間放置し、試験前後の印字部から未印字部への滲みを目視により判定した。評価基準は以下の通りである。
色素の未印字部への滲みがほとんど見られない・・○
色素の未印字部への滲みがやや見られる・・・・・△
色素の未印字部への滲みがかなり見られる・・・・×
結果を下記表4に示す。
光沢紙にプリントした試験片に、印刷後30分経過した後にイオン交換水を一滴、印刷面上に垂らした。そのまま一日乾燥させることで水滴を蒸発させ、試験前後の印字部から未印字への滲み具合を目視にて判定した。評価基準は以下の通りである。
比較例2と比較して未印字部への滲み具合が同程度である・・○
比較例2と比較して未印字部への滲み具合が悪い・・・・・・×
結果を下記表4に示す。
印刷する媒体を上記記載の光沢紙から普通紙とする以外は上記印刷方法と同じ方法で印刷した試験片に、印刷後30分経過した後にイオン交換水を一滴、印刷面上に垂らした。そのまま一日乾燥させることで水滴を蒸発させ、試験前後の印字部から未印字への滲み具合を目視にて判定した。評価基準は以下の通りである。
比較例2と比較して未印字部への滲み具合が良い・・・・・・◎
比較例2と比較して未印字部への滲み具合が同程度である・・○
比較例2と比較して未印字部への滲み具合が悪い・・・・・・×
結果を下記表4に示す。
また、比較例3は、(F)耐オゾンガス性については比較例1及び2よりも優れた結果を示したが、(C)彩度及び(D)印字濃度は本試験中で最も小さい値であり、不十分であることが判明した。
これに対して各実施例の印字物は、(E)キセノン耐光性及び(F)耐オゾンガス性試験において各比較例と同等かそれ以上の性能を示し、さらに(C)彩度はいずれも各比較例より大きい傾向にあり、また(D)印字濃度においても1.91以上と非常に大きい値であり、各比較例よりも優れていることが明らかとなった。また、光沢紙を用いた場合には、各実施例と各比較例との耐水性は同等であり、いずれも良好な結果を示した。これに対して、普通紙を用いた耐水性試験(J)では、各実施例は比較例1及び2よりもはるかに優れた耐水性を有していることが明らかとなった。
Claims (13)
- nが2、xが3、及び基Aが式(7)で表されるアミノ基である請求項1乃至3のいずれか一項に記載の水溶性アゾ化合物又はその塩。
- 請求項1乃至4のいずれか一項に記載の水溶性アゾ化合物又はその塩を、色素として含有するインク組成物。
- 水溶性有機溶剤をさらに含有する請求項5に記載のインク組成物。
- インクジェット記録用である請求項5又は6に記載のインク組成物。
- 請求項5乃至7のいずれか一項に記載のインク組成物をインクとして用い、該インクのインク滴を記録信号に応じて吐出させて被記録材に付着させることにより記録を行うインクジェット記録方法。
- 前記被記録材が情報伝達用シートである請求項8に記載のインクジェット記録方法。
- 前記情報伝達用シートが多孔性白色無機物を含有するインク受容層を有するシートである請求項9に記載のインクジェット記録方法。
- 請求項1乃至4のいずれか一項に記載の水溶性アゾ化合物若しくはその塩、又は請求項5乃至7のいずれか一項に記載のインク組成物により着色された着色体。
- 着色がインクジェットプリンタによりなされた請求項11に記載の着色体。
- 請求項5乃至7のいずれか一項に記載のインク組成物を含む容器が装填されたインクジェットプリンタ。
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JP2006152244A (ja) * | 2004-10-26 | 2006-06-15 | Nippon Kayaku Co Ltd | 水溶性アゾ化合物、インク組成物及び着色体 |
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US20090130399A1 (en) * | 2005-08-19 | 2009-05-21 | Shinjiro Takahashi | Water-Soluble Azo Compound, Ink Composition and Colored Article |
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JP2006152244A (ja) * | 2004-10-26 | 2006-06-15 | Nippon Kayaku Co Ltd | 水溶性アゾ化合物、インク組成物及び着色体 |
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