Source: http://www.google.com/patents/US7144105?ie=ISO-8859-1&dq=6,128,731
Timestamp: 2014-07-23 17:43:14
Document Index: 266093714

Matched Legal Cases: ['art 1010', 'art 1010', 'art 1006', 'art 1010', 'art 1010', 'art 1010', 'art 940', 'art 940']

Patent US7144105 - Ink, ink-jet recording process, recorded article, recording unit, ink ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsDisclosed herein is an ink including (i) first and second organic compounds which are incompatible with each other; (ii) at least one of a compound exhibiting fluorescence properties and a coloring material exhibiting fluorescence properties; and (iii) a liquid medium dissolving or dispersing the components...http://www.google.com/patents/US7144105?utm_source=gb-gplus-sharePatent US7144105 - Ink, ink-jet recording process, recorded article, recording unit, ink cartridge, ink-jet recording apparatus, fluorescence enhancing method and method of elongating life time of fluorescenceAdvanced Patent SearchPublication numberUS7144105 B2Publication typeGrantApplication numberUS 10/629,802Publication dateDec 5, 2006Filing dateJul 30, 2003Priority dateAug 8, 2000Fee statusPaidAlso published asCA2354788A1, CA2354788C, CN1347943A, CN100393824C, DE60135958D1, EP1180541A1, EP1180541B1, EP1862512A1, EP1862512B1, US6676734, US7220301, US20020047884, US20040074419, US20040183877Publication number10629802, 629802, US 7144105 B2, US 7144105B2, US-B2-7144105, US7144105 B2, US7144105B2InventorsAkira Nagashima, Shinichi HakamadaOriginal AssigneeCanon Kabushiki KaishaExport CitationBiBTeX, EndNote, RefManPatent Citations (74), Classifications (16), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetInk, ink-jet recording process, recorded article, recording unit, ink cartridge, ink-jet recording apparatus, fluorescence enhancing method and method of elongating life time of fluorescenceUS 7144105 B2Abstract Disclosed herein is an ink including
(i) first and second organic compounds which are incompatible with each other; (ii) at least one of a compound exhibiting fluorescence properties and a coloring material exhibiting fluorescence properties; and (iii) a liquid medium dissolving or dispersing the components (i) and (ii) therein. Images(16) Claims(8)
1. A recording unit comprising an ink container containing a fluorescent ink and a head portion for ejecting the ink, the ink comprising:
wherein the total content of the component (ii) in the ink is such that concentration quenching does not take place,
wherein the ink container has an ink holding member therein.
2. The recording unit according to claim 1, wherein the ink holding member is composed of fiber flocculate, and the fiber flocculate is aligned in an ink discharging direction of the ink container.
3. The recording unit according to claim 2, wherein the ink holding member has a contact surface with the ink container.
4. The recording unit according to claim 1, wherein the coloring material is C.I. Acid Red 52, and the content of the coloring material is at most 0.5% by weight based on the total weight of the ink.
5. An ink cartridge comprising an ink container containing ink, the ink comprising:
wherein the content of the component (ii) in the ink is such that concentration quenching does not take place,
6. The ink cartridge according to claim 5, wherein the ink holding member is composed of fiber flocculate, and the fiber flocculate is aligned in an ink discharging direction of the ink container.
7. The ink cartridge according to claim 6, wherein the ink holding member has a contact surface with the ink container.
8. The ink cartridge according to claim 5, wherein the coloring material is C.I. Acid Red 52, and the content of the coloring material is at most 0.5% by weight based on the total weight of the ink.
This application is a division of application Ser. No. 09/923,417, U.S. Pat. No. 6,676,734, filed Aug. 8, 2001.
Various investigations and reports have heretofore been made on inks for writing utensils and inks for ink-jet. In particular, in order to enhance the quality of recorded articles, including fluorescence intensity and coloring ability, such various proposals as described above have been made. For example, proposals of coloring materials and the like each having a novel structure, which are suitable for use in inks for the above-described use applications, proposals of inks using a coloring material (hereinafter referred to as �fluorescent coloring material�) exhibiting fluorescence properties as a main coloring material, and proposals as to the combined use of a fluorescent coloring material as a coloring material for inks have been made. In particular, the proposals as to inks, which pay attention to the fluorescence properties of fluorescent coloring materials, include Japanese Patent Application Laid-Open Nos. 8-151545, 9-132729, 10-193775, 10-298462 and 10-298467, and Japanese Patent No. 233038, and novel recording processes and fluorescent coloring materials have been proposed therein.
SUMMARY OF THE INVENTION With respect to the coloring ability of an ink on a recording medium, however, only chromaticity (L*,a*,b*) that is used as a measure of colors has heretofore been considered. Even when a fluorescent color material is used, design is also made according to the conventional measure under the circumstances. Therefore, it has been hard to say that the fluorescence properties of the coloring material are fully utilized. More specifically, even in the above-described various proposals making use of the fluorescent coloring materials, in the standpoint of the coloring ability of the coloring materials, the fluorescent coloring materials are used on the basis of only the viewpoint of (L*,a*,b*), not the viewpoint of the fluorescence properties, or attention is paid to the fluorescence properties of the coloring materials, but no attention is paid to the color developing properties of fluorescence, in other words, the interfacial properties of the fluorescence. Therefore, such proposals have not fully made the best use of the fluorescence properties of the coloring materials.
(i) first and second organic compounds which are incompatible with each other; (ii) at least one of a compound exhibiting fluorescence properties and a coloring material exhibiting fluorescence properties; and (iii) a liquid medium dissolving or dispersing the components (i) and (ii) therein. The ink may further have a compound having a vapor pressure of not lower than that of diechyleneglycol.
(i) first and second organic compounds which are incompatible with each other; (ii) at least one of a compound exhibiting fluorescence properties and a coloring material exhibiting fluorescence properties; and (iii) a liquid medium dissolving or dispersing the components (i) and (ii) therein is used as said ink. According to a yet still further embodiment of the present invention, there is provided a method of enhancing fluorescence of a fluorescent colored portion of a recorded article comprising a recording medium and the colored portion provided thereon, which comprises providing a reflecting interface for incident light on the colored portion from the outside between the outermost surface of the colored portion and the surface of the recording medium at the colored portion.
(i) first and second organic compounds which are incompatible with each other; (ii) a compound having a vapor pressure not lower than that of diethyleneglycol; (iii) at least one of a compound exhibiting fluorescence properties and a coloring material exhibiting fluorescence properties; and (iv) a liquid medium dissolving or dispersing the components (i), (ii) and (iii) therein is used as said ink. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal cross-sectional view of a head of an ink-jet recording apparatus.
FIG. 20 is a schematic cross-sectional view corresponding to a sectional form taken along line 20�20 in FIG. 19 and illustrating an ejecting operation of a liquid in the liquid-ejecting head with time together with FIGS. 21 to 27.
FIG. 21 is a schematic cross-sectional view corresponding to a sectional form taken along line 20�20 in FIG. 19 and illustrating an ejecting operation of the liquid in the liquid-ejecting head with time together with FIGS. 20 and 22 to 27.
FIG. 22 is a schematic cross-sectional view corresponding to a sectional form taken along line 20�20 in FIG. 19 and illustrating an ejecting operation of the liquid in the liquid-ejecting head with time together with FIGS. 20, 21 and 23 to 27.
FIG. 23 is a schematic cross-sectional view corresponding to a sectional form taken along line 20�20 in FIG. 19 in the liquid-ejecting head and illustrating an ejecting operation of the liquid in the liquid-ejecting head with time together with FIGS. 20 to 22 and 24 to 27.
FIG. 24 is a schematic cross-sectional view corresponding to a sectional form taken along line 20�20 in FIG. 19 and illustrating an ejecting operation of the liquid in the liquid-ejecting head with time together with FIGS. 20 to 23 and 25 to 27.
FIG. 25 is a schematic cross-sectional view corresponding to a sectional form taken along line 20�20 in FIG. 19 and illustrating an ejecting operation of the liquid in the liquid-ejecting head with time together with FIGS. 20 to 24, 26 and 27.
FIG. 26 is a schematic cross-sectional view corresponding to a sectional form taken along line 20�20 in FIG. 19 and illustrating an ejecting operation of the liquid in the liquid-ejecting head with time together with FIGS. 20 to 25 and 27.
FIG. 27 is a schematic cross-sectional view corresponding to a sectional form taken along line 20�20 in FIG. 19 and illustrating an ejecting operation of the liquid in the liquid-ejecting head with time together with FIGS. 20 to 26.
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will hereinafter be described in more detail by the preferred embodiments of the invention.
(i) first and second organic compounds which are incompatible with each other; (ii) at least one of a compound exhibiting fluorescence properties and a coloring material exhibiting fluorescence properties; and (iii) a liquid medium dissolving or dispersing the components (i) and (ii) therein. The mechanism that a recorded article good in stability and reliability and moreover good in coloring ability fully making good use of the fluorescence properties of the ink can be provided by the ink according to this embodiment will be first described.
In the ink according to this embodiment, as illustrated in FIG. 7, the individual components are present in a uniform state that they have been fully dissolved or dispersed in the liquid medium in the state of the ink. In FIG. 7, reference numeral 7000 designates an ink droplet before impacted on a recording medium 7009. In the ink droplet, reference numerals 7001 and 7003 indicate two organic compounds incompatible with each other, 7005 at least one (hereinafter referred to as �coloring material� merely) of a compound exhibiting fluorescence properties and a coloring material exhibiting fluorescence properties, and 7007 a liquid medium dissolving or dispersing the organic compounds 7001, 7003, and the coloring material 7005 therein. Reference numeral 7009 indicates a recording medium. When such an ink droplet 7000 is applied on the recording medium 7009 to conduct recording as illustrated in FIG. 8, a part (particularly, liquid medium 7007) of the ink components evaporates into the atmosphere or penetrates into the recording medium to diffuse, as illustrated in FIG. 9, whereby the constitution and compositional ratio of the ink on the recording medium are changed. As a result, the two organic compounds 7001 and 7003 incompatible with each other, which have been stably present in the state of the ink, undergo phase separation in a lamellar state on the recording medium to form an interface by the ink components between the ink and the atmosphere as illustrated in FIG. 10. Therefore, a state as if a recorded article has been laminated by the individuals of the ink components is created. FIG. 11 typically expresses the state shown in FIG. 10 for simplifying it. A layer indicated by the reference numeral 1101 in FIG. 11 contains the organic compound 7003 and the coloring material 7005, while a layer indicated by the reference numeral 1103 contains the organic compound 7001 and the coloring material 7005. The surface of the layer 1101 forms a gas-liquid interface 1105, and the layers 1101 and 1103 form a liquid-liquid interface 1107 between them. As a result, in the recorded article formed by the ink according to the present invention, the layer 1101 having a stable thickness is formed by the development of the liquid-liquid interface 1107. Therefore, the reflection of light can be effectively developed, and so coloring ability including fluorescence intensity is made good, thereby becoming an effective means for markedly enhancing the fluorescence properties and coloring ability of the recorded article.
Specifically, in three components of the two organic compounds incompatible with each other and water used as a solvent, the organic compounds are dissolved in water as the solvent. When water as the solvent is evaporated under an environment of, for example, 50� C., however, the two organic compounds are separated from each other. In particular, when the two organic compounds are those undergoing liquid-liquid separation as water as the solvent is evaporated, the mechanism according to this embodiment is easier to be developed.
One (first organic compound) of the two organic compound incompatible with each other preferably has a glycerol group. The glycerol group has strong hydrating force and is easy to serve as the compound on the water side of �water and oil� shown in the above-described specific example of the phenomenon of the present invention. Among such compounds, sugar alcohols as monomers, such as glycerol, xylitol and erythritol, and sugar alcohols as dimers and trimers, such as glycerol and diglycerol.
The water-soluble or hydrophilic compounds and coloring materials exhibiting fluorescence properties as referred to in the present invention include, for example, compounds and coloring materials (for example, dyes) soluble in water by themselves, and also compounds and coloring materials which are hydrophobic in themselves, but made hydrophilic by treating the surfaces thereof and seem to be dissolved in water by a method of emulsifying them in water, or the like. However, a technique that a coloring material is dispersed by using a resin as a dispersing agent, like pigment dispersion is not included. The reason for it is that this type of coloring material is hard to develop the effect by the above-described mechanism, and moreover it may not be said to be a very preferable selection from the viewpoint of reliability of the resulting ink. All the states of the compounds exhibiting fluorescence properties and fluorescent coloring materials in such a liquid medium as described above will hereinafter be represented as �dissolution� unless expressly noted.
Color under Fluorescent Structure daylight color Name of dye Brilliant-sulfoflavin FF(C.I. 56205) Yellow Green toyellowishgreen Basic YellowHG(C.I. 46040) Yellow Greenishyellow toyellow Eosine(C.I. 45380) Red Yellow toorange Rhodamine 6G(C.I. 45160) Red Yellow toorange Rhodamine B(C.I. 45170) Pink Orange tored Name of pigment Lumogen LYellow Lumogen LBrilliant Yellow Lumogen LYellow Orange Lumogen LRed Orange As the compounds exhibiting fluorescence properties, may be used, for example, fluorescent brightening agents commonly used.
As the liquid medium used in the inks according to this embodiment, water is preferably used as described above. More preferred is a mixture of water and a water-soluble organic solvent. Specific examples of the water-soluble organic solvent include amides such as dimethylformamide and dimethylacetamide; ketones such as acetone; ethers such as tetrahydrofuran and dioxane; polyalkylene glycols such as polyethylene glycol and polypropylene glycol; alkylene glycols the alkylene moiety of which has 2 to 6 carbon atoms, such as ethylene glycol, propylene glycol, butylene glycol, triethylene glycol, thiodiglycol, hexylene glycol and diethylene glycol; 1,2,6-hexanetriol; glycerol; lower alkyl ethers of polyhydric alcohols, such as ethylene glycol monomethyl (or monoethyl) ether, diethylene glycol monomethyl (or monoethyl) ether and triethylene glycol monomethyl (or monoethyl) ether; N-methyl-2-pyrrolidone; 1,3-dimethyl-2-imidazolidinone; triethanolamine; sulfolane; dimethyl sulfoxide; cyclic amide compounds such as 2-pyrrolidone and ∈-caprolactam; and imide compounds such as succinimide.
Pc(SO3H)t(SO2�NR1�L�NR2�X�NR3�G)q (A)
Ar1 and Ar2 are, independently of each other, an aryl group or substituted aryl group, at least one of Ar1 and Ar2 is a substituted aryl group having at least one substituent selected from COOH and COSH, R1 and R2 are, independently of each other, H, alkyl group (for example, a linear or branched alkyl group having 1 to 20 carbon atoms), substituted alkyl group (for example, an alkyl group at least one hydrogen of which has been substituted by halogen (fluorine, chlorine, bromine or the like), an alkoxy group having 1 to 3 carbon atoms, or the like), alkenyl group (for example, an alkenyl group having 1 to 20 carbon atoms), or substituted alkenyl group (for example, an alkenyl group at least one hydrogen of which has been substituted by halogen (fluorine, chlorine, bromine or the like), an alkoxy group having 1 to 3 carbon atoms, or the like), L is a divalent organic linking group (for example, �NH-φ-NH�, in which φ is a phenylene group), n is 0 or 1, and X is a carbonyl group or a group represented by the following formula (2), (3) or (4)
wherein R5 in the formula (2) is selected from hydrogen, alkyl groups (for example, linear or branched alkyl groups having 1 to 20 carbon atoms), substituted alkyl groups (for example, alkyl groups at least one hydrogen of which has been substituted by halogen (fluorine, chlorine, bromine or the like), an alkoxy group having 1 to 3 carbon atoms, or the like), alkoxy groups (for example, methoxy and ethoxy groups), halogen (for example, fluorine, chlorine and bromine), CN, ureide group and NHCOR6 (R6 being selected from hydrogen, alkyl groups (for example, linear or branched alkyl groups having 1 to 20 carbon atoms), substituted alkyl groups (for example, alkyl groups at least one hydrogen of which has been substituted by halogen (fluorine, chlorine, bromine or the like), an alkoxy group having 1 to 3 carbon atoms, or the like), aryl groups (for example, a phenyl group), substituted aryl groups (for example, a phenyl group substituted by at least one substituent selected from halogen (fluorine, chlorine, bromine and the like), alkoxy groups having 1 to 3 carbon atoms, linear or branched alkyl groups having 1 to 3 carbon atoms, and the like), aralkyl groups (for example, phenylmethyl and phenylethyl groups), and substituted aralkyl group (for example, aralkyl groups the aryl group of which has been substituted by at least one substituent selected from halogen (fluorine, chlorine, bromine and the like), linear or branched alkyl groups having 1 to 3 carbon atoms, alkoxy groups having 1 to 3 carbon atoms, and the like)), T in the formula (3) is an alkyl group, W is selected from hydrogen, CN CONR10R11, pyridinium group and carboxyl group, (R10 and R11 being, independently of each other, selected from hydrogen, alkyl groups (for example, linear or branched alkyl groups having 1 to 20 carbon atoms) and substituted alkyl groups (for example, alkyl groups at least one hydrogen of which has been substituted by halogen (fluorine, chlorine, bromine or the like), an alkoxy group having 1 to 3 carbon atoms, or the like)), m is an alkylene group having 2 to 3 carbon atoms, B in the formula (4) is selected from hydrogen, alkyl groups and carboxy group, R4, R5, R6 and R7 in the formula (C) are, independently of one another, selected from H, alkyl groups (for example, linear or branched alkyl groups having 1 to 20 carbon atoms) and substituted alkyl groups (for example, alkyl groups at least one hydrogen of which has been substituted by halogen (fluorine, chlorine, bromine or the like), an alkoxy group having 1 to 3 carbon atoms, or the like), L is a divalent organic linking group (for example, �NH-φ-NH�, in which φ is a phenylene group), n is 0 or 1, and X is a carbonyl group or a group represented by the following formula (5), (6) or (7)
Examples of the construction of a head, which is a main component of such an apparatus, are illustrated in FIGS. 1, 2 and 3. FIG. 1 is a cross-sectional view of a head 13 taken along the flow path of ink, and FIG. 2 is a cross-sectional view taken along line 2�2 in FIG. 1. The head 13 is formed by bonding a glass, ceramic, silicon or plastic plate or the like having a groove 14 through which an ink is passed, to a heating head 15 which is used for thermal recording (the drawings show a thin-film head to which, however, the invention is not limited). The heating head 15 is composed of a protective film 16 made of silicon oxide or the like, aluminum electrodes 17-1 and 17-2, a heating resistor layer 18 made of nichrome or the like, a heat accumulating layer 19, and a substrate 20 made of alumina or the like having a good heat radiating property.
When the motor 1018 is operated to rotate the belt 1016 in a direction shown by an arrow R in FIG. 13, the carriage member 1010 a of the recording part 1010 is moved by the prescribed movement in the direction shown by the arrow S in FIG. 13. When the motor 1018 is operated to rotate the belt 1016 in a direction reverse to the direction shown by the arrow R in FIG. 13, the carriage member 1010 a of the recording part 1010 is moved by the prescribed movement in a direction reverse to the direction shown by the arrow S in FIG. 13. At an end of the driving part 1006 for movement, a recovery unit 1026 for conducting an ejection-recovery operation for the recording part 1010 is provided in opposed relation to an array of ink-ejection openings of the recording part 1010 at the home position of the carriage member 1010 a. In the recording part 1010, ink-jet cartridges (hereinafter may be referred merely to as �cartridges� in some cases) 1012Y, 1012M, 1012C and 1012B for respective colors, for example, yellow, magenta, cyan and black, are detachably mounted on a carriage member 1010 a. FIG. 14 illustrates an exemplary ink-jet cartridge capable of being mounted on the above-described ink-jet recording apparatus. The cartridge 1012 in this embodiment is of a serial type, and its principal part is constructed by an ink-jet recording head 100 and a liquid tank 1001 for containing a liquid such as an ink.
In FIG. 15, reference numeral 934 indicates a substrate equipped with electrothermal conversion elements (hereinafter may be referred as �heater� in some cases) 931 and an ink feed opening 933 formed of a long-grooved through-opening as a common liquid chamber. The heaters 931, which are thermal energy-generating means, are arranged in a zigzag form in a row on both sides of the ink feed opening 933 along the longitudinal direction thereof with an interval of, for example, 300 dpi between the electrothermal conversion elements. Walls 936 for ink flow path for forming ink flow paths are provided on the substrate 934. Further, an ejection-opening plate 935 equipped with ejection openings 832 is provided on the walls 936 for ink flow path.
In the section of an ejection opening part 940 provided in the ejection-opening plate including ejection openings 832, the form of a section taken along a direction intersecting the ejecting direction (thickness-wise direction of the orifice plate 935) of the ink is a substantially star form as illustrated in FIG. 17 and is generally formed by 6 projected portions 832 a having a corner of an obtuse angle and 6 recessed portions 832 b alternately arranged between these projected portions 832 a and having a corner of an acute angle. More specifically, 6 grooves (with respect to the position of the groove portion, see 1141 a in FIG. 20) are formed in the thickness-wise direction (ejecting direction of the liquid) of the orifice plate shown in FIG. 15 by using the recessed portion 832 b locally distant from the center ∘ of the ejection opening as a top thereof and the projected portion 832 a adjacent to this region and locally near from the center ∘ of the ejection opening as a base.
Accordingly, the center ∘ of the ejection opening consists with the center of gravity G of a polygon formed by connecting centers (center (center of gravity) of a figure formed by connecting the top of the groove and 2 bases adjacent to the top) of the grooves adjacent to each other (see FIG. 17). The opening area of the ejection opening 832 in this embodiment is 400 μm2, and the opening area (area of the figure formed by connecting the top of the groove and 2 bases adjacent to the top) of the groove is about 33 μm2 per groove.
FIGS. 20 to 27 are cross-sectional views for illustrating the ejecting operation of a liquid by the liquid-ejecting head shown in FIGS. 15 to 19 and are cross-sectional views of the bubbling chamber 1337 shown in FIG. 19 taken along line 20�20. In this section, an end of the ejection opening part 940 in the thickness-wise direction of the orifice plate is the top 1141 a of a groove 1141.
In this embodiment, the ejection opening part in the liquid-ejecting head illustrated has a plurality of grooves 1141 in a dispersed state, whereby capillary force acts in an opposite direction Fc to the receding direction FM of the meniscus at the portion of the groove 1141 when the meniscus 1004 recedes. As a result, the forms of the meniscus and a main droplet (hereinafter may be referred to as �liquid� or �ink� in some cases) I when the meniscus recedes are compensated so as to give substantially symmetrical forms to the center of the ejection opening even if some variation is observed in the state of the bubble 101 by some cause.
EXAMPLES 1 to 8, and COMPARATIVE EXAMPLES 1 to 5:
Color under Fluorescent Structure daylight color Name of dye Brilliant-sulfoflavin FF(C.I. 56205) Yellow Green toyellowishgreen Basic YellowHG(C.I. 46040) Yellow Greenishyellow toyellow Eosine(C.I. 45380) Red Yellow toorange Rhodamine 6G(C.I. 45160) Red Yellow toorange Rhodamine B(C.I. 45170) Pink Orange tored Name of pigment Lumogen LYellow Lumogen LBrilliant Yellow Lumogen LYellow Orange Lumogen LRed Orange <Evaluation>
Table 2: Evaluation results of EXAMPLEs 1 to 8 and
COMPARATIVE EXAMPLEs 1 to 5 Example Comp. example 1 2 3 4 5 6 7 8 1 2 3 4 5 Ejection A A A A A A A A A A A A A stability Stability A A A A A A A A A A A A A Shelf A A A A A A A A B B B B B stability Coloring A A A A A A A A C C C C C ability Fluores- A A A A A A A A C C C C C cence 1 Fluores- A A A A A A A A C C C C C cence 2 (Ink According to Second Embodiment)
Thiethylene glycol
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