WO2016031438A1 - Pigment composition and inkjet water-based ink composition - Google Patents

Pigment composition and inkjet water-based ink composition Download PDF

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Publication number
WO2016031438A1
WO2016031438A1 PCT/JP2015/070830 JP2015070830W WO2016031438A1 WO 2016031438 A1 WO2016031438 A1 WO 2016031438A1 JP 2015070830 W JP2015070830 W JP 2015070830W WO 2016031438 A1 WO2016031438 A1 WO 2016031438A1
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Prior art keywords
pigment
water
composition
ink composition
based ink
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PCT/JP2015/070830
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French (fr)
Japanese (ja)
Inventor
義久 藤森
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株式会社Ｓｃｒｅｅｎホールディングス
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Publication of WO2016031438A1 publication Critical patent/WO2016031438A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • 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
    • C09D11/322—Pigment inks
    • 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
    • C09D17/00—Pigment pastes, e.g. for mixing in paints

Definitions

  • the present invention relates to a pigment composition and an aqueous inkjet ink composition, and more specifically, an edible pigment that is excellent in dispersibility and can be directly printed on a tablet such as a pharmaceutical or food by an inkjet method.
  • the present invention relates to a composition and an aqueous inkjet ink composition.
  • Tablets with a coated surface can be printed by a contact method such as gravure printing, so information with high discrimination is displayed on the one hand, but uncoated or OD (orally disintegrating) tablets with poor surface smoothness are in contact. Printing by the method is difficult. Therefore, for these tablets, a marking method that can display only simple characters has become the mainstream. As a result, in the pharmaceutical industry in particular, there is an increasing need for a new printing method capable of displaying highly discriminating information even for uncoated tablets, OD tablets and the like.
  • the present invention has been made in view of the above-mentioned problems, and an object thereof is an edible pigment that is excellent in dispersibility and can be directly printed by an ink jet method on tablets such as pharmaceuticals and foods.
  • the object is to provide a composition and an aqueous ink composition for inkjet.
  • the inventors of the present application have studied a pigment composition and an aqueous ink composition for inkjet in order to solve the above-mentioned problems. As a result, the inventors have found that the above problems can be solved by adopting the following configuration, and have completed the present invention.
  • the pigment composition according to the present invention includes a colored pigment made of iron oxide and decaglyceryl monooleate in order to solve the above-described problems.
  • a colored pigment made of iron oxide is used instead of a dye
  • an ink composition using a dye is used.
  • Light resistance can be improved as compared with products.
  • a pigment dispersant for colored pigments made of iron oxide decaglyceryl monooleate that complies with the standards of pharmaceutical additives, Japanese Pharmacopoeia or the Food Additives specified by the Pharmaceutical Affairs Law is used. While maintaining, it enables printing on tablets such as pharmaceuticals by an ink jet method.
  • the content ratio of the colored pigment of iron oxide and the decaglyceryl monooleate is preferably 1: 0.3 to 1: 1 on a mass basis.
  • the content ratio is 1: 0.3 or more, a decrease in dispersibility can be prevented.
  • the content ratio is 1: 1 or less, for example, when used in an aqueous inkjet ink composition, it is possible to prevent a decrease in ejection stability due to nozzle clogging.
  • the HLB of the decaglyceryl monooleate is preferably 10-14.
  • the HLB is less than 10, the affinity of the monooleic acid decaglyceryl for the dispersion medium is lowered, and it may be difficult to disperse the pigment.
  • the HLB is greater than 14, even if decaglyceryl monooleate is adsorbed on the pigment surface, it is easily desorbed and stability is lowered.
  • the average primary particle diameter of the colored pigment of iron oxide is preferably 30 nm to 800 nm.
  • the average primary particle diameter of the colored pigment of iron oxide 30 nm or more, it is possible to prevent the light resistance from being lowered, to prevent the coloring function from being lowered and becoming transparent, and to maintain high coloring power.
  • the average primary particle size 800 nm or less, coarse particles can be reduced, so that the colored pigment can be prevented from settling and nozzle clogging can be suppressed.
  • the average dispersed particle diameter D50 of the colored pigment of iron oxide dispersed is 25 nm to 300 nm.
  • the average dispersed particle diameter D50 is 25 nm to 300 nm.
  • the aqueous ink composition for inkjet according to the present invention is characterized by containing the pigment composition described above and having edible properties in order to solve the above-mentioned problems.
  • the aqueous ink composition for inkjet including the pigment composition is used for pharmaceuticals, foods, etc. It can be used as an ink material that is printed by an ink jet method on the tablet. Further, in the pigment composition, since a colored pigment made of iron oxide is used instead of a dye, for example, even if printing is performed on the surface of a tablet such as a pharmaceutical by an inkjet method, the printed image is excellent in light resistance, and The occurrence of bleeding can be prevented.
  • edible means that it consists only of the substance recognized as oral administration as a pharmaceutical or a pharmaceutical additive, and / or the substance recognized as a food or a food additive.
  • the tablet according to the present invention is a tablet printed on the surface by an inkjet recording method in which droplets of an aqueous inkjet ink are ejected and the droplets are attached to perform printing.
  • the water-based ink for ink-jet is composed of the water-based ink composition for ink-jet.
  • the inkjet aqueous ink since the aqueous inkjet ink composition containing iron oxide colored pigment and decaglyceryl monooleate is used as the inkjet aqueous ink, printing is directly performed by the inkjet recording method using the inkjet aqueous ink.
  • decaglyceryl monooleate that conforms to the standards of pharmaceutical additives, Japanese pharmacopoeia or official food additives specified by the Pharmaceutical Affairs Law and imparts good dispersibility to colored pigments of iron oxide Therefore, it is possible to provide a pigment composition and an aqueous ink composition for ink jet that enable printing by an ink jet method on tablets or the like of pharmaceuticals or foods. Further, an aqueous ink composition for ink jet using a colored pigment of iron oxide is superior in light resistance to that using a dye or the like, and can prevent bleeding of a printed image.
  • the pigment composition according to the present embodiment is a composition containing at least a colored pigment of iron oxide (hereinafter sometimes referred to as “pigment”) and decaglyceryl monooleate.
  • the colored pigment of iron oxide examples include yellow iron oxide, yellow iron sesquioxide, iron sesquioxide, bengara, black iron oxide, and the like. These pigments can be used alone or in admixture of two or more as required. However, when the pigment composition of the present embodiment is used for printing on the surface of tablets such as pharmaceuticals and supplements, the colored pigment of iron oxide is a pharmaceutical additive, Japanese pharmacopoeia or a food additive official standard specified by the Pharmaceutical Affairs Law. It is preferable to meet the above criteria.
  • the colored pigment means a pigment other than a white pigment that absorbs any light in the visible light wavelength region (380 to 780 nm).
  • the average primary particle size (volume average particle size) of the pigment is preferably 30 nm to 800 nm, more preferably 50 nm to 500 nm, and particularly preferably 75 nm to 400 nm.
  • the average primary particle diameter is an arithmetic average diameter obtained by observing the pigment with SEM (scanning electron microscope) or TEM (transmission electron microscope).
  • SEM scanning electron microscope
  • TEM transmission electron microscope
  • the pigment content directly affects the image density, and affects the storage stability, viscosity, pH and the like of the aqueous ink composition described below. Therefore, the content of the pigment may be appropriately set in consideration of these points.
  • the range of 2% by mass to 20% by mass is preferable with respect to the total mass of the pigment composition, and more preferably within the range of 5% by mass to 15% by mass.
  • the average dispersed particle diameter D50 of the pigment in the dispersed state is preferably in the range of 25 nm to 300 nm, more preferably in the range of 100 nm to 300 nm, still more preferably in the range of 75 nm to 250 nm, and in the range of 75 nm to 210 nm. Particularly preferred.
  • the dispersed particle diameter D99 of the pigment (99% in terms of cumulative particle size distribution in the volume cumulative particle size distribution) is preferably in the range of 100 nm to 900 nm, more preferably in the range of 100 nm to 600 nm, and in the range of 100 nm to 500 nm. The inside is particularly preferable.
  • the average dispersed particle diameters D50 and D99 of the pigment are values measured by a dynamic light scattering method using Microtrac UPA-EX150 (trade name, manufactured by Nikkiso Co., Ltd.).
  • the decaglyceryl monooleate has a function as a pigment dispersant. By adding decaglyceryl monooleate, the dispersibility of the colored pigment of iron oxide can be improved. In addition, decaglyceryl monooleate is compatible with the official food additive regulations. Therefore, decaglyceryl monooleate can be suitably used for printing on tablets or the like of pharmaceuticals or foods.
  • the HLB (hydrophilic / lipophilic ratio) of decaglyceryl monooleate is preferably 10 to 14, more preferably 10 to 13, and particularly preferably 11 to 12.
  • the HLB value is an HLB value according to the Griffin method and means a value obtained by the following equation.
  • HLB value 20 ⁇ (sum of formula weight of hydrophilic group / molecular weight)
  • the HLB value is a value in the range of 0 to 20. The larger the HLB value, the stronger the hydrophilicity, and the smaller the HLB value, the stronger the hydrophobicity.
  • the content ratio of the colored pigment of iron oxide and the decaglyceryl monooleate is preferably 1: 0.3 to 1: 1, more preferably 1: 0.3 to 1: 0.8 on a mass basis. It is more preferable that the ratio is 1: 0.4 to 1: 0.75.
  • the content ratio is 1: 0.3 or more, it is possible to prevent a decrease in dispersibility of the pigment.
  • the content ratio is 1: 1 or less, for example, when used in an aqueous inkjet ink composition, it is possible to prevent a decrease in ejection stability due to adhesion of the nozzle plate.
  • a dispersion medium for dispersing the pigment is included.
  • the dispersion medium include water, and more specifically, pure water such as ion-exchanged water, ultrafiltrated water, reverse osmosis water, and distilled water, or those obtained by removing ionic impurities such as ultrapure water.
  • water sterilized by ultraviolet irradiation or addition of hydrogen peroxide is preferable because generation of mold and bacteria can be prevented over a long period of time.
  • it is not specifically limited as content of a dispersion medium, It can set as needed suitably.
  • a mixed solution of water and a water-soluble organic solvent may be used.
  • the water-soluble organic solvent is not particularly limited, and specifically, for example, alcohols such as methyl alcohol, ethyl alcohol, n-butyl alcohol, isobutyl alcohol, tert-butyl alcohol, n-propyl alcohol, isopropyl alcohol; Amides such as dimethylformamide and dimethylacetamide; Ketones such as acetone and methyl ethyl ketone; Tetrahydrofuran, dioxane, ethylene glycol methyl ether, ethylene glycol ethyl ether, diethylene glycol methyl ether, diethylene glycol ethyl ether, triethylene glycol monomethyl ether, triethylene glycol mono Ethers such as ethyl ether; ethylene glycol, propylene glycol, butylene glycol , Diethylene glycol, triethylene glycol, 1,2,6-hexanetriol, thi
  • ethyl alcohol, n-butyl alcohol, isobutyl alcohol, n-propyl are those that fall under the standards of pharmaceutical additives, Japanese pharmacopoeia or food additives official regulations stipulated by the Pharmaceutical Affairs Law.
  • Alcohol, isopropyl alcohol, acetone, propylene glycol, polyethylene glycol and glycerin are preferred.
  • the blending amount when a water-soluble organic solvent is used as the dispersion medium is not particularly limited, and can be appropriately set as necessary.
  • the mixing method and the order of addition of the pigment, decaglyceryl monooleate, the dispersion medium, and other additives blended as necessary are not particularly limited.
  • a soot pigment, soot monodecoleate, water as a dispersion medium, and the like may be mixed at once, and the mixture may be subjected to a dispersion treatment using a normal disperser.
  • the dispersion time at this time is not particularly limited, but is preferably set so that the average dispersed particle diameter of the pigment falls within the above numerical range.
  • the dispersion time in the dispersion process is not particularly limited, and can be set as necessary.
  • the disperser used in the pigment dispersion treatment is not particularly limited as long as it is a commonly used disperser. Specific examples include a ball mill, a roll mill, a sand mill, a bead mill, a paint shaker, and a nanomizer.
  • the pigment composition of the present embodiment has a form of a pigment dispersion for preparing the water-based ink composition in addition to a form of a water-based ink composition for inkjet (details will be described later) as a final product. It is included.
  • aqueous ink composition for inkjet
  • the aqueous inkjet ink composition is an aqueous ink containing at least the pigment composition and having a main solvent of water.
  • the water-based ink composition of the present embodiment has edible properties and is suitably used for inkjet recording.
  • a pigment is used as a coloring material, the water-based ink composition is superior in terms of color developability, light resistance, water resistance and the like as compared with an ink composition using a dye.
  • the content of the pigment composition is preferably in the range of 1% by mass to 20% by mass, and more preferably in the range of 5% by mass to 10% by mass, in terms of pigment, with respect to the total mass of the aqueous ink composition.
  • the coloring power can be improved.
  • dispersibility can be improved by making the content of the pigment composition 20% by mass or less.
  • the water-based ink composition according to the present embodiment contains water (water as a main solvent).
  • water water as a main solvent.
  • water it is preferable to use water from which ionic impurities such as ion-exchanged water, ultrafiltered water, reverse osmosis water, distilled water, or ultrapure water have been removed.
  • ionic impurities such as ion-exchanged water, ultrafiltered water, reverse osmosis water, distilled water, or ultrapure water have been removed.
  • water sterilized by ultraviolet irradiation or addition of hydrogen peroxide is preferable because generation of mold and bacteria can be prevented over a long period of time.
  • it does not specifically limit as content of water, It can set suitably as needed.
  • additives may be blended.
  • it when used as an ink-jet ink for tablets such as pharmaceuticals, it is preferably one that complies with the standards of pharmaceutical additives, Japanese pharmacopoeia or official food additives specified by the Pharmaceutical Affairs Law.
  • the additive include water-soluble resins, organic amines, surfactants, pH adjusters, chelating agents, preservatives, viscosity adjusters, and antifoaming agents.
  • the content of these additives is not particularly limited, and can be appropriately set as necessary.
  • the water-based ink composition of the present embodiment can be produced by mixing the aforementioned components by an appropriate method. That is, for example, the additive is separately added to the dispersion of the pigment composition, and further diluted with water. Thereafter, the mixture is sufficiently stirred, and if necessary, filtration is performed to remove coarse particles and foreign matters that cause clogging. Thereby, the water-based ink composition which concerns on this Embodiment can be obtained.
  • each material is not particularly limited, and for example, the materials can be sequentially added to a container equipped with a stirring device such as a mechanical stirrer or a magnetic stirrer to perform stirring and mixing. Moreover, it does not specifically limit as a filtration method, For example, centrifugal filtration, filter filtration, etc. are employable.
  • the water-based ink composition of the present embodiment can be applied to ink and paint.
  • the aqueous ink composition of the present embodiment is excellent in dispersibility of the colored pigment of iron oxide, and thus can be suitably used for ink jet ink.
  • the water-based ink composition of the present embodiment uses a pharmaceutical additive, a pigment and a pigment dispersant that conform to the standards of the Japanese Pharmacopoeia or the Food Additives Standard defined by the Pharmaceutical Affairs Law, etc. It is edible and can be printed directly on the surface of tablets such as pharmaceuticals or supplements.
  • non-contact printing by an ink jet method is possible even for tablets with poor surface smoothness such as uncoated tablets and OD tablets.
  • the water-based ink composition is also excellent in light resistance, the occurrence of bleeding can be prevented even if it is directly printed on the surface of a tablet such as a pharmaceutical or a supplement.
  • the tablet according to the present embodiment is directly printed on the surface of the tablet by the inkjet recording method using the inkjet aqueous ink comprising the aqueous ink composition.
  • the water-based ink composition is excellent in light resistance and does not cause bleeding, various information for improving the user's identification property such as product information can be printed on the tablet. It is possible to prevent mistakes and accidental ingestion.
  • Tablets are solid at normal temperature, and for example, tablets produced by compressing and / or molding a tablet material containing an active ingredient into a certain shape are preferable.
  • the shape of the tablet is not particularly limited, and any shape can be adopted.
  • the tablet may be a pharmaceutical use tablet or a food use tablet. Examples of tablets for food use include health foods such as tablet confectionery and supplements.
  • the ink jet recording method for the tablet surface is not particularly limited.
  • the water-based ink composition can be discharged as droplets from a fine nozzle, and the droplets can be adhered to the tablet surface.
  • the discharge method is not particularly limited, and for example, a known method such as a continuous injection type (charge control type, spray type, etc.), an on-demand type (piezo type, thermal type, electrostatic suction type, etc.) can be employed. .
  • Examples 1 to 6 The pigment compositions of Examples 1 to 6 were prepared with the composition shown in Table 1 below. Moreover, the pigment composition of each Example was prepared by the following operation. That is, each material shown in Table 1 was put in a container, mixed, and dispersed with a disperser (Paint Shaker, manufactured by Asada Tekko Co., Ltd.) at room temperature for 4 hours (dispersion time). As a result, pigment compositions of Examples 1 to 6 were obtained.
  • the numerical values in Table 1 below are all expressed in parts by mass unless otherwise specified. Each material complies with the standards of pharmaceutical additives, Japanese pharmacopoeia or official food additives specified by the Pharmaceutical Affairs Law.
  • Comparative Examples 1 to 8 The pigment compositions of Comparative Examples 1 to 8 were prepared with the composition shown in Table 2 below. Moreover, the pigment composition of each comparative example was prepared by the following operation. That is, each material shown in Table 2 was put in a container, mixed, and dispersed with a disperser at room temperature for 4 hours (dispersion time). As a result, pigment compositions of Comparative Examples 1 to 8 were obtained.
  • the numerical values in Table 2 below are all expressed in parts by mass unless otherwise specified, as in Table 1. Each material complies with the standards of pharmaceutical additives, Japanese pharmacopoeia or official food additives specified by the Pharmaceutical Affairs Law. Further, since Eudragit RS30D, Eudragit RL30D, Eudragit L30D-55, and Eudragit NE30D in Table 2 are resins, there is no HLB value.

Abstract

　Provided are an edible pigment composition having excellent dispersibility and which can be directly printed by an inkjet method on a tablet or the like such as a food or drug, and an inkjet water-based ink composition. The pigment composition pertaining to the present invention is characterized by including decaglyceryl monooleate and a colored pigment comprising iron oxide. The inkjet water-based ink composition pertaining to the present invention is characterized by including the aforementioned pigment composition, and by being edible.

Description

顔料組成物及びインクジェット用水性インク組成物Pigment composition and water-based ink composition for inkjet
　本発明は顔料組成物及びインクジェット用水性インク組成物に関し、より詳細には、分散性に優れ、医薬品や食品等の錠剤等に対して、インクジェット方式で直接印刷することが可能な可食性の顔料組成物及びインクジェット用水性インク組成物に関する。 The present invention relates to a pigment composition and an aqueous inkjet ink composition, and more specifically, an edible pigment that is excellent in dispersibility and can be directly printed on a tablet such as a pharmaceutical or food by an inkjet method. The present invention relates to a composition and an aqueous inkjet ink composition.
　錠剤の医薬品やサプリメント等の食品に対しては、パッケージだけでなく錠剤本体にも製品情報を表示することによって、それらの識別性を向上させ、調剤ミスや誤飲防止などが図られている。表面がコーティングされた錠剤は、グラビア印刷などの接触方式で印刷できるため、識別性の高い情報表示が行われている半面、表面の平滑性が悪い素錠やＯＤ（口腔内崩壊）錠では接触方式による印刷が困難となっている。そのため、これらの錠剤に対しては、簡単な文字しか表示できない刻印方式が主流となっている。その結果、特に製薬業界では、素錠やＯＤ錠等に対しても識別性の高い情報表示が可能な、新たな印刷方法に対するニーズが高まっている。 For foods such as tablet medicines and supplements, product information is displayed not only on the package but also on the tablet body, thereby improving their discrimination and preventing dispensing errors and accidental ingestion. Tablets with a coated surface can be printed by a contact method such as gravure printing, so information with high discrimination is displayed on the one hand, but uncoated or OD (orally disintegrating) tablets with poor surface smoothness are in contact. Printing by the method is difficult. Therefore, for these tablets, a marking method that can display only simple characters has become the mainstream. As a result, in the pharmaceutical industry in particular, there is an increasing need for a new printing method capable of displaying highly discriminating information even for uncoated tablets, OD tablets and the like.
　そのような印刷方法としては、例えば、染料を用いた水性インク組成物によるインクジェット方式の印刷が挙げられる（下記特許文献１参照）。しかしながら、前記水性インク組成物を用いて医薬品の錠剤等に印刷すると、印刷画像が滲み耐光性に劣るという問題がある。このような問題を解決する方法の一つとして、染料等に代えて顔料を用い、これにより、耐光性を向上させて、滲みの問題を解消することが考えられる。 As such a printing method, for example, inkjet printing using a water-based ink composition using a dye can be cited (see Patent Document 1 below). However, when printing on a pharmaceutical tablet or the like using the aqueous ink composition, there is a problem that a printed image is blurred and inferior in light resistance. As one method for solving such a problem, it is conceivable to use a pigment instead of a dye or the like, thereby improving the light resistance and eliminating the bleeding problem.
　ここで、水性インク組成物に顔料を用いるためには、良好な分散安定性の確保及び顔料の沈降を防ぐために高度な分散性が要求される。そのため、顔料を用いた水性インク組成物においては、顔料分散剤を配合する必要がある。しかしながら、医薬品添加物として使用可能な化合物は薬事法により制限されているため、良好な顔料分散性を示し、かつ、当該薬事法で定める医薬品添加物、日本薬局方又は食品添加物公定書の基準に適合した水性インク組成物が開発されていないのが現状である。 Here, in order to use a pigment in the water-based ink composition, a high degree of dispersibility is required in order to ensure good dispersion stability and prevent pigment settling. Therefore, in a water-based ink composition using a pigment, it is necessary to blend a pigment dispersant. However, since compounds that can be used as pharmaceutical additives are limited by the Pharmaceutical Affairs Law, they exhibit good pigment dispersibility, and are based on the standards of pharmaceutical additives, the Japanese Pharmacopoeia or the Food Additives Standard specified by the Pharmaceutical Affairs Law. At present, no water-based ink composition suitable for the above has been developed.
特開２０１１－２３６２７９号公報JP 2011-236279 A
　本発明は前記問題点に鑑みなされたものであり、その目的は、分散性に優れ、かつ、医薬品や食品等の錠剤等に対して、インクジェット方式で直接印刷することが可能な可食性の顔料組成物及びインクジェット用水性インク組成物を提供することにある。 The present invention has been made in view of the above-mentioned problems, and an object thereof is an edible pigment that is excellent in dispersibility and can be directly printed by an ink jet method on tablets such as pharmaceuticals and foods. The object is to provide a composition and an aqueous ink composition for inkjet.
　本願発明者等は、前記問題点を解決すべく、顔料組成物及びインクジェット用水性インク組成物について検討した。その結果、下記構成を採用することにより前記の問題点を解決できることを見出して、本発明を完成させるに至った。 The inventors of the present application have studied a pigment composition and an aqueous ink composition for inkjet in order to solve the above-mentioned problems. As a result, the inventors have found that the above problems can be solved by adopting the following configuration, and have completed the present invention.
　即ち、本発明に係る顔料組成物は、前記の課題を解決する為に、酸化鉄からなる有色顔料と、モノオレイン酸デカグリセリルとを含むことを特徴とする。 That is, the pigment composition according to the present invention includes a colored pigment made of iron oxide and decaglyceryl monooleate in order to solve the above-described problems.
　前記の構成によれば、染料の代わりに酸化鉄からなる有色顔料を用いるので、本発明の顔料組成物を、例えば、インクジェット用水性インク組成物に用いた場合には、染料を用いたインク組成物と比較して、耐光性の向上が図れる。また、酸化鉄からなる有色顔料の顔料分散剤として、薬事法で定める医薬品添加物、日本薬局方又は食品添加物公定書の基準に適合したモノオレイン酸デカグリセリルを用いるので、良好な分散性を維持しつつ、医薬品等の錠剤に対するインクジェット方式での印刷を可能にする。また、上述の通り、耐光性にも優れているので、印刷画像の滲みの発生も防止することができる。 According to the above configuration, since a colored pigment made of iron oxide is used instead of a dye, when the pigment composition of the present invention is used in, for example, an aqueous inkjet ink composition, an ink composition using a dye is used. Light resistance can be improved as compared with products. In addition, as a pigment dispersant for colored pigments made of iron oxide, decaglyceryl monooleate that complies with the standards of pharmaceutical additives, Japanese Pharmacopoeia or the Food Additives specified by the Pharmaceutical Affairs Law is used. While maintaining, it enables printing on tablets such as pharmaceuticals by an ink jet method. Moreover, since it is excellent also in light resistance as above-mentioned, generation | occurrence | production of the blur of a printed image can also be prevented.
　前記の構成に於いては、前記酸化鉄の有色顔料と前記モノオレイン酸デカグリセリルとの含有比が、質量基準で１：０．３～１：１であることが好ましい。前記含有比が１：０．３以上であると、分散性の低下を防止することができる。その一方、前記含有比が１：１以下であると、例えば、インクジェット用水性インク組成物に用いた場合に、ノズルの目詰まりに起因する吐出安定性の低下を防止することができる。 In the above configuration, the content ratio of the colored pigment of iron oxide and the decaglyceryl monooleate is preferably 1: 0.3 to 1: 1 on a mass basis. When the content ratio is 1: 0.3 or more, a decrease in dispersibility can be prevented. On the other hand, when the content ratio is 1: 1 or less, for example, when used in an aqueous inkjet ink composition, it is possible to prevent a decrease in ejection stability due to nozzle clogging.
　また、前記の構成に於いては、前記モノオレイン酸デカグリセリルのＨＬＢが１０～１４であることが好ましい。前記ＨＬＢが１０未満であると、モノオレイン酸デカグリセリルの分散媒に対する親和性が低下し、顔料の分散が困難になる場合がある。その一方、前記ＨＬＢが１４より大きいと、モノオレイン酸デカグリセリルが顔料表面に吸着しても脱着し易くなり、安定性が低下する。 Further, in the above configuration, the HLB of the decaglyceryl monooleate is preferably 10-14. When the HLB is less than 10, the affinity of the monooleic acid decaglyceryl for the dispersion medium is lowered, and it may be difficult to disperse the pigment. On the other hand, if the HLB is greater than 14, even if decaglyceryl monooleate is adsorbed on the pigment surface, it is easily desorbed and stability is lowered.
　前記の構成に於いては、前記酸化鉄の有色顔料の平均一次粒子径が３０ｎｍ～８００ｎｍであることが好ましい。酸化鉄の有色顔料の平均一次粒子径を３０ｎｍ以上にすることにより、耐光性の低下を防止すると共に、着色機能が低下して透明となるのを防止し、高い着色力の維持が図れる。その一方、前記平均一次粒子径を８００ｎｍ以下にすることにより、粗粒の低減が図れるので、前記有色顔料の沈降を防止し、ノズルの目詰まりの抑制が可能になる。 In the above structure, the average primary particle diameter of the colored pigment of iron oxide is preferably 30 nm to 800 nm. By making the average primary particle diameter of the colored pigment of iron oxide 30 nm or more, it is possible to prevent the light resistance from being lowered, to prevent the coloring function from being lowered and becoming transparent, and to maintain high coloring power. On the other hand, by setting the average primary particle size to 800 nm or less, coarse particles can be reduced, so that the colored pigment can be prevented from settling and nozzle clogging can be suppressed.
　前記の構成に於いては、分散している前記酸化鉄の有色顔料の平均分散粒子径Ｄ５０が２５ｎｍ～３００ｎｍであることが好ましい。前記平均分散粒子径Ｄ５０を２５ｎｍ以上にすることにより、耐光性及び分散性の向上が図れる。その一方、前記平均分散粒子径Ｄ５０を３００ｎｍ以下にすることにより、有色顔料の沈降を防止することができる。 In the above configuration, it is preferable that the average dispersed particle diameter D50 of the colored pigment of iron oxide dispersed is 25 nm to 300 nm. By setting the average dispersed particle diameter D50 to 25 nm or more, light resistance and dispersibility can be improved. On the other hand, by setting the average dispersed particle diameter D50 to 300 nm or less, precipitation of colored pigments can be prevented.
　本発明に係るインクジェット用水性インク組成物は、前記の課題を解決する為に、前記に記載の顔料組成物を含み、かつ、可食性を有するものであることを特徴とする。 The aqueous ink composition for inkjet according to the present invention is characterized by containing the pigment composition described above and having edible properties in order to solve the above-mentioned problems.
　前記顔料組成物においては、食品添加物公定書等に適合したモノオレイン酸デカグリセリルが顔料分散剤として使用されているので、当該顔料組成物を含むインクジェット用水性インク組成物は、医薬品又は食品等の錠剤に対し、インクジェット方式で印刷するインク材料に用いることができる。また、前記顔料組成物においては、染料の代わりに酸化鉄からなる有色顔料を用いているので、例えば、医薬品等の錠剤表面にインクジェット方式で印刷しても、印刷画像は耐光性に優れ、かつ、その滲みの発生も防止することができる。尚、可食性とは、医薬品若しくは医薬品添加物として経口投与が認められている物質、及び／又は食品若しくは食品添加物として認められている物質のみからなることを意味する。 In the pigment composition, since decaglyceryl monooleate that conforms to the official standard for food additives and the like is used as the pigment dispersant, the aqueous ink composition for inkjet including the pigment composition is used for pharmaceuticals, foods, etc. It can be used as an ink material that is printed by an ink jet method on the tablet. Further, in the pigment composition, since a colored pigment made of iron oxide is used instead of a dye, for example, even if printing is performed on the surface of a tablet such as a pharmaceutical by an inkjet method, the printed image is excellent in light resistance, and The occurrence of bleeding can be prevented. In addition, edible means that it consists only of the substance recognized as oral administration as a pharmaceutical or a pharmaceutical additive, and / or the substance recognized as a food or a food additive.
　本発明に係る錠剤は、前記の課題を解決する為に、インクジェット用水性インクの液滴を吐出し、当該液滴を付着させて印刷を行うインクジェット記録方法により、表面に印刷された錠剤であって、前記インクジェット用水性インクが、前記のインクジェット用水性インク組成物からなることを特徴とする。 In order to solve the above-described problems, the tablet according to the present invention is a tablet printed on the surface by an inkjet recording method in which droplets of an aqueous inkjet ink are ejected and the droplets are attached to perform printing. The water-based ink for ink-jet is composed of the water-based ink composition for ink-jet.
　前記の構成によれば、インクジェット用水性インクとして、酸化鉄の有色顔料とモノオレイン酸デカグリセリルを含むインクジェット用水性インク組成物を用いるので、当該インクジェット用水性インクでインクジェット記録方法により直接印刷しても、耐光性に優れ、かつ、滲みの発生を防止した印刷画像を実現することができる。これにより、錠剤本体にも製品情報を表示することが可能になり、識別性を向上させ、調剤ミスや誤飲防止を図ることが可能な錠剤を提供することができる。 According to the above configuration, since the aqueous inkjet ink composition containing iron oxide colored pigment and decaglyceryl monooleate is used as the inkjet aqueous ink, printing is directly performed by the inkjet recording method using the inkjet aqueous ink. However, it is possible to realize a printed image that has excellent light resistance and prevents occurrence of bleeding. Thereby, it is possible to display product information on the tablet body, and it is possible to provide a tablet capable of improving identification and preventing dispensing mistakes and accidental ingestion.
　本発明によれば、薬事法で定める医薬品添加物、日本薬局方又は食品添加物公定書の基準に適合し、かつ、酸化鉄の有色顔料に対し良好な分散性を付与するモノオレイン酸デカグリセリルを含有させるので、医薬品又は食品等の錠剤等に対し、インクジェット方式での印刷を可能にする顔料組成物及びインクジェット用水性インク組成物を提供することができる。また、酸化鉄の有色顔料を用いたインクジェット用水性インク組成物は、染料等を用いたものと比較して耐光性に優れ、印刷画像の滲みも防止することができる。 According to the present invention, decaglyceryl monooleate that conforms to the standards of pharmaceutical additives, Japanese pharmacopoeia or official food additives specified by the Pharmaceutical Affairs Law and imparts good dispersibility to colored pigments of iron oxide Therefore, it is possible to provide a pigment composition and an aqueous ink composition for ink jet that enable printing by an ink jet method on tablets or the like of pharmaceuticals or foods. Further, an aqueous ink composition for ink jet using a colored pigment of iron oxide is superior in light resistance to that using a dye or the like, and can prevent bleeding of a printed image.
（顔料組成物）
　本実施の形態に係る顔料組成物は、酸化鉄の有色顔料（以下、「顔料」という場合がある。）と、モノオレイン酸デカグリセリルを少なくとも含む組成物である。 (Pigment composition)
The pigment composition according to the present embodiment is a composition containing at least a colored pigment of iron oxide (hereinafter sometimes referred to as “pigment”) and decaglyceryl monooleate.
　前記酸化鉄の有色顔料としては、例えば、黄酸化鉄、黄色三二酸化鉄、三二酸化鉄、ベンガラ、黒色酸化鉄等が挙げられる。これらの顔料は適宜必要に応じて、単独で又は二種以上を混合して用いることができる。但し、本実施の形態の顔料組成物を医薬品やサプリメント等の錠剤表面への印刷用として用いる場合、酸化鉄の有色顔料は、薬事法で定める医薬添加物、日本薬局方又は食品添加物公定書の基準に適合するものであることが好ましい。尚、本実施の形態に於いて、有色顔料とは、白色顔料以外の顔料であって、可視光波長域（３８０～７８０ｎｍ）における何れかの光を吸収するものを意味する。 Examples of the colored pigment of iron oxide include yellow iron oxide, yellow iron sesquioxide, iron sesquioxide, bengara, black iron oxide, and the like. These pigments can be used alone or in admixture of two or more as required. However, when the pigment composition of the present embodiment is used for printing on the surface of tablets such as pharmaceuticals and supplements, the colored pigment of iron oxide is a pharmaceutical additive, Japanese pharmacopoeia or a food additive official standard specified by the Pharmaceutical Affairs Law. It is preferable to meet the above criteria. In the present embodiment, the colored pigment means a pigment other than a white pigment that absorbs any light in the visible light wavelength region (380 to 780 nm).
　前記顔料の平均一次粒子径（体積平均粒子径）としては、３０ｎｍ～８００ｎｍが好ましく、５０ｎｍ～５００ｎｍがより好ましく、７５ｎｍ～４００ｎｍが特に好ましい。前記平均一次粒子径が３０ｎｍ以上であると、耐光性の低下を抑制することができる。その一方、前記平均一次粒子径が８００ｎｍ以下であると、高色彩化が図れる。尚、平均一次粒子径は、顔料をＳＥＭ（走査型電子顕微鏡）やＴＥＭ（透過型電子顕微鏡）で観察して求めた算術平均径である。また、本実施の形態に於いては、単分散の粒径分布を持つ顔料を用いるが、本実施の形態はこれに限定されず、広い粒径分布を持つ顔料を用いてもよい。また、単分散の粒径分布を持つ顔料を２種以上混合して使用してもよい。 The average primary particle size (volume average particle size) of the pigment is preferably 30 nm to 800 nm, more preferably 50 nm to 500 nm, and particularly preferably 75 nm to 400 nm. When the average primary particle size is 30 nm or more, a decrease in light resistance can be suppressed. On the other hand, when the average primary particle diameter is 800 nm or less, high color can be achieved. The average primary particle diameter is an arithmetic average diameter obtained by observing the pigment with SEM (scanning electron microscope) or TEM (transmission electron microscope). In this embodiment, a pigment having a monodispersed particle size distribution is used. However, the present embodiment is not limited to this, and a pigment having a wide particle size distribution may be used. Two or more pigments having a monodispersed particle size distribution may be mixed and used.
　前記顔料の含有量は画像濃度に直接影響するものであり、後述の水性インク組成物の保存性、粘度及びｐＨ等に影響を及ぼすものである。従って、前記顔料の含有量はこれらの点を考慮して適宜設定すればよい。通常は、顔料組成物の全質量に対し２質量％～２０質量％の範囲が好ましく、５質量％～１５質量％の範囲内がより好ましい。顔料の含有量を２質量％以上にすることにより、画像濃度の低下を抑制することができる。その一方、顔料の含有量を２０質量％以下にすることにより、光沢性の低下、ノズルの目詰まり、及び吐出安定性の低下を防止することができる。 The pigment content directly affects the image density, and affects the storage stability, viscosity, pH and the like of the aqueous ink composition described below. Therefore, the content of the pigment may be appropriately set in consideration of these points. Usually, the range of 2% by mass to 20% by mass is preferable with respect to the total mass of the pigment composition, and more preferably within the range of 5% by mass to 15% by mass. By setting the pigment content to 2% by mass or more, a decrease in image density can be suppressed. On the other hand, by setting the pigment content to 20% by mass or less, it is possible to prevent a decrease in gloss, nozzle clogging, and a decrease in ejection stability.
　分散状態にある前記顔料の平均分散粒子径Ｄ５０は、２５ｎｍ～３００ｎｍの範囲内が好ましく、１００ｎｍ～３００ｎｍの範囲内がより好ましく、７５ｎｍ～２５０ｎｍの範囲内が更に好ましく、７５ｎｍ～２１０ｎｍの範囲内が特に好ましい。また、前記顔料の分散粒子径Ｄ９９（体積積算粒度分布における積算粒度で９９％の粒径）は、１００ｎｍ～９００ｎｍの範囲内が好ましく、１００ｎｍ～６００ｎｍの範囲内がより好ましく、１００ｎｍ～５００ｎｍの範囲内が特に好ましい。前記Ｄ５０を２５ｎｍ以上にすることにより、分散安定性、耐光性及び吐出安定性の悪化を防止し、印刷濃度の低下も防止することができる。その一方、前記Ｄ５０を３００ｎｍ以下、又はＤ９９を９００ｎｍ以下にすることにより、前記顔料の分離や沈降を防止し、分散安定性の維持が図れる。尚、顔料の平均分散粒子径Ｄ５０及びＤ９９は、マイクロトラックＵＰＡ－ＥＸ１５０（商品名、日機装(株)製）を用いて動的光散乱法により測定した値である。 The average dispersed particle diameter D50 of the pigment in the dispersed state is preferably in the range of 25 nm to 300 nm, more preferably in the range of 100 nm to 300 nm, still more preferably in the range of 75 nm to 250 nm, and in the range of 75 nm to 210 nm. Particularly preferred. The dispersed particle diameter D99 of the pigment (99% in terms of cumulative particle size distribution in the volume cumulative particle size distribution) is preferably in the range of 100 nm to 900 nm, more preferably in the range of 100 nm to 600 nm, and in the range of 100 nm to 500 nm. The inside is particularly preferable. By setting the D50 to 25 nm or more, it is possible to prevent the dispersion stability, light resistance and ejection stability from being deteriorated, and to prevent the printing density from being lowered. On the other hand, when the D50 is 300 nm or less or the D99 is 900 nm or less, the separation and sedimentation of the pigment can be prevented and the dispersion stability can be maintained. The average dispersed particle diameters D50 and D99 of the pigment are values measured by a dynamic light scattering method using Microtrac UPA-EX150 (trade name, manufactured by Nikkiso Co., Ltd.).
　前記モノオレイン酸デカグリセリルは顔料分散剤としての機能を有する。モノオレイン酸デカグリセリルを配合することにより、酸化鉄の有色顔料の分散性の向上が図れる。また、モノオレイン酸デカグリセリルは、食品添加物公定書等に適合するものである。従って、モノオレイン酸デカグリセリルは、医薬品又は食品等の錠剤等への印刷用に好適に用いることができる。 The decaglyceryl monooleate has a function as a pigment dispersant. By adding decaglyceryl monooleate, the dispersibility of the colored pigment of iron oxide can be improved. In addition, decaglyceryl monooleate is compatible with the official food additive regulations. Therefore, decaglyceryl monooleate can be suitably used for printing on tablets or the like of pharmaceuticals or foods.
　モノオレイン酸デカグリセリルのＨＬＢ（親水性親油性比）は１０～１４であることが好ましく、１０～１３であることがより好ましく、１１～１２であることが特に好ましい。前記ＨＬＢが１０以上であると、当該モノオレイン酸デカグリセリルの分散媒に対する親和性が良好になり、分散安定性が向上する。その一方、前記ＨＬＢが１４以下であると、モノオレイン酸デカグリセリルの顔料表面に対する吸着が容易となり、分散性の低下を防止することができる。尚、前記ＨＬＢの値は、グリフィン法によるＨＬＢ値であり、下記式によって得られる値を意味する。
　ＨＬＢ値＝２０×（親水基の式量の和／分子量）
ＨＬＢ値は０～２０の範囲内の値となり、ＨＬＢ値が大きいほど親水性が強くなり、ＨＬＢ値が小さいほど疎水性が強くなる。 The HLB (hydrophilic / lipophilic ratio) of decaglyceryl monooleate is preferably 10 to 14, more preferably 10 to 13, and particularly preferably 11 to 12. When the HLB is 10 or more, the affinity of the decaglyceryl monooleate for the dispersion medium is improved, and the dispersion stability is improved. On the other hand, when the HLB is 14 or less, adsorption of decaglyceryl monooleate to the pigment surface is facilitated, and a decrease in dispersibility can be prevented. The HLB value is an HLB value according to the Griffin method and means a value obtained by the following equation.
HLB value = 20 × (sum of formula weight of hydrophilic group / molecular weight)
The HLB value is a value in the range of 0 to 20. The larger the HLB value, the stronger the hydrophilicity, and the smaller the HLB value, the stronger the hydrophobicity.
　前記酸化鉄の有色顔料と前記モノオレイン酸デカグリセリルとの含有比は、質量基準で１：０．３～１：１であることが好ましく、１：０．３～１：０．８であることがより好ましく、１：０．４～１：０．７５であることが特に好ましい。前記含有比が１：０．３以上であると、顔料の分散性の低下を防止することができる。その一方、前記含有比が１：１以下であると、例えば、インクジェット用水性インク組成物に用いた場合に、ノズルプレートの付着に起因する吐出安定性の低下を防止することができる。 The content ratio of the colored pigment of iron oxide and the decaglyceryl monooleate is preferably 1: 0.3 to 1: 1, more preferably 1: 0.3 to 1: 0.8 on a mass basis. It is more preferable that the ratio is 1: 0.4 to 1: 0.75. When the content ratio is 1: 0.3 or more, it is possible to prevent a decrease in dispersibility of the pigment. On the other hand, when the content ratio is 1: 1 or less, for example, when used in an aqueous inkjet ink composition, it is possible to prevent a decrease in ejection stability due to adhesion of the nozzle plate.
　本実施の形態に係る顔料組成物に於いては、顔料を分散させるための分散媒が含まれる。分散媒としては水が挙げられ、より詳細には、イオン交換水、限外ろ過水、逆浸透水、蒸留水等の純水、又は超純水等のイオン性不純物を除去したものが挙げられる。特に、紫外線照射又は過酸化水素添加等により滅菌処理した水は、長期間にわたってカビやバクテリアの発生を防止することができるので好適である。また、分散媒の含有量としては特に限定されず、適宜必要に応じて設定することができる。 In the pigment composition according to the present embodiment, a dispersion medium for dispersing the pigment is included. Examples of the dispersion medium include water, and more specifically, pure water such as ion-exchanged water, ultrafiltrated water, reverse osmosis water, and distilled water, or those obtained by removing ionic impurities such as ultrapure water. . In particular, water sterilized by ultraviolet irradiation or addition of hydrogen peroxide is preferable because generation of mold and bacteria can be prevented over a long period of time. Moreover, it is not specifically limited as content of a dispersion medium, It can set as needed suitably.
　また、前記分散媒としては、前記水と水溶性有機溶剤の混合溶液を用いてもよい。前記水溶性有機溶剤としては特に限定されず、具体的には、例えば、メチルアルコール、エチルアルコール、ｎ－ブチルアルコール、イソブチルアルコール、ｔｅｒｔ－ブチルアルコール、ｎ－プロピルアルコール、イソプロピルアルコールなどのアルコール類；ジメチルホルムアミド、ジメチルアセトアミドなどのアミド類；アセトン、メチルエチルケトンなどのケトン類；テトラヒドロフラン、ジオキサン、エチレングリコールメチルエーテル、エチレングリコールエチルエーテル、ジエチレングリコールメチルエーテル、ジエチレングリコールエチルエーテル、トリエチレングリコールモノメチルエーテル、トリエチレングリコールモノエチルエーテルなどのエーテル類；エチレングリコール、プロピレングリコール、ブチレングリコール、ジエチレングリコール、トリエチレングリコール、１，２，６－へキサントリオール、チオジグリコール、ポリエチレングリコール、ポリプロピレングリコール、グリセリン、ジグリセリン、ポリグリセリンなどの多価アルコール類；Ｎ－メチルピロリドン、１，３－ジメチル－２－イミダゾリジノン等が挙げられる。これらは一種単独で、又は二種以上を混合して用いてもよい。また、これらの水溶性有機溶剤のうち、薬事法で定める医薬品添加物、日本薬局方又は食品添加物公定書の基準に該当するものとして、エチルアルコール、ｎ－ブチルアルコール、イソブチルアルコール、ｎ－プロピルアルコール、イソプロピルアルコール、アセトン、プロピレングリコール、ポリエチレングリコール、グリセリンが好ましい。さらに、分散媒に水溶性有機溶剤を用いる場合の配合量としては特に限定されず、適宜必要に応じて設定することができる。 Further, as the dispersion medium, a mixed solution of water and a water-soluble organic solvent may be used. The water-soluble organic solvent is not particularly limited, and specifically, for example, alcohols such as methyl alcohol, ethyl alcohol, n-butyl alcohol, isobutyl alcohol, tert-butyl alcohol, n-propyl alcohol, isopropyl alcohol; Amides such as dimethylformamide and dimethylacetamide; Ketones such as acetone and methyl ethyl ketone; Tetrahydrofuran, dioxane, ethylene glycol methyl ether, ethylene glycol ethyl ether, diethylene glycol methyl ether, diethylene glycol ethyl ether, triethylene glycol monomethyl ether, triethylene glycol mono Ethers such as ethyl ether; ethylene glycol, propylene glycol, butylene glycol , Diethylene glycol, triethylene glycol, 1,2,6-hexanetriol, thiodiglycol, polyethylene glycol, polypropylene glycol, glycerin, diglycerin, polyglycerin and other polyhydric alcohols; N-methylpyrrolidone, 1,3 -Dimethyl-2-imidazolidinone and the like. You may use these individually by 1 type or in mixture of 2 or more types. Among these water-soluble organic solvents, ethyl alcohol, n-butyl alcohol, isobutyl alcohol, n-propyl are those that fall under the standards of pharmaceutical additives, Japanese pharmacopoeia or food additives official regulations stipulated by the Pharmaceutical Affairs Law. Alcohol, isopropyl alcohol, acetone, propylene glycol, polyethylene glycol and glycerin are preferred. Furthermore, the blending amount when a water-soluble organic solvent is used as the dispersion medium is not particularly limited, and can be appropriately set as necessary.
　本実施の形態の顔料組成物の製造方法においては、顔料、モノオレイン酸デカグリセリル、分散媒及び必要に応じて配合するその他の添加剤の混合方法及び添加順序は特に限定されない。例えば、 顔料、 モノオレイン酸デカグリセリル及び分散媒としての水等を一度に混合し、この混合液に対し通常の分散機を用いて分散処理を施せばよい。 このときの分散時間は特に限定されないが、顔料の平均分散粒子径が前記の数値範囲内となるように設定するのが好ましい。 In the method for producing the pigment composition of the present embodiment, the mixing method and the order of addition of the pigment, decaglyceryl monooleate, the dispersion medium, and other additives blended as necessary are not particularly limited. For example, a soot pigment, soot monodecoleate, water as a dispersion medium, and the like may be mixed at once, and the mixture may be subjected to a dispersion treatment using a normal disperser.分散 The dispersion time at this time is not particularly limited, but is preferably set so that the average dispersed particle diameter of the pigment falls within the above numerical range.
　分散処理における分散時間は特に限定されず、適宜必要に応じて設定することができる。顔料の分散処理の際に使用される前記分散機としては、一般に使用される分散機であれば特に限定されない。具体的には、例えば、ボールミル、ロールミル、サンドミル、ビーズミル、ペイントシェーカー、ナノマイザー等が挙げられる。 The dispersion time in the dispersion process is not particularly limited, and can be set as necessary. The disperser used in the pigment dispersion treatment is not particularly limited as long as it is a commonly used disperser. Specific examples include a ball mill, a roll mill, a sand mill, a bead mill, a paint shaker, and a nanomizer.
　尚、本実施の形態の顔料組成物は、最終製品たるインクジェット用水性インク組成物（詳細については後述する）の形態のほか、当該水性インク組成物を調製するための顔料分散液の形態をも包含するものである。 The pigment composition of the present embodiment has a form of a pigment dispersion for preparing the water-based ink composition in addition to a form of a water-based ink composition for inkjet (details will be described later) as a final product. It is included.
（インクジェット用水性インク組成物）
　本実施の形態に係るインクジェット用水性インク組成物（以下、「水性インク組成物」という。）は、少なくとも前記顔料組成物を含み、主溶媒が水である水性インクである。また、本実施の形態の水性インク組成物は可食性を有し、インクジェット記録用として好適に用いられるものである。さらに、水性インク組成物は色材として顔料が用いられることから、染料を用いたインク組成物と比較して発色性や耐光性、耐水性等の点で優れている。 (Water-based ink composition for inkjet)
The aqueous inkjet ink composition (hereinafter referred to as “aqueous ink composition”) according to the present embodiment is an aqueous ink containing at least the pigment composition and having a main solvent of water. Further, the water-based ink composition of the present embodiment has edible properties and is suitably used for inkjet recording. Furthermore, since a pigment is used as a coloring material, the water-based ink composition is superior in terms of color developability, light resistance, water resistance and the like as compared with an ink composition using a dye.
　前記顔料組成物の含有量は、水性インク組成物の全質量に対し顔料分換算で１質量％～２０質量％の範囲が好ましく、５質量％～１０質量％の範囲内がより好ましい。顔料組成物の含有量を１質量％以上にすることにより、着色力を向上させることができる。その一方、顔料組成物の含有量を２０質量％以下にすることにより、分散性を向上させることができる。 The content of the pigment composition is preferably in the range of 1% by mass to 20% by mass, and more preferably in the range of 5% by mass to 10% by mass, in terms of pigment, with respect to the total mass of the aqueous ink composition. By making the content of the pigment composition 1% by mass or more, the coloring power can be improved. On the other hand, dispersibility can be improved by making the content of the pigment composition 20% by mass or less.
　本実施の形態に係る水性インク組成物に於いては、水（主溶媒としての水）を含有する。前記水としては、イオン交換水、限外ろ過水、逆浸透水、蒸留水等の純水、又は超純水等のイオン性不純物を除去したものを用いるのが好ましい。特に、紫外線照射又は過酸化水素添加等により滅菌処理した水は、長期間にわたってカビやバクテリアの発生を防止することができるので好適である。また、水の含有量としては特に限定されず、適宜必要に応じて設定することができる。 The water-based ink composition according to the present embodiment contains water (water as a main solvent). As the water, it is preferable to use water from which ionic impurities such as ion-exchanged water, ultrafiltered water, reverse osmosis water, distilled water, or ultrapure water have been removed. In particular, water sterilized by ultraviolet irradiation or addition of hydrogen peroxide is preferable because generation of mold and bacteria can be prevented over a long period of time. Moreover, it does not specifically limit as content of water, It can set suitably as needed.
　本実施の形態の水性インク組成物においては、その他の添加剤が配合されていてもよい。但し、医薬品等の錠剤に対するインクジェット用インクとして用いる場合には、薬事法で定める医薬品添加物、日本薬局方又は食品添加物公定書の基準に適合するものであることが好ましい。前記添加剤としては、水溶性樹脂、有機アミン、界面活性剤、ｐＨ調整剤、キレート化剤、防腐剤、粘度調整剤、消泡剤等が挙げられる。これらの添加剤の含有量は特に限定されず、適宜必要に応じて設定することができる。 In the water-based ink composition of the present embodiment, other additives may be blended. However, when used as an ink-jet ink for tablets such as pharmaceuticals, it is preferably one that complies with the standards of pharmaceutical additives, Japanese pharmacopoeia or official food additives specified by the Pharmaceutical Affairs Law. Examples of the additive include water-soluble resins, organic amines, surfactants, pH adjusters, chelating agents, preservatives, viscosity adjusters, and antifoaming agents. The content of these additives is not particularly limited, and can be appropriately set as necessary.
　本実施の形態の水性インク組成物は、前述の各成分を適宜な方法で混合することよって製造することができる。即ち、例えば、顔料組成物の分散液に、別途前記添加剤等を加え、更に水にて希釈する。その後、十分に撹拌し、必要に応じて目詰まりの原因となる粗大粒径及び異物を除去するための濾過を行う。これにより、本実施の形態に係る水性インク組成物を得ることができる。 The water-based ink composition of the present embodiment can be produced by mixing the aforementioned components by an appropriate method. That is, for example, the additive is separately added to the dispersion of the pigment composition, and further diluted with water. Thereafter, the mixture is sufficiently stirred, and if necessary, filtration is performed to remove coarse particles and foreign matters that cause clogging. Thereby, the water-based ink composition which concerns on this Embodiment can be obtained.
　各材料の混合方法としては特に限定されず、例えば、メカニカルスターラー、マグネチックスターラー等の撹拌装置を備えた容器に順次材料を添加して撹拌混合を行うことができる。また、濾過方法としては特に限定されず、例えば、遠心濾過、フィルター濾過等を採用することができる。 The mixing method of each material is not particularly limited, and for example, the materials can be sequentially added to a container equipped with a stirring device such as a mechanical stirrer or a magnetic stirrer to perform stirring and mixing. Moreover, it does not specifically limit as a filtration method, For example, centrifugal filtration, filter filtration, etc. are employable.
　本実施の形態の水性インク組成物は、インク及び塗料に適用することができる。また、本実施の形態の水性インク組成物は、酸化鉄の有色顔料の分散性に優れているので、インクジェット用インクに好適に使用することができる。特に、本実施の形態の水性インク組成物は、薬事法等で定められている医薬品添加物、日本薬局方又は食品添加物公定書の基準に適合した顔料及び顔料分散剤を用いているので、可食性を有しており、医薬品又はサプリメント等の錠剤の表面に直接印刷することが可能である。また、素錠及びＯＤ錠など表面の平滑性が悪い錠剤に対しても、インクジェット方式による非接触印刷が可能にする。さらに、水性インク組成物は耐光性にも優れているので、医薬品又はサプリメント等の錠剤の表面に直接印刷しても滲みの発生を防止することができる。 The water-based ink composition of the present embodiment can be applied to ink and paint. In addition, the aqueous ink composition of the present embodiment is excellent in dispersibility of the colored pigment of iron oxide, and thus can be suitably used for ink jet ink. In particular, the water-based ink composition of the present embodiment uses a pharmaceutical additive, a pigment and a pigment dispersant that conform to the standards of the Japanese Pharmacopoeia or the Food Additives Standard defined by the Pharmaceutical Affairs Law, etc. It is edible and can be printed directly on the surface of tablets such as pharmaceuticals or supplements. In addition, non-contact printing by an ink jet method is possible even for tablets with poor surface smoothness such as uncoated tablets and OD tablets. Furthermore, since the water-based ink composition is also excellent in light resistance, the occurrence of bleeding can be prevented even if it is directly printed on the surface of a tablet such as a pharmaceutical or a supplement.
（錠剤）
　本実施の形態の錠剤は、前記水性インク組成物からなるインクジェット用水性インクを用いて、インクジェット記録方法により、その表面に直接印刷されたものである。上述の通り、水性インク組成物は耐光性に優れ、滲みの発生もないので、錠剤には、製品情報など使用者の識別性を向上させるための各種情報を印刷することでき、その結果、調剤ミスや誤飲の防止が可能になる。 (tablet)
The tablet according to the present embodiment is directly printed on the surface of the tablet by the inkjet recording method using the inkjet aqueous ink comprising the aqueous ink composition. As described above, since the water-based ink composition is excellent in light resistance and does not cause bleeding, various information for improving the user's identification property such as product information can be printed on the tablet. It is possible to prevent mistakes and accidental ingestion.
　錠剤は常温下において固体状であり、例えば、有効成分を含む錠剤材料を一定の形状に圧縮及び／又は成形により製造されたものが好ましい。錠剤の形状は特に限定されず、任意の形状を採用することできる。また、錠剤は、医薬品用途の錠剤であってもよく、食品用途の錠剤であってもよい。食品用途の錠剤の例としては、錠菓やサプリメント等の健康食品が挙げられる。 Tablets are solid at normal temperature, and for example, tablets produced by compressing and / or molding a tablet material containing an active ingredient into a certain shape are preferable. The shape of the tablet is not particularly limited, and any shape can be adopted. The tablet may be a pharmaceutical use tablet or a food use tablet. Examples of tablets for food use include health foods such as tablet confectionery and supplements.
　錠剤の表面に対するインクジェット記録方法については、特に限定されない。具体的には、例えば、微細なノズルより前記水性インク組成物を液滴として吐出し、その液滴を錠剤表面に付着させることにより行うことができる。吐出方法として特に限定されず、例えば、連続噴射型（荷電制御型、スプレー型等）、オンデマンド型（ピエゾ方式、サーマル方式、静電吸引方式等）等の公知の方法を採用することができる。 The ink jet recording method for the tablet surface is not particularly limited. Specifically, for example, the water-based ink composition can be discharged as droplets from a fine nozzle, and the droplets can be adhered to the tablet surface. The discharge method is not particularly limited, and for example, a known method such as a continuous injection type (charge control type, spray type, etc.), an on-demand type (piezo type, thermal type, electrostatic suction type, etc.) can be employed. .
　以下に、この発明の好適な実施例を例示的に詳しく説明する。但し、下記の実施例に記載されている材料や含有量等は、特に限定的な記載がない限りは、この発明の範囲をそれらのみに限定するものではない。 Hereinafter, preferred embodiments of the present invention will be described in detail by way of example. However, materials, contents, and the like described in the following examples are not intended to limit the scope of the present invention only to those unless otherwise specified.
（実施例１～６）
　下記表１に示す配合組成にて、実施例１～６の顔料組成物を調製した。また、各実施例の顔料組成物の調製は、次の操作によって調製した。即ち、表１に示す各材料を容器中に入れて混合し、分散機（ペイントシェーカー、浅田鉄工株式会社製）にて常温で４時間（分散時間）分散した。これにより、各実施例１～６の顔料組成物を得た。尚、下記表１中の数値は、特に記載がない限り全て質量部で表したものである。また、各材料は何れも薬事法で定める医薬品添加物、日本薬局方又は食品添加物公定書の基準に適合するものである。 (Examples 1 to 6)
The pigment compositions of Examples 1 to 6 were prepared with the composition shown in Table 1 below. Moreover, the pigment composition of each Example was prepared by the following operation. That is, each material shown in Table 1 was put in a container, mixed, and dispersed with a disperser (Paint Shaker, manufactured by Asada Tekko Co., Ltd.) at room temperature for 4 hours (dispersion time). As a result, pigment compositions of Examples 1 to 6 were obtained. The numerical values in Table 1 below are all expressed in parts by mass unless otherwise specified. Each material complies with the standards of pharmaceutical additives, Japanese pharmacopoeia or official food additives specified by the Pharmaceutical Affairs Law.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
（比較例１～８）
　下記表２に示す配合組成にて、比較例１～８の顔料組成物を調製した。また、各比較例の顔料組成物の調製は、次の操作によって調製した。即ち、表２に示す各材料を容器中に入れて混合し、分散機にて常温で４時間（分散時間）分散した。これにより、各比較例１～８の顔料組成物を得た。尚、下記表２中の数値は、表１の場合と同様、特に記載がない限り全て質量部で表したものである。また、各材料は何れも薬事法で定める医薬品添加物、日本薬局方又は食品添加物公定書の基準に適合するものである。さらに、表２中のオイドラギットＲＳ３０Ｄ、オイドラギットＲＬ３０Ｄ、オイドラギットＬ３０Ｄ－５５、オイドラギットＮＥ３０Ｄは樹脂であるため、ＨＬＢ値は存在しない。 (Comparative Examples 1 to 8)
The pigment compositions of Comparative Examples 1 to 8 were prepared with the composition shown in Table 2 below. Moreover, the pigment composition of each comparative example was prepared by the following operation. That is, each material shown in Table 2 was put in a container, mixed, and dispersed with a disperser at room temperature for 4 hours (dispersion time). As a result, pigment compositions of Comparative Examples 1 to 8 were obtained. The numerical values in Table 2 below are all expressed in parts by mass unless otherwise specified, as in Table 1. Each material complies with the standards of pharmaceutical additives, Japanese pharmacopoeia or official food additives specified by the Pharmaceutical Affairs Law. Further, since Eudragit RS30D, Eudragit RL30D, Eudragit L30D-55, and Eudragit NE30D in Table 2 are resins, there is no HLB value.
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
（顔料の平均分散粒子径の測定）
　各実施例及び比較例の顔料組成物における顔料の平均分散粒子径Ｄ５０又はＤ９９は、マイクロトラックＵＰＡ－ＥＸ１５０（商品名、日機装(株)製）を用いて動的光散乱法により測定した。結果を前記表１及び２に示す。 (Measurement of average dispersed particle size of pigment)
The average dispersed particle diameter D50 or D99 of the pigments in the pigment compositions of Examples and Comparative Examples was measured by a dynamic light scattering method using Microtrac UPA-EX150 (trade name, manufactured by Nikkiso Co., Ltd.). The results are shown in Tables 1 and 2 above.
（結果）
　表１に示す実施例１～６の実験結果から分かる通り、各種の酸化鉄からなる顔料に対し、モノオレイン酸デカグリセリルを顔料分散剤として配合させた場合には、顔料の平均分散粒子径Ｄ５０及びＤ９９の値を小さくすることができ、分散性に極めて優れた顔料組成物を製造できることが確認された。 (result)
As can be seen from the experimental results of Examples 1 to 6 shown in Table 1, when decaglyceryl monooleate was added as a pigment dispersant to pigments composed of various iron oxides, the average dispersed particle size D50 of the pigments And it was confirmed that the value of D99 can be made small and a pigment composition having extremely excellent dispersibility can be produced.
　その一方、比較例１～８においては、表２から明らかな通り、いずれの顔料分散剤を用いても酸化鉄の有色顔料の平均分散粒子径Ｄ５０及びＤ９９の値が大きくなっていた。その結果、これらの顔料組成物については顔料の分散性が十分でなく、インクジェット方式での医薬品や食品等の錠剤等に対する印刷に適さないことが確認された。 On the other hand, in Comparative Examples 1 to 8, as is apparent from Table 2, the average dispersed particle diameters D50 and D99 of the colored pigment of iron oxide were large regardless of which pigment dispersant was used. As a result, it was confirmed that these pigment compositions have insufficient dispersibility of the pigment and are not suitable for printing on tablets or the like of pharmaceuticals and foods by the inkjet method.

Claims (7)

  1. 　酸化鉄からなる有色顔料と、モノオレイン酸デカグリセリルとを含む顔料組成物。 A pigment composition containing a colored pigment made of iron oxide and decaglyceryl monooleate.
  2. 　前記酸化鉄の有色顔料と前記モノオレイン酸デカグリセリルとの含有比が、質量基準で１：０．３～１：１である請求項１に記載の顔料組成物。 2. The pigment composition according to claim 1, wherein the content ratio of the colored pigment of iron oxide and the decaglyceryl monooleate is 1: 0.3 to 1: 1 on a mass basis.
  3. 　前記モノオレイン酸デカグリセリルのＨＬＢが１０～１４である請求項１又は２に記載の顔料組成物。 The pigment composition according to claim 1 or 2, wherein the decaglyceryl monooleate has an HLB of 10 to 14.
  4. 　前記酸化鉄の有色顔料の平均一次粒子径が３０ｎｍ～８００ｎｍである請求項１～３の何れか１項に記載の顔料組成物。 The pigment composition according to any one of claims 1 to 3, wherein an average primary particle diameter of the colored pigment of iron oxide is 30 nm to 800 nm.
  5. 　分散している前記酸化鉄の有色顔料の平均分散粒子径Ｄ５０が２５ｎｍ～３００ｎｍである請求項１～４の何れか１項に記載の顔料組成物。 The pigment composition according to any one of claims 1 to 4, wherein an average dispersed particle diameter D50 of the colored pigment of iron oxide dispersed is 25 nm to 300 nm.
  6. 　請求項１～５の何れか１項に記載の顔料組成物を含み、かつ、可食性を有するインクジェット用水性インク組成物。 An aqueous inkjet ink composition comprising the pigment composition according to any one of claims 1 to 5 and having edible properties.
  7. 　インクジェット用水性インクの液滴を吐出し、当該液滴を付着させて印刷を行うインクジェット記録方法により、表面に印刷された錠剤であって、
    　前記インクジェット用水性インクが、請求項６に記載のインクジェット用水性インク組成物からなる錠剤。
          A tablet printed on the surface by an inkjet recording method in which droplets of water-based ink for inkjet are ejected, and the droplets are attached to perform printing,
    The tablet which the said water-based ink for inkjets consists of the water-based ink composition for inkjets of Claim 6.
PCT/JP2015/070830 2014-08-29 2015-07-22 Pigment composition and inkjet water-based ink composition WO2016031438A1 (en)

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