JP2015025096A - Water-in-oil emulsion ink for stencil printing - Google Patents
Water-in-oil emulsion ink for stencil printing Download PDFInfo
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本発明は、孔版印刷用油中水型エマルションインクに関し、詳細には紫外線（ブラックライト等）の光を当てて簡易的に発光を検出することが可能な孔版印刷用油中水型エマルションインクに関するものである。 The present invention relates to a water-in-oil emulsion ink for stencil printing, and more particularly, to a water-in-oil emulsion ink for stencil printing that can detect light emission simply by applying light of ultraviolet rays (black light or the like). Is.
孔版印刷は孔版印刷用原紙を用いて製版を行い、製版により形成された原紙の穿孔部にインクを通過させて紙などの被印刷体に印刷を行うものであり、その操作性の良さ・簡便性によって、幅広い分野で利用されている。孔版印刷用インクとしては、油中水型のエマルションインクが一般的に用いられている。エマルションインクは、印刷物裏側にインクが浸透することが少なく、印刷物の印刷濃度を高くすることができるものである。 In stencil printing, stencil printing is used to make a stencil, and the ink is passed through the perforated part of the stencil formed by the stencil printing to print on the printed material such as paper. It is used in a wide range of fields depending on sex. As the stencil printing ink, a water-in-oil emulsion ink is generally used. Emulsion ink is one in which the ink hardly penetrates into the back side of the printed matter, and can increase the printing density of the printed matter.
従来より、可視光下では視認できず、紫外線照射時に視認可能なステルスインクは、印刷物の偽造や改鼠の防止等に使用されている。ところで、一般的な印刷用紙の中には、紙の白色度を高く見せるために、蛍光増白剤が含まれているものがある。そのような印刷用紙にステルスインクを印刷すると、紫外線により印刷用紙の蛍光増白剤も青色に発光してしまい、ステルスインクの発光が本来のインクの色味とは異なって見えてしまうという問題がある。印刷用紙によって色味が異なって見えてしまうため、色味が重要視される場合には、印刷用紙を選ぶ必要が出てくる。 Conventionally, stealth ink that is not visible under visible light but visible when irradiated with ultraviolet rays has been used to prevent counterfeiting and tampering of printed matter. Incidentally, some general printing papers contain a fluorescent whitening agent in order to make the whiteness of the paper appear high. When stealth ink is printed on such printing paper, the fluorescent whitening agent of the printing paper also emits blue light due to ultraviolet rays, and the light emission of stealth ink looks different from the original ink color. is there. Since the color appears differently depending on the printing paper, it is necessary to select the printing paper when the color is important.
このような問題を解決する技術として、特許文献１には記録媒体（印刷用紙）の影響を受けない画像を形成することが可能な蛍光顔料組成物が記載されている。これは特定の蛍光顔料を可視光波長領域で実質的に白色の微粒子状態としたものである。 As a technique for solving such a problem, Patent Document 1 describes a fluorescent pigment composition capable of forming an image that is not affected by a recording medium (printing paper). This is a specific fluorescent pigment in the form of fine white particles in the visible light wavelength region.
しかし、特許文献１に記載されている蛍光顔料組成物は顔料自体を合成するものであるため難易度が高く、収率も低いという問題がある。
本発明は上記事情に鑑みなされたものであり、蛍光増白剤を含む用紙に印刷しても、紫外線照射時の蛍光増白剤の青色発光の影響を受けにくく、本来の色味の発色が得られ、保存安定性の高い孔版印刷用油中水型エマルションインクを提供することを目的とするものである。
However, since the fluorescent pigment composition described in Patent Document 1 synthesizes the pigment itself, there is a problem that the degree of difficulty is high and the yield is low.
The present invention has been made in view of the above circumstances, and even when printed on a paper containing a fluorescent brightening agent, it is not easily affected by the blue light emission of the fluorescent brightening agent at the time of ultraviolet irradiation, and the original color development is achieved. It is an object of the present invention to provide a water-in-oil emulsion ink for stencil printing obtained and having high storage stability.
本発明の孔版印刷用油中水型エマルションインクは、油相および水相からなる孔版印刷用エマルションインクにおいて、油相または水相のいずれかに、金属を含まない有機紫外蛍光色素と白色顔料とを含むことを特徴とするものである。
白色顔料は酸化チタンであることが好ましい。
The water-in-oil emulsion ink for stencil printing of the present invention is an emulsion ink for stencil printing comprising an oil phase and an aqueous phase, and an organic ultraviolet fluorescent dye and a white pigment that do not contain a metal in either the oil phase or the water phase. It is characterized by including.
The white pigment is preferably titanium oxide.
本発明の孔版印刷用油中水型エマルションインクは油相または水相のいずれかに、金属を含まない有機紫外蛍光色素と白色顔料とを含むので、紫外線で発光した蛍光増白剤青色発光を隠ぺいし、有機紫外蛍光色素本来の色味を得ることができるため、どのような印刷用紙に印刷しても本来の色味、発色を得ることが可能となる。また、本発明の孔版印刷用油中水型エマルションインクに含まれる有機紫外蛍光色素は、金属を含まないので、エマルションインクの油相と水相との界面のバランスを崩すことがなく、インクの分離を起こすことがないためインクの保存安定性を確保することができる。 Since the water-in-oil emulsion ink for stencil printing of the present invention contains an organic ultraviolet fluorescent dye containing no metal and a white pigment in either the oil phase or the aqueous phase, the fluorescent whitening agent emitting blue light emitted by ultraviolet rays is emitted. Since it is concealed and the original color of the organic ultraviolet fluorescent dye can be obtained, it is possible to obtain the original color and color even when printing on any printing paper. Further, since the organic ultraviolet fluorescent dye contained in the water-in-oil emulsion ink for stencil printing of the present invention does not contain a metal, the balance of the interface between the oil phase and the water phase of the emulsion ink is not lost, and the ink Since no separation occurs, the storage stability of the ink can be ensured.
以下、本発明の孔版印刷用油中水型エマルションインク（以下、単にインクともいう）を詳細に説明する。本発明のインクは、油相および水相からなる孔版印刷用エマルションインクにおいて、油相または水相のいずれかに、金属を含まない有機紫外蛍光色素と白色顔料とを含むことを特徴とする。 Hereinafter, the water-in-oil emulsion ink for stencil printing (hereinafter also simply referred to as ink) of the present invention will be described in detail. The ink of the present invention is an emulsion ink for stencil printing comprising an oil phase and an aqueous phase, and is characterized in that either an oil phase or an aqueous phase contains a metal-free organic ultraviolet fluorescent dye and a white pigment.
金属を含まない有機紫外蛍光色素（以下、単に有機紫外蛍光色素という）は、可視光領域（３８０〜７５０ｎｍ）で視認されず、紫外線（３８０ｎｍ未満）により励起されて可視光領域に発光波長を有する色素であり、ベンゾオキサジノン構造を有する化合物（N-[2-(4-Oxo-4H-3,1-benzoxazin-2-yl)phenyl]-2-naphthalenesulfonamide：CAS No.10128-55-9）などが好ましい。エマルションインクにランタノイド系金属などの遷移金属を含有させると、油相と水相との界面のバランスが崩れ、インクが分離する等、インクの保存安定性を確保することが困難である。 An organic ultraviolet fluorescent dye containing no metal (hereinafter simply referred to as an organic ultraviolet fluorescent dye) is not visually recognized in the visible light region (380 to 750 nm), and is excited by ultraviolet light (less than 380 nm) and has a light emission wavelength in the visible light region. A compound that is a pigment and has a benzoxazinone structure (N- [2- (4-Oxo-4H-3,1-benzoxazin-2-yl) phenyl] -2-naphthalenesulfonamide: CAS No.10128-55-9) Etc. are preferable. If the emulsion ink contains a transition metal such as a lanthanoid metal, it is difficult to ensure the storage stability of the ink, for example, the balance of the interface between the oil phase and the water phase is lost and the ink is separated.
インクに含まれる有機紫外蛍光色素は用いる有機紫外蛍光色素によっても異なるが、含有量が少なくても蛍光発色性が高いため、インク全量に対して１〜７質量％であることが好ましく、２〜７質量％がより好ましい。 Although the organic ultraviolet fluorescent dye contained in the ink varies depending on the organic ultraviolet fluorescent dye used, it is preferably 1 to 7% by mass with respect to the total amount of the ink because the fluorescence coloring property is high even if the content is small. 7 mass% is more preferable.
白色顔料としては、例えば、酸化チタン（二酸化チタン）、炭酸カルシウム、亜鉛華、硫化亜鉛、酸化アンチモン、酸化ジルコニウム等の無機顔料が挙げられる。白色顔料は記録媒体上で有機紫外蛍光色素よりも記録媒体側に定着すると、紫外線で発光した蛍光増白剤青色発光を隠ぺいする効果が高く有機紫外蛍光色素の発色がより鮮やかになることから、使用する有機紫外蛍光色素よりも比重が重いものが好ましく、中でも白色度が高く、比重の重い酸化チタンがより好ましい。白色顔料全体のインク全量に対する含有量（固形分）は、隠ぺい力とインク粘度の観点から、１〜１５質量％であることが好ましく、さらに、２〜１０質量％であることがより好ましく、３〜８質量％であることが一層好ましい。 Examples of the white pigment include inorganic pigments such as titanium oxide (titanium dioxide), calcium carbonate, zinc white, zinc sulfide, antimony oxide, and zirconium oxide. When the white pigment is fixed on the recording medium side of the recording medium rather than the organic ultraviolet fluorescent dye on the recording medium, the whitening effect of the fluorescent whitening agent emitted by the ultraviolet light is high and the color of the organic ultraviolet fluorescent dye becomes more vivid. Those having a higher specific gravity than the organic ultraviolet fluorescent dye to be used are preferred, and among them, titanium oxide having a high whiteness and a high specific gravity is more preferred. The content (solid content) of the entire white pigment with respect to the total amount of ink is preferably 1 to 15% by mass, more preferably 2 to 10% by mass, from the viewpoint of hiding power and ink viscosity. More preferably, it is -8 mass%.
本発明のインクは有機紫外蛍光色素と白色顔料とを含むので、紫外線で発光した印刷用紙に含まれる蛍光増白剤青色発光を隠ぺいし、有機紫外蛍光色素本来の色味を得ることができるため、どのような印刷用紙に印刷しても色素本来の色味、発色を得ることが可能となる。また、本発明のインクに含まれる有機紫外蛍光色素は金属を含まないので、エマルションインクの油相と水相との界面のバランスを崩すことがなく、インクの分離を起こすことがないためインクの保存安定性を確保することができる。 Since the ink of the present invention contains an organic ultraviolet fluorescent dye and a white pigment, it can conceal the blue light emission of the fluorescent brightener contained in the printing paper that emits ultraviolet light, and the original color of the organic ultraviolet fluorescent dye can be obtained. Even if it is printed on any printing paper, it is possible to obtain the original color and coloring of the dye. In addition, since the organic ultraviolet fluorescent dye contained in the ink of the present invention does not contain a metal, the balance of the interface between the oil phase and the aqueous phase of the emulsion ink is not lost, and the ink is not separated. Storage stability can be ensured.
本発明のインクは油相と水相とからなるが、有機紫外蛍光色素と白色顔料はいずれの相に含まれていてもよく、有機紫外蛍光色素と白色顔料は別々の相に含まれていてもよい。汎用性の高い有機紫外蛍光色素に鑑みるならば、安定性が高い油相に有機紫外蛍光色素と白色顔料とを含むことが好ましい。油相は、それ以外に樹脂、溶剤、乳化剤から主として構成されるが、必要に応じて、ゲル化剤、酸化防止剤等の公知の成分を適宜含ませることができる。油相の割合はインク全量に対して２０〜６０質量％であることが好ましく、３０〜５０質量％であることがより好ましい。 The ink of the present invention comprises an oil phase and an aqueous phase, and the organic ultraviolet fluorescent dye and the white pigment may be contained in any phase, and the organic ultraviolet fluorescent dye and the white pigment are contained in separate phases. Also good. In view of highly versatile organic ultraviolet fluorescent dyes, it is preferable that an organic ultraviolet fluorescent dye and a white pigment are contained in a highly stable oil phase. The oil phase is mainly composed of a resin, a solvent, and an emulsifier, but may contain a known component such as a gelling agent and an antioxidant as necessary. The ratio of the oil phase is preferably 20 to 60% by mass and more preferably 30 to 50% by mass with respect to the total amount of ink.
樹脂はインクに粘度を付与し、エマルションの安定性を向上させるもので、油相に溶解するものが用いられる。樹脂としては、たとえば、ロジン、ギルソナイト、ロジンエステル、マレイン酸樹脂、フェノール樹脂、アルキド樹脂、石油樹脂、アクリル樹脂、アミノ樹脂、ウレタン樹脂、セルロース樹脂、天然ゴム誘導体樹脂等を好ましく用いることができ、アルキド樹脂、フェノール樹脂をより好ましく用いることができる。また、アルキド樹脂またはロジン変性樹脂とアルミニウムキレート化合物またはアルミニウムアルコラートとの反応生成物も、好ましく用いることができる。
樹脂の含有量は、インク全質量に対して３〜２５質量％であることが好ましく、８〜２０質量％であることがより好ましい。
Resins impart viscosity to the ink and improve the stability of the emulsion, and those that dissolve in the oil phase are used. As the resin, for example, rosin, gilsonite, rosin ester, maleic acid resin, phenol resin, alkyd resin, petroleum resin, acrylic resin, amino resin, urethane resin, cellulose resin, natural rubber derivative resin and the like can be preferably used. Alkyd resins and phenol resins can be used more preferably. A reaction product of an alkyd resin or rosin-modified resin with an aluminum chelate compound or aluminum alcoholate can also be preferably used.
The content of the resin is preferably 3 to 25% by mass, and more preferably 8 to 20% by mass with respect to the total mass of the ink.
溶剤としては、非極性溶剤及び極性溶剤の何れも使用できる。これらは、単独で使用してもよく、単一の相を形成する限り、２種以上を組み合わせて使用できる。非極性溶剤としては、ナフテン系、パラフィン系、イソパラフィン系等の石油系炭化水素溶剤を使用でき、具体的には、ドデカンなどの脂肪族飽和炭化水素類、エクソンモービル社製「アイソパー」、「エクソール」（いずれも商品名）、ＪＸ日鉱日石社製「ＡＦソルベント」（商品名）、サン石油社製「サンセン」、「サンパー」（いずれも商品名）等が挙げられる。極性溶剤としては、エステル系溶剤、アルコール系溶剤、高級脂肪酸系溶剤、エーテル系溶剤などが挙げられる。植物油も使用でき、植物油としてはヤシ油、パーム油等の植物脂、大豆油、オリーブ油、ヒマシ油、アマニ油等が挙げられる。溶剤及び植物油の含有量は、インク全量に対して１〜５０質量％であることが好ましく、３〜２０質量％であることがより好ましい。 As the solvent, any of a nonpolar solvent and a polar solvent can be used. These may be used alone or in combination of two or more as long as they form a single phase. As the nonpolar solvent, naphthenic, paraffinic, isoparaffinic and other petroleum hydrocarbon solvents can be used. Specifically, aliphatic saturated hydrocarbons such as dodecane, “Isoper”, “Exol” manufactured by ExxonMobil Corporation (Both are trade names), “AF Solvent” (trade name) manufactured by JX Nippon Oil & Metals Co., Ltd., “Sansen” and “Samper” (both trade names) manufactured by Sun Sekiyu Co. Examples of the polar solvent include ester solvents, alcohol solvents, higher fatty acid solvents, ether solvents and the like. Vegetable oils can also be used. Examples of vegetable oils include vegetable oils such as palm oil and palm oil, soybean oil, olive oil, castor oil, and linseed oil. The content of the solvent and vegetable oil is preferably 1 to 50% by mass and more preferably 3 to 20% by mass with respect to the total amount of the ink.
乳化剤は油中水型エマルションを構成するために用いられ、アニオン界面活性剤、カチオン界面活性剤、両性界面活性剤、非イオン界面活性剤のいずれを用いてもよい。このうち、油中水型エマルションの乳化性や保存安定性の観点から、非イオン界面活性剤を用いることが好ましい。 The emulsifier is used to constitute a water-in-oil emulsion, and any of an anionic surfactant, a cationic surfactant, an amphoteric surfactant, and a nonionic surfactant may be used. Among these, it is preferable to use a nonionic surfactant from the viewpoint of the emulsifiability and storage stability of the water-in-oil emulsion.
具体的には、ソルビタンモノラウレート、ソルビタンモノパルミテート、ソルビタンモノオレエート、ソルビタンセスキオレエート、ソルビタンモノイソステアレート等のソルビタン脂肪酸エステル、グリセリルモノステアレート、ヘキサグリセリルテトラオレエート、デカグリセリルデカオレエート、ヘキサグリセリルペンタオレエート等の（ポリ）グリセリン脂肪酸エステル、ポリオキシエチレンソルビタン脂肪酸エステル、ポリオキシエチレングリセリン脂肪酸エステル、ポリオキシエチレンソルビット脂肪酸エステル、プロピレングリコール脂肪酸エステル、（ポリ）エチレングリコール脂肪酸エステル、ポリオキシエチレンアルキルエーテル、ポリオキシエチレンポリオキシプロピレンアルキルエーテル、ポリオキシエチレンアルキルフェニルエーテル、ポリオキシエチレン（硬化）ヒマシ油等を好ましく挙げることができる。上記界面活性剤は、単独で用いてもよいし、二種類以上を適宜組み合わせて用いることもできる。 Specifically, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monooleate, sorbitan sesquioleate, sorbitan fatty acid esters such as sorbitan monoisostearate, glyceryl monostearate, hexaglyceryl tetraoleate, decaglyceryl deca (Poly) glycerin fatty acid esters such as oleate and hexaglyceryl pentaoleate, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene sorbite fatty acid ester, propylene glycol fatty acid ester, (poly) ethylene glycol fatty acid ester , Polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene alcohol Phenyl ethers, polyoxyethylene (hardened) can be exemplified preferably castor oil and the like. The said surfactant may be used independently and can also be used in combination of 2 or more types as appropriate.
水相中には、水の他、必要に応じて水蒸発抑制剤（または凍結防止剤）、電解質、ｐＨ調整剤、酸化防止剤等を含ませることができる。
水蒸発抑制剤（または凍結防止剤）としては、具体的には、エチレングリコール、プロピレングリコール、ジエチレングリコール、ポリエチレングリコール、グリセリン等の多価アルコール類等の、水溶性有機溶剤等を挙げることができ、その含有量は、水相全量に対して１〜２０質量％であることが好ましく、３〜１５質量％であることがより好ましい。
In the aqueous phase, in addition to water, a water evaporation inhibitor (or antifreezing agent), an electrolyte, a pH adjuster, an antioxidant and the like can be included as necessary.
Specific examples of water evaporation inhibitors (or antifreeze agents) include water-soluble organic solvents such as polyhydric alcohols such as ethylene glycol, propylene glycol, diethylene glycol, polyethylene glycol, and glycerin. The content is preferably 1 to 20% by mass and more preferably 3 to 15% by mass with respect to the total amount of the aqueous phase.
電解質としては、硫酸ナトリウム、硫酸マグネシウム、リン酸水素カリウム、クエン酸ナトリウム、酒石酸カリウム、ホウ酸ナトリウム等が挙げられ、その含有量は、水相全量に対して０．１〜５．０質量％であることが好ましく、０．５〜２．０質量％であることがより好ましい。 Examples of the electrolyte include sodium sulfate, magnesium sulfate, potassium hydrogen phosphate, sodium citrate, potassium tartrate, sodium borate and the like, and the content thereof is 0.1 to 5.0% by mass with respect to the total amount of the aqueous phase. It is preferable that it is 0.5-2.0 mass%.
本発明のインクは、次のような手順で作製することができる。まず、有機紫外蛍光色素および白色顔料それぞれを、公知の分散機で樹脂および溶剤で分散して有機紫外蛍光色素分散体および白色顔料分散体を作製した後、有機紫外蛍光色素分散体、白色顔料分散体、溶剤、その他の油相成分を添加して油相を調製する。希釈には、公知の撹拌機を使用することができる。水相は、水相の成分を、撹拌機により水に混合・溶解することにより調製することができる。そして、公知の乳化機を使用し、攪拌下の油相中に水相を滴下することにより、本発明のインクを得ることができる。
以下に本発明のインクの実施例を示す。
The ink of the present invention can be prepared by the following procedure. First, an organic ultraviolet fluorescent dye dispersion and a white pigment dispersion are prepared by dispersing the organic ultraviolet fluorescent dye and the white pigment with a resin and a solvent using a known disperser to produce an organic ultraviolet fluorescent dye dispersion and a white pigment dispersion. The oil phase is prepared by adding body, solvent and other oil phase ingredients. A known stirrer can be used for dilution. The aqueous phase can be prepared by mixing and dissolving the components of the aqueous phase in water with a stirrer. And the ink of this invention can be obtained by dripping a water phase in the oil phase under stirring using a well-known emulsifier.
Examples of the ink of the present invention are shown below.
（インクの調製）
下記表１に示す配合（表に示す数値は質量部である）により、以下の手順に従い、各実施例、比較例のインクを調製した。まず、有機紫外蛍光色素、樹脂、溶剤の一部を混合し、三本ロールにて分散を行い、有機紫外蛍光色素分散体を調製した。続いて白色顔料、樹脂、溶剤の一部を混合し、三本ロールにて分散を行い、白色顔料分散体を調製した。調製した有機紫外蛍光色素分散体と白色顔料分散体に残りの溶剤、乳化剤を添加し、十分撹拌して、油相成分とした。これとは別に、水相成分の材料を混合、撹拌して水相成分とした。油相成分に、水相成分を徐々に添加しながら攪拌機で乳化を行ない、孔版印刷用油中水型エマルションインクを得た。
(Preparation of ink)
According to the formulation shown in the following Table 1 (the numerical values shown in the table are parts by mass), inks of Examples and Comparative Examples were prepared according to the following procedure. First, a part of the organic ultraviolet fluorescent dye, resin, and solvent were mixed and dispersed with a three roll to prepare an organic ultraviolet fluorescent dye dispersion. Subsequently, a white pigment, a resin, and a part of the solvent were mixed and dispersed with a three roll to prepare a white pigment dispersion. The remaining solvent and emulsifier were added to the prepared organic ultraviolet fluorescent dye dispersion and white pigment dispersion, and the mixture was sufficiently stirred to obtain an oil phase component. Separately from this, water phase component materials were mixed and stirred to obtain an aqueous phase component. The oil phase component was emulsified with a stirrer while gradually adding the water phase component to obtain a water-in-oil emulsion ink for stencil printing.
（評価）
実施例および比較例で得られたエマルションインクを用いて孔版印刷機（リソグラフＲＺ９７０：理想科学工業株式会社製）で蛍光増白剤を含む印刷用紙（理想用紙ＩＪマット（Ｗ）：理想科学工業株式会社製）と、蛍光増白剤を含まない印刷用紙(理想用紙薄口：理想科学工業株式会社製)に孔版印刷を行なった。得られた印刷物に３６５ｎｍの紫外線を照射し、色味と発光強度を目視で確認して以下の基準で評価した。
（色味）
Ａ：有機紫外蛍光色素本来の色味が得られる
(蛍光増白剤を含まない印刷用紙と同じ色味が得られる)
Ｂ：有機紫外蛍光色素本来の色味とは若干違うがその差は比較しなければわからない程度
Ｃ：青味が強く有機紫外蛍光色素の本来の色味が得られない
(蛍光増白剤を含む印刷用紙と含まない印刷用紙で色味が異なる)
（発光強度）
Ａ：有機紫外蛍光色素の本来の発光が得られる
Ｃ：有機紫外蛍光色素の本来の発光が得られない
(Evaluation)
Printing paper (ideal paper IJ mat (W): ideal scientific industrial stock) containing a fluorescent whitening agent with a stencil printing machine (lithographic RZ970: manufactured by Riso Kagaku Kogyo Co., Ltd.) using the emulsion inks obtained in Examples and Comparative Examples Stencil printing was carried out on printing paper containing no optical brightener (ideal paper thin mouth: produced by Riso Kagaku Kogyo Co., Ltd.). The obtained printed matter was irradiated with 365 nm ultraviolet rays, and the color and light emission intensity were visually confirmed and evaluated according to the following criteria.
(Color)
A: Original color of organic ultraviolet fluorescent dye is obtained
(The same color as printing paper that does not contain fluorescent brightener is obtained.)
B: Slightly different from the original color of the organic ultraviolet fluorescent dye, but the difference is not understood unless compared. C: The original color of the organic ultraviolet fluorescent dye cannot be obtained due to strong blueness.
(Colors differ between printing paper with and without optical brightener)
(Luminescence intensity)
A: Original emission of organic ultraviolet fluorescent dye is obtained C: Original emission of organic ultraviolet fluorescent dye cannot be obtained
（保存安定性）
実施例および比較例で得られたエマルションインクをそれぞれ密閉容器に入れて、２３℃の環境下で放置し、以下の基準で目視により評価した。
Ａ：３ヶ月以上安定し、油相と水相が分離しなかった
Ｃ：１ヶ月以内で油相と水相が分離した
インクの処方とともに、評価結果を表１に示す。
(Storage stability)
The emulsion inks obtained in Examples and Comparative Examples were put in sealed containers, left in an environment of 23 ° C., and visually evaluated according to the following criteria.
A: Stable for 3 months or more, oil phase and water phase were not separated C: Oil phase and water phase were separated within 1 month Table 1 shows the evaluation results together with the ink formulation.
表１に示すように、実施例のインクは印刷用紙の紫外線で発光した蛍光増白剤青色発光を隠ぺいし、有機紫外蛍光色素本来の色味を得ることができた。また、保存安定性も良好であった。白色顔料は炭酸カルシウムよりも酸化チタンの方が白色度が高く、比重も大きいため、色味や発光強度が良好であった（実施例１と２の比較）。一方、比較例１のインクは有機紫外蛍光色素が金属を含んでいるため、保存安定性が悪かった。比較例２や３は白色顔料を含まないため有機紫外蛍光色素本来の色味を得ることができず、比較例４は有機紫外蛍光色素が青色であるため色味には影響はなかったものの、白色顔料を含まないため発光強度が低下しているように見えた。 As shown in Table 1, the ink of the example concealed the blue light emission of the fluorescent brightener emitted by the ultraviolet rays of the printing paper, and the original color of the organic ultraviolet fluorescent dye could be obtained. Also, the storage stability was good. As for the white pigment, titanium oxide had higher whiteness and higher specific gravity than calcium carbonate, so that the color and light emission intensity were good (comparison of Examples 1 and 2). On the other hand, the ink of Comparative Example 1 was poor in storage stability because the organic ultraviolet fluorescent dye contained a metal. Although Comparative Examples 2 and 3 did not contain a white pigment, the original color of the organic ultraviolet fluorescent dye could not be obtained, and Comparative Example 4 did not affect the color because the organic ultraviolet fluorescent dye was blue, Since it did not contain a white pigment, it appeared that the emission intensity was lowered.
以上のように本発明の孔版印刷用油中水型エマルションインクは金属を含まない有機紫外蛍光色素と白色顔料とを含むので、紫外線で発光した蛍光増白剤青色発光を隠ぺいし、有機紫外蛍光色素本来の色味を得ることができるとともに、有機紫外蛍光色素は金属を含まないので、エマルションインクの油相と水相との界面のバランスを崩すことがなく、インクの分離を起こすことがないためインクの保存安定性を確保することができる。 As described above, the water-in-oil emulsion ink for stencil printing of the present invention contains an organic ultraviolet fluorescent dye and a white pigment that do not contain a metal. The original color of the dye can be obtained, and the organic ultraviolet fluorescent dye does not contain metal, so the balance of the interface between the oil phase and the aqueous phase of the emulsion ink is not lost, and ink separation does not occur. Therefore, the storage stability of the ink can be ensured.
Claims (2)
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|---|---|---|---|---|
| JPS63196675A (en) * | 1987-02-09 | 1988-08-15 | Pilot Ink Co Ltd | Opaque ink for writing board |
| JPH111651A (en) * | 1997-06-13 | 1999-01-06 | Tohoku Ricoh Co Ltd | Emulsion ink for stencil printing press |
| JPH1149997A (en) * | 1997-08-05 | 1999-02-23 | Riso Kagaku Corp | Emulsion ink for stencil printing |
| JP2002047439A (en) * | 2000-08-02 | 2002-02-12 | Riso Kagaku Corp | Light-colored emulsion ink for stencil printing and stencil printing method |
| JP2006298976A (en) * | 2005-04-15 | 2006-11-02 | Tohoku Ricoh Co Ltd | Emulsion ink for stencil printing |
| JP2006299208A (en) * | 2005-04-25 | 2006-11-02 | Tohoku Ricoh Co Ltd | Emulsion ink for stencil printing |
| JP2007224141A (en) * | 2006-02-23 | 2007-09-06 | Dainichiseika Color & Chem Mfg Co Ltd | Fluorescent pigment composition and its use |
-
2013
- 2013-07-29 JP JP2013156721A patent/JP2015025096A/en not_active Ceased
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63196675A (en) * | 1987-02-09 | 1988-08-15 | Pilot Ink Co Ltd | Opaque ink for writing board |
| JPH111651A (en) * | 1997-06-13 | 1999-01-06 | Tohoku Ricoh Co Ltd | Emulsion ink for stencil printing press |
| JPH1149997A (en) * | 1997-08-05 | 1999-02-23 | Riso Kagaku Corp | Emulsion ink for stencil printing |
| JP2002047439A (en) * | 2000-08-02 | 2002-02-12 | Riso Kagaku Corp | Light-colored emulsion ink for stencil printing and stencil printing method |
| JP2006298976A (en) * | 2005-04-15 | 2006-11-02 | Tohoku Ricoh Co Ltd | Emulsion ink for stencil printing |
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| JP2007224141A (en) * | 2006-02-23 | 2007-09-06 | Dainichiseika Color & Chem Mfg Co Ltd | Fluorescent pigment composition and its use |
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