JPH09227817A - Water-base fluorescent ink for jet printing and method for marking therewith - Google Patents

Water-base fluorescent ink for jet printing and method for marking therewith

Info

Publication number
JPH09227817A
JPH09227817A JP3169496A JP3169496A JPH09227817A JP H09227817 A JPH09227817 A JP H09227817A JP 3169496 A JP3169496 A JP 3169496A JP 3169496 A JP3169496 A JP 3169496A JP H09227817 A JPH09227817 A JP H09227817A
Authority
JP
Japan
Prior art keywords
water
ink
fluorescent
wavelength
excitation energy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP3169496A
Other languages
Japanese (ja)
Inventor
Masaaki Kunimatsu
松 正 昭 国
Tetsuo Sugawa
川 哲 夫 須
Tsuneo Shirota
田 常 雄 城
Katsutaka Nakatsu
津 克 隆 中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dai Nippon Toryo KK
Original Assignee
Dai Nippon Toryo KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dai Nippon Toryo KK filed Critical Dai Nippon Toryo KK
Priority to JP3169496A priority Critical patent/JPH09227817A/en
Publication of JPH09227817A publication Critical patent/JPH09227817A/en
Withdrawn legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a fluorescent ink which leaves a large amount of a fluorescent dye on the surface of a substrate to increase the concentration of the dye on the surface and to thereby form images having high fluorescent intensity on the surface. SOLUTION: This ink contains water-dispersible acrylic resin microparticles having a mean particle diameter of 0.05-0.5μm, a water-soluble resin and a fluorescent dye which absorbs substantially no excitation energy at a wavelength of 400-600nm and absorbs excitation energy at a wavelength of 650-900nm to emit fluorescence. This method comprises printing the surface of a substrate with this ink by means of a ink jet printer and irradiating the surface with excitation energy at a wavelength of 650-900nm to allow the prints to emit fluorescence.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、被印刷体表面の蛍
光染料濃度を高くすることができ励起エネルギーを照射
することにより蛍光発光するジェット印刷用水性蛍光イ
ンク及び励起エネルギーを照射することにより蛍光発光
する蛍光発光マーキング方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jet printing aqueous fluorescent ink capable of increasing the concentration of a fluorescent dye on the surface of an object to be printed and emitting fluorescent light by irradiating excitation energy, and fluorescent by irradiating excitation energy. The present invention relates to a fluorescent light emission marking method.

【0002】[0002]

【従来の技術】蛍光染料を含有するインクを用いてイン
クジェットプリンターにより被印刷体表面に印刷して、
その印刷表面上に紫外光や赤外光などの励起エネルギー
の照射により蛍光発光する印字、図形、バーコード等の
マークを形成する方法や、そのような方法に用いるジェ
ット印刷用蛍光インクは、例えば特公昭62−5079
号、特公昭62−24024号、特表平6−50059
0号等の公報に記載されていて公知である。
2. Description of the Related Art Printing is performed on the surface of a printing medium by an ink jet printer using an ink containing a fluorescent dye.
A method for forming a mark such as a print, a figure, a barcode, or the like that emits fluorescence by irradiating excitation light such as ultraviolet light or infrared light on the printing surface, and a fluorescent ink for jet printing used in such a method, for example, Tokiko Sho 62-5079
No., Japanese Patent Publication No. 62-24024, Tokuyohei 6-50059
No. 0 and the like are publicly known.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、これら
の公報に記載の方法もしくは蛍光インクについては、被
印刷体として例えば紙や布等の吸液性のある基材表面を
用いる場合には、インク中の蛍光染料が溶媒と共に被印
刷体深部に浸透、拡散するので、被印刷体表面における
蛍光染料の濃度が低下し、蛍光発光強度が不十分とな
り、特に吸液性被印刷体が墨等により着色されている場
合にこの傾向が顕著であるという問題点があった。ま
た、被印刷体表面における蛍光染料の濃度を高くするこ
とは操作的にあるいは経済的に困難であった。
However, in the methods or fluorescent inks described in these publications, when a liquid-absorbent substrate surface such as paper or cloth is used as the printing medium, Since the fluorescent dye of the above penetrates and diffuses into the deep part of the printing material together with the solvent, the concentration of the fluorescent dye on the surface of the printing material decreases, the fluorescence emission intensity becomes insufficient, and especially the liquid-absorbent printing material is colored by black ink or the like. However, there is a problem that this tendency is remarkable in the case of being. In addition, it has been difficult to increase the concentration of the fluorescent dye on the surface of the printing medium operationally or economically.

【0004】本発明は、上記したような従来技術のイン
クジェットプリンターによる蛍光発光マーキング方法も
しくは蛍光インクにおける問題点を解決することを目的
とするものであり、即ち、より多量の蛍光染料が被印刷
体表面に残留するようにし、励起エネルギーの照射によ
り蛍光発光強度の高い像を形成することのできる蛍光発
光マーキング方法及びそれに用いるジェット印刷用水性
蛍光インクを提供することを目的とする。
An object of the present invention is to solve the above-mentioned problems in the fluorescent marking method or the fluorescent ink by the ink jet printer of the prior art, that is, a larger amount of the fluorescent dye is applied to the printing medium. An object of the present invention is to provide a fluorescent emission marking method capable of remaining on the surface and forming an image with high fluorescent emission intensity by irradiation with excitation energy, and a water-based fluorescent ink for jet printing used therefor.

【0005】[0005]

【課題を解決するための手段】本発明者らは、上記の課
題を解決するために種々研究を行った結果、水分散性ア
クリル樹脂微粒子を含有させた水性蛍光インクを用いて
インクジェットプリンターにより被印刷体表面に印刷し
た場合には、被印刷体表面が紙や布等の吸液性のある基
材表面であっても、該微粒子が被印刷体深部に浸透する
ことなしで被印刷体表面に固着し、又これら微粒子の表
面に蛍光染料が付着し易いので、被印刷体深部への蛍光
染料の浸透が減少し、その結果被印刷体表面の蛍光染料
濃度が高くなり、従って、励起エネルギーの照射により
蛍光発光強度の高いマークが形成されるという知見を得
て本発明を完成した。
As a result of various studies to solve the above-mentioned problems, the inventors of the present invention used an aqueous fluorescent ink containing water-dispersible acrylic resin fine particles to print with an inkjet printer. When printed on the surface of a printed material, even if the surface of the printed material is a liquid-absorbent substrate surface such as paper or cloth, the fine particles do not penetrate into the deep part of the printed material and the surface of the printed material Since the fluorescent dye easily adheres to the surface of these fine particles and the fluorescent dye easily adheres to the surface of these fine particles, the penetration of the fluorescent dye into the deep part of the printing material is reduced, and as a result, the concentration of the fluorescent dye on the surface of the printing material is increased, and therefore the excitation energy is increased. The present invention has been completed based on the finding that a mark having a high fluorescence emission intensity is formed by the irradiation of.

【0006】即ち、本発明のジェット印刷用水性蛍光イ
ンクは、平均粒子径0.05〜0.5μmの水分散性ア
クリル樹脂微粒子、水溶性樹脂及び400〜600nm
の波長の励起エネルギーをほとんど吸収せず、650〜
900nmの波長の励起エネルギーを吸収して蛍光を発
する蛍光染料を含有することを特徴とする。
That is, the water-based fluorescent ink for jet printing of the present invention comprises water-dispersible acrylic resin fine particles having an average particle diameter of 0.05 to 0.5 μm, a water-soluble resin and 400 to 600 nm.
Hardly absorbs the excitation energy of the wavelength of
It is characterized by containing a fluorescent dye which absorbs excitation energy of a wavelength of 900 nm and emits fluorescence.

【0007】また、本発明の蛍光発光マーキング方法
は、平均粒子径0.05〜0.5μmの水分散性アクリ
ル樹脂微粒子、水溶性樹脂及び400〜600nmの波
長の励起エネルギーをほとんど吸収せず、650〜90
0nmの波長の励起エネルギーを吸収して蛍光を発する
蛍光染料を含有する水性蛍光インクを用いてインクジェ
ットプリンターにより被印刷体表面に印刷し、その印刷
表面上に650〜900nmの波長の励起エネルギーを
照射して蛍光発光させることを特徴とする。
The fluorescent emission marking method of the present invention hardly absorbs water-dispersible acrylic resin fine particles having an average particle diameter of 0.05 to 0.5 μm, a water-soluble resin and excitation energy having a wavelength of 400 to 600 nm, 650-90
An aqueous fluorescent ink containing a fluorescent dye that emits fluorescence by absorbing excitation energy with a wavelength of 0 nm is used to print on the surface of a material to be printed with an inkjet printer, and the printed surface is irradiated with excitation energy with a wavelength of 650 to 900 nm. To emit fluorescent light.

【0008】以下に本発明を具体的に説明する。本発明
のジェット印刷用水性蛍光インクは、前記した特定の平
均粒子径を有する水分散性アクリル樹脂微粒子、水溶性
樹脂、前記した特定の吸収特性を有する蛍光染料及び溶
媒としての水を必須成分とし含有し、さらに必要に応じ
て水混和性有機溶剤や各種添加剤等を含有することがで
きる。
The present invention will be specifically described below. The water-based fluorescent ink for jet printing of the present invention contains water-dispersible acrylic resin fine particles having the specific average particle diameter described above, a water-soluble resin, a fluorescent dye having the specific absorption characteristics described above, and water as a solvent as essential components. In addition, if necessary, a water-miscible organic solvent, various additives and the like can be contained.

【0009】本発明で用いる水分散性アクリル樹脂微粒
子は、被印刷体表面の蛍光染料濃度を高くして蛍光発光
強度の高いマークを形成させるために配合する成分であ
る。即ち、吸液性のある被印刷体の場合には、蛍光染料
は溶媒と共に被印刷体の深部に浸透、拡散し易いが、蛍
光インク中に水分散性アクリル樹脂微粒子を配合する
と、これらの微粒子は被印刷体の深部に浸透することな
しで表面に残存し、その被印刷体表面に残存する微粒子
がジェット印刷の前又はジェット印刷時に蛍光染料を吸
着して、蛍光染料が被印刷体深部へ浸透することを抑制
し、その結果、被印刷体表面の蛍光染料濃度が高くな
り、従って、励起エネルギーの照射により高い蛍光発光
強度を示すマークが形成されるのである。
The water-dispersible acrylic resin fine particles used in the present invention are components to be added in order to increase the concentration of the fluorescent dye on the surface of the material to be printed to form marks having high fluorescence emission intensity. That is, in the case of a liquid-absorbent material to be printed, the fluorescent dye easily penetrates and diffuses into the deep portion of the material to be printed together with the solvent. However, when water-dispersible acrylic resin fine particles are mixed in the fluorescent ink, these fine particles are added. Remains on the surface without penetrating into the deep part of the material to be printed, and the fine particles remaining on the surface of the material to be printed adsorb the fluorescent dye before or during jet printing, and the fluorescent dye goes to the deep part of the material to be printed. Penetration is suppressed, and as a result, the concentration of the fluorescent dye on the surface of the material to be printed is increased, so that the irradiation of the excitation energy forms a mark showing a high fluorescence emission intensity.

【0010】水分散性アクリル樹脂微粒子の平均粒子径
が0.05μm未満になると、そのような水分散性アク
リル樹脂微粒子は被印刷体の表面に残存しにくくなり、
被印刷体の内部に浸透するために前述の効果が十分発揮
できなくなる。従って、水分散性アクリル樹脂微粒子が
被印刷体の表面に残存するためにはその平均粒子径は
0.05μm以上である必要がある。一方、インクジェ
ットプリンターのノズル詰まりが生じないためには、水
分散性アクリル樹脂微粒子の平均粒子径が0.5μm以
下である必要がある。
When the average particle size of the water-dispersible acrylic resin fine particles is less than 0.05 μm, such water-dispersible acrylic resin fine particles are less likely to remain on the surface of the printing medium,
Since it penetrates into the inside of the material to be printed, the above-mentioned effects cannot be sufficiently exhibited. Therefore, in order for the water-dispersible acrylic resin fine particles to remain on the surface of the material to be printed, their average particle diameter must be 0.05 μm or more. On the other hand, the average particle size of the water-dispersible acrylic resin fine particles needs to be 0.5 μm or less so that the nozzle clogging of the inkjet printer does not occur.

【0011】本発明においては、水分散性アクリル樹脂
微粒子として、従来から広く知られているα,β−エチ
レン性不飽和モノマーを乳化剤、ラジカル開始剤の存在
下、水中で乳化重合させて得られるエマルジョン樹脂を
使用することができるが、乳化剤がインク中に入り込む
とインク中に泡が発生しやすくなり、均質なマーキング
形成に支障をきたすことがある。そのため本発明におい
ては、通常の乳化剤の代わりに反応性乳化剤を使用し、
乳化重合させて得た水分散性アクリル樹脂微粒子を用い
ることによりインク中での泡の発生を防止することが特
に好ましい。
In the present invention, the water-dispersible acrylic resin fine particles are obtained by emulsion-polymerizing a widely known α, β-ethylenically unsaturated monomer in water in the presence of an emulsifier and a radical initiator. Although an emulsion resin can be used, if an emulsifier gets into the ink, bubbles tend to be generated in the ink, which may hinder the formation of a uniform marking. Therefore, in the present invention, a reactive emulsifier is used instead of the usual emulsifier,
It is particularly preferable to prevent the generation of bubbles in the ink by using the water-dispersible acrylic resin fine particles obtained by emulsion polymerization.

【0012】なお、反応性乳化剤とは、専ら乳化作用を
呈するのみではなく、それ自体が例えばα,β−エチレ
ン性不飽和モノマーなどと反応しうる官能基を有し、か
かる官能基による反応を介して、例えば重合体の骨格中
に取り込まれるようなものをいう。具体的には、α,β
−不飽和カルボン酸モノエステル、(メタ)アクリル酸
のアルキレンオキサイド付加物、ポリオキシアルキレン
モノアリルエーテルの(メタ)アクリル酸エステル、ビ
ニルスルホン酸、スルホアルキル(メタ)アクリレー
ト、アリルアルキルイタコネート硫酸エステルあるいは
これらの塩類などの重合性不飽和二重結合を有するよう
な化合物が挙げられる。反応性乳化剤は、α,β−エチ
レン性不飽和モノマー100重量部に対し0.3〜10
重量部使用するのが適当である。
The reactive emulsifier not only has an emulsifying function but also has a functional group capable of reacting with, for example, an α, β-ethylenically unsaturated monomer, and reacts with such a functional group. Through the polymer skeleton, for example. Specifically, α, β
-Unsaturated carboxylic acid monoester, alkylene oxide adduct of (meth) acrylic acid, (meth) acrylic acid ester of polyoxyalkylene monoallyl ether, vinyl sulfonic acid, sulfoalkyl (meth) acrylate, allyl alkyl itaconate sulfate ester Alternatively, compounds having a polymerizable unsaturated double bond such as salts thereof may be mentioned. The reactive emulsifier is 0.3 to 10 relative to 100 parts by weight of the α, β-ethylenically unsaturated monomer.
It is appropriate to use parts by weight.

【0013】前記のα,β−エチレン性不飽和モノマー
としては、(メタ)アクリル酸メチル、(メタ)アクリ
ル酸エチル、(メタ)アクリル酸ブチル、(メタ)アク
リル酸2−エチルヘキシル、(メタ)アクリル酸ラウリ
ル等の(メタ)アクリル酸エステル;酢酸ビニル、プロ
ピオン酸ビニル等のビニルエステル;スチレン、ビニル
トルエン等の芳香族ビニルモノマー;エチレン、プロピ
レン等のオレフィン;ジアリルフタレート、ジビニルベ
ンゼン、アリルアクリレート等の不飽和二重結合を有す
るモノマー;グリシジル(メタ)アクリレート、(メ
タ)アクリル酸、(メタ)アクリル酸ヒドロキシエチ
ル、N−メチロール(メタ)アクリルアミド、(メタ)
アクリル酸ジメチルアミノエチル等の官能基含有モノマ
ーあるいはこれらの2種以上の混合物が挙げられる。い
ずれにしろ、インク中で安定に分散するものであれば各
種アクリル樹脂微粒子が使用可能である。
The above α, β-ethylenically unsaturated monomers include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and (meth). (Meth) acrylic acid esters such as lauryl acrylate; vinyl esters such as vinyl acetate and vinyl propionate; aromatic vinyl monomers such as styrene and vinyltoluene; olefins such as ethylene and propylene; diallyl phthalate, divinylbenzene, allyl acrylate, etc. A monomer having an unsaturated double bond; glycidyl (meth) acrylate, (meth) acrylic acid, hydroxyethyl (meth) acrylate, N-methylol (meth) acrylamide, (meth)
Examples thereof include functional group-containing monomers such as dimethylaminoethyl acrylate, and mixtures of two or more thereof. In any case, various acrylic resin fine particles can be used as long as they can be stably dispersed in the ink.

【0014】本発明で用いる水溶性樹脂は、蛍光染料や
水分散性アクリル樹脂微粒子をインク中に安定に分散さ
せ、インクの貯蔵安定性をよくし、均質なマーキング形
成ができるようにするために、また水分散性アクリル樹
脂微粒子が被印刷体表面に強固に付着するようにするた
めに、さらに、インクジェットプリンターのノズルに付
着した微粒子が簡単に除去できるようにするために配合
する成分である。
The water-soluble resin used in the present invention stably disperses a fluorescent dye or water-dispersible acrylic resin fine particles in the ink, improves the storage stability of the ink, and enables uniform marking formation. Further, it is a component to be added in order to firmly adhere the water-dispersible acrylic resin fine particles to the surface of the printing medium and to easily remove the fine particles adhered to the nozzle of the inkjet printer.

【0015】水溶性樹脂としては、インクや塗料に一般
的に使用されているものが特に制限もなく使用でき、具
体的には、ポリアクリル酸、ポリアクリル酸塩、スチレ
ン−マレイン酸共重合体、スチレンスルホン酸−マレイ
ン酸共重合体、ポリエステル、ヒドロキシエチルセルロ
ース、ポリビニルアルコール、マルトシルサイクロデキ
ストリン、ポリエチレングリコール等が代表的なものと
して挙げられる。
As the water-soluble resin, those commonly used in inks and paints can be used without particular limitation. Specifically, polyacrylic acid, polyacrylic acid salt, and styrene-maleic acid copolymer can be used. Typical examples thereof include styrene sulfonic acid-maleic acid copolymer, polyester, hydroxyethyl cellulose, polyvinyl alcohol, maltosyl cyclodextrin, polyethylene glycol and the like.

【0016】本発明で用いる蛍光染料は、400〜60
0nmの波長の励起エネルギーをほとんど吸収せず、6
50〜900nmの波長の励起エネルギーを吸収して蛍
光を発する蛍光染料である。すなわち可視光照射などで
は視認しにくいが、赤外光照射などでは蛍光発光して視
認が容易になる蛍光染料である。具体的には、レーザー
染料であるDTTCI(CAS登録番号3071−70
−3)、HDITCI(CAS登録番号23178−6
7−8)、IR−125(CAS登録番号3599−3
2−4)、IR−132(CAS登録番号62669−
62−9)、IR−140(CAS登録番号53655
−17−7)、H.I.D.C. Iodide (CAS登録番号36
536−22−8)等が代表的なものとして挙げられ
る。なお、紫外光のような波長の短い励起エネルギーで
蛍光発光する染料は被印刷体の背景蛍光に干渉されるの
で本発明においては不適である。
The fluorescent dye used in the present invention is 400 to 60.
It absorbs almost no excitation energy at a wavelength of 0 nm, and
It is a fluorescent dye that emits fluorescence by absorbing excitation energy having a wavelength of 50 to 900 nm. That is, it is a fluorescent dye that is difficult to visually recognize by irradiation with visible light, but easily emits fluorescence by irradiation with infrared light. Specifically, laser dye DTTCI (CAS registration number 3071-70
-3), HDITCI (CAS registration number 23178-6
7-8), IR-125 (CAS registration number 3599-3
2-4), IR-132 (CAS registration number 62669-
62-9), IR-140 (CAS registration number 53655.
-17-7), HIDC Iodide (CAS registration number 36
536-22-8) etc. are mentioned as a typical thing. A dye that emits fluorescence with excitation energy having a short wavelength such as ultraviolet light interferes with the background fluorescence of the printing medium and is not suitable for the present invention.

【0017】本発明において用いる溶媒は水であり、好
ましくは蒸留水又はイオン交換水であり、さらに必要に
応じてメチルアルコール、エチルアルコール、イソプロ
ピルアルコール、ジオキサン、アセトン、メチルエチル
ケトン、カルビトール、ジメチルスルホキシド等の水混
和性有機溶剤を一部併用することも可能である。本発明
の蛍光インクは、以上に説明した成分を必須成分として
含有し、これらの配合割合については、インク固形分基
準で、水分散性アクリル樹脂微粒子が60〜90重量
%、好ましくは70〜86重量%、水溶性樹脂が5〜3
5重量%、好ましくは10〜30重量%、蛍光染料が
0.001〜5重量%、好ましくは0.05〜1重量%
であり、またインク固形分は10〜50重量%、好まし
くは25〜46重量%であることが適当である。
The solvent used in the present invention is water, preferably distilled water or ion-exchanged water, and if necessary, methyl alcohol, ethyl alcohol, isopropyl alcohol, dioxane, acetone, methyl ethyl ketone, carbitol, dimethyl sulfoxide, etc. It is also possible to partly use the water-miscible organic solvent. The fluorescent ink of the present invention contains the components described above as essential components, and the mixing ratio of these components is 60 to 90% by weight, preferably 70 to 86% by weight of water-dispersible acrylic resin fine particles based on the solid content of the ink. % By weight, water-soluble resin 5 to 3
5% by weight, preferably 10 to 30% by weight, fluorescent dye 0.001 to 5% by weight, preferably 0.05 to 1% by weight
It is suitable that the solid content of the ink is 10 to 50% by weight, preferably 25 to 46% by weight.

【0018】なお、本発明のジェット印刷用水性蛍光イ
ンクは、更に、硝酸リチウム、亜硝酸リチウム、亜硫酸
アンモニウム、蟻酸アンモニウム、酢酸アンモニウム、
ハロゲン化リチウム、チオシアン酸ソーダ等の電導度調
整剤、アミン変性シリコーン系分散剤等の分散剤、防腐
剤等の添加剤を0.1〜5重量%の量で含有することが
できる。
The water-based fluorescent ink for jet printing of the present invention further comprises lithium nitrate, lithium nitrite, ammonium sulfite, ammonium formate, ammonium acetate,
A conductivity adjusting agent such as lithium halide and sodium thiocyanate, a dispersant such as an amine-modified silicone dispersant, and an additive such as a preservative can be contained in an amount of 0.1 to 5% by weight.

【0019】また、本発明のジェット印刷用水性蛍光イ
ンクはインクジェットプリンターによる印刷に適応した
特性を有している必要がある。従って、本発明のジェッ
ト印刷用水性蛍光インクは、粘度が約1〜10mPa・
sec(20℃)、比抵抗が約50〜3000Ω・c
m、比重が約0.8〜1.2、表面張力が約20〜60
ダイン/cmの範囲であることが望ましい。
Further, the water-based fluorescent ink for jet printing of the present invention needs to have characteristics suitable for printing by an ink jet printer. Therefore, the aqueous fluorescent ink for jet printing of the present invention has a viscosity of about 1 to 10 mPa · s.
sec (20 ° C), specific resistance of about 50-3000Ω ・ c
m, specific gravity of about 0.8 to 1.2, surface tension of about 20 to 60
It is preferably in the range of dyne / cm.

【0020】本発明のジェット印刷用水性蛍光インク
は、前述の全成分を一度に混合攪拌するか、又は蛍光染
料と水分散性アクリル樹脂微粒子と水溶性樹脂と溶媒の
一部とを予め混合攪拌して微粒子に蛍光染料を吸着さ
せ、これらと残部成分とを混合攪拌し、次いで使用する
インクジェットプリンターのノズル径の約1/10以下
のポアーサイズを有するフィルターで濾過、精製するこ
とにより調製できる。本発明においては、インクジェッ
トプリンターとして、従来から公知の各種プリンターを
使用することができ、例えば荷電制御方式、インクオン
ディマンド方式、サーマルヘッドによりインクを吐出さ
せる方式等が代表的なものとして挙げられる。
In the aqueous fluorescent ink for jet printing of the present invention, all the above-mentioned components are mixed and stirred at once, or the fluorescent dye, the water-dispersible acrylic resin fine particles, the water-soluble resin and a part of the solvent are mixed and stirred in advance. Then, the fluorescent dye is adsorbed to the fine particles, these components and the remaining components are mixed and stirred, and then filtered and purified with a filter having a pore size of about 1/10 or less of the nozzle diameter of the inkjet printer to be used. In the present invention, various conventionally known printers can be used as the inkjet printer, and examples thereof include a charge control system, an ink-on-demand system, and a system in which ink is ejected by a thermal head.

【0021】本発明の蛍光発光マーキング方法において
は、被印刷体表面に前記の水性蛍光インクをインクジェ
ットプリンターにて吐出させて所望する形態に印刷する
ことによりマークを形成する。このようにしてマーキン
グした上に650〜900nmの波長の励起エネルギー
を照射することによりマークを蛍光発光させ、目視もし
くは光検知器等の機器によりマークを判読することが可
能となる。
In the fluorescent luminescence marking method of the present invention, the mark is formed by ejecting the above-mentioned aqueous fluorescent ink on the surface of the printing medium by an ink jet printer and printing in a desired form. By irradiating excitation energy having a wavelength of 650 to 900 nm on the marking in this way, the mark is caused to emit fluorescence, and the mark can be read visually or by a device such as a photodetector.

【0022】[0022]

【実施例】以下に本発明を実施例及び比較例により詳細
に説明する。 実施例1〜3及び比較例1〜5 表1に示した配合割合(単位:重量部)で蛍光染料、水
分散性アクリル樹脂微粒子、水溶性樹脂及び溶媒を均一
に混合した後、ポアーサイズ5.0μmのメンブランフ
ィルターで濾過、精製し、各実施例及び比較例に対応す
る蛍光インクを調製した。各インクをインクジェットプ
リンターで、無印刷のハガキ及びその表面を墨で塗りつ
ぶしたハガキにドット印刷し、その印字に表1に示す波
長の励起光を照射し、蛍光分光光度計を用いて蛍光発光
強度を測定した。その結果を表1の下段に示す。
The present invention will be described below in detail with reference to examples and comparative examples. Examples 1 to 3 and Comparative Examples 1 to 5 The fluorescent dye, the water-dispersible acrylic resin fine particles, the water-soluble resin and the solvent were uniformly mixed at the blending ratio (unit: parts by weight) shown in Table 1, and then the pore size was set to 5. A fluorescent ink corresponding to each Example and Comparative Example was prepared by filtering and purifying with a 0 μm membrane filter. Dot-print each ink on an unprinted postcard or a postcard whose surface is filled with black ink with an inkjet printer, irradiate the print with excitation light of the wavelength shown in Table 1, and use a fluorescence spectrophotometer to measure the fluorescence emission intensity. Was measured. The results are shown in the lower part of Table 1.

【0023】なお、実施例1、比較例1〜2においては
比較例2の無印刷ハガキにおける蛍光発光強度を100
とした場合の相対値として示した。また実施例2、比較
例3〜4においては比較例4の無印刷ハガキにおける蛍
光発光強度を100とした場合の相対値として示した。
また実施例3、比較例5においては比較例5の無印刷ハ
ガキにおける蛍光発光強度を100とした場合の相対値
として示した。また、各インクを室温で1ヶ月間静置後
のインクの状態を目視観察した。その結果を表1の下段
に示す。なお、評価基準は次の通りである。 ○:異常なし ×:樹脂微粒子又は染料の沈降、分離が発生 また、ノズルがインク詰まりを生じた際、その除去性を
調べるため、各インクをガラス板に塗布、乾燥させた
後、水中に1分間浸漬し、インクの再溶解性を調べた。
その結果を表1の下段に示す。なお、評価基準は次の通
りである。 ○:インクは再溶解し、ガラス板に残存せず ×:インクがガラス板に残存する
In Example 1 and Comparative Examples 1 and 2, the fluorescence emission intensity of the non-printed postcard of Comparative Example 2 was 100.
It was shown as a relative value when. Further, in Example 2 and Comparative Examples 3 to 4, relative values are shown when the fluorescence emission intensity of the non-printed postcard of Comparative Example 4 is 100.
In addition, in Example 3 and Comparative Example 5, the relative values are shown when the fluorescence emission intensity of the non-printed postcard of Comparative Example 5 is 100. In addition, each ink was visually observed after being allowed to stand at room temperature for one month. The results are shown in the lower part of Table 1. The evaluation criteria are as follows. ◯: No abnormality x: Sedimentation and separation of resin fine particles or dye occurred. Also, when ink clogging occurred in the nozzle, each ink was applied to a glass plate and dried to check its removability. It was dipped for a minute, and the re-solubility of the ink was examined.
The results are shown in the lower part of Table 1. The evaluation criteria are as follows. ◯: The ink was redissolved and did not remain on the glass plate. X: The ink remained on the glass plate.

【0024】[0024]

【表1】 [Table 1]

【0025】表1より明らかな通り、本発明のインクで
ある実施例1,2,3はいずれも蛍光発光強度が高く、
墨塗りハガキの無印刷ハガキに対する蛍光発光強度比も
高いものであり、さらに貯蔵安定性、再溶解性も良好で
あった。一方、水溶性樹脂を配合しない比較例1,3は
貯蔵安定性、再溶解性が不良であった。また、水分散性
アクリル樹脂粒子を配合しない比較例2,4,5は蛍光
発光強度が低く、墨塗りハガキの無印刷ハガキに対する
蛍光発光強度比も低いものであった。
As is clear from Table 1, all of Examples 1, 2 and 3 which are inks of the present invention have high fluorescence emission intensity,
The ratio of the fluorescence emission intensity of the black-painted postcard to that of the non-printed postcard was high, and the storage stability and re-dissolution property were also good. On the other hand, Comparative Examples 1 and 3 containing no water-soluble resin had poor storage stability and redissolvability. Further, Comparative Examples 2, 4, and 5 in which the water-dispersible acrylic resin particles were not blended had low fluorescence emission intensity, and the fluorescence emission intensity ratio of the black postcard to the unprinted postcard was also low.

【0026】[0026]

【発明の効果】本発明のジェット印刷用水性蛍光インク
は、吸液性の被印刷体にインクジェットプリンターによ
り印刷しても被印刷体表面での蛍光染料濃度が高くな
り、蛍光発光強度の高いマークを形成することができ
る。
INDUSTRIAL APPLICABILITY The water-based fluorescent ink for jet printing of the present invention has a high fluorescent dye concentration on the surface of a liquid-absorbent material to be printed by an ink jet printer, resulting in a mark having high fluorescence emission intensity. Can be formed.

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】平均粒子径0.05〜0.5μmの水分散
性アクリル樹脂微粒子、水溶性樹脂及び400〜600
nmの波長の励起エネルギーをほとんど吸収せず、65
0〜900nmの波長の励起エネルギーを吸収して蛍光
を発する蛍光染料を含有することを特徴とするジェット
印刷用水性蛍光インク。
1. Water-dispersible acrylic resin fine particles having an average particle diameter of 0.05 to 0.5 μm, a water-soluble resin, and 400 to 600.
65, which absorbs almost no excitation energy at a wavelength of nm,
A water-based fluorescent ink for jet printing, which comprises a fluorescent dye that absorbs excitation energy having a wavelength of 0 to 900 nm and emits fluorescence.
【請求項2】インク固形分基準で、水分散性アクリル樹
脂微粒子を60〜90重量%、水溶性樹脂を5〜35重
量%及び蛍光染料を0.001〜5重量%含有すること
を特徴とする請求項1記載のジェット印刷用水性蛍光イ
ンク。
2. The ink comprises 60 to 90% by weight of water-dispersible acrylic resin fine particles, 5 to 35% by weight of a water-soluble resin, and 0.001 to 5% by weight of a fluorescent dye, based on the solid content of the ink. The water-based fluorescent ink for jet printing according to claim 1.
【請求項3】平均粒子径0.05〜0.5μmの水分散
性アクリル樹脂微粒子、水溶性樹脂及び400〜600
nmの波長の励起エネルギーをほとんど吸収せず、65
0〜900nmの波長の励起エネルギーを吸収して蛍光
を発する蛍光染料を含有する水性蛍光インクを用いてイ
ンクジェットプリンターにより被印刷体表面に印刷し、
その印刷表面上に650〜900nmの波長の励起エネ
ルギーを照射して蛍光発光させることを特徴とする蛍光
発光マーキング方法。
3. Water-dispersible acrylic resin fine particles having an average particle diameter of 0.05 to 0.5 μm, a water-soluble resin, and 400 to 600.
65, which absorbs almost no excitation energy at a wavelength of nm,
Printing on the surface of the printed material with an inkjet printer using an aqueous fluorescent ink containing a fluorescent dye that emits fluorescence by absorbing excitation energy of a wavelength of 0 to 900 nm,
A fluorescent emission marking method, characterized in that the printed surface is irradiated with excitation energy of a wavelength of 650 to 900 nm to cause fluorescent emission.
JP3169496A 1996-02-20 1996-02-20 Water-base fluorescent ink for jet printing and method for marking therewith Withdrawn JPH09227817A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3169496A JPH09227817A (en) 1996-02-20 1996-02-20 Water-base fluorescent ink for jet printing and method for marking therewith

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3169496A JPH09227817A (en) 1996-02-20 1996-02-20 Water-base fluorescent ink for jet printing and method for marking therewith

Publications (1)

Publication Number Publication Date
JPH09227817A true JPH09227817A (en) 1997-09-02

Family

ID=12338192

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3169496A Withdrawn JPH09227817A (en) 1996-02-20 1996-02-20 Water-base fluorescent ink for jet printing and method for marking therewith

Country Status (1)

Country Link
JP (1) JPH09227817A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002108259A (en) * 2000-09-29 2002-04-10 Fujitsu Isotec Ltd Base material having invisible hidden-display in base material
US6762217B2 (en) 2001-06-12 2004-07-13 Kao Corporation Water-based ink
US20090186155A1 (en) * 2008-01-21 2009-07-23 Brother Kogyo Kabushiki Kaisha Ink for ink-jet recording, ink cartridge, ink-jet recording apparatus, method of determining, and method of ink-jet recording
JP2014062163A (en) * 2012-09-20 2014-04-10 General Co Ltd Non-aqueous inkjet ink and ink set
CN104497630A (en) * 2014-12-25 2015-04-08 郑州鸿盛数码科技股份有限公司 Fluorescent disperse dye dispersion, preparation method thereof and fluorescent disperse dye ink

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002108259A (en) * 2000-09-29 2002-04-10 Fujitsu Isotec Ltd Base material having invisible hidden-display in base material
US6762217B2 (en) 2001-06-12 2004-07-13 Kao Corporation Water-based ink
US20090186155A1 (en) * 2008-01-21 2009-07-23 Brother Kogyo Kabushiki Kaisha Ink for ink-jet recording, ink cartridge, ink-jet recording apparatus, method of determining, and method of ink-jet recording
US8534820B2 (en) 2008-01-21 2013-09-17 Brother Kogyo Kabushiki Kaisha Ink for ink-jet recording, ink cartridge, ink-jet recording apparatus, method of determining, and method of ink-jet recording
JP2014062163A (en) * 2012-09-20 2014-04-10 General Co Ltd Non-aqueous inkjet ink and ink set
CN104497630A (en) * 2014-12-25 2015-04-08 郑州鸿盛数码科技股份有限公司 Fluorescent disperse dye dispersion, preparation method thereof and fluorescent disperse dye ink

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