JP3824187B2 - Electrostatic recording medium for image transfer and image transfer method - Google Patents

Description

更に、得られた離型層上に、下記の組成の溶液を、乾燥重量が１ｇ／ｍ² となるようにミヤバー塗布し、１２０℃で１０分の条件下で架橋化させた後、乾燥して剥離層を形成し、本発明の画像転写用静電記録体を作製した。
【００７７】

（画像形成方法及び現像方法）
上記で得られた画像転写用静電記録体に対して、図３に示すイオン流照射記録装置を使用し、カラー原画を色分解して得られるシアン情報に基づき、負のイオンパターン（−４０Ｖ）を形成した。
【００７８】
なお、このイオン流照射記録装置における記録ヘッドは１７２８個のイオン流通過孔を有しており、２００ＤＰＩの記録密度でＡ４幅の記録を可能とするものである。
【００７９】
このイオンパターンを形成した画像転写用静電記録体を、下記のシアン現像剤を有するローラー現像器で現像し、シアン画像を有する画像転写用静電記録体を得た。
【００８０】
（シアン現像剤）
２−エチルヘキシルメタクリレート−アクリル酸共重合樹脂（２−エチルヘキシルメタクリレート／アクリル酸（重量比）＝８５／１５、重量平均分子量１３１，０００）を５重量部、Ｍｏｎａｓｕｔｒａｌ Ｂｌｕｅ ＦＧＸ（Ｃ．Ｉ．Ｐｉｇｍｅｎｔ Ｂｌｕｅ１５：４ セネカ製）を５重量部、ナフテン酸ジルコニウム（日本化学産業製）を５重量部からなる組成物を、テトラヒドロフラン１００ｇ中に投入した後、超音波ホモジナイザー（日本精機製作所製 ＵＳ−３００Ｔ）を使用して共重合樹脂を溶解させ、室温で分散させた。次いで、超音波ホモジナイザーの作動下に、アイソパーＧ（エクソン社製）３００ｇを投入した後、ロータリーエバポレータによってテトラヒドロフランを除去し、固形分１．４％の湿式現像剤とした。
【００８１】
次いで、このシアン画像を有する画像転写用静電記録体の画像面に、カラー原画を色分解して得られるマゼンタ情報に基づき、負のイオンパターン（−４０Ｖ）を形成した後、下記のマゼンタ現像剤を有するローラー現像器で現像し、シアン画像とマゼンタ画像を有する画像転写用静電記録体を得た。
【００８２】
（マゼンタ現像剤）
２００ｍｌ丸底フラスコに樹脂として変性エチレン−酢酸ビニル共重合体（変性ＥＶＡ）（武田薬品工業製 デュミラン２２７０）２．７ｇと電荷調整剤ジアルキルスルホコハク酸コバルト６０ｍｇ、さらに溶媒としてテトラヒドロフランを１５０ｍｌ添加した。この溶液を樹脂溶解温度６０〜８０℃で１時間加熱撹拌した。なお、ジアルキルスルホコハク酸コバルトは、ジアルキルスルホコハク酸ナトリウム（和光純薬製、Ａｅｒｏｓｏｌ ＯＴ )と硝酸コバルトを非水溶媒中において反応して製造した。造粒可能な樹脂は変性ＥＶＡが最適で特に接着特性も考慮してデュミラン２２７０を使用した。デュミランシリーズには部分ケン化度を変えたものがあり、いずれも使用可能であった。
【００８３】
別に２００ｍｌビーカに着色剤としてブリリアントカーミン６Ｂ（スミカプリントカーミン６ＢＦ−１、住化カラー製）１．０ｇと分散剤としてポリ−１２−ヒドロキシステアリン酸メチルエステル（伊藤製油製、３量体）６０ｍｇをテトラヒドロフラン１００ｍｌを溶媒として分散した。分散は卓上型超音波ホモジナイザー（日本精機 ＵＨＳ−３００Ｔ）を使用した。この分散液を先に調整されたフラスコ内に一度に投入した。混合撹拌を６０〜８０℃でさらに１時間行い顔料分散液とした。５００ｍｌビーカーに温度１０℃に冷却したアイソパーＧ（エクソン社製）２００ｍｌを用意し、これに先に調整した顔料分散液を超音波ホモジナイザーで分散しながら投入した。これにより樹脂の溶解度を利用した造粒を行った。テトラヒドロフランとアイソパーＧとの溶媒置換はデカンテーションまたは遠心分離操作により、完全にアイソパーＧに置換して湿式現像剤とした。この湿式現像剤をさらにアイソパーＧを使用して印刷濃度１％に調整した。
【００８４】
（被転写体）
コピー用紙（リコー（株）製、ＰＰＣ用紙タイプ６２００）
（転写方法）
上記で得たシアン画像及びマゼンタ画像を有する画像転写用静電記録体の画像面と、上記の被転写体とを重ね合わせ、熱圧ローラ（１６０℃、線圧力２０ｋｇ／ｃｍ、送り速さは２ｍ／分）で加熱圧着した後、被転写体を剥離した。
【００８５】
剥離に際しては、画像転写用静電記録体における離型層と剥離層間できれいに剥離し、また、画像転写用静電記録体における画像はほとんど被転写体に転写した。
【００８６】
（実施例２）
実施例１における画像転写用静電記録体における剥離層を、下記組成の塗液をミヤバー塗布し、１２０℃で１０分の加熱条件下で架橋化させた後、乾燥し、乾燥重量が１ｇ／ｍ² となるように形成したものとした以外は、実施例１同様にして画像転写用静電記録体を作製した。
【００８７】

この画像転写用静電記録体を使用し、実施例１同様に画像形成した後、実施例１で作製した被転写体に、実施例１同様に画像を転写した。
【００８８】
剥離に際しては、画像転写用静電記録体における離型層と剥離層間できれいに剥離し、また、画像転写用静電記録体における画像はほとんど被転写体に転写した。
【００８９】
（比較例１）
実施例１における画像転写用静電記録体における剥離層に代えて、下記の組成物を同様に塗布した以外は、実施例１同様にして画像転写用静電記録体を作製した。
【００９０】
アクリル樹脂（三菱レーヨン社製、Ｂｒ−１０１） ・・ １０重量部
溶剤（メチルエチルケトン） ・・ ４５重量部
溶剤（トルエン） ・・ ４５重量部
この画像転写用静電記録体を使用し、実施例１同様に画像形成した後、実施例１で作製した被転写体に、実施例１同様に画像を転写した。
【００９１】
画像の転写後、被転写体を剥離したが、画像の転写残りが多かった。
【００９２】
【発明の効果】
本発明の画像転写用静電記録体及び画像転写方法は、転写に際して接着層を介在させなくても、画像転写特性に優れるものである。また、特にその画像をイオン流によってイオンパターンを形成し、形成したイオンパターンを着色剤を含有する湿式現像剤によって現像して形成すると、コンピュータ等による電子的に処理された画像情報を種々の基材上に転写して画像を形成することができると共に、時間短縮による生産性の向上も可能で、且つどのような形状の被転写体へも画像転写が可能とするものである。
【００９３】
さらに、画像表現に関しては、グラデーション印刷物に対して従来より細かな階調表現が可能であり高精細印字物が得られる。さらに図柄等をエンドレスに長巻き作製可能であり、生産性も良い。
【図面の簡単な説明】
【図１】 本発明の画像転写用静電記録体の模式断面図である。
【図２】 本発明の画像転写用静電記録体の他の例における模式断面図である。
【図３】 イオン流による画像形成装置の一例を説明するための図である。
【図４】 記録ヘッドの一例を示す斜視図である。
【図５】 記録ヘッドの他の例を示す断面図である。
【符号の説明】
１…画像形成装置、２…記録ヘッド、３…誘電体、４…ライン電極、５…フィンガー電極、６…イオン、７…記録媒体、８…イオン流、９…スクリーン電極、１０…絶縁体、１１…穴、１２…コロトロン放電型ヘッド、１３…金属容器、１４…放電用電極、１５…誘電体、１６…イオン流調整用電極、２０…画像転写用静電記録体、２１…基体シート、２２…離型層、２３…自己架橋性樹脂からなる誘電性剥離層、２４…導電層[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrostatic transfer medium for image transfer and an image transfer method used for transferring an image onto a transfer medium such as cloth, paper, film, and leather.
[0002]
[Prior art]
In order to form a pattern on a material to be transferred such as fabric, paper, film, and synthetic leather, a method of transferring an image formed with a pigment or the like is widely used. Recently, an image is transferred to form a pattern even on a material having irregularities on the surface, for example, a material having a minute hole on the surface, such as natural leather, to meet various demands.
[0003]
For example, as a method for transferring a color pattern, there is a method of transferring using a plurality of plates corresponding to colors. However, enormous time and cost are required for the plate making process. In addition, since various kinds of requests are made for symbols depending on fashion, time, etc., the prior art has a problem in terms of time to respond to these requests immediately.
[0004]
On the other hand, it is possible to transfer an image on a photoconductor onto a desired material by using an electrophotographic method such as an electrophotographic copying machine. There is a problem that a complicated mechanism such as the above is required, and the shape of the transfer object is also restricted by the shape of the photoconductor.
[0005]
As a method for solving such a problem, the present inventors use an ion printer to form an ion pattern on an electrostatic recording material for image transfer, and develop the ion pattern with a wet developer containing a colorant. Then, after preparing an electrostatic recording material for image transfer, a method for transferring an image on the electrostatic recording material for image transfer to a transfer material was developed, and was previously filed as Japanese Patent Application No. 7-268875. With this image transfer method, it is possible to easily produce a gradation image directly and in real-time while observing the necessary colors and designs on a display device such as a CRT display device. It has excellent properties and is suitable for image transfer to a transfer medium such as fabric, paper, film, synthetic leather, etc., but its image transfer characteristics are not sufficient, and it is thermocompression bonded with an adhesive layer interposed. On the other hand, it has been found that there is a problem that heat transfer is liable to occur and the transfer target capable of image transfer is limited. In addition, there is a problem that image transfer characteristics are not sufficient for a transfer target without an adhesive layer.
[0006]
[Problems to be solved by the invention]
The present invention provides an electrostatic transfer medium for image transfer and an image transfer method that are excellent in image transfer characteristics and can perform good image transfer regardless of the type of transfer target, without an adhesive layer during transfer. Is an issue.
[0007]
[Means for Solving the Problems]
The electrostatic recording material for image transfer according to the present invention is provided with a release layer on a base sheet having a conductive layer, and on the release layer, a self-crosslinking resin having a glass transition temperature of -20 ° C to 100 ° C. A dielectric release layer formed by (1) is provided.
[0008]
In addition, the image transfer electrostatic recording body forms an ion pattern by ion flow, and then develops the formed ion pattern with a wet developer containing a colorant to form a transfer image. It is characterized by being.
[0009]
In the image transfer method of the present invention, a release layer and a dielectric release layer formed of a self-crosslinking resin having a glass transition temperature of −20 ° C. to 100 ° C. are sequentially provided on a base sheet having a conductive layer. A transfer image is formed on an electrostatic recording material for image transfer, and then the transfer target is overlapped and thermocompression bonded to transfer the image on the electrostatic transfer material for image transfer onto the transfer target. To do.
[0010]
Further, after the transfer image in the above image transfer method is formed on the electrostatic recording medium for image transfer by ion flow, the formed ion pattern is developed with a wet developer containing a colorant. It is formed.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The electrostatic recording material for image transfer of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram for explaining an example of an electrostatic transfer body for image transfer. 1 has a release layer 22 on one surface of a substrate sheet 21 and a dielectric release layer made of a self-crosslinking acrylic resin having a glass transition temperature of −20 ° C. to 100 ° C. 23 are sequentially stacked, and a conductive layer 24 is provided on the other surface.
[0012]
As the base sheet 21, a material generally used as a base material of a thermal transfer sheet can be used. Specifically, a polyester resin film such as polyethylene terephthalate or polybutylene terephthalate, a polyolefin film such as polyethylene or polypropylene, a synthetic resin film such as a polyamide film such as nylon, paper, or synthetic paper can be used. As the substrate sheet, a plurality of these materials may be formed by laminating a film thickness ^{5g / m 2 ~150g / m 2} , preferably or equal to 30g / m ² ~100g / m ² .
[0013]
The release layer 22 is provided for the purpose of preventing heat fusion with the transfer target after transfer, and for the purpose of improving the peelability at the interface between the release layer and a release layer described later. Thus, it is preferable to be composed of a thermosetting resin, an actinic ray curable resin, a cellulose derivative resin, or the like. Examples of the thermosetting resin include silicone resin, fluororesin, melamine resin, aminoalkyd resin, urea resin, xylene / formaldehyde resin, epoxy resin, phenol resin, furan resin, etc., preferably silicone resin, fluororesin , Melamine resin and amino alkyd resin, more preferably silicone resin.
[0014]
The thermosetting resin layer is composed of aromatic hydrocarbons such as toluene and xylene, ketones such as methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone, esters such as ethyl acetate and methyl acetate, alcohols such as propanol and butanol, etc. After being dissolved in the above solvent, water or a mixed solvent thereof, it is applied by reverse coating, roll coating, gravure coating, kiss coating, blade coating, smooth coating, etc., and then heated and cured.
[0015]
The actinic ray curable resin layer is a resin that is cured by photopolymerization with an actinic ray such as electron beam, visible ray, ultraviolet ray, infrared ray, X-ray, laser beam, etc., and is a polyfunctional acrylate, polyfunctional methacrylate. , Urethane acrylate, urethane methacrylate, polyester acrylate, polyester methacrylate, epoxy acrylate and other monomers, oligomers and the like are photopolymerized in the presence or absence of the following cross-linking agents and photoinitiators.
[0016]
Examples of the crosslinking agent include melamine resins, benzoguanamine resins, methanol-modified melamine resins, amino resins such as urea resins, organic peroxides such as t-butyl hydroperoxide and di-t-butyl peroxide, diethylenetriamine, and tetraethylenepentamine. Examples include aliphatic polyamines, aromatic amines, tertiary amines such as dimethylaminomethylphenol, and imidazoles such as 2-methylimidazole and 2-ethyl-4-methylimidazole. Also, curing accelerators such as organometallic compounds, organosilanes, and metal soaps are used.
[0017]
Examples of the photoinitiator include 2-hydroxy-2-methyl-1-phenylpropan-1-one (“Darocur 1173” manufactured by Merck & Co.), 1-hydroxycyclohexyl phenyl ketone (“Irgacure 184 manufactured by Ciba Geigy) )), 1- (4-Isopropylphenyl) -2-hydroxy-2-methylpropan-1-one ("Darocur 1116" manufactured by Merck), benzylmethyl ketal ("Irgacure 651" manufactured by Ciba Geigy), 2 -Methyl-1- [4- (methylthio) phenyl] -2-morpholinopropanone-1 (“Irgacure 907” manufactured by Ciba Geigy), 2,4-diethylthioxanthone (“Kayacure DETX” manufactured by Nippon Kayaku Co., Ltd.) And ethyl p-dimethylaminobenzoate (“Kayacure EPA” manufactured by Nippon Kayaku Co., Ltd.) , And a mixture of isopropylthioxanthone (“Kuntacure • ITX” manufactured by Ward Brekinsop Co.) and ethyl p-dimethylaminobenzoate, etc., which are liquids such as 2-hydroxy-2-methyl-1-phenylpropane-1 -On is particularly preferable in terms of compatibility with a resin-forming material such as a monomer or oligomer.
[0018]
A composition of 0 to 20 parts by weight of a crosslinking agent and 0 to 20 parts by weight of a photoinitiator with respect to 100 parts by weight of a monomer is an aromatic hydrocarbon such as toluene or xylene, methyl ethyl ketone, methyl isobutyl ketone, After dissolving in ketones such as cyclohexanone, esters such as ethyl acetate and methyl acetate, alcohols such as propanol and butanol, water or mixed solvents thereof, reverse coating, roll coating, gravure coating, kiss coating, After applying by blade coating, smooth coating, etc., it is cured by irradiation with actinic rays.
[0019]
Examples of the cellulose derivative resin include cellulose ethers such as cellulose acetate, methyl cellulose, ethyl cellulose, benzyl cellulose, oxyethyl cellulose, and carboxyethyl cellulose, cellulose esters such as acetyl cellulose and nitrocellulose, and solvents such as toluene and xylene. After dissolving in aromatic hydrocarbons, ketones such as methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, esters such as ethyl acetate and methyl acetate, alcohols such as propanol and butanol, water or a mixed solvent thereof, reverse Apply by coating, roll coating, gravure coating, kiss coating, blade coating, smooth coating, etc. and dry to form There.
[0020]
The film thickness of the release layer 22 after curing, or after drying weight, 0.05 to 10 g / m ^2, preferably 0.2-5 g / m ^2, particularly preferably at 0.5 to 2 g / m ² is there.
[0021]
The dielectric release layer 23 is formed of a self-crosslinking resin having a glass transition temperature of −20 ° C. to 100 ° C. As such a self-crosslinking resin, in an acrylic resin, melamine resin, epoxy resin, etc. having two or more functional groups, the substituents are reactive with each other, such as a hydroxyl group, a carboxyl group, an epoxide group, an amide group. , N-methylolamide group, amino group, isocyanate group, etc., esterification reaction between epoxide group or hydroxyl group and carboxyl group, condensation reaction between carboxyl group or hydroxyl group and N-methylol group That form a cross-linked structure such as 2-hydroxyethyl acrylate, 2-hydroxyisopropyl methacrylate, hydroxyl group-containing monomers such as allyl alcohol, monomers having a carboxyl group such as acrylic acid, methacrylic acid, maleic acid, glycidyl acrylate, allyl Epoxides such as glycidyl ether A monomer having a methylolated amide group such as methylolated acrylamide or alkoxymethylacrylamide, a resin obtained by homo- or copolymerizing a monomer having an amino group such as aminoethyl methacrylate or dimethylaminoethyl methacrylate, or a certain kind of After copolymerization of the reactive monomer, the resulting polymer is chemically treated to form a side chain having the desired functional group, and among these resins, polymerizations referred to as oligomers and prepolymers Resins with a degree of tens to thousands can be mentioned, and applied in the form of water-based emulsion on the release layer by reverse coating, roll coating, gravure coating, kiss coating, blade coating, smooth coating, etc. Room temperature storage, Heat treated, it may be cross-linked.
[0022]
In addition, a composition comprising a resin having a hydroxyl group, a carboxyl group or the like introduced in the structural formula of the resin, and a thermosetting resin such as a metal oxide, urea resin, melamine resin, or urethane resin as a crosslinking agent, Solvents such as aromatic hydrocarbons such as toluene and xylene, ketones such as methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone, esters such as ethyl acetate and methyl acetate, alcohols such as propanol and butanol, etc. It may be formed by coating, gravure coating, kiss coating, blade coating, smooth coating, etc., followed by drying by heating.
[0023]
The heat-crosslinking resin is classified into a self-crosslinking resin that forms a network structure by its own reaction and a crosslinking agent reaction type resin that forms a network structure in the presence of a crosslinking agent. Among these, the self-crosslinking resin can form a network structure without impairing the flexibility of the film because there is no problem of coating curing due to the self-curing body of the crosslinking agent alone found in the crosslinking agent-reactive resin. Is preferred.
[0024]
As such a self-crosslinking resin, an acrylic monomer comprising a carboxyl group, an epoxide group, an acrylic monomer having a carboxyl group or an epoxide group, a methacrylic monomer, an acrylic monomer having a methylolated amide group, or an alkyl ether group thereof, and the like. Resin. Moreover, as such a self-crosslinking resin, you may use what is marketed, for example, SEK-301 (glass transition temperature 18 degreeC) by Nippon Pure Chemical Industries, Ltd., SEK-410 (glass transition temperature). 44 ° C).
[0025]
The coating amount of the dielectric release layer, 0.1 to 20 g / m ² in dry weight, preferably from 0.2 to 10 g / m ^2, particularly preferably 0.5 to 2.0 g / m ^2. When the coating amount exceeds 20 g / m ² , the original surface characteristics are impaired when transferred onto the transfer medium, which is not preferable.
[0026]
When an organic solvent-based coating solution is used as the release layer 22 described above, a water-based resin that can be applied without damaging the coating layer surface of the release layer is preferably used as the release layer 23. It is preferable to use an emulsion-based cross-linked resin as described above, and this can also provide excellent electrostatic recording properties.
[0027]
That is, the dielectric release layer is the outermost layer of the electrostatic transfer body for image transfer, and has an electric resistance value defined by ASTM D257 from the viewpoint of charging characteristics as an electrostatic recording layer, and 1 × 10 ^12. Ω · cm to 1 × 10 ¹⁷ Ω · cm (humidity 65%, 25 ° C.). For this purpose, it is not preferable to add a dispersant, a crosslinking initiator or the like in the coating solution for forming the release layer from the viewpoint of development characteristics and moisture resistance, and it is used in the form of so-called “so-press emulsion”. Good.
[0028]
The release layer in the present invention is preferably a self-crosslinkable resin having an appropriate glass transition temperature characteristic and excellent coating characteristics and charging characteristics from the viewpoint of satisfying each function of the dielectric layer, release layer, and adhesive layer. In view of the size, self-crosslinking acrylic resin is particularly preferable. In addition, it can be an excellent outermost layer on the transferred object when transferred to the transferred object together with the image, and can be in close contact with the transferred object without using an adhesive layer when transferring the image to the transferred object. It can be excellent in properties. Moreover, it is excellent in film formability and excellent in coating film strength.
[0029]
The surface of the dielectric release layer 23 is preferably matted. Thereby, even if it attracts | sucks to a slit at the time of slit development, a motion of the electrostatic recording body for image transfer is not prevented. For this purpose, the inorganic or organic fine particles are dispersed in the above-described release layer forming coating solution, and then formed by coating. Fine particles include inorganic fine particles such as silica, titanium oxide, calcium carbonate, talc, kaolinite and mica, acrylonitrile polymer, polymer of acrylate ester, polymer particle of hydrophobic resin such as polystyrene, polyacrylic acid, polyacrylamide, polyamide And polymer particles of hydrophilic resins such as polyvinyl alcohol and gelatin, or finely pulverized products and emulsions of these resins.
[0030]
The fine particles have an average particle diameter of 100 μm to 10 μm, preferably 500 nm to 5 μm, more preferably 700 nm to 3 μm, and a ratio of 1 to 500 parts by weight, preferably 10 to 200 parts by weight, with respect to 100 parts by weight of the resin. If the amount exceeds 500 parts by weight, problems such as image fogging tend to occur.
[0031]
The coating amount of the mat layer is, 0.1 to 10 g / m ² in dry weight, preferably from 0.5 to 5 g / m ^2, particularly preferably 1 to 2 g / m ^2. If the coating amount exceeds 10 g / m ² , the gradation characteristics in the developed gradation image tend to deteriorate, which is not preferable.
[0032]
Further, the functions of the matting layer and the release layer may be integrated, and the matting release layer may be used instead of the release layer and the matting layer. The matting release layer may be formed in the same manner as the release layer by mixing the above-described fine particles with the material used for forming the release layer. The coating amount of the matte release layer is the same as that of the release layer.
[0033]
Further, instead of providing the matting layer, a base sheet having an uneven surface may be used, or the release layer 22 may be mixed with fine particles for matting. Further, an uneven surface may be formed by providing a matting layer in which the above fine particles are dispersed in the binder in the same manner as described above between the base sheet and the release layer. The binder in the matting layer includes acrylic resin, methacrylic acid ester resin, butyral resin, silicone resin, styrene resin, acrylonitrile resin, polycarbonate resin and other synthetic resins, polyacrylic acid, polyacrylamide, polyamide, polyvinyl alcohol. Examples include hydrophilic resins such as gelatin, thermosetting resins such as phenol resins, furan resins, xylene / formaldehyde resins, epoxy resins and melamine resins, and mixtures and copolymers of these resins can also be used. is there. Further, instead of adding fine particles as a matting means, a concavo-convex surface may be formed by pressing a plate with irregularities on the surface against the surface of a layer that requires matting.
[0034]
The degree of unevenness on the uneven surface described above varies depending on the type of the developing device and the like, but the surface smoothness is about 10 to 1000 seconds as Beckman smoothness, and the surface roughness Rz (10-point average roughness JIS-B06010) is It is good to set it as 100 nm-10 micrometers.
[0035]
Further, for the purpose of further improving the image transferability, an adhesive layer may be formed in advance on the surface of the release layer as needed before forming an image. However, such an adhesive layer does not exhibit adhesive or adhesive properties during storage or image formation, and must exhibit adhesiveness or adhesiveness only when it is thermocompression-bonded to a transfer target. In addition, it is necessary that the electrostatic recording layer has the above-described surface resistance value. In addition, the adhesive layer may be provided on the surface of the transfer medium described later, instead of being provided on the surface of the image transfer electrostatic recording body.
[0036]
Examples of the adhesive layer include synthetic rubber such as styrene butadiene rubber, acrylic resin, methacrylic resin, polyvinyl ether resin, vinyl acetate resin, vinyl chloride resin, vinyl chloride-vinyl acetate copolymer resin, styrene resin, polyester. A thermoplastic resin such as a resin, a polyamide resin, or a polyvinyl butyral resin is dissolved in a solvent to form a coating.
[0037]
The coating amount of the adhesive ^{layer, 1g / m 2 ~30g / m} 2 in dry weight, preferably from ^{2g / m 2 ~15g / m 2} , particularly preferably ^{2g / m 2 ~10g / m 2} . When the coating amount exceeds 30 g / m ² , the original surface characteristics are impaired when transferred to a transfer medium, which is not preferable. In addition, it is possible to prevent an object to be transferred from being peeled off from the periphery after forming an adhesion strengthening layer having a high adhesive strength around the adhesive layer and transferring it to the object to be transferred. As the adhesion strengthening layer, it is preferable to use a material having excellent adhesive strength in the above-mentioned adhesive layer material. In the case where alteration or deterioration of the image due to the adhesive layer occurs, the adhesive layer may not be provided on the entire surface, and may be formed only around the area where the image is not formed. Deterioration and the like can be prevented.
[0038]
The conductive layer 24 provided on the opposite surface of the substrate sheet is made of an ion conductive or electronic conductive material, for example, a cationic polymer electrolyte such as polyvinylbenzyltrimethylammonium chloride, or an anionic polymer electrolyte. Further, it is preferable to form a surfactant, conductive fine particles of metal or metal oxide by mixing with a polymer binder and applying the mixture onto a substrate sheet. The above material may be formed on the substrate sheet by vacuum deposition or sputtering. The surface resistance of the conductive layer is preferably 10 ¹¹ Ω or less. If it is larger than 10 ¹¹ Ω, the ion pattern is disturbed or fogging occurs due to the peeling discharge, which causes a problem in image quality. As an example of the combination of the base sheet 21 and the conductive layer 24, electrostatic recording paper produced by forming a dielectric layer on conductive paper may be used.
[0039]
Next, when a synthetic resin film is used as a base sheet, the film thickness is thick from the viewpoint of supportability. However, it acts as a dielectric when forming an image based on an ion image, and a high voltage is applied to the base sheet. Becomes charged and causes discharge. It is preferable to dispose the conductive layer on the side of the base sheet that forms the ion image.
[0040]
Such an electrostatic transfer body for image transfer is shown in FIG. In the figure, the same reference numerals as those in FIG. 1 denote the same contents. This electrostatic recording medium for image transfer has a structure in which a base sheet 21, a conductive layer 24, a release layer 22, and a dielectric release layer 23 made of a self-crosslinking resin are sequentially provided. The conductive layer 24 may be formed in the same manner as that shown in FIG. Further, the release layer surface may be a matted surface as shown in FIG. 1, and the release layer and the base sheet surface may be matted. A reinforcing layer may be provided.
[0041]
Moreover, instead of the combination of the base sheet 21 and the conductive layer 24 in FIG. 2, the base sheet itself may be conductive, for example, conductive paper. Examples of conductive paper include inorganic salts such as sodium chloride, cationic polymer electrolytes such as polyvinylbenzyltrimethylammonium chloride, anionic polymer electrolytes, surfactants, zinc oxide, or conductive metal such as zinc oxide Examples thereof include paper impregnated or coated with an oxide semiconductor and having a surface resistance of 10 ⁵ to 10 ¹¹ Ω.
[0042]
The image forming surface of the above-described electrostatic transfer body for image transfer according to the present invention has an electrical resistance value defined by ASTM D257 from the viewpoint of recordability of an electrostatic latent image, as shown in FIG. 10 ¹² Ω · cm to 1 × 10 ¹⁷ Ω · cm (humidity 65%, 25 ° C.).
[0043]
Next, an image forming method on the electrostatic transfer material for image transfer according to the present invention will be described. As an image forming method, it is preferable that an ion pattern is formed by an ion flow, and the formed ion pattern is developed with a wet developer containing a colorant to form an image for transfer.
[0044]
An example of an ion pattern image forming apparatus is shown in FIG. The ion pattern image forming apparatus 1 has a recording head 2 that performs irradiation of an ion current, and a peripheral portion of the finger electrode by a high-frequency voltage applied between the line electrode 4 and the finger electrode 5 stacked via a dielectric 3. Discharge is generated, positive and negative ions 6 are generated, and an ion current 8 is formed by an electric field formed between the finger electrode 5 and the electrostatic recording body (recording body) 7 for image transfer, and static electricity due to ions is formed on the recording body. An electric image is formed, and a voltage is applied to the screen electrode 9 in order to isolate the finger electrode from the electrostatic image formed on the recording medium.
[0045]
FIG. 4 is a perspective view showing an example of a recording head. The screen electrode 9 is laminated via the line electrode 4, the finger electrode 5, and the insulator 10, and an ion flow flows through a hole 11 formed in the screen electrode. This shows a solid discharge head. The recording head has a built-in driver circuit for applying a voltage for controlling the ion flow to each hole in the finger electrode. This driver circuit can apply ion flow passage voltage pulses to each ion flow passage hole with a pulse width of 256 steps, thereby realizing gradation control of 256 steps for each dot.
[0046]
In addition to this, the corotron discharge head shown in FIG. 5 can also be used for image recording by ion flow. The corotron discharge type head 12 generates ions by the discharge electrode 14 provided in the metal container 13, and the ion current is adjusted according to the image to be formed by the ion flow adjusting electrodes 16 provided on both surfaces of the dielectric 15. 8 is adjusted.
[0047]
In this recording method, the ion flow is controlled by forming a charge pattern on the recording medium by controlling the electric field of ions generated by the discharge. The ion flow is applied between the electrode plates for controlling the ion flow. By controlling the voltage to control the voltage or the pulse width control to control the time of the voltage pulse applied between the electrode plates, it is possible to control the gradation for each dot. It is possible to form a gradation image that cannot be obtained by the method of forming an image by means. Therefore, the recorded dots are modulated for each dot in a halftone print, and the gradation density control and gradation reproduction ability to control the volume gradation and area gradation for each dot at the same time enable subtle reproduction of edges and the like. And increase the effective resolution. As a result, the dot size can be changed in a short time of several microseconds, so that halftone dot gravure gradation can be expressed. In addition to these, the fact that the dots maintain a sharp shape at the edge of the line drawing without the influence of the history is further advantageous compared to the thermal sublimation recording method in which tailing or the like tends to occur due to the influence of the thermal history. Is a point.
[0048]
It is possible to form an electrostatic pattern without using a mask pattern by using an electrostatic plotter or the like. However, in this case, generally, a binary image is obtained and gradation expression is limited. Further, there is a problem that the gradation or resolution is also limited because the gradation is expressed by performing gradation processing other than binary processing by removing the restriction on the printing speed, and the pseudo gradation expression.
[0049]
In addition to the ability to control the gradation for each recording dot, the image recording method using the ion flow does not have to worry about an increase in running costs due to a large consumption of ink film as in the thermal sublimation recording method. It is a recording method that can be provided with high image quality and at low cost, and enables image information electronically processed by a computer or the like to be transferred onto various substrates to form an image.
[0050]
Furthermore, as a recording method for the image transfer electrostatic recording material of the present invention, in addition to the method of forming an ion pattern by ion flow, for example, an electrophotographic method may be adopted. In this case, even if recording is performed by controlling the size of the electrostatic latent image and the amount of charge for each pixel by controlling the recording light intensity and the irradiation time for the irradiation amount of the recording light (for example, laser light), gradation representation is possible. Is possible. The electrostatic recording material for image transfer according to the present invention can also be used in an image forming method using an electrostatic printer using a multi-stylus head.
[0051]
Next, a developing method for producing the electrostatic transfer body for image transfer of the present invention will be described. As a developing method, a wet developer can be used and a roller developing method or a slit developing method can be used. In color development, three colors of C, M, Y or C, M, Y, and Bk are used. Alternatively, a color image can be formed by repeatedly forming and developing four-color ion images.
[0052]
The wet developer is a dispersion of a colorant, a fixing resin, and a charge control agent in an electrically insulating liquid, and a dispersion stabilizer, a charging property improving resin, a color overlay improver, etc. are added as necessary. It consists of things.
[0053]
As the colorant, known organic or inorganic pigments or sublimation dyes can be used.
The pigment will be described. Examples of black pigments include inorganic carbon black, triiron tetroxide, and organic cyanine black.
[0054]
Examples of yellow pigments include inorganic yellow lead, cadmium yellow, yellow iron oxide, titanium yellow, ocher and the like. Further, acetoacetanilide monoazo pigments of hardly soluble metal salts (azo lakes) include Hansa Yellow G (CINo. Pigment Yellow 1, hereinafter the same), Hansa Yellow 10G (Pigment Yellow 3), Hansa Yellow RN (Pigment Yellow 65). ), Hansa Brilliant Yellow 5GX (Pigment Yellow 74), Hansa Brilliant Yellow 10GX (Pigment Yellow 98), Permanent Yellow FGL (Pigment Yellow 97), Shimura Lake Fast Yellow 6G (Pigment Yellow 133), Lionol Yellow K-2R (Pigment Yellow) 169), and acetoacetic acid anilide disazo pigments include disazo yellow G (Pigment Yellow 12), disazo yellow GR (Pigment Yellow 13), disazo yellow 5G (Pigment Yellow 14), disazo yellow 8G (Pigment Yellow 17), Suazoiero R (Pigment Yellow 55), include Permanent Yellow HR (Pigment Yellow 83).
[0055]
Examples of the condensed azo pigments include chromophthal yellow 3G (Pigment Yellow 93), chromophthal yellow 6G (Pigment Yellow 94), and chromophthal yellow GR (Pigment Yellow 95). Further, benzimidazolone monoazo pigments include Hosta Palm Yellow H3G (Pigment Yellow 154), Hosta Palm Yellow H4G (Pigment Yellow 151), Hosta Palm Yellow H2G (Pigment Yellow 120), Hosta Palm Yellow H6G (Pigment Yellow 175). And Hosta Palm Yellow HLR (Pigment Yellow 156). Examples of isoindolinone pigments include Irgazine Yellow 3RLTN (Pigment Yellow 110), Irgazine Yellow 2RLT, Irgazine Yellow 2GLT (Pigment Yellow 109), Fastgen Super Yellow GROH (Pigment Yellow 137), Fastogen Super Yellow. Examples include GRO (Pigment Yellow 110) and Sandrin Yellow 6GL (Pigment Yellow 173). In addition, flanetron (Pigment Yellow 24) which is a selenium pigment, anthra myrimidine (Pigment Yellow 108), phthaloylamide type anthraquinone (Pigment Yellow) 123), Heliofast Yellow E3R (Pigment Yellow 99), Azo-type nickel complex pigment (Pigment Green 10) which is a metal complex pigment, Nitroso-type nickel complex pigment (Pigment Yellow 153), Azomethine-type copper complex Pigment (Pigment Yellow 117), phthalimide quinophthalone pigment (Pigment Yellow 138), and the like is further quinophthalone pigments.
[0056]
Examples of magenta pigments include inorganic cadmium red, bengara, silver vermilion, red lead, and antimony vermilion. Examples of the azo lake azo lake pigment include Brilliant Carmine 6B (Pigment Red 57: 1), Lake Red (Pigment Red 53: 1), Permanent Red F5R (Pigment Red 48), Resol Red (Pigment Red 49), and Persian Orange (Pigment Orange 17). ), Black Orange (Pigment Orange 18), Helio Orange TD (Pigment Orange 19), Pigment Scarlet (Pigment Red 60: 1), Brilliant Scarlet G (Pigment 64: 1), Helio Red RMT (Pigment Red 51), Bordeaux 10B (Pigment Red 63) ), Helio Bordeaux BL (Pigment Red 54), and insoluble azo compounds (monoazo, disazo, condensed azo compounds) include para red (Pigment Red 1), lake red 4R (Pigment Red 3), and permanent orange (Pigment Orange 5). ) Permanent Red FR2 (Pigment Red2), Permanent Red FRLL (Pigment Red9), Permanent Red FGR (Pigment Red112), Brilliant Carmine BS (Pigment Red114), Permanent Carmine FB (Pigment Red5), P. V. Carmine HR (Pigment Red 150), Permanent Carmine FBB (Pigment Red 146), Nova Palm Red F3RK-F5RK (Pigment Red 170), Nova Palm Red HFG (Pigment Orange 38), Nova Palm Red HF4B (Pigment Red 187), Nova Palm Orange HL. HL-70 (Pigment Orange 36), P.I. V. Carmin HF4C (Pigment Red 185), Hosta balm brown HFR (Pigment Brown 25), Vulcan orange (Pigment Orange 16), Pyrazolone orange (Pigment Orange 13), Pyrazolone red (pigment Red 38), and as a condensed azo pigment, Kromov Examples include Tar Orange 4R (Pigment Orange 31), Chromophthal Scarlet R (Pigment Red 166), and Chromophthal Red BR (Pigment Red 144).
[0057]
Examples of anthraquinone pigments that are condensed polycyclic pigments include pyranthrone orange (Pigment Orange 40), anthanthrone orange (Pigment Orange 168), and dianthraquinonyl red (Pigment Red 177), and thioindigo magenta (Pigment Violet 38). ), Thioindigo violet (Pigment Violet 36), thioindigo red (Pigment Red 88), perinone orange (Pigment Orange 43) as a perinone pigment, and perylene red (Pigment Red 190) as a perylene pigment. Examples include perylene vermilion (Pigment Red 123), perylene maroon (Pigment Red 179), perylene scarlet (Pigment Red 149), and perylene red (Pigment Red 178), and quinacridone as a quinacridone pigment. Examples include red (Pigment Violet 19), quinacridone magenta (Pigment Red122), quinacridone maroon (Pigment Red206), quinacridone scarlet (Pigment Red207), and other condensed polycyclic pigments such as pyrocholine pigments, red fluorvin pigments, and dyed lake systems. Pigment (water-soluble dye + precipitating agent → rake fixing) can be mentioned.
[0058]
Examples of cyan pigments include inorganic ultramarine blue, bituminous blue, cobalt blue, and cerulean blue, and phthalocyanine-based pigments include First Gembl-BB (Pigment Blue 15) and Sumiton Cyanine Blue HB (Pigment Blue 15). , Cyanine Blue 5020 (Pigment Blue 15: 1), Sumika Print Cyanine Blue GN-O (Pigment Blue 15), Fast Sky Blue A-612 (Pigment Blue 17), Cyanine Green GB (Pigment Green 7), Cyanine Green S537-2Y (Pigment Green 36), Sumiton Fast Violet RL (Pigment Violet 23), and indanthrone blue (PB-60P, PB-22, PB-21, PB-64), which is a selenium pigment, Methyl violet phosphorus, a basic dye lake pigment Molybdate lake (PV-3), and the like.
In addition, a colorant called a so-called processed pigment in which the surface of the pigment is coated with a resin can be used in the same manner.
Further, instead of the pigment, a dye which diffuses, melts or sublimates by heat and moves from the image transfer recording material to the cloth may be used, and as such a dye, a disperse dye is particularly preferably used, and is about 150 to 550. The molecular weight is selected in consideration of sublimation or melting temperature, hue, light resistance, solubility in resin, developer, and the like.
[0059]
For example, diarylmethane, triarylmethane, thiazole, methine, azomethine, xanthine, oxazine, azo and azo derivatives, anthraquinone derivatives, quinophthalone derivatives, spirodipyrans, isorinospiropyrans, fluorans, rhodamine lactams Dyes of the type are preferably used.
[0060]
Specifically, the C.I. I. Disperse yellow 51, 3, 54, 79, 60, 23, 7, 141, C.I. I. Disperse Blue 24, 56, 14, 301, 334, 165, 19, 72, 87, 287, 154, 26, 359 C.I. I. Disperse thread 135, 146, 59, 1, 73, 60, 167 C.I. I. Disperse violet 4, 13, 26, 36, 56, 31 C.I. I. Solvent Violet 13 C.I. I. Solvent Black 3C. I. Solvent Green 3 C.I. I. Solvent Yellow 56, 14, 16, 29, 105 C.I. I. Solvent Blue 70, 35, 63, 36, 50, 49, 111, 105, 97, 11C. I. Solvent red 135, 81, 18, 25, 19, 23, 24, 143, 146, 182 and the like are exemplified.
[0061]
In addition, 3,3-diethyloxacyanine iodide, Astrazone Pink FG (manufactured by Bayer, CI 48015), 2,2-carbocyanine (C.I. 808), astraphiloxin FF (C.I. I.148070), Astrazone Yellow 7GLL (C.I. Basic Yellow 21), Eisencarotene Yellow 3GLH (Hodogaya Chemical, C.I.48055), Eisencarotene Red 6BH (C.I.48020), etc. Monomethine, dimethine or trimethine methine (cyanine) basic dyes, diphenylmethane basic dyes such as auramine (C.I.655), malachite green (C.I.42000), brilliant green (C I.42040), magenta (C.I. 42510), methyl bai Triphenylmethane-based basic dyes such as Rett (C.I. 42535), Crystal Violet (C.I. 42555), Methyl Green (C.I.684), Victorial Blue B (C.I. 44045), Xanthene basic dyes such as pyronin G (C.I. 739), rhodamine B (C.I. 45170), rhodamine 6G (C.I. 45160), acridine yellow G (C.I. 785), Leonin AL (CI.46075), benzoflavin (C.I.791), affine basic dyes such as affine (C.I.46045), neutral red (C.I.50040), Astrazone Blue BGE / X125 % (C.I. 51005), quinoneimine basic dyes such as methylene blue (C.I. 52015), etc. Basic dyes such as anthraquinone basic dyes having amine.
[0062]
These dyes can be used as they are or in a form in which these dyes are alkali-treated, and counterion exchangers or leuco bodies of these dyes can also be used. When using a leuco dye that is normally colorless or light in color, a developer may be included on the electrostatic recording material side.
[0063]
Further, these disperse dyes are not used alone, but are used even when two or more kinds are mixed. In particular, when mixed and melted, the thermal behavior varies greatly depending on what kind of mixture the two form, and the vapor pressure also varies with the composition ratio. When it occurs, the activation energy is small and the sublimation sensitivity can be improved.
The content of the colorant in the wet developer is 0.1% by weight to 5% by weight.
[0064]
The fixing resin is selected in consideration of a combination of an electrically insulating liquid, a colorant, a charge control agent, a dispersion stabilizer, etc., which will be described later, and after developing the ion pattern, the colorant is fixed on the recording medium. Anything that can be held is acceptable. Specifically, acrylic resins, styrene resins, ethylene resins, vinyl resins, rubber resins, etc., rubbers, or copolymers thereof can be used alone or in combination. When pressure bonding, if yellowing or alteration is not visually confirmed, it can be used. In particular, a polymer or copolymer such as an ethylene-vinyl acetate copolymer (EVA), a partially saponified product thereof, a carboxylated modified product, or an esterified product such as acrylic acid or methacrylic acid can be used.
The content of the fixing resin in the wet developer is 0.02 wt% to 5 wt%.
[0065]
As the charge control agent, any charge control agent that decomposes under the thermal transfer conditions and does not harm the human body can be used. For example, metal salts of dialkylsulfosuccinic acid, manganese naphthenate, calcium naphthenate, zirconium naphthenate, cobalt naphthenate, iron naphthenate, lead naphthenate, nickel naphthenate, chromium naphthenate, zinc naphthenate, magnesium naphthenate, octylic acid Manganese, calcium octylate, zirconium octylate, iron octylate, lead octylate, cobalt octylate, chromium octylate, zinc octylate, magnesium octylate, manganese dodecylate, calcium dodecylate, zirconium dodecylate, iron dodecylate, Metal soap such as lead dodecylate, cobalt dodecylate, nickel dodecylate, chromium dodecylate, zinc dodecylate, magnesium dodecylate, calcium dodecylbenzenesulfonate, dodecylbenzenesulfate Sodium phosphate, alkylbenzenesulfonate salts such as barium dodecylbenzenesulfonic acid, lecithin, phospholipids such as Seharin, and organic amines such as n- decylamine and the like. Preferred are metal salts of naphthenic acid and octylic acid, and particularly preferred is zirconium naphthenate.
The content of the charge control agent added to the wet developer is influenced by the material to be added, but is 0.001 to 2% by weight in the wet developer.
[0066]
As the electrically insulating liquid, a hydrocarbon-based highly insulating liquid can be used, and examples thereof include n-paraffinic hydrocarbons, iso-paraffinic hydrocarbons, mixtures thereof, and halogenated aliphatic hydrocarbons. Particularly preferred are branched chain aliphatic hydrocarbons. For example, Isopar G, Isopar H, Isopar K, Isopar L, Isopar M, Isopar V and the like manufactured by Exxon are preferably used. These liquid aliphatic hydrocarbons are electrically insulating liquids, have a volume resistance of 10 ¹⁰ Ω · cm or more, and are used for the purpose of enhancing electrical insulation in wet developers. Further, it is required that the dissolving power with respect to the wet developer component is relatively small, thereby preventing deterioration.
[0067]
Next, a transfer method to a transfer medium using the image transfer electrostatic recording medium of the present invention will be described.
Suitable materials for transferring an image using the electrostatic transfer material for image transfer of the present invention include cloth, paper, synthetic resin film, leather, etc., but sublimation dyes are used as a colorant. In this case, a material excellent in colorability, for example, a polyester cloth, coated paper, a synthetic resin film, and leather is preferable.
[0068]
In the transfer, the method of thermocompression bonding is preferably performed using a heat roll, and the conditions can be appropriately set according to the characteristics of the electrostatic recording medium for image transfer and the transfer target. In the range of 100 to 200 ° C., preferably 120 to 180 ° C., the linear pressure is 3 to 30 kg / cm, preferably 5 to 15 kg / cm, and the feed speed of the hot roll is 20 m / min or less, preferably 5 to 5 kg. 15m / min is recommended. When the transfer temperature is lower than 100 ° C., sufficient adhesion between the transfer target and the image forming surface of the electrostatic transfer image transfer body cannot be obtained, and uniform transfer cannot be performed. On the other hand, when the temperature exceeds 200 ° C., deformation or alteration of the image transfer electrostatic recording material or the transfer material occurs.
[0069]
Further, in the above-described electrostatic transfer body for image transfer, it is preferable that the transfer body is in close contact, but if necessary, an adhesive layer is provided on the surface of the transfer body or an electrostatic image transfer image is provided. After the image is formed on the recording material, an adhesive layer may be provided on the image. After the adhesive layer is provided, the image may be transferred to the transfer target by using the same transfer method as described above. Good.
[0070]
The adhesive layer provided on the surface of the transfer body is a thermoplastic resin that can transfer the image to the transfer body well, and isoprene rubber, isobutyl rubber, styrene butadiene rubber, butadiene acrylonitrile rubber, etc. Examples include rubber, acrylic resin, methacrylic resin, polyvinyl ether resin, vinyl acetate resin, vinyl chloride resin, vinyl chloride-vinyl acetate copolymer resin, styrene resin, polyester resin, polyamide resin, polyvinyl butyral resin, etc. The colored image formed on the electrostatic recording material for image transfer is mixed with an organic solvent that does not destroy the coating, or is applied and formed in the form of an aqueous emulsion.
[0071]
The thickness of the adhesive layer, on a dry weight was ^{1g / m 2 ~30g / m 2} , preferably from 3 to 15 g / m ^2. If the thickness of the adhesive layer is 1 g / m ² or less, sufficient adhesive strength cannot be obtained. If it exceeds 30 g / m ² , the properties of the original surface of the transferred body will be impaired.
[0072]
After the image is transferred, the image-transfer electrostatic recording material is peeled off from the release layer and the release layer to obtain a transfer-receiving material to which the image is transferred. In the present invention, the image transfer characteristics are sufficient, and an excellent transfer method that does not cause thermal fusion can be achieved regardless of the type of transfer target. In addition, in the case of transfer, in the case of thermal transfer in the hot roll process, if the adhesive strength of the image to the transfer target is not sufficient, the transfer target after peeling is hot-pressed using a heating plate to increase the adhesive strength. Good.
[0073]
In the above, the image recorded on the image transfer electrostatic recording medium is directly transferred to a transfer medium such as cloth, paper, synthetic resin film, leather, etc., but the electrostatic recording recorded on the image transfer electrostatic recording medium is performed. After the latent image is transferred to a secondary transfer body such as electrostatic recording paper, the latent image on the secondary transfer body is developed, and then the intended cloth, paper, and synthetic resin film are used using the secondary transfer body. The image may be transferred to leather or the like.
In addition, once the image obtained by developing the latent image formed on the image transfer electrostatic recording body is transferred to a secondary transfer body such as transfer paper, a cloth intended for the image on the secondary transfer body, You may transfer to paper, a synthetic resin film, leather, etc.
Hereinafter, the present invention will be described in further detail with reference to examples.
[0074]
【Example】
Example 1
(Preparation of electrostatic recording material for image transfer)
A gravure coater is used on the surface of high-quality paper with a basis weight of 55 g / m ^{2 so} that the coating amount after drying a quaternary ammonium-containing conductive resin (Semiyo Kasei Chemistat 6300H) is 3 g / m ^2. Then, it was applied by a gravure reverse method, and applied to the back surface so that the coating amount after drying was 2 g / m ² , thereby producing conductive paper.
[0075]
Next, a solution having the following composition was applied to the recording surface of the obtained conductive recording paper by applying a Miya bar so that the dry weight would be 1 g / m ^2, and then heated at 120 ° C. to release the cured resin. Formed.
[0076]

Furthermore, on the obtained release layer, a solution having the following composition was coated with a Miyabar so that the dry weight was 1 g / m ² , crosslinked at 120 ° C. for 10 minutes, and then dried. Then, a release layer was formed to produce an electrostatic recording material for image transfer of the present invention.
[0077]

(Image forming method and developing method)
Based on the cyan information obtained by color-separating the original color image using the ion current irradiation recording apparatus shown in FIG. 3 for the image transfer electrostatic recording body obtained above, a negative ion pattern (−40 V) is obtained. ) Was formed.
[0078]
The recording head in this ion flow irradiation recording apparatus has 1728 ion flow passage holes, and enables recording of A4 width at a recording density of 200 DPI.
[0079]
The electrostatic recording body for image transfer formed with this ion pattern was developed with a roller developer having the following cyan developer to obtain an electrostatic recording body for image transfer having a cyan image.
[0080]
(Cyan developer)
2-ethylhexyl methacrylate-acrylic acid copolymer resin (2-ethylhexyl methacrylate / acrylic acid (weight ratio) = 85/15, weight average molecular weight 131,000), 5 parts by weight, Monaural Blue FGX (CI Pigment Blue 15: 4) A composition comprising 5 parts by weight of Seneca) and 5 parts by weight of zirconium naphthenate (manufactured by Nippon Kagaku Sangyo) was added to 100 g of tetrahydrofuran, and then an ultrasonic homogenizer (US-300T, manufactured by Nippon Seiki Seisakusho) was used. Then, the copolymer resin was dissolved and dispersed at room temperature. Next, under the operation of an ultrasonic homogenizer, 300 g of Isopar G (manufactured by Exxon) was added, and then tetrahydrofuran was removed by a rotary evaporator to obtain a wet developer having a solid content of 1.4%.
[0081]
Next, a negative ion pattern (−40 V) is formed on the image surface of the electrostatic transfer material for image transfer having the cyan image on the basis of magenta information obtained by color separation of the color original image, and the following magenta development is performed. The image was developed with a roller developing device having an agent to obtain an electrostatic recording material for image transfer having a cyan image and a magenta image.
[0082]
(Magenta developer)
To a 200 ml round bottom flask was added 2.7 g of a modified ethylene-vinyl acetate copolymer (modified EVA) (Dumilan 2270 manufactured by Takeda Pharmaceutical Co., Ltd.), 60 mg of a charge adjusting agent cobalt dialkylsulfosuccinate, and 150 ml of tetrahydrofuran as a solvent. This solution was heated and stirred at a resin dissolution temperature of 60 to 80 ° C. for 1 hour. The cobalt dialkylsulfosuccinate was produced by reacting sodium dialkylsulfosuccinate (Aerosol OT, manufactured by Wako Pure Chemical Industries, Ltd.) and cobalt nitrate in a non-aqueous solvent. The resin that can be granulated is modified EVA, and Dumilan 2270 is used in consideration of the adhesive property. Some of the Dumiran series had different saponification degrees and could be used.
[0083]
Separately, brilliant carmine 6B (Sumika Print Carmine 6BF-1, manufactured by Sumika Color Co., Ltd.) 1.0 g as a colorant and 60 mg poly-12-hydroxystearic acid methyl ester (manufactured by Ito Oil Co., Ltd.) as a dispersant are added to a 200 ml beaker. 100 ml of tetrahydrofuran was dispersed as a solvent. For dispersion, a desktop ultrasonic homogenizer (Nippon Seiki UHS-300T) was used. This dispersion was charged at once into the previously prepared flask. Mixing and stirring were further performed at 60 to 80 ° C. for 1 hour to obtain a pigment dispersion. 200 ml of Isopar G (manufactured by Exxon) cooled to a temperature of 10 ° C. was prepared in a 500 ml beaker, and the previously prepared pigment dispersion was added while being dispersed with an ultrasonic homogenizer. Thus, granulation was performed using the solubility of the resin. The solvent substitution between tetrahydrofuran and Isopar G was completely replaced with Isopar G by decantation or centrifugal separation to obtain a wet developer. The wet developer was further adjusted to a printing density of 1% using Isopar G.
[0084]
(Transfer)
Copy paper (Ricoh Co., Ltd., PPC paper type 6200)
(Transfer method)
The image surface of the electrostatic transfer material for image transfer having the cyan image and the magenta image obtained above and the above-mentioned transferred material are superposed on each other, and a hot pressure roller (160 ° C., linear pressure 20 kg / cm, feed speed is 2 m / min), and then the material to be transferred was peeled off.
[0085]
In peeling, the image was peeled cleanly between the release layer and the peeling layer in the image transfer electrostatic recording body, and the image on the image transfer electrostatic recording body was almost transferred to the transfer target.
[0086]
(Example 2)
The release layer of the image transfer electrostatic recording material in Example 1 was coated with a coating liquid having the following composition, crosslinked at 120 ° C. under a heating condition of 10 minutes, and then dried. An electrostatic recording material for image transfer was produced in the same manner as in Example 1 except that the film was formed so as to have m ² .
[0087]

Using this electrostatic transfer material for image transfer, an image was formed in the same manner as in Example 1, and then the image was transferred to the transfer material produced in Example 1 as in Example 1.
[0088]
In peeling, the image was peeled cleanly between the release layer and the peeling layer in the image transfer electrostatic recording body, and the image on the image transfer electrostatic recording body was almost transferred to the transfer target.
[0089]
(Comparative Example 1)
In place of the release layer in the image transfer electrostatic recording material of Example 1, an image transfer electrostatic recording material was produced in the same manner as in Example 1 except that the following composition was applied in the same manner.
[0090]
Acrylic resin (manufactured by Mitsubishi Rayon Co., Br-101) ··· 10 parts by weight solvent (methyl ethyl ketone) · · 45 parts by weight solvent (toluene) · · 45 parts by weight Using this electrostatic recording medium for image transfer, Example 1 After image formation in the same manner, the image was transferred to the transfer medium produced in Example 1 as in Example 1.
[0091]
After transfer of the image, the transfer target was peeled off, but there was much untransferred image.
[0092]
【The invention's effect】
The electrostatic transfer material for image transfer and the image transfer method of the present invention are excellent in image transfer characteristics even without an adhesive layer during transfer. In particular, when the image is formed with an ion pattern by an ion flow and the formed ion pattern is developed with a wet developer containing a colorant, the image information processed electronically by a computer or the like can be converted into various groups. An image can be formed by transfer onto a material, productivity can be improved by shortening the time, and an image can be transferred to a transfer target having any shape.
[0093]
Furthermore, with regard to image expression, gradation expression that is finer than conventional gradation printing can be performed, and high-definition printing can be obtained. Furthermore, it is possible to produce endlessly wound patterns and the like, and the productivity is good.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of an image transfer electrostatic recording material of the present invention.
FIG. 2 is a schematic cross-sectional view of another example of the electrostatic transfer body for image transfer according to the present invention.
FIG. 3 is a diagram for explaining an example of an image forming apparatus using ion flow.
FIG. 4 is a perspective view illustrating an example of a recording head.
FIG. 5 is a cross-sectional view illustrating another example of a recording head.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus, 2 ... Recording head, 3 ... Dielectric material, 4 ... Line electrode, 5 ... Finger electrode, 6 ... Ion, 7 ... Recording medium, 8 ... Ion flow, 9 ... Screen electrode, 10 ... Insulator, DESCRIPTION OF SYMBOLS 11 ... Hole, 12 ... Corotron discharge type head, 13 ... Metal container, 14 ... Electrode for discharge, 15 ... Dielectric, 16 ... Electrode for adjusting ion flow, 20 ... Electrostatic recording body for image transfer, 21 ... Base sheet, 22 ... release layer, 23 ... dielectric release layer made of self-crosslinkable resin, 24 ... conductive layer

Claims (4)

A release layer is provided on a base sheet having a conductive layer, and a dielectric release layer formed of a self-crosslinking resin having a glass transition temperature of −20 ° C. to 100 ° C. is provided on the release layer. An electrostatic recording material for image transfer characterized by the above. The image transfer electrostatic recording material is characterized in that after an ion pattern is formed by ion flow, the formed ion pattern is developed with a wet developer containing a colorant to form a transfer image. The electrostatic recording material for image transfer according to claim 1. On an electrostatic recording medium for image transfer, in which a release layer formed on a base sheet having a conductive layer and a dielectric release layer formed of a self-crosslinking resin having a glass transition temperature of −20 ° C. to 100 ° C. are sequentially provided. An image transfer method comprising: forming a transfer image; and superimposing and transferring a transfer target body, and transferring the image on the image transfer electrostatic recording body onto the transfer target body. An image for transfer is formed by forming an ion pattern by ion flow on an electrostatic recording medium for image transfer, and then developing the formed ion pattern with a wet developer containing a colorant. The image transfer method according to claim 4.

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