JP4373203B2 - Electrophotographic printing method - Google Patents

Description

  The present invention relates to an electrophotographic printing method, and more particularly to a liquid toner for printing and a printing method using the same.

  Conventional printing methods are applied to various forms of fiber products such as yarn, knitted fabric, secondary products, etc., and mainstream are roller printing using an intaglio plate by screen type and machine operation, screen by stencil printing, and pattern printing.

  Screen printing includes hand printing, semi-automatic screen printing machine, printing with an automatic traveling screen printing machine, and printing with a flat type and rotary type automatic screen printing machine. However, roller printing has a complicated process of engraving a pattern on a metal roller and handling of the roller is difficult, and screen printing has problems such as time-consuming screen production and time-consuming printing work. . In addition, rotary screen printing has problems such as the time required for screen production and roller engraving. As described above, the conventional printing method has a complicated manufacturing process and takes a long time until completion, and thus a simple printing method has been desired.

  In recent years, a printing method using an ink jet which can be manufactured in a short period of time while omitting a conventional engraving plate making process has been proposed (see, for example, Patent Documents 1 and 2). However, the ink-jet printing method has drawbacks such that the density cannot be increased, and the density changes while printing.

  In order to solve these problems, a printing method using an electrophotographic method has attracted attention and has been recently developed. In this method, an electrostatic latent image is formed on a photoreceptor, toner is adhered, the toner is transferred to cloth, and the toner is fixed by heat (for example, see Patent Documents 3 and 4). However, the electrophotographic printing method of this document uses a dry toner, and since the toner layer thickness is thick, the touch is not good, and because the resin is physically attached to the fiber, the friction fastness, There were problems such as poor washing resistance.

  An electrophotographic printing method using liquid toner has also been devised. In this method, a liquid toner using a sublimation dye is developed by an ion flow, a pattern is printed on a transfer material, and this is superposed on a cloth to perform sublimation heat transfer (see, for example, Patent Documents 5 and 6). This method is a simple method with a natural touch and the like. However, in the case of color, there are drawbacks such as difficulty in producing a density superimposed on the second color and poor washing resistance. Further, the toner does not penetrate to the back side of the cloth, and it is necessary to print on both sides. In addition, the work is complicated, and there is a problem that paper (transfer material) that is no longer necessary after transfer onto the cloth is wasted.

Japanese Patent Laid-Open No. 10-195576 Japanese Patent No. 2995135 JP-A-5-027474 Japanese Patent Laid-Open No. 5-033275 Japanese Patent Laid-Open No. 9-73198 JP-A-10-239916

  The present invention has been made in consideration of the above-described circumstances, and provides an electrophotographic liquid toner for printing that can obtain a high-resolution image with a high image density, and a printing method thereof, and in particular, a cloth with poor smoothness. In contrast, an object of the present invention is to provide an electrophotographic liquid developer for textile printing that has a high density, is free from background stains, and provides a high-resolution image and a printing method thereof.

  Furthermore, it is providing the textile printing method which can prevent the fiber which mixes in a machine at the time of transcription | transfer by suppressing the fabric's quelling. The present invention also provides a wasteful printing method that greatly improves the workability of printing and has on-demand characteristics.

In order to solve the above-mentioned problems, the invention described in claim 1 is based on an electrophotographic method in which toner particles in which a colorant is dispersed in a carrier liquid having a volume resistance of 10 ⁹ Ω · cm or more and a high resistance and low dielectric constant are obtained. in textile printing method according to the direct transfer method for printing directly on the printed fabric, characterized by 1.2mg ^/ cm ² ~4.4mg ^/ cm 2 of solvent coating or spraying an electrophotographic printing method in transfer cloth before transfer.

  The invention according to claim 2 is characterized in that in the electrophotographic printing method according to claim 1, the viscosity of the solvent to be applied or sprayed is 0.3 to 100 mPa · s.

The invention according to claim 3 is the electrophotographic printing method according to claim 1, wherein the volume resistance of the solvent to be applied or sprayed is 2 × 10 ⁹ to 1 × 10 ¹⁶ Ω · cm. It is characterized by.

The invention described in claim 4 is characterized in that in the electrophotographic printing method according to claim 1, the solvent to be applied or sprayed is the same component as the dispersion medium in which the toner particles are dispersed. To do.

The invention according to claim 5 is the electrophotographic printing method according to claim 1, characterized in that the solvent to be applied or sprayed is an aliphatic saturated hydrocarbon having a boiling point of 100 to 350 ° C. .

According to a sixth aspect of the present invention, in the electrophotographic printing method according to any one of the first to fifth aspects, the electrophotographic printing method is characterized in that the colorant of the liquid toner is a dye.

The invention described in Claim 7, in an electrophotographic printing method according to claim 6, wherein the purity of the dye in the liquid toner, wherein the electrophotographic printing method from 80 to 100%.

The invention according to claim 8 is the electrophotographic printing method according to claim 6 or 7 , characterized in that the electrophotographic printing method contains an alkali-soluble resin or a water-soluble resin in at least a part of the resin in the liquid toner. And

The invention according to claim 9 is the electrophotographic printing method according to claim 8 , wherein the acid value of the alkali-soluble or water-soluble resin of the liquid toner is 0 to 2000 mg / KOH. Features.

The invention according to claim 10 is the electrophotographic printing method according to any one of claims 6 to 9 , wherein the colorant of the liquid toner is in the presence of humic acid, humic acid salt or humic acid derivative. The electrophotographic printing method is characterized in that it is kneaded or flushed with a water-soluble resin.

The invention according to claim 11 is the electrophotographic printing method according to any one of claims 6 to 10 , wherein the liquid toner has an average particle diameter of 0.1 to 5 μm. Features.

The invention according to claim 12 is the electrophotographic printing method according to any one of claims 1 to 11 , wherein the electrostatic latent image is developed on the photosensitive member, and then pressure is applied by a transfer roller. It is characterized by an electrophotographic textile printing method for transferring the ink.

The invention according to claim 13 is the electrophotographic printing method according to any one of claims 1 to 12 , wherein the linear velocity of the developing roller for developing the toner with respect to the linear velocity of the photoreceptor is high. The electrophotographic printing method is characterized in that the linear speed of the squeeze roller for removing excess solvent is 1.2 to 4 times, and 1.2 to 4 times.

The invention according to claim 14 is the electrophotographic printing method according to any one of claims 1 to 13 , wherein the photoconductor is arranged in a tandem type and the image is transferred to a cloth affixed on the belt. It is characterized by an electrophotographic printing method for full color printing.

  According to the present invention, since direct printing is performed by an electrophotographic method in which a solvent is applied to or sprayed on a transfer cloth before transfer, it is excellent in density, background stain, resolution, transferability, and prevention of mixing of fiber pieces, and on demand. Excellent printing becomes possible.

Further, since the viscosity of the solvent is from 0.3 m to 100 mPa · s, no bleeding or image flow occurs, and in addition to the above-described effects, further excellent printing is possible. Furthermore, since the volume resistance of the solvent is 2 × 10 ⁹ to 1 × 10 ¹⁶ Ω · cm, in addition to the above-described effects, printing with further excellent transferability is possible.

Further, since the amount of the solvent is 0.1 to 10 mg / cm ² , there is no bleeding and no image flow, and in addition to the above-described effects, further excellent printing is possible. In addition, since the solvent to be applied or sprayed is the same component as the dispersion medium in which the toner particles are dispersed, the quality is stable even if the solvent adheres to the photoconductor and enters the developing tank. It becomes possible to provide.

  Furthermore, since the solvent to be applied or sprayed is an aliphatic saturated hydrocarbon having a boiling point of 100 to 350 ° C., there is no problem in the coloring process and a high-quality image can be provided. Further, since the colorant is a dye, and the purity of the dye is 80% or more, it is possible to provide a high-quality image with good dyeability and washing resistance in printing and high image density.

  Furthermore, since an alkali-soluble resin or a water-soluble resin is contained in at least a part of the resin, a high-quality image with good texture is provided, and the acid value of the alkali-soluble resin or the water-soluble resin is 0 to 2000 mg. Therefore, a high quality image can be provided. Since the colorant is kneaded or flushed using a polyolefin resin and a water-soluble resin in the presence of humic acid, humic acid salt or humic acid derivative, and the average particle size is 0.1 to 5 μm. High quality images can be provided.

  In addition, after developing the electrostatic latent image on the photoconductor, pressure is applied by a transfer roller to form an image, and after developing the electrostatic latent image on the photoconductor, transferring the toner image to the intermediate transfer body, Since it is formed, transferability to paper or cloth having poor smoothness is improved.

  Including a step of spraying a solvent onto the intermediate transfer body before the secondary transfer has an advantage that transferability is further improved. Further, when the linear velocity of the developing roller is 1.2 to 6 times that of the photosensitive member and the linear velocity of the squeeze roller is 1.2 to 4 times, a high quality image can be obtained. If a photoconductor is arranged in a tandem type and an image is transferred onto a cloth affixed on a belt, high-quality full-color printing can be provided at high speed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The present invention relates to a method in which toner particles in which a colorant is dispersed in a carrier solution having a high resistivity and a low dielectric constant of 10 ⁹ Ω · cm or more are printed directly on a printed fabric by electrophotography, and transferred before transfer. An electrophotographic printing method characterized by applying or spraying a solvent onto a cloth. By applying or spraying a solvent to the cloth surface before transfer, unevenness on the cloth surface can be reduced even in a cloth having poor smoothness, so that transferability is improved and the density on the cloth can be increased. When the solvent enters the recess on the cloth surface, the toner is transferred to the recess through the solvent.

  In the case of the ink jet method, there are many proposals of a pretreatment agent (JP 2000-226780 A, JP 2002-348786 A, etc.) for the purpose of preventing bleeding and improving color developability. There has been no proposal to apply or spray a solvent as described above.

  In addition, by applying or spraying a solvent, the cloth can be prevented from becoming dirty, and fibers can be prevented from being mixed into the machine. In particular, if fibers adhere to a cleaning blade or the like, abnormal images such as black stripes are generated, which is effective for obtaining high-quality printing.

  The viscosity of the solvent to be applied or sprayed is preferably 0.3 to 100 mPa · s. If the viscosity is 0.3 mPa · s or less, the viscosity is too low and the solvent immediately penetrates into the cloth, so that the recess cannot be sufficiently filled. On the other hand, if it is 100 mPa · s or more, the permeability to the cloth is too low, and the solvent also spreads and the image flow occurs on the convex surface.

The volume resistance of the solvent to be applied or sprayed is desirably 2 × 10 ⁹ to 1 × 10 ¹⁶ Ω · cm. When it is 2 × 10 ⁹ Ω · cm or less, the resistance of the cloth coated with the solvent is lowered, and the transferability is lowered. Even at 1 × 10 ¹⁶ Ω · cm or more, the resistance is too high and transferability is lowered.
The amount of solvent applied or sprayed is preferably 0.1 to 10 mg / cm ² . If it is 0.1 mg / cm ² or less, the solvent is consumed by soaking into the cloth, and the recess of the cloth cannot be filled, resulting in a decrease in transferability. If it is 10 mg / cm ² or more, bleeding and image flow occur due to excessive solvent.

  The boiling point of the solvent to be applied or sprayed is preferably 100 to 350 ° C. When the temperature is 100 ° C. or lower, the solvent is liable to volatilize before transfer, and the effect of improving transferability is reduced. Above 350 ° C., the solvent is difficult to volatilize, and the solvent cannot be removed in the color development step, causing a problem in color development characteristics.

  Since a part of the solvent applied or sprayed on the cloth adheres to the photosensitive member or the intermediate transfer member and is returned to the developing tank by cleaning, the same solvent as the dispersion medium in which the toner is dispersed is desirable. Preferable examples of the solvent to be applied or sprayed include the following.

  Isopar G, Isopar H, Isopar L, Isopar M, Isopar V, Solvesso 100, Solvesso 150, Solvesso 200, Exor 100/140, Exor D30, Exor D40, Exor D80, Exor D110, Exor D130 (Exxon Mobil Corporation) , KF96 1-10 cst (Shin-Etsu Silicon) and the like.

  Examples of the colorant that can be used in the present invention include acid dyes, reactive dyes, direct dyes, disperse dyes, cationic dyes, organic pigments, and inorganic pigments. For example, Direct Fast Yellow R, Direct First Yellow GC, Direct First Orange, Direct Sky Blue 5B, Direct Splash Red 3B, Coplantin Green G, Direct Fast Black D etc. for direct dyes, Acid Brilliant Scarlet for acid dyes 3R, Acid Violet 5B, Alizarin Direct Blue A2G, Acid Cyanonin 6B, Acid Cyanonin Green G, Acid First Black VLG, etc. Cationic dyes include Cationic Yellow 3G, Cationic Golden Yellow GL, Cationic Orange R, Cationic Brilliant Red 4G, Disperse Fast Yellow G, Disperse Blue FFR, Disperse Blue, such as cationic blue 5G Lean B, disperse yellow 5G, Disperse Red FB, etc., the reactive dye, Reactive Orange 2R, Reactive Red 3B, Reactive Blue 3G, Reactive Brilliant Blue R, Reactive Black B, and the like. For inorganic pigments, Printex V, Special Black 15, Special Black 4, Mitsubishi # 44, # 30, MR-11, Legal 400, 660, Black Pearl 900, 1100 and other carbon blacks, and for organic pigments, phthalocyanine blue , Phthalocyanine green, sky blue, rhodamine rake, malachite green rake, methyl violet rake, peacock blue rake, naphthol green B, naphthol green Y, naphthol yellow S, naphthol red, resor fast yellow 2G, permanent red 4R, brilliant fast scarlet, Hansa Yellow, Benzidine Yellow, Resol Red, Lake Red C, Lake Red D, Brilliant Carmine 6B, Permanent Red F R, and the like. Both pigments and dyes can be used, but the use of a dye as a colorant is superior in texture, dyeability and wash fastness.

  When using a dye, it is better to select the dye depending on the material of the printed fabric, and the dyeing property and fastness to washing are better. For example, in the case of a polyester fiber, a disperse dye, in a cellulose fiber, a reactive dye, a direct dye, and an acrylic fiber Acidic dyes are preferred for cationic dyes, polyamide fibers and wool fibers.

  Moreover, when it is desired to suppress the polarity of the functional group with a reactive dye or an acid dye, it is also effective to stabilize the charging performance by wrapping with a resin. However, if the resin content is increased, the dyeing on the back surface and the texture of the fibers become worse, so it is desirable to suppress the amount to 4 times or less with respect to the colorant.

  Commercially available powder dyes have a dye purity of about 50% and often contain a large amount of salt and sodium sulfate, which adversely affects the resistance and chargeability of the liquid. It is better to use. A purity of 80% or more is desirable.

  The carrier liquid used in the liquid developer of the present invention is preferably a high resistance and low dielectric constant material, such as isoparaffin hydrocarbons and silicone oils. Isoparaffin hydrocarbons include Isopar C, Isopar E, Isopar G, Isopar H, Isopar L, Isopar M, Isopar V (Exxon Chemical), etc., and silicone oils include KF96 1-10000 cst (Shin-Etsu Silicon), SH200. , SH344 (Toray Silicon), TSF451 (Toshiba Silicon), and the like. Of these, saturated hydrocarbons having a boiling point of 130 ° C. or higher are good in terms of toner odor and safety. These solvents can be evaporated at the stage of heating and steaming in the subsequent process.

  Further, as the dispersing resin preferably used in combination with the present invention, vinyl monomer A represented by the general formula (A) and

(R ¹ represents H or CH ₃ and n represents an integer of 6 to 20)

  Each of the vinyl monomers represented by the general formula (B) and vinyl pyridine, vinyl pyrrolidone, ethylene glycol dimethacrylate, styrene, divinylbenzene, vinyltoluene, or several types of copolymers, graft copolymer Coalesce.

(R ² is an alkyl group having 1 to 4 carbon atoms)

  Further, when an alkali-soluble resin or a water-soluble resin is contained in a part of the resin, the resin in the toner is dissolved and detached from the cloth in the coloring and rinsing steps, so that a printed fabric with good texture can be obtained.

  In the colored water washing process, after steaming at around 100 ° C., it may be treated with about 0.1 to 2% alkali. If no alkali-soluble resin or water-soluble resin is contained, the resin will remain and the texture will deteriorate. However, when an alkali-soluble resin or a water-soluble resin is contained, the resin is detached in the coloring water washing step, and printing with a good texture can be obtained.

  Alkali-soluble resin or water-soluble resin is water-soluble melamine resin, water-soluble rosin modified resin, water-soluble polyester resin, water-soluble acrylic resin, water-soluble epoxy resin, polyvinyl alcohol, polyvinyl pyrrolidone, polyethyleneimine, carboxymethyl cellulose, sodium alginate, There are collagen, gelatin, starch, chitosan and the like. The products include Kuraray's Poval (PVA), Isoban (isobutylene / maleic acid resin), Harima Kasei Neotor, Halidip (alkyd resin, acrylic resin), Nippon Synthetic Chemicals Ecorety (PVA), Nagase ChemteX Examples include deconal (epoxy resin), Julia (acrylic resin), Kabsen (polyester resin) manufactured by Nippon Pure Chemical Co., Ltd.

  The acid value is preferably 0 to 2000 mg / KOH, and if it is higher than 2000 mg / KOH, the development characteristics are deteriorated. In particular, when an alkali-soluble resin, a water-soluble resin, or a colorant is subjected to a flushing treatment, a developer excellent in image surface can be obtained.

In the flushing process, a resin dispersion medium is further added to a water-containing liquid in which a pigment is dissolved in water, and the mixture is mixed well in a kneader called a flasher, and water existing around the pigment is replaced by a resin dispersion medium added later. The process to do. The water taken out by this operation is discharged, the pigment is dispersed in the resin solution, dried, the solvent is removed, and the resulting mass is pulverized to obtain a colorant powder. The ratio of the colorant to the resin during the flushing is suitably 10 to 60 parts by weight of the colorant with respect to 100 parts by weight of the resin. It is particularly advantageous to perform the flushing treatment in the presence of humic acid, a humic acid salt (Na salt, NH ₄ salt etc.) or a humic acid derivative. The amount of these humic acids added is suitably about 0.1 to 30% by weight of the colorant-containing liquid.

  The average particle size of the liquid developer is preferably 0.1 to 3 μm. If the average particle size is 0.1 μm or less, sufficient density may not be obtained or blurring may occur easily. If it is 3 μm or more, color and resolution are improved. May get worse.

When development is performed on the photosensitive member and the transfer roller is applied with a pressure of 0.1 to 3 kg / cm ² , the transfer property is improved in the case of transfer paper or textile printing with poor smoothness, and a high-density image can be formed. Further, when transferring using an intermediate transfer member, transfer performance is improved because a higher pressure is applied. However, since the amount of solvent during transfer is less than when no intermediate transfer member is used, in the case of textile printing, a solvent such as aliphatic hydrocarbon or silicone oil is sprayed onto the intermediate transfer member before secondary transfer. It is desirable to secure the necessary amount of solvent. A good spraying amount is about 0.20 to 0.70 mg / cm ² .

  In the case of textile printing, in order to improve the density, the amount of the developer is increased or the solvent squeeze amount of the reverse roller after development is decreased, so that the amount of the developer on the photosensitive member is increased and applied to the cloth. Increasing the solvent penetration is effective.

  FIG. 1 shows an example of the image forming method of the present invention. Charge is applied to the photosensitive member 3 by the charging voltage applying member 1, and the charge in the non-image area is erased by exposure 2. As the photoreceptor 3, a selenium photoreceptor, an organic photoreceptor, or an amorphous silicon photoreceptor can be used. The surface potential of the photoreceptor is good in the range of 400 to 1600v. The latent image on which the charge remains on the photosensitive member is developed with the liquid developer 5 supplied from the developing roller 4, the excess developer is removed by the reverse roller (squeeze roller) 6, and the transfer voltage applying member 7 removes the toner. A voltage of a charge and a reverse charge is applied and transferred to the textile fabric 8.

  The developing roller 4 rotates in the forward direction with the photosensitive member 3, the reverse roller 6 rotates in the reverse direction, the linear velocity relative to the photosensitive member is 1.2 to 6 times that of the developing roller, and the linear velocity of the reverse roller (squeeze roller) is 1.2 to 4 times is effective.

  The gap between the developing roller and the photosensitive member is preferably 50 to 250 μm, and the gap between the reverse roller is 30 to 150 μm. The transfer voltage is preferably in the range of 500 to 4000 v.

  After the toner remaining on the photoconductor without being transferred to the cloth is removed by the cleaning blade 9 and the cleaning roller 10, the photoconductor is neutralized by the static eliminator 11. Further, an image can be formed in the same manner by a developing method that erases the charge in the image portion and leaves the charge in the non-image portion.

FIG. 2 shows an example in which the transfer voltage applying member in FIG. 1 is changed from a charger system to a roller system. When the roller 12 is used, a transfer pressure can be applied as compared with the charger method, and therefore, the transfer property is good even in the case of a cloth with rough surface roughness and large unevenness. The transfer pressure is preferably 0.1 to 3 kg / cm ² .

FIG. 3 shows an example in which an intermediate transfer member 13 is added to the apparatus shown in FIG. Since a higher transfer pressure than that of the apparatus of FIG. 2 can be applied, the transferability is good even in the case of a cloth with rough surface roughness and large unevenness. The transfer pressure is preferably 0.1 to 5 kg / cm ² . However, the solvent component in the toner is reduced during the primary transfer to the intermediate transfer member, and the amount of solvent required for the secondary transfer from the intermediate transfer member to the cloth may be reduced. It is effective to add a step of spraying a solvent onto the substrate.

  FIG. 4 shows an example of an apparatus that performs full-color printing by arranging the photoreceptors 3 in tandem and attaching a cloth on a cloth conveying belt. A developer is prepared by adding a colorant, a resin, and a carrier liquid to a dispersing machine such as a ball mill, a kitty mill, a disk mill, and a pin mill, dispersing and kneading to prepare a concentrated toner, and dispersing this in the supporting liquid of the present invention. Can be obtained.

  Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples.

[Example 1]
Direct dye (Nippon Kayaku Kayfect Red P) 50 parts Isopar H 20% solution of lauryl methacrylate / methyl methacrylate / methacrylic acid / glycidyl methacrylate (80/10/5/5) copolymer
110 parts polyolefin resin (ethylene / vinyl acetate copolymer resin)
(Evaflex) (Mitsui / DuPont) 60 parts Water-soluble resin Poval (PVA) (Kuraray) 60 parts Isopar H 180 parts Charge control agent (zirconium naphthenate) 3 parts in a ball mill and dispersed for 24 hours, then Isopar H 300 parts were added and dispersed for 1 hour to obtain a concentrated toner.
Electrophotographic printing was performed with the apparatus shown in FIG. 2 using a developer in which 100 g of this concentrated toner and Isopar H1L were mixed. The solvent spray in FIG. 1 was performed using Isopar H at a spray amount of 1.2 mg / cm ² .

[Example 2]
Disperse dye (Arimoto Chemical FS Red 1339) 35 parts Polyolefin resin (ethylene / methacrylic acid copolymer resin)
(Nucrel) (Mitsui / DuPont) 40 parts Water-soluble resin Kabusen (water-soluble polyester) (Nagase ChemteX) 70 parts kneaded and pulverized 90 parts lauryl methacrylate / methyl methacrylate / methacrylic acid / glycidyl methacrylate (80/10/5/5) Copolymer Isopar H20% solution
120 parts Isopar H 200 parts Charge control agent (zirconium naphthenate) 2 parts in a ball mill and dispersed for 24 hours, 350 parts of Isopar H was further added and dispersed for 1 hour to obtain a concentrated toner.
Electrophotographic printing was performed with the apparatus shown in FIG. 2 using a developer in which 100 g of this concentrated toner and Isopar H1L were mixed. The solvent spray in FIG. 2 was performed using Isopar H at a spray amount of 2.5 mg / cm ² .

[Example 3]
Disperse dye (Nippon Kayaku Kalon, Polyester, Turq. Blue, GL-S 200%) 50 parts Polyolefin resin (ethylene / vinyl acetate copolymer resin) (Evaflex) (Mitsui / DuPont) 20 parts Water-soluble resin Halidibu (water-soluble) Alkyd resin) (Harima Kasei) 80 parts Nitrohumic acid 3 parts were kneaded and flushed.
70 parts of the above flashing kneaded product Isopar H 20% solution of lauryl methacrylate / methyl methacrylate / methacrylic acid / glycidyl methacrylate (80/10/5/5) copolymer
100 parts Isopar H 250 parts Charge control agent 5 parts was placed in a ball mill and dispersed for 24 hours, and then 250 parts of Isopar H was added and dispersed for 1 hour to obtain a concentrated toner.
Electrophotographic printing was performed with the apparatus shown in FIG. 2 using a developer in which 100 g of this concentrated toner and Isopar H1L were mixed. The solvent spray in FIG. 2 was performed using Isopar G at a spray amount of 3.2 mg / cm ² .

[Example 4]
A concentrated toner was produced in the same manner as in Example 1 except that the direct dye of Example 1 (Nippon Kayaku Kaffect Red P purity 50%) was used after being purified to a purity of 90%.
Electrophotographic printing was performed with the apparatus shown in FIG. 2 using a developer in which 100 g of this concentrated toner and Isopar H1L were mixed. The solvent spray in FIG. 2 was performed using Isopar H at a spray amount of 1.8 mg / cm ² .

[Example 5]
A concentrated toner was prepared in the same manner as in Example 2 except that the dispersion medium in Example 2 was changed from Isopar H to silicone oil (KF-96 2cst).
Electrophotographic printing was performed with the apparatus of FIG. 2 using a developer in which 100 g of this concentrated toner and silicone oil (KF-96 2cst) were mixed. The solvent application in FIG. 2 was performed with silicone oil (KF-96 2cst) and an application amount of 2.2 mg / cm ² .

[Example 6]
Disperse dye (Arimoto Chemical FS Blue 1538) 40 parts Polyolefin resin (Ethylene / methacrylic acid copolymer resin) (Nuclele) (Mitsui / DuPont) 5 parts Water-soluble resin Kabusen (water-soluble polyester) (Nagase ChemteX)
95 parts were kneaded and pulverized.
90 parts of the above kneaded pulverized product Isopar H 20% solution of lauryl methacrylate / methyl methacrylate / methacrylic acid / glycidyl methacrylate (80/10/5/5) copolymer
120 parts Isopar H 200 parts Charge control agent (zirconium naphthenate) 2 parts in a ball mill and dispersed for 24 hours, 350 parts of Isopar H was further added and dispersed for 1 hour to obtain a concentrated toner.
Electrophotographic printing was performed with the developer shown in FIG. 2 using a developer in which 100 g of this concentrated toner and Isopar M were mixed. The solvent application in FIG. 2 was performed using Isopar V at an application amount of 1.9 mg / cm ² .

[Example 7]
Disperse dye (Arimoto Chemical FS Blue 1538) 40 parts Polyolefin resin (ethylene / methacrylic acid copolymer resin ionomer) (High Milan) (Mitsui / DuPont) 95 parts Water-soluble resin Kabsen (water-soluble polyester) (Nagase Chemtex) 5 parts 90 parts of kneaded and pulverized product 90 parts of lauryl methacrylate / methyl methacrylate / methacrylic acid / glycidyl methacrylate (80/10/5/5) copolymer Isopar H 20% solution
120 parts Isopar H 200 parts Charge control agent (zirconium naphthenate) 2 parts in a ball mill and dispersed for 24 hours, 350 parts of Isopar H was further added and dispersed for 1 hour to obtain a concentrated toner.
Electrophotographic printing was performed with the apparatus shown in FIG. 2 using a developer in which 100 g of this concentrated toner and Exol D30 were mixed. The solvent application in FIG. 2 was performed using Exol D30 at an application amount of 4.4 mg / cm ² .
The textile fabrics of Examples 1 to 7 were subjected to appropriate post-treatments for each fiber such as steaming and soaping. The results are shown in Table 1 below.

[Comparative Examples 1 to 10]
Textile printing was performed in the same manner as in Examples 1 to 10 except that the solvent was not applied and sprayed.
As is clear from the above results, a printing fabric having a high transfer rate, a high fabric density and a high resolution was obtained by this image forming method and developer.

* Concentration is measured by X-Rite * Soil is soiled with a soiled grade sample cloth 5: Best, 1: Worst * Texture is textured with a textured stage sample cloth 5: Softness similar to the cloth alone, 4: Soft, 3: Moderate, 2: Slightly hard, 1: Hard * Average particle size measured by Shimadzu SA-CP3 * Resolution is based on step samples 5: Best, 1: Worst * Transfer rate is based on the density measured by the tape peeling method Calculated transfer rate = (concentration on photoconductor before transfer−residual density on photoconductor after transfer) / (density on photoconductor before transfer) × 100%
* Crossage is evaluated with a sample of 1000 samples after printing 1000 sheets. 5: Best, 1: Worst

It is a schematic block diagram which shows an example of the textile printing image forming apparatus of this invention. It is a schematic block diagram which shows another example of the textile printing image forming apparatus of this invention. 1 is a schematic configuration diagram of an image forming apparatus using an intermediate transfer of the present invention. It is a schematic block diagram which shows the example of the color textile printing image forming apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Charging voltage provision member 2 Exposure 3 Photoconductor 4 Developing roller 5 Liquid developer 6 Reverse roller (squeeze roller)
7 Transfer voltage applying member 8 Textile cloth 9 Cleaning blade 10 Cleaning roller 11 Static eliminator 12 Roller system 13 Intermediate transfer member 14 Solvent spray

Claims (14)

In a printing method using a direct transfer method in which toner particles in which a colorant is dispersed in a carrier liquid having a high resistivity and a low dielectric constant, a volume resistance of 10 ⁹ Ω · cm or more, are printed directly on a printed fabric by electrophotography. electrophotographic printing method characterized by spraying the solvent coating or the transfer fabric ^{1.2mg / cm 2 ~4.4mg / cm 2} .   2. The electrophotographic printing method according to claim 1, wherein the viscosity of the solvent to be applied or sprayed is 0.3 to 100 mPa · s. 2. The electrophotographic printing method according to claim 1, wherein the volume resistance of the solvent to be applied or sprayed is 2 × 10 ⁹ to 1 × 10 ¹⁶ Ω · cm. 2. The electrophotographic printing method according to claim 1, wherein the solvent to be applied or sprayed is the same component as the dispersion medium in which the toner particles are dispersed. 2. The electrophotographic printing method according to claim 1, wherein the solvent to be applied or sprayed is an aliphatic saturated hydrocarbon having a boiling point of 100 to 350 ° C. 6. The electrophotographic printing method according to claim 1, wherein the colorant of the liquid toner is a dye. 7. The electrophotographic printing method according to claim 6, wherein the purity of the dye of the liquid toner is 80 to 100%. 8. The electrophotographic printing method according to claim 6, wherein at least part of the resin in the liquid toner contains an alkali-soluble resin or a water-soluble resin. 9. The electrophotographic printing method according to claim 8, wherein the acid value of the alkali-soluble or water-soluble resin in the liquid toner is 0 to 2000 mg / KOH. 10. The electrophotographic printing method according to claim 6, wherein the colorant of the liquid toner is kneaded or flushed using a water-soluble resin in the presence of humic acid, humic acid salt, or humic acid derivative. An electrophotographic printing method characterized by being treated. 11. The electrophotographic printing method according to claim 6, wherein the liquid toner has an average particle diameter of 0.1 to 5 μm. 12. The electrophotographic printing method according to claim 1, wherein the electrostatic latent image is developed on the photosensitive member, and then the image is transferred by applying pressure with a transfer roller. Method. The electrophotographic textile printing method according to any one of claims 1 to 12, wherein the linear velocity of the developing roller for developing the toner is 1.2 to 6 times the linear velocity of the photoreceptor, and the excess solvent is removed. An electrophotographic textile printing method, wherein a linear speed of a squeeze roller to be removed is 1.2 to 4 times. 14. The electrophotographic printing method according to claim 1, wherein a photoconductor is arranged in a tandem type, an image is transferred to a cloth affixed on a belt, and full color printing is performed. Printing method.