JP2008122831A - Electrophotographic textile printing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrophotographic liquid toner for textile printing giving a high-resolution image of high image density and a textile printing method using the same, in particular, to provide an electrophotographic liquid developer for textile printing having good transferability and giving a high-resolution image and a textile printing method using the same, and to provide an effective textile printing method which enhances the work efficiency of textile printing and is provided with on-demand property. <P>SOLUTION: In the electrophotographic textile printing method, cloth to be printed is directly printed by an electrophotographic process using the liquid toner prepared by dispersing a colorant and a resin in a carrier liquid having a volume resistivity of 10<SP>9</SP>-10<SP>16</SP>Ω cm, transfer cloth having a volatile matter content of 0.1-200 mg/m<SP>2</SP>is used. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electrophotographic liquid toner for printing and a printing method.

  The textile printing method is applied to various forms of textiles such as yarns, knitted fabrics, secondary products, etc., and the mainstream is roller printing using an intaglio plate by screen type and machine operation, screen by stencil printing, and paper 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. . Further, the rotary screen printing also has a problem that it takes time to produce a screen and engrave a roller. Thus, the conventional printing method has a complicated manufacturing process and spends a long time until completion, so a simple printing method has been desired.

  In recent years, there have been proposed printing methods (Patent Documents 1 and 2) using an ink jet which can be manufactured in a short period of time while omitting the conventional engraving plate making process. 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 been recently developed (Patent Documents 3 and 4). In this method, an electrostatic latent image is formed on a photosensitive member, toner is adhered, the toner is transferred to cloth, and the toner is fixed by heat. However, the printing method by the electrophotographic method of Patent Documents 3 and 4 uses a dry toner, and since the toner layer thickness is thick, the touch is not good, and it is physically attached to the fiber by a resin. There were problems such as poor friction fastness and washing resistance.

  As an electrophotographic printing method using liquid toner, those described in Patent Documents 5 and 6 have been devised. This is a liquid toner using a sublimation dye, which is developed by ion flow, a pattern is printed on a transfer material, and this is superposed on cloth and transferred by sublimation heat. 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. Also, the toner does not penetrate to the back of the cloth, and it is necessary to perform double-sided printing. In addition, the work is complicated, and there is a problem that paper (transfer material) that is no longer necessary after transferring to a cloth is wasted.

  Although the direct printing method using liquid toner by electrophotography does not have these problems, the transferability is insufficient due to the surface properties and materials of the cloth. For this reason, Patent Documents 7 and 8 devise a solvent amount optimization and a cloth smoothing method at the time of transfer, but further improvement in transferability is required.

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 JP 2005-195636 A JP 2006-47483 A

An object of the present invention is to provide an electrophotographic liquid toner for textile printing having a high image density and a high resolution image, and a textile printing method thereof.
In particular, it is to provide an electrophotographic liquid developer for textile printing having good transferability and capable of obtaining a high resolution image, and a printing method thereof.
The present invention also provides a wasteful printing method that greatly improves the workability of printing and has on-demand characteristics.

The above-described problem is (1) “printing in which a liquid toner in which a colorant and a resin are dispersed in a carrier liquid having a volume resistance of 10 ⁹ to 10 ¹⁶ Ω · cm is directly printed on a printing cloth by electrophotography. In the method, an electrophotographic printing method using a transfer cloth having a volatile content of 0.1 to 200 mg / m ² ”,
(2) In a printing method in which a liquid toner in which a colorant and a resin are dispersed in a carrier liquid having a volume resistance of 10 ⁹ to 10 ¹⁶ Ω · cm is printed directly on a printed fabric by electrophotography, An electrophotographic printing method characterized by having a step of heating the transfer fabric to a volatile content of 0.1 to 200 mg / m ² ”;
(3) In a printing method in which a liquid toner in which a colorant and a resin are dispersed in a carrier liquid having a volume resistance of 10 ⁹ to 10 ¹⁶ Ω · cm is printed directly on a printed fabric by electrophotography, 70 to 160 ° C. An electrophotographic printing method comprising a step of heating a transfer cloth before transfer with a heat source of 0.1 to 200 mg / m ² of a volatile content ”,
(4) “The electrophotographic printing method according to any one of (1) to (3) above, wherein the colorant of the liquid toner is a dye”,
(5) "Electrophotographic printing method according to item (4) above, wherein the purity of the dye is 80 to 100%",
(6) "The electrophotographic printing method according to (4) or (5) above, wherein at least a part of the resin contains an alkali-soluble resin or a water-soluble resin",
(7) "The electrophotographic printing method according to (6) above, wherein the acid value of the alkali-soluble or water-soluble resin is 0 to 2000 mg / KOH",
(8) The items (1) to (7), wherein the colorant is kneaded or flushed with a water-soluble resin in the presence of humic acid, humic acid salt or humic acid derivative. ) The electrophotographic printing method according to any one of items
(9) “The electrophotographic printing method according to any one of (4) to (8) above, wherein an average particle size of toner particles of the liquid toner is 0.1 to 5 μm” ,
(10) The electron according to any one of (1) to (9), wherein the latent image on the photosensitive member is developed and then transferred by a pressure from a transfer bias and a transfer roller. Photo printing method ",
(11) Items (1) to (10), wherein after developing the latent image on the photosensitive member, the toner image is primarily transferred to the intermediate transfer member, and then the image is secondarily transferred. The electrophotographic printing method according to any one of "
(12) "The electrophotographic printing method according to item (11), including a step of spraying a solvent onto the intermediate transfer member before the secondary transfer",
(13) “The linear speed of the developing roller for developing the toner is 1.2 to 6 times the linear speed of the photosensitive member, and the linear speed of the squeeze roller for removing excess solvent is 1.2 to 4 times. The electrophotographic printing method according to any one of the above items (1) to (12),
(14) Any one of the above items (1) to (13), wherein the photoconductor is arranged in a tandem type, the image is transferred to a cloth affixed on an endless belt, and full color printing is performed. This is achieved by the described electrophotographic printing method.

  As will be apparent from the following detailed and specific description, according to the present invention, an electrophotographic printing toner having high transferability, high image density, good texture, and excellent resolution, and electrophotography using the toner A printing method can be provided. In addition, the printing workability is greatly improved, and there is an extremely excellent effect that it is possible to provide a wasteless electrophotographic printing method that has on-demand characteristics.

Hereinafter, the present invention will be described in detail.
As described above, the present invention provides a printing method in which a liquid toner in which a colorant is dispersed in a carrier liquid having a high resistance and a low dielectric constant of 10 ⁹ Ω · cm or more is directly printed on a printing cloth by an electrophotographic method. The present invention relates to an electrophotographic printing method characterized by using a transfer cloth having a volatile content of 0.1 to 200 mg / m ² in an electrophotographic apparatus. The volatile component seems to be mainly water, but if it exceeds 200 mg / m ² , the transferability is lowered. The decrease in transferability seems to be caused by a decrease in fabric resistance due to moisture.
The lower the volatile content, the better the transferability, and more preferably 0.1-50 mg / m ² .
The cloth volatile content of the present invention is a value determined by the following.

Any method may be used to bring the cloth volatile content to the level of the present invention, but it is most convenient to add a process of heating the cloth before transfer.
The heating temperature and the heating time vary depending on the speed of the apparatus, but in an apparatus of 10 to 20 m / min, about 3 to 10 seconds is good at 70 to 160 ° C. When the temperature is lower than 70 ° C., the heating effect is small and the amount of volatile components may not reach the level of the present invention, and the contribution to transferability is reduced. If the temperature is higher than 160 ° C., the cloth temperature is not sufficiently lowered until transfer, and the temperature when contacting with the photosensitive member at the time of transfer is increased, the temperature of the developing portion is raised, the developer is deteriorated, and toner fixation occurs. Here, the time between heating and transfer varies depending on the speed of the apparatus, but is usually about 3 to 20 seconds.
When the cloth conveying section is long and the heating time is sufficient for 1 minute or longer, there is no problem even if the heating temperature is lower than 70 ° C. Further, when there is a sufficient distance from the heating part to the transfer part, the printing speed is slow, and the cloth temperature can be reduced to 50 ° C. or lower during transfer, the heating temperature may be higher than 160 ° C. In this case, the heating time can be shortened to 3 seconds or less.
In addition, a method of heating the entire wound cloth portion is also effective. In this case, since it can be heated for a long time, it may be about 60 ° C.
The transfer cloth is heated by a method of sandwiching between a heating roller and a pressure roller (FIG. 5), a method using a belt (FIG. 6) like a fixing roller usually used in electrophotography, or a method of blowing hot air like a dryer (FIG. 7). )and so on. When a roller or a belt is used, it is necessary to use a highly durable member because it contacts the cloth.

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 Cationic dyes such as 3R, Acid Violet 5B, Alizarin Direct Blue A2G, Acid Cyanine 6B, Acid Cyanine Green G, and Acid First Black VLG include cationic yellow 3G, cationic golden yellow GL, cationic orange R, cationic brilliant red 4G, For disperse dyes such as cationic blue 5G, Disperse First Yellow-O G, Disperse Blue FFR, Disperse Lou Green 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 using 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 solution. It is better to use a dye. A purity of 80% or more is desirable.

The carrier liquid used in the liquid developer of the present invention preferably has a high resistance and a low dielectric constant (preferred dielectric constant of the carrier liquid in the present invention is 1.0 to 8.0, more preferably 1.5 to 4.0), Isoparaffin hydrocarbons and silicone oils are good. Isoparaffin hydrocarbons include Isopar C, Isopar E, Isopar G, Isopar H, Isopar L, Isopar M, and Isopar V (Exxon Chemical). , SH344 (Toray Silicone), TSF451 (Toshiba Silicone), etc.
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 a dispersion resin that is preferably used in combination with the present invention,

（Ｒ_１はＨまたはＣＨ_３を、ｎは６〜２０の整数を表わす。）
であらわされるビニルモノマーＡと

(R ₁ represents H or CH ₃ and n represents an integer of 6 to 20)
Vinyl monomer A represented by

（Ｒ_１はＨまたはＣＨ_３、Ｒ₂はＣが１〜４のアルキル基）
で表わされるビニルモノマー及びビニルピリジン、ビニルピロリドン、エチレングリコールジメタクリレート、スチレン、ジビニルベンゼン、ビニルトルエンより選ばれるモノマーＢの各一種づつもしくは、数種の共重合体、グラフト共重合体が挙げられる。

(R ₁ is H or CH ₃ , R ₂ is an alkyl group in which C is 1-4)
And vinyl monomers and vinyl pyridines, vinyl pyrrolidone, ethylene glycol dimethacrylate, styrene, divinyl benzene, and vinyl toluene selected from each of the monomers B, or several types of copolymers and graft copolymers.

Further, some of the resins include alkali-soluble resins and water-soluble resins. When these are contained, the resin in the toner is dissolved and detached from the cloth in the color development and water washing steps, so that a printed fabric having a 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, polyvinylpyrrolidone, polyethyleneimine, carboxymethylcellulose, sodium alginate, There are collagen, gelatin, starch, chitosan and the like.
As products, Kuraray Poval (PVA), Isoban (isobutylene / maleic acid resin), Harima Kasei Neotor, Halidip (alkyd resin, acrylic resin), Nippon Synthetic Chemical Co., Ltd. Ecoati (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 from 0 to 2000 mg / KOH, and if it is higher than 2000 mg / KOH, the development characteristics deteriorate.

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. The flushing treatment is particularly advantageously carried out in the presence of humic acid, humic acid salts (Na salt, NH ₄ salt etc.) or humic acid derivatives. The amount of these humic acids added is suitably about 0.1 to 30% by weight of the colorant-containing liquid.

  The average particle diameter of the liquid toner is desirably 0.1 to 3 μm. If the particle diameter is 0.1 μm or less, sufficient density may not be obtained or blurring may occur easily. If the particle diameter is 3 μm or more, color and resolution are improved. It 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 smaller than when the intermediate transfer member is not used, in the case of printing, a solvent such as aliphatic hydrocarbon or silicone oil is sprayed onto the intermediate transfer member before the 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 photoreceptor by the charging voltage application member, and the non-image area charge is erased by exposure. As the photoreceptor, 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 400v to 1600v. The latent image on which the charge of the photoreceptor remains is developed with a liquid developer supplied from a developing roller, excess developer is removed with a squeeze roller (that is, a reverse roller), and the toner charge is transferred with a transfer voltage applying agent. Apply reverse voltage and transfer it to the printed fabric.
The developing roller rotates in the forward direction with the photosensitive member, the reverse roller rotates in the reverse direction, and the linear velocity with respect to the photosensitive member is 1.2 to 6 times that of the developing roller, and the linear velocity of the squeeze roller is 1.2 to 4 times. Double is effective.
The gap between the roller and the photosensitive member is preferably 50 to 250 μm, and the gap between the reverse roller (aka squeeze roller) is preferably 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 a cleaning blade and a cleaning roller, the photoconductor is discharged.
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. Compared with the charger method, pressure at the time of transfer can be applied, so transferability is good even in the case of a fabric with rough surface 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 is added to the apparatus of 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 for performing full-color printing by arranging photosensitive members in tandem and attaching a cloth on a cloth conveying belt.

  A developer is prepared by introducing a colorant, a resin, and a carrier liquid into 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.

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to these examples. In the examples and comparative examples, “parts” are all parts by weight, and the monomer mixing ratio of the copolymer is a weight ratio.
[Synthesis of acrylic resin]
Moreover, the acrylic resin that is used in the examples described later and is preferable for the present invention can be specifically synthesized as follows, for example.
Isopar H500g was charged into a 3L flask equipped with a stirrer, thermometer, condenser, and dropping funnel, heated to 90 ° C and stirred, 100g lauryl methacrylate (Acrylic ester L manufactured by Mitsubishi Rayon Co., Ltd.), glycidyl methacrylate (acrylic) A monomer solution consisting of 20 g of ester G), 15 g of methacrylic acid (manufactured by Mitsubishi Rayon Co., Ltd.) and 1 g of azbisisobutyronitrile is added dropwise over 2 hours. Thereafter, polymerization is carried out for 5 hours while maintaining at 95 ° C. Thereafter, a monomer solution consisting of 30 g of methyl methacrylate (Acryester M manufactured by Mitsubishi Rayon Co., Ltd.) and 0.2 g of azbisisobutyronitrile is added dropwise over 2 hours, and polymerization is carried out for 1 hour while maintaining at 85 ° C.
The synthesized acrylic resin preferably has a polymerization rate of 95% or more, a molecular weight Mn of about 8000 to about 50,000, and Mw of about 10,000 to about 80,000.

(Example 1)
Disperse dye (SumikaronRed E-FBL) (Sumitomo Chemical Co., Ltd.) (purity 50%) 60 parts of lauryl methacrylate / methyl methacrylate / methacrylic acid / glycidyl methacrylate (80/10/5/5) copolymer Isopar H20% solution 120 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 add 300 parts of Isopar H This was dispersed for 1 hour to obtain a concentrated toner.
Electrophotographic printing was performed with the apparatus of FIG. 2 using a developer in which 100 g of this concentrated toner and Isopar H1L were mixed. The cloth was heated at 150 ° C. for 8 seconds using the dryer type shown in FIG. The above-mentioned “lauryl methacrylate / methyl methacrylate / methacrylic acid / glycidyl methacrylate (80/10/5/5) copolymer” itself is a conventionally known one (see, for example, JP-A-2002-251039). It is.

(Example 2)
Reactive dye (CibacronTurquoiseBlueFGF-P) (Purification treatment purity 82%)
(Ciba Chemical Co., Ltd.) 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

90 parts of the above kneaded pulverized product 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 (naphthenic acid) Zirconium) 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 cloth was heated at 160 ° C. for 3 seconds using the belt type shown in FIG.

(Example 3)
Disperse dye (Arimoto Chemical FS Red1339) (purity 95%) 50 parts Polyolefin resin (ethylene / vinyl acetate copolymer resin) (Evaflex)
(Mitsui / DuPont) 20 parts Water-soluble resin Halidive (water-soluble alkyd resin) (Harima Kasei) 80 parts Nitrohumic acid 3 parts kneader kneading and flushing

70 parts of the above flushing kneaded product 100 parts isopar H 20% solution of isopar H 20% solution of lauryl methacrylate / methyl methacrylate / methacrylic acid / glycidyl methacrylate (80/10/5/5) copolymer 5 parts charge control agent After placing in a ball mill and dispersing for 24 hours, 250 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 cloth was heated by heating the entire wound cloth part to 70 ° C. for 1 hour using the dryer type shown in FIG.

Example 4
A concentrated toner was prepared in the same manner as in Example 1 except that the disperse dye of Example 1 (SumikaronRed E-FBL purity 50%) was purified to 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 cloth heating was performed by arranging the four roller types in FIG. 5 in tandem (heating temperature 140 ° C., heating time 6 seconds).

(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 shown in FIG. 2 using a developer in which 100 g of this concentrated toner and silicone oil (KF-96 2cst) were mixed. Cloth heating was performed by heating the entire wound cloth part to 90 ° C. for 20 minutes using the dryer type shown in FIG.

(Example 6)
Reactive dye (RemazolBlackB) (purified to 97% purity) 40 parts Polyolefin resin (ethylene / methacrylic acid copolymer resin) (Nucle)
(Mitsui / DuPont) 5 parts Water-soluble resin Kabusen (water-soluble polyester) (Nagase ChemteX) 95 parts

90 parts of the above kneaded pulverized product 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 (naphthenic acid) Zirconium) 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 cloth was heated by heating the entire wound cloth part to 90 ° C. for 10 minutes using the dryer type shown in FIG.

(Example 7)
Disperse dye (Arimoto Chemical FS Blue1538) (purity 97%) 40 parts Polyolefin resin (ethylene / methacrylic acid copolymer resin ionomer)
(High Milan) (Mitsui / DuPont) 95 parts Water-soluble resin Kabusen (water-soluble polyester) (Nagase Chemtex) 5 parts

90 parts of the above kneaded pulverized product 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 (naphthenic acid) Zirconium) 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 cloth was heated by heating the entire wound cloth part to 100 ° C. for 5 minutes using the dryer type shown in FIG.

(Example 8)
The same operation as in Example 3 was performed except that the charge transfer apparatus of FIG. 1 was used.

Example 9
The same operation as in Example 3 was performed except that the intermediate transfer device of FIG. 3 was used.

(Example 10)
The same procedure as in Example 3 was performed except that 0.3 mg / cm ² or more of Isopar H was sprayed before the secondary transfer using the intermediate transfer apparatus of FIG.

(Comparative Examples 1-10)
Textile printing was performed in the same manner as in Examples 1 to 10 except that the transfer fabric was not overheated.

Examples 1, 3, 4, 5, 7, 8, 9, 10 and Comparative Examples 1, 3, 4, 5, 7, 8, 9, 10 and 10 using polyester cloth were steamed at 180 ° C. for 30 minutes. A heat treatment was performed, and a printing sample was prepared by treating with sodium carbonate 2 g / L and hydrosulfite 2 g / L for 20 minutes at 80 ° C. warm water.
In Examples 3 and 6 and Comparative Examples 3 and 6 using a cotton cloth, a 2% by weight aqueous solution of sodium bicarbonate was applied to a printed cloth, steamed at 100 ° C. for 15 minutes, allowed to stand for 1 hour, washed with water, A printing sample was prepared by carrying out a treatment at 80 ° C. for 5 minutes with 2 g / L of a surfactant.

  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.

＊濃度はX-Riteにより測定
＊風合は風合段階見本布による
5：布のみと同程度の柔らかさ、4：柔らかい、3：中程度、2：やや硬い、1：硬い
＊平均粒径は島津製作所SA-CP3による
＊解像性は、段階見本による 5：最良、1：最悪
＊転写率はテープ剥離法による濃度から算出

* Concentration is measured with X-Rite * Texture is with textured sample fabric
5: Softness equivalent to cloth only, 4: Soft, 3: Moderate, 2: Slightly hard, 1: Hard * Average particle size with Shimadzu SA-CP3 * Resolution depends on staged sample 5: Best, 1: Worst * Transfer rate is calculated from the concentration by tape peeling method

It is the figure which showed an example of the image forming method of this invention. It is the figure which showed the example which changed the transfer voltage provision member of FIG. 1 from the charger system to the roller system. FIG. 3 is a diagram illustrating an example in which an intermediate transfer member is added to the apparatus of FIG. 2. It is a figure showing an example of an apparatus which arranges a photoconductor in tandem and affixes cloth on a cloth conveyance belt and performs full color printing. It is a diagram showing a method of sandwiching a transfer cloth between a heating roller and a pressure roller like a fixing roller usually used in electrophotography. It is the figure which showed the method of heating a transfer cloth using a belt. It is the figure which showed the method of spraying a hot air like a dryer to heat the transfer cloth.

Claims (14)

In a printing method in which a liquid toner in which a colorant and a resin are dispersed in a carrier solution having a volume resistance of 10 ⁹ to 10 ¹⁶ Ω · cm is printed directly on a printed fabric by electrophotography, the volatile content is 0.1 to 200 mg. An electrophotographic textile printing method using a transfer cloth which is / m ² . In a printing method in which a liquid toner in which a colorant and a resin are dispersed in a carrier solution having a volume resistance of 10 ⁹ to 10 ¹⁶ Ω · cm is printed directly on a printed fabric by electrophotography, the transfer fabric is heated before transfer. And an electrophotographic printing method comprising the step of setting the volatile content to 0.1 to 200 mg / m ² . In a printing method in which a liquid toner in which a colorant and a resin are dispersed in a carrier solution having a volume resistance of 10 ⁹ to 10 ¹⁶ Ω · cm is printed directly on a printed fabric by an electrophotographic method, it is transferred by a heat source at 70 to 160 ° C. An electrophotographic printing method comprising the step of heating the transfer cloth to a volatile content of 0.1 to 200 mg / m ² in advance. 4. The electrophotographic printing method according to claim 1, wherein the colorant of the liquid toner is a dye. The electrophotographic printing method according to claim 4, wherein the purity of the dye is 80 to 100%. 6. The electrophotographic printing method according to claim 4, wherein an alkali-soluble resin or a water-soluble resin is contained in at least a part of the resin. The electrophotographic printing method according to claim 6, wherein the acid value of the alkali-soluble or water-soluble resin is 0 to 2000 mg / KOH. The electrophotographic printing according to any one of claims 1 to 7, wherein the colorant is kneaded or flushed with a water-soluble resin in the presence of humic acid, humic acid salt, or humic acid derivative. Method. 9. The electrophotographic printing method according to claim 4, wherein an average particle diameter of the toner particles of the liquid toner is 0.1 to 5 [mu] m. 10. The electrophotographic printing method according to claim 1, wherein the latent image on the photosensitive member is developed and then transferred by a transfer bias and a pressure by a transfer roller. 11. The electrophotographic printing method according to claim 1, wherein the latent image on the photosensitive member is developed, the toner image is first transferred onto the intermediate transfer member, and then the image is transferred secondarily. The electrophotographic printing method according to claim 11, further comprising a step of spraying a solvent onto the intermediate transfer body before the secondary transfer. The linear velocity of the developing roller for developing the toner is 1.2 to 6 times that of the photosensitive member, and the linear velocity of the squeeze roller for removing excess solvent is 1.2 to 4 times. The electrophotographic printing method according to any one of claims 1 to 12. 14. The electrophotographic printing method according to claim 1, wherein a photoconductor is arranged in a tandem type, and an image is transferred to a cloth affixed on an endless belt and full color printing is performed.

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