JPS596959B2 - Electrostatic printing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic printing method such as an electrophotographic printing method, and particularly to an electrostatic printing method suitable for printing designs on fabrics mainly made of polyester.

Conventionally, methods for printing designs on fabrics include roller printing, screen printing, rotary screen printing, and the like.

However, these conventional printing methods require (a) long preparations before production; print production is based on make-to-stock production; however, if the pattern produced is not popular, large amounts of inventory may be required; Therefore, print production is highly speculative.

(b) Even if we receive information from the market that a certain pattern will sell well, we cannot immediately produce that pattern.

There were drawbacks such as.

In order to solve these drawbacks, electrostatic printing methods such as electrophotographic printing methods have recently attracted attention.

The electrophotographic printing method involves forming an electrostatic latent image corresponding to a design using various conventionally known electrophotographic methods, such as the Carlson method, electrofax method, or Canon NP method, and developing this image with a printing toner. This is a method of printing designs onto fabrics by transferring them onto fabrics, steaming them, soaping them, and drying them.

This electrophotographic printing method differs from the conventional electrophotographic method in which a developed image is transferred onto paper in that it transfers a developed image onto a fabric and dyes it chemically.

For example, textile toners chemically dye fabrics to improve the clarity of designs, fastness to washing, heat fastness to ironing, etc.
Due to the requirement of sunlight fastness, and after transfer, the fabric is subjected to steaming, soaping, and drying processes to dye the fabric with the dye contained in the toner, and conventional paper is used to remove the binder resin of the toner. It is not possible to simply transfer the electrophotographic image to a final image by physically or electrically adhering it to a surface such as the like.

Furthermore, various conditions of the electrophotographic printing method vary depending on the type of fabric to be printed.

Of course, the basic conditions of electrophotography must be met, which is to develop an electrostatic latent image with toner to obtain a high-density, clear image.

Therefore, in order to print a specific type of fabric using the electrophotographic printing method, various conditions must be considered, and it is difficult to find an electrophotographic printing method that satisfies all the optimal conditions for a specific type of fabric. This is extremely difficult.

The present invention provides an electrophotographic printing method suitable for printing designs on fabrics mainly made of polyester.

Furthermore, the present invention provides an electrophotographic printing method capable of printing clear patterns with good dyeability and excellent washing fastness, heat fastness, and sunlight fastness on fabrics mainly made of polyester. It is something.

Furthermore, the present invention provides a clear developed image with high density, has good transferability of this developed image to fabrics mainly made of polyester, has good dyeing efficiency by steaming, and The present invention provides an electrophotographic printing method that is also excellent in removing toner resin components.

That is, the present invention provides (a) a step of developing an electrostatic latent image with a toner containing a disperse dye in a binder resin mainly composed of polyester resin, and (b) a step of developing the developed image on a fabric mainly composed of polyester fibers. The electrostatic printing method is characterized by comprising a step of transferring, (c) a step of dyeing fabrics by steam heat, and (d) a step of removing toner resin from the fabrics.

In the present invention, fabrics mainly composed of polyester fibers include fabrics made of 100% polyester and blended fabrics thereof (
(polyester/cotton blend, polyester/linen blend, polyester/nylon blend, etc.).

Further, as specific examples of the disperse dye of the toner used in the present invention, for example, Resolin Prill Blue PRL, Resolin Yellow PGG, Resolin Pink PRR, Resolin Green PB (hereinafter referred to as Bayer H), Sumikron Blue S-
3RF, Sumikron Red E-EBL1 Sumiklon Yellow E-4GL, (manufactured by Sumitomo Chemical), Diamonds Yellow HG-SE, Diamond X Red BN-SE
, Diamond X Red FL-FS, (manufactured by Mitsubishi Kasei), Kayalon Polyester Yellow YL-SE, Kayalus Supura Blue BRL200, Kayasetsu I/Turkey Blue-776, Kayasetsu Yellow 902, Kayaset Red 912, (and above) , manufactured by Nippon Kayaku), etc. could be preferably used.

Next, various types of polyester resins can be used as the binder resin for the I-ner, but those synthesized from diols and dicarboxylic acids are particularly preferred.

Specific examples of diol components include ethylene glycol, 1,2-glopylene glycol, 1,3
-Propylene glycol, 1,4-butanediol, neopentyl glycol, ■4-butenediol, 1,
Examples include 4-bis(hydroxymethyl)cyclohexane, bisphenol A1, hydrogenated bisphenol A1, and polyoxyethylated bisphenol A.

In addition, examples of dicarboxylic acid components include maleic acid,
Fumaric acid, isophthalic acid, terephthalic acid, cyclohexanedicarboxylic acid, succinic acid, adipic acid, sebacic acid,
Malonic acid, oxalic acid, or their acid anhydrides or esters with lower alcohols are used.

Examples of polyester resins that are preferably usable as toner resins used in the present invention are shown below.

■ Polyester resin (5) Bisphenol A 2.0 mol fumaric acid
Polyester resin synthesized from 2.0 mol, softening point 140°C.

■ Polyester resin (B) Propylene glycol 5.25 mol fumaric acid
Polyester resin synthesized from 5.00 mol, softening point 113°C.

■ Polyester resin (C) Neopentyl glycol 5.00 mol fumaric acid
PolyJ ester resin synthesized from 5.00 mol, softening point 96°C.

■ Polyester resin D) Propylene glycol 5.25 mol Maleic anhydride 2.5 mol Phthalic anhydride
Polyester resin synthesized from 2.5 mol, softening point 110°C.

■ Polyester resin (d) Polyester resin synthesized from 5.25 mol of glopylene glycol and 5.00 mol of maleic anhydride, softening point 92°C.

■ Polyester resin (F'') Polyester resin synthesized from neohentyl glycol 7.35 mol fumaric acid 7.00 mol, softening point 88°C.

■ Polyester Jugetsu WtQ Propylene glycol 2.0 mol Neopentyl glycol 3.15 mol Fumaric acid
Polyester resin synthesized from 5.00 mol, softening point 98°C.

■ Polyester resin ■ Propylene glycol 2.1 mol Neopentyl glycol 3.15 mol fumaric acid
3.32 mol phthalic anhydride
Polyester resin synthesized from 1.68 mol, softening point 98°C.

etc. are typical examples, and can be particularly preferably used in the printing toner of the present invention.

Additionally, chlorinated polyester resins can also be used.

Of course, appropriate amounts of other various resins may be mixed with these polyester resins.

In particular, approximately 2 parts by weight of silicone resin (solid at room temperature) with a molecular weight of 500 to 2000 is added to 100 parts by weight of polyester resin.
A resin binder mixed in a range of 100 parts by weight is particularly preferable and could be used.

It is preferable to use the disperse dye in the binder resin in an amount of about 1.25 to 30% (by weight).

Further, the toner particle size is 1 to 100 .mu.m for dry toner, preferably 5 to 50 .mu.m, and 0.1 to 10 .mu.m, preferably 0.5 to 5 .mu.m for wet toner.

It goes without saying that all conventionally known wet and dry development methods can be applied to the development of the electrostatic latent image in the electrostatic printing method of the present invention, and any method for forming the electrostatic latent image can also be applied. It is clear that there are no limitations.

The steaming step in the present invention is preferably a high-temperature steaming method or a high-pressure steaming method, and the former has a steam pressure of 0.3 to 0.01 k.
g/crA1 It is preferable to process at 170 to 200°C for 1 to 5 minutes.

In particular, it is sufficient to carry out the heating at about 180°C for 3 minutes.

The latter is preferably treated at a vapor pressure of 1 to 3 kg/C4100 to 150°C for 20 to 50 minutes.

For example, 2 kg/crtl, 3 at 1 3 0°C
It is best to do this for 0 minutes.

Next, the toner resin remaining on the polyester fabric after the steaming step is removed by elution and removal using an organic solvent, and methyl ethyl ketone, toluene, xylene, acetone, butyl acetate, trichlene, etc. are preferred, and trichlene is particularly preferred. It was the best.

EXAMPLES The present invention will be specifically explained below with reference to Examples, but these are not intended to limit the present invention in any way.

(All numbers in Examples are parts by weight.

) Example 1 Polyester resin (manufactured by Kao Soap Co., Ltd., 350 parts, product name, Atrac 382A) Silicone resin (manufactured by Shin-Etsu Chemical, commercial product name, 50 parts name, KR
-220) Disperse dye (manufactured by Nippon Kayaku Co., Ltd., trade name, 20 parts Kayaset Turkey Blue-776) After mixing the resin and dye having the above composition, the mixture was milled at 160°C for 10 minutes using a roll mill.

This kneaded material was roughly pulverized and then finely pulverized using a supersonic jet pulverizer to obtain a printing toner.

Add 130 parts of this toner to carrier iron powder (product name: EFV).
250/400, manufactured by Nippon Tetsuko Co., Ltd.) to prepare a developer.

Next, the positive electrostatic latent image was developed using this developer by the fur brush method, and the resulting image was spread on a polyester cloth (trade name, Teijin Tetron ■, manufactured by Teijin, 100% polyester).
) and steam-heated.

The steaming was performed using a high-pressure steaming model SS-2 manufactured by Tsujii Senko Kogyo at a steam pressure of 2 kg/cr7t and 130°C for 30 minutes.

Next, the toner binder was washed away by washing with trichlene for 1 minute, and a clear blue printed pattern was obtained by washing with a soap solution.

As a comparative example, in Example 1, the polyester resin in the toner was replaced with styrene resin (Comparative Example 1) and (Comparative Example 2).
) Epoxy resin, (Comparative Example 3) Polymethyl methacrylate was used.

The respective dyeing rates are shown in the table below. Example 2 A toner was produced in exactly the same manner as in Example 1, except that the disperse dye in the toner was changed to Kayaset Yellow 902 (trade name, manufactured by Nippon Kayaku), and development and transfer were performed.

Next, the steaming conditions were set using a high-temperature steaming type HT-steamer HT-3 model manufactured by Tsujii Someki Kogyo Co., Ltd., with a steam pressure of 0. 0 2 5 k
Steam treatment was performed at 180° C. for 3 minutes at 180 g/crtt.

The rest was carried out in the same manner as in Example 1, and a clear yellow printed pattern was obtained.

Example 3 A developer was prepared in the same manner as in Example 1 using the above resin and dye.

The electrostatic latent image is developed with this developer, and the image is transferred to polyester cloth (trade name: Kanebo Polyestero 4, manufactured by Kanebo Co., Ltd., 100% polyester), and the vapor pressure is 1. 9 ky/
crtt, and steam treatment was performed at 135° C. for 40 minutes.

The rest was carried out in the same manner as in Example 1, and a clear red printed pattern was obtained.

Example 4 In Example 1, 2 or 3, the polyester resin of the printing toner was polyester resin (B) ~■ described in the specification.
Similarly, a clear printed pattern was obtained by changing the method to

Further, the same procedure was carried out by changing the dye of each Example to each of the disperse dyes listed in the specification, and clear printed patterns were obtained in all cases.

Example 5 The toner 101 of Example 3 was mixed with isoparaffin hydrocarbon (
(trade name: Isopar H, manufactured by Esso) was dispersed in 1 liter to prepare a liquid developer.

The electrostatic latent image was developed using this developing solution, and the image was transferred to a blended fabric of 80% polyester/20% cotton (manufactured by Teijin, Y-shirt material) at a vapor pressure of 0. 0 2 5 kg/cni, 170
Steaming treatment was performed at ℃ for 4 minutes.

Next, the toner resin was washed with methyl ethyl ketone for 1 minute, and then washed with a 1% surfactant solution (manufactured by Kao Soap Co., Ltd., trade name, Zabu).

A vivid red printed pattern was obtained.

Claims (1)

[Claims] 1 (a) developing an electrostatic latent image with a printing toner containing a disperse dye in a binder resin containing polyester resin as a main component; (b) developing the developed image with a printing toner containing a disperse dye as a main component; (C) A process of dyeing the fabric by steam heat, (d)
An electrostatic printing method characterized by having a step of removing toner resin from a fabric. 2. The electrostatic printing method according to claim 1, wherein the binding resin of the printing toner is a polyester resin and a silicone resin. 3. The electrostatic printing method according to claim 1 or 2, in which the printing toner contains 1.25 to 30% (by weight) of a disperse dye in a binder resin mainly composed of polyester resin. 4. Printing The electrostatic printing method according to claim 1, 2 or 3, wherein the polyester resin of the toner is synthesized from diol and dicarboxylic acid. 5. The steaming step is a high temperature steaming method or a high pressure steaming method. An electrostatic printing method according to claim 1.