JP2000052640A - Ink jet recording medium and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a definite and shape printing having weatherability withstanding outdoor use by using a fabric formed of yarn having a porous substance existing between filaments forming the yarn or on the surface thereof to form an ink jet recording medium. SOLUTION: There is used fabric formed of yarn having a porous substance existing between filaments forming the yarn or on the surface thereof for forming an ink jet recording medium. In this case, yarn is suitable to be multifilaments, and fabric formed of yarn may be any of woven fabric, knitted fabric and nonwoven fabric. As fiber material, synthetic fiber and natural fiber may be used, and as concrete examples, there are given cotton, silk, wool, polyester fiber, acryl fiber, polyamide fiber, and the like. The porous substance has an effect to make up for ink absorptiveness in recording by an ink jet recording method, and suitable to be particles having an average particle size of 0.1-30 μm, as concrete examples, there are given inorganic substances such as silica and alumina.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ink jet recording medium and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, when dyeing a cloth, various dyes or pigments are impregnated or adhered to the fiber, and then fixed by using a steam heat treatment or a chemical method. In recent years, means capable of attaching ink to a medium with high accuracy, such as an ink jet printer, have appeared. However, when the ink was adhered to a normal cloth by such means, the ink was easily diffused and a clear image could not be obtained.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fabric-based ink jet recording medium which can be printed finely and clearly and has weather resistance which can be used for outdoor applications. .

[0004]

According to the present invention, there is provided an ink jet recording medium comprising a fabric comprising a yarn in which a porous substance is present between single fibers forming the yarn or on the surface of the yarn.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the yarn is preferably a multifilament yarn. The fabric formed from the yarn may be any of a woven fabric, a knitted fabric, and a nonwoven fabric.

[0006] The fiber material is not particularly limited, and synthetic fibers or natural fibers can be used. Specifically, cotton, silk, hemp, wool, polyester fiber, acrylic fiber,
Examples include polyamide fibers, rayon fibers, acetate fibers, and polyimide fibers. Among them, polyester fibers are preferable because they have good dimensional stability against temperature and humidity.

When a polyester fiber is used as a fiber material, a multifilament yarn composed of a collection of straight and parallel fine fibers contains a large amount of a porous substance in order to obtain an ink jet recording medium having high ink absorption. Need to be done. On the other hand, a processed yarn obtained by subjecting a multifilament yarn to crimping or loop processing is preferable since it has good ink absorbency. In addition, since the cationic dyeable polyester fiber has a good adsorptivity of the porous substance and a yarn in which the porous substance is uniformly distributed can be obtained,
This is preferable because a clear image without blurring can be obtained as compared with ordinary polyester fibers.

[0008] The porous substance has the effect of supplementing the ink absorbency when recording by the ink jet method. That is, it has a function of receiving the ejected ink and fixing the dye mainly to form a color as an image. The porous substance is
It is preferable that the particles have an average particle diameter of 0.1 to 30 μm. If the average particle size is less than 0.1 μm, the absorbency becomes insufficient, which is not preferable. Average particle size is 30μ
If it exceeds m, it is not preferable because uniform coating becomes difficult. The porous material preferably has an oil absorption of 0.1 cm ³ / g or more.

As the porous substance, any of inorganic and organic substances can be used. Examples of the inorganic substance include silica, clay, alumina, calcium carbonate, and titanium oxide. As organic substances,
Cellulose. These porous substances are preferably in a state where porous particles are bound with a binder. As the binder, polyvinyl alcohol,
An ethylene-vinyl acetate copolymer, an acrylic resin, a urethane resin and the like are preferred. The ratio of the porous particles to the binder is such that the binder is 5 to 3 parts per 100 parts by weight of the porous particles.
It is preferably 00 parts by weight (dry solids).

When the porous particles are silica and the binder is polyvinyl alcohol, the amount of polyvinyl alcohol is particularly preferably 5 to 50 parts by weight based on 100 parts by weight of silica. When the porous particles are silica and the binder is an acrylic resin, the amount of the acrylic resin is preferably 50 to 200 parts by weight based on 100 parts by weight of the silica.

In order to allow a porous substance to be present between the single fibers forming the yarn or on the surface of the yarn, it is preferable to impregnate the yarn with a dispersion containing the porous substance and a binder and then form a woven or knitted fabric. As the impregnation method, a dipping pot, a foam, a roller applicator, or a spray can be used, and thereafter, generally dried at 60 ° C. or more,
Deposit as a uniform coating on the fibers. The porous material is preferably applied at a coating amount of 0.01 to 0.5 g / g of fiber. Coating amount 0.01 g / fiber 1
When the amount is less than g, the fixability and the absorbability of the dye become insufficient, and clear and high-density recording may not be performed. A coating amount of more than 0.5 g / g of fiber is not preferable because not only is the material unnecessarily consumed, but also the texture of the substrate may be impaired. A more preferable range of the coating amount is 0.05 to 0.3 g / g of fiber.
It is.

The use of boehmite as the porous substance is particularly preferred because of its good ink absorbency and good color development. Boehmite is Al ₂ O ₃ .nH ₂ O (n = 1 to
1.5) a crystal represented by the formula, the surface of which is cationic,
The dye in the ink is adsorbed very strongly, with good dispersibility, and homogeneously. Further, the aggregate particle diameter of the boehmite particles is 50 to
By controlling the wavelength to 200 nm, light scattering is reduced, the color of the dye is very high in both the density and the saturation, and a clear image without turbidity is obtained.

In the case of using boehmite, as the binder, organic substances such as starch and denatured substances thereof, polyvinyl alcohol and denatured substances thereof, SBR latex, NBR latex, carboxymethylcellulose, hydroxymethylcellulose and polyvinylpyrrolidone can be used. The amount of binder used is Boehmite 100
The binder is preferably 5 to 50 parts by weight based on parts by weight. If the amount of the binder is less than 5 parts by weight, the adhesion strength of boehmite may be insufficient, which is not preferable. If the amount of the binder exceeds 50 parts by weight, the ink absorbency and the dye fixability may be insufficient, which is not preferable.

In the present invention, when a cationic resin is present together with the porous substance, the effect of adsorbing the dye is further increased, and a clear image having a higher color density can be obtained. Further, the cationic resin also has an effect of improving the water resistance of the dye.

Examples of the cationic resin include a polyethyleneimine resin, a polyamide resin, a polyamine resin, a reaction product of a low-molecular weight polyfunctional amine and a polyfunctional compound with respect to an amino group such as epihalohydrin, and an acrylamine copolymer resin (primary resin). (Quaternary ammonium salt polymer), polyamide epichlorohydrin resin, or a modified product of these resins.

When a cationic resin is used, the water resistance can be further improved by using a high molecular weight resin, for example, by using a polyethyleneimine having a molecular weight of 10,000 or more. Water resistance can also be improved by crosslinking. As a means of crosslinking, a method of adding a thermosetting resin such as a urea resin, a melamine resin, a polyamide resin, or an epoxy resin to a cationic resin such as polyamine or polyethylene imide, or a method such as polyester acrylate, polyether acrylate, or urethane acrylate. There is a method of adding and curing an electron beam or ultraviolet curable resin.

The cationic resin layer is preferably formed by impregnating a fiber material with porous particles and then impregnating a liquid in which the cationic resin is dispersed in an appropriate solvent.
Alternatively, it can be internally added to the porous particles in advance.

In the case of a recorded matter obtained by recording with an ink jet printer on a recording medium made into a cloth using the fibers impregnated with the porous particles, the surface of which is coated with a transparent or translucent resin, In addition, the weather resistance and scratch resistance of the recorded matter can be remarkably improved.

In the present invention, other substances can be added to the yarn together with the porous particles. For example, by adding succinic acid, it is possible to prevent the porous substance from adsorbing organic substances in the atmosphere and discoloring.

After recording on the recording medium of the present invention, by coating the surface with a resin or the like, it is possible to obtain a recorded article having further excellent durability.

[0021]

EXAMPLES Example 1 Boehmite sol containing boehmite aggregated particles as sol particles (solid content concentration 18% by weight, aggregated particle diameter 150 nm)
And polyvinyl alcohol (degree of saponification 96.5%, 4
A weight% aqueous solution having a viscosity of 65 cps, manufactured by Shin-Etsu Chemical Co., Ltd., trade name MA26) and succinic acid were mixed at a ratio of 100: 6: 2 by weight, respectively, to give a total solid concentration of 1%.
A 0 wt% boehmite coating solution was prepared. This silica coating liquid was impregnated into a cationic dyeable polyester yarn (200 denier) using an immersion pot. The contact time with the coating liquid was set to 10 seconds, and then the coating liquid was continuously dried at 120 ° C. The yarn having the boehmite porous particles between the single fibers thus obtained was converted into a woven fabric having a basis weight of 170 g / m ² .

Example 2 Before impregnating the boehmite sol, except that the fiber was treated with a 5% by weight aqueous solution of a cationic resin (water-soluble polyamide resin, Sumitomo Chemical Co., Ltd., trade name: Sumitex Resin AR-5). Was a woven fabric in the same manner as in Example 1.

Example 3 (Comparative Example) The yarn used in Example 1 was used as a woven fabric without being impregnated with boehmite sol.

Printing Example Printing was performed on the recording medium made of the woven fabric obtained in Examples 1 to 3 using an inkjet printer (manufactured by Seiko Epson Corporation, PM700C) in four colors of cyan, magenta, yellow, and black. Table 1 shows the results of visually evaluating the image quality. In Table 1, those with very good image quality are indicated by ◎,
Good was evaluated as 、, slightly good as Δ, and poor as ×. The woven fabric of Example 3 was dark in color and had a whitish image quality.
Next, in order to evaluate the water resistance, the printed recording medium was immersed in still water for 4 hours, and the degree of magenta bleed was visually observed, and the same relative evaluation was shown. The color density was measured before and after immersion, and the value of the color density after immersion with respect to the color density before immersion was determined.

[0025]

[Table 1]

[0026]

According to the recording medium of the present invention, clear recording can be performed by an ink jet printer, and a color image can be easily formed. Also, it is easy to create a large area recording medium,
An inkjet recording medium that can be used for an advertising sign, a flag, a tapestry, and the like can be obtained.

Claims (3)

[Claims] 1. An ink jet recording medium comprising a fabric comprising a yarn having a porous substance between single fibers forming the yarn or on the surface of the yarn. 2. The ink jet recording medium according to claim 1, wherein a cationic resin is present together with the porous substance. 3. A method for producing a woven or knitted fabric after impregnating a dispersion containing a porous material and a binder into a yarn, wherein the porous material is formed between single fibers forming the yarn or on the surface of the yarn. A method for producing an ink jet recording medium made of a fabric composed of yarns having the following.