JPS59198187A - Recording material - Google Patents

Abstract

PURPOSE:To provide a recording material for ink jet recording excellent in color forming property of an ink, high in resolution and excellent in both water resistance and light resistance, wherein a specified quarternary ammonium hydroxide is incorporated in a base or a coated layer provided on the base. CONSTITUTION:A quarternary ammonium hydroxide of the formula, wherein each of R1-R4 is alkyl such as methyl, ethyl or dodecyl, an alcohol or ether such as 2-hydroxyethyl or polyoxyethylene or an aromatic group such as benzyl, e.g., tetra(2-hydroxyethyl)ammonium hydroxide, is incorporated into the base in a paper-making step or the like, preferably, in a quantity of 0.05-2% in the form of an aqueous 0.05-2wt% solution, or the compound of the formula is added to a coating liquid, preferably, in a quantity of 0.03-5% and the coating liquid is applied to the base, preferably in a quantity of 2-30g/m<2> (by dry weight), to obtain the objective recording material. EFFECT:An ink is speedily absorbed into the inside part of the recording medium, and flow-out or exudation of a recording liquid does not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording material (recording paper) used in an inkjet recording method, and particularly to a recording material that has excellent ink coloring properties and forms a high-resolution, water-resistant recorded image. .

Methods of recording using recording liquid have been common for a long time, such as writing with a fountain pen, but recently,
A so-called inkjet recording method has also appeared, and recording liquid is used here as well.

The inkjet recording method generates small droplets of recording liquid using various operating principles, and performs recording by making them fly and adhere to recording materials such as paper, but it produces less noise and can print at high speed. , is attracting attention as a recording method that allows multicolor printing. Water-based recording liquids are mainly used for inkjet recording in terms of safety and printability.

As the recording material used in this inkjet recording method, conventional paper has generally been used. but,
As the performance of inkjet recording machines improves, such as faster recording and multicolor recording, recording materials for inkjet recording are also required to have more advanced properties.

In other words, in order to obtain high-resolution and high-quality recorded images comparable to color photography, the recording material must: (1) absorb ink as quickly as possible;
2) When ink dots overlap, the ink that adheres later does not flow onto the previous dot, (3) the diameter of the ink dot does not become larger than necessary, (4) the shape of the ink dot is close to a perfect circle, In addition, the ink must meet various requirements such as the surrounding area being smooth, (5) the density of the ink dot being high and the area around the dot not being blurred, and (6) the ink having excellent color development. is required.

However, the reality is that a recording material that satisfies all of these required performances has not yet been found. For example, JP-A-52
The inkjet recording paper described in No. 74,304 absorbs ink quickly, but has the disadvantages that the dot diameter tends to become large, the periphery of the dots tends to become blurred, and the size of the paper changes significantly after recording. have.

On the other hand, since the inkjet recording method uses water-based ink, there is a problem that the recorded image lacks water resistance, and the ink becomes illegible when exposed to water, and there is a need to solve this problem. was.

For example, the inkjet recording paper described in JP-A-56-99693 contains quaternary ammonium halide to impart water resistance. However, such water-resistant inkjet recording paper has the disadvantage that the light resistance of recording 4A (dye, etc.) is significantly reduced. This probably occurs because the photolysis of the dye is promoted by the precatalytic action of the halogen.

An object of the present invention is to provide a recording material for inkjet recording that satisfies the above-mentioned requirements and has particularly excellent water resistance and light resistance.

Another object of the present invention is to provide a recording material for inkjet recording that improves the color development of ink and has excellent color properties.

The above and other objects are achieved by the invention as follows.

That is, the present invention provides a base material or a coating layer provided on a base material having the formula (D (wherein, RI+ R2, R8, R4 are alkyl groups such as methyl group, ethyl group, dodecyl group, 2 - an alcohol group such as a hydroxylpool group, a polyoxyethylene group, an ether group, an aromatic group such as a benzyl group, etc.). This is a recording material for inkjet.

On the other hand, the base material of the recording material of the present invention is typically paper, but cloth, resin film, synthetic paper, etc. can also be used as the base material.゛The method for manufacturing the recording material of the present invention by incorporating quaternary ammonium hydroxide represented by formula (I) into the base material is as follows:
For example, there is a method of making paper using an aqueous solution of quaternary ammonium hydroxide in the papermaking process, or a method of post-treatment in which the quaternary ammonium hydroxide is added to an impregnating solution and the substrate is immersed in it. You may also use this method. In these cases, the optimum concentration of the quaternary ammonium hydroxide aqueous solution varies depending on the viscosity of the aqueous solution and the solubility of the quaternary ammonium hydroxide, but generally it is 0.
．． It is appropriate to use a material within the range of 0.05 to 2 weight ratio. In addition, the amount of quaternary ammonium hydroxide to be contained in the base material is suitably in the range of 0.05 to 2% by weight relative to the base material, and if the amount of quaternary ammonium hydroxide is too large, This is not preferable because ink absorption decreases.

On the other hand, for the recording side of the present invention of the type containing quaternary ammonium hydroxide (I) in the coating layer on the base material, quaternary ammonium hydroxide is added to the coating liquid, and the coating liquid is coated with quaternary ammonium hydroxide. It is manufactured by coating the material on a substrate and drying it. As other components of the coating liquid in this case, various conventionally known components may be added, such as finely divided silicic acid, clay, talc, diatomaceous earth, calcium carbonate, calcium sulfate, barium sulfate, titanium oxide, titanium oxide, etc. Zinc, Sachin Why 1-,
Inorganic pigments such as aluminum silicate and lithopone; Water-soluble polymers such as starch, gelatin, casein, gum arabic, alginate sorter, carboxymethyl cellulose polyvinyl alcohol, polyvinylpyrrolidone, and sodium polyacrylate; Synthetic resin latex such as synthetic rubber latex : Organic solvent soluble resin such as polyvinyl butyral and polyvinyl chloride; Furthermore, dispersant fluorescent dye, P
Examples include various additives such as H regulators, antifoaming agents, lubricants, preservatives, and surfactants.

The amount of quaternary ammonium hydroxide added to the coating solution is suitably in the range of 0.03 to 5 parts by weight.

The coating liquid is usually applied in an amount of about 1 to 50 m'' (dry coating amount) onto the substrate by a known method (e.g., roll coater method, blade coater method, air knife coater method). The coating rate is preferably about 2 to 30 ji/m. (dry coating amount).

The recording material of the present invention, which contains quaternary ammonium hydroxide represented by the formula (1) in the base material or the coating layer provided on the base material in this way, allows the ink to quickly enter the inside of the recording material. Even when different-colored recording liquids are absorbed and adhered to the same spot repeatedly within a short period of time, there is no phenomenon of the recording liquid flowing out or seeping out, and a clear image with high resolution is provided. Moreover, it exhibits excellent properties in both water resistance and light resistance, making it suitable as a recording material for inkjet recording.

Hereinafter, the present invention will be explained in more detail according to Examples and Comparative Examples.

Example 1 A coating composition was prepared based on the following composition using tetoxy-2-hydroxyethylammonium hydroxide as quaternary ammonium hydroxide.

Finely divided silicic acid 100 parts by weight Polyvinyl alcohol 50 Tet-2-hydroxyethyl 1,7 ammonium hydroxide water 50Q
//On the other hand, as a base material, general high-quality paper (basis weight 65 g/m
), the above-mentioned coating composition was coated onto this substrate by a blade coater method at a dry coating weight of 15 g/m', and dried by a conventional method to obtain a recording material. Ta.

Color inkjet recording was performed on this recording material using the following four color inks, and the recording characteristics were evaluated.

Yellow ink (composition) c. r. Acid Yellow 23 2 parts by weight diethylene glycol 30 Water
70 Magenta ink (
Composition) C. 1. Acid Red 35 2 parts by weight diethylene glycol 30 Water
70 〃Cyan ink (
Composition) C. 1. Direct Blue 86 2 parts by weight diethylene glycol 30 Water
70 Black ink (composition) C. 1. Direct Black 19 2 parts by weight diethylene glycol 30 parts by weight water
70/Table 1 shows the evaluation results of the recording characteristics of the recording material.

The degree of bleeding was determined by measuring the diameter of a printed dot using a stereomicroscope, and expressed as how many times larger the diameter of the printed dot was than that of an ink droplet. For color development, optical density (0.D.) was measured using a Macbeth densitometer.

Water resistance was evaluated by immersing the recording material in running water for 1 hour and comparing the optical density (0.D.) measured using a Macbeth densitometer after immersion with the OD value before immersion.

In addition, the light resistance was measured by irradiating with a xenon fade meter for 100 hours and using a colorimeter ND-1001-DP (manufactured by Nippon Teishoku Kogyo ■) to determine the color difference (Hunter ΔE) from the unirradiated one.
I asked for

Example 2 An aqueous solution of cetyltrimethylammonium hydroxide as quaternary ammonium hydroxide was prepared, and general paper (basis weight 70 17 m') with a size degree of 0 seconds was immersed in it,
After drying, a recording material impregnated with cetyltrimethylammonium hydroxide in an amount of about 0.5 weight percent based on the base material was obtained. Table 1 shows the results of evaluating this recorded material 41 in the same manner as in Example 1.

Comparative Example 1 A recording material was prepared in the same manner as in Example 1, except that tetra-2-hydroxyethylammonium hydroxide was not added to the coating composition. The recording characteristics were evaluated in the same manner as in Example 1, and the results are shown in Table 1.

Comparative Example 2 The base material used in Example 2 was used as a recording material without any treatment. The recording characteristics were evaluated in the same manner as in Example 1, and the results are shown in Table 1.

Comparative Example 3 Example 1 except that lauryltrimethylammonium chloride was used in place of the tetra-2-hydroxyethylammonium hydroxide used in Example 1.
A recording material was prepared in the same manner as described above. Recording characteristics are as in Example 1
It was evaluated in the same manner as above, and the results are shown in Table 1.

Claims (1)

[Claims] The base material or the coating layer provided on the base material has the formula (1) (wherein R1
+ R2+ R8+ R4 is an alkyl group such as a methyl group, an ethyl group, a dodecyl group, an alcohol group such as a 2-hydroxyethyl group or a polyoxyethylene group, an aromatic group such as an ether group or a benzyl group, etc.) An inkjet recording material comprising quaternary ammonium hydroxide as shown below.