JPS5935977A - Recorded material - Google Patents

Abstract

PURPOSE:To obtain a material to be recorded with a high ink absorptivity and an excellent color forming property by providing a covered layer on the surface of a support so that irregular forms of particles of the filler appear on the surface thereof. CONSTITUTION:100pts.wt. of a filler such as silica with the particle size of 1-30mum is blended with 10-100pts.wt. of a binder (e.g. PVA) and a dispersant, a fluorescent dye, a pH adjusting agent, a defoaming agent, a lubricant, a preservative, a surfactant and the like as required and dispersed into a medium such as water to obtain a coat liquid. Then, the coat liquid is applied on a support such as paper in the range of 1-50g/m<2> and dried as quickly as possible to form a covered layer on the surface of which irregular forms of particles of the filler appear. This eliminates possible oozing out and exudation of recording liquids of different color even when attached overlapping at the same position within a short period thereby ensuring a clear picture with a high resolution.

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 high ink absorption and excellent ink color development.

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 ink-side recording from the viewpoint 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, high-quality recorded images, the recording material for inkjet recording must: 1) absorb ink as quickly as possible; 2) be able to absorb ink as quickly as possible; 3) The diameter of the ink dot should not be larger than necessary; 4) The shape of the ink dot should be close to a perfect circle and the surrounding area should be smooth; 5) The a degree of the ink dot It is necessary that the dots have a high height, that the area around the dots is not blurred, and that it satisfies the required performance of the shade.

In order to achieve a recording image quality of 1■ that is comparable to the power Rari J' page using the multicolor ink chef I/recording Jj method, L
In addition to the required performance listed above, 6) White color must be 1 bar or higher.

7) R of the ink: The color development of the tw component must be impaired.

8) Due to the color of the ink, the same number of small ink droplets may overlap and seal at the same location, so the ink absorption f1 is 45.
The performance of the elephant is weighted and required.

However, the reality is that there is still no recording material that meets all of these required performances.For example, the Ink Chef I recording paper described in JP-A-52-74-304 is Although absorption is rapid, it has the drawbacks that dots tend to become large, the periphery of donts tends to become blurred, and there is a large change in ζJ (ζJ) after recording.

The object of the present invention is to provide a full-color ink chef + recording material that satisfies the above-mentioned requirements, and in particular has high ink absorption and excellent color development. It is in.

These and other objects are achieved by the present invention as described below.

That is, the present invention provides a recording material in which a coating layer containing a filler and a binder is provided on the surface of a support, in which irregular particle shapes of the filler appear on the surface of the coating layer. It is a recording material for recording.

The recording material of the present invention is characterized by the unique surface state of the coating layer that functions as a recording liquid receiving layer.

That is, amorphous filler particles with a relatively large particle size, which are one component of the coating layer, appear on the surface of the coating layer in a randomly placed state, and function as ink absorption holes between these particles. It has a structure in which many large voids are scattered, and a typical state is shown in FIG. Of course,
These filled IMj material particles that appeared on the surface are also ak? due to the binding agent. It is fixed within the 'a layer and does not easily separate from the coating layer. FIG. 1 is a scanning electron micrograph of the surface of the coating layer of the recording material of the present invention, magnified approximately 1,500 times, and clearly shows the surface condition 7fi4, which could be described as having debris of various sizes scattered. ing.

Figure 2 is a photograph at the same magnification of the surface of the recording medium 44 having a conventional limb covering layer. These Table 1111 are clearly distinguished from the recording material of the present invention, which has a large number of micropores that serve as recording liquid absorption holes, and whose coating layer has a surface structure of ilZ JLj.

As described above, on the surface of the coating layer of the recording material of the present invention, there are large and numerous voids between the filler particles that serve as the ink absorption fL. It is quickly absorbed into the gaps and has a large ink absorption capacity.

As the support for the recording material of the present invention, it is appropriate to use paper, but cloth, resin film, synthetic paper, etc. can also be used.

- The coating layer of the recording material of the present invention is basically composed of filler particles and a binder. The filler particles include, for example, silica, clay, talc, diatomite, calcium oxide, calcium sulfate, barium sulfate, titanium oxide, zinc oxide, zirconium oxide, aluminum silicate, lipoton, alumina, zeolite, etc. white inorganic pigments; examples include organic powders such as ion exchange resin powders and plastic pigments, and one or more of these are used.The irregular shape of filler particles on the surface of the coating layer causes debris to be scattered. In order for this to appear, the particle size of the filler particles used should be between 1 and 30μ, more preferably between 3 and 20μ.
It is desirable that the number is about 11. If the particle size of the filler particles is too large, the roundness of the ink dots will be impaired and the resolution of the recorded image will be reduced, which is not preferable.

The higher the dye adsorption ability of the filler particles, the more preferable they are, and it is more preferable that they have a porous structure. This is because the force of the pigment in the ink absorbed into the gaps between the filler particles being captured by the outermost layer of the recording material results in good color development.

Another force, the binding material and 1. Water-soluble polymers such as starch, gelatin, casein, gum arahia, alkinoic acid sorta, calhoquinomethylcereulose, polyvinyl alcohol, polyvinylpyrrolidone, polyacrylic acid sorta, polyacrylamide, etc.: Synthesis of latex, etc. Resin latex, polyhinyl butyral, polyvinyl chloride, polyhinyl acetate, polyacrylonitrile, volumetric methacrylate-1, polyvinyl alcohol, melamine resin, polyamide resin, phenol resin, polyurethane resin, alkynd resin, etc. Organic solvent t1 (soluble resin) In addition, various additives such as a dispersant, a -i fluorescent dye, a PHA stabilizer, an antifoaming agent, a lubricant, a VJ preservative, and a surfactant f/1 agent are mixed in the coating layer. You can also do that.

The recording material of the present invention is prepared by adding coating layer components to 11 parts in a medium such as water and applying a coating solution to roll coat T.
, 1 ink I); , rod percoat ink method, sub 1.
・-Coating 1 person, coat the support 1- by an air knife coating method, etc., and then dry it as soon as possible (can be manufactured by drying. Filler particles and binder in the coating solution With a mixing ratio of 17 and 17, filler particles generally
It is appropriate for the binder to be 10 to 100 parts by weight per 0 parts by weight, and when the average particle size of the filler particles is large, good results are obtained by using as little binder as possible. . The sleeve of the coating layer of the support is usually 1 to 50 g/'
A string of about +η' (dry coating) is placed on the base material. Moreover, preferably about 2 to 30 g/m' (dry coating amount) is 4 pieces.

The recording material of the present invention, in which the support is provided with a coating layer having a unique surface condition, has extremely high ink absorbency, and recording liquids of different colors overlap in the same place within a short period of time. Even if the recording liquid adheres to the recording medium, there is no flow-out or oozing phenomenon of the recording liquid, and a high-resolution, clear image can be obtained. Furthermore, it exhibits excellent properties in terms of color development, making it perfect for full-color recording! - Suitable as a recording material for recording.

In the following, the present invention will be explained in more detail according to Examples.

Example 1 Psil E150, trade name, 11 pieces of Sorikani Gyo Co., Ltd. V, ・V average particle diameter: 5μ) were added to silica as filler material particles.
using polyvinyl alcohol and SBR as a binder.
A composition for coating 1 was prepared using latex based on the following composition.

Silica 100 parts by weight Polyvinyl alcohol 25 ttSBR latex
5 tt water
500 tt On the other hand, as a support) ~ body,
General high-quality paper (65 g/'rn' per tsubo) with a sizing degree of 35 seconds based on JIS P8122 was used, and a dry coating composition of 1-, 1-, and 1-[15 g/m'] was applied to this support at a dry coating rate of 15 g/m'. A recording material was obtained by coating with a B1/-F coater method and drying by a conventional method.

FIG. 1 shows a scanning electron micrograph of the surface of the coating layer of the recording material obtained, magnified approximately 1,500 times.

Color ink dien t□ recording was performed on this recording material using the following four color inks, and the 3f' value of the recording characteristics was expressed as 'Ir'.

Yellow ink (composition) C, 1, acid yellow 23 2 parts by weight diethylene glycol 301/water 7Q
//Magenta ink (composition) □ C, 1, Anrad Red 92 2 parts by weight diethylene glycol 3Q tt water
70/l cyan ink (
Composition) c, r Direct Blue 86 2 parts by weight diethylene glycol 301/water
7Q tt black ink (composition) C, 1, Tirect black 19 2 parts by weight diethylene glycol 301/water 70
//Table 1 shows the evaluation results of the recording characteristics of the recording material.

l) The dot density was determined by measuring printed dots using a Sakura microdensitometer PDM-5 (manufactured by Konishiroku Photo Industry Co., Ltd.).

2) To determine the shape of the printed dots, observe the printed dots with a stereoscopic microscope.
Irregular shapes were marked as ×.

3) The degree of bleeding is measured directly from the printed dot (with a stereomicroscope).
l+'')i:' Indicated by whether the amount is the same as that of Inktropre!・.

4) Color clarification is as follows: - The sharpness of the color of the recorded image of f-n-cushette is determined by [1 boat, the best one is O, the worst one is ×, and is ranked as ■, ○, △, ×. Did.

5) Regarding the ink absorption, when four colors of ・C ink were used for recording, the ・R ink did not run out and the image was clear, and the ink absorbency was evaluated as ○, and the others as X.

Table 1 shows the evaluation results of the recording characteristics of the recording material.

Example 2 A coating composition was prepared based on the following composition using filler particles and calcium carbonate (average particle size: 3 mm) and starch and SBR Latinx as binders.

Calcium carbonate 100 parts by weight Starch 3 oll SBR latex lO/l water
300 ttMeanwhile,
As the support, the same general high-quality paper as in Example 1 was used,
A dry coating amount of 20 g of the above coating composition was applied to this support.
/rn' by a blade coater method and dried by a conventional method to obtain a recording material.

Table 1 shows the results of evaluating this recording material in the same manner as in Example 1.
Shown below.

Example 3 A coating composition was prepared based on the following composition using talc (average particle size: 7μ) as filler particles and casein as a binder.

Talc 100 parts by weight Casein 20 tt water
500 tt On the other hand, the same general coating as in Example 1 was used as the support, and the above coating composition was dry coated on the support using a blade coater at a rate of 20 g/rn'. A recording material was obtained by coating and drying by a cutting method. This recording material was evaluated in the same manner as in Example 1, and the results are shown in Table 1.

Comparative Example 1 The inkjet recording characteristics were evaluated in the same manner as in Example 1, using a commercially available art coat: SK coat, manufactured by Jikaku Kokusaku Pulp Co., Ltd., as a recording material. The results are shown in Table 1. A scanning electron micrograph of the surface of the coating layer of this paper at a magnification of approximately 1500 times was as shown in FIG. 2.

[Brief explanation of the drawing]

1'', approximately 750 mm on the surface of the coating layer of the recording material of the present invention.
0x scanning! (It is a microscopic photograph of !tun fWJ, and Fig. 2 1
This is a photomicrograph of the surface of commercially available Artco I paper at the same magnification. i/Figure 2

Claims (1)

[Claims] 1. A recording material in which a coating layer containing a filler and a binder is provided on the surface of a support, characterized in that irregular particle shapes of the filler appear on the surface of the coating layer. A recording material for inkjet recording.