JPS59198188A - 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 quarternary compound of polyethyleneimine is incorporated in a base or a coated layer provided on the base. CONSTITUTION:A quarternary compound (preferably, having a conversion to quarternary compound of 10-50%) of polyethyleneimine (preferably, having a molecular weight of 5,000-10,000) is incorporated into the base in a paper-making step or the like, preferably in a quantiy of 0.05-2wt%, or the quarternary compound is added to a coating liquid, preferably in a quantity of 0.03-20% and the liquid is applied to the base, preferably, in a quantity of 2-30g/m<2> (by dry applied weight), to obtain the objective recording material. EFFECT:An ink is speedily absorbed into the inside part of the recording material, and even when recording liquids of different colors are adhered overlappingly to the same part in a short time, flow-out or exudation of the recording liquids 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. It is attracting attention as a recording method that allows printing and multicolor printing.Water-based recording liquids are mainly used for inkjet recording from the standpoint of safety and printability.

As a recording material used in this inkjet recording method, i-car conductor paper has conventionally been generally used. However, 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.

On the other hand, since the inkjet recording method uses water-based ink, there is a problem that the recorded images lack water resistance, and when exposed to water, the ink bleeds and becomes unreadable.There is also a need to solve this problem. was.

However, the reality is that a recording material that satisfies all of these required performances has not yet been found. For example, Tokukai Akira!
The inkjet recording paper described in i-, 2-7'l, 3011 absorbs ink quickly, but the dot diameter tends to become large, the periphery of the dot tends to blur, and the size of the paper changes after recording. It has the disadvantage of being large.

An object of the present invention is to provide a recording material for inkjet recording that satisfies the above-mentioned requirements, particularly has a high resolution of recorded images, and is excellent in water resistance. Another object of the present invention is to provide a recording side 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 is a recording material for inkjet recording, characterized in that the base material or the coating layer provided on the base material contains a quaternized product of polyethyleneimine.

The quaternized product of polyethyleneimine (hereinafter referred to as quaternized polyethyleneimine) used in the present invention is obtained by preparing polyethyleneimine represented by the general formula (I) (wherein m and n are each positive integers) using a known method. The quaternized nitrogen atom has a structure shown in formula (IT) or formula (m).

(In the formula, x is an anionic group such as chlorine, bromine, iodine, methyl sulfate, etc.).

The molecular weight of the polyethyleneimine to be quaternized is preferably about g00 to 10θ000, more preferably about 000 to
It is about 10θ000.

As a method for quaternizing polyethyleneimine, for example, a method of alkylation with an alkyl halide such as methyl iodide or methyl bromide is used.

Further, the proportion of nitrogen atoms to be quaternized (quaternization rate) among all nitrogen atoms in the polymer is preferably about 70 to 1% SO.

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.

Examples of the method for manufacturing the recording material of the present invention by incorporating quaternized polyethyleneimine into the base material include a method of manufacturing paper using an aqueous solution of the quaternized polyethyleneimine in the papermaking process, or a method of manufacturing paper using an aqueous solution of the quaternized polyethyleneimine in the impregnation liquid. There is a post-treatment method in which quaternized polyethyleneimine is added and the substrate is immersed in this, but any method may be used. The optimum concentration of the quaternized polyethyleneimine aqueous solution in these cases varies depending on the viscosity of the aqueous solution, but it is generally appropriate to use a concentration within the range of 0.03-5 weight coefficient. In addition, the amount of the quaternized polyethyleneimine to be contained in the base material should be within the range of θO5-λ weight ratio or concave to the base material, and if the amount of the quaternized polyethyleneimine is too large, the ink This is not preferable because the absorption of

On the other hand, in the recording material of the present invention of the type containing quaternized polyethyleneimine in the coating 1 on the substrate, quaternized polyethyleneimine is added to the coating liquid, and this coating liquid is applied onto the substrate. Manufactured by coating and drying. 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. Inorganic pigments such as zinc, satin white, aluminum silicate, lithopone; starch, gelatin, casein, gum arabic, sodium alginate,
carboxymethylcellulose, polyvinyl alcohol,
Water-soluble polymers such as holvinylpyrrolidone and sodium polyacrylate; synthetic resin latex such as synthetic rubber latex; organic solvent-soluble resins such as polyvinyl butyral and polyvinyl chloride; Examples include various additives such as additives, lubricants, preservatives, and surfactants.

The amount of quaternized polyethyleneimine added to the coating solution is suitably in the range of 0.03 to 20% by weight. The coating liquid is usually coated by a known method (for example, a roll coater method, a blade coater method, an air knife coater method).
An amount of the order of ~50 g/m (dry coverage) is applied onto the substrate. Preferably, the coating amount is about 2 to 30 g/m (dry coating amount).

In this way, the recording side of the present invention, which contains quaternized polyethyleneimine in the base material or the coating layer provided on the base material, allows ink to be quickly absorbed into the inside of the recording side, and a recording liquid of a different color is produced. Even if the recording liquid adheres to the same spot repeatedly within a short period of time, there is no flow-out or oozing of the recording liquid, and clear image imprinting with high resolution is achieved. Furthermore, it exhibits excellent properties in terms of water resistance and color development, and is 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/ Quaternized polyethyleneimine A shown in Table-/.

Using B, C, and D, a coating composition was prepared based on the following composition.

Finely divided silicic acid 100 parts by weight Polyvinyl alcohol So
Quaternized polyethyleneimine /
〃Water S00
〃On the other hand, as a base material, general high-quality paper with a size degree of 3S seconds based on JIS Pg/22 (basis weight 5 g /
n? ), the above-mentioned coating composition was coated onto this substrate by a blade coater method at a dry coating weight of 3 g/m, and dried by a conventional method to obtain a recording material. Color inkjet recording was performed on this recording material using the following green ink, 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 33 2 parts by weight diethylene glycol 30 Water
70 〃Cyan ink (composition) C6 ■, Direct Blue g Otsu λ Part by weight diethylene glycol 30 〃Water
70 〃Black ink (
Composition) C, 1, Direct Black/Wayu Parts by weight Diethylene glycol 30 Water
70 Table λ 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. Water resistance is determined by immersing the recording material in running water for 7 hours, and comparing the optical density (OD) measured using a Macbeth densitometer after immersion with the O
Evaluation was made by comparing with the D value.

In addition, the color properties are measured using a colorimetric colorimeter N D -100/-D
Measured using Hunter Lab
It was shown in

Example λ An aqueous solution of quaternized polyethyleneimine C used in Example λ was prepared, and a sheet of general paper (basis weight 70
g/rrl>, and dried to approximately θS to the base material.
A recording material impregnated with weight-related quaternized polyethyleneimine C was obtained. Table 2 shows the results of evaluating this recording material in the same manner as in Example.

Comparative Example A recording material was prepared in the same manner as in Example, except that quaternized polyethyleneimine 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 the table.

Comparative Example Ω The base material used in Example Y 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 Ω.

table /

Claims (1)

[Claims] (1) A recording material for inkjet recording, characterized in that the base material or the coating layer provided on the base material contains a quaternary compound of polyethyleneimine.