JPS5933179A - Recording material - Google Patents

Abstract

PURPOSE:To provide an ink jet recording material excellent in color developing property of an ink and capable of producing a water-resistant recorded image with high resolution, by incorporating a water-soluble polyamide into a base or a coated layer provided on the base. CONSTITUTION:A water-soluble polyamide (e.g., modified 6-nylon of the formula or the like, the molecular weight of which is preferably 1,000-5,000) is incorporated into a coating liquid preferably in a quantity of 0.03-20wt%, and the coating liquid is applied onto the base preferably in an amount of 2-30g/m<2> (dry basis), for example, by a roll coater method to obtain the objective recording material. EFFECT:An ink is speedily absorbed into the recording material, recording liquids can be prevented from flowing out or oozing out even when different-colored recording liquids overlap at the same part in a short period of time, and a clear image with a high resolution is provided.

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 also used here.

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 it attracting attention as a recording method that can print in multiple colors? 1. Water-based recording liquids are mainly used for inkjet recording in terms of safety and printability.

The recording material used in this inkjet recording method has traditionally been regular paper. has been used. But is there faster recording speed? Inkjet recording as the performance of inkjet recording machines improves, such as multicolor?
Does it have more advanced characteristics for recording materials used for printing? It's requested. In other words, is it as high resolution as a color photograph? How to obtain high recording quality? The recording material must: 1) absorb ink as quickly as possible; 2) when ink dots overlap, the ink that adheres later will not flow onto the previous dot; 3) the ink dots Need a diameter? It should not be larger than necessary... 4) The shape of the dot should be close to a perfect circle, and the surrounding area should be smooth? 5) The density of the ink dots is high and the periphery of the dots is not blurred. 1) The color development of the ink is amazing. , 1. Various demands such as. Rinisu. We need 0, which is something. ．． ．． ．． 7
．． Tru.

Also, on the other hand, I1 Inkji. Etsu. 1. Since the printing method uses water-based ink, if the recorded image has a water-based ink or is exposed to water. Such a body! There was also a case where the : was blurred and became unreadable, and a solution was also required.

However, is it possible to meet all of these required performances? The reality is that a recording material that satisfies the requirements has not yet been found. For example, the inkjet recording paper described in JP-A-52-74.3.04 absorbs ink quickly, but the dot 1 diameter becomes large and the peripheral force of the dot 1 tends to blur. , and also has the disadvantage that the size of the paper changes significantly after recording.

Does the first object of the present invention satisfy the above requirements? let me,
In particular, it is an object of the present invention to provide an inkjet recording material with high resolution of recorded images and excellent water resistance. Another object of the present invention is to improve the coloring properties of ink and to print an inkjet 1/recording with excellent color properties. ．． 'I1. I. To provide quasi-recording materials.

．． }2 and other [1] achieved by the following present invention
””'n'y. ．． 1 layer 1: High.・Magazine i.e. tree l
l! 1I1. ．． Oh, the base material or the coating on the base material? Is there water-soluble polyamide in the two layers? This is a recording material for inkjet recording, characterized in that it contains:

What are the typical water-soluble polyamides used in the present invention? the below described? ---Modified 6-nylon represented by the general formula "?" is exemplified.

This modified 6-nylon 11, 6-na? Iron's? Although it has a structure in which the hydrogen atom at the α-position is substituted with a dimethylamino group, the hydrophilicity and steric hindrance of the dimethylamino group destroys the crystallinity of 6-nylon and increases its water solubility. . In the formula, m and n represent integers, and there is no particular restriction on the bonding mode between the dimethylaminated modified unit and the unmodified unit, and they may be bonded randomly or in a block manner. good. 7 groups of dimethylamine. Change the substitution rate. By doing so, this modified 6-Nylole is resistant to water. change the solubility and softening point. However, the substitution rate of dimethyl thylamino group is 50% or more, more preferably 70%. The following are preferred from the viewpoint of water solubility. In addition, modification 6-. The molecular weight of nylon is
A value of the order of t,ooo to 2oo,ooo is appropriate, and a value of the order of 1,000 to 5,000 is preferred.・This invention. Other water-soluble polyamides that can be used include 66-nylon instead of the unmodified polyamide.
Nylon, 610-Ny. What I did to Rono etc. 1 and.
Examples include those in which the substituent is a diethylamime group or an alkylamino group instead of a dimethylamino group. can.

On the other hand, paper is typically used as the base material for the recording forest of the present invention, but cloth, resin film, synthetic paper, etc. may also be used as the base material. can be used.

As a method for producing the recording material of the present invention by adding water-soluble polyamide to a polyamide material, for example, a method of manufacturing paper using an aqueous solution of the polyamide in the papermaking process, or a method of adding the polyamide to the impregnation process, There is a post-treatment method in which the substrate is immersed in water, but any method may be used. Bori in these cases? Although the optimum concentration of the amide aqueous solution varies depending on the viscosity of the aqueous solution, it is generally appropriate to use a concentration within the range of 0.05 to 2% by weight. Further, the amount of water-soluble polyamide to be contained in the base material is in the range of 0.05 to 2% by weight based on the base material. Is the surrounding area appropriate and water soluble? If the amount of amide is too large, ink absorption will decrease, which is not preferable. ? on the other hand. , No. 1 (containing water-soluble polyamide in one coating layer of the material) Eve's recording material of the present invention is prepared by adding a water-soluble polyamide to the coating solution, It is manufactured by applying the liquid to the base material and drying it. For example, fine powdered silicic acid,
Clay, 1 quart, 1 diatom, 1 calcium carbonate,
, sulfuric acid, , sulfuric acid, . acid. Titanium chloride, oxidation -■. 1. Sachin Why: 1.? Silicic acid a.
An inorganic face like Luminium, RiL, Bon, etc.? Ingredients: starch, gelatin, casein, arabic acid, sodium alginate, carpoxymethylcellulose? water-soluble polymers such as base, polyvinyl alcohol, polyvinyl pyrrolidone, 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 pH regulators, antifoaming agents, lubricants, preservatives, and surfactants.

The amount of water-soluble polyamide added to the coating solution is 0.
．． A range of 0.03 to 20% by weight is suitable. The coating L liquid is
Usually 1 to 50
About g/m'. (dry coating amount) is applied to the base material-1-. Preferably about 2 to 30 g/m' (dry coating amount)
Coat. ? In this way, 1 mm of water-soluble polyamide is contained in the barrier coating layer provided on the base material or the base material-12. What is the recording material of the present invention? (:: The ink is quickly absorbed into the inside of the ink, and the recording/recording liquid of a different color can be used even if the same tube number is duplicated (7 or 1) within a short period of time. The beginning of the flow and 1
Provides high-resolution, clear images with no overflow phenomenon? It is something that In addition, it exhibits excellent properties in terms of water resistance and color development, making it easy to use when drying. It is suitable as a recording material for sheet recording.

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

Example 1 Substitution rate of dimethylamino J& as water-soluble polyamide 1
Using 00% modified 6-nylon (manufactured by Toray Industries, Inc.), a coating T composition was prepared based on the following composition.

Finely divided silicic acid 100 parts Polyvinyl alcohol 50/l Modified 6-nylon Q, 5tt Water 500// On the other hand, as a base material, -General-1 duplex paper with a sizing degree of 35 seconds based on JISP8122 (basis weight 135 g/l) Using a blade coater method, the coating composition described in -1-2 was coated on the substrate at a dry coating rate of 20 g/m'), and dried by a conventional method to form a recording material. 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 232 parts by weight Diethylene glycol 3Q // Water 7Q // Magenta ink (composition) C. I. Acid Red 822 parts by weight Diethylene glycol 30〃 Water 7Q // Cyan ink (composition) C. I. Direct Blue - 862 parts by weight diethylene glycol 30l! Water 7Q// Black ink (composition) C. I. Direct black 192 parts by weight Diethylene glycol 3 Qtr Water 70 // Table 1 shows the evaluation results of the recording properties of the recording material.

The degree of bleeding was determined by measuring the diameter of a printed dot using a stereomicroscope and indicating how many times larger it was than one ink drop red. Water resistance is determined by immersing the recording material in running water for 3 hours, and measuring the optical density (OD) using a Macbeth densitometer after immersion compared to the O before immersion.
Evaluation was made by comparing with the D value. Moreover, the color properties were measured using a colorimeter ND-1001-DP (manufactured by Nippon Denshoku Industries Co., Ltd.), and the results were converted into Munsell values.

Example 2 Modified 6-nylon with a dimethylamino group substitution rate of 74% (
Toray Co., Ltd.) 1% aqueous solution with 0 second size general paper (
Basis weight? Qg/rn') and dried to obtain a recording material impregnated with about 0.5% by weight of water-soluble polyamide based on the base material. Table 1 shows the results of evaluating this recording material in the same manner as in Example 1.

Comparative Example 1 Same as Example 1 except that modified 6-nylon was not added to the coating composition. A recording material was created using the following steps. The registration characteristics were evaluated in the same manner as in Example 1, and the results were as follows. are shown in Table 1.

Comparative Example 2 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. ．．

Claims (1)

[Claims] 1. An inkjet recording material 1, characterized in that the base material or the coating layer provided on the base material contains water-soluble polyamide.