JPH1060336A - Water-base recording fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a water-base recording fluid which satisfies the requirement for proper characteristics as the ecording fluid, forms a highly durable image on a recording paper having a dye accepting layer and can be used also for plain paper by producing a specified water-base recording fluid. SOLUTION: This recording fluid contains water-soluble dye(s) comprising an acid dye and/or a direct dye and water-soluble organic solvents, and further contains at least one compound selected among polyhydric alcohols and derivatives thereof and at least one cyclic compound having at least one carbonyl group as the solventQ at least when used for recording. The cyclic compound(s) preferably accounts for 1-50wt.% of the amount of total the recording fluid. It is desirable that the recording fluid also contains diglycerin borate or its derivative as the solvent therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording liquid, and more particularly to an aqueous recording liquid used as an ink for recording in a recording device such as a printer. The present invention provides, for example, a recording liquid used when recording is performed by applying a recording liquid containing a water-soluble dye to a dye-receiving layer of a recording material having a dye-receiving layer formed on a support. Available as
In particular, it can be used as a recording liquid when recording is performed by applying the recording liquid to plain paper having no dye receiving layer formed thereon. The recording liquid of the present invention can be applied to various recording techniques for forming an image (including a character image and not limited to a visible image) on a recording material (recording medium) by using the recording liquid.

[0002]

2. Description of the Related Art The technique of recording on a recording medium with a recording liquid containing a water-soluble dye has been adopted in a wide range of fields, and in recent years, a recording liquid has been imagewise formed on a recording medium in accordance with given image information. Significant progress has been made in the technology of recording by attaching to recording media. As this kind of technique, for example, there is an ink jet recording technique using ink, and this technique has recently been widely used in various fields. For example, with the recent spread of personal computers and the like, it is required to display the display images and the like of the personal computers on a sheet-like medium such as photographic paper in the same manner as a silver halide photograph. Technology is employed as one of the typical display recording means. In general, as a means of image formation (printing) in the ink jet recording technique, a liquid ink is applied onto recording paper as a sheet-shaped medium from a discharge port such as a nozzle by using an electric field, heat, pressure, or the like as a driving source, and the ink is formed. To form an image.

[0003] In the above ink jet recording technology,
In general, an aqueous ink containing a water-soluble dye is used as the ink, and a recording paper having a dye receiving layer for receiving a dye such as a dye formed on a support is generally used as a recording material.

[0004] The elements required for the aqueous ink used in the above-mentioned recording technology include the following: (1) Inconvenience due to solidification in the recording apparatus, for example, no clogging of the head of a printer. (2) It easily penetrates into a recording material, for example, recording paper (such as ink jet recording paper). (3) The printing portion is dried quickly. (4) Physical properties that can be stably discharged from a printer or the like. Etc.

In general, recording liquids such as the above-mentioned aqueous inks include:
In addition to water-soluble dyes and water, dye dissolving agents are often used, and as additives, wetting agents, surfactants, antibacterial agents, freezing point depressants, defoamers, and the like are used. Examples of the water-soluble dye include a water-soluble direct dye that has sufficient dyeing properties with respect to a general cellulosic material as a constituent material of a recording paper, and can independently produce a black color, and a water-soluble acid dye. Mainly used. Hereinafter, in the present specification, the “water-soluble direct dye and the water-soluble acid dye” may be simply referred to as “water-soluble anionic dye”.

When a recording paper having a dye-receiving layer for receiving a dye such as a dye formed on a support is used as the recording paper as a recording material, the dye-receiving layer of the recording paper is formed by bleeding of a water-soluble ink. In general, a layer in which various additives are dispersed in a water-soluble polymer having an excellent affinity for a dye is formed in order to suppress the occurrence of a dye.

According to the dyeing theory of a typical water-soluble anionic dye, the dye used in the above-mentioned ink jet recording technique is, after migration to the dye receiving layer, van der Waals with the dye receiving layer component. It is held in the dye receiving layer by interaction such as force and hydrogen bond.

Therefore, when an image formed by a dye containing a water-soluble anionic dye is brought into contact with a solvent or resin having a higher affinity, or heat energy sufficient to cancel the interaction between the dye and the dye receiving layer is obtained. Is supplied, dye elution or migration may be induced, or an image may be blurred. In such a situation, in the image formed by the water-soluble anionic dye, complete fixability as in silver halide photography cannot be secured.

In order to solve the above problems, for example, as described in JP-B-62-798, a method of forming a covalent bond with an active group in a dye-receiving layer by using a reactive dye as a dye for aqueous ink, Alternatively, US Pat. No. 4,694,302
As described in JP-A-63-11158, a method of forming an ionic bond between a dye anion and an organic polymer cation in a dye-receiving layer is disclosed. Means based on chemical bonds have been proposed, such as a method of forming ionic bonds between cations.

[0010]

In the background described above,
Various recording technologies have been developed, but in terms of improving the recording liquid, solvents and additives are contained in the ink to satisfy all the elements required for aqueous inks as described above. If this is done, the resulting ink will have a complex composition, and may not be able to exhibit the characteristics of the original solvent and additive, or may have physical properties that are not suitable for ejection from the printer head. Come.

Further, the conventional ink has a problem that it is not suitable for recording using plain paper as a recording material. That is, as described above, in recent years, ink jet recording apparatuses have been rapidly spreading as office and personal recording apparatuses. However, conventional ink for ink jet printers uses plain paper such as recycled paper and copy paper. For example, when used for printing on paper generally used in offices, the printed ink spreads along the fibers of the paper, so that the dot shape becomes unstable and bleeding occurs. For this reason, there has been a problem that thin ruled lines, thin characters, complicated kanji as defined in the JIS second standard, etc. are unclearly printed and are difficult to see. Therefore, the conventional ink is advantageous in terms of availability, simplicity, cost, etc., and is advantageous to plain paper (PPC paper, etc.).
Is difficult to use.

Further, in the method proposed in each of the above publications, the reactivity of the ink or the dye receiving layer becomes extremely high, and the image recorded on the recording paper on which the ink or the dye receiving layer is formed is formed. Is not sufficient in storage stability, and it is difficult to secure fixability as in silver halide photography.

Further, since the reaction between the dye and the dye receiving layer is not completed in a short time, it takes a long time until an image is stably formed, or heating is required to stably form an image. Inconvenience has also occurred.

[0014] Under the circumstances described above, conventionally, images formed by the ink jet recording technique are difficult to be practically used in fields requiring high image durability, such as identification photographs and printed matter for outdoor exhibitions. It has been. However, even in such a field, it is required to enhance the durability of the image so that the image formed by the ink jet recording technique can be realized.

The present invention has been made in view of the above-mentioned conventional circumstances, and an image formed on a recording paper having a dye receiving layer that satisfies proper characteristics as a recording liquid such as an ink for ink jet recording and has a durability. To provide a recording liquid having high durability, for example, having a durability comparable to that of silver halide photography, and having a property of being able to print well on plain paper generally used in offices such as recycled paper and copy paper. It is an object.

[0016]

The aqueous recording liquid according to the present invention is an aqueous recording liquid containing an acidic dye and / or a direct dye as a water-soluble dye and containing a water-soluble organic solvent. As an organic solvent, at least at the time of recording, at least one selected from a compound group consisting of a polyhydric alcohol and a polyhydric alcohol derivative and at least one cyclic compound having one or more carbonyl groups are simultaneously contained. It is a feature. In the present invention, a polyhydric alcohol or a polyhydric alcohol derivative,
The cyclic compound having a carbonyl group may be present at the time of recording, that is, at the time of printing or drawing as an ink or the like, and may coexist in the recording liquid or may be mixed at the time of recording. Note that the recording liquid may naturally contain an arbitrary dye, and may be used, for example, for forming a full-color image.

The present invention has been made based on the following findings by the present inventors. That is, as a result of diligent studies by the present inventors, it has been found that a water-soluble anionic dye can be used as a recording liquid having characteristics to achieve the above-mentioned object, when used together with a specific solvent. is there.

Further, the invention utilizes the fact that the water-soluble anionic dye is firmly fixed by an intercalation reaction based on an ion exchange action between layers having an excellent water-adsorbing property or swelling property with respect to water and having an anion-exchanging ability. It has been found that, when this recording liquid is applied to a dye receiving layer, an image having good storability and fixability and good durability is formed. Furthermore, even with plain paper commonly used in offices, such as recycled paper and copy paper, the use of the above recording liquid causes the printed ink to spread along the fibers of the paper, causing the dot shape to become unstable and causing blurring. I found that it could be suppressed.

The present invention will be further described below. In the recording liquid of the present invention, at least at least one compound selected from the group consisting of polyhydric alcohols and polyhydric alcohol derivatives is used as a water-soluble organic solvent at the time of recording. And at least one cyclic compound having one or more carbonyl groups.

Polyhydric alcohols and polyhydric alcohol derivatives are generally high-boiling solvents, are hygroscopic, and have the effect of preventing clogging of, for example, nozzles, which are recording liquid ejection parts. Among polyhydric alcohols, diethylene glycol, glycerin and the like are also excellent solvents for dyes. Furthermore, polyhydric alcohols and polyhydric alcohol derivatives
When the recording liquid is formed as an ink, it also has an effect of lowering the freezing point of water serving as a base and improving the preservability of the ink. The content of the polyhydric alcohol and the polyhydric alcohol derivative may be, for example, 1% by weight or more based on the total amount of the recording liquid. A preferable upper limit of the content is, for example, when ink is used as a recording liquid, the total amount is 4 in consideration of the viscosity and drying property of the ink.
It is about 0% by weight, preferably 5% to 30% by weight in total.

The cyclic compound having one or more carbonyl groups has an effect of promoting the fixing of the dye. For example, when used in a dye-receiving layer having an intercalation compound, dyes which cannot be completely penetrated into the dye-receiving layer and which cannot be reacted with the intercalation compound are also promoted by the action of the cyclic compound having one or more carbonyl groups. Is done. Among such cyclic compounds, propylene carbonate and the like also serve as excellent solvents for dyes. Further, when the recording liquid is formed as an ink, the freezing point of water serving as a base is lowered, and an effect of increasing the preservability of the ink is also exhibited. The content of the cyclic compound is preferably in the range of 1 to 50% by weight based on the total amount of the recording liquid.

Further, it is preferable that diglycerin borate (hereinafter sometimes referred to as DGB) or a derivative thereof is contained as a solvent in the recording liquid. The diglycerin borate (DGB) or a derivative thereof preferably contains at least one kind of glycol derivative, one or more kinds of cyclic ketone derivatives, or a compound thereof. The above diglycerin borate (D
GB) has the effect of controlling the surface tension without changing the viscosity and improving the ejection stability of recording droplets. Further, diglycerin borate (DGB) has a hygroscopic property, has an effect of preventing clogging of nozzles, and has an effect of improving storability when a recording liquid is formed as ink. Further, it has the effect of preventing the occurrence of mold when the recording liquid is formed as ink, thereby improving the storage stability. It is preferable to use diglycerin borate (DGB) or a derivative thereof having an MIC (μg / ml) of 3200 or less against Staphylococcus aureus. The content of diglycerin borate (DGB) or a derivative thereof contained in the recording liquid is as follows:
The content is preferably in the range of 1 to 30% by weight of the entire recording liquid.

As the surfactant in the recording liquid, it is preferable that a nonionic surfactant having at least one boron atom in the molecular structure is contained in the composition of the recording liquid. This non-ionic surfactant, without affecting the viscosity, wettability of the ink, lightfastness of the image,
This has the effect of controlling the surface tension when ink is formed as a recording liquid. The content of the surfactant contained in the recording liquid is preferably 0.01 to 1% by weight of the whole recording liquid.

In this case, at least one
A nonionic surfactant with three boron atoms has a MIC (μg / ml) against S. aureus of 320
It is preferably 0 or less.

In the practice of the present invention, the water-soluble dye in the recording liquid is a direct dye, and a dye represented by the following formula (1):
Or, C.I. I. It is a preferable embodiment that any one of Direct Yellow 132 is used.

[0026]

Embedded image

In the practice of the present invention, the water-soluble dye in the recording liquid is an acid dye, and C.I. I. Acid Red 24
9, or C.I. I. Acid Black 2 is a preferred embodiment.

In the practice of the present invention, the recording liquid of the present invention can be used in a form in which recording is performed by adhering to the dye receiving layer of a recording paper having a dye receiving layer containing an interlayer compound formed thereon. .

In the practice of the present invention, the recording liquid of the present invention can be used in a form in which recording is performed by attaching the recording liquid to plain paper.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described below in more detail with reference to specific examples. However, needless to say, the present invention is not limited to the embodiment described below.

Example 1 In this example, the following experiment was performed. That is, in this experiment, the aqueous recording liquid according to the present invention was embodied and used as an inkjet recording liquid containing a direct dye and an acidic dye as water-soluble dyes. Further, as a recording material, a recording paper having a dye receiving layer as described below, and,
A paper (plain paper) generally used in an office is prepared, and the properties as an aqueous recording liquid, particularly the properties as an ink jet recording liquid when performing recording on these using the above aqueous recording liquid, are used in an office. Investigations were carried out, including bleeding of print samples when recorded on commonly used plain paper.

The constitutions of the ink sample (the ink sample according to the present invention and the comparative ink sample) and the recording paper used in this example are described below. [Ink Sample] As a specific example of the aqueous recording liquid according to the present invention, an ink sample 1 having the following composition was prepared. Examples of the water-soluble dye include C.I. I.
Direct Blue 199 was prepared and used to prepare Ink Sample 1. The “parts” shown below are
Unless otherwise specified, "parts by weight" are indicated. (Ink composition of ink sample 1) Dye 5 parts Water 61.99 parts Diethylene glycol 5 parts Diethylene glycol monomethyl ether 9.5 parts 2-pyrrolidone 3 parts Diglycerol borate 0.5 parts Propylene carbonate 15 parts Nonionic surfactant (LB -120, manufactured by Boron International) 0.01 part LB-120 which is a nonionic surfactant in the above composition
Has an antibacterial effect with a boron atom at the center and an MIC (μg / ml) of 3200 or less against Staphylococcus aureus, and has an antistatic effect. [Ink comparative sample] The dye uses the same dye as used for the above ink sample preparation, and by the following formulation,
Ink comparative sample 1 was obtained. The ink comparative sample 1 does not contain propylene carbonate, which is a carbonyl group-containing cyclic compound, unlike the ink sample 1 according to the present invention. It does not contain diglycerin borate. (Ink composition of ink comparative sample 1) Dye 5 parts Water 77.5 parts Diethylene glycol 5 parts Diethylene glycol monomethyl ether 9.5 parts 2-Pyrrolidone 3 parts

[Recording Paper Sample] A recording paper having a dye receiving layer and a recycled paper generally used in offices having the following constitutions were prepared. (Recording paper sample-1, photographic paper described in Japanese Patent Application No. 07-182853) Synthetic hydrosaltite (fired hydrosaltite manufactured by Kyowa Chemical Industry Co., Ltd. (trade name: KW2000)) as an interlayer compound in 90 g of ethyl alcohol
And as a resin, polyvinyl butyral (trade name: S-LEC BL-S, manufactured by Sekisui Chemical Co., Ltd.) 1
g was added and dispersed by a roll mill for 2 weeks to obtain a suspension solution. The above-mentioned intercalation compound is a compound in which two or more layers of molecules (generally, high molecular compound molecules) constitute a layer, and can have exchangeable ions between the layers.

Subsequently, a transparent polyethylene terephthalate film having a thickness of 125 μm was prepared as a support,
The above suspension solution was applied thereon using a wire bar so as to have a dry thickness of 10 μm to form a dye-receiving layer to produce a recording paper, which was used as a recording paper sample.

Separately, recycled paper was separately prepared as paper generally used in offices and used as recording paper.

Next, the ink sample 1 and the ink comparative sample 1 obtained as described above were refilled as ink for a printer (MJ-800C) manufactured by Epson Corporation. First, clogging of the printer head was examined. .
も の indicates that the printer head was not clogged, and X indicates that the printer head was clogged.

Next, the ejection stability of the ink from the nozzle was examined.も の indicates that the ink was stably ejected from the nozzle of the printer, and X indicates that the ink was not stably ejected.

Further, the storage stability of the ink was examined. Here, the storage stability was investigated in terms of viscosity change, deterioration, presence / absence of precipitate formation, and clogging of the head during storage. Specifically, the inspected ink was refilled as the ink for the printer manufactured by Epson, and was left at room temperature (25 ° C.) for one week without using it. After standing, printing was performed, and the storage stability was determined based on the change in the ink ejection state. The ink having storage stability was rated as ○, and the ink having no storage stability was rated as ×. Table 1 shows the above results.

[0039]

[Table 1]

Using the ink sample 1 and the ink comparative sample 1, printing was performed on a recording paper sample, which was a photographic paper having the above-described dye-receiving layer, to obtain a print sample. In this case, the permeability and the drying property of the ink in the printing portion of the recording paper having the dye receiving layer were examined.も の indicates that the ink had good penetration and drying properties into the printing portion of the recording paper having the dye-receiving layer, and x indicates that it was poor.

Next, printing was performed using recycled paper commonly used in offices as recording paper, and ink bleeding in that case was examined. Regarding the bleeding that occurs because the printed ink spreads along the fibers of the paper and the dot shape becomes irregular, も の indicates no such bleeding, and X indicates bleeding. Table 2 shows the results.

[0042]

[Table 2]

From the results shown in Tables 1 and 2, the ink sample 1 containing the water-soluble dye having the specific solvent and the additive in the recording liquid shows that the ink sample 1 containing the specific solvent and the additive in the recording liquid does not contain the specific solvent and the additive. It can be seen that Comparative Example 1 satisfies the characteristics as an inkjet recording liquid. In particular, it has no clogging, has good ejection stability, has storage stability, and has good permeability and dryness of the printing portion. Further, it was confirmed that the aqueous ink is suitable for both a recording paper having a dye receiving layer and a paper generally used in an office. In addition,
In this example, the use of diglycerin borate was able to further enhance the ejection property and storage stability.
Further, in the present example, the use of a surfactant having an antibacterial property could further enhance the ejection property and the storage stability (antibacterial property).

Example 2 In this example, the following experiment was conducted. That is, in this experiment, the aqueous recording liquid according to the present invention was embodied in an inkjet recording liquid containing a direct dye or an acidic dye as a water-soluble dye, and used, and the durability of an image formed using this was measured. Examined. The recording materials used were recording paper having the same dye-receiving layer as used in Example 1, and paper (plain paper) generally used in offices.

The structures of the ink samples used in this example (four kinds of ink samples according to the present invention and comparative ink samples) are described below. [Ink Samples] As specific examples of the aqueous recording liquid according to the present invention, ink samples 2 to 5 having the following formulations were prepared. Four types of water-soluble dyes were prepared, and C.I. I.
Direct Blue 199, C.I. I. Direct yellow 132 (direct dyes above), C.I. I. Acid Red 24
9, C.I. I. Acid Black 2 (acid dye) was used.

(Ink composition of ink samples 2 to 5) Dye 5 parts Water 61.99 parts Diethylene glycol 5 parts Diethylene glycol monomethyl ether 9.5 parts 2-pyrrolidone 3 parts Diglycerin borate 0.5 parts Propylene carbonate 15 parts Non-ion Surfactant (LB-120, manufactured by Boron International) 0.01 part

[Comparative Ink Samples] The dyes used were the same as those used for the preparation of the above ink samples, and were used as ink comparative samples 2 to 5 with the following formulations. These ink comparative samples 2 to 5 do not contain propylene carbonate, which is a carbonyl group-containing cyclic compound, compared to the ink samples 2 to 5 according to the present invention. It does not contain diglycerin borate. (Ink composition of ink comparative samples 2 to 5) Dye 5 parts Water 77.5 parts Diethylene glycol 5 parts Diethylene glycol monomethyl ether 9.5 parts 2-Pyrrolidone 3 parts

Next, the ink samples 2 to 5 and the ink comparative samples 2 to 5 obtained as described above were refilled as ink for an Epson printer (MJ-800C), and the recording paper (dye Printing was performed on a photographic paper having a receiving layer) to obtain a sample (print sample) on which an image (print) was formed. The light resistance and water resistance of the obtained print sample were examined as follows.

That is, in order to investigate the light fastness, the density of the print formed on the recording paper sample by the ink samples 2 to 5 and the ink comparison samples 2 to 5 was measured using a densitometer manufactured by Macbeth (model name: TR-924). ).

Next, each sample was irradiated with energy of 90 kJ / m ² for 72 hours using a xenon arc fade meter (Atlas tester).

Subsequently, the print density of each sample after the energy irradiation was measured in the same manner as described above. The evaluation was evaluated as ○ when the print sample after the energy irradiation showed little change in density and color difference from the initial state, Δ when the print sample was slightly inferior to the initial print sample, and X when severely deteriorated. Table 3 below shows the evaluation results.

[0052]

[Table 3]

From the results in Table 3, it can be seen that an ink sample containing a water-soluble dye having a specific solvent and an additive in a recording liquid was obtained on a recording paper having a dye receiving layer containing an interlayer compound formed on a support. It was confirmed that the samples recorded by using Nos. 2 to 5 had improved light fastness compared with Comparative Samples 2 to 5 of the recording liquid in which the recording liquid did not contain the specific solvent and the additive.

Further, the following experiment was conducted to examine the water resistance. That is, the recording paper printed by the ink samples 2 to 5 and the ink comparison samples 2 to 5 was immersed in distilled water for 10 minutes so that the image forming surface (printing surface) was in contact with water. At this time, the sample was evaluated as ○ when no dye was eluted and did not cause image bleeding, and was evaluated as x when the dye was eluted into water. The results are shown in Table 4 below.

[0055]

[Table 4]

From the results shown in Table 4, it can be seen that an ink sample containing a water-soluble dye having a specific solvent and an additive in a recording liquid was obtained on a recording paper having a dye receiving layer containing an interlayer compound formed on a support. It was confirmed that the recordings obtained by recording with Nos. 2 to 5 had higher water resistance than the recording liquid comparative samples 2 to 5 which did not contain the specific solvent and the additive in the recording liquid.

According to the present embodiment, as described above, an ink sample containing a water-soluble dye having a specific solvent and an additive in a recording liquid is formed on a recording paper having a dye receiving layer formed on a support. In the recording performed by 2 to 5, the dye is firmly fixed and held by the intercalation reaction based on the ion exchange action, so that the direct dye is firmly fixed in the dye receiving layer by the interlayer compound. confirmed.

Therefore, the aqueous recording liquid of the present invention satisfies the characteristics as a recording liquid for ink jet recording, and
It was confirmed that the image formed on the recording paper having the dye receiving layer had good storability and fixability, and also had good durability.

Separately, as in Example 1, printing was performed using recycled paper commonly used in offices as recording paper, and bleeding of the ink in that case was examined. And printing without bleeding was obtained. Therefore, this recording liquid (ink samples 2 to
5) is for paper commonly used in offices,
It was confirmed that it was appropriate.

As is clear from the above description, the aqueous recording liquid of the present invention satisfies the characteristics as a recording liquid for ink jet recording and is generally used in offices even for recording paper having a dye receiving layer. It has been confirmed that the paper has appropriateness for plain paper that has been used.

The aqueous recording liquid of the present invention containing a water-soluble dye is formed by the dye being firmly fixed and held in the dye-receiving layer containing the intercalation compound by an intercalation reaction based on an ion exchange action. The storability and fixability of the image are improved, and the durability is also improved.

From the above, the aqueous recording liquid of the present invention is
It can be seen that the recording paper can be used without choosing. Further, when an image is formed on a recording paper provided with a dye receiving layer containing an intercalation compound using the aqueous recording liquid of the present invention, it has durability comparable to that of a silver salt photograph, It can be sufficiently used as an outdoor exhibit or the like, and its industrial value is very high.

[0063]

The aqueous recording liquid of the present invention satisfies the proper characteristics as a recording liquid such as an ink for ink jet recording, and the image formed on a recording paper having a dye receiving layer has high durability. In addition to having durability comparable to salt photography, it also has the effect of having the property of being able to print well on plain paper generally used in offices such as recycled paper and copy paper.

Claims (13)

[Claims] 1. An aqueous recording liquid containing an acid dye and / or a direct dye as a water-soluble dye and containing a water-soluble organic solvent, wherein the water-soluble organic solvent is a polyhydric alcohol and An aqueous recording liquid comprising simultaneously at least one selected from the group consisting of polyhydric alcohol derivatives and at least one cyclic compound having one or more carbonyl groups. 2. The aqueous recording liquid according to claim 1, wherein the content of the cyclic compound having one or more carbonyl groups is 1 to 50% by weight of the whole recording liquid. 3. The aqueous recording liquid according to claim 1, further comprising diglycerin borate or a derivative thereof. 4. The aqueous recording liquid according to claim 3, wherein the content of diglycerin borate or a derivative thereof is 1 to 30% by weight of the whole recording liquid. 5. The diglycerin borate or a derivative thereof,
The MIC (μg / ml) for the Staphylococcus aureus is 3
The aqueous recording liquid according to claim 3, wherein the aqueous recording liquid is 200 or less. 6. A diglycerin borate or a derivative thereof,
The aqueous recording liquid according to claim 3, comprising at least one cyclic ketone derivative. 7. The aqueous recording liquid according to claim 1, further comprising a nonionic surfactant having at least one boron atom in a molecular structure. 8. The recording medium according to claim 1, wherein the content of the surfactant is 0.
The aqueous recording liquid according to claim 7, wherein the amount is from 01 to 1% by weight. 9. The nonionic surfactant having at least one boron atom in its molecular structure has an MIC (μg / ml) of 3200 or less against Staphylococcus aureus. 2. The aqueous recording liquid according to item 1. 10. The water-soluble dye in the recording liquid is a direct dye, and is a dye represented by the following formula (1): I.
2. The aqueous recording liquid according to claim 1, which is any one of Direct Yellow 132. Embedded image (11) the water-soluble dye in the recording liquid is an acid dye; I. Acid Red 249 or C.I.
I. The aqueous recording liquid according to claim 1, which is any one of Acid Black 2. 12. The aqueous recording liquid according to claim 1, wherein the recording is carried out by adhering to a dye receiving layer of a recording paper having a dye receiving layer containing an interlayer compound formed thereon. 13. The aqueous recording liquid according to claim 1, wherein recording is performed by attaching the recording liquid to plain paper.