JPH07102202A - Recording liquid - Google Patents

Abstract

PURPOSE:To provide a recording liquid free from the odor of ammonia and improved in drying resistance by mixing a colorant with glucose glutamate and water. CONSTITUTION:2-20wt.% colorant comprising a water-soluble dye and a pigment is mixed with 0.1-30.0wt.% glucose glutamate and 30-80wt.% water. According to need, the mixture is further mixed with 0.01-5.0wt.% dispersant selected from among a resinous dispersant, a nonionic surfactant, and an anionic surfactant, 1-50wt.% water-soluble organic solvent, an antiseptic, a mildew-proofing agent, a rust preventive, an anti-foaming agent, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording liquid used for writing instruments, recorders, ink jet printers, and the like, and more specifically to a recording liquid having excellent resistance to drying at a pen tip and an ink ejection hole. .

[0002]

2. Description of the Related Art Conventionally, a recording liquid used for a writing instrument, a recorder, an ink jet printer, etc., contains a coloring material such as a dye or a pigment and water as a main component to improve the drying resistance at a pen tip or an ink ejection hole. Therefore, it has been widely known to add urea as an anti-drying agent.

[0003]

However, the recording liquid to which urea has been added has a problem that when stored for a long period of time, urea is decomposed and ammonia gas is generated to give a strong ammonia odor.

[0004]

DISCLOSURE OF THE INVENTION The gist of the present invention is a recording liquid containing at least a coloring material, glucose glutamate, and water.

The present invention will be described in detail below. Water-soluble dyes and pigments can be used as the coloring material. The water-soluble dye is
Any of a direct dye, an acid dye, an edible dye and a basic dye can be used, and the pigment can be an inorganic pigment or an organic pigment.

An example of a direct dye is described below. C.
I. Direct Black 17, Same 19, Same 22 and Same 3
2, ibid 38, ibid 51, ibid 71, ibid 154, C.I. I. Direct Yellow 4, the same 26, the same 44, the same 50, C.I. I. Direct Red 1, the same 4, the same 23, the same 31, the same 37, the same 39, the same 75, the same 80, the same 81, the same 83, the same 225, the same 226, the same 227, C.I. I. Direct Blue 1 and 1
5, ibid 71, ibid 86, ibid 106, ibid 199, etc.

An example of the acid dye will be described below. C.
I. Acid Black 1, 2, 2, 24, 26, 3
1, 52, 107, 109, 110, 11
9, 154, C.I. I. Acid Yellow 7: 1, 1
7, ibid 19, ibid 23, ibid 25, ibid 29, ibid 38, ibid 4
2, 49, 61, 72, 78, 110, 1
41, 127, 135, 142, C.I. I. Acid Red 8, the same 9, the same 14, the same 18, the same 26, the same 27,
35, 37, 51, 52, 57, 82, 87, 92, 94, 111, 129, 13
1, 1, 138, 186, 249, 254, 26
5, 276, C.I. I. Acid Violet 15, 17, 17, C.I. I. Acid blue 1, same 7, same 9, same 1
5, ibid 22, ibid 23, ibid 25, ibid 40, ibid 41, ibid 4
3, 62, 78, 83, 90, 93, 10
3, 112, 113, 158, C.I. I. Acid Green 3, 9, 9, 16, 25, 27 etc.

Most of food dyes are contained in direct dyes or acid dyes.
C. I. Food Yellow 3 can be mentioned.

An example of the basic dye will be described below. C.
I. Basic Yellow 1, Same 2, Same 21, C.I. I. Basic Orange 2, the same 14, the same 32, C.I. I. Basic Red 1, the same 2, the same 9, the same 14, C.I. I. Basic Violet 1, Same 3, Same 7, C.I. I. Basic Blue 3, 26, C.I. I. Basic Green 4, C.I.
I. Basic Brown 12, C.I. I. Basic Black 2 and 8 etc.

An example of the inorganic pigment is described below. Loess,
Barium yellow, navy blue, cadmium red, titanium oxide, red iron oxide, iron black, carbon black, etc.

An example of the organic pigment will be described below. Azo pigments, phthalocyanine pigments, nitroso pigments, nitro pigments, basic dye lake pigments, acidic dye lake pigments, etc.

The above dyes and pigments can be used alone or in combination of two or more. The amount used is preferably 2 to 20% by weight based on the total amount of the recording liquid.

In particular, when a pigment is used as a coloring material, it is necessary to use a dispersant in terms of dispersibility, stability over time, and workability. As the dispersant, a resin-based dispersant, a nonionic surfactant, or an anionic surfactant can be used.

An example of the resin-based dispersant is described below. Styrene-acrylic acid copolymer salt, styrene-acrylic acid alkyl ester-acrylic acid copolymer salt, styrene-maleic acid copolymer salt, styrene-maleic acid alkyl ester-maleic acid copolymer salt, etc. .

An example of the nonionic surfactant will be described below. Glycerin fatty acid ester, polyglycerin fatty acid ester, propylene glycol fatty acid ester, pentaerythritol fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitol fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyethylene glycol fatty acid ester, polyoxyethylene methyl ether , Polyoxyethylene phytosterol, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyoxyethylene lanolin, polyoxyethylene lanolin alcohol, polyoxyethylene alkyl Amine, polyoxyethylene fatty acid amide, polio Such as shea alkylphenyl formaldehyde condensates.

An example of the anionic surfactant will be described below. Alkyl sulfate, polyoxyethylene alkyl ether sulfate, N-acyl amino acid salt, N-acyl alkyl taurine salt, polyoxyethylene alkyl ether acetate, alkyl phosphate, polyoxyethylene alkyl ether phosphate and the like.

These dispersants can be used alone or in combination of two or more. The amount used is 0.
It is preferable to add 01 to 5.0% by weight.

Glucose glutamate is used to improve the drying resistance of the pen tip and the ink discharge hole. Glutamic acid glucose is obtained by an esterification reaction between glucose and glutamic acid. As a commercial product, a 60 wt% aqueous solution product such as glucose glutamate (manufactured by Kyowa Hakko Kogyo Co., Ltd.) can be mentioned.
The amount of glucose glutamate used is preferably 0.1 to 30.0% by weight based on the total amount of the recording liquid.

Water is used as a main solvent, and its amount is preferably 30 to 80% by weight based on the total amount of the recording liquid.

In addition to the components shown above, a water-soluble organic solvent may be used for moisturizing and / or freezing prevention, if necessary. Examples thereof include alcohols such as methanol, ethanol, propanol, isopropanol, butanol, and isobutanol, glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1,3 butylene glycol and thiodiglycol, and ethylene glycol. Monoalkyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monomethyl ether acetate, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, N-methyl-2-
Pyrrolidone, sorbit, sorbitan, acetin, glycerin and the like can be mentioned. These water-soluble organic solvents can be used alone or in combination of two or more. The amount used is preferably 1 to 50% by weight based on the total amount of the recording liquid.

Further, various additives such as antiseptics, antifungal agents, rust preventives for preventing corrosion of metal parts, surfactants, defoaming agents and the like can be appropriately selected and used.

The present recording liquid can be easily prepared by using a dye as a coloring material by mixing and stirring with a conventionally known stirrer, and by using a pigment with a conventionally known disperser. It can be easily obtained by dispersing and mixing.

[0023]

[Function] Since glucose glutamate has many hydroxyl groups and carboxyl groups in its molecule, it suppresses the evaporation of the solvent (especially water) in the recording liquid and prevents the pen tip of the recording liquid and the ink discharge hole from being discharged. Improves dry resistance. In addition, glucose glutamate is excellent in decomposition stability and does not cause a problem such as decomposition of urea to generate ammonia gas unlike urea.

[0024]

EXAMPLES The present invention will now be described in more detail with reference to examples.

Example 1 C. I. Direct Black 19 7.0 parts by weight Glucose glutamate (manufactured by Kyowa Hakko Kogyo Co., Ltd.) 16.0 parts by weight Water 59.0 parts by weight Ethylene glycol 17.0 parts by weight Proxel GXL (manufactured by ICI Japan, antiseptic) Agent) 0.5 parts by weight Benzotriazole 0.5 parts by weight A black recording liquid was obtained by stirring the above components for 2 hours.

Example 2 C. I. Food Yellow 3 5.0 parts by weight Glucose glutamate (previously described) 0.3 parts by weight Water 75.7 parts by weight Glycerin 18.0 parts by weight Bioclean P-1487 (K-AI Kasei Co., Ltd. preservative) 1. 0 parts by weight The above components were treated in the same manner as in Example 1 to obtain a yellow recording liquid.

Example 3 C. I. Acid Blue 9 6.0 parts by weight Glucose glutamate (described above) 43.0 parts by weight Water 29.0 parts by weight Propylene glycol 12.0 parts by weight Thiodiglycol 9.0 parts by weight Bioclean P-1487 (described above) 1.0 Parts by weight The above components were treated in the same manner as in Example 1 to obtain a blue recording liquid.

Example 4 C. I. Direct Blue 199 5.2 parts by weight Glucose glutamate (previously described) 53.0 parts by weight Water 28.5 parts by weight Ethylene glycol 12.0 parts by weight Biotac (Kai Kasei Co., Ltd., preservative) 0. 8 parts by weight benzotriazole 0.5 parts by weight The above components were treated in the same manner as in Example 1 to obtain a blue recording liquid.

Example 5 C. I. Acid Yellow 42 4.0 parts by weight Glucose glutamate (described above) 0.1 parts by weight Water 77.4 parts by weight Ethylene glycol 10.0 parts by weight Glycerin 8.0 parts by weight Proxel GXL (described above) 0.5 parts by weight The above components In the same manner as in Example 1, a yellow recording liquid was obtained.

Comparative Example 1 C. I. Direct Black 19 7.0 parts by weight Water 75.0 parts by weight Ethylene glycol 17.0 parts by weight Proxel GXL (previously described) 0.5 parts by weight Benzotriazole 0.5 parts by weight The above components are the same as in Example 1. As a result, a black recording liquid was obtained.

Comparative Example 2 C. I. Acid Blue 9 6.0 parts by weight Urea 10.0 parts by weight Water 62.0 parts by weight Propylene glycol 12.0 parts by weight Thiodiglycol 9.0 parts by weight Bioclean P-1487 (previously described) 1.0 parts by weight A blue recording liquid was obtained by carrying out the same procedure as in Example 1 except that the above components were used.

A commercially available felt-tip pen (S520, manufactured by Pentel Co., Ltd.) filled with 2.0 g of the recording liquid obtained in each of Examples 1 to 5 and Comparative Examples 1 and 2 was used to dry the pen tip. A test and an ammonia odor confirmation test were conducted. The results are shown in Table 1.

[0033]

[Table 1]

Pen tip drying resistance test: temperature 25 ° C., humidity 6
Under a condition of 5%, the writing instrument was left sideways with the cap removed, and handwriting was performed on a high-quality paper at regular intervals, and the time until the handwriting was blurred was measured.

Ammonia odor confirmation test: a writing instrument at a temperature of 50
In a thermostat at 25 ° C and a humidity of 25%, the cap was left sideways, and the cap was removed one month later, and the presence or absence of ammonia odor was confirmed. (○: odorless, ×: ammonia odor)

[0036]

As described above in detail, the recording liquid of the present invention is excellent in the drying resistance at the pen tip and the ink discharge hole, and causes a problem that an ammonia odor is generated even if it is stored for a long period of time. It has an excellent property of not generating. Further, in the above examples, the present recording liquid was described as being filled in a writing instrument, but the present recording liquid can be used not only as a writing instrument but also as a recording liquid other than a writing instrument, a recording liquid for an ink jet printer, etc. is there.

Claims (1)

[Claims] 1. A coloring material and glucose glutamate,
A recording liquid containing at least water.