JP3251886B2 - Decolorable ink composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for writing, copying or drawing, in which the written, copied or drawn material is preserved and maintained as long as it is shielded from light or irradiated with relatively weak visible light. The present invention also relates to a decolorizable ink composition which can be rapidly turned colorless by irradiation with visible light when it becomes unnecessary.

[0002]

2. Description of the Related Art Conventionally, as a basic element required for an ink composition used for writing, copying or drawing, the "glue" of the ink composition is good, and The marks must be clear. In many cases, in addition to these factors, the persistence of writing, copying, or drawing marks is required.

[0003] In recent years, writing instruments and copy articles have been diversified, and new types of ink compositions have been used which limit the persistence of the ink composition used or remove ink marks when unnecessary. Interest in ink compositions is growing.

[0004] From this point of view, there are presently sewing markers and so-called line markers with limited durability, but all of them have defects in "paste" and sharpness and are practically satisfactory. It was not a thing.

[0005]

In view of such circumstances, after writing, copying, or drawing, the written, copied, or drawn material is preserved as long as it is shielded from visible light or irradiated with relatively weak visible light. As a result of intensive studies on a decolorizable ink composition that can be maintained, but can be quickly turned colorless by irradiation with visible light when it becomes unnecessary, microorganisms belonging to the genus Yantinobacterium are produced. The present inventors have found that the dye exhibits an excellent decolorizing ink effect, and have completed the present invention. The purpose of the invention is to write, copy or draw, and then block or relatively prevent visible light. The written, copied or drawn material is preserved and maintained as long as it is exposed to weak visible light, but when it becomes unnecessary, Also to provide a rapidly capable of colorless decolorizable ink composition.

[0006] The above object is achieved by a decolorizable ink composition comprising a pigment produced by a microorganism belonging to the genus Yantinobacterium.

[0007]

Embodiments of the present invention will be described below in detail.

[0008] Examples of the pigments of microorganisms belonging to the genus Yantinobacterium used in the present invention include, for example, the Contract of Microfabrication Research No. 9 described in Japanese Patent Publication No. 4-6347.
No. 303, a dye of Yanthinobacterium lividum KK-217 strain, Yanthinobacterium lividum NCTC 9796 strain, DA (Sneath),
MB (Sneath), NCTC 8661, HA
(Sneath), P1, ATCC14487, Ru (Sneath), NCTC7150, HD
(Sneath) and the respective ATCC6915 dyes.

The dye of the genus Yanthinobacterium is a dark blue or purple blue dye. The dye is dissolved in 50% alcoholic water and organic solvents such as alcohol, acetone and toluene.

As a method for producing the dye of the genus Yanthinobacterium, it can be produced, for example, by the methods disclosed in Japanese Patent Publication No. 4-6347 and Japanese Patent Application Laid-Open No. 2-39892.

The amount of the pigment of the microorganism belonging to the genus Yantinobacterium used in the present invention is preferably 0.01 to 99.0% by weight based on the total amount of the ink composition.

The ink composition of the present invention can be used for writing and drawing on papers, cloths, plastics, glass, ceramics, metals, etc. as ink compositions for writing utensils, stamps, recording machines or copiers. Alternatively, it can be used not only for copying, but also for beauty accessories such as body painting.

Writing, drawing or copying with the ink composition of the present invention is water-resistant and clear. On the other hand, when exposed to visible light, the color rapidly fades, and eventually becomes colorless and completely disappears. The type of visible light may be natural light (sunlight) or artificial light such as a fluorescent light, and the extinction time can be adjusted by the intensity of visible light.

The time required for the ink composition of the present invention to completely disappear after the exposure of light to the light beam depends on the intensity of the light beam, the composition of the ink composition, the object to which the ink composition is used, and the like. Although it varies depending on the type, it can be eliminated in 4 to 6 hours with sunlight as shown in Examples described later.

[0015] The ink composition of the present invention comprises water, temperature, p
Since it is stable to H and the like, as long as a document or the like written with the ink composition is stored indoors in a dark place, characters, figures and tables printed on the document are stably protected.

[0016]

The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

Example 1 (Ink composition) Yanthinobacterium ribidum KK-217 strain dye 10 parts by weight Ethylene glycol monoethyl ether 75 parts by weight Ethanol 15 parts by weight A mixed liquid was completely dissolved by heating and stirring. A purple-blue ink composition was obtained.

Test Example 1 (Handwriting disappearance test by irradiation with sunlight) The ink composition of Example 1 was used for paper (white, high-quality paper), cloth (white, cotton), Pyrex glass, and polypropylene equipment. We wrote it down and left it at the window where the sunlight of August shines, and examined the time when the handwriting completely disappeared.
As a result, all disappeared completely after 6 hours.

Test Example 2 (Handwriting disappearance test by irradiation with fluorescent light) The ink composition of Example 1 was used for paper (white, high-quality paper), cloth (white, cotton), Pyrex glass, and polypropylene equipment. The handwriting was left standing at 30 cm under daylight fluorescent light, and the time required for the handwriting to completely disappear was examined. As a result, 2
After 4 hours, all disappeared completely.

Example 2 (Ink composition for ballpoint pen) Yantinobacterium ribidum KK-217 strain dye 10 parts by weight POE (15) nonylphenyl ether 2 parts by weight Xanthan gum 2 parts by weight Glycerin 4 parts by weight Sorbit 15 parts by weight Preservative Agent appropriate amount water 67 parts by weight

Among the above-mentioned components, a dye of Yanthinobacterium ribidum KK-217 strain, POE (15) nonylphenyl ether, glycerin and sorbite are mixed and dispersed in 20 parts by weight of water. Next, the dye dispersion and the remaining components are added to an aqueous xanthan gum solution obtained by stirring and mixing xanthan gum and 47 parts by weight of water with a mixer, and further mixed and stirred to obtain a purple-blue ink composition for a ballpoint pen. Was.

Test Example 3 (Handwriting disappearance test by irradiation with sunlight) Using the ink composition of Example 2, paper (white, high-quality paper), cloth (white, cotton), and Pyrex glass were used in the same manner as in Example 1. Then, the handwriting was written on a polypropylene device, left at a place near the window where the sunlight of August shines, and the time required for the handwriting to completely disappear was examined. As a result, all disappeared after 5 hours.

Example 3 (Ink composition for recording) Yantinobacterium ribidum KK-217 strain dye 10 parts by weight Toluene 90 parts by weight Yantinobacterium ribidum KK-217 strain dye was added to a toluene organic solvent and stirred. And completely dissolved to obtain a purple-blue ink composition.

Test Example 4 (Handwriting disappearance test by irradiation with sunlight) Using the ink composition of Example 3, paper (white, high-quality paper), cloth (white, cotton), and Pyrex glass as in Example 1 were used. Then, the handwriting was written on a polypropylene device, left at a place near the window where the sunlight of August shines, and the time required for the handwriting to completely disappear was examined. As a result, all disappeared after 4 hours.

[0025]

As described above, according to the present invention, after writing, copying, or drawing, the written, copied, or drawn thing is preserved and maintained as long as it is shielded from visible light or irradiated with relatively weak visible light. However, when it becomes unnecessary, it is possible to provide a decolorizable ink composition that can be rapidly colorless by irradiation with visible light at any time.

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) C09D 11/00-11/20 C09B 61/00 C09K 9/02 D06P 1/34

Claims (1)

(57) [Claims] 1. A decolorizable ink composition comprising a dye produced by a microorganism belonging to the genus Yantinobacterium.