JP2001002972A - Aqueous marking ink composition for white board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an aqueous marking ink for white boards. SOLUTION: This aqueous marking ink for white boards is such one as to contain cetyl 2-ethylhexanoate as a releasing agent, polyvinyl alcohol and water-soluble polysaccharides obtained by extracting from soybeans and refining.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous marking ink which can be written on a writing board typified by a whiteboard, and more particularly to an aqueous ink which can be easily erased with a dry cloth or soft paper after writing. It is about.

[0002]

2. Description of the Related Art Solvent-based marking inks for whiteboards are still the mainstream at present, but water-based inks have been frequently developed due to problems of odor and safety during use. Have been. For example, there are JP-A-10-25442 and JP-A-11-80645.
However, these are expensive because they use special materials.

[0003]

Means for Solving the Problems We have intensively studied to produce a high-performance aqueous ink using inexpensive materials, and finally succeeded in developing a new ink. By using cetyl 2-ethylhexanoate as a release agent and using polyvinyl alcohol and a polysaccharide purified from soybean in combination as a water-soluble resin, an aqueous high-performance whiteboard marking ink can be easily obtained.

The cetyl 2-ethylhexanoate used in the present invention may be freely selected from commercially available products, and one example is Kao's Exepearl HO. The product is used in the form of an emulsion. For example, as shown in the catalog of Kao, 25 parts of Exepearl HO, 5 parts of Rheodol 440 and 70 parts of water were mixed at 70 ° C. to obtain an emulsion. The amount of Exepearl HO used is 1 to 10 (%) in the ink. If it is less than 1 (%), the erasability of the handwriting is poor, and if it is more than 10 (%), the drying property of the handwriting is poor.

[0005] The polyvinyl alcohol used in the present invention may be appropriately selected from commercially available products. For example, Gohsenol GL-03 of Nippon Gohsei. The amount used is preferably 1 to 10 (%) in the ink. Further, it is essential that soyafive S used in the present invention be used together with the above-mentioned polyvinyl alcohol, and the used amount is 10 to 80 (%) of the polyvinyl alcohol. If the amount of polyvinyl alcohol is less than 1 (%), the erasability will be poor. If the amount is more than 10 (%), the viscosity of the ink will increase and the smooth ink will not come out of the pen.

[0006] When Soyafive S is used, the ink handwriting becomes uniform and the handwriting can be dried more quickly. In addition, the stability of the ink is improved, and good performance is maintained over a long period of time.
If the amount of Soyafive S is too large, the erasability of handwriting is inferior.

[0007] The pigment used in the present invention is not particularly limited.
You can choose from commercial products. For example, carbon black, indanthrone blue, phthalocyanine green, and the like. Dispersing the powdered pigment in water is usually performed using a dispersant or a surfactant. In the present invention, there is no exception, and a dispersant or a surfactant suitable for the pigment used may be used. Commercially available disperse pigments can also be used. For example, there are Sanyo Super Red BS and Sandai Super Green LXB of Sanyo Dye.

[0008]

Next, the present invention will be described in more detail with reference to examples.

[0009]

Example 1 10 parts of Sanyo Sperred BS, a dispersion pigment made of Sanyo Dye, polyvinyl alcohol G manufactured by Nippon Gohsei
40 parts of a 20% aqueous solution of L-03, 10 parts of a 25% emulsion of cetyl exepar HO 2-ethylhexanoate manufactured by Kao, 2 parts of Soyafive S made by Fuji Oil, and 40 parts of water
Parts were uniformly mixed to obtain an ink. When this ink was filled in a marker and written on a white board, drying was quick and erasability was good.

[0010]

Example 2 50 parts of water, 2 parts of Gohsenol GL-03
25% of 0% aqueous solution, Kao surfactant reodol 44
0 and 2 parts of Soyafive S were uniformly mixed and dispersed in a glass bead according to a conventional method. Subsequently, 20 parts of a 25% emulsion of Exepearl HO was added to obtain an ink. When this ink was filled in a marker and written on a white board, drying was quick and erasability was good.

[0011]

Comparative Example An ink was obtained in the same manner as in Example 2 except that Soya Five S was not added. When this ink was filled in a marker and written on a white board, drying was slow, the writing line was uneven, and the erasability was poor.

[0012]

The ink of the present invention is extremely useful as an aqueous marking ink for white boards.

Claims (1)

[Claims] 1. A system containing water, a pigment, a pigment wetting agent or a pigment dispersant, a release agent, and a water-soluble resin as essential components, wherein the release agent is cetyl 2-ethylhexanoate and the water-soluble resin is polyvinyl alcohol. And a water-soluble polysaccharide separated and purified from soybean.