JPH06279724A - Water-base pigment ink for use on white board - Google Patents

Abstract

PURPOSE:To obtain the ink which is produced without using any organic solvent and can be readily and completely wiped off with, e.g. a dry cloth or paper by compounding a specified release agent with a coloring agent, a binder and water. CONSTITUTION:To produce the ink containing a coloring agent, a binder, a release agent and water as the essential constituents, wherein the release agent comprises a water-soluble high-molecular polyoxyalkylene glycol compound prepared by polymerizing propylene oxide or ethylene oxide and having a viscosity of at most 150cp at 25 deg.C. This ink provides a clear writing on a white base material made of, e.g. ceramic or plastic and having a nonabsorbent smooth surface and, after drying, can be readily and completely wiped off with, e.g. a dried cloth, paper or felt. Since it is a water-base ink produced without using any organic solvent, it has a very wide industrial applicability from in view of, e.g. the preservation of environment and health control.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a clear handwriting on a white base material whose surface is non-absorbing and smooth, and can be easily wiped with a dry cloth, paper, felt, etc. It also relates to a water-based pigment ink for whiteboard that can be completely wiped off.

[0002]

2. Description of the Related Art Heretofore, most ink compositions of this type are composed of an organic solvent as a solvent, a dye or pigment as a colorant, various natural and synthetic resins as a binder, and a release agent. However, in recent years, environmental pollution due to organic solvents has been taken up as a major problem, and water-based inks that do not use organic solvents have been earnestly desired, and water-based inks such as felt-tip pens and ballpoint pens have already been commercialized.
However, the water-based marker for whiteboard has not been commercialized yet. The main reason for this is that we could not produce an ink that could be completely wiped off without staining the white plate.

[0003]

The ink according to the present invention comprises a colorant, a binder, a release agent and water, wherein the release agent is a water-soluble polyoxyalkylene glycol polymer compound. The present invention provides a water-based pigment ink for whiteboard which can be easily and completely wiped off with a dry cloth or paper without using a solvent.

[0004]

In order to solve the above-mentioned problems, the present invention relates to a water-based pigment ink for whiteboard, which contains a colorant, a binder, a release agent and water as essential components, and the release agent characterizing the present invention. It is considered that the water-soluble polyoxyalkylene glycol-based polymer compound as is a high boiling point liquid substance, remains in the ink film, and maintains the peeling effect even after the handwriting is left for a long time and dried. The release effect is sufficient if the water-soluble polyoxyalkylene glycol polymer compound in the ink is 1 part by weight or more per 100 parts by weight of the ink, but the release effect function when there is a long standing period after writing on the white plate 5 to 10
Parts by weight are preferred. As the colorant, both organic pigments and inorganic pigments can be used. Various water-soluble resins can be used as the binder. When the above pigment is dispersed and used with the binder and the release agent claimed in the present invention, the dispersed pigment preferably has a particle size of 1 μm or less. The amount of the colorant is preferably 2 to 20 parts by weight per 100 parts by weight of the ink. The ink viscosity is 2-10 cp, which is suitable for writing.
s / 25 ° C is desirable. The ink system is water,
For adjusting the viscosity and surface tension of the ink, it is possible to use a small amount of a solvent that is compatible with water to adjust the drying speed of the handwriting and improve the dispersibility of the pigment.

[0005]

EXAMPLES The present invention will be described below with reference to examples.

(Example 1) 21% by weight FR-14 6 g made by Kao Corporation ADEKA CARPOL MH-50 1 g made by Asahi Denka Kogyo Co., Ltd. water 90 g carbon black MA-100 3 g made by Mitsubishi Kasei Kogyo Co., Ltd. Was applied to a disperser and then filtered to obtain a black ink.

Example 2 Adeka Carpol MH-20 5g Asahi Denka Kogyo Co., Ltd. 34% Johncryl 62 10 Johnson Co. Water 80 g Fuji Fast Red 1010 5g Fuji Dye Co. Ltd. Disperser After that, it was filtered to obtain a red ink.

(Example 3) Adeka Carpol MBF-100 8g Asahi Denka Kogyo Co., Ltd. 30 wt% Alastar 703S 15g Arakawa Chemical Co., Ltd. Water 71g Rionol Green YS-07 6g Toyo Ink Mfg. Co., Ltd. After the above process was applied to a disperser, it was filtered to obtain a green ink.

(Example 4) ADEKA CARPOL ML-250 8g Asahi Denka Kogyo Co., Ltd. Gohsenol GL-03 4g Nippon Synthetic Chemical Industry Co., Ltd. water 84g Fastogen Blue GNPT 4g Dainippon Ink Mfg. Co., Ltd. After the above process was applied to a disperser, it was filtered to obtain a blue ink.
The inks obtained in Examples 1 to 4 are filled in felt pens, written on a white plate, and left for one day and night. After standing, it was wiped and tested with a dry cloth or paper. The test results were very good.

[0010]

The ink of the present invention comprising the above components gives a clear handwriting to a white base material made of ceramics or plastics having a non-absorbent and smooth surface, and a dry cloth or paper after drying. It could be wiped off easily and completely with felt. Since this ink is a water-based ink that does not use organic solvents, it is considered to have extremely high industrial applicability for environmental protection and health management.

Claims (1)

[Claims] 1. A colorant, a binder, and
It consists of a release agent and water, and the release agent is a water-soluble polyoxyalkylene glycol-based polymer compound obtained by polymerizing propylene oxide (PO) or ethylene oxide (EO), and has a viscosity of 150 CPS / 25 ° C or less. A water-based pigment ink for whiteboard that can be easily and completely wiped off.