JPH06184486A - Aqueous marking pen ink composition for writing board - Google Patents

Abstract

PURPOSE:To obtain the subject ink composition consisting essentially of a pigment, a resin and a specific phosphoric acid ester compound in a solvent consisting essentially of water and further containing a release agent, and capable of simply erasing handwriting on a writing board called a white board with an erasing tool. CONSTITUTION:A pigment (e.g. carbon black) as a coloring agent, a resin (e.g. polyvinyl alcohol) and a release agent consisting of a phosphoric acid ester compound of the formula (R1 to R3 are acyl or alkyl) is blended in a solvent consisting essentially of water, and further, the bland is blended with a wetting agent (e.g. glyceral), an activating agent (e.g. fluorine-based surfactant) and an antiseptic agent to provide the objective aqueous marking pen ink composition capable of simply erasing with an erasing tool such as dry cloth or soft paper when handwriting on a writing board called white board and excellent is erasing property before drying of those handwritten.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous marking pen ink composition for a writing board, which is capable of easily erasing the handwriting on a writing board called a white board with an erasing tool such as a dry cloth or soft paper. .

[0002]

2. Description of the Related Art A marking pen ink composition for a writing board that erases a handwriting written on a non-absorbent or non-permeable writing board by wiping it with an erasing tool such as a dry cloth or soft paper is a coloring agent in a solvent, A release agent and a surfactant are dissolved together with the resin. In the past, most of the solvents used were highly volatile ketones and alcohols.

In such a marking pen ink composition for a writing board, ketones have strong toxicity and odor, and alcohols and methanol also have strong toxicity and odor. In addition, although ethanol has relatively low toxicity, it increases the cost of raw materials. Therefore, various aqueous marking pen ink compositions using a solvent containing water as a main component have been proposed.

[0004]

By the way, the conventionally proposed aqueous marking pen ink composition is an aqueous solution of the volatile solvent type idea of ketones and alcohols. Therefore, the handwriting can be erased well after it is dried.

However, the drying speed of the aqueous solvent is extremely slower than that of the volatile solvent, and it takes several tens of minutes for the drying especially in a humid environment. Therefore, the handwriting may be erased before it is completely dried, but in this case, the writing board surface becomes dirty,
There is a problem that it cannot be completely erased. That is, in a water-based marking pen ink composition that uses a solvent containing water as a main component, as in the case of the volatile solvent type, a nonvolatile liquid that is liquid at room temperature is simply provided between the mixed film of the colorant and the resin and the writing plate. It is difficult to deal with the method of erasing the handwriting by interposing a solvent.

Therefore, an object of the present invention is to provide an aqueous marking pen ink composition for a writing board, which is excellent in erasability before the handwriting is dried.

[0007]

In order to achieve such an object, the present invention is for a writing board containing a pigment as a colorant, a resin and a release agent as essential components in a solvent containing water as a main component. In the aqueous marking pen ink composition,
A phosphoric acid ester compound represented by the general formula 1 is used as a release agent.

[Chemical 1]

[0008]

The present inventors have conducted extensive studies to solve the above problems, and as a result, found that the phosphate ester compound represented by the general formula 1 is effective as a stripping agent, and It has been completed. Although it is not clear why the phosphate ester compound represented by the general formula 1 is effective in erasing the handwriting before drying, it is presumed as follows.

That is, the phosphoric acid ester compound represented by the general formula 1 is originally water-insoluble and has surface activity, but the phosphoric acid ester compound is also water-insoluble. Strongly adheres to the surface of the writing plate to weaken the adhesion of the pigment particles to the surface of the writing plate and enhances the force of adsorption to the fiber surface of the eraser. It is thought that it is small and can be erased neatly.

Each composition of the marking pen ink of the present invention will be described below. Since it is a water-based ink using water as a solvent, it does not have the problems of toxicity and unpleasant odor as in the case of a volatile solvent. However, lower alcohols such as ethanol and propanol may be contained as an auxiliary solvent. These lower alcohols disperse the pigment used as a colorant and act as a peeling aid, but the content thereof should be within 3% by weight based on the total amount of the ink. If it is contained more than this, it causes an unpleasant odor and loses its significance as a water-based ink.

A pigment is used as the colorant. As the pigment, for example, carbon black, phthalocyanine-based, azo-based, quinacridone-based synthetic or natural pigments are used. As these pigments, commercially available products that have been previously dispersed in water can be used. Further, such a pigment dispersant containing various resin dispersants and surfactants may be used.

Such a pigment is contained in an amount of usually 0.5 to 30% by weight, preferably 0.5 to 20% by weight, based on the total amount of the ink. When the pigment is contained in an excessive amount, the viscosity of the ink composition becomes too high, so that the writability is deteriorated and the erasability is also deteriorated. On the other hand, if it is too small, the handwriting density becomes too thin to be practical.

Next, as the resin, a water-soluble resin or an aqueous resin emulsion is used as a film forming agent. Examples of the resin include a water-soluble acrylic resin, polyvinyl alcohol,
A water-soluble resin such as polyvinylpyrroliton, polyvinyl acetate, polystyrene, an acrylic resin and an emulsion of a copolymer resin of these can be optionally used.

As described above, as the stripping agent, the phosphoric acid ester compound represented by the general formula (1) is used, and the amount of this compound is preferably 0.05 to 5% by weight with respect to the total amount of the ink. If it is contained excessively, the viscosity increases and the pigment easily condenses. On the contrary, if it is too small, the object of the present invention cannot be achieved.

Further, if necessary, a peeling aid is used. Examples of the peeling aid include aqueous emulsions of higher hydrocarbons, higher alcohols, aliphatic carboxylic acid esters, silicones and the like which are liquid at room temperature. . These peeling aids can be erased more easily because they enter between the film of the pigment and the resin and the writing plate after the handwriting is sufficiently dried. These peeling aids are used in an amount of 10% by weight or less based on the total amount of the ink.

In order to enhance the water dispersibility of the pigment or resin emulsion, and further enhance the leveling property of handwriting,
Various surfactants are used. The amount of these surfactants is 10% by weight or less, preferably 3% by weight, based on the total amount of the ink.
Used below. If added excessively, the erasability of handwriting will decrease.

Polyhydric alcohols such as glycol and glycerin, and pyrrolidones are used as a drying inhibitor for the nib and as a plasticizer for the dry film. Water-soluble high-boiling organic solvents such as alcohol amines can also be used. These are used in an amount of 30% by weight or less, preferably 10% by weight or less based on the total amount of the ink. If this is also added excessively, the erasability of the handwriting decreases. In addition to these additives, antiseptics, antifungal agents and the like may be used, if necessary.

[0018]

[Example 1]

Coloring agent Carbon black 4.0% Resin polyvinyl alcohol 2.0% Activator Florard FC-430 0.1% (3M Fluorine-based surfactant) Release agent Resinol LL-20 1.0% (Nippon Surfactant Co., Ltd.) Phosphate compound) Wetting agent Glycerin 3.0
% Preservative Proxel Xl-2 (manufactured by ICI) 0.1%

Example 2 Colorant Carbon black 4.0% Resin Polyvinyl alcohol 3.0% Activator Florard FC-430 0.1% Release agent Resinol LL-20 1.0% Wetting agent Glycerin 3.0% Preservative Proxel XL-2 0.1%

[Example 3] Colorant Carbon black 4.0% Resin polyvinyl alcohol 3.0% Activator Florard FC-430 0.1% Release agent Resinol LL-20 1.0% Silicone oil 4.0% Wetting Agent Ethylene glycol 3.0% Preservative Proxel XL-2 0.1%

[Example 4] Colorant Carbon black 4.0% Resin Sumikaflex S-900 5.0% (Sumitomo Chemical Co., Ltd. ethylene vinyl acetate emulsion) Activator Florard FC-430 0.1% Release agent Recinol S -10E 2.0% (a phosphoric acid ester compound manufactured by Nippon Surfactant Co., Ltd.) Wetting agent Ethylene glycol 3.0% Glycerin 1.0% Preservative Proxel XL-2 0.1%

Example 5 Colorant Phthalocyan Blue 4.0% Resin Polyvinyl Alcohol 3.0% Activator Florard FC-430 0.1% Release Agent Recinol S-10E 1.0% Wetting Agent Glycerin 3.0 % Preservative Proxel XL-2 0.1%

[Comparative Example 1] Colorant Carbon Flack 4.0% Resin Polyvinyl alcohol 2.0% Activator Florard FC-430 0.1% No release agent Wetting agent Glycerin 3.0% Preservative Proxel XL- 2 0.1%

Comparative Example 2 Colorant Carbon Black 4.0% Resin Polyvinyl Alcohol 2.0% Activator Florard FC-430 0.1% Release Agent Oleyl Alcohol 5.0% Wetting Agent Glycerin 3.0% Preservative Proxel XL-2 0.1%

Each of the inks prepared in the above formulation was used to write on the surface of a writing plate made of "enamel", and after 30 seconds (before drying), 5 minutes (after drying), and 1 week later, lightly using a dry cloth. The erasability of the handwriting was investigated by rubbing. The results are shown in Table 1. It should be noted that the evaluation is visually conducted in four-stage evaluation,
Very good is indicated by ⊚, good is indicated by ∘, slightly defective is indicated by Δ, and defective is indicated by ×.

[0026]

[Table 1] As can be seen from the above, the use of the phosphoric acid ester compound represented by the general formula as the stripping agent improves the erasability, and especially the erasability of the handwriting before drying.

[0027]

As described above, the present invention provides an aqueous marking pen ink composition for a writing board containing a pigment as a colorant, a resin and a release agent as essential components in a solvent containing water as a main component. In the above, since a phosphate compound represented by the general formula 1 is used as the release agent, the erasability before the handwriting is dried is particularly excellent, and the writing can be performed in the same manner as the conventional volatile type. A water-based marking pen ink composition for plates can be used.

Claims (1)

[Claims] 1. A solvent containing water as a main component, which contains a pigment as a colorant, a resin, and a release agent as essential components, and the release agent is a phosphate compound represented by the general formula (1). A water-based marking pen ink composition for a writing board, characterized in that [Chemical 1]