JPS6071676A - Ink composition - Google Patents

Abstract

PURPOSE:A composition useful for felt pen, providing with black or dark cloth, etc. with clear image, eliminable with water, obtained by dispersing white pigment into an aqueous solution of polyethylene oxide in the presence of a surface active agent. CONSTITUTION:(B) White pigment (e.g., calcium stearate, etc.) is uniformly dispersed into an aqueous medium having dissolved (C) polyethylene oxide (one having preferably 100,000-1,500,000mol.wt., preferably futher (D) methyl cellulose,in the presence of (A) a surface active agent (e.g., polyoxyethylene alkyl phenyl ether, etc.), to give the desired ink composition. Preferably this composition has 0.05-5wt% component A, 2-10wt% component B, 0.05-10wt% component C, 0.05-10wt% component D, and 55-85wt% water.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink composition that is capable of writing desired lines on black to dark-colored fabrics and that allows the drawn lines to be erased with water.

Chaco is generally used as a marking tool when drawing drawing lines and cutting lines for the drawing below on fabric. It is difficult to erase when On the other hand, it is also known to draw lines on fabric with a felt-tip pen containing water-soluble dye ink and then erase them with water when they are no longer needed. The streaks do not give sharp coloring. That is, in the case of water-soluble dye ink, the dye is impregnated between the fibers of the fabric, so if the fabric is black or dark-colored, the image will not be clearly visible.

In view of the circumstances of the prior art as described above, the present inventor has developed an ink composition that can write clearly visible lines on black or dark-colored fabrics and that can erase the drawn lines with water. As a result of intensive research to develop a product, the present invention was completed.

That is, the present invention provides an ink composition characterized in that a white pigment is uniformly dispersed in an aqueous medium in which polyethylene oxide is dissolved in the presence of a surfactant.

When the ink composition of the present invention is used as an ink for a felt-tip pen or the like to write on cloth, the pigment adheres to the fibers of the cloth due to the action of polyethylene oxide and is impregnated between the fibers. Prevented. Therefore, even if the fabric is black or dark-colored, the lines written on it will be clearly visible.

In the present invention, a white pigment is used as the pigment. In this case, white pigment means a white solid substance that is substantially insoluble in water, and examples of such substances include metal soaps such as calcium stearate and aluminum stearate, titanium oxide, and lithopone. , zinc white, etc. This white pigment is contained in the ink composition.
It is used in a concentration of 1 to 20% by weight, preferably 2 to 10% by weight.

The surfactant promotes the dispersion of the pigment in the ink composition, and nonionic and anionic surfactants are optionally used. Its concentration is 0.01 to 7% by weight, preferably 1 to 0.05 to 5% by weight.

In this case, the nonionic surfactants include polyethylene glycol alkyl ether, polyethylene glycol fatty acid ester, sorbitan fatty acid ester, glycerin fatty acid ester, polyglycerin fatty acid ester,
Examples of anionic surfactants include propylene glycol fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, and polyoxyethylene alkyl amine. Examples include higher fatty acid alkali salts, alkyl phosphates, polyoxyethylene alkyl ether phosphates, alkyl sulfonates, alkylaryl sulfonic acids, acylamino acid salts, polyoxyethylene alkyl ether sulfates, sulfosuccinate ester salts, etc. It will be done.

As the surfactant, it is particularly effective to use one containing a polyoxyethylene group. Examples of such surfactants include polyoxyethylene fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene phytosterol, and polyoxyethylene sorbitan fatty acid ester. Oxyethylene/polyoxypropylene block polymer, polyoxyethylene alkylphenyl ether, polyoxyethylene castor oil, polyoxyethylene beeswax derivative, polyoxyethylene lanolin derivative, N-polyoxyethylene alkylamine, N-polyoxyethylene fatty acid amide, In addition to nonionic products such as polyethylene glycol fatty acid esters and polyoxyethylene nonylphenyl formaldehyde condensates, polyoxyethylene alkyl sulfate ester salts, polyoxyethylene acyl acetate-engineered chill salts, polyoxyethylene alkyl phosphate ester salts, etc. Examples include anionic ones.

In the present invention, polyethylene oxide is used to prevent the pigment from penetrating between the fibers of the fabric, and the molecular weight of this polyethylene oxide is usually about 100,000 to 5 million, preferably about 100,000 to 1.5 million. It is.

The concentration of polyethylene oxide in the ink composition is usually 0.01 to 15% by weight, preferably 0.05 to 15% by weight.
10% by weight.

In the present invention, it is further preferable to use methylcellulose in order to improve the dispersion stability of the ink composition.

By using this, the dispersion stability of the pigment increases,
Precipitation of pigment particles during storage is prevented. The amount of methylcellulose used in the ink varies depending on its molecular weight, but is usually 0.002 to 15% by weight, preferably 0.
．． It is in the range of 0.005 to 10%.

In the present invention, various thickeners can be further added as viscosity modifiers and anti-drying agents, and specific examples of such agents include glycerin, alkylene glycol, and polyamides with a molecular weight of up to 3θ0. Alkylene glycol is mentioned, and the thickener concentration in the 4° ink is 3~
40% by weight, preferably 5-30% by weight.

The water content in the ink composition of the present invention is usually 50 to 90
It is preferably in the range of 55 to 85 weight percent.

Further, in order to obtain an ink that has appropriate fluidity and exhibits good writability, it is preferable that the viscosity of the ink is in the range of 1.5 to 70 cps.

In the present invention, a commercially available oil-in-water white emulsion pigment can be used as the white pigment. This pigment is formed by using water as a continuous phase, emulsifying a water-insoluble organic solvent and resin in the presence of a surfactant (emulsifier), and then dispersing white pigment particles in water.

When using this white emulsion pigment, the ink composition of the present invention can be obtained by uniformly dispersing it in an aqueous medium containing polyethylene oxide.

The ink composition of the present invention is used as an ink for writing instruments such as ballpoint pens, felt-tip pens, and fountain pens, and is particularly preferably applied to black and dark-colored fabrics. The image drawn on the fabric using the ink composition of the present invention is prevented from being impregnated between the fibers and adheres to the fiber surface, so the white color appears clear and the image is clearly visible. When the top is rubbed with water or a cloth dampened with water, the polyethylene oxide that makes up the ink component dissolves.
At the same time as the white pigment is expanded, it is impregnated between the fibers of the fabric, and the lines are erased.

Next, the present invention will be explained in more detail with reference to Examples.

White pigment shown in Example Postscript Clothing-1, aqueous solution of polymeric substance,
An ink composition was obtained by uniformly mixing and dispersing the surfactant and the auxiliary agent in water.

Note that the symbols shown in Table 1 have the following meanings.

SC: Calcium stearate SA:
Aluminum stearate TO...Titanium oxide HW...Helizarin White 8 units (manufactured by BASF) PEO...Polyethylene oxide (molecular weight 100,000 to 250,000, used as a 3% aqueous solution) MC...
...Methyl cellulose (trade name: Marporose, manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd., product number M-400, used as a 1% aqueous solution) SA (I) ... Polyoxyethylene alkylphenyl ether 5A (II) ... Polyoxyethylene Alkylamine G
L...Glycerin Table 1 Next, each of the above ink compositions was separately impregnated into the filling of a felt-tip pen so that they oozed out from the pen core. When drawing lines on black cloth with these felt-tip pens, white lines were obtained in all cases.

Next, in order to erase this image, when the image was wiped with paper containing water, the image was dispersed and impregnated into the black fabric and erased.

Patent applicant Adgar Industries Co., Ltd. Representative Patent Attorney Toshiaki Ikeura

Claims (2)

[Claims] (1) An ink composition characterized in that a white pigment is uniformly dispersed in an aqueous medium in which polyethylene oxide is dissolved in the presence of a surfactant. (2) An ink composition characterized in that a white pigment is uniformly distributed in an aqueous medium in which polyethylene oxide and methyl cellulose are dissolved in the presence of a surfactant.