JPH1135869A - Highlighter ink for ohp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an OHP-highlighter ink used for coloring the highlighted portion of a toner image formed on an OHP sheet, not repelled, even when coated on the toner image, and capable of being wiped off with water. SOLUTION: This highlighter ink for OHP comprises 1-10 wt.% of a dye capable of being dissolved in water and alcohol, 70-95 wt.% of an alcohol and a resin capable of being dissolved in water and alcohol in such an amount as giving an ink viscosity of 2-20 mPa.S at 25 deg.C, and has a surface tension of <=250 dyn/cm. The alcohol is preferably ethanol, and the water is preferably contained in an amount of 0.5-15 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION Overhead projectors (hereinafter abbreviated as OHPs) are widely used in lectures, conferences, school lectures, etc., and their manuscripts are created by baking by dry electrophotography or by directly writing on sheets. Is done. The present invention relates to a highlighter ink capable of coloring a portion of a character or image formed on a sheet to be emphasized by electrophotography or the like and wiping and erasing the colored portion with water.

[0002]

2. Description of the Related Art In some cases, it is desired to color a character or an image to be emphasized on an OHP sheet by using a copying machine, a laser beam printer, or the like. At this time, if a normal water-based marker, oil-based marker, or OHP marker is used, the ink may be repelled by the effect of the toner component forming the image, and the toner resin may be melted by the ink. . In addition, because the ink density is not appropriate, characters may not be readable when projected on a screen. Also, if you try to remove the emphasis,
Inconveniences such as not being able to remove ink or removing toner together with ink occur. Although a method of attaching a transparent colored film is also performed, it is troublesome to cut and paste the film into a desired shape.

JP-A-8-157773 discloses an oil-based marking pen ink composition containing a colorant, a resin, a diglycerin monofatty acid ester and an organic solvent as essential components. It is quick drying on the ink impervious surface, but aims to provide handwriting that does not cause whitening phenomenon.
It is an ink composition for oil-based marking pens that can be applied to ink-impermeable surfaces such as paper, cardboard, etc. This oil-based ink composition is presumed to be an ink to be written on an OHP sheet or to be written on a blank portion of a copied sheet, but is not specified. This is because in the process of drying the handwriting on the ink impervious surface, the heat of vaporization that is taken away when the organic solvent evaporates causes the moisture in the air to condense and cause the handwriting to whiten, but this whitening phenomenon is suppressed. It is an oil-based ink composition, and handwriting cannot be wiped off with water.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide an OHP highlighter ink for coloring an emphasized portion of a toner image formed on an OHP sheet in view of the above-mentioned conventional situation. An object of the present invention is to provide a highlighter ink for OHP which does not repel ink applied thereon and which can be erased by wiping off the ink once marked with water.

[0005]

The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have found that 1 to 10% by weight of a dye which is soluble in water and alcohol, and a resin which is soluble in water and alcohol. The viscosity of the ink at 25 ° C is 2
An ink dissolved in alcohol in a range of ２０20 mPa · S, and has a surface tension of 24 dyn / cm at 25 ° C.
It has been found that the object is achieved by using the following inks as a highlighter for OHP, and the present invention has been achieved. 0 to 15% by weight, preferably 0 to
Up to 10% by weight of water may be used as a dissolution aid for the dye. When the amount of water exceeds 15% by weight, uneven coating occurs when used for the purpose of the present invention. If the surface tension of the ink is 2
A surfactant may be added in order to make it 4 dyn / cm or less. It is preferable that the alcohol of the solvent is ethanol.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Dyes used in the composition of the present invention include CI Acid Yellow 36, 40, 73 Acid Orange 7, 20 Acid Red 49, 52, 87, 88, and 92. , 94, 95, Acid Violet 9, Acid Blue 5, 9, 9, 74, Acid Green 3 Food Blue 2, Basic Yellow 1, 2, 11, 11, 14, 36, Basic Orange 15. , 21, Basic Red 1, 2, 9, 12, 37, Basic Violet 1, 3, 10, 14, Basic Blue 1, 3, 5, 7, 9, 9 24, 25, 26, 28, 29, Basic Green 1, 4, CI Basic Brown 1 D Direct Yellow 24, 26, 98, Direct Orange 6, 8 and 26, Direct Red 1, 4 and 28, Direct Violet 98, Direct Green 1, Direct Brown, 59 and 44 , 106, Direct Black 17, and the like. The amount of the alcohol-soluble dye used is 10% by weight or less. However, when the ink is too dark, characters projected with a highlighter become difficult to read when projected on a screen. However, the appropriate dye concentration for making the underlying characters stand out depends on the color, and a light color such as yellow can be used even at 10% by weight or more. Since the amount of dye soluble in water and alcohol is 10% by weight or more, the upper limit is set to 10% by weight.

As a resin soluble in both water and alcohol used in the present invention, polyvinylpyrrolidone (PV
P) K15, K30, K60, K90, polyethylene oxide, methyl vinyl ether / maleic anhydride copolymer, and the like. These resins are used in a range where the viscosity of the ink at 25 ° C. becomes 2 to 20 mPa · S, more preferably 3 to 10 mPa · S. If it exceeds 20 mPa · S, the outflow of ink from the pen tip tends to be blurred.

[0008] The alcohol used in the present invention is preferably ethanol from the viewpoint of safety, but does not exclude the inclusion of other low-boiling alcohols. Preferably, it is unmodified with a purity of 99% or more. This alcohol is a main component in the ink composition, and is used in an amount of 70% by weight or more of the whole ink composition. When the solid content is increased and the alcohol content is less than 70% by weight, the viscosity becomes high and writing blur occurs. In addition, when the amount of alcohol is reduced to less than 70% by weight, repelling of handwriting is generated.
When a part of alcohol was replaced with a water-soluble organic solvent such as glycerin or triethylene glycol, problems such as repelling of handwriting and slowing down of handwriting occurred. In addition to ethanol, 0 to 15% by weight of water may be added in addition to ethanol in order to increase the solubility of the dye. 90% or more. Further, a surfactant such as a fluorine-based surfactant may be added to reduce the surface tension of the ink.

[0009]

The highlighter ink for OHP of the present invention is quick-drying and has a low surface tension, so that it can be written on the sheet surface contaminated with the toner component, and the ink component remaining on the sheet after writing and drying is water-soluble. If the user wants to erase the emphasized part, the original can be easily restored to the original before the emphasis mark by wiping with paper or cloth wet with water or rinsing with water.

[0010]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples. In addition, in the following examples, unless otherwise specified, the compounding amount indicates% by weight.

(Example 1) The following components were sufficiently mixed and stirred to obtain a blue highlighter ink composition for OHP. Use the obtained ink with felt-tip pen PROPUS PUS-1
00, manufactured by Mitsubishi Pencil Co., Ltd., and evaluated as described below. Food Blue Dye No. 1 (manufactured by Daiwa Chemicals) 1.5% by weight polyvinylpyrrolidone (PVP K30) 5〃 ethanol 93.5〃

Example 2 The following ingredients were mixed and stirred sufficiently to obtain a red highlighter ink composition for OHP. Use the obtained ink with felt-tip pen PROPUS PUS-1
00, manufactured by Mitsubishi Pencil Co., Ltd., and evaluated as described below. Edible Red Dye No. 104 (manufactured by Daiwa Kasei) 1.5% by weight polyvinylpyrrolidone (PVP K30) 5５ water 5〃 ethanol 88.5〃

Example 3 The following components were mixed and stirred sufficiently to obtain a blue highlighter ink composition for OHP. Use the obtained ink with felt-tip pen PROPUS PUS-1
00, manufactured by Mitsubishi Pencil Co., Ltd., and evaluated as described below. Food Blue Dye No. 1 (manufactured by Daiwa Kasei) 1.5% by weight polyvinylpyrrolidone (PVP K30) 5 {water 10} fluorine-based surfactant {fluorard FC170C (manufactured by 3M)} 0.3 {ethanol 83.2}

(Comparative Example 1) In the case where water is 15% by weight or more and surface tension is 25 dyn / cm or more The ink is filled in a felt-tip pen (Propath PUS-100, manufactured by Mitsubishi Pencil Co., Ltd.), and the following evaluation is performed. Was. Floxine 1.5% by weight PVP K-30 5 {water 20} ethanol 73.5}

Comparative Example 2 Alcohol is less than 70% and surface tension is 25 dyn / cm.
In the above cases, the ink was filled into a felt-tip pen (Propath PUS-100, manufactured by Mitsubishi Pencil Co., Ltd.) and evaluated as described below. Brilliant Blue FCF 1.5% by weight PVP K-30 5 Ethanol 47 Water 46.5

(Comparative Example 3) In the case where the viscosity is 20 mPa · S or more The ink was filled into a felt-tip pen (Propass PUS-100, manufactured by Mitsubishi Pencil Co., Ltd.) and evaluated as described below. Floxine 1.5% by weight PVP K-30 15 {water 10} ethanol 73.5}

Evaluation items (Viscosity) Using an ELD type viscometer (manufactured by Tokyo Keiki Co., Ltd.)
The measurement was performed at 25 ° C. and 20 rpm. Viscosity: unit m
Pa · S (Surface tension) Each sample (ink) was measured in an environment of 25 ° C. using a CBVP surface tensiometer manufactured by Kyowa Kagaku Co., Ltd. Surface tension: unit dyne / cm

(Writability) O
It was applied to a portion of the toner image formed on an HP sheet (OHP film TY-901E made by 3M) to be emphasized, and the uniformity of the coating film was examined.

(OH Projection) OH prepared by writability test
The P sheet (marked in the emphasized portion) was projected on the screen by the OHP projector, and it was checked whether or not the characters in the portion emphasized by the pen could be read. Evaluation: ○ The manuscript can be read. × The original cannot be read. △ It is faded by straight line drawing (quick writing), but there is no problem if you write slowly.

(Erasability) The marks on the OHP sheet created in the writability test, which were emphasized by the pen, were wiped off with paper wet with water to check whether or not the ink adhered by the pen could be wiped clean.

The results of testing the ink compositions of Examples 1 to 3 and Comparative Examples 1 to 3 by the above evaluation method are shown in the following table.

[0022]

[Table 1]

[0023]

The highlighter ink for OHP of the present invention is quick-drying and has a low surface tension, so that it can be written on a sheet surface contaminated with toner components. The ink components remaining on the sheet after writing and drying are water-soluble, so if you want to erase the emphasized area, wipe it off with paper or cloth moistened with water, or wash it off with water to make it easy to attach the emphasis mark to the original. Can be restored. Since ethanol is used as a main component as a solvent, it is safe.

Claims (3)

[Claims] 1. A dye that is soluble in water and alcohol, a resin that is soluble in water and alcohol, and an alcohol as essential components. The dye that is soluble in water and alcohol is 1 to 10% by weight, and the alcohol is 70%. Highlighter ink composition for OHP which contains a resin soluble in water and alcohol at a temperature of 25 ° C. in a range of 2 to 20 mPa · S and a surface tension at 25 ° C. of 24 dyn / cm or less. Stuff. 2. The method according to claim 1, wherein the alcohol is ethanol.
The highlighter ink composition for OHP according to the above. 3. The highlighter ink composition for OHP according to claim 1, comprising 0.5 to 15% by weight of water.