JP2662884B2 - Green marking pen ink composition for electronic blackboard - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a whiteboard capable of copying characters and figures (hereinafter simply referred to as handwriting) written on a board surface, such as a copy board, a copy blackboard, and an OA board. The present invention relates to a green marking pen ink composition for a board or a color board (hereinafter collectively referred to as an electronic blackboard), and more particularly to a green marking pen ink composition for an electronic blackboard capable of obtaining a clear copy. is there.

(Prior Art) In recent years, whiteboards or colorboards made of enamel or synthetic resin have become extremely popular in place of blackboards that use chalk, which has been used in the past. 2. Description of the Related Art Electronic blackboards that copy handwriting based on the principle of irradiating light and converting reflected light into an electric signal by a CCD image sensor or the like are widely used.

As a marking pen for this electronic blackboard, a colorant, an organic solvent, a resin soluble in the organic solvent, and a release agent are at least composed of a coloring agent, an organic solvent, and a release agent so that repeated use can be easily performed. What used the erasable ink for writing boards of the type which can be erased by rubbing is used.

(Problems to be Solved by the Invention) However, when a marker filled with the above-mentioned conventional erasable ink for a writing board is used, handwriting with black, red, and blue inks can be obtained in a clear copy, although a clear copy can be obtained. However, there is a problem that a clear copy cannot be obtained with handwriting using the above ink.

The inventors of the present invention have conducted intensive studies on the above problem, and as a result, the lightness (Y value, unit%) of the handwriting of the green ink is different between the handwriting using the black, red, and blue inks and the handwriting using the green ink. It was lower than the handwriting of inks of other colors, which led to the finding that a clear copy could not be obtained with handwriting with green ink.

This is because the green pigment, which is a colorant used in the conventional green ink, has a high saturation, so that even if the lightness of the handwriting is low, it can be sufficiently recognized as a handwriting. When the amount increases, the viscosity of the ink increases, the ink discharge from the marking pen becomes worse, and the ink tends to be clogged at the pen tip. Things.

In view of the above problems, an object of the present invention is to provide a green marking ink composition that does not hinder practical use and that can obtain a clear copy on an electronic blackboard.

(Means for Solving the Problems) The present invention has been made to solve the above problems, and includes a colorant comprising a green pigment as a main component and a blue pigment as a subcomponent; A marking pen ink composition comprising at least an organic solvent; a resin soluble in the organic solvent; and a release agent; and the lightness (Y value; unit%) of the handwriting is
The gist of the present invention is a green marking pen ink composition for an electronic blackboard, which is 40 or less.

 Hereinafter, each component of the present invention will be described in detail.

Colorant used in the marking pen ink of the present invention,
It is composed of a green pigment as a main component and a blue pigment as a subcomponent.

The green pigment is not limited as long as it can be stably dispersed in the ink composition, and a conventionally known green pigment can be used. Specifically, phthalocyanine green, cobalt green, emerald green, malachite green lake and the like can be used.

Blue pigments can be used without limitation as in the case of the green pigments.
Specifically, phthalocyanine blue, indanthrone blue, cobalt blue, cerulean blue, manga blue, fast sky blue and the like can be used.

In selecting a pigment, a processed pigment having a pigment-coated resin surface is preferred from the viewpoint of dispersibility, stability over time, and workability.

The amount of the green pigment as the main component described above is 1 to 10% by weight, preferably 2 to 8% by weight, based on the total amount of the ink, and the amount of the blue pigment as the auxiliary component is 0.1 to 2% by weight.
Preferably it is 0.2 to 1.7% by weight.

Examples of the organic solvent include alcohols such as ethanol, propanol, isopropanol and butanol, ketones such as methyl ethyl ketone and methyl isobutyl ketone, esters such as ethyl acetate and butyl acetate, aromatic hydrocarbons such as benzene, toluene and xylene, and cyclohexane. ,
Alicyclic hydrocarbons such as ethylcyclohexane, hexane,
Examples thereof include aliphatic hydrocarbons such as heptane, cellosolves such as ethylene glycol monoethyl ether, and carbitols such as diethylene glycol monobutyl ether. These can be used alone or as a mixture of two or more, and the amount of use is 55 to 90% by weight, preferably 65 to 85% by weight based on the total amount of the ink.

Resins soluble in organic solvents, as a pigment dispersant,
It is used for imparting film forming ability, imparting adhesion to a writing surface, and adjusting the viscosity of ink. Conventionally used natural resins and synthetic resins can be used. Specifically, rosin,
Rosin ester, rosin modified glycerin ester, rosin modified maleic acid resin, rosin modified phenol resin, rosin modified resin such as rosin modified phenol glycerin ester, cellulose resin such as ethyl cellulose and nitrocellulose, petroleum resin, ketone resin, polyvinyl butyral, chloride A vinyl-vinyl acetate copolymer is exemplified. The amount used is preferably 1 to 3% by weight based on the total amount of the ink.

However, when a processed pigment having the pigment surface coated with a resin is used as a pigment, it is needless to say that no additional resin is required.

The release agent is soluble in the organic solvent, has a lower vapor pressure than the organic solvent, and has a property of being hardly volatile or nonvolatile. Specifically, higher fatty acid esters,
There are higher aliphatic hydrocarbons. These can be used alone or in combination of two or more. The amount used is preferably 1 to 10% by weight based on the total amount of the ink.

In addition, various additives such as an antiseptic / antifungal agent and an antifoaming agent can be appropriately used in addition to the above components, if necessary.

Further, the marking pen ink composition of the present invention can be easily obtained by mixing and dispersing each component with a dispersing machine such as a homomixer, a ball mill, and a laboratory mixer.

(Action) The reason why the green marking pen ink composition for an electronic blackboard of the present invention can be copied clearly is presumed as follows.

That is, as described above, the principle of copying using an electronic blackboard is to change the reflected light of the light irradiated on the board surface into an electric signal using a CCD image sensor or the like and reproduce the handwriting on copy paper. The handwriting portion and the non-handwriting portion are distinguished by a potential that varies according to the amount of received light, that is, the amount of reflected light. Therefore, in order for a handwriting to be copied, the reflected light from the handwriting portion needs to be reflected. It is a condition that there is little.
In other words, even if the handwriting has the same color tone, the lower the brightness, the easier it is to copy.

That is, the marking pen ink composition for an electronic blackboard according to the present invention is used as a colorant, by mixing a blue pigment as an auxiliary component with respect to a green pigment which is a main component, and has a lightness of handwriting of 40 or less. As a result, a clear copy can be obtained.

This is because the color mixture of the pigments is a subtractive color mixture, so that when the green pigment and the blue pigment are mixed, the brightness is reduced as compared with the case of the same usage amount. Furthermore, blue is black,
Unlike the case where other color pigments such as red are mixed, the color tone of the green pigment which is the main component can be maintained, so it is hard to cause practical problems and it is a green ink that can obtain a clear copy. be able to.

(Examples) Hereinafter, the present invention will be described in more detail with reference to Examples.
In the examples, “parts” simply indicates “parts by weight”.

Example 1 Fuji AS Green (processed pigment, phthalocyanine green 50)
6% by weight Hez AS Blue (Processed pigment, phthalocyanine blue 50% by weight, polyvinyl butyral 50% by weight, Fuji Dye Co., Ltd.)
0.8 parts Ethanol 45 parts Isopropanol 38.7 parts Hexadecyl 2-ethylhexanoate 6.5 parts Emulgen 408 (polyoxyethylene oleyl ether, manufactured by Kao Corporation) 3.0 parts By stirring the above components with a homomixer for 2 hours, A green marking pen ink composition was obtained.

Example 2 Fuji IK Green (processed pigment, 50% by weight of phthalocyanine blue / vinyl chloride vinyl acetate copolymer, 50% by weight, manufactured by Fuji Dye Co., Ltd.) 6 parts Fuji IK Blue (processed pigment, 50% by weight of phthalocyanine blue / chlorinated) 50% by weight of vinyl vinyl acetate copolymer, manufactured by Fuji Dye Co., Ltd. 1 part Butyl acetate 32 parts Methyl ethyl ketone 43 parts Methyl isobutyl ketone 7 parts Normal butyl stearate 8 parts Liquid paraffin 3 parts By stirring for a time, a green marking pen ink composition was obtained.

Example 3 Phthalocyanine green (manufactured by Fuji Dye Co., Ltd.) 3 parts Phthalocyanine blue (manufactured by Fuji Dye Co., Ltd.) 0.4 part Vinyl chloride / vinyl acetate copolymer 3.4 parts Butyl acetate 32 parts Methyl ethyl ketone 43 parts Methyl isobutyl ketone 7 parts Normal butyl Stearate 8 parts Liquid paraffin 3 parts Among the above components, phthalocyanine green, phthalocyanine blue, vinyl chloride vinyl acetate copolymer and butyl acetate are kneaded in a three-roll mill, and the other components are added thereto. By stirring for a time, a green marking pen ink composition was obtained.

Comparative Example 1 A green marking ink composition was obtained in the same manner as in Example 1, except that Fuji AS Blue was added and isopropanol was added.

Comparative Example 2 A green marking pen ink composition was obtained in the same manner as in Example 2, except that Fuji IK Blue was added and butyl acetate was added accordingly.

(Effect of the Invention) As described above, the marking pen ink compositions obtained in Examples 1 to 3 and Comparative Examples 1 and 2 are filled into a writing implement having a fiber bundle ink reservoir and a fiber nib to obtain a sample. And tests. Table 1 shows the results.

In each of the samples filled with the marking pen inks obtained in Examples 1 to 3 and Comparative Examples 1 and 2, good green handwriting was obtained.

As described above in detail, the green marking pen ink composition for an electronic blackboard according to the present invention can obtain a good handwriting in green and a clear copy.

Claims (1)

(57) [Claims] 1. A marking pen comprising at least a colorant comprising a green pigment as a main component and a blue pigment as a subcomponent; an organic solvent; a resin soluble in the organic solvent; and a release agent. A green marking pen ink composition for an electronic blackboard, wherein the lightness of the handwriting (Y value: unit%) is 40 or less.