JP2008031323A - Oily marking pen ink composition for writing board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oily marking pen ink composition for writing boards erasable of a handwriting certainly, even if after a long period of time passed, independent of a material of the writing board. <P>SOLUTION: This oily marking pen ink composition for writing boards comprises a pigment, a resin, an organic solvent and a dialkyl carbonate represented by following general formula (1): R<SB>1</SB>-O-CO-O-R<SB>2</SB>(wherein R<SB>1</SB>and R<SB>2</SB>are each a 12-30C alkyl group), in which the dialkyl carbonate is used in a range of 3 to 20 wt.% based on the total amount of the ink composition. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an oil-based marking pen ink composition for a writing board. In detail, it is related with the oil-based marking pen ink composition for writing boards which can erase a handwriting reliably irrespective of the material of a writing board.

Conventionally, oil-based inks for writing boards used for writing boards (whiteboards) made of materials such as enamel, glass, metal, or thermoplastic or thermosetting plastics can be scrubbed and erased. For this reason, a release agent is added, and a release agent using a trimethylolalkane-fatty acid ester as the release agent is disclosed (for example, see Patent Document 1).
However, the ink added with the fatty acid ester described in the above-mentioned patent document has poor erasability depending on the material of the writing board and cannot be erased unless it is strongly rubbed. Even then, the handwriting could not be completely erased and remained.
Japanese Patent Laid-Open No. 60-4574

  The present invention is intended to solve the problems of the conventional oil-based marking pen ink composition for writing boards, that is, the handwriting can be reliably ensured even after a long period of time regardless of the material of the writing board. It is an object of the present invention to provide an oil-based marking pen ink composition for a writing board that can be scratched and erased.

The present invention requires an oil-based marking pen ink composition for a writing board comprising a pigment, a resin, an organic solvent, and a dialkyl carbonate represented by the following general formula (1).
R ₁ —O—CO—O—R ₂ (1)
(Here, R ₁ and R ₂ represent an alkyl group having 12 to 30 carbon atoms)
Further, the dialkyl carbonate is added in an amount of 3 to 20% by weight based on the total amount of the ink composition, a polyoxyalkylene alkyl ether sulfate, a polyoxyalkylene alkyl aryl ether sulfate, a polyoxyethylene alkyl ether phosphorus. It is a requirement to include one or more selected from acid esters or salts thereof.

  According to the present invention, it is possible to provide an oil-based marking pen ink composition for a writing board capable of reliably scratching and erasing the handwriting even after a long period of time has elapsed since the writing was formed, regardless of the material of the writing board.

  In the present invention, excellent erasability can be obtained by adding a specific dialkyl carbonate represented by the general formula (1) as a release agent to the ink.

R ₁ and R ₂ of the dialkyl carbonate represent an alkyl group, and an alkyl group having 12 to 30, preferably 14 to 22 carbon atoms is used. Those having less than 12 carbon atoms cannot be applied because of poor performance as a release agent.
The dialkyl carbonate can be added in an amount of 3 to 20% by weight, preferably 5 to 18% by weight, based on the total amount of the ink composition.

In addition, together with the dialkyl carbonate, one or more selected from sulfuric acid ester of polyoxyalkylene alkyl ether, sulfuric acid ester of polyoxyalkylene alkyl aryl ether and polyoxyethylene alkyl ether phosphate ester or salts thereof may be used in combination. Is preferred. By using the ester and salt together, the surface material is enamel, inorganic materials such as metal, thermosetting melamine resin, thermosetting polyester resin, polypropylene, fluororesin, etc. Regardless of the surface material, not only immediately after writing, but also handwriting that has been left for a long time can be erased more easily.
Furthermore, other general-purpose release agents such as carboxylic acid esters, silicone surfactants, nonionic surfactants, and the like can be used in combination.

As said pigment, the general purpose pigment conventionally applied to oil-based ink is used suitably.
Specifically, inorganic pigments such as carbon black, ultramarine, titanium dioxide pigments, azo pigments, phthalocyanine pigments, indigo pigments, thioindigo pigments, selenium pigments, quinacridone pigments, anthraquinone pigments, selenium pigments, diketopyrrolo Organic pigments such as pyrrole pigments, dioxazine pigments, perylene pigments, perinone pigments, isoindolinone pigments, aluminum pigments, metal pigments whose surfaces are treated with colored resins, transparent or colored transparent films such as aluminum Metallic pigment, gold, silver, platinum, copper, with a thickness of 0.01 to 0.1 μm, obtained by peeling a metallic vapor deposited film such as aluminum formed on a substrate such as a metallic luster pigment, film, etc. Colloidal particles having an average particle size selected from 5 to 30 nm, fluorescent pigments, luminous pigments, thermochromic pigments Natural mica as a core material, synthetic mica, glass pieces, alumina, pearl pigment and the like to the surface of the transparent film pieces were coated with a metal oxide such as titanium oxide.
The pigment may be used alone or in combination of two or more, and is used in the range of 3 to 40% by weight in the ink composition.
In addition, general-purpose dyes such as organic solvent-soluble dyes classified as solvent dyes in the color index can be used in combination with the pigments.

The resin is used for imparting handwriting fixability to the writing surface and viscosity of the ink, and further works with the release agent to improve the scratch erasability of the handwriting.
Examples of the resin include cellulose resins such as ethyl cellulose and acetyl cellulose, vinyl resins such as polyvinyl butyral, polyvinyl pyrrolidone, polyvinyl acetate, and vinyl pyrrolidone-vinyl acetate copolymer resin.

As the organic solvent, a volatile (low boiling point) organic solvent is suitably used, and even when writing on a whiteboard, the handwriting has excellent drying properties. Therefore, when the handwriting immediately after writing is touched, undried ink is used. A good handwriting can be formed without causing problems such as adhering to the hand or contaminating a blank portion where the handwriting on the writing surface is not formed.
Examples of the organic solvent include a lower aliphatic alcohol solvent or a glycol ether solvent, and it is preferably used as a main solvent (occupying 50% by weight or more of the total solvent).
The lower aliphatic alcohol solvent is methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, and the glycol ether solvent is ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether. More preferably, the lower aliphatic alcohol solvent is an aliphatic alcohol having 2 to 4 carbon atoms, and the glycol ether solvent is a glycol ether having 3 to 5 carbon atoms.
In addition, other solvents can be used in combination with the organic solvent, hydrocarbon organic solvents such as n-heptane, n-octane, isooctane, methylcyclohexane, ethylcyclohexane, toluene, xylene, ethylbenzene, methyl isobutyl ketone, methyl Ketone organic solvents such as n-propyl ketone, methyl n-butyl ketone, di-n-propyl ketone, n-butyl formate, isobutyl formate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, ethyl propionate , Ester organic solvents such as n-butyl propionate, methyl butyrate, ethyl butyrate, methyl lactate, ethyl lactate, glycol solvents such as ethylene glycol, diethylene glycol, propylene glycol, benzyl glycol, benzyl alcohol, γ-butyro It can be exemplified a ton and the like.

Further, the ink composition of the present invention may contain various additives such as a handwriting whitening inhibitor, a drying resistance imparting agent, a rust inhibitor, a viscosity modifier, a pigment dispersant, and a surfactant in addition to the above components as necessary. Agents can be used.
The additive is a so-called conventional additive, and can be appropriately used as necessary from known compounds.

The ink composition is practically used by filling a marking pen with a pen tip attached to the writing tip.
The structure and shape of the marking pen itself are not particularly limited. For example, a marking pen pen tip such as a fiber tip, felt tip, plastic tip, etc. is attached to the writing tip, and from a fiber bundle accommodated inside the shaft tube The ink occlusion body is impregnated with ink, the ink is supplied to the tip of the writing, the ink is stored directly inside the shaft tube, and the ink flow rate adjustment member consisting of a comb groove-like ink flow rate adjustment member or fiber bundle is interposed And a marking pen having a structure in which a predetermined amount of ink is supplied to the writing tip, and a structure in which the ink is directly stored in the shaft cylinder and a predetermined amount of ink is supplied to the writing tip by a valve mechanism.
In addition to the cap-type marking pen provided with a cap that covers the pen tip, the marking pen has a knock-out type, a rotary type, a slide-type type intrusion mechanism, and the like that can accommodate the pen tip in the shaft cylinder. A marking pen of a formula may be used.

  The following table shows the composition of the oil-based marking pen ink composition for writing boards. In addition, the numerical value in a table | surface shows a weight part.

The contents of the raw materials are shown below along the note numbers in the table.
(1) C.I. I. Pigment Black 7 50%, polyvinyl butyral 50% processed pigment (2) C.I. I. Pigment Blue 60 45%, polyvinyl butyral 55% processed pigment (3) C.I. I. Pigment Red 58 55%, polyvinyl butyral 45% processed pigment (4) Mixture of ditetradecyl carbonate and dipentadecyl carbonate, manufactured by Nikko Chemicals Co., Ltd., trade name: LIALCARB SR-1000 / R
(5) Dihexadecyl carbonate (6) Trimethylolpropane triester of capric acid (7) Daiichi Kogyo Seiyaku Co., Ltd., trade name: Haitenol 12
(8) Made by Daiichi Kogyo Seiyaku Co., Ltd., trade name: Prisurf A-208S

Preparation of ink Put a solvent and a processed pigment in a stirring vessel, stir at 20 ° C. for 3 hours with a high-speed blade type mixer, add the remaining additive (release agent), and stir for another 1 hour. A composition was obtained.

Production of Marking Pen An oil-based marking pen was obtained by filling 5 g of each of the ink compositions of Examples and Comparative Examples into a commercially available marking pen (manufactured by Pilot Corporation; WBMARL).
The following tests were performed using the marking pen.

Erasability test Using each marking pen, write five consecutive circles on various writing boards (white boards), and place 100 g of weight on the handwriting immediately after writing and on the handwriting after 20 days at 20 ° C. The erasability when moved over the handwriting with tissue paper was visually observed.
As the writing board, a hollow plate having a surface gloss value of 70 ° gloss, a board surface coated with a melamine resin, a board surface coated with an acrylic resin, and a board surface coated with a polyester resin were used. .
The test results are shown in the following table.

The evaluation of symbols in the table is as follows.
Eraseability test ○: The handwriting can be erased by three movements.
Δ: A part of the handwriting remains after three movements.
X: More than half of the handwriting remains unerasable after three movements.

Claims (3)

An oil-based marking pen ink composition for a writing board comprising a pigment, a resin, an organic solvent, and a dialkyl carbonate represented by the following general formula (1).
R ₁ —O—CO—O—R ₂ (1)
(Here, R ₁ and R ₂ represent an alkyl group having 12 to 30 carbon atoms)   The oil-based marking pen ink composition for a writing board according to claim 1, wherein the dialkyl carbonate is added in an amount of 3 to 20% by weight based on the total amount of the ink composition.   The writing board according to claim 1 or 2, comprising one or more selected from sulfuric acid ester of polyoxyalkylene alkyl ether, sulfuric acid ester of polyoxyalkylene alkyl aryl ether, polyoxyethylene alkyl ether phosphate ester or a salt thereof. Oil-based marking pen ink composition.