JP3512564B2 - Water-based erasable marking pen ink composition - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous erasable marking pen ink composition, and particularly to a writing surface which is water-based and non-absorbent or non-penetrative, typically a so-called white board. In a marking pen ink composition having excellent erasability of written handwriting, a so-called releasing agent which stabilizes an emulsion of an oily substance which is hardly volatile at room temperature, and thus has an erasability over a long period of time. The present invention relates to a marking pen ink composition which is stably held, and in which the handwriting on a white plate is quickly dried and the handwriting is not stained on the white plate.

[0002]

2. Description of the Related Art Conventionally, a handwriting written on a non-absorbing or non-penetrating writing surface is lightly rubbed with an eraser (white board wiping) made of a soft cloth to wipe the handwriting from the writing surface to erase the handwriting. Various water-based erasable marking pen ink compositions thus prepared are known. Such a conventional water-based erasable marking pen ink composition generally contains water as a solvent, a colorant, a film-forming resin, and an additive called a release agent.
As described in JP-A-252681, an oily substance which is hardly volatile at room temperature, such as an aliphatic carboxylic acid ester, is blended in an ink composition as an emulsion,
Used as a release agent.

As described above, the conventional water-based erasable marking pen ink composition is not always stable because the release agent exists in the ink composition as an O / W type emulsion, that is, as fine particles. , Aggregate,
It may separate, and thus has a problem of poor storage stability over a long period of time. When the release agent aggregates and separates in the ink composition as described above, it becomes difficult to erase the handwriting, and of course the writing itself becomes difficult.

[0004]

DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted extensive studies to solve the above-mentioned problems in conventional water-based erasable marking pen ink compositions, and as a result, the release agent as an emulsion in the ink composition has been found. Along with this, when cyclodextrin or a derivative thereof as the emulsion stabilizer and a partially saponified water-soluble polyvinyl alcohol resin having a predetermined saponification degree and a polymerization degree are blended as a resin component, the cyclodextrin or the derivative thereof is blended. And the partially saponified polyvinyl alcohol resin, the stability of the ink composition containing the above emulsion can be remarkably enhanced, and thus the storage stability of the water-based erasable marking pen ink composition can be enhanced and extended. Can maintain excellent erasability even after being left for a long time. Can, furthermore, handwriting on the white plate is quickly dried, also found that it is possible to suppress the handwriting stains on the white plate, and have reached the present invention.

Therefore, the present invention provides an aqueous erasable marking pen ink composition containing an emulsion of an oily substance which is hardly volatile at room temperature as a release agent, and enhances the storage stability of the ink composition containing the emulsion, In addition, it is possible to secure excellent erasability even after leaving it for a long time, and the handwriting on the white plate dries quickly,
Another object of the present invention is to provide an aqueous erasable marking pen ink composition in which handwriting stains on a white plate are reduced.

[0006]

The water-based erasable marking pen ink composition according to the present invention comprises (a) water as a solvent,
(b) a colorant, (c) an emulsion of an oily substance that is hardly volatile at room temperature, (d) cyclodextrin or a derivative thereof, and
(e) A partially saponified water-soluble polyvinyl alcohol resin having a saponification degree of 50 to 85% and a polymerization degree of 1500 or less is contained.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a marking pen is, firstly, a writing tool also called a felt pen, and is made of felt, a fiber bundle, a pen tip made of a plastic molding or the like at the tip of a tubular body. In addition to the above, the main body is provided with an ink storage means in which felt, fiber bundles, etc. are impregnated with ink, and ink is supplied from such an ink storage means to the pen tip by utilizing the capillary phenomenon to enable writing. A writing instrument, a so-called core-type marking pen, which is used as a second type, and secondly, the ink is directly stored in the tubular body as it is,
It refers to a non-core type or so-called free ink type marking pen adapted to supply this ink to the pen tip, and the water-based erasable marking pen ink composition according to the present invention is suitably used for any of such writing instruments. be able to. In the marking pen ink composition according to the present invention, water is used as the solvent. The amount of water in the ink composition is usually 50 to 90% by weight, preferably 60 to 80%.
It is in the range of% by weight.

In the aqueous erasable marking pen ink composition according to the present invention, a pigment is preferably used as the colorant. As the pigment, carbon black, phthalocyanine series such as copper phthalocyanine blue, slene series, azo series, quinacridone series, anthraquinone series, dioxane series, indigo series, thioindigo series, perinone series,
Perylene type, indolenone type, azo-azomethine type, etc.
Any one can be used. Further, a fluorescent pigment is also used. A dispersion prepared by dispersing various pigments in water has already been marketed, and such a commercially available product can be preferably used also in the present invention. Since various resin dispersants, surfactants and the like may be blended in the pigment dispersion as a dispersant for the pigment, such resins, surfactants and the like may also be used in the ink composition of the present invention. It may be contained. The pigment dispersant is known per se, and is usually used in an amount of 0.05 to 20 parts by weight, preferably 0.1 to 5 parts by weight, based on 1 part by weight of the pigment.

Further, in the present invention, as the colorant,
Resin particles known as plastic pigments are also used. Plastic pigments are polystyrene, acrylic-, obtained by emulsion (co) polymerization
It is an emulsion of hollow styrene resin particles such as poly (methyl methacrylate), polyvinyl chloride resin, etc., having a particle size of about 0.3 to 1.0 μm. Further, in the present invention, such a plastic pigment colored with a pigment or a dye can also be suitably used as the colorant.

The colorant is contained in the ink composition according to the present invention in an amount of usually 0.1 to 30% by weight, preferably 1 to 20% by weight. When the colorant is contained in an excessive amount, the viscosity of the ink composition is too high, resulting in inferior writability and reduced erasability. On the other hand, if the colorant content is too low,
The handwriting density is too low to be practical.

In the water-based erasable marking pen ink composition according to the present invention, a liquid substance which is hardly volatile at room temperature is mixed in the ink composition as a release agent for handwriting in the form of emulsion. As such a liquid substance which is hardly volatile at room temperature, conventionally, as long as it is compounded as an emulsion of a liquid substance which is hardly volatile at room temperature in an aqueous erasable ink composition, it is particularly preferable. Any of them can be used without limitation. Particularly, in the present invention, as the liquid substance which is hardly volatile at room temperature, as described in the above-mentioned JP-A-1-252681, an oily aliphatic carboxylic acid ester which is hardly volatile at room temperature, a higher grade Hydrocarbons or higher alcohols are preferably used.

As the above-mentioned aliphatic carboxylic acid ester,
As the ester, a monobasic acid ester, a dibasic acid diester, a mono- or diester of a dihydric alcohol, or a mono-, di- or triester of a trihydric alcohol is preferably used. Particularly preferred specific examples include monobasic acid esters, particularly propyl myristate, which is a higher fatty acid ester, butyl palmitate, butyl stearate, and the like.
Aliphatic dibasic acid dialkyl esters such as dioctyl dodecanedioate, dipropyl adipate, dioctyl sebacate, dioctyl azelate, etc., dihydric alcohol esters such as propylene glycol monostearate, decanoic acid diester of propylene glycol, trihydric alcohol triester. Examples thereof include esters of natural or synthetic fatty acid triglycerides and trimethylolpropane triisostearate. These are used alone or as a mixture of two or more kinds.

As the higher hydrocarbon as a stripping agent, what is usually called liquid paraffin or squalane is preferably used, but even if it is partially oxidized, for example, oxidized polyethylene wax. Good. The higher alcohol that is liquid at room temperature is not particularly limited, but for example, hexyl alcohol, octyl alcohol, lauryl alcohol, etc. are preferably used.

Aqueous emulsions of such aliphatic carboxylic acid esters, higher hydrocarbons or higher alcohols are
It can be prepared by a usual emulsification method. Also,
Commercial products can also be used. Furthermore, if necessary, two or more aqueous emulsions of an aliphatic carboxylic acid ester, a higher hydrocarbon or a higher alcohol may be added to the ink composition.

In the ink composition according to the present invention, an oily substance which is hardly volatile at room temperature as a release agent is usually contained in the range of 1 to 50% by weight, preferably 2 to 50% by weight. It is contained in the range of 20% by weight. In the ink composition, when the amount of such a releasing agent is less than 1% by weight, sufficient handwriting erasability cannot be obtained, while 5
Even if the content is too much over 0% by weight, the handwriting will be elongated and the writing surface will be soiled, and on the contrary, the erasability of the handwriting will be deteriorated.

In the water-based erasable marking pen ink composition according to the present invention, cyclodextrin or a derivative thereof (hereinafter collectively referred to as cyclodextrin) may be contained as a stabilizer for the emulsion. . Cyclodextrin has a D of 6 to 10
-A sugar oligomer in which glucopyranose groups are cyclically linked by an α- (1,4) glucosidic bond, and α-, β- and γ-cyclodextrin having a polymerization degree of 6, 7 and 8 are preferable. Are known.

In the present invention, such α-, β
-, Γ- or δ-cyclodextrin, as well as various methyl derivatives thereof, for example, 2,6-dimethyl-β-cyclodextrin, 2,3,6-trimethyl-β-cyclodextrin, partially methylated β- Cyclodextrin,
Maltosyl cyclodextrin, glycosyl cyclodextrin and the like are also effectively used. All of these cyclodextrins are water soluble to varying degrees.

These cyclodextrins are used in the ink composition according to the present invention in the range of 0.1 to 20% by weight. When the amount of the cyclodextrin compounded in the ink composition is less than 0.1% by weight, the effect of stabilizing the emulsion is poor. On the other hand, when the amount of cyclodextrin is more than 20% by weight, the resulting ink can be obtained. In addition to the composition being thickened and inferior in writability, the adhesive force of the handwriting on the writing surface becomes excessively strong, resulting in inferior erasability.
According to the present invention, the amount of cyclodextrin added to the ink composition is preferably in the range of 0.5 to 10% by weight, and most preferably in the range of 1 to 5% by weight.

Further, the ink composition according to the present invention has a coating or layer on the non-absorption surface, which has a coating or a layer made of a resin containing the above-mentioned coloring agent, after the water has been vaporized, and the handwriting. So that the layer can be separated from the layer of release agent described above,
As a resin component having film-forming properties at room temperature, a saponification degree of 50-
It contains a partially saponified water-soluble polyvinyl alcohol resin having a polymerization degree of 1,500 or less at 85%. This resin not only forms the main body of handwriting, but also separates from the above-mentioned release agent layer and contributes to the erasability of handwriting.

In particular, according to the present invention, by incorporating such a partially saponified polyvinyl alcohol resin into the ink composition as a resin component, various particles in the ink composition, that is, emulsion particles and pigment particles, can be obtained. The cyclodextrin is stabilized, and further, the partially saponified polyvinyl alcohol forms a protective colloid of the cyclodextrin, prevents the emulsion particles and pigment particles from approaching each other, prevents aggregation, and facilitates their coexistence. The composition can be made more stable. In addition, the partially saponified polyvinyl alcohol resin is useful for quickly drying the handwriting on the white plate and also for suppressing the handwriting stain on the white plate.

According to the present invention, such a partially saponified polyvinyl alcohol resin can be used in an ink composition of 0.
It is contained in the range of 1 to 15% by weight, preferably 0.3 to 10% by weight. When the resin is contained in an excessive amount, the viscosity of the ink composition is too high, resulting in inferior writability,
The erasability is also reduced. On the other hand, when the content of the resin is too small, the handwriting is extended, the writing surface is soiled, and the erasability of the handwriting is poor.

The partially saponified polyvinyl alcohol resin is
The lower the degree of saponification, the smaller the amount of hydrophilic hydroxyl groups in the resin. Therefore, the resulting ink composition is easy to dry and the spread of handwriting is less, but the degree of saponification is less than 50%. If it is too small, the solubility in water is insufficient and it is not suitable for use in the present invention. However, the completely saponified polyvinyl alcohol resin has high hygroscopicity, and thus the obtained ink composition is slow to dry and the handwriting is extended, and further, the resin has high crystallinity, and even if the handwriting is dried, it is difficult to form a film. Therefore, the white plate is liable to be soiled when the handwriting is erased, and is not suitable for use in the present invention.
Therefore, in the present invention, it is essential to use a partially saponified polyvinyl alcohol resin having a saponification degree of 50 to 85%.

Further, a partially saponified polyvinyl alcohol resin having a degree of polymerization of more than 1500 excessively raises the viscosity of the obtained ink composition and deteriorates the writability thereof, while a resin having an excessively low degree of polymerization is a resin film. Is not formed or the film-forming property is poor, so that the writability is similarly poor. According to the invention, the partially saponified polyvinyl alcohol used is
The degree of polymerization is preferably 100 or more.

In the present invention, other room temperature film-forming resins may be used together with the partially saponified polyvinyl alcohol resin. As such a resin, (1) polyvinyl acetate, vinyl acetate copolymer, emulsion or hydrosol of alkyd resin or urethane resin, (2) water-solubilized vinyl acetate copolymer, alkyd resin or urethane resin, or (3) A water-soluble resin other than the partially saponified polyvinyl alcohol, or (4) any combination thereof can be exemplified.

As the comonomer in the above emulsion or hydrosol or the water-solubilized vinyl acetate copolymer, vinyl ester compounds other than vinyl acetate, such as vinyl propionate and vinyl versatate, unsaturated carboxylic acids such as vinyl acetate can be used. , Acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, crotonic acid, citraconic acid, etc., or vinyl hydrocarbons such as ethylene, propylene, styrene, α-methylstyrene, etc. . These may be mixed and used as a comonomer. Furthermore, in addition to the above, esters of the above unsaturated carboxylic acids such as methyl acrylate, ethyl acrylate, methyl methacrylate, dimethyl maleate and the like can be used as a comonomer. Also,
The vinyl acetate copolymer may be a graft copolymer to polyvinyl acetate.

As a specific example of a particularly preferable vinyl acetate copolymer, for example, a vinyl acetate-acrylic acid copolymer,
Vinyl acetate-methacrylic acid copolymer, vinyl acetate-styrene-acrylic acid copolymer, vinyl acetate-styrene-maleic anhydride copolymer, vinyl acetate-acrylic acid-methyl acrylate copolymer, vinyl acetate-methacrylic acid -Methyl acrylate copolymer, vinyl acetate-acrylic acid-ethyl acrylate copolymer, vinyl acetate-methacrylic acid-
Examples thereof include a methyl methacrylate copolymer and a vinyl acetate-maleic anhydride copolymer. Polyvinyl acetate and emulsions and hydrosols of the above vinyl acetate copolymers can be easily obtained as commercial products.

The water-solubilized vinyl acetate copolymer is a water-solubilized vinyl acetate copolymer as described above which is salted with an inorganic or organic base.
Examples thereof include alkali metal salts such as sodium and potassium, organic salts such as ammonium salts and organic amine salts. Such a water-solubilized vinyl acetate copolymer can also be obtained as a commercial product.

Similarly, the water-solubilized alkyd resin is
An alkyd resin having a free carboxyl group obtained from an excess amount of a polybasic acid and a polyhydric alcohol is neutralized and salted with an alkali metal base, an ammonium base, an organic amine, or the like, which is solubilized in water. These can also be obtained as commercial products. In addition, water-solubilized urethane resin also has, for example, a carboxyl group in the polymer main chain, and the carboxyl group is neutralized with an alkali metal base, an ammonium base, an organic amine or the like to form a water-solubilized urethane resin. These are also available as commercial products. Furthermore, emulsions and hydrosols of alkyd resins and urethane resins can be obtained as commercial products.

Examples of the water-soluble resin include synthetic resins such as polyvinyl acetal resin and polyvinyl pyrrolidone resin, and natural water-soluble resins such as gum arabic and shellac. Such a room temperature film-forming resin is 0.1 in the total amount (solid content) with the partially saponified polyvinyl alcohol resin in the ink composition according to the present invention.
It is used in the range of -15 wt%, preferably 0.3-10 wt%. When the resin is contained in an excessive amount, the viscosity of the ink composition is too high, so that the writability is poor and the erasability is also reduced. On the other hand, when the content of the resin is too small, the handwriting is extended, the writing surface is soiled, and the erasability of the handwriting is poor.

Further, in the ink composition according to the present invention, a water-soluble polyhydric alcohol may be added as a release aid in order to enhance the effect of the release agent. Examples of such polyhydric alcohols include ethylene glycol, diethylene glycol, triethylene glycol,
Examples thereof include propylene glycol, dipropylene glycol, tripropylene glycol, polyethylene glycol having a molecular weight of about 200 to 600, polypropylene glycol having a molecular weight of 1000 to 3000, glycerin, trimethylolpropane and the like. Such a polyhydric alcohol is blended in the ink composition in an amount of 20% by weight or less, preferably 10% by weight or less. When it is excessively mixed in the ink composition in an amount exceeding 20% by weight,
It is not preferable because the viscosity of the ink composition is excessively increased and the writing property is deteriorated.

The ink composition according to the present invention may contain various surfactants as another peeling aid, if necessary. As such a surfactant, an anion,
Any of a cation, a nonion and an amphoteric can be used, and an anion, a nonion or a fluorosurfactant is particularly preferably used. As the anionic surfactant, for example, sulfo fatty acid ester salt such as dioctyl sodium sulfosuccinate, higher alcohol sulfate ester salt, polyoxyethylene alkylphenyl ether sulfate ester salt, alkylaryl sulfonate, olefin sulfonate, etc. Can be mentioned. Also,
Examples of nonionic surfactants include polyoxyethylene ethers such as polyoxyethylene alkyl ether and polyoxyethylene alkylphenyl ether, polyhydric alcohol fatty acid esters, and polyoxyethylene ethers of polyhydric alcohol fatty acid esters. You can

The ink composition according to the present invention, as a drying accelerator for improving the dryness of handwriting, is usually 15% by weight or less based on the ink composition, preferably to the extent that the emulsion contained in the ink composition is not destroyed. Is 1
The lower aliphatic alcohol may be contained in the range of 10% by weight. In particular, ethanol, propanol or butanol is preferably used.

In addition to the above, the ink composition may optionally contain any pH adjusting agent, preservative, preservative and the like which are usually blended with the aqueous ink composition.
The handwriting with the ink composition according to the present invention on the non-absorbent or non-permeable writing surface is formed into a film while the resin contains a colorant when water is evaporated, that is, when the handwriting is dried. On the other hand, the emulsion of the aliphatic carboxylic acid ester as the release agent, the higher hydrocarbon, the higher alcohol, etc., which is difficult to volatilize at room temperature, is destroyed, and the above-mentioned oily layer and the above non-absorptive writing surface are formed. Since it is formed so as to be interposed between the resin film and the resin film, the handwriting has erasability.

The surfactant as a peeling aid has an effect of assisting the separation of the oily layer and the resin film containing the pigment in handwriting during writing. However, the surfactant also enhances the leveling property during writing, eliminates uneven distribution of the release agent emulsion in the handwriting before drying on the writing surface, and imparts uniform erasability after the handwriting is dried. Have. In particular, these effects are remarkable when a fluorine-based surfactant is used.

[0035]

As described above, the water-based erasable marking pen ink composition according to the present invention contains water as a solvent, a resin having a film-forming property at room temperature and a release agent which is hardly volatile at room temperature. The oily substance is dispersed and mixed as an aqueous emulsion, and cyclodextrin is mixed as a stabilizer of this emulsion, and further, as a resin component,
It is prepared by blending a partially saponified water-soluble polyvinyl alcohol resin having a saponification degree of 50 to 85% and a polymerization degree of 1500 or less.

Therefore, according to the ink composition of the present invention, after the handwriting is dried, an oil layer having a continuous release agent is formed on the writing surface, and the resin film containing the colorant is separated from the writing surface. By lightly rubbing with an eraser (white plate wipe), only the rubbed portion can be easily peeled and erased, and moreover, the cyclodextrin and the partially saponified polyvinyl alcohol resin work together to produce a release agent. Since it stabilizes not only the emulsion particles but also the pigment particles and the resin particles, it has a high storage stability and, in addition, retains excellent erasability even after being left for a long period of time. Furthermore, since the ink composition according to the present invention contains a partially saponified polyvinyl alcohol resin having a predetermined saponification degree as a resin component, the handwriting on the white plate dries quickly, and when the handwriting is erased, the handwriting on the white plate is removed. There is little stain on the handwriting.

[0037]

The present invention will be described below with reference to examples.
The present invention is not limited to these examples. In the following examples and comparative examples, the component amounts are% by weight.
, And the balance is water.

Example 1   Colorant carbon black 2   Dispersant Ammonium salt of styrene-acrylic acid copolymer 1   Resin Polyvinyl alcohol resin (saponification degree 80%, degree of polymerization                 300) 2   Stripping agent butyl myristate 8   Cyclodextrins                 α-cyclodextrin 1   Surfactant Sodium dioctyl sulfosuccinate 0.5                 Polyoxyethylene oleyl ether 0.5   Antiseptic and antifungal agent (effective amount)

Example 2   Colorant Phthalocyanine Green 3   Dispersant Vinyl acetate-acrylic acid copolymer emulsion (solid                   As minutes) 2   Resin Polyvinyl alcohol resin (Saponification degree 70%, degree of polymerization                 200) 3   Release agent Butyl stearate 10   Cyclodextrins                 Maltosyl cyclodextrin 5   Surfactant Polyoxyethylene lauryl ether 1                 Fluorosurfactant 0.1   Antiseptic and antifungal agent (effective amount)

Comparative Example 1   Colorant carbon black 2   Dispersant Ammonium salt of styrene-acrylic acid copolymer 1   Resin Polyvinyl alcohol resin (complete saponification, degree of polymerization 30                 0) 2   Stripping agent butyl myristate 8   Cyclodextrins                 α-cyclodextrin 1   Surfactant Sodium dioctyl sulfosuccinate 0.5                 Polyoxyethylene oleyl ether 0.5   Antiseptic and antifungal agent (effective amount)

Comparative Example 2   Colorant Phthalocyanine Green 3   Dispersant Vinyl acetate-acrylic acid copolymer emulsion (solid                   As minutes) 2   Resin Polyvinyl alcohol resin (saponification degree 88%, degree of polymerization                 200) 3   Release agent Butyl stearate 10   Cyclodextrins                 Maltosyl cyclodextrin 5   Surfactant Polyoxyethylene lauryl ether 1                 Fluorosurfactant 0.1   Antiseptic and antifungal agent (effective amount)

Comparative Example 3 Colorant Carbon black 2 Dispersant Styrene-acrylic acid copolymer ammonium salt 1 Resin Polyvinyl alcohol resin (saponification degree 80%, degree of polymerization 1800) 2 Release agent Butyl myristate 8 Cyclodextrins α- Cyclodextrin 1 Surfactant Sodium dioctyl sulfosuccinate 0.5 Antiseptic and antifungal agent (effective amount) The above ink compositions were examined for storage stability, writability, handwriting dryness and erasability. The storage stability was evaluated by visually observing the ink composition after allowing it to stand in a constant temperature bath at 50 ° C. for 14 days. When it was uniform, it was Δ, when partial separation of the release agent was observed, and peeling was observed. When complete separation of the drug is observed ×
Indicate.

Writability is ◯ when the ink composition is filled in a felt pen and writing on a white board, when the writing is smooth, Δ when the ink composition feels a little difficult to come out, and when the handwriting is almost faint. Is indicated by x. The drying property was determined by writing on an enamel plate under the conditions of a temperature of 20 ° C. and a relative humidity of 65%, and after 30 seconds, the extension of the handwriting (dirt on the enamel plate) when wiped with an eraser. When there is no stain, it is indicated by ◯, when it is slightly stained, it is indicated by Δ, and when it is marked, it is indicated by ×.

The erasability was written on an enamel plate under the conditions of a temperature of 20 ° C. and a relative humidity of 65%, and was rubbed with an eraser with a load of 50 g. The time is indicated by Δ, and the time when it could not be erased is indicated by x. The results are shown in Table 1.

[0045]

[Table 1]

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-9-100433 (JP, A) JP-A-10-25442 (JP, A) JP-A-1-252681 (JP, A) JP-A-7- 90215 (JP, A) JP-A-6-264019 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C09D 11 / 00-11 / 20

Claims (4)

(57) [Claims] 1. A water as a solvent, (b) a colorant, (c) an emulsion of an oily substance which is hardly volatile at room temperature, (d) cyclodextrin or a derivative thereof, and (e) a degree of saponification of 50. A water-erasable marking pen ink composition containing a partially saponified water-soluble polyvinyl alcohol resin having a polymerization degree of 1,500 to 85%. 2. The aqueous erasable marking pen ink composition according to claim 1, wherein the oily substance which is hardly volatile at room temperature is at least one selected from aliphatic carboxylic acid esters, higher hydrocarbons and higher alcohols. 3. Cyclodextrin or a derivative thereof in 0.1
The water-based erasable marking pen ink composition according to claim 1, wherein the water-based erasable marking pen ink composition is contained in the range of 20 wt%. 4. The water-based erasable marking pen ink composition according to claim 1, which contains a surfactant in an amount of 10% by weight or less.