JPH07207212A - Water-base marking pen ink for writing board - Google Patents

Abstract

PURPOSE:To obtain a water-base marking pen ink for a writing board which is easily erasable by rubbing with a dry eraser not only just after writing on a writing board but also long after the writing. CONSTITUTION:This ink comprises a colorant, a release agent, a polymer latex, and water provided the release agent is selected from the group consisting of an alkyl ester of a fatty acid, a dialkyl dicarboxylate, a polyglycerin ester of a fatty acid, a glycol ether ester of a fatty acid, a di(glycol ether ester) of a dicarboxylic acid, and an alkyl vinyl ether.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-based marking pen ink for a writing board in which the handwriting written on the writing board surface is erased by rubbing with a dry erasing material such as soft paper or cloth.

[0002]

2. Description of the Related Art Many marking pens for writing boards have been commercially available, but most of them use an ink containing a volatile organic solvent as a medium, so that they have a strong odor when used and There is a problem with safety. On the other hand, several inventions of an aqueous marking pen ink for a writing plate of an aqueous medium that does not generate an odor have been proposed in recent years (for example, JP-A-1-
No. 11174, No. 174577, No. 252681, etc.) are not satisfactory in terms of erasability of handwriting.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides an aqueous marking pen ink for a writing plate of an aqueous medium, which provides a handwriting having good erasability not only immediately after writing on the writing plate surface but also after a long time has passed. Is to provide.

[0004]

The water-based marking pen ink for writing plates of the present invention has a composition containing a colorant, a release agent, a polymer latex and water as essential components, and each component is composed of the substances listed below. To be elected. The release agent is used in the form of an emulsion of the following compound.

Examples of colorants include azo-based, anthraquinone-based, condensed polyazo-based, thioindigo-based, metal complex salt-based, phthalocyanine-based, perinone-based, perylene-based, dioxazine-based and quinacridone-based organic pigments, carbon black, iron oxide, etc. Inorganic pigments and fluorescent pigments are used in the ink composition in an amount of 0.5 to 20% by weight, preferably 1 to 10% by weight.

As the polymer latex, carboxylated styrene-butadiene copolymer latex, carboxylated acrylonitrile-butadiene copolymer latex, styrene-butadiene copolymer latex, acrylonitrile-butadiene copolymer latex, carboxylated methacrylic acid ester- Butadiene copolymer latex, chloroprene latex, isobutylene-isoprene copolymer latex, acrylic latex, vinyl chloride latex, vinylidene chloride latex,
Natural rubber-based latex, silicone-based latex, fluororesin-based latex, ethylene-propylene copolymer latex, polysulfide resin-based latex and the like are used, and in the ink composition, 0.1 to 30% by weight in terms of solid content, preferably It is used in the range of 1 to 15% by weight.

As a stripping agent, a fatty acid alkyl ester,
It is an emulsion of one or more compounds selected from dicarboxylic acid dialkyl ester, polyglycerin fatty acid ester, fatty acid glycol ether ester, dicarboxylic acid di (glycol ether ester), and alkyl vinyl ether. The emulsified product can be obtained by emulsifying the compound in water by a means such as a homogenizer or a colloid mill using a surfactant. As the surfactant used for emulsification, polyoxyethylene alkyl ether, polyoxyethylene aryl ether, polyoxyethylene fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester,
The nonionic surfactant and the anionic surfactant such as polyoxyethylene alkylaryl ether phosphate are used in a weight ratio of 0.1 to 1 with respect to the compound. The release agent is used so that the compound contained in the ink composition has a content in the range of 1 to 20% by weight, preferably 3 to 10% by weight.

In order to improve the wettability of the ink on the writing plate surface, a fluorine-based surfactant or a silicone-based surfactant is used in the ink composition in an amount of 0.01 to 3% by weight, if necessary. Good. If necessary, a small amount of a lower fatty alcohol such as ethanol or propanol may be added to accelerate the drying of the handwriting, but at least 5% of water is the solvent.
It accounts for 0% by weight or more.

[0009]

[Function] The release agent compound in the ink forms a film that does not firmly adhere to the plate surface by interacting with the polymer of the polymer latex as the solvent evaporates in the handwriting written on the writing plate surface, Brings handwriting that is easily erased by light rubbing with an eraser.

[0010]

【Example】

1. Preparation of Release Agent (Emulsion) A mixture of each component having the composition shown in Table 1 was stirred and emulsified with a homogenizer to obtain release agents AF.

[Table 1]

2. Preparation of sample inks Table 2 shows the compositions of the example inks and the comparative example inks. Mix a predetermined amount of pigment dispersion, polymer latex and water,
The mixture is placed on a disperser and stirred for 1 hour, and then components such as a release agent, a surfactant and an alcohol are added,
The sample ink was obtained by further stirring for 1 hour. The ink of Comparative Example 1 is an example in which the release agent is removed from the ink of Example 1, and the ink of Comparative Example 2 is an example in which the polymer latex in the ink composition of Example 1 is replaced with a water-soluble acrylic resin (JP-A-1). -25
(Corresponding to the ink composition described in Japanese Patent No. 2681).

[0012]

[Table 2]

The raw materials listed in Tables 1 and 2 will be described according to the note numbers in the tables. (1) Octyl stearate (2) Dioctyl dodecanedioate (3) Diglyceryl dioleate (4) Hexadecyl vinyl ether (5) Stearic acid ethylene glycol 2-ethylhexyl ether ester (6) Sebacic acid ethylene glycol butyl ether diester (7) ) Polyoxyethylene sorbitan monooleate (HLB15.0) (8) Polyoxyethylene alkylaryl ether phosphate ester (HLB9.6) (9) Polyoxyethylene oleyl ether (HLB1)
2.0) (10) Aqueous pigment dispersion containing 20% by weight of carbon black, 8% by weight of nonionic surfactant, 2% by weight of anionic surfactant (11) 15% by weight of perinone orange, nonionic surfactant Aqueous pigment dispersion containing 6% by weight of an agent (12) 20% by weight of monoazo red and 8% by weight of a nonionic surfactant (13) Carboxylated styrene-butadiene copolymer latex (47% solid content) (14) Carboxylated acrylonitrile-butadiene copolymer latex (solid content 43%) (15) Vinyl chloride latex (solid content 55%) (Nippon Zeon Co., Ltd., trade name G-576) (16) Water-soluble acrylic 30.5% aqueous solution of resin (John Cryl 61J, a product of Johnson Polymer Co., Ltd.) (17) Fluorine-based surfactant (Asahi Glass Co., Ltd., product name Surflon S-1) 41)

3. Sample ink performance (handwriting erasability) test A marking pen was filled with a predetermined amount of each sample ink to prepare a sample pen. A predetermined line was drawn with each sample pen on a writing plate (painted plate) surface-coated with a thermosetting acrylic silicone resin and a writing plate on the surface of an enamel plate, and the erasability immediately after and after a lapse of time (2 weeks) was examined. . Use a dry cloth to erase 100
The number of times of rubbing required to completely erase the handwriting was measured by rubbing with a gw load. The test results are shown in Table 3.

[0015]

[Table 3] The contents of the evaluation symbols in Table 3 are as follows. Evaluation criteria ◯: Erased by rubbing 1 to 5 times Δ: Erasable by rubbing 6 to 10 times ×: Not erased by rubbing 10 times

[0016]

EFFECT OF THE INVENTION Since the water-based marking pen ink for writing plates of the present invention is water-based, it is natural that no odor is generated during use, but of course immediately after writing on the writing plate surface, Even after a long period of time, the handwriting is easily erased by rubbing with a dry erasing material.

Claims (1)

[Claims] 1. An ink composition containing a colorant, a release agent, a polymer latex and water as essential components, wherein the release agent is a fatty acid alkyl ester, dicarboxylic acid dialkyl ester, polyglycerin fatty acid ester, fatty acid glycol ether ester, A water-based marking pen ink for writing boards, which is an emulsion of a compound selected from dicarboxylic acid di (glycol ether ester) and alkyl vinyl ether.