JPS61223071A - Ink erasing liquid - Google Patents

Abstract

PURPOSE:To provide an ink erasing liquid composed of an organic solvent, a plurality of specific peeling assistants having lower vapor pressure than said organic solvent, and a specific resin, and capable of erasing the mark written on a nonabsorbing surface surely and easily without exerting influence on the surrounding written marks. CONSTITUTION:The objective ink erasing liquid can be produced by compounding (A) an organic solvent (e.g. ethanol), (B) plural kinds of peeling assistants having lower vapor pressure than the component A and selected from the group of (i) a higher fatty acid ester (preferably isopropy myristate, etc.), (ii) a higher aliphatic hydrocarbon (preferably paraffinic hydrocarbon liquid at normal temperature) and (iii) a polyoxyethylene alkyl ether-type and polyoxyethylene alkylphenol ether-type nonionic surfactant (derivative) and (C) a resin soluble in the component A and insoluble or hardly soluble in the component B (e.g. polyvinyl butyral). The weight ratios of the component A:i: ii:iii:C are preferably (75-85):(2-8):(5-9):(3-8):(5-10).

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is applicable to glass, metal, ceramics, resin plates, and films for overhead projectors (hereinafter referred to as "films").

Easily removes handwriting and painted marks (hereinafter simply referred to as handwriting) on non-absorbing surfaces such as OHP films.
The present invention also relates to an ink eraser that can be erased reliably.

(Prior Art) Conventionally, as a method of erasing handwriting written on a non-absorbing surface, a cloth or the like is soaked in an organic solvent such as alcohol, acetone, or Kijirol to erase it.

Erasing is carried out using erasing markers filled with these organic solvents, erasers containing organic solvents, and the like.

(Problem to be solved by the invention) However, when an organic solvent is used, the handwriting dissolves and the handwriting becomes
There is a problem that the handwriting spreads around the handwriting, or that adjacent handwriting that does not need to be erased is also erased. Furthermore, when an eraser is used, there is a problem in that it damages the non-absorbing surface and requires a considerable amount of rubbing to completely erase it.

(Means for Solving the Problems) Therefore, the present inventors have conducted extensive research in order to solve the above problems and obtain an ink eraser that can easily and reliably erase handwriting written on non-absorbent surfaces. As a result, it dissolves handwriting and forms a film.

From the viewpoint that the above-mentioned problem could be solved if the handwriting components could be removed while still retaining them, the present invention was finally completed after various studies on the composition of the erasing liquid.

That is, 9 the present invention relates to organic solvents; higher fatty acid esters, higher aliphatic hydrocarbons, polyoxyethylene alkyl ether type nonionic surfactants and their derivatives, polyoxyethylene alkylphenol ether type nonionic surfactants and their A plurality of stripping aids selected from a group of stripping aids that are included in a group of compounds consisting of derivatives and have a higher vapor pressure than the organic solvent; and any of the plurality of stripping aids that is soluble in the organic solvent. The gist of the invention is an ink eraser consisting of at least a resin that is insoluble or poorly soluble in ink.

(Function) Since the ink eraser of the present invention is composed of an organic solvent, the resin, and the plurality of peeling aids described above, when it is applied onto handwritten marks, the organic solvent first dissolves the binder in the handwritten marks. , the handwriting components are absorbed into the eraser. Next, when the organic solvent evaporates, the resin forms a film, and the handwritten components are incorporated into the film, making it thicker. The plurality of peeling aids described above act synergistically on this film.

It imparts plasticity and wettability to the film, making the entire film brittle and easily peeling off due to abrasion, and since it forms a film, it does not spread around the handwriting, making it impossible to accidentally erase adjacent handwriting. It seems that this can be prevented as much as possible.

(Structure of the invention) Each component of the present invention will be explained in detail below.

Organic solvents include ethanol and pro/kunor.

Lower alcohols such as impropatol and butanol, lower aliphatic ketones such as methyl ethyl ketone and methyl isobutyl ketone, lower alcohol esters of lower fatty acids such as ethyl acetate and butyl acetate, and aromatic hydrocarbons such as benzene, toluene and xylene. , alicyclic alcohols, glycol alkyl ethers, etc., and these can be used alone or in combination,
The amount used is 65 to 95% by weight, preferably 75 to 85% by weight based on the total amount of eraser.

A synergistic effect can be achieved by using a plurality of peeling aids selected from the following group of peeling aids.

The peeling aid group includes those having a higher vapor pressure than the above-mentioned organic solvents, and higher fatty acid esters.

A group of compounds consisting of higher aliphatic hydrocarbons, polyoxyethylene alkyl ether type nonionic surfactants and their conductors, polyoxyethylene alkylphenol ether type nonionic surfactants and their derivatives, and specifically, The higher fatty acid ester is preferably an ester of a higher fatty acid having 6 or more carbon atoms and an aliphatic alcohol having 2 or more carbon atoms, such as isopropyl myristate, octyl palmitate, isooctyl stearate, isobutyl stearate, and isobutyl oleate. etc., and the amount used is 1 to 10% by weight based on the total amount of eraser,
Preferably it is 2 to 8% by weight.

The higher aliphatic hydrocarbons are preferably paraffinic hydrocarbons or olefinic hydrocarbons that are liquid at room temperature, such as liquid paraffin hydrocarbons of 124° and 168°. 208. Same 3
0 (manufactured by Mitsubishi Kasei Kogyo), etc.
The amount used is 1 to 10% by weight, preferably 5 to 9% by weight, based on the total amount of the eraser.

Examples of polyoxyethylene alkyl ether type nonionic surfactants and their derivatives, and polyoxyethylene alkylphenol ether type nonionic surfactants and their derivatives include polyoxyethylene lauryl ether,
There are polyoxyethylene cetyl ether, polyoxyethylene oleyl ether, polyoxyethylene stearyl ether, polyoxyethylene nonylphenyl ether, etc. Specifically, Emulgen 105 (manufactured by Kao Atlas ■), Niracol Be-2, and BO- 2 (manufactured by Nikko Chemicals ■), Emuldan 404. 408 (and above).

(manufactured by Kao Atlas ■), Niracol B5-2 (manufactured by A Hikari Chemicals ■), Neugen EA-50. EA-70 (manufactured by Daiichi Kogyo Seiyaku ■), etc., and the amount used is 1 to 10% by weight, preferably 3 to 8% by weight, based on the total amount of the eraser.

The resin gives the ink eraser the ability to form a film.

It is used for the purpose of imparting adhesion to the surface to be coated and imparting viscosity to the ink eraser, and is soluble in the organic solvent,
Moreover, it is insoluble or poorly soluble in any of the plurality of peeling aids mentioned above.

Specifically, polyvinyl butyral, vinyl chloride-vinyl acetate copolymer, vinylidene chloride-vinyl chloride copolymer,
Examples include ethyl cellulose, which can be used alone or in combination, and the amount used is 1 to 15% by weight, preferably 5 to 10% by weight, based on the total amount of the eraser.

In addition to the ingredients listed above, if necessary, preservatives, antifungal agents,
Wetting agent, viscosity modifier, antifreeze agent.

Various additives such as antifoaming agents and various general activators can be used as appropriate.

In addition, 1. The method for producing the ink eraser of the present invention is to mix the necessary amounts of the above-mentioned components that meet the mutual conditions among the components, and mix and stir using a stirrer such as a homomixer or a labo-poxa. It can be easily obtained by

(Example) The present invention will be described in more detail below according to Examples, and in the Examples, "parts" indicate "parts by weight."

An ink eraser was obtained by mixing and stirring the components of Examples 1 to 4 shown in Table 1 below using a homomixer.

Table-1 Supplementary explanation for Table 1> (1) Bio White P-60: Manufactured by Daikyo Sekiyu ■.

saturated hydrocarbon (2) Diarein 168: Manufactured by Mitsubishi Chemical Corporation ■.

Olefinic hydrocarbons (3) Nikkor BO-2: Manufactured by Nikko Chemicals ■.

polyoxyethylene oleyl ether (4) Neugen EA-70: Manufactured by Daiichi Kogyo Seiyaku ■.

Polyoxyethylene nonylphenyl ether (J))
Emuldan 306P: Polyoxyethylene stearyl ether (6) manufactured by Kao Atlas ■ Denka Butyral 2000-L: Polyvinyl butyral (7) manufactured by Denki Kagaku Kogyo ■ Vinyl chloride-vinyl acetate copolymer: 5. Manufactured by Nion Carbide Co., Ltd. (Effects of the Invention) Samples were prepared by filling the ink erasers obtained in Examples 1 to 4 and ethanol as a comparative example into a cotton-filled marker with a fiber core.

The results of the test are shown in Table 2.

Table 2 (Handwriting Erasing Test) *1. Handwriting Erasing Test Glass plate, OHP film, and aluminum plate each with an oil-based marker (Pentel Pen Junior High School).

N 50-A, manufactured by Bentel ■) and OHP marker (
Write a total of 9 characters in 3 vertical rows and 5 horizontal rows with Four Film PM4S-A (manufactured by Bentel ■), let it dry, and write the above sample on the character located in the center as shown in Examples 1 to 4. Apply the eraser of the comparative example.

After drying, wipe it with a cloth, etc. If the center character is completely erased and the surrounding eight characters are not affected at all, mark it as ○9.If the surrounding eight characters are blurred or erased, mark it as X. did.

As described above, the ink eraser of the present invention is made of glass.

This is an excellent product that can easily erase handwriting written on non-absorbing surfaces such as metal, ceramics, resin plates, OHP films, etc. without affecting surrounding handwriting.

Claims (1)

[Claims] Organic solvent; A compound group consisting of higher fatty acid esters, higher aliphatic hydrocarbons, polyoxyethylene alkyl ether type nonionic surfactants and their derivatives, polyoxyethylene alkylphenol ether type nonionic surfactants and their derivatives. and a plurality of stripping aids selected from the group of stripping aids that contain the organic solvent and have a higher vapor pressure than the organic solvent; soluble in the organic solvent and insoluble or poorly soluble in any of the plurality of stripping aids; An ink eraser consisting of at least a resin.