JP2006117740A - Marking ink composition for oil-adhered metal surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a marking ink composition for an oil-adhered metal surface which can form a clear image on the oil-adhered metal surface and is rich in convenience and practicality capable of satisfying identifiability in the manufacturing process since the image is not easily removed. <P>SOLUTION: The marking ink composition for an oil-adhered metal surface comprises at least a colorant, a resin and one or more solvents selected from alcohols, glycol ethers and esters. When 10 pts.wt. of the resin and 2 pts.wt. of a fat and oil essentially consisting of a mineral oil forms a film of 40 μm in thickness, the film has a light transmittance of 65% or less. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a marking ink composition for oil-attached metal surfaces. More specifically, the present invention relates to a marking ink composition for an oil-attached metal surface capable of forming a good image on a metal material with oil attached to the surface.

Conventionally, a water-based ink composition that forms an image on a metal surface to which oil adheres has been disclosed (see, for example, Patent Document 1).
However, the ink composition is difficult to transfer even if letters are written on a metal part to which oil is adhered, and a clear handwriting cannot be formed, so that the production efficiency is lowered. Further, even if characters can be formed, they are easily peeled off and difficult to discriminate, so that troubles in the manufacturing process tend to occur.
Japanese Patent Publication No. 45-39892

  The present invention is intended to solve the problems of the ink composition that forms a desired character or symbol on the above-described conventional metal part to which oil is adhered, that is, a clear image (character or symbol). Etc.), and the image is intended to provide a marking ink composition for oil-attached metal surfaces that does not easily peel off during the manufacturing process.

The present invention comprises an oil or fat 2 comprising at least a coloring agent, a resin, and one or more solvents selected from alcohols, glycol ethers and esters, and comprising 10 parts by weight of the resin and mineral oil as main components. A marking ink composition for oil-attached metal surfaces, in which the light transmittance of a 40 μm-thick film consisting of parts by weight is 65% or less, is required.
Furthermore, the resin is selected from phenolic resins, maleic acid resins, and ketone resins, the solvent contains glycol ethers, and occupies 10 to 65% by weight of the total solvent, It requires that dimethyl carbonate is contained therein and occupies 10 to 40% by weight of the total solvent, and that the colorant is a pigment.

  The present invention can form a clear image on a metal surface to which oil is adhered, and the image is not easily peeled off, so that the oil adhesion is rich in convenience and practicality that can satisfy the distinguishability in the manufacturing process. A marking ink composition for metal surfaces can be provided.

Examples of the dye used as the colorant include organic solvent-soluble dyes classified as solvent dyes in the color index.
Examples of pigments include inorganic pigments such as carbon black, ultramarine, and titanium dioxide pigments, azo pigments, phthalocyanine pigments, indigo pigments, thioindigo pigments, selenium pigments, quinacridone pigments, anthraquinone pigments, stron pigments, diketopyrrolopyrrole. And organic pigments such as pigments, dioxazine pigments, perylene pigments, perinone pigments and isoindolinone pigments.
In the present invention, a pigment from which a colorant hardly flows out from a portion where an image is formed to a portion where a metal surface image is not formed is preferably used.

Conventionally, a solvent selected from general-purpose alcohols, glycol ethers and esters can be used as the solvent, and it is used in the range of 40 to 80% by weight in the ink composition.
Examples of the alcohols include benzyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, isobutyl alcohol, sec-butyl alcohol, tert-butyl alcohol, tert-amyl alcohol and the like.
Examples of the glycol ethers include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monohexyl ether, ethylene glycol monophenyl ether, ethylene glycol diethyl ether, diethylene glycol monoethyl ether. , Diethylene glycol monophenyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monophenyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monophenyl ether, tripropylene glycol monomethyl ether, tripropylene glycol Bruno ethyl ether, tripropylene glycol monophenyl ether and the like.
Examples of the esters include dimethyl carbonate, methyl lactate, ethyl lactate, n-butyl formate, isobutyl formate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, ethyl propionate, n-butyl propionate, butyric acid. Examples include methyl and ethyl butyrate.
In addition, the adhesiveness to a metal surface can be improved more by containing 10-65 weight% of glycol ethers in a solvent.
In addition, by containing 1 to 40% by weight of dimethyl carbonate in the solvent, the ink viscosity does not increase excessively, so that the ink discharge from the marking pen (applicator) containing the ink composition is good, A suitable image can be formed.

As resins, ketone resins, ketone-formaldehyde resins, amide resins, alkyd resins, rosin-modified resins, rosin-modified phenol resins, phenol resins, xylene resins, polyvinylpyrrolidone, α- and β-pinene / phenol polycondensation resins, polyvinyl butyral resins An acrylic resin, a maleic acid resin, a styrene maleic acid copolymer, a cellulose derivative, polyvinyl pyrrolidone, polyvinyl alcohol, dextrin, and the like can also be used, and can be used for fixing to a metal surface or imparting viscosity.
In particular, a resin selected from a phenol resin, a maleic acid resin, and a ketone resin is preferably used because it has excellent hand-sticking property to a metal surface to which oil has adhered.

In the present invention, the light transmittance of a film having a thickness of 40 μm comprising 10 parts by weight of the resin contained in the ink and 2 parts by weight of fats and oils mainly composed of mineral oil is 65% or less. When the light transmittance of the film exceeds 65%, the resin and the oil and fat are highly compatible. Therefore, the handwriting obtained by writing on the metal surface to which the oil is adhered by the ink composition is also easily dissolved in the oil and fat. As a result, the handwriting is easily peeled off.
Therefore, by setting the light transmittance of the film to 65% or less, it is difficult for the resin and the oil and fat to be compatible with each other, so that a marking ink composition excellent in storage stability of the handwriting that does not easily peel off with a light rubbing process degree can be obtained. It is done.

The ink composition is practically used by filling a marking pen with a tip attached to a writing tip.
When filling the marking pen, the structure and shape of the marking pen itself are not particularly limited. For example, a fiber tip, felt tip, plastic tip is attached to the writing tip, and the fiber bundle contained in the shaft cylinder is used. The ink occlusion body is impregnated with ink, the ink is supplied to the tip of the writing, the ink is directly stored inside the shaft cylinder, and the ink flow rate adjustment member consisting of a comb groove-like ink flow rate adjustment member or fiber bundle is interposed Examples include a marking pen having a structure in which ink is directly stored in the shaft cylinder and a predetermined amount of ink is supplied to the writing tip portion by a valve mechanism.

For example, a molded body made of a thermoplastic resin such as polyethylene, polypropylene, polyethylene terephthalate, or nylon is used as the ink storage tube that stores the ink composition.
Furthermore, by using a transparent, colored transparent, or translucent molded body as the ink containing tube, the ink color, the remaining amount of ink, and the like can be confirmed.
In addition to directly connecting the chip to the ink storage tube, the ink storage tube and the chip may be connected via a connecting member.
The ink storage tube may be a refill type in which the refill is accommodated in the shaft cylinder, or the shaft cylinder itself having a tip mounted on the tip is used as an ink container to directly fill the shaft cylinder with ink. May be.
In addition, the form of the marking pen is not limited to that described above, and it may be a twin-type writing instrument on which a pen body having a different form is attached or a pen body on which a different color tone is derived is attached.

The following table shows the composition of each example and comparative example.

The contents of the raw materials in the table will be explained according to the note numbers.
(1) Nichihiro Bix Co., Ltd., trade name: NSP-BT 806F black (15% pigment content)
(2) Product name: No. manufactured by Nippon Color Co., Ltd. 150 white paste (49% pigment content)
(3) Made by Clariant Japan Co., Ltd., trade name: Renol Red F5RK-HW30, C.I. I. Pigment Red 170 (pigment content 50%)
(4) Johnson Polymer Co., Ltd., trade name: John Krill 68
(5) Gunei Chemical Co., Ltd., trade name: RESITOP PS-2980
(6) Arakawa Chemical Industries, Ltd., trade name: Marquide No. 33
(7) Product name: Synthetic Resin SK, manufactured by Huls Japan
(8) Product name: # 52, manufactured by Mitsubishi Chemical Corporation
(9) Made by Mizusawa Chemical Co., Ltd., trade name: Silwhite M-1
(10) Product name: NSP-ET 031C White (pigment content 64%), manufactured by Nichihiro Bix
(11) Made by Malay Coban Dairy Co., Ltd. (12) Made by Daiichi Kogyo Seiyaku Co., Ltd., trade name: Neogen SC-A
(13) Product name: Quinton 1500, manufactured by Nippon Zeon Co., Ltd.
(14) Arakawa Chemical Industries, Ltd., trade name: Tamanoru 100S
(15) Hitachi Chemical Co., Ltd., Hitanol 1501
(16) Average molecular weight 400

Light transmittance test 10 parts by weight of the resin contained in the ink composition prepared in each of the above Examples and Comparative Examples and 2 parts by weight of fats and oils mainly composed of mineral oil were mixed and applied to the surface of the transparent film to obtain a thickness of 40 μm. The film was formed.
The maximum light transmittance (%) in the visible light region (400 to 700 nm) of the film was measured using a Spectrophotometer (manufactured by Hitachi, U-3210).
In Comparative Example 1, since the resin and the oil and fat were not mixed, no film was formed.

Preparation of the marking pen The shaft cylinder containing the valve mechanism is filled with the ink of each example and comparative example, and a polyester fiber resin processing pen body is attached to the tip, and the pen body is opened by pressing. A marking pen with a valve mechanism was prepared.

Scratch test Using each of the marking pens described above, after writing on a metal standard test plate [JIS G 3141 (SPCC to SB)] coated with 5.5 mg / cm ^{2 of} oil and fat mainly composed of mineral oil, the diameter was 2 cm. Using a circular cotton cloth, the state of the handwriting was visually observed by rubbing once at a load of 500 g at a speed of 5 cm per second.

The table below shows the results of the light transmittance test and the scratch test.

The symbols for the evaluation of the scratch test in the table are as follows.
A: The handwriting does not peel off.
○: Although the handwriting peels off slightly, it is a category having no practical problem.
X: Handwriting peels off and cannot be identified.

Claims (5)

  It comprises at least one colorant, a resin, and one or more solvents selected from alcohols, glycol ethers, and esters, and comprises 10 parts by weight of the resin and 2 parts by weight of fats and oils mainly composed of mineral oil. A marking ink composition for oil-attached metal surfaces, wherein the light transmittance of a film having a thickness of 40 μm is 65% or less.   The marking ink composition for oil-attached metal surfaces according to claim 1, wherein the resin is selected from a phenol resin, a maleic acid resin, and a ketone resin.   The marking ink composition for oil-attached metal surfaces according to claim 1 or 2, comprising glycol ethers in the solvent and occupying 10 to 65% by weight of the total solvent.   The marking ink composition for oil-attached metal surfaces according to any one of claims 1 to 3, comprising dimethyl carbonate in the solvent and occupying 10 to 40% by weight of the total solvent.   The marking ink composition for oil-attached metal surfaces according to any one of claims 1 to 4, wherein the colorant is a pigment.