JP2006219582A - Marking ink composition with metallic luster color for oil-attached metal surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a marking ink composition with a metallic luster color for an oil-attached metal surface, capable of forming a clear metallic color image on a metal surface to which oil is attached, hardly causing peeling off of the image, and having many convenient properties and utilities satisfying discrimination properties in a production process. <P>SOLUTION: The marking ink composition with the metallic luster color for the oil-attached metal surface comprises at least a metallic luster pigment, a resin, one or more kinds of solvents selected from glycol ethers and esters. The remaining area of a dried film is ≥80% of the coated area before the rubbing when the coated plate which is obtained by coating the ink composition on the SPCC-SB steel plate coated with 5.5 mg/cm<SP>2</SP>oily material consisting essentially of a mineral oil and drying the ink composition is rubbed with a cotton fabric under 50 g-load/cm<SP>2</SP>load. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a metallic glossy marking ink composition for oil-attached metal surfaces. More particularly, the present invention relates to a metal gloss color marking ink composition for oil-attached metal surfaces, which can form a good metal gloss 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 for forming a desired character or symbol on the above-described conventional metal part to which oil is adhered, that is, a clear metallic gloss image (character The image is intended to provide a metallic glossy marking ink composition for oil-attached metal surfaces that does not easily peel off during the manufacturing process.

The present invention is an ink composition comprising at least a metallic luster pigment, a resin, and one or more solvents selected from glycol ethers and esters, wherein an oily substance containing mineral oil as a main component is 5 When the dry film obtained by applying the ink composition to the SPCC-SB steel sheet coated with 0.5 mg / cm ^{2 is} rubbed with a cotton cloth at a load of 50 g / cm ² , the remaining area of the film is 80% or more before the rub. A metal gloss color marking ink composition for oil-attached metal surfaces is a requirement.
Furthermore, the resin is selected from phenolic resins, maleic acid resins, and ketone resins, the metallic luster pigment is non-leafing aluminum powder or brass powder, and the solvent contains glycol ethers. And occupying 60 to 99% by weight of the total solvent, dimethyl carbonate in the solvent, and occupying 1 to 40% by weight of the total solvent.

  The present invention can form a clear metallic gloss image on a metal surface to which oil is adhered, and the image is not easily peeled off. Therefore, the present invention is highly convenient and practical enough to satisfy discriminability in the manufacturing process. A metallic glossy marking ink composition for oil-attached metal surfaces can be provided.

Examples of the metallic luster pigment used as the colorant include aluminum powder, tin powder, lead powder, zinc powder, stainless steel powder, nickel powder, iron powder, copper powder, copper alloy powder, brass powder, gold powder, silver powder, and natural powder. A transparent substance such as mica, synthetic mica, glass, alumina or the like as a core substance, and a surface coated with a metal oxide such as titanium, zirconium, chromium, vanadium, iron, etc., a multilayer film finely divided, Examples include those obtained by finely pulverizing an aluminum-deposited transparent film, those obtained by pulverizing an aluminum-deposited hologram film, and those of a cholesteric liquid crystal type.
As the aluminum powder, either a leafing type whose surface is treated with a saturated higher fatty acid or a non-leafing type treated with an unsaturated fatty acid may be used, but preferably a non-leafing type aluminum powder is used.
In addition to the metallic luster pigment, organic solvent-soluble dyes, 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 Organic pigments such as throne pigments, diketopyrrolopyrrole pigments, dioxazine pigments, perylene pigments, perinone pigments, and isoindolinone pigments can also be used in combination.

Conventionally, a solvent selected from general-purpose 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 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 60-99 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, a dry film obtained by applying the above-mentioned ink composition to an SPCC-SB steel plate coated with 5.5 mg / cm ^{2 of} an oil mainly composed of mineral oil has a weight of 50 g / The remaining area of the film when rubbed with a cm ² load is 80% or more before the rub.
If the remaining area of the film after rubbing is less than 80% before rubbing, that is, if the film is soft, it is difficult to peel off easily.
Therefore, by setting the remaining area to a film strength of 80% or more before rubbing, a marking ink composition having excellent handwriting storage stability that does not easily peel off at a light rubbing degree can be obtained.

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, or a metal such as aluminum is used as the ink storage tube for storing the ink composition.
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) Toyo Aluminum Co., Ltd., trade name: Alpaste 6370NS (70% pigment content)
(2) Degussa Japan Co., Ltd., trade name: Offset 3000 Super (3) Johnson Polymer Co., Ltd., trade name: John Krill 68
(4) Arakawa Chemical Industries, Ltd., trade name: Marquide No. 33
(5) Gunei Chemical Co., Ltd., trade name: RESITOP PS-2980
(6) Product name: Synthetic Resin SK, manufactured by Huls Japan
(7) Nippon Zeon Co., Ltd., trade name: Quinton 1500

Preparation of marking pen Each ink composition is opened by attaching a polyester fiber resin processing pen body to the tip of an aluminum shaft cylinder containing a metal stirring sphere inside and pressing the pen body. The marking pen of the mechanism was filled.

Scratch test On a surface coated with a 5.5 mg / cm ² 40 mil bar coater on an SPCC-SB steel plate (bright steel plate), an oily substance (manufactured by Yushiro Chemical Co., Ltd., trade name: Yusilon Oil CG8) mainly composed of mineral oil. In addition, writing was performed using each of the marking pens, and the film was allowed to stand at room temperature for 2 hours to form a dry film.
Next, a 20 mm square cotton cloth (conforming to JIS L 0830) was placed on the dried film, and a 200 g load was applied and rubbed once at a speed of 5 cm per second.
The remaining area was calculated by comparing the film after rubbing with the initial film (compared by a photograph).
The following table shows the results of the abrasion test.

The symbols for the evaluation of the scratch test in the table are as follows.
(Double-circle): The residual area of a film | membrane is 90% or more compared with the initial stage (before rubbing).
◯: The remaining area of the film is 80% or more and less than 90% compared to the initial stage (before rubbing).
(Triangle | delta): The residual area of a film | membrane is 50% or more and less than 80% compared with the initial stage (before rubbing).
X: The remaining area of the film is less than 50% compared to the initial stage (before rubbing).

Claims (5)

An ink composition comprising at least a metallic luster pigment, a resin, and one or more solvents selected from glycol ethers and esters, and an oily substance containing mineral oil as a main component is 5.5 mg / cm ^{2 When the} dry film obtained by applying the ink composition to the coated SPCC-SB steel sheet is rubbed with a cotton cloth at 50 g weight / cm ² load, the remaining area of the film is 80% or more before rubbing. A metallic glossy marking ink composition for oil-attached metal surfaces.   The metallic glossy marking ink composition for oil-attached metal surfaces according to claim 1, wherein the resin is selected from phenolic resins, maleic acid resins, and ketone resins.   The metallic glossy marking ink composition for oil-attached metal surfaces according to claim 1 or 2, wherein the metallic luster pigment is non-leafing aluminum powder or brass powder.   The metallic gloss color marking ink composition for oil-attached metal surfaces according to any one of claims 1 to 3, comprising glycol ethers in the solvent and occupying 60 to 99% by weight of the total solvent.   The metallic glossy marking ink composition for oil-attached metal surfaces according to any one of claims 1 to 4, comprising dimethyl carbonate in the solvent and occupying 1 to 40% by weight of the total solvent.