JP4527813B2 - Information display surface forming ink and printed matter - Google Patents

Description

【００４２】
表１より、実施例の印刷物は、紫外線硬化樹脂を主成分とし、天然有機物を含有するインキを使用して情報表示面となる塗膜が形成されたものであるため、印字性、筆記性、印鑑受理性、耐アルコール性、耐次亜塩素性及びタッチ感のいずれの特性も良好であることがわかる。
【００４３】
一方、比較例の印刷物は、紫外線硬化樹脂を主成分とするが、天然有機物の代わりにシリカパウダーを含有するインキを使用して情報表示面となる塗膜が形成されたものであるため、印字性、筆記性、印鑑受理性、耐アルコール性、耐次亜塩素性及びタッチ感のいずれの特性も不良であることがわかる。
【００４４】
【発明の効果】
本発明に係る情報表示面形成用インキは、紫外線硬化樹脂及び天然有機物を主成分とするインキであるため、このインキが印刷された印刷物は、タッチ感、耐薬品性及び筆記受理性のいずれも良好である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ink for forming an information display surface constituting a medium for writing or printing characters or the like on the surface of a plastic product, a glass product or the like, and a printed matter using the same.
[0002]
[Background]
When writing or printing information such as letters, numbers, figures, etc. directly on plastic products, glass products, metal products, etc., the surface is smooth, so it may be clear and resistant to general writing instruments and normal inks. It is difficult to obtain frictional characters.
For this reason, conventionally, stickers, paper labels, and the like are attached to these products, and information is written on these stickers.
[0003]
However, when using seals, paper labels, etc., it is necessary to prepare seals and affix them to the product one by one, which is troublesome. Also, in the case of resin bottles, especially shampoo bottles, since the place where they are used is in hot and humid conditions such as in a bathroom, paper labels etc. have poor water resistance and have drawbacks such as peeling off during use. .
[0004]
On the other hand, an ink for forming an information display surface is prepared by blending silica or the like into a resin, and this ink is printed on the surface of a plastic product or the like to form a coating film, and information is written using this coating film as a medium. Has also been done. In recent years, ultraviolet curable resins have also been used as resins, and information display surface forming inks containing these ultraviolet curable resins are very excellent in terms of productivity, coating film properties, and the like. The information display surface forming ink is becoming mainstream.
[0005]
Since the ink for forming an information display surface containing this ultraviolet curable resin has a low solvent content, it is excellent in work environment and the coating film has a short curing time. Moreover, the strength of the coating film is also excellent. Therefore, this ink is expected to rapidly spread to other fields such as the packaging field in the future.
[0006]
As a new application field of such an ink, a CD-R which is a writable CD can be mentioned in particular. The CD-R needs to have the recorded content written on the surface in the same way as the cassette tape, but the paper label may be peeled off, which may cause a failure of the CD drive. Accordingly, demand for such a problem-free ink is expected as a medium for forming a CD-R information display surface.
[0007]
[Problems to be solved by the invention]
The information display surface-forming ink containing the above-described ultraviolet curable resin has various features, but is not completely free of problems.
That is, the conventional ink for forming the information display surface is inferior in chemical resistance, and when the printed matter printed with this ink is immersed in, for example, ethanol for 24 hours, the coating film becomes brittle and the coating film is peeled off. . Currently, an additive is included in order to improve the alcohol resistance of the coating film formed with the information display surface forming ink.
[0008]
However, according to this method, a complicated operation of preparing the information display surface forming ink as a two-component type immediately before printing is required. Further, if the prepared ink remains, it is not suitable for long-term storage, and is discarded. Further, when the printing operation is continued for a long time, problems such as a printing failure due to an increase in viscosity, a change in hue, and deterioration in curability occur as time passes.
[0009]
In addition, conventional information display surface forming inks have features such as extremely high coating strength and excellent water resistance, but on the other hand, they are too hard and have no water absorption. It also has the disadvantage of being inferior in touch and writing acceptability (ease of writing). In addition, by adding a matting agent such as silica powder in the ink to make the surface of the coating a matte tone, it has been devised to improve the aesthetics and touch feeling, but a sufficient improvement effect has not been obtained .
[0010]
Then, an object of this invention is to provide the printed matter printed using the ink for information display surface formation which can aim at an improvement of touch feeling, chemical-resistance, and writing acceptance, and this ink.
[0011]
[Means for Solving the Problems]
The ink for forming an information display surface according to the first aspect of the present invention is characterized by comprising an ultraviolet curable resin and a natural organic substance as main components.
Arbitrary things, such as urethane acrylate, an epoxy acrylate, polyester acrylate, can be used as a resin seed | species of the said ultraviolet curable resin. Moreover, about the monomer mix | blended simultaneously in ink, a lactam type, an ether type, an aromatic type etc. can be used arbitrarily.
In addition, this ink includes what is called a paint depending on the field of use.
[0012]
Since the present invention contains natural organic substances in the ink, the touch feeling, chemical resistance and writing acceptability of the coating film formed using the ink are improved. Since the surface of the coating film has a matte tone, it is possible to impart a high-class feeling to the printed matter.
Moreover, since it is a one-pack type, preparation before printing is not required, handling becomes easy, and handling is not required. Since the pot life is long, less ink is discarded, which is economically and environmentally preferable. Furthermore, since properties such as viscosity do not change over time, it is suitable for long-time continuous printing.
[0013]
The ink for forming an information display surface according to a second aspect of the present invention is the ink according to the first aspect, wherein the natural organic substance is collagen, wool, keratin, eggshell membrane, silk, cellulose, hemp, cotton, chitin, chitosan, water-soluble silk. And one or more types selected from betaine.
The collagen, wool, keratin, eggshell membrane, silk, cellulose, hemp, cotton, chitin, and chitosan are water-insoluble natural organic substances.
The water-soluble silk (soluble silk protein reduced in molecular weight by enzymatic degradation or the like) and betaine are water-soluble natural organic substances.
[0014]
In the information display surface forming ink according to the third aspect of the present invention, in the first or second aspect, the content of the natural organic substance is 1 to 50 wt%.
When the content of the natural organic material exceeds 50 wt%, the possibility of causing deterioration in physical properties of the coating film and poor curing is increased. Preferably, it is 10 to 40 wt%. On the other hand, when it is less than 1 wt%, it is difficult to obtain good touch feeling, chemical resistance and writing acceptability of the coating film.
[0015]
In the information display surface forming ink according to the fourth aspect of the present invention, in any one of the first to third aspects, the natural organic material is a powder.
The natural organic material may be in the form of a powder.
[0016]
In the information display surface forming ink according to the fifth aspect of the present invention, in the fourth aspect, the natural organic powder has an average particle size of 60 μm or less.
When the average particle size exceeds 60 μm, the surface of the coating film becomes rough, the touch feeling becomes poor, the printability is lowered, and the possibility of causing poor curing is increased. The thickness is preferably 30 μm or less, more preferably 15 μm or less, and most preferably 5 μm or less.
[0017]
The information display surface forming ink according to the sixth aspect of the present invention is water-based in any one of the first to fifth aspects.
For example, water-soluble natural organic substances such as water-soluble silk and betaine are blended with water-based ultraviolet curable ink (water-based UV ink). When this water-soluble natural organic substance is dissolved in water-based UV ink by blending 1 to 50 wt%, preferably about 5 to 20 wt%, the water-soluble natural organic substance is uniformly dispersed in the ink. A coating film can be obtained. Further, unlike the powder dispersion state, the surface of the coating film is smooth, which contributes to the improvement of the uniformity of writing acceptability.
In addition, when dissolving water-soluble natural organic matter, some water-based ultraviolet curable inks may become unstable due to ionicity, and may rarely cause problems such as gelation. Care must be taken with the combination of natural organic matter and ink.
[0018]
A printed matter according to a seventh aspect of the present invention is printed on a printed matter using the information display surface forming ink according to any one of the first to sixth aspects.
The specific method of this printing (coating) is arbitrary, for example, silk screen printing, pad printing, gravure printing (coater), roll coater, knife coater, etc. can be used. Depending on the printing method, it is necessary to select an appropriate particle size of the powder to be used according to the screen mesh size, the depth of the gravure plate, and the like.
The printed material includes what is called a coated material depending on the field.
[0019]
The material to be printed is arbitrary, and includes, for example, all kinds of packages, electrical products, automobile parts, precision parts, compact discs, various plastic molded products, metal, glass, painted plates, courier slips, etc. . In addition, application to graphics, design, and printing imparted with functionality (chemical resistance, writing acceptability, etc.) is also conceivable.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
The information display surface forming ink of the present embodiment is an ultraviolet curable resin, one type selected from collagen, wool, keratin, eggshell membrane, silk, cellulose, hemp, cotton, chitin, chitosan, water-soluble silk, and betaine. Two or more types of natural organic substances can be prepared by adding and stirring and dispersing so that the content is 1 to 50 wt%.
The printed material of the present embodiment is obtained by printing a printed material using this ink to form a coating film for forming an information display surface.
[0021]
【Example】
[ Reference Example 1]
In the above embodiment, a varnish mainly composed of urethane acrylate, which is an ultraviolet curable resin, is used, and collagen powder is used as a natural organic powder. The ink for forming an information display surface of this reference example was prepared by stirring and dispersing under conditions of 40 ° C. or lower and 1000 rpm.
The varnish used was Celicol UV PAL (trade name, manufactured by Teikoku Ink Manufacturing Co., Ltd.). The average particle diameter of the collagen powder is 5 μm.
[0022]
Next, this information display surface forming ink was silk-screened (380 mesh) on a framed polyethylene sheet to form a coating film to be an information display surface.
Next, the sheet on which the coating film was formed was placed on a belt and moved at a speed of 10 m / sec, and the coating film was cured with a metal halide lamp (80 W / cm × 2 lamps) to obtain a printed matter of this reference example. .
[0023]
[ Reference Example 2]
The natural organic powder in Reference Example 1 was replaced with wool powder (average particle size 7 μm), and an ink for forming an information display surface was prepared in the same manner as in Reference Example 1, and a printed matter was obtained.
[0024]
[ Reference Example 3]
The natural organic powder in Reference Example 1 was replaced with keratin powder (average particle size 7 μm), and an information display surface forming ink was prepared in the same manner as in Reference Example 1, and a printed matter was obtained.
[0025]
[ Reference Example 4]
The natural organic powder in Reference Example 1 was replaced with silk powder (average particle size 5 μm), and an ink for forming an information display surface was prepared in the same manner as in Reference Example 1, and a printed matter was obtained.
[0026]
[ Reference Example 5]
The natural organic powder in Reference Example 1 was replaced with eggshell membrane powder (average particle size 8 μm), and an ink for forming an information display surface was prepared in the same manner as in Reference Example 1, and a printed matter was obtained.
[0027]
[ Reference Example 6]
The natural organic powder in Reference Example 1 was replaced with cellulose powder (average particle size 5 μm), and an ink for forming an information display surface was prepared in the same manner as in Reference Example 1, and a printed matter was obtained.
[0028]
[ Reference Example 7]
The natural organic powder in Reference Example 1 was replaced with hemp powder (average particle size 7 μm), and an information display surface forming ink was prepared in the same manner as in Reference Example 1, and a printed matter was obtained.
[0029]
[ Reference Example 8]
The natural organic powder in Reference Example 1 was replaced with cotton powder (average particle size 7 μm), and an ink for forming an information display surface was prepared in the same manner as in Reference Example 1, and a printed matter was obtained.
[0030]
[ Reference Example 9]
An ink for forming an information display surface was prepared in the same manner as in Reference Example 1 by replacing the natural organic powder in Reference Example 1 with wood powder (average particle size 8 μm), and a printed material was obtained.
[0031]
[ Reference Example 10]
The natural organic powder in Reference Example 1 was replaced with chitin powder (average particle size 10 μm), and an information display surface forming ink was prepared in the same manner as in Reference Example 1, and a printed matter was obtained.
[0032]
( Reference Example 11)
The natural organic powder in Reference Example 1 was replaced with chitosan powder (average particle size 8 μm), and an information display surface forming ink was prepared in the same manner as in Reference Example 1, and a printed matter was obtained.
[0033]
Example 12
Stirring the ultraviolet curing resin in Example 1 was changed to an aqueous UV ink, this ink 100 parts by weight, a material obtained by blending a silk powder (average particle size 5 [mu] m) 40 parts by weight of the natural organic powder in the same manner as in Reference Example 1 The ink for forming the information display surface of this example was prepared by dispersing. The water-based UV ink used is Celicol UV-AU (trade name, manufactured by Teikoku Ink Manufacturing Co., Ltd.).
Further, using this information display surface forming ink, a printed matter of this example was obtained in the same manner as in Reference Example 1.
[0034]
( Reference Example 13)
A mixture of 5 parts by weight of betaine and 5 parts by weight of methyl celcose derivative was used as a natural organic powder, and an ink for forming an information display surface was prepared in the same manner as in Reference Example 1, and a printed matter was obtained.
[0035]
Example 14
Reference Example 1 was prepared by blending water-soluble silk with a solid content ratio of 5% with respect to 20 parts by weight of silk powder (average particle size: 5 μm) and 100 parts by weight of water-based UV ink (sericol UV-AU). In the same manner, the ink for forming an information display surface of this example was prepared by stirring and dispersing.
Further, using this information display surface forming ink, a printed matter of this example was obtained in the same manner as in Reference Example 1.
[0036]
[Comparative Example 1]
Information on this comparative example is obtained by using silica powder, which is a natural inorganic powder, instead of natural organic powder, and mixing and dispersing 15 parts by weight of this silica powder and 100 parts by weight of varnish in the same manner as in Reference Example 1. A display surface forming ink was prepared.
Further, using this information display surface forming ink, a printed matter of this comparative example was obtained in the same manner as in Reference Example 1.
[0037]
Next, the printability, writing property, seal acceptability, alcohol resistance, hypochlorite resistance, and touch feeling were evaluated for the printed materials obtained in the examples and comparative examples. The results are shown in Table 1 below.
[0038]
The evaluation methods and evaluation criteria for the characteristics are as follows.
The evaluation of the printability was performed by measuring the drying time until the print was dried after printing with a printer [BUBBLE JET PRINTER BJ10V Lite (trade name) manufactured by Canon Inc.]. Within 3 minutes: less than 2: 1 hours, 1: 1 hours or more.
[0039]
The evaluation of the writing property was performed by writing the letter “A” using a water-based ink pen [Mitubishi PIN (trade name) manufactured by Mitsubishi Pencil Co., Ltd.] and performing sensory evaluation on the ease of writing at that time. 3: Especially easy to write, 2: Easy to write, 1: Hard to write.
Evaluation of the seal acceptability was performed by measuring the drying time until the printing dries after stamping with a rubber stamp. Within 3 minutes: less than 2: 1 hours, 1: 1 hours or more.
[0040]
The evaluation of the alcohol resistance was performed according to a JIS cross-cut test after the coating film was immersed in 99.5% ethanol for 24 hours. 3: 6 points or more, 2: 3 to 5 points, 1: 2 points or less.
The hypochlorite resistance was evaluated by immersing a plate on which a coating film was formed in a sodium hypochlorite 1.1% aqueous solution for 24 hours, washing and drying the plate, and rubbing the coating film with gauze 20 times. This was done by examining whether the substrate was exposed. 3: No substrate exposed, 2: Substrate exposed slightly, 1: Base completely exposed.
Evaluation of the touch feeling was performed by having 10 people perform sensory evaluation. The figures in the table are the average of 10 people. 3: Good, 2: Normal, 1: Bad.
[0041]
[Table 1]

[0042]
From Table 1, the printed materials of the examples are mainly composed of an ultraviolet curable resin, and a coating film serving as an information display surface is formed using an ink containing a natural organic material. Therefore, printability, writing property, It can be seen that all the characteristics of seal acceptance, alcohol resistance, hypochlorite resistance and touch feeling are good.
[0043]
On the other hand, the printed matter of the comparative example is composed mainly of an ultraviolet curable resin, but a coating film that becomes an information display surface is formed using ink containing silica powder instead of natural organic matter. It can be seen that all of the properties such as property, writing property, seal acceptability, alcohol resistance, hypochlorite resistance and touch feeling are poor.
[0044]
【The invention's effect】
Since the ink for forming an information display surface according to the present invention is an ink mainly composed of an ultraviolet curable resin and a natural organic substance, the printed matter on which the ink is printed has all of touch feeling, chemical resistance and writing acceptability. It is good.

Claims (5)

An information display surface forming ink mainly composed of an aqueous ultraviolet curable resin and a natural organic substance,
The natural organic material is at least one selected from collagen, wool, keratin, eggshell membrane, silk, cellulose, hemp, cotton, chitin, chitosan, water-soluble silk and betaine;
An ink for forming an information display surface, wherein the ink is water-based.   2. The information display surface forming ink according to claim 1, wherein the content of the natural organic material is 1 to 50 wt%.   The information display surface forming ink according to claim 1, wherein the natural organic material is a powder.   The information display surface forming ink according to claim 3, wherein the natural organic powder has an average particle size of 60 μm or less.   The printed matter printed on the to-be-printed material using the ink for information display surface formation in any one of the said Claims 1-4.