JP2003246956A - Specific ink and printed article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain ink with which a printed article having high specular gloss is produced and which has excellent printability and the printed article which has high specular gloss and excellent resistance of an ink layer. <P>SOLUTION: The ink comprises 100 aluminum foil containing ≥80%, preferably ≥86% of aluminum foil pieces having <0.3 μm, preferably <0.25 μm thickness and 20 μm<SP>2</SP>-2,000 μm<SP>2</SP>foil area, ≥3 wt.% and <15 parts wt. of a binder 600-4,000 parts wt. of a solvent. The binder in an amount of ≥3 parts wt. and <15 parts wt. is used based on 100 parts wt. of the aluminum foil. When the amount of the binder is <3 parts wt., the printability of the ink is reduced. When the amount of the binder is ≥15 parts wt., reduction in specular gloss of a printed article is recognized but when the amount of the binder is <15 parts wt., the specular gloss is outstandingly excellent. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed matter having an extremely high degree of specular gloss and an ink used for producing the same.

[0002]

2. Description of the Related Art It is well known that aluminum foil is added to printing ink to prepare a so-called metallic ink. However, the printed matter printed with the metallic ink has a fine glitter and does not give specular gloss.

Further, Japanese Patent Laid-Open Publication No. 7-17901.
No. 6 describes a bright printed matter having a metallic luster, and specifically, the ratio of aluminum powder containing 90% or more of aluminum powder having a particle size of 5 to 20 μm and the binder made of a transparent resin is Weight ratio 50:10 to 10:
A printed matter printed with an ink having a dilution solvent of 30 and a diluting solvent of 5 to 15 times the total weight of the aluminum powder and the binder is described (hereinafter referred to as Conventional Example 1).

Further, Japanese Patent No. 315 relating to the invention of the present inventor
The 1616 discloses, with respect to the aluminum foil 100 parts by weight of an aluminum-containing foil strips has a thickness of 20μm ² ~2000μm ² is foil area at 0.5μm or less than 75% binder polymer 15-200 parts by weight of solvent 600 An ink containing ˜3000 parts by weight is described (hereinafter referred to as Conventional Example 2). In this conventional example 2, when the binder polymer is less than 15 parts by weight, the printability of the ink is lowered and the resistance of the printed ink layer is poor, and when the binder polymer is more than 200 parts by weight, the specular gloss of the printed matter is deteriorated. It is supposed to fall.

[0005]

However, it has been found that even if the ink of Conventional Example 1 is actually used for printing, a printed matter having a high specular gloss cannot be obtained. Further, even when printing was performed using the ink of Conventional Example 2, the specular gloss was improved as compared with that of Conventional Example 1, but was not sufficiently satisfactory.

Therefore, an object of the present invention is to provide an ink having sufficient printability and capable of producing a printed matter having a higher degree of specular gloss. Another object is to provide a printed matter having a higher degree of specular gloss and excellent ink layer resistance.

[0007]

In order to solve the above problems, the present invention has a thickness of less than 0.3 μm, preferably less than 0.25 μm and a foil area of 20 μm ^{2 to} 2000 μm.
80% or more, preferably 86% of aluminum foil piece ²
% With respect to 100 parts by weight of aluminum foil, 3
Binder and solvent 60 parts by weight or more and less than 15 parts by weight
An ink comprising 0 to 4000 parts by weight is provided.

The thickness of the foil piece of the aluminum foil used in the present invention is less than 0.3 μm, preferably less than 0.25. When the thickness of the aluminum foil used is 0.3 μm or more, the desired printed matter having a very high specular gloss cannot be obtained.

The aluminum foil used in the present invention is
Aluminum foil pieces of foil area 20μm ² ~2000μm ² as a main component, integrated area of such foil pieces it is necessary to account for over 80% of the total foil area. The area of the foil piece can be determined by observing the sufficiently diluted ink with a microscope and image-analyzing the observed area of the foil piece. Therefore, the area of the foil piece here means the area of one surface of the foil piece. If there are many foil pieces having a foil area of 20 μm ² or less, a high degree of specular gloss cannot be obtained. The foil area is 2000
When there are many foil pieces of μm ² or more, streaks and print unevenness are likely to occur in screen printing, gravure printing, flexographic printing and the like.

Therefore, 80% or more of the entire aluminum foil used in the present invention has a foil area of 20 μm ^{2 to} 2000 μm.
m ^2, preferably must be a foil piece of 20μm ² ~1500μm ^2.

Next, in the ink of the present invention, 3 parts by weight or more and less than 15 parts by weight of a binder is used with respect to 100 parts by weight of the aluminum foil. Preferably 6 to 14 parts by weight are used. If the amount of the binder is less than 3 parts by weight, the printability of the ink will be extremely deteriorated and the resistance of the printed ink layer will be remarkably poor. However, when the amount of the binder is 3 parts by weight or more, the printability of the ink is good within the practical range, and the durability of the printed ink layer is not extremely deteriorated. However, when the amount of the binder exceeds 15 parts by weight, the specular gloss of the printed matter decreases. But 1
When it is less than 5 parts by weight, the specular gloss is excellent.

As the binder, any binder that can be generally used as a binder for printing inks can be used. Examples thereof include polyester, poly (meth) acrylic acid ester, vinyl chloride copolymer, polyurethane, Epokin resin, and cellulose derivative.

Also, the binder of the ink of the present invention need not be composed purely of a polymer. Of course, polymers are the most preferable as a binder because they have a strong binding force, but oligomers and tacky plasticizers may also be useful in some cases. Therefore,
The amount of binder in the present invention is quantified as follows. That is, solid matters such as aluminum foil pieces in the ink of the present invention are removed by a centrifugal separation method or the like to separate a solution portion constituting the ink, and first, a low boiling point solvent in the solution is volatilized, and further at 80 ° C., 0 ° C. 2 under reduced pressure of 0.5 to 2 KPa
Hold for 4 hours to remove residual solvent and the like. The amount of the residue remaining after such an operation is defined as the binder amount.

The solvent used is one that dissolves the binder, or one that dilutes the solution. Typical examples are esters, ethers, ketones,
There are aromatic hydrocarbons and the like.

The total amount of the solvent or diluent used is 600 to 4000 parts by weight based on 100 parts by weight of the aluminum foil. When the amount is 600 parts by weight or less, the specular gloss of the printed matter is reduced, and when the amount is 4000 parts by weight or more, the printability of the ink is extremely reduced.

In the ink thus prepared, the viscosity of the ink is 30 to 1000 cps (20 ° C.).
In the above, it is preferably in the range of (measured by BM type rotational viscometer).

Further, in the ink of the present invention, a transparent pigment or dye may be added to change the color tone of the specular gloss of the printed matter. If necessary, a leveling agent, a defoaming agent, etc., which are added to ordinary inks, can be added.

[0018]

EXAMPLES Examples of the present invention and comparative examples are shown below.

Example 1 100 parts by weight of aluminum foil containing 87% of aluminum foil pieces having a thickness of 0.23 μm and a foil area of 20 to 2000 μm ² , 10 parts by weight of polyester resin, 800 parts by weight of ester solvent, ketone system Gravure printing was performed on the back surface of the transparent polyester film using an ink containing 500 parts by weight of a solvent. The appearance of the surface of the obtained film had a very high degree of specular gloss. Also, gravure printing could be practically performed well.

Example 2 100 parts by weight of aluminum foil containing 86% of foil pieces having a thickness of 0.28 μm and a foil area of 20 to 2000 μm ² .
An ink containing 5 parts by weight of a (meth) acrylic acid ester resin and 1250 parts by weight of a glycol ether solvent was used to screen print the back surface of a transparent polycarbonate sheet. The surface of the obtained sheet had a very high specular gloss. Also, screen printing could be performed well.

Example 3 Overprinting was performed on the printing ink of the printed material obtained in Example 2 by screen printing with an ink having the following composition. The specular gloss of the surface of the transparent sheet is retained,
The overall ink resistance was significantly improved. The composition of the ink used for overprinting was 15% by weight of acrylic resin, 70% by weight of glycol ether solvent, 10% by weight of carbon black, and 5% by weight of printability-imparting agent.

Comparative Example 1 Aluminum foil with a thickness of 0.3 μm and a foil area of 20
μm^Two~ 2000 μm ^Two50 pieces of aluminum foil which is
%, And the foil area is 20 μm^TwoLess than a minute foil piece
Using 100 parts by weight of aluminum foil containing 50%,
Example 1 except using 30 parts by weight of polyester resin
I went the same way.

The appearance of the surface of the obtained film is shown in Example 1.
The printed matter had darkening and the gloss was significantly inferior.

Comparative Example 2 An aluminum foil having a thickness of 1 μm and a foil area of 20 μm
^{The same} procedure as in Example 1 was performed except that the aluminum foil 100 containing 85% of the aluminum foil pieces of ^{2 to} 2000 μm ² was used in parts by weight and the acrylic ester resin was used in 3 parts by weight.

The appearance of the surface of the obtained film did not have a mirror-like uniform gloss, but had a so-called metallic luster in which glitters were scattered. In addition, the printability during gravure printing was poor, and the resistance of the printed ink layer was poor.

Comparative Example 3 Instead of the aluminum foil, 10 aluminum powders containing 93% of aluminum powder having a particle size of 5 to 20 μm were used.
Example 1 was repeated except that 0 part by weight and 3 parts by weight of polyester resin were used.

The appearance of the surface of the obtained film is dark,
The gloss was significantly inferior to the printed matter of Example 1, and was also inferior to the printed matter of Comparative Example 1. Also, as in Comparative Example 2, the printability during gravure printing was poor, and the resistance of the printed ink layer was also poor.

Comparative Example 4 100 parts by weight of aluminum foil containing 87% of aluminum foil pieces having a thickness of 0.23 μm and a foil area of 20 to 2000 μm ² , 40 parts by weight of polyester resin, 800 parts by weight of ester solvent, ketone system Gravure printing was performed on the back surface of the transparent polyester film using an ink (viscosity 80 cps) containing 500 parts by weight of a solvent. Although the appearance of the surface of the obtained film had a mirror gloss, Example 1
The mirror surface glossiness of the

[0029]

As described above, according to the present invention, it is possible to produce an ink having a higher specular gloss and to provide an ink having excellent printability, and also to obtain a higher specular gloss. It is possible to provide a printed matter that is provided with and has excellent resistance of the ink layer.

Claims (5)

[Claims] 1. A foil having a thickness of less than 0.3 μm and a foil area of 20 μm.
m^Two~ 2000 μm ^Two80% of aluminum foil pieces that are
Triple layer for 100 parts by weight of aluminum foil
600 parts by weight or more and less than 15 parts by weight of binder and solvent
An ink comprising ~ 4000 parts by weight. 2. The foil area is less than 0.25 μm and the foil area is 20.
aluminum foil piece is from [mu] m ² a 2000 .mu.m ² 8
To 100 parts by weight of aluminum foil containing 6% or more,
3 parts by weight or more and less than 15 parts by weight of binder and solvent 6
An ink comprising from 0 to 4000 parts by weight. 3. A printed matter obtained by printing on a transparent substrate using the ink according to claim 1. 4. A printed matter obtained by performing printing and drying on a transparent substrate using the ink according to claim 1 or 2, and then performing overprinting on the printed ink using another type of ink. 5. The printed matter according to claim 3 or 4, wherein the surface opposite to the printed surface of the transparent substrate is viewed as the surface.