KR102638443B1 - Pigments, paints and printing elements - Google Patents

Abstract

The present invention provides a pigment capable of forming a surface layer capable of satisfactorily performing gradient printing on a printing substrate for gravure printing. The pigment of the present invention has inorganic fine particles and a coating layer formed on the surface of the inorganic fine particles and containing a metal oxide, and at a depth after sputtering for 1 second after the start of measurement by glow discharge luminescence spectrometry (GD-OES spectrometry). The luminescence intensity of Zn is 0.005 to 0.015, the luminescence intensity of Zn at a depth after sputtering for 5 seconds after the start of measurement is 0.003 to 0.013, and the average particle diameter is 50 to 300 nm.

Description

Pigments, paints and printing elements

The present invention relates to pigments, paints and printing elements.

Currently, medical drugs that require a doctor's prescription are prescribed in hospitals, dispensing pharmacies, etc. according to a pharmacist's prescription. When pharmacists identify medicines, they are often based on the printing done on the medicine packaging. Therefore, in the printing performed on the packaging of medical drugs, designs such as using various fonts, color shades, and designs are implemented so that they can be distinguished from other drugs.

However, the types of pharmaceuticals are increasing, and there are cases where the designs of pharmaceutical packaging are similar. Since variations in packaging design may lead to prescription errors, there is a desire to use gradient printing for printing packaging in order to diversify the design of pharmaceutical packaging.

On the other hand, for PTP packaging, it is mandatory to attach a barcode to the surface of the cover material to prevent prescription errors. Therefore, the surface of the cover material of most PTP packages is completely printed in white using white paint.

When gradient printing is performed on white plain printing, no problem occurs in deep-colored areas, but in light-colored areas (light areas) and especially in areas with slightly ink (highlight areas), ink is hardly transferred, making printing difficult. There is a problem in that a state (missing printing) occurs that is not implemented.

Therefore, Patent Document 1 proposes a gravure printing ink for surface printing containing an inert fine particle filler with an average particle diameter of 0.5 to 2.5 μm, a pigment, a binder resin, and a solvent.

Japanese Patent Publication No. 2009-114256

However, even if the above-described gravure printing ink for surface printing is used, there is a problem in that printing omission occurs in the light and highlight areas.

Therefore, as a result of various studies, the inventors found that the properties of the printing surface of the printing substrate on which gravure printing is performed affect gradient printing in the same way as gravure printing ink.

The present invention provides a pigment capable of forming a surface layer capable of satisfactorily performing gradient printing on a printing substrate for gravure printing, a paint using the same, and a printing member using the paint.

The pigment of the present invention has inorganic fine particles and a coating layer formed on the surface of the inorganic fine particles and containing a metal oxide, and at a depth after sputtering for 1 second after the start of measurement by glow discharge luminescence spectrometry (GD-OES spectrometry). The luminescence intensity of Zn is 0.005 to 0.015, the luminescence intensity of Zn at a depth after sputtering for 5 seconds after the start of measurement is 0.003 to 0.013, and the average particle diameter is 50 to 300 nm.

The paint containing the pigment of the present invention can form a surface layer suitable for gradient printing on the surface of a printing substrate subjected to gravure printing.

The surface layer formed using the paint of the present invention can reliably transfer the ink contained in the cells of the gravure printing roll to the surface layer of the printing member by bringing the surface layer, which is the printing surface of the printing member, into contact with the surface of the gravure printing roll. there is.

Therefore, when gradient printing is performed using gravure printing on the surface layer of a printing member formed using a paint containing the pigment of the present invention, beautiful printing is achieved both in the deep color area and the pale color area, especially in the light area and the highlight area. This can be done and beautiful gradient printing can be obtained.

Figure 1 is a cross-sectional view showing a printing substrate in which surface layers are laminated and integrated.
Figure 2 is a schematic diagram showing the method of performing gravure printing on the surface layer on a printing substrate.
Figure 3 is a cross-sectional view showing an example of a PTP package.

The pigment of the present invention has inorganic fine particles and a coating layer formed on the surface of the inorganic fine particles and containing a metal oxide, and at a depth after sputtering for 1 second after the start of measurement by glow discharge luminescence spectrometry (GD-OES spectrometry). The luminescence intensity of Zn is 0.005 to 0.015, the luminescence intensity of Zn at a depth after sputtering for 5 seconds after the start of measurement is 0.003 to 0.013, and the average particle diameter is 50 to 300 nm.

As for the inorganic fine particles, it is sufficient as long as the surface layer formed of a paint containing a pigment can form a printing surface on which gravure printing is performed. As for the inorganic fine particles, it is preferable that the surface layer formed by the paint is white.

Inorganic fine particles include, for example, silica fine particles, zinc oxide fine particles, titanium oxide fine particles, zirconium oxide fine particles, aluminum oxide fine particles, tin oxide fine particles, indium oxide fine particles, zirconium oxide fine particles, antimony oxide fine particles, magnesium oxide fine particles, or these as main components. Examples include composite oxide fine particles, calcium carbonate fine particles, talc, clay, calcined kaolin fine particles, calcined calcium silicate fine particles, aluminum silicate fine particles, magnesium silicate fine particles, calcium phosphate fine particles, etc., and titanium oxide fine particles are preferable. In addition, the inorganic fine particles may be used individually or two or more types may be used together.

A coating layer containing metal oxide is integrally provided on the surface of the inorganic fine particles. The coating layer may be formed on a portion of the surface of the inorganic fine particles, but is preferably formed on the entire surface of the inorganic fine particles.

The metal oxide constituting the coating layer is not particularly limited as long as it contains zinc oxide. Metal oxides other than zinc oxide include, for example, aluminum oxide (alumina), silica, zirconium oxide (zirconia), tin oxide, antimony oxide, etc., with zirconium oxide and silica being preferred. In addition, metal oxides may be used individually or two or more types may be used together.

The present invention has examined various metal oxides contained in the pigment coating layer, and has found that the distribution of the metal oxide content in the thickness direction of the coating layer affects the transferability of the ink stored in the cell of the gravure printing roll. was found out.

In the coating layer of the pigment, if the luminescence intensity of Zn at a predetermined depth from the surface of the pigment, that is, the Zn content (zinc oxide content) is within a predetermined range, although it has not been clearly elucidated, the coating film of the paint containing the pigment It has excellent surface smoothness and the transferability of ink within the cells of the gravure printing roll is improved. As a result, even when the opening area of the cells of the gravure printing roll is small, the ink in the cells of the gravure printing roll can be well transferred to the surface layer of the printing member, resulting in a clear gradation with almost no missing print in the light and highlight areas. You can get a print.

Specifically, when the pigment is analyzed by glow discharge luminescence analysis (GD-OES analysis), the luminescence intensity of Zn at the depth after sputtering for 1 second after the start of measurement is 0.005 to 0.015, preferably 0.008 to 0.010. . When the luminous intensity of Zn is 0.005 or more, the surface smoothness of the paint film (surface layer of the printing member) containing the pigment is excellent, the transferability of the ink in the cells of the gravure printing roll is improved, and as a result, the transferability of the ink in the cell of the gravure printing roll is improved. Even when the opening area of the cell is small, the ink in the cell of the gravure printing roll can be well transferred to the surface layer of the printing member, and clear gradient printing with almost no missing print in the light and highlight areas can be obtained. If the luminescence intensity of Zn is 0.015 or less, the whiteness of the paint film (surface layer of the printing member) containing the pigment becomes appropriate, and excellent gradient printing can be performed.

Additionally, when the pigment is analyzed by glow discharge luminescence spectrometry (GD-OES spectrometry), the luminescence intensity of Zn at the depth after sputtering for 5 seconds after the start of measurement is 0.003 to 0.013, preferably 0.006 to 0.010. When the luminous intensity of Zn is 0.003 or more, the surface smoothness of the paint film (surface layer of the printing member) containing the pigment is excellent, the transferability of the ink in the cells of the gravure printing roll is improved, and as a result, the transferability of the ink in the cell of the gravure printing roll is improved. Even when the opening area of the cell is small, the ink in the cell of the gravure printing roll can be well transferred to the surface layer of the printing member, and clear gradient printing with almost no missing print in the light and highlight areas can be obtained. If the luminescence intensity of Zn is 0.013 or less, the whiteness of the paint film (surface layer of the printing member) containing the pigment becomes appropriate, and excellent gradient printing can be performed.

When the pigment was analyzed by glow discharge luminescence spectrometry (GD-OES spectrometry), the luminescence intensity of Zn at the depth after sputtering for 1 second after the start of measurement showed that the paint film containing the pigment had superior surface smoothness, The transferability of the ink in the cells of the gravure printing roll is further improved, it can be better transferred to the surface layer of the printing member, and clearer gradient printing can be obtained, so the Zn at the depth after sputtering for 5 seconds after the start of measurement It is preferable that the luminous intensity is greater than .

In addition, when the coating layer contains zirconium oxide, when the pigment is analyzed by glow discharge luminescence analysis (GD-OES analysis), the luminescence intensity of Zr at the depth after sputtering for 1 second after the start of measurement is 0.065 to 0.090. is preferable, and 0.067 to 0.089 is more preferable. When the luminous intensity of Zr is 0.065 or more, the surface smoothness of the paint film (surface layer of the printing member) containing the pigment is excellent, the transferability of the ink in the cells of the gravure printing roll is improved, and as a result, the gravure printing roll has excellent surface smoothness. Even when the opening area of the cell is small, the ink in the cell of the gravure printing roll can be well transferred to the surface layer of the printing member, and clear gradient printing with almost no missing print in the light and highlight areas can be obtained. If the luminescence intensity of Zr is 0.090 or less, the whiteness of the paint film (surface layer of the printing member) containing the pigment becomes appropriate, and excellent gradient printing can be performed.

When the coating layer contains zirconium oxide, when the pigment is analyzed by glow discharge luminescence analysis (GD-OES analysis), the luminescence intensity of Zr at the depth after sputtering for 5 seconds after the start of measurement is preferably 0.050 to 0.075. And 0.051 to 0.075 is more preferable. When the luminous intensity of Zr is 0.050 or more, the surface smoothness of the paint film (surface layer of the printing member) containing the pigment is excellent, the transferability of the ink in the cells of the gravure printing roll is improved, and as a result, the gravure printing roll has excellent surface smoothness. Even when the opening area of the cell is small, the ink in the cell of the gravure printing roll can be well transferred to the surface layer of the printing member, and clear gradient printing with almost no missing print in the light and highlight areas can be obtained. If the luminescence intensity of Zr is 0.075 or less, the printing member having a surface layer including a coating film formed of a paint containing a pigment is preferable because blocking between the front and back surfaces of opposing printing members is well prevented even when in a wound state. .

When the pigment was analyzed by glow discharge luminescence spectrometry (GD-OES spectrometry), the luminescence intensity of Zr at the depth after sputtering for 1 second after the start of measurement showed that the paint film containing the pigment had superior surface smoothness, The transferability of the ink in the cells of the gravure printing roll is further improved, it can be better transferred to the surface layer of the printing member, and clearer gradient printing can be obtained, so the Zr at the depth after sputtering for 5 seconds after the start of measurement It is preferable that the luminous intensity is greater than .

When the coating layer contains silica, when the pigment is analyzed by glow discharge luminescence analysis (GD-OES analysis), the luminescence intensity of Si at the depth after sputtering for 1 second after the start of measurement is preferably 0.040 to 0.080. , 0.042 to 0.076 is more preferable. When the luminous intensity of Si is 0.040 or more, the surface smoothness of the paint film (surface layer of the printing member) containing the pigment is excellent, the transferability of the ink in the cells of the gravure printing roll is improved, and as a result, the gravure printing roll has excellent surface smoothness. Even when the opening area of the cell is small, the ink in the cell of the gravure printing roll can be well transferred to the surface layer of the printing member, and clear gradient printing with almost no missing print in the light and highlight areas can be obtained. If the luminous intensity of Si is 0.080 or less, the printing member having a surface layer including a coating film formed of a paint containing a pigment is preferable because blocking between the front and back surfaces of opposing printing members is well prevented even when in a wound state. .

When the coating layer contains silica, when the pigment is analyzed by glow discharge luminescence analysis (GD-OES analysis), the luminescence intensity of Si at the depth after sputtering for 5 seconds after the start of measurement is preferably 0.020 to 0.080. , 0.021 to 0.077 is more preferable, and 0.022 to 0.065 is particularly preferable. When the luminous intensity of Si is 0.020 or more, the surface smoothness of the paint film (surface layer of the printing member) containing the pigment is excellent, the transferability of the ink in the cells of the gravure printing roll is improved, and as a result, the gravure printing roll has excellent surface smoothness. Even when the opening area of the cell is small, the ink in the cell of the gravure printing roll can be well transferred to the surface layer of the printing member, and clear gradient printing with almost no missing print in the light and highlight areas can be obtained. If the luminous intensity of Si is 0.080 or less, the printing member having a surface layer including a coating film formed of a paint containing a pigment is preferable because blocking between the front and back surfaces of opposing printing members is well prevented even when in a wound state. .

When the pigment was analyzed by glow discharge luminescence spectrometry (GD-OES spectrometry), the luminescence intensity of Si at the depth after sputtering for 1 second after the start of measurement showed that the paint film containing the pigment had superior surface smoothness, The transferability of the ink in the cell of the gravure printing roll is further improved, it can be better transferred to the surface layer of the printing member, and clearer gradient printing can be obtained, so the Si at the depth after sputtering for 5 seconds after the start of measurement It is preferable that the luminous intensity is greater than .

Glow discharge luminescence analysis (GD-OES analysis) is an analysis method as described below. Argon ions generated by discharge under an argon atmosphere are incident on the surface of the sample serving as the cathode, causing a phenomenon called sputtering, and atoms, electrons, charged particles, etc. based on the constituent elements are emitted from the surface of the sample. Atoms emitted from the sample surface are excited by inelastic collisions with electrons during the glow discharge and emit light unique to the element. Elemental analysis is performed by dividing this light by wavelength using a spectroscope and measuring its intensity. By sequentially performing sputtering, element distribution in the depth direction from the sample surface can be measured.

Glow discharge luminescence spectrometry (GD-OES spectrometry) is measured, for example, under the following measurement conditions.

Device: Product name “JY-5000RF type GD-OES” manufactured by HORIBA

Gas for sputtering: Argon (Ar)

It is carried out by pulse method under the following conditions.

Frequency: 100Hz, Duty Cycle: 0.5, Pressure: 500Pa, Power: 30W

Module: 6.5V, Phase: 3.5V, Gas exchange time: 10 seconds

Pre-sputtering time: 10 seconds, target sample area: ϕ4mm

Background: 10 seconds, measurement time: 0 to 180 seconds

The average particle diameter of the pigment is 50 to 300 nm, preferably 100 to 300 nm, and more preferably 200 to 300 nm. It is preferable that the average particle diameter of the pigment is 50 nm or more because it becomes difficult for the pigment to aggregate. It is preferable that the average particle diameter of the pigment is 300 nm or less because the hiding property of the coating film of the paint containing the pigment is improved.

The average particle size of the pigment is measured using a laser diffraction/scattering particle size distribution meter. For example, using a laser diffraction/scattering particle size distribution meter sold under the trade name "LA-920" from Horiba Seisakusho, dispersion solvent: ethanol, circulation speed: 4, ultrasonic dispersion: volume average for 1 minute. The particle size is measured, and this volume average particle size is taken as the average particle size of the pigment.

A skin layer containing an organic compound may be integrally formed on the pigment coating layer. The skin layer may be partially formed on the surface of the inorganic fine particles, but is preferably formed on 90% or more of the surface area of the inorganic fine particles, and is formed on the entire surface of the inorganic fine particles (100% of the surface area of the inorganic fine particles). desirable. If a skin layer containing an organic compound is formed on the surface of the pigment, it has excellent affinity with the binder contained in the paint, and is finely dispersed without agglomerating in the paint. The pigment does not aggregate even in the surface layer formed by the paint. It is not distributed and is undispersed. Accordingly, the surface layer formed of the paint has excellent surface smoothness, and the ink in the cells of the gravure printing roll can be better transferred to the surface layer of the printing member, thereby obtaining vivid gradient printing.

The binder contained in the paint is not particularly limited, and examples include vinyl chloride resin, acrylic resin, alkyd resin, polyester resin, polyurethane resin, chlorinated polyolefin resin, and amorphous polyolefin resin.

As an organic compound, one containing fatty acid or polyol is preferable. As fatty acids, octanoic acid, nonanoic acid and decanoic acid are preferred. In addition, fatty acids may be used individually or two or more types may be used together.

The polyol is not particularly limited as long as it has a plurality of hydroxyl groups (-OH) in one molecule, but is selected from the group consisting of trimethylolpropane, trimethylolethane, ditrimethylolpropane, pentaerythritol, and trimethylolpropane ethoxylate. At least one alcohol is preferable, and at least one alcohol selected from the group consisting of trimethylolpropane, ditrimethylolpropane, and pentaerythritol is more preferable. In addition, polyol may be used individually or two or more types may be used together.

The paint contains the pigment and the binder. A solvent may be contained as needed to adjust the viscosity of the paint. Examples of solvents include methyl ethyl ketone, toluene, and ethyl acetate.

The pigment content in the paint is preferably 50 to 400 parts by mass, more preferably 100 to 300 parts by mass, and particularly preferably 100 to 150 parts by mass, relative to 100 parts by mass of the binder. If the pigment content in the paint is within the above range, the coating film formed from the paint has excellent surface smoothness and can smoothly transfer the ink in the cells of the gravure printing roll. Therefore, by gravure printing, it is possible to obtain precise gradient printing with precise light and highlight parts without print omission.

In paints, within the range that does not impair the physical properties, ultraviolet absorbers, light stabilizers, antioxidants, thermal polymerization inhibitors, leveling agents, anti-foaming agents, thickeners, anti-settling agents, infrared absorbers, fluorescent whitening agents, dispersants, conductive fine particles, and antistatic agents. , additives such as antifogging agents and coupling agents may be contained.

The paint is applied to one side of the printing substrate and used to form a surface layer. A film of the paint is formed on the surface of the printing substrate to which the paint is applied, and this film forms a surface layer (printing base) that becomes the printing surface.

The paint is applied to the surface of the printing substrate 1 on which gravure printing is performed and then dried as necessary to form a coating film, and this coating film constitutes the surface layer 2. The surface layer 2 formed on the printing substrate 1 serves as a printing surface for performing gravure printing (see Fig. 1).

The printing substrate 1 is not particularly limited as long as it is a conventionally known substrate on which gravure printing is performed, and examples include metal foil such as aluminum foil, synthetic resin film, and paper.

The printing substrate 1 on which the surface layer 2 is formed facilitates the separation of ink stored in the cells of the gravure printing roll. Therefore, in the gravure printing roll, although the cells of the gravure printing roll corresponding to the light portion and especially the highlight portion have a small opening area, ink can easily escape from these cells, and thus the cells of the gravure printing roll corresponding to the light portion and especially the highlight portion are small. Even in parts, it is possible to form beautiful gradient printing without missing prints.

In detail, when performing gravure printing on the printing substrate 1, the printing substrate 1 is placed between the gravure printing roll 3 and the backup roll 4 opposing the gravure printing roll 3 as a surface layer ( 2) is supplied facing the gravure printing roll 3, the surface layer 2 on the printing substrate 1 is pressed against the surface of the gravure printing roll 3 by the backup roll 4, and the gravure printing roll The printing substrate 1 is separated from the surface of the gravure printing roll 3 while transferring the ink C stored in the cell 31 of (3) to the surface layer 2 on the printing substrate 1. Gravure printing is performed on the surface of (1).

When the surface layer 2 on the printing substrate 1 is pressed against the surface of the gravure printing roll 3, the surface layer 2 has excellent surface smoothness, so the ink C in the cells 31 is pressed against the surface layer 2. It is transferred to the side with high precision, and printing corresponding to the shape of the cell 31 of the gravure printing roll 3 is performed on the surface layer 2.

As described above, the shape of the cells 31 of the gravure printing roll 3 is such that the ink C in the cells 31 of the gravure printing roll 3 is transferred with high precision and ease onto the surface layer 2. Even if (the opening of the cell 31) is fine, the ink C in the cell 31 is accurately transferred onto the surface layer 2. Therefore, the printing substrate 1 on which the surface layer 2 is formed can be suitably used for gradient printing by gravure printing.

And the printing member including the printing substrate 1 and the surface layer 2 laminated and integrated on the surface of the printing substrate 1 can be suitably used as a sealing sheet of a PTP package (press-through package). Specifically, as shown in FIG. 3, the PTP package 5 includes a storage sheet 51 having a plurality of tablet storage portions 51a for storing tablets B, and a storage sheet 51. It has a sealing sheet 52 that closes the opening of the tablet storage portion 51a. Tablets (B) include drugs having a certain shape and also include capsules and the like. By pressing the tablet storage portion 51a of the storage sheet 51 against the sealing sheet 52 side, the sealing sheet 52 is split, and the tablet B stored in the tablet storage portion 51a can be taken out. .

The storage sheet 51 is generally formed in a flat rectangular shape, and a plurality of tablet storage portions 51a are formed by partially expanding a known synthetic resin sheet using a general-purpose thermoforming method. In addition, examples of the synthetic resin constituting the synthetic resin sheet include polyester resins such as polyethylene terephthalate sheets, polyvinyl chloride resins such as polyvinyl chloride, and polystyrene resins. Examples of thermoforming methods include vacuum forming methods and pressure forming methods.

As shown in FIG. 3, the surface 51b of the storage sheet 51 where the opening of the tablet storage portion 51a is formed is provided with a sealing sheet to close the opening of the tablet storage portion 51a. (52) is laminated and integrated.

The sealing sheet 52 has a printing member A and a gravure printing layer 53 integrally formed on the surface layer 2 of the printing member A. The printing member A has a printing substrate 1 and a surface layer 2 formed on the printing substrate 1. The surface layer 2 contains a film of the above-mentioned paint. The gravure printing layer 53 is formed by printing on the surface layer 2 by gravure printing and includes gradient printing. Additionally, in Fig. 3, the PTP package is shown with the gravure printed layer 53 exposed to the outside, but the gravure printed layer 53 may be placed on the inside (toward the storage sheet 51).

Gradient printing printed on the surface layer (2) of the printing member (A) produces beautiful and precise printing with no print omission even in the light and highlight areas, and various designs can be given to the PTP package (5). there is.

<Example>

Hereinafter, the present invention will be described in more detail using examples, but the present invention is not limited to these examples.

(Examples 1 to 6 and Comparative Examples 1 and 2)

A coating layer containing zinc oxide, zirconium oxide and silica is formed entirely and integrally on the surface of titanium oxide fine particles, and a skin layer containing an organic compound shown in Table 1 is formed entirely and integrally on the coating layer. The pigment was prepared. The average particle size of the pigment is shown in Table 1.

For pigments, the luminescence intensities of Zn, Zr, and Si at the depth after sputtering for 1 second after the start of measurement by glow discharge luminescence spectrometry (GD-OES spectrometry) are shown in the “After 1 second” column in Table 1.

For pigments, the luminescence intensities of Zn, Zr, and Si at the depth after sputtering for 5 seconds after the start of measurement by glow discharge luminescence spectrometry (GD-OES spectrometry) are shown in the “After 5 seconds” column in Table 1.

As a binder, 15% by mass of vinyl chloride-vinyl acetate-fumaric acid copolymer (vinyl chloride component: 84% by mass, vinyl acetate component: 15% by mass, fumaric acid component: 1% by mass), 20% by mass of the pigment, and as a solvent. A paint was produced by uniformly mixing methyl ethyl ketone to 65% by mass.

An aluminum foil with a thickness of 20 μm was prepared as a printing substrate, paint was applied to one side of the aluminum foil, dried, and a surface layer was formed on one side of the aluminum foil to produce a printing member.

As ink, red ink (product name "MBA Golden Red A" manufactured by Fuji Ink Kogyo), indigo ink (product name "MBA Primary Color Nam A" manufactured by Fuji Ink Kogyo), full color ink (product name "MBANo.1 Paste A" manufactured by Fuji Ink Kogyo) , brown ink (trade name “MBA No.3 Brown A” manufactured by Fuji Ink Industries) and pink ink (trade name “MBA Pink A” manufactured by Fuji Ink Industries) were prepared.

A gravure printing roll having cells with opening areas of 25 ㎛ ² , 15 ㎛ ² , 5.0 ㎛ ² or 2.5 ㎛ ² was prepared. Additionally, a cell with an opening area of 5.0 μm ² corresponds to a cell forming the light portion of gradient printing. A cell with an opening area of 2.5 μm ² corresponds to a cell forming the highlight portion of gradient printing.

A gravure printing layer was formed on the surface layer 2 of the printing member by gravure printing using the ink and the gravure printing roll.

For the obtained gravure print, transferability was measured in the following manner, and the results are shown in Tables 2 and 3.

(transferability)

A microscopic photograph of the gravure printing layer formed on the surface layer of the printing member was taken at a magnification of 200 times. In the micrograph, a measurement section in the shape of a flat square with one side of 1 mm (actual size) was arbitrarily determined, and the number of printed dots (number of prints) in the measurement section was measured. Additionally, the number of cells of the gravure printing roll in contact with the measurement section was measured. The transcription rate was calculated based on the following equation. The transcription rate was evaluated based on the following criteria. In addition, the number of prints and the number of cells of the gravure printing roll were counted only for those that completely entered the measurement section.

Transfer rate (%) = 100 × number of prints / number of cells

A… The transfer rate was over 95%.

B… The transfer rate was more than 90% and less than 95%.

C… The transfer rate was more than 70% and less than 90%.

D… The transcription rate was less than 70%.

According to the printing substrate having a surface layer formed using a paint containing the pigment of the present invention, precise gradient printing can be performed on the surface layer by gravure printing. The paint and printing member of the present invention can be suitably used for pharmaceutical packaging such as PTP packaging.

Printing with various designs can be performed on the surface layer of the printing member constituting the sealing sheet of the PTP package, and various designs can be given to the PTP package. Therefore, the pharmacist can easily identify the PTP package and effectively prevent prescription errors.

(Cross-reference to related applications)

This application claims priority based on Japanese Patent Application No. 2017-194687, filed on October 4, 2017, the disclosure of which is hereby incorporated by reference in its entirety.

1: Printing substrate
2: Surface layer
3: Gravure printing roll
4: Backup roll
5: PTP package
51: storage sheet
51a: tablet storage unit
52: sealing sheet
53: Gravure printing layer
A: Print member
B: Tablets

Claims (5)

Inorganic fine particles containing titanium oxide fine particles, a coating layer formed on the surface of the inorganic fine particles and containing a metal oxide containing zinc oxide, zirconium oxide, and silica, and integrally formed on the coating layer and further containing a fatty acid or polyol It consists only of a skin layer containing an organic compound containing, and the luminescence intensity of Zn at the depth after sputtering for 1 second after the start of measurement by glow discharge luminescence spectrometry (GD-OES spectrometry) is 0.005 to 0.015, and the measurement is started. The luminescence intensity of Zn at a depth after sputtering for 5 seconds is 0.003 to 0.013, and the luminescence intensity of Zn at a depth after sputtering for 1 second after the start of the measurement is the depth after sputtering for 5 seconds after the start of the measurement. is greater than the luminescence intensity of Zn in and has an average particle diameter of 50 to 300 nm,
The luminescence intensity of Zr at the depth after sputtering for 1 second after the start of measurement by glow discharge luminescence analysis (GD-OES analysis method) is 0.067 to 0.089, and the luminescence intensity of Zr at the depth after sputtering for 5 seconds after the start of measurement The intensity is 0.051 to 0.075,
The luminescence intensity of Si at a depth after sputtering for 1 second after the start of measurement by glow discharge luminescence analysis (GD-OES analysis method) is 0.040 to 0.080, and the luminescence intensity of Si at a depth after sputtering for 5 seconds after the start of measurement is 0.040 to 0.080. Pigment characterized in that the intensity is 0.020 to 0.080. A paint for forming a surface layer serving as a printing surface on a printing substrate for gravure printing, wherein the paint contains the pigment according to claim 1. A printing member for gravure printing, comprising a printing substrate and a surface layer that is laminated and integrated on the surface of the printing substrate and includes a coating film of the paint according to claim 2. delete delete