JP2000109738A - Printing ink and formation of image using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a printing ink capable of inhibiting the transfer of the ink in albums after printed or in books piled on the front of a shop, and to provide a method for forming an image by the use of the ink. SOLUTION: This printing ink contains a silicone oil. Therein, the silicone oil is at least one oil selected from mercapto-modified silicone oils, phenol- modified silicone oils, carboxy-modified silicone oils, amino-modified silicone oils and long chain alkyl-modified silicone oils. The content of the silicone oil is preferably 0.05-5.0 pts.wt. per 100 pts.wt. of the printing ink. The printing ink is printed on a printing sheet comprising a sheet-like support and an electron beam-cured resin coating layer formed on at least one surface of the sheet-like support.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an image forming method and a printing ink used therefor. More specifically, the present invention relates to an album or book cover in which glossy surfaces after printing are in direct contact with each other, The present invention relates to a printing ink used for bags, folded prints, and the like, and a method for forming an image of a sheet for high gloss printing using the printing ink.

[0002]

2. Description of the Related Art Conventionally, gloss coated paper called cast coated paper has a coating layer mainly composed of a pigment and an adhesive,
While it is in a plastic state containing water, it is pressed against the heated mirror surface and provided with a high gloss coating layer formed by drying and finishing, but the glossiness as a high gloss coating paper is It is not satisfactory and a higher gloss is desired.

[0003] In order to solve this problem, a press coating method in which a clear lacquer-like paint is applied to the surface of a printed material and dried, or a molten resin is laminated on a sheet-like support in the form of a film to obtain a smooth, high-gloss luster. A so-called laminate coating system has been used in which a metal cylindrical rotary member is pressed against and cooled, and after cooling, peels off from the metal cylindrical rotary member to form a high gloss coating layer. However, in these methods, after printing, an additional step of overcoating is added, so that not only is the number of steps disadvantageous in terms of cost, but also the yield is reduced, and the quality such as gloss cannot be sufficiently satisfied. .

[0004] In recent years, a coating liquid layer formed from a coating composition containing an electron beam-curable organic compound as a main component (hereinafter referred to as an electron beam-curable resin composition) has recently been used to form a coating liquid layer on the surface of a molding substrate or metal. A cast electron beam irradiation method in which the sheet is pressed against a cylindrical rotating body and irradiated with an electron beam to cure the sheet is performed, and a printing sheet having a high glossiness can be obtained by these methods.

[0005] Although the electron beam-curable resin coating layer forming these printing sheets may be a single layer, it produces a high gloss printing sheet having good ink setting properties, flexibility, surface whiteness and aesthetics. In this case, the electron beam-curable resin coating layer may have a structure of two or more layers, and the inner resin coating layer and the outer resin coating layer may be formed into a multilayer structure using different electron beam-curable resin compositions.

However, a sheet for high gloss printing having such an electron beam curable resin coating layer on the surface of a sheet-like support is used in such a manner that the glossy surfaces after printing are in direct contact with each other, for example, album paper, In the case of a book cover, a folded product, or the like, there has been a problem that a so-called ink transfer phenomenon occurs in which the printing ink is transferred onto the opposite glossy surface. As a means for solving this problem, the use of carton ink, synthetic paper ink, or UV ink has been attempted, but the effect of preventing ink transfer is not sufficient, and it is not satisfactory, such as a decrease in gloss after printing. Did not.

[0007]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and a printing ink for suppressing ink transfer of an album after bookbinding or a book superimposed at a store, and an image forming method using the same. It is intended to provide.

[0008]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that a printing ink used when printing a high gloss printing sheet having an electron beam curable resin coating layer has a specific structure. The present inventors have found that the addition of silicone oil suppresses ink transfer when the glossy surfaces are in direct contact with each other, and have completed the present invention. Further, it has been found that, depending on the type of the silicone oil used in the present invention, the gloss of the printed surface, which is usually reduced, may be increased.

[0009] The printing ink according to the present invention contains a silicone oil, which is composed of mercapto-modified silicone oil, phenol-modified silicone oil, carboxy-modified silicone oil, amino-modified silicone oil, and long-chain alkyl-modified silicone oil. It is characterized by being at least one selected. Further, the content of the silicone oil is preferably 0.05 to 5.0 parts by weight based on 100 parts by weight of the printing ink.

[0010] The image forming method according to the present invention comprises printing on a printing sheet having a sheet-like support and an electron beam-curable resin coating layer formed on at least one surface thereof using the printing ink. It is a feature.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION As the silicone oil to be added to a printing ink used for printing a printing sheet having an electron beam-curable resin coating layer of the present invention, mercapto-modified silicone, phenol-modified silicone, carboxy-modified silicone, The structure, molecular weight and the like are not particularly limited as long as they are selected from amino-modified silicone or long-chain alkyl-modified silicone.

The amount of the silicone oil to be blended into the printing ink of the present invention may be 0.05 to 5.0 parts by weight based on 100 parts by weight of the printing ink. If the amount is less than 0.05 parts by weight, the effect of preventing ink transfer may not be sufficiently exhibited. 5.0
When the amount is more than the weight part, the ink gloss after printing is reduced, or the adhesion to the printing sheet is reduced,
The viscosity as a printing ink may decrease, which is not preferable. However, when a high ink gloss is not required, it is not a problem to add more than 5.0 parts by weight.

Although the type of the printing ink of the present invention is not particularly limited, a process ink used for lithographic printing of a single sheet is advantageously used. others,
Use of letterpress ink, rotary printing ink, gravure ink, etc. may be used at all.

The method for kneading the silicone oil used in the present invention with the printing ink is not particularly limited, but any method used for ordinary kneading can be used. For example, a biaxial disperser, a three-roll mill (three-roll mill), a two-roll mill (two-roll mill), a cowles dissolver, a homomixer, a sand grinder, a planetary mixer, an ultrasonic disperser, and the like can be used.

The method of adding the silicone oil used in the present invention to the printing ink is not particularly limited in the order of addition, but the usual ink manufacturing process, that is, mixing the vehicle and the pigment is carried out. , Dispersant,
It is common practice to add known various auxiliaries such as a release agent, an antifoaming agent, a colorant, a dye, a preservative, and the like, and to finally incorporate the auxiliaries into the finished printing ink.

The printing sheet to be printed with the printing ink of the present invention is not particularly limited as long as it has a sheet-like support and an electron beam-curable resin coating layer formed on at least one surface thereof. JP-A-8-218295, JP-A-8-284095, JP-A-8-311
798, JP-A-9-78493, JP-A-9-78493
Preferred are those disclosed in, for example, JP-A-176992 and JP-A-9-176993.

The image forming method according to the present invention comprises a relief printing method,
There is an intaglio printing system or a lithographic printing system, and it is not particularly limited. However, it is preferable to perform printing using a printing ink of the present invention using a normal lithographic printing machine.

[0018]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples, but the present invention is not limited to these.

The high gloss printing sheet to be printed with the silicone-containing printing ink of the present invention was prepared by the following method. Composition 1 Component Compounding amount Polyether urethane acrylate 50 parts by weight (trademark: KU511-23, manufactured by Arakawa Chemical Industries) 1,9 Nonanediol diacrylate 40 parts by weight (trademark: New Frontier L-C9A, Daiichi Kogyo Co., Ltd.) 10 parts by weight of titanium dioxide (trademark: R-23, manufactured by Sakai Chemical)

A composition 1 for forming a sheet for high gloss printing was coated on a surface of a sheet-like support made of a coated paper having a basis weight of 127.9 g / m ² (trade name: OK Top Coat Dal, manufactured by Oji Paper Co., Ltd.). Using a bar, coating was performed so that the coating amount after curing was 15 g / m ² , and a polyester film was overlaid thereon. Then, an acceleration voltage of 175 kV was applied to the multilayer body from the back of the polyester film.
The electron beam was irradiated under the conditions of V, an absorbed dose of 2 Mrad, and an oxygen concentration of 500 ppm or less. Thereafter, the polyester film was peeled off from the resin coating layer to obtain a high gloss printing sheet having an electron beam curing resin coating layer.

Example 1 A printing ink used in the present invention was prepared by the following method. Ink composition 1 Sheet-fed printing process ink 100.0 parts by weight (trademark: GEOS-G black, manufactured by Dainippon Ink and Chemicals, Inc.) Mercapto-modified silicone 0.5 part by weight (trademark: BY24-551A, Toray Dow Corning Silicone) Company)

[0022] printing a little gloss on the glossy surface of the printing sheet, printability tester (RI
-1 type tester: manufactured by Ishikawajima Sangyo Kikai Co., Ltd.) using the printing ink of Ink Composition 1. For printing, 0.5 g of a printing ink was placed on a kneading roll, and solid printing was performed.

[0023]Evaluation Print surface glossiness Printed matter printed by the above method is humidity controlled at 20 ° C and 65%
Dry under the conditions for 3 days, according to JIS Z-8741
Using a gloss meter (Type 26D: Murakami Color Research Laboratory)
The gloss (60 °) was measured. Table 1 shows the measurement results.
Was. Ink transfer After printing, after drying for 24 hours, print separately prepared
The high gloss printing sheet that is not in contact with the glossy surface
And stick them together. At this time, strong gloss printing that has not been printed
Sheet for bonding using the Meyer bar on the back side
Glue (Kanebinol TV-942: manufactured by NSC Japan)
20g / m^TwoAnd apply it to the back of another high gloss printing sheet.
Use the one that is pasted. The overlay obtained in this way
The sample is placed on a press (Labo Press: Kumagaya Rikisha)
5 kg / cm^TwoPressure for 15 minutes
After laminating, release the pressure and then 100g /
cm ^Two3 days at 40 ° C and 90% RH
After leaving for a while, peel off and visually check the amount of ink transferred to the blank paper side.
And evaluated. The evaluation criteria are that no metastasis has occurred.
○ indicates that the degree of metastasis is mild,
Those with a severe degree were marked as x. Metastasis has occurred slightly
○ is acceptable, △ and × are unacceptable
And Table 1 shows the evaluation results. Ink transferability Observe the surface of the printed surface visually when printing, and
Control the transfer of ink from the printer to the sheet surface for high gloss printing.
Performance was evaluated. Good transfer and high density were indicated by ○,
Insufficient transfer due to inking and low density
Was rated x.

Example 2 The same operation as in Example 1 was performed. However, ink composition 1
The following ink composition 2 was prepared in place of and used. Ink Composition 2 Process ink for sheet-fed printing 100.0 parts by weight (trademark: GEOS-G black, manufactured by Dainippon Ink and Chemicals, Inc.) 4.5 parts by weight mercapto-modified silicone (trademark: BY24-551A, Toray Dow Corning Silicone) (Manufactured by the company). Table 1 shows the evaluation results.

Example 3 The same operation as in Example 1 was performed. However, ink composition 1
The following ink composition 3 was prepared in place of and used.
Ink composition 3 Sheet-fed process ink 100.0 parts by weight (trademark: GEOS-G black, manufactured by Dainippon Ink and Chemicals, Inc.) mercapto-modified silicone 0.05 part by weight (trademark: BY24-551A, Toray Dow Corning Silicone) (Manufactured by the company). Table 1 shows the evaluation results.

Example 4 The same operation as in Example 1 was performed. However, ink composition 1
Was replaced with the following ink composition 4, which was used. Ink composition 4 Process ink for sheet-fed printing 100.0 parts by weight (trademark: GEOS-G black, manufactured by Dainippon Ink and Chemicals, Inc.) Phenol-modified silicone 0.5 part by weight (trademark: BY16-752, Toray Dow Corning Silicone) (Manufactured by the company). Table 1 shows the evaluation results.

Example 5 The same operation as in Example 1 was performed. However, ink composition 1
The following ink composition 5 was prepared in place of and used. Ink composition 5 Sheet-fed printing process ink 100.0 parts by weight (trademark: GEOS-G black, manufactured by Dainippon Ink and Chemicals, Inc.) 0.5 parts by weight of carboxy-modified silicone (trademark: BY16-750, Toray Dow Corning Silicone) (Manufactured by the company). Table 1 shows the evaluation results.

Example 6 The same operation as in Example 1 was performed. However, ink composition 1
The following ink composition 6 was prepared in place of and used. Ink composition 6 Sheet-fed printing process ink 100.0 parts by weight (trademark: GEOS-G black, manufactured by Dainippon Ink and Chemicals, Inc.) 0.5 parts by weight alcohol-modified silicone (trademark: BY16-843, Toray Dow Corning Silicone) (Manufactured by the company). Table 1 shows the evaluation results.

Example 7 The same operation as in Example 1 was performed. However, ink composition 1
The following ink composition 7 was prepared in place of and used. Ink composition 7 Sheet-fed printing process ink 100.0 parts by weight (trademark: GEOS-G black, manufactured by Dainippon Ink and Chemicals, Inc.) Amino-modified silicone 0.5 part by weight (trademark: BY16-853, Toray Dow Corning Silicone) (Manufactured by the company). Table 1 shows the evaluation results.

Example 8 The same operation as in Example 1 was performed. However, ink composition 1
Was replaced with the following ink composition 8, which was used. Ink composition 8 Process ink for sheet-fed printing 100.0 parts by weight (trademark: GEOS-G black, manufactured by Dainippon Ink and Chemicals, Inc.) 0.5 part by weight of long-chain alkyl-modified silicone (trademark: SF-8416, Toray Dow) (Corning Silicone Co., Ltd.) Evaluation was performed in the same manner as in Example 1. Table 1 shows the evaluation results.

Comparative Example 1 The same operation as in Example 1 was performed, except that an ink containing no silicone (GEOS-G black) was used instead of the ink composition 1. Evaluation was performed in the same manner as in Example 1. Table 1 shows the evaluation results.

Comparative Example 2 The same operation as in Example 1 was performed. However, ink composition 1
Was used in place of the following ink composition 9. Ink composition 9 Sheet-fed printing process ink 100.0 parts by weight (trademark: GEOS-G black, manufactured by Dainippon Ink and Chemicals, Inc.) 0.5 parts by weight of polyether-modified silicone (trademark: SF-8427, Toray Dow Corning) Evaluation was made in the same manner as in Example 1. Table 1 shows the evaluation results.

Comparative Example 3 The same operation as in Example 1 was performed. However, ink composition 1
Was used in place of the following ink composition 10. Ink composition 10 Sheet-fed printing process ink 100.0 parts by weight (trademark: GEOS-G black, manufactured by Dainippon Ink and Chemicals, Inc.) Mercapto-modified silicone 10.0 parts by weight (trademark: BY24-551A, Toray Dow Corning Silicone) (Manufactured by the company). Table 1 shows the evaluation results.

[0034]

[Table 1]

As shown in Table 1, the high gloss printing sheets (Examples 1 to 8) printed with the printing inks containing the silicone oil according to the present invention in an appropriate amount (Examples 1 to 8) have excellent ink transfer prevention properties and The subsequent ink gloss is high and the printability is excellent. On the other hand, when a printing ink containing no silicone having an ink transfer preventing effect is used (Comparative Example 1).
If the amount of silicone is small, or if another type of silicone oil is added (Comparative Example 2),
When the occurrence of ink transfer cannot be suppressed, and when the amount of the silicone for preventing ink transfer is large (Comparative Example 3)
The ink gloss after printing was low, resulting in poor printability.

[0036]

EFFECTS OF THE INVENTION A high gloss printing sheet formed with an image using the printing ink of the present invention suppresses ink transfer of a book when stacked in an album or a store after bookbinding, and is extremely useful in practice. .

Claims (3)

[Claims] 1. A printing ink containing silicone oil, wherein the silicone oil is a mercapto-modified silicone oil, a phenol-modified silicone oil,
A printing ink, which is at least one selected from carboxy-modified silicone oil, amino-modified silicone oil, and long-chain alkyl-modified silicone oil. 2. The printing ink according to claim 1, wherein the content of the silicone oil is 0.05 to 5.0 parts by weight based on 100 parts by weight of the printing ink. 3. An image forming method, comprising printing on a printing sheet having a sheet-like support and an electron beam-curable resin coating layer formed on at least one surface thereof, using the printing ink.