JP2010229302A - Overprint varnish composition for offset, and printed matter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat set type overprint varnish composition for offset, excellent in mat effect, abrasion resistance and emulsion flowability while considering global environment. <P>SOLUTION: The overprint varnish composition for the offset, containing silica, a highly reactive metal organic compound, a binder resin, plant oils and a petroleum-based solvent is characterized in that the silica has 0.05 to 5 μm mean particle diameter, and 50 to 400 m<SP>2</SP>/g BET specific surface area, and the highly reactive metal organic compound is contained by 3 to 20 wt.% of the total amount of the silica. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an offset overprint varnish composition excellent in matte feeling, friction resistance, and emulsification fluidity while considering the global environment.

Heat set type offset printing is a printing ink color (yellow, red, indigo, black, etc.), then passed through a hot air dryer to promote solvent removal from the ink transferred to the paper surface by heat, This is a printing method for drying and film formation.
Usually, the overprint varnish composition for heatset offset is printed on the surface after printing each color of printing ink, and for printed matter such as calendars, posters, catalogs, etc., printing surface protection, unevenness due to matte printing surface, It is used when providing a three-dimensional effect, matte tone, tactile effect, and the like.

  Of the overprint varnish composition for offset, a varnish for imparting a matting effect is generally composed of a matting agent, a binder resin, a vegetable oil, and a solvent as main components. The matting agent is a fine particle aggregate of inorganic or organic materials for generally obtaining a matte effect on the printing surface. The matting agents form a structure in the varnish printed on the paper surface, and are dried and thinned while maintaining the structure, whereby irregularities are formed on the surface, and a matte effect appears on the printed surface.

Conventionally, polyvinyl chloride resins, silica, calcium carbonate, and the like have been mainly used as matting agents for offset overprint varnish compositions. Among them, polyvinyl chloride resins having high matting effect and good emulsification performance are becoming mainstream matting agents.
On the other hand, the offset ink industry has been working to reduce the burden on the global environment, and it is desirable that the materials used should not generate harmful gases when incinerated. There is also experimental data that the amount of dioxin generated is generally proportional to the amount of chlorine during print incineration, and prints using polyvinyl chloride resin as a matting agent may generate dioxins and other harmful gases during incineration. Is not preferable from the viewpoint of reducing environmental impact.

  For the purpose of reducing the environmental burden, overprint varnish compositions for offsets mainly composed of silica or calcium carbonate have been studied. There are two main types of silica, dry process silica and wet process silica, due to differences in their production methods. Dry process silica is bulky compared to wet process silica and has fewer silanol groups. Since the efficiency is inferior and the matting effect is weak, wet process silica is mainly used as a matting agent. When wet method silica is used as the main component of the matting agent, there are many surface silanol groups compared to dry method silica, and when emulsified, the fluidity is remarkably easily lost, and the emulsified varnish can be Problems such as easy transfer failure due to the roller feeling occur.

  In addition, when calcium carbonate is used as the main component of the matting agent, calcium carbonate has a weak matting effect, so the content must be significantly increased compared to polyvinyl chloride resin, and the dispersibility in the manufacturing process must be increased. Problems such as increased load such as deterioration and plate wear during printing are caused.

  In addition, fine particle aggregates used as matting agents have been widely studied in the past. For example, examples of the inorganic material include porous alumina described in Patent Document 1, titanium oxide porous material described in Patent Document 2, porous calcium carbonate of Patent Document 3, and the like. However, it takes time and effort for processing and is not practical because of its high cost. Furthermore, it has a poor matting effect in offset printing applications.

  In addition, as an organic material, Patent Document 4 mentions an aggregate of crosslinked polymer fine particles, but the average particle diameter is preferably described as being in the range of 5 to 100 μm, and the film thickness is 5 μm or less. In offset printing, the inclusion of a matting agent having an average particle size larger than the film thickness is not preferred because it tends to cause problems such as piling. Further, as disclosed in Patent Document 5, an organic material mat is used. As the agent, vinyl halide compounds are often used, which is not preferable in terms of reducing environmental burden.

Japanese Patent Laid-Open No. 10-231119 Japanese Patent Laid-Open No. 10-259023 Japanese Patent Laid-Open No. 10-182491 JP 2001-81335 A JP 2001-89689 A

  An object of the present invention is to provide a heat-set offset overprint varnish composition excellent in mat effect, friction resistance, and emulsification fluidity in consideration of the global environment.

  As a result of sincere research to solve the above problems, in an overprint varnish composition for offset containing silica, binder resin, vegetable oil and solvent, by adding a specific amount of a specific highly reactive metal organic compound to silica It has been found that the emulsification fluidity is greatly improved, and the present invention has been completed.

That is, the present invention provides an offset overprint varnish composition containing silica, a highly reactive metal organic compound, a binder resin, a vegetable oil, and a petroleum solvent.
Silica has an average particle size of 0.05 to 5 μm
and
The BET specific surface area is 50 to 400 m ² / g,
Highly reactive metal organic compound is 3 to 20% by weight of the total amount of silica
It is related with the overprint varnish composition for offsets characterized by being contained.

  Furthermore, the present invention relates to the offset overprint varnish composition described above, wherein the silica is wet silica and is contained in an amount of 5 to 30% by weight of the total amount of varnish.

  In the present invention, the polytetrafluoroethylene having an average particle size of 0.05 to 5 μm is contained in the offset overprint varnish composition in an amount of 2 to 15% by weight based on the total amount of the varnish. The present invention relates to an offset overprint varnish composition.

  Furthermore, the present invention relates to an offset overprint varnish composition, wherein the offset overprint varnish composition is a heat set type.

  The present invention also relates to an offset ink comprising the above-described offset overprint varnish composition in an amount of 5 to 30% by weight based on the total amount of the ink.

  Furthermore, the present invention relates to a laminate obtained by printing the above offset ink on a substrate.

  The present invention also relates to a laminate comprising the above-described offset overprint varnish composition printed on a substrate.

  Furthermore, the present invention relates to the above laminate, wherein the substrate is a printed material.

  The overset varnish composition for offset, which is a heat set type of the present invention that imparts printing surface protection and matting effect to printed materials such as calendars, posters, catalogs, etc., has matte feeling, friction resistance, and emulsification fluidity. Excellent and less environmental impact.

  Next, the present invention will be described more specifically with reference to preferred embodiments.

  Silica is divided into dry silica and wet silica depending on the production method. Dry method silica refers to those produced by burning silicon tetrachloride gas in the gas phase, and wet method silica refers to those produced by neutralization or decomposition reaction of sodium silicate aqueous solution with acid or alkali metal salt. .

  The dry process silica is bulky compared to the wet process silica, has poor work efficiency in preparation for mat varnish production, and further has a weak matting effect, so that the silica used as the matting agent is preferably a wet process silica. Moreover, in the wet process silica, precipitation process silica, gel process silica, etc. are mentioned from the difference in the production process, but any production process may be used as long as the physical property range of claim 1 is satisfied.

  The silica in the present invention has an average particle size of 0.05 to 5 μm, preferably 0.1 to 4 μm, and more preferably 0.3 to 3 μm. When the average particle size is less than 0.05 μm, the effect of forming irregularities when the silica particles form a structure on the surface is weak, so that the matte effect is inferior. On the other hand, if the average particle size is larger than 5 μm, the pile during printing and the plate wear resistance are inferior. The silica content in the present invention is 5 to 30% by weight, preferably 7 to 25%, and more preferably 10 to 20%. If the silica content is less than 5% by weight, the required matting effect cannot be obtained even if the amount of varnish is increased at the time of printing, and if it is more than 30% by weight, the emulsified fluidity due to the addition of a highly reactive metal organic compound. In addition, the high-reactive metal organic compound must be used in a large amount, resulting in deterioration of the emulsification performance.

Furthermore, the silica of the present invention, BET specific surface area of 50 to 400 m ² / g, preferably 80~300m ² / g, further preferably at 100 to 250 m ² / g. When the BET specific surface area is less than 50 m ² / g, it is difficult to obtain the viscoelasticity required for the offset overprint varnish, and there is a concern that problems such as piling are likely to occur due to the relatively large particle size. On the other hand, if the BET specific surface area is larger than 400 m ² / g, the cohesive force between the primary particles of silica becomes too strong, and the load in the dispersion process becomes large, resulting in problems such as poor dispersion and deterioration of plate wear. .

  The average particle diameter of the fine particle aggregate in the present invention can be determined by measurement by a general laser diffraction method, scattering method, etc., and the average value of the diameter when assuming a circle equal to the projected area of the fine particle aggregate Is the average particle size.

  Moreover, the BET specific surface area in this invention is a specific surface area value which measured the amount of monomolecular adsorption | suction according to BET type | formula (Brunauer, Emmet and Teller'sequation).

  Examples of highly reactive metal organic compounds used in the present invention include aluminum and zirconium alkoxides, chelates, and acylates, that is, aluminum isopropylate, mono-sec-butoxyaluminum diisopropylate, aluminum sec-butyrate, aluminum ethylate, and ethyl acetoate. Acetate aluminum diisopropylate, alkyl acetoacetate aluminum diisopropylate, aluminum tris (ethyl acetoacetate), aluminum monoacetylacetonate bis (ethyl acetoacetate), aluminum tris (acetylacetonate), zirconium normal propylate, zirconium normal butyrate Rate, zirconium tetraacetylacetonate, zirconium monostearate, etc. That, without being limited thereto. Titanium-based alkoxides, chelates, acylates, etc. are also commonly used as highly reactive metal organic compounds, but titanium-based highly reactive metal organic compounds may cause discoloration of the varnish when chemically reacted with silanol groups. This is not preferable.

  In the present invention, it is desirable to contain a highly reactive metal organic compound in an amount of 3 to 20% by weight, preferably 5 to 15% by weight, based on the weight of silica. When the highly reactive metal organic compound is less than 3% by weight, the hydrogen bond network structure between the silanol group and water cannot be sufficiently weakened or destroyed, and the emulsification fluidity cannot be sufficiently improved. If it exceeds 20% by weight, the emulsification performance of the varnish itself will be deteriorated, or unreacted highly reactive metal organic compounds will react with the hydroxyl groups, carboxyl groups, unsaturated bonds, etc. of the binder resin, and gelation will occur over time. This is not preferable because there is a concern that the storage stability may be deteriorated. In addition, since the reactivity with silica differs depending on the selected highly reactive metal organic compound, it is desirable to add an optimum amount within the above range depending on the combination of the selected silica and highly reactive metal organic compound.

  The wet silica surface has more silanol groups than the dry silica surface, and when the mat varnish composition is emulsified, the emulsified mat varnish loses its fluidity because the silanol groups and water easily form a hydrogen bond network.

  Therefore, the hydrogen bond network structure of silanol groups on the silica surface and water is weakened by interposing a specific highly reactive metal organic compound, or the highly reactive metal organic compound and the silanol group on the silica surface are chemically bonded. Thus, it is possible to improve fluidity by partially hydrophobizing and breaking the hydrogen bond network structure. For this reason, it is desirable that an unreacted highly reactive metal organic compound is charged at the time of preparation of the offset overprint varnish composition or immediately before the dispersion step to co-disperse and react with silica. That is, as a simple example of the method for producing an overprint varnish composition for offset in the present invention, silica, a highly reactive metal organic compound, varnish, vegetable oil, a solvent are charged, stirred until uniform, three rolls, etc. It is desirable to disperse with.

  The varnish in the present invention refers to a resin obtained by dissolving a binder resin in a vegetable oil, a petroleum solvent, or the like, and is also used as a form of a gel varnish that is subjected to a gelation reaction by adding a gelling agent as necessary. . A part of the highly reactive metal organic compound used in the present invention is also used as a gelling agent when producing a gel varnish. The gelation reaction is usually performed at a high temperature of about 200 ° C., and the active site of the highly reactive metal organic compound is used for crosslinking between the binder resins. That is, in the manufacturing process of the overprint varnish composition for offset, the highly reactive metal organic compound in the gel varnish does not react with the silanol group on the silica surface even when mixed, stirred and dispersed with silica, Cannot be improved.

  Therefore, 3 to 20 wt%, preferably 5 to 15 wt% of unreacted highly reactive metal organic compound with respect to the silica weight is charged in the production of the overset varnish composition for heatset offset of the present invention, Or it is desirable to make it contain just before a silica dispersion | distribution process.

  There is also a method for improving the emulsification fluidity by using a silane coupling agent as a highly reactive metal organic compound or using silica whose surface has been hydrophobized with silanes or silicones. Silanes and silicones are strong catalyst poisons against platinum used as a catalyst for deodorizing exhaust gas used in off-wheel printing, and the deodorization performance is reduced due to poisoning of the platinum catalyst. This is not preferred when used for heat-set offset printing.

  In the present invention, polytetrafluoroethylene having an average particle diameter of 0.05 to 5 μm is desirably contained in combination of 2 to 15% by weight, more preferably 3 to 10% by weight. By using polytetrafluoroethylene within the above range, the effect of improving the friction resistance and the matting ability can be obtained supplementarily. If the polytetrafluoroethylene used in combination is less than 2% by weight, the effect of improving friction resistance and the matting effect cannot be obtained. The problem is likely to occur.

The polytetrafluoroethylene in the present invention desirably has an average particle size of 0.05 to 5 μm, more preferably 0.1 to 3 μm, and still more preferably 0.3 to 2.0 μm.
If the average particle size is less than 0.05 μm, the matte effect cannot be obtained. If the average particle size is more than 5 μm, the effect of improving the friction resistance is inferior, and problems such as piling are likely to occur.

  In the present invention, calcium carbonate, titanium oxide, alumina, porous calcium carbonate, porous titanium oxide, porous alumina or the like may be used alone or in combination of two or more kinds as necessary to obtain a matte effect in an auxiliary manner. However, the content is preferably 15% by weight or less in the offset overprint varnish composition. If the content is more than 15% by weight, problems such as deterioration of the paste properties in the production process of the varnish, deterioration of the plate wear at the time of printing, deterioration of the emulsification performance, and piling are caused.

  The binder resin used in the present invention is preferably a rosin phenol resin used in a general offset overprint varnish composition, and preferably has a weight average molecular weight of 10,000 to 120,000, more preferably 10,000. It is desirable that it is 100,000, more preferably 10,000 to 70,000. When the weight average molecular weight is less than 10,000, the viscoelasticity required for the varnish cannot be obtained, and when the weight average molecular weight is more than 120,000, the unreacted highly reactive metal organic compound and the rosin phenol resin undergo a gelation reaction. This is not preferable because there is a concern that the viscosity of the varnish is greatly increased. If necessary, a rosin alkyd resin, a petroleum resin, or the like used in general heat set offset printing may be used in combination.

  The vegetable oils in the present invention are vegetable oils and compounds derived from vegetable oils. Among triglycerides of glycerin and fatty acids, at least one fatty acid is a fatty acid having at least one carbon-carbon unsaturated bond, and those triglycerides. Examples thereof include fatty acid monoesters obtained by ester reaction with saturated or unsaturated alcohols, or fatty acid monoesters obtained by direct ester reaction between fatty acids of vegetable oil and monoalcohols, and ethers.

Examples of vegetable oils used in the present invention include soybean oil, regenerated soybean oil, rapeseed oil, coconut oil, cottonseed oil, peanut oil, palm fat, corn oil, olive oil, linseed oil, drill oil, safflower oil, rice bran oil, etc. Plant-derived ones, thermal polymerized oils thereof, oxygen-blown polymerized oils and the like can be used, and these can be used alone or in combination of two or more, but the iodine value ranges from 80 to 120. It is preferable to use the vegetable oil.
The fatty acid monoester is a fatty acid monoester obtained by transesterification of the above vegetable oil and monoalcohol or a direct ester reaction between the fatty acid of the vegetable oil and monoalcohol. Typical examples of monoalcohols include saturated alcohols such as methanol, ethanol, n- or iso-propanol, n, sec or t-butanol, heptynol, 2-ethylhexanol, hexanol, octanol, decanol, dodecanol, and oleyl alcohol. , Unsaturated fatty alcohols such as dodecenol, huseteri alcohol, somaryl alcohol, gadrelyl alcohol, 11-icosenol, 11-docosenol, 15-tetracosenol.

Representative examples of ethers include di-n-octyl ether, dinonyl ether, diheptyl ether, dihexyl ether, didecyl ether, nonyl hexyl ether, nonyl heptyl ether, nonyl octyl ether and the like. .
The petroleum solvent used in the ink of the present invention has an aromatic hydrocarbon content of 1% by weight or less, an aniline point of 75 to 95 ° C, preferably 80 to 95 ° C, and a boiling point of 240 ° C to 350 ° C, preferably 280. A petroleum solvent in the range of ˜350 ° C. is preferred. If the aniline point is less than 75 ° C., the ability to dissolve the resin is too high, which is not preferable because the setting property of the ink is slow, and if it exceeds 95 ° C., the solubility of the resin is poor. Unfavorable storage stability and the like. When the boiling point is less than 240 ° C, evaporation of the varnish solvent increases on the printing press, and deterioration of varnish fluidity induces deterioration of transferability of varnish to rollers, blankets, plates, and piling. This is not preferable. Moreover, when it exceeds 350 degreeC, since drying of a heat-set type ink is inferior, it is unpreferable.

  Furthermore, in the present invention, the offset overprint varnish composition described above may be used by adding 5 to 30% by weight in the offset ink.

In that case, arbitrary inorganic and organic pigments can be used as the pigment used.
Examples of inorganic pigments include yellow lead, zinc yellow, bitumen, barium sulfate, cadmium red, titanium oxide, zinc white, dial, alumina white, calcium carbonate, ultramarine, carbon black, graphite, aluminum powder, and organic pigments. As such, pigments used in offset inks such as azo, phthalocyanine, quinacridone, anthraquinone, and dioxazine are equivalent. Regarding organic pigments, for example, copper phthalocyanine pigments (CI Pigment Blue 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, CI Pigment Green 7, 36) Monoazo pigments (CI Pigment Red 3, 4, 5, 23, 48: 1, 48: 2, 48: 3, 48: 4, 49: 1, 49: 2, 53: 1, 57: 1 ), Disazo pigments (CI Pigment Yellow 12, 13, 14, 17, 83), anthraquinone pigments (CI Pigment Red 177), quinacridone pigments (CI Pigment Red 122, C.I.). CI Pigment Violet 19), dioxazine pigments (CI Pigment Violet 23), and the like. Not intended to be.
Furthermore, the overprint varnish composition for offset and the offset ink of the present invention include a gelling agent, a pigment dispersant, a metal dryer, a drying inhibitor, an antioxidant, a friction resistance improver, and an anti-set-off agent as necessary. Additives such as nonionic sea surface active agents and polyhydric alcohols can be conveniently used

  The substrate for printing the offset overprint varnish composition and offset ink of the present invention includes non-coated paper such as fine paper, fine coated paper, art paper, coated paper, lightweight coated paper, and cast coated paper. Coated paper, white paperboard, paperboard such as ball coat, synthetic paper, aluminum vapor-deposited paper, and plastic sheets such as polypropylene, polyethylene, polyethylene terephthalate, and polyvinyl chloride.

A laminate is a substrate used in the present invention.
(1) What printed the lithographic printing ink of this invention,
(2) Printed overprint composition of the present invention or (3) Printed material printed with the lithographic printing ink of the present invention or other printing ink (lithographic printing ink, gravure printing ink, screen printing ink, etc.) It refers to the printed surface printed with the overprint composition of the present invention.

  EXAMPLES Next, although an Example is given and this invention is demonstrated further more concretely, this invention is not limited by these Examples. In the present invention, “parts” represents parts by weight, and “%” represents “% by weight” unless otherwise specified.

(Phenolic resin production example)
P-octylphenol 1000 parts, 35% formalin 850 parts, 93% sodium hydroxide 60 parts and toluene 1000 parts were added to a four-necked flask equipped with a stirrer, cooler and thermometer, and reacted at 90 ° C. for 6 hours. It is dripping. Thereafter, 125 parts of 6N hydrochloric acid and 1000 parts of tap water were added, stirred and allowed to stand, and the upper layer part was taken out to obtain 2000 parts of a toluene solution of a resole-type phenol resin having a nonvolatile content of 49%. X.

(Example of production of rosin-modified phenolic resin)
A four-necked flask equipped with a stirrer, a condenser with a water separator, and a thermometer was charged with 1000 parts of gum rosin, dissolved at 200 ° C. while blowing nitrogen gas, and 1360 parts of resole liquid X was added to remove toluene. Then, after reacting at 230 ° C. for 4 hours, 110 parts of glycerin was charged, esterified at 250 to 260 ° C. until oxidation was 20 or less, and rosin-modified phenol resin A having a weight average molecular weight of 40000 (hereinafter referred to as resin A). Got.

(Manufacture of gel varnish)
A four-necked flask equipped with a stirrer, Liebig condenser and thermometer was charged with 43 parts of resin A (weight average molecular weight 40000), 9 parts of soybean oil, 47 parts of AF Solvent No. 7 (manufactured by Nippon Oil Corporation), 190 ° C After stirring for 30 minutes at the same temperature, the mixture was allowed to cool and charged with 1 part by weight of ethyl acetoacetate aluminum diisopropylate (ALCH manufactured by Kawaken Fine Chemical Co., Ltd., hereinafter referred to as ALCH) as a gelling agent. The gel varnish 1 (hereinafter referred to as varnish 1) was obtained by stirring at a temperature of 30 ° C. for 30 minutes.

(Manufacture of overprint varnish base and varnish composition for heatset offset)
17 parts of commercially available wet-process silica 1 (average particle size 3.6 μm, BET specific surface area 120 m ² / g), 52 parts of gel varnish 1, 15 parts of AF Solvent 7 (manufactured by Nippon Oil Corporation), soybean oil 5 Part, ALCH 1.5 parts, total 90.5 parts on 3 rolls, kneaded twice with 3 rolls at 60 ° C., and heatset offset overprint varnish base 1 (hereinafter base 1) Obtained. It was 0.7 micrometer when the average particle diameter of the base 1 was measured with the light-scattering method type particle size distribution analyzer. 3 parts of gel varnish 1 and 6.5 parts of AF solvent 7 were added to this base 1 to obtain about 100 parts of the offset overprint varnish composition of Example 1.

  In the same heatset offset overprint varnish base preparation method as above, a heatset offset overprint varnish base was prepared according to the formulation shown in Table 1, and the average particle size was measured by the same measurement method. Further, each offset overprint varnish base was adjusted with AF Solvent No. 7 and Gel Varnish 1 to obtain about 100 parts of the offset overprint varnish compositions of Examples 2-5 and Comparative Examples 1-3.

  In the heat-set type offset overprint varnish compositions of Examples 1 to 5 and Comparative Examples 1 to 3, the following evaluation was carried out on the matte feeling, friction resistance and emulsification fluidity, and the results are shown in Table 2. Indicated.

<Measuring method of matting effect>
A heat-set offset black ink (manufactured by Toyo Ink Manufacturing Co., Ltd., WD Leo-X ink M) was developed on coated paper using an RI tester (manufactured by Meisei Co., Ltd.) and the gloss value was measured (Murakami Color Research) (Gloss meter), a printed surface with a gloss value of 70 was obtained. After drying the paper surface, each offset overprint varnish composition of Examples 1 to 5 and Comparative Examples 1 to 3 was developed from above, passed through a self-made conveyor type hot air drying tester, and then the gloss value was measured. Evaluation was performed based on the evaluation criteria. Lower gloss value indicates higher matting effect (Evaluation criteria)
○: Gloss value is less than 20 Δ: Gloss value is 20 or more, less than 40 ×: Gloss value is 40 or more

<Measurement method of friction resistance>
After the above heat-set type offset black ink is developed on mat-coated paper using an RI tester (manufactured by Meisei Co., Ltd.), the overprint varnish compositions for offsets of Examples 1 to 5 and Comparative Examples 1 to 3 are And then pass through a self-conveyed hot air drying tester, place the mat-coated paper on the color surface, apply 5 reciprocating frictions with a Gakushin type friction resistance tester (weight 1 kg), and visually The degree of black ink taken on the matte coated paper on the color-exposed surface was observed and evaluated based on the following evaluation criteria.
(Evaluation criteria)
◯: Ink ink hardly transfers to mat coated paper applied on the color surface. △: Black ink moves slightly to mat coated paper applied on the color surface. ×: To mat coated paper applied on the color surface. A lot of black ink moves

<Measurement method of emulsification fluidity>
2 g of distilled water is added to 18 g of each heat-set offset overprint varnish composition of Examples 1 to 5 and Comparative Examples 1 to 3, and forcedly emulsified to obtain an emulsified varnish. The emulsified varnish 2.1 cc was set in a hemispherical container, the ink was dropped on an inclined plate inclined at 60 °, the length that flowed in 10 minutes was measured, and the evaluation was performed based on the following evaluation criteria. . The higher the value, the better the fluidity of the emulsified varnish.

(Evaluation criteria)
○: 20 mm or more Δ: 5 mm or more and less than 20 mm ×: less than 5 mm

  The overset varnish composition for heat-set type offset according to the present invention is superior in matting effect, friction resistance and emulsification fluidity than conventional ones, and has less environmental impact, and is useful in the printing field such as calendars, posters and catalogs. Utilization is planned.

Claims (8)

In the overprint varnish composition for offset containing silica, highly reactive metal organic compound, binder resin, vegetable oil and petroleum solvent,
Silica has an average particle size of 0.05 to 5 μm
and
The BET specific surface area is 50 to 400 m ² / g,
Highly reactive metal organic compound is 3 to 20% by weight of the total amount of silica
An overprint varnish composition for offset, which is contained.   2. The overprint varnish composition for offset according to claim 1, wherein the silica is wet silica and is contained in an amount of 5 to 30% by weight of the total amount of varnish.   The polytetrafluoroethylene having an average particle size of 0.05 to 5 µm is contained in the offset overprint varnish composition in an amount of 2 to 15% by weight based on the total amount of varnish. An overprint varnish composition for offset. The overprint varnish composition for offset according to any one of claims 1 to 3, wherein the overprint varnish composition for offset is a heat set type.   An offset ink comprising the overprint varnish composition for offset according to any one of claims 1 to 4 in an amount of 5 to 30% by weight based on the total amount of the ink.   A laminate obtained by printing the offset ink according to claim 5 on a substrate.   A laminate obtained by printing the offset overprint varnish composition according to claim 1 on a substrate.   The laminate according to claim 6, wherein the substrate is a printed material.