JP6098932B2 - Resin composition for printing ink, varnish for printing ink, and printing ink - Google Patents

Description

  The present invention relates to a resin composition for printing ink, a varnish for printing ink, and a printing ink.

  Global warming due to an increase in the concentration of carbon dioxide in the atmosphere is a serious problem, and various approaches for suppressing carbon dioxide emissions have been proposed. Among them, since the idea of “carbon neutral” in recent years has spread, studies for using plant-derived raw materials as chemical raw materials and fuels have been actively conducted. For binders for offset printing inks, rosin-modified phenolic resins have been used from the past because they have various properties such as high molecular weight, high softening point, high viscosity, high solubility in ink solvents, and excellent printability. Yes. The resin is mainly composed of rosin, alkylphenol formaldehyde condensate and polyol. From the viewpoint of “carbon neutral”, it is necessary to develop a resin for printing ink which does not use an alkylphenol formaldehyde condensate which is a petroleum-derived material.

  On the other hand, in offset printing, the speed of printing presses is increasing due to improved profitability and shorter delivery times of printed materials. This causes a problem that a large amount of ink mist is scattered from the printing press and the working environment during printing is deteriorated. As a method for improving this, there are a method of imparting conductivity by setting the resin for ink to high polarity, a method of increasing the elasticity of the ink as a high molecular weight, etc. There was a tendency for the sex to decline.

  As means for solving such problems of ink performance, a printing ink using a rosin-modified phenol resin containing dimer acid (see Patent Document 1) and two types of rosin-modified phenol resins having different weight average molecular weights were used in combination. A printing ink (see Patent Document 2) has been proposed. In addition, the present applicant also has a printing ink using a rosin-modified phenol resin containing rosins containing 5 to 20% of dehydroabietic acid (see Patent Document 3), and a rosin-modified phenol resin using rosins derived from slash pine. The printing ink used (refer patent document 4) is proposed. However, all of these methods use a large amount of alkylphenol and formaldehyde, which are petroleum-derived raw materials.

  Therefore, a method of using a rosin-based polyester resin that does not use alkylphenol or formaldehyde as a raw material is also conceivable (see, for example, Patent Document 5), but has not reached the level of misting resistance corresponding to recent high-speed printing. .

JP 2004-300999 A JP 2011-89021 A JP 2011-184660 A JP 2012-1714 A Japanese Patent No. 4045417

  The present invention has various ink performances (drying properties, emulsification properties, etc.) equivalent to rosin-modified phenolic resins, and reduces the mist amount of printing ink without impairing the gloss of printed matter and the fluidity of printing ink. The main purpose is to provide a resin composition for printing ink, a varnish for printing ink, and a printing ink having a high ratio of raw materials.

  In order to solve the above-mentioned problems, the present inventor has paid attention to specific rosin species, polycarboxylic acid species, and polyol species, and can solve the above problems by using a resin having a specific physical property range. The headline and the present invention were completed.

  That is, the present invention reacts with rosin (a) containing polymerized rosin as an essential component, alkyl or alkenyl succinic anhydride (b) having 10 to 40 carbon atoms, and polyol (c) containing glycerin as an essential component. The clouding point of the resin / No. 0 Solvent H = 1/9 wt% solution is 100 to 180 ° C. in a chemtronic cloud point measuring device manufactured by NOVOMATICS, which is obtained by reacting with a sulfonic acid catalyst as a component. A resin composition for printing ink having an acid value of 10 to 20 mgKOH / g and a hydroxyl value of 30 to 50 mgKOH / g; a resin composition for printing ink and a varnish for printing ink containing vegetable oil and / or petroleum solvent; The present invention relates to a printing ink using the printing ink varnish.

  According to the present invention, it has various ink performance (drying property, emulsifying property, etc.) equivalent to rosin-modified phenolic resin, and has reduced the mist amount of printing ink without impairing the gloss and fluidity of the printed matter. A resin composition for printing ink having a high raw material ratio can be provided. Therefore, the resin composition for printing ink according to the present invention is particularly suitable for offset inks such as offset sheet-fed ink (sheet-fed ink), offset rotary ink (off-wheel ink), and newspaper ink, as well as letterpress printing ink and gravure printing. It is also suitable as a binder for ink and the like.

  The resin composition for printing inks of the present invention comprises a rosin (a) (hereinafter referred to as component (a)) having a polymerized rosin as an essential component, an alkyl or alkenyl succinic anhydride (b) having 10 to 40 carbon atoms (b) ( Hereinafter, it is a reaction product obtained by reacting a component (b)) and a polyol (c) (hereinafter referred to as component (c)) having glycerin as an essential component using a sulfonic acid catalyst.

  As the component (a), a polymerized rosin obtained by polymerizing natural rosin is an essential component. The content of the polymerized rosin in the component (a) is not particularly limited, but is preferably 50% by weight or more.

  As the component (a), rosins other than polymerized rosin can be used as necessary. The rosins that can be used in combination are not particularly limited, and known rosins can be used. Specifically, for example, natural rosin such as gum rosin, tall oil rosin, wood rosin, and α, β unsaturated carboxylic acid modified rosin obtained by subjecting the natural rosin and α, β unsaturated carboxylic acid to Diels-Alder reaction, Examples include disproportionated rosin obtained by disproportionating natural rosin, and hydrogenated rosin obtained by hydrogenating natural rosin. The α, β unsaturated carboxylic acid modification, disproportionation, and hydrogenation may be appropriately combined. For example, the natural rosin may be hydrogenated and then disproportionated, or the natural rosin may be hydrogenated and disproportionated after being modified with an α, β unsaturated carboxylic acid. Examples of the α, β unsaturated carboxylic acids used for modifying the α, β unsaturated carboxylic acid include α, β unsaturated dicarboxylic acids such as maleic acid, maleic anhydride and fumaric acid, acrylic acid, and methacrylic acid. Α, β unsaturated monocarboxylic acids and the like.

  The component (b) is not particularly limited as long as it is an alkyl or alkenyl succinic anhydride having a total carbon number of 10 to 40, and known components can be used. Specifically, octenyl succinic anhydride, decenyl succinic anhydride, dodecenyl succinic anhydride, tetradecenyl succinic anhydride, hexadecenyl succinic anhydride, octadecenyl succinic anhydride, eicosenyl succinic anhydride, methylundecenyl succinic anhydride, allylcyclohexane Examples include pentenyl succinic anhydride, octyl succinic anhydride, decyl succinic anhydride, dodecyl succinic anhydride, tetradecyl succinic anhydride, hexadecyl succinic anhydride, octadecyl succinic anhydride, methylundecyl succinic anhydride, and allylcyclopentyl succinic anhydride. The resin composition for printing ink can have a high molecular weight, and can provide appropriate solubility.

  The component (c) is not particularly limited as long as it is a compound having glycerin as an essential component and having at least two hydroxyl groups in one molecule when used in combination, and known components can be used. Specifically, for example, diols such as triethylene glycol, diethylene glycol, ethylene glycol, and neopentyl glycol, triols such as glycerin, trimethylolethane, and trimethylolpropane, and tetraols such as pentaerythritol, diglycerin, and ditrimethylolpropane. Polyols having 5 or more valences such as all and dipentaerythritol are exemplified. Among the components (c), triols and / or tetraols are preferable because the physical properties (softening point, weight average molecular weight, etc.) of the resin composition for printing inks according to the present invention can be easily controlled. Glycerol is classified into natural glycerin using fats and oils and synthetic glycerin using petroleum as raw materials. From the viewpoint of increasing the ratio of plant-derived raw materials, natural glycerin is more preferable, and the ratio is 100% by weight of natural glycerin. Is used at 50% by weight or more.

  Although the usage-amount of a component (a), a component (b), and a component (c) is not specifically limited, Usually, the usage-amount of a component (a) is 75-75 on the basis of the total of 100 weight% of the usage-amount of all the components. The amount of component (b) used is about 3 to 13% by weight, and the amount of component (c) used is about 9 to 12% by weight. The balance of ink performance is improved by the amount of each component used.

The resin composition for printing ink of the present invention contains a resin for printing ink obtained by reacting the component (a), the component (b), and the component (c) in the presence of a sulfonic acid catalyst. Each component may be reacted sequentially or simultaneously. For example, component (a) to component (c) are added and reacted at the same time, or component (b) is added to the reaction product of component (a) and component (c). The method of making it react is mentioned.

In the production, conditions such as reaction temperature and reaction time are not particularly limited, but the reaction temperature is usually about 100 to 300 ° C., and the reaction time is usually about 1 to 24 hours. Examples of the sulfonic acid catalyst include methanesulfonic acid, paratoluenesulfonic acid, dodecylbenzenesulfonic acid, and the like. By using a sulfonic acid catalyst, suitable emulsification resistance can be imparted to the resin composition for printing ink.

  The acid value (JIS K5601) of the resin composition for printing ink of the present invention is about 10 to 20 mg KOH / g, and the hydroxyl value (JIS 0070) is 30 to 50 mg KOH / g. The emulsification resistance and fluidity of the ink can be adjusted to an appropriate range.

The printing ink resin used in the present invention needs to have a cloud point of 100 to 180 ° C. of a resin / No. 0 solvent H = 1/9 wt% solution using a chemtronic cloud point measuring device manufactured by NOVOMATICS. is there. By being in the numerical range, it is possible to give appropriate gloss and fluidity to the printed matter. Incidentally, No. 0 Solvent H is a paraffinic solvent manufactured by JX Nippon Oil & Energy.

Moreover, the weight average molecular weight (polystyrene conversion value in gel permeation chromatography) of the printing ink resin is not particularly limited, but is usually about 20,000 to 300,000. Considering the balance of printing ink performance, especially the balance between the flowability and misting resistance of printing ink, the weight average molecular weight is preferably about 50,000 to 200,000, more preferably about 80,000 to 200,000, and more Preferably it is 100,000-200,000.

    Further, the softening point (JIS K5601) is not particularly limited, but is usually about 120 to 200 ° C, preferably 140 to 200 ° C. By being in the numerical range, the resin composition for printing ink can be added to the printing ink solvent. The solubility becomes good, and sufficient solubility can be maintained even when a varnish described later is used.

  The varnish for printing ink of the present invention contains the resin composition for printing ink of the present invention, and vegetable oil and / or petroleum solvent.

  Examples of vegetable oils include vegetable oils such as linseed oil, tung oil, safflower oil, dehydrated castor oil, soybean oil, linseed oil fatty acid methyl, soybean oil fatty acid methyl, linseed oil fatty acid ethyl, soybean oil fatty acid ethyl, linseed oil fatty acid Examples thereof include vegetable oil monoesters such as propyl, soybean oil fatty acid propyl, linseed oil fatty acid butyl, soybean oil fatty acid butyl, etc., and these can be used alone or in combination of two or more.

  Examples of the petroleum solvent include petroleum solvent manufactured by JX Nippon Oil & Energy Corporation, No. 0 solvent, No. 4, Solvent No. 5, Solvent No. 6, Solvent No. 7, AF Solvent No. 4, AF Solvent No. 5, AF Solvent No. 6, AF Solvent No. 7 and the like can be mentioned, and one kind can be used alone, or two or more kinds can be combined. Among these, those having a boiling point of 200 ° C. or more and an aromatic hydrocarbon content of 1% by weight or less are particularly preferable from the viewpoint of environmental measures. Moreover, if only the said vegetable oil is used, without using a petroleum solvent, the plant-derived raw material ratio in printing ink can be raised.

  The varnish for printing ink can be produced by reacting the resin composition for printing ink and various known gelling agents in vegetable oils and / or petroleum solvents. Preferably, the plant-derived raw material ratio in the printing ink can be increased by reacting the resin composition for printing ink and various known gelling agents in vegetable oils. In addition, an additive such as an antioxidant can be used in the reaction. The temperature during production is usually about 100 to 240 ° C.

  Examples of the gelling agent include aluminum gels such as aluminum octylate, aluminum stearate, aluminum triisopropoxide, aluminum tributoxide, aluminum dipropoxide monoacetyl acetate, aluminum dibutoxide monoacetyl acetate, and aluminum triacetyl acetate. An agent is mentioned, 1 type can be used individually or 2 or more types can be combined.

  The printing ink of the present invention is obtained by using the printing ink varnish. Specifically, the varnish for ink, the pigment (yellow, red, indigo, black, etc.), and if necessary, the vegetable oil and petroleum-based solvent for ink, and additives such as surfactants and waxes are added to a roll mill. And kneaded using an ink manufacturing apparatus such as a ball mill, an attritor, and a sand mill to prepare an appropriate ink constant.

  Hereinafter, the present invention will be described more specifically with reference to production examples and examples, but the present invention is not limited thereto.

  “Part” means part by weight. The “33 wt% linseed oil viscosity” is a mixture of heat-mixed resin and linseed oil in a 1 to 2 weight ratio at 25 ° C. using a cone and plate viscometer manufactured by Nippon Rheology Co., Ltd. The measured viscosity. In addition, “weight average molecular weight” uses a commercially available gel permeation chromatography device (HLC-8120GPC manufactured by Tosoh Corporation), a commercially available column (TSK-GEL column manufactured by Tosoh Corporation), and tetrahydrofuran as a developing solvent. Measured in terms of polystyrene. In addition, “cloud point” means that resin and No. 0 Solvent H (manufactured by JX Nippon Mining & Energy Corporation) are weighed into a specified container at a weight ratio of 1: 9, and a chemtronic cloud point measuring device (manufactured by NOVOMATICS) , Measured by Chemotronic II).

Production Example 1
(Production of alkylphenol-formaldehyde condensate)
A reaction vessel similar to Production Example 1 was charged with 1,000 parts of octylphenol, 396 parts of 92% by weight paraformaldehyde, 584 parts of xylene and 500 parts of water, and the temperature was raised to 50 ° C. with stirring. Next, 89 parts of a 45 wt% sodium hydroxide solution was charged into the same reaction vessel, and the reaction system was gradually warmed to 90 ° C. while cooling, then kept warm for 2 hours, and sulfuric acid was added dropwise to bring the pH to around 6. It was adjusted. Thereafter, the aqueous layer containing formaldehyde and the like was removed, washed again with water, and then the contents were cooled to obtain a 70 wt% xylene solution of resol type octylphenol.

Example 1
(Manufacture of resin composition A for printing ink)
In a reaction vessel equipped with a stirrer, a reflux condenser with a water separator and a thermometer, 654 parts of polymerized rosin (trade name: Aradim R-140, Guangxi Yinzhou Arakawa Chemical Co., Ltd.), 163 parts of Chinese gum rosin, 37 parts of maleic anhydride In addition, 41 parts of octadecenyl succinic anhydride was charged, and the mixture was heated to 180 ° C. with stirring in a nitrogen atmosphere and melted. Next, 35 parts of pentaerythritol and 70 parts of glycerin (manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.) were added, the temperature was raised to 260 ° C. with stirring, and 1 part of paratoluenesulfonic acid was added when the acid value was 30 or less. The reaction was continued until the value was 20 or less. After completion of the esterification reaction, the 33 wt% linseed oil viscosity was adjusted to 10 Pa · s, and the pressure was reduced and cooled at 0.02 MPa for 10 minutes to obtain a resin composition A for printing ink. The physical properties are shown in Table 1.

Example 2
(Production of resin composition B for printing ink)
Into the same reaction vessel as in Example 1, 383 parts of polymerized rosin (trade name: Aradim R-140, manufactured by Guangxi Yinzhou Arakawa Chemical Co., Ltd.), 383 parts of Chinese gum rosin, 53 parts of fumaric acid and 61 parts of octadecenyl succinic anhydride were charged. While stirring in a nitrogen atmosphere, the mixture was heated to 180 ° C. and melted. Next, 60 parts of pentaerythritol and 60 parts of glycerin (manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.) were added, the temperature was raised to 260 ° C. with stirring, and 1 part of paratoluenesulfonic acid was added when the acid value became 30 or less. The reaction was continued until the value was 20 or less. After completion of the esterification reaction, the 33 wt% linseed oil viscosity was adjusted to 10 Pa · s, and the pressure was reduced and cooled at 0.02 MPa for 10 minutes to obtain a resin composition B for printing ink. The physical properties are shown in Table 1.

Example 3
(Manufacture of resin composition C for printing ink)
Into the same reaction vessel as in Example 1, 658 parts of polymerized rosin (trade name Aradaim R-140, manufactured by Guangxi Yinzhou Arakawa Chemical Co., Ltd.), 165 parts of Chinese gum rosin, 29 parts of maleic anhydride and 49 parts of hexadecenyl succinic anhydride are charged. The mixture was heated to 180 ° C. with stirring in a nitrogen atmosphere and melted. Next, 25 parts of pentaerythritol and 74 parts of glycerin (manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.) were added, the temperature was raised to 260 ° C. with stirring, and 1 part of paratoluenesulfonic acid was added when the acid value became 30 or less. The reaction was continued until the value was 20 or less. After completion of the esterification reaction, the 33 wt% linseed oil viscosity was adjusted to 10 Pa · s, and the pressure was reduced and cooled at 0.02 MPa for 10 minutes to obtain a resin composition C for printing ink. The physical properties are shown in Table 1.

Comparative Example 1
(Production of rosin-modified phenolic resin)
In the same reaction vessel as in Example 1, 970 parts of gum rosin and 30 parts of disproportionated rosin were charged and heated to 180 ° C. with stirring in a nitrogen atmosphere and melted. Next, 93 parts of pentaerythritol and 3 parts of magnesium hydroxide were added, the temperature was raised to 280 ° C. with stirring, and the reaction was continued until the acid value was 25 mgKOH / g or less. After further cooling to 230 ° C., 857 parts of a 70 wt% xylene solution of resol-type octylphenol of Production Example 1 (solid content: 600 parts) was dropped into the system over a period of 9 hours within a temperature range of 230 to 260 ° C. After completion of the dropping, the viscosity of 33% by weight linseed oil was adjusted to 10 Pa · s, and the pressure was reduced at 0.02 MPa for 10 minutes, followed by cooling to obtain a rosin-modified phenolic resin. The physical properties are shown in Table 1.

Comparative Example 2
(Manufacture of resin composition D for printing ink)
Into the same reaction vessel as in Example 1, 676 parts of polymerized rosin (trade name: Silvatac 140, manufactured by Silvachem), 68 parts of stearic acid and 135 parts of terephthalic acid were charged, and the temperature was raised to 180 ° C. while stirring in a nitrogen atmosphere. And melted. Next, 121 parts of pentaerythritol was added, heated to 260 ° C. with esterification, and esterified. When the acid value became 50 or less, 1 part of paratoluenesulfonic acid was added and reacted until the acid value became 20 or less. . Thereafter, the viscosity of 33% by weight linseed oil was adjusted to 8 Pa · s, reduced in pressure at 0.02 MPa for 10 minutes, and cooled to obtain a resin composition D for printing ink. The physical properties are shown in Table 1.

Comparative Example 3
(Manufacture of resin composition E for printing ink)
Into the same reaction vessel as in Example 1, 571 parts of polymerized rosin (trade name: Aradim R-140, manufactured by Guangxi Yinzhou Arakawa Chemical Co., Ltd.), 143 parts of Chinese gum rosin, 32 parts of maleic anhydride, and 143 parts of octadecenyl succinic anhydride, While stirring in a nitrogen atmosphere, the mixture was heated to 180 ° C. and melted. Next, 37 parts of pentaerythritol and 74 parts of glycerin (manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.) were added, the temperature was raised to 260 ° C. with stirring, and 1 part of paratoluenesulfonic acid was added when the acid value was 30 or less. The reaction was continued until the value was 20 or less. After completion of the esterification reaction, the 33 wt% linseed oil viscosity was adjusted to 10 Pa · s, and the pressure was reduced and cooled at 0.02 MPa for 10 minutes to obtain a resin composition B for printing ink. The physical properties are shown in Table 1.

Comparative Example 4
(Manufacture of resin composition F for printing ink)
In a reaction vessel similar to that in Example 1, 681 parts of polymerized rosin (trade name: Aradim R-140, manufactured by Guangxi Yinzhou Arakawa Chemical Co., Ltd.), 170 parts of Chinese gum rosin, 38 parts of maleic anhydride and 9 parts of octadecyl succinic anhydride, While stirring in a nitrogen atmosphere, the mixture was heated to 180 ° C. and melted. Subsequently, 51 parts of pentaerythritol and 51 parts of glycerin (manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.) were added, the temperature was raised to 260 ° C. with stirring, and 1 part of paratoluenesulfonic acid was added when the acid value was 30 or less. The reaction was continued until the value was 20 or less. After completion of the esterification reaction, the 33 wt% linseed oil viscosity was adjusted to 10 Pa · s, and the pressure was reduced and cooled at 0.02 MPa for 10 minutes to obtain a resin composition F for printing ink. The physical properties are shown in Table 1.

Comparative Example 5
(Manufacture of resin composition G for printing ink)
Into a reaction vessel similar to that in Example 1, 654 parts of polymerized rosin (trade name Aradaim R-140, manufactured by Guangxi Yinzhou Arakawa Chemical Co., Ltd.), 163 parts of Chinese gum rosin, 37 parts of maleic anhydride, 41 parts of octadecyl succinic anhydride, While stirring in a nitrogen atmosphere, the mixture was heated to 180 ° C. and melted. Next, 35 parts of pentaerythritol and 70 parts of glycerin (manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.) were added, the temperature was raised to 250 ° C. with stirring, and the reaction was continued until the acid value was 30 or less. After completion of the esterification reaction, the 33 wt% linseed oil viscosity was adjusted to 10 Pa · s, and the pressure was reduced and cooled at 0.02 MPa for 10 minutes to obtain a resin composition G for printing ink. The physical properties are shown in Table 1.

  Table 1 shows the physical properties of the resin compositions for printing inks obtained in the examples and comparative examples. When the weight average molecular weight of the resin composition for printing ink of Comparative Example 3 was measured, the molecular weight was not measured because clogging occurred when the THF solution was passed through a membrane filter having a pore diameter of 0.45 μm as a pretreatment. .

(Preparation of varnish for printing ink)
40.0 parts of resin composition A for printing ink and 60.0 parts of linseed oil were mixed and dissolved at 200 ° C. for 30 minutes and cooled to 100 ° C. Next, 1.0 part of aluminum dipropoxide monoacetylacetate (trade name Kellop EP-2, manufactured by Hope Pharmaceutical Co., Ltd.) is added as a gelling agent, and the mixture is heated to 200 ° C. for 1 hour to cause a gelation reaction. A varnish (gel varnish) was obtained. Similarly, a varnish for printing ink (gel varnish) containing 1.0 part of aluminum dipropoxide monoacetyl acetate was also prepared. Moreover, the gel varnish was similarly adjusted about the rosin modified phenolic resin and the resin compositions B to G for printing ink.

(Preparation of printing ink)
About the varnish for printing ink prepared by the said method, the raw material shown below is used, A tack value (Incometer value in 30 degreeC and 400 rpm) is 9.0 +/- 0.5, Flow value (The spread meter of 25 degreeC) The blending amount was adjusted so that the (diameter value) was 35.0 ± 1.0, and a printing ink was prepared using a three-roll mill.

Phthalocyanine blue (indigo pigment) 17 parts by weight Varnish for printing ink 64-75 parts by weight Linseed oil 6-17 parts by weight Cobalt dryer 2 parts by weight

(Performance test of printing ink)
The performance of each printing ink prepared by the above method was evaluated by the following test. The results are shown in Table 2.
(Glossy)
After 0.4 ml of ink was developed on art paper using an RI tester (manufactured by Ishikawajima Industrial Machinery Co., Ltd.), 23 ° C., 50% R.D. H. For 24 hours, and the reflectivity of 60 ° -60 ° was measured with a gloss meter. The larger the value, the better the gloss.
(Missing resistance)
2.6 ml of ink is spread on an incometer (manufactured by Toyo Seiki Seisakusho Co., Ltd.), rotated at a roll temperature of 30 ° C. for 1 minute at 400 rpm, and further rotated at 1800 rpm for 2 minutes, and the ink on the white paper placed directly under the roll The scattering degree was observed and evaluated in 1 to 5 stages. A larger value indicates better misting resistance.
(Drying)
After 0.2ml of ink was developed on parchment paper with an RI tester (Ishikawajima Industrial Machinery Co., Ltd.), the parchment paper was layered on the surface and the C-type drying tester (manufactured by Toyo Seiki Seisakusho Co., Ltd.) Wound around a rotating drum. The time (time) when the pressing gear was applied to rotate the drum and the tooth pattern of the pressing gear did not move was defined as the drying time. The smaller the value, the better the drying property.
(Emulsification resistance)
3.9 ml of ink was developed on a dynamic emulsification tester (manufactured by Nippon Rheology Equipment Co., Ltd.), pure water was supplied at a roll temperature of 30 ° C. and 200 rpm at a rate of 5 ml / min, and the water content in this ink Was measured with an infrared moisture meter to obtain an emulsification rate (%) of the ink. The smaller the value, the better the emulsification resistance.
(Liquidity)
In a room air-conditioned at 25 ° C., 1.3 ml of ink was placed on the upper end of a glass plate forming an angle of 60 ° with the ground plane, and the distance of flowing for 30 minutes was measured. It shows that fluidity | liquidity is so favorable that a numerical value is large.

Claims (6)

Resin containing rosin (a) having polymerized rosin as an essential component, alkyl or alkenyl succinic anhydride (b) having 10 to 40 carbon atoms, and polyol (c) having glycerin as an essential component, and sulfonic acid type The cloud point of the resin / No. 0 Solvent H = 1/9 wt% solution in the NOVOMATICS chemotronic cloud point measuring device obtained by reacting with a catalyst is 100 to 180 ° C., and the acid value is 10 to 10%. A printing ink resin composition comprising a printing ink resin having a 20 mg KOH / g and a hydroxyl value of 30 to 50 mg KOH / g. The resin composition for printing ink according to claim 1, wherein the rosin (a) containing the polymerized rosin as an essential component has a polymerized rosin content of 50% by weight or more. The resin composition for printing ink according to claim 1 or 2, wherein the natural glycerin content of the polyol (c) containing glycerin as an essential component is 50% by weight or more. A total of 100% by weight of the rosins (a) having a polymerized rosin as an essential component, the alkyl or alkenyl succinic anhydride (b) having 10 to 40 carbon atoms and the polyols (c) having glycerin as essential components is used. The amount of component (a) used is 75 to 88% by weight, the amount of component (b) is 3 to 13% by weight, and the amount of component (c) is 9 to 12% by weight as a reference. 4. The resin composition for printing ink according to any one of 3 above. A printing ink varnish containing the resin composition for printing ink according to any one of claims 1 to 4 and a vegetable oil and / or a petroleum solvent. A printing ink comprising the varnish for printing ink according to claim 5.