JP2019116579A - Lithographic printing ink composition and printed matter - Google Patents

Abstract

To provide a lithographic printing ink composition having no extreme reduction of content of plant oil, no generation of aggravation of blocking or scratch resistance, and capable of providing a printed matte having high flexibility.SOLUTION: There is provided a lithographic printing ink composition containing a rosin modified phenol resin (A), an alkyd resin (B), a plant oils (C) and a pigment, in which weight average molecular weight of the rosin modified phenol resin (A) is 50,000 to 130,000, a phenol structure unit constituting the rosin modified phenol resin (A) contains an alkyl group having 4 to 18 carbon atoms, the alkyd resin (B) contains a plant oil modified alkyd resin (b), and iodine number of the plant oil (C) is 50 to 140 mg/100 mg.SELECTED DRAWING: None

Description

  The present invention relates to a lithographic printing ink composition (hereinafter also referred to as "lithographic ink" or "ink") used in offset printing, and a printed matter thereof.

  In recent years, in the printing industry, awareness of environmental considerations for printed matter and printing work sites is increasing, and high environmental performance is also required for inks. In the case of a lithographic printing ink used in offset printing, an ink in which a highly volatile petroleum solvent which has been conventionally used is replaced with an aroma-free solvent (a solvent having an aromatic component content of less than 1% by mass), Investigation and development of inks (non-VOC inks) substantially free of volatile organic compounds have been promoted (see Patent Documents 1 and 2).

  Above all, with the spread and expansion of the Biomass Mark (Japan Organic Resource Association of Japan) certified for environmentally conscious products using biological origin resources, it contains vegetable oil which is biomass material instead of petroleum based solvent There is a growing demand for non-VOC inks.

  On the other hand, the "oxidation polymerization type" drying method generally used in offset printing means that after printing on a printing substrate such as paper, the oxygen in the air causes oxidation polymerization of the components in the ink to solidify and dry It is. In the case of the non-VOC ink containing the above-mentioned vegetable oil component, the vegetable oil which is the main component participates in the oxidative polymerization reaction, and the resulting printed matter becomes excellent in rigidity. However, in the case of printing on a flexible printing substrate, the printing layer can not follow the deformation of the printing substrate, and problems such as generation of cracks during post-processing occur.

  As a method of solving the above problems, for example, a method using a plasticizer as an additive can be considered, but there is a risk that the plasticizer may cause a bleeding phenomenon or deteriorate the blocking property and the abrasion resistance. I could not say. In addition, Patent Document 3 discloses a method of using an ethylene / unsaturated carboxylic acid copolymer as a resin, but the ink becomes over-emulsified and the printability (especially, the density fluctuation) is significantly deteriorated. Again, it was not a preferred method.

  As described above, a lithographic printing ink composition which can obtain a print having high flexibility without deteriorating the blocking property and the abrasion resistance without excessively reducing the content of the vegetable oil has hitherto been described. Was not present in the

JP 2004-204203 A JP, 2005-060993, A JP 2003-183564

  The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to have high flexibility without causing blocking and deterioration of scratch resistance without excessively reducing the content of vegetable oil. An object of the present invention is to provide a lithographic printing ink composition capable of obtaining a printed matter.

  As a result of intensive research conducted by the present inventors to solve the above problems, the present inventors have found a lithographic printing ink composition containing a rosin modified phenolic resin, an alkyd resin and a vegetable oil as defined below, and have completed the present invention. .

That is, the present invention is a lithographic printing ink composition comprising a rosin modified phenolic resin (A), an alkyd resin (B), a vegetable oil (C), and a pigment,
The weight average molecular weight of the rosin modified phenolic resin (A) is 50,000 to 130,000, and the phenolic structural unit constituting the rosin modified phenolic resin (A) is an alkyl group having 4 to 18 carbon atoms Including
The alkyd resin (B) comprises a vegetable oil modified alkyd resin (b),
The present invention relates to a lithographic printing ink composition wherein the vegetable oil (C) has an iodine value of 50 to 140 mg / 100 mg.

  The present invention also relates to the above lithographic printing ink composition, wherein the content of the vegetable oil-modified alkyd resin (b) is 5 to 20% by mass in the total of the lithographic printing ink composition.

  The present invention also relates to a printed matter in which the above-mentioned lithographic printing ink composition is printed on a substrate.

  The present invention provides a lithographic printing ink composition capable of obtaining a print having high flexibility without causing blocking and deterioration of abrasion resistance without excessively reducing the content of a vegetable oil component. It has become possible.

  The lithographic printing ink composition of the present invention is described in detail below. Note that the present invention is not limited to the following embodiments, and includes modifications implemented without departing from the scope of the present invention. Moreover, "part" "%" represents "mass part" "mass%" unless there is particular notice.

  As described above, the lithographic ink of the present invention is used in combination with a rosin modified phenolic resin having a specific structure and defined weight average molecular weight, an alkyd resin modified with a vegetable oil, and a vegetable oil having a specific iodine value By doing this, it is possible to obtain a print having high flexibility without causing blocking and deterioration of scratch resistance. The principle by which the problems of the present invention can be solved by the lithographic ink having the above-described structure will be described below. The following is an inference, and does not limit the present invention.

  As described in the prior art, in the case of Non-VOC ink containing a vegetable oil, the vegetable oil contained in the ink participates in the oxidative polymerization reaction. At this time, the reaction site of the oxidative polymerization reaction is the unsaturated bond present in vegetable oil, and the amount is represented by the iodine value.

  The iodine value of the vegetable oil (C) used for the lithographic ink of the present invention is 50 to 140 mg / 100 mg. By using the vegetable oil component which has the said iodine value, the space | interval between reaction points can be extended moderately and a crosslinking density can be reduced suitably. As a result, the flexibility of the printed matter can be improved without using an additive such as a plasticizer.

  In the present invention, a rosin modified phenolic resin (A) having a weight average molecular weight of 50,000 to 130,000 and a phenolic structural unit containing an alkyl group having 4 to 18 carbon atoms is used. A rosin-modified phenolic resin having a large weight-average molecular weight is incorporated into the crosslinked structure formed by the vegetable oil (C), and the crosslink density is further reduced by the steric hindrance due to the alkyl group having 4 to 18 carbon atoms. Sex is further improved.

  On the other hand, if the crosslinking density of the printed matter is merely reduced as described above, the printed matter may have tackiness and the blocking property and the abrasion resistance may be deteriorated. So, in this invention, it is characterized by using vegetable oil modified | denatured alkyd resin (b) together in order to solve the said subject. The vegetable oil portion of the vegetable oil-modified alkyd resin (b) causes oxidative polymerization with the vegetable oil (C), whereby the vegetable oil-modified alkyd resin (b) is incorporated into the cross-linked structure to make the coating film fast, and the above blocking property and resistance It is believed that the abradability improves.

  As described above, the constitution of the lithographic ink of the present invention is indispensable in order to obtain a print having high flexibility without causing blocking and deterioration of scratch resistance.

  Subsequently, main materials constituting the lithographic ink of the present invention will be described in detail.

  The rosin modified phenolic resin (A) used in the present invention has a weight average molecular weight of 50,000 to 130,000 and includes a phenol structural unit having an alkyl group having 4 to 18 carbon atoms.

  The weight average molecular weight of the rosin modified phenolic resin (A) is 50,000 to 130,000, and more preferably 80,000 to 100,000. By containing the weight average molecular weight in the above-mentioned range, the crosslink density when incorporated into the crosslink structure becomes suitable, and the improvement of the coating film flexibility and the suppression of the tackiness, the blocking and the deterioration of the abrasion resistance are obtained. It is compatible. Further, by setting the viscosity to 50,000 or more, the viscosity of the ink can also be made suitable, generation of misting and the like can be suppressed, and the stability and printability of the ink on the printing press can be improved. Furthermore, by setting it to 130,000 or less, the solubility of the resin is improved, and the fluidity of the ink and the gloss of the printed matter are improved.

  In addition, the said weight average molecular weight is the polystyrene conversion amount measured by gel permeation chromatography (GPC).

  Moreover, although carbon number of the alkyl group contained in a phenol structural unit is 4-18 as above-mentioned, it is preferable that it is 8-16, and it is especially preferable that it is 9-12. By setting the carbon number of the alkyl group in the above range, the effect of the steric hindrance by the alkyl group is improved, and the coating film flexibility becomes suitable. In addition, the softening point and the viscoelasticity of the rosin modified phenolic resin (A) itself can be made suitable, and the solubility in ink can also be improved.

As the alkyl group, n-butyl group, sec-butyl group, isobutyl group, tert-butyl group, n-pentyl group, isopentyl group, neopentyl group, n-hexyl group, isohexyl group, tert-hexyl group, n-heptyl Group, isoheptyl group, tert-heptyl group, n-octyl group, isooctyl group, tert-octyl group, n-nonyl group, isononyl group, tert-nonyl group, n-decyl group, isodecyl group, tert-decyl group, n -Dodecyl group, isododecyl group, tert-dodecyl group, n-tridecyl group, isotridecyl group, n-tetradecyl group, isotetradecyl group, n-hexadecyl group, isohexadecyl group, n-octadecyl group, isooctadecyl group, etc. Is exemplified, but not limited to the above.
Among the above, from the viewpoint of coating film flexibility, n-nonyl group, isononyl group, n-decyl group, isodecyl group, n-dodecyl group and isododecyl group are preferably selected.

  The content of the rosin-modified phenolic resin (A) is preferably 15 to 30% by mass, more preferably 20 to 25% by mass, based on the total amount of the lithographic ink. By setting the content of the rosin modified phenolic resin (A) in the above range, the crosslink density when incorporated into the crosslink structure and the coating film fastness of the printed matter are made suitable, and the film flexibility and the blocking property・ The balance with the abrasion resistance is improved. Further, by setting the content to 15% by mass or more, the pigment dispersibility is improved, and the fluidity of the ink can be secured, so that the printability is suitable.

  The alkyd resin (B) comprises vegetable oil modified alkyd resin (b). The vegetable oil modified alkyd resin (b) is incorporated into the cross-linked structure by causing oxidative polymerization of the vegetable oil portion of the vegetable oil modified alkyd resin (b) with the vegetable oil (C) which is another vegetable oil component. As a result, the printed matter can be made to be fast without excessively increasing the crosslinking density, and a printed matter excellent in blocking property and abrasion resistance can be obtained while maintaining the flexibility of the coating film.

  It is preferable that the vegetable oil structural unit which comprises vegetable oil modified | denatured alkyd resin (b) uses the same thing as the vegetable oil (C) mentioned later. Further, from the viewpoint of pigment dispersibility, the amount of the vegetable oil structural unit of the vegetable oil modified alkyd resin (b) is preferably 5 to 60% by mass and 10 to 55% by mass with respect to the total amount of structural units. Is more preferable, and 15 to 50% by mass is particularly preferable.

  The content of the vegetable oil-modified alkyd resin (b) is preferably 5 to 20% by mass, more preferably 5 to 18% by mass, still more preferably 10 to 15% by mass, based on the total amount of the lithographic ink. . By making the content of the vegetable oil modified alkyd resin (b) within the above range, the crosslink density when incorporated in the crosslink structure and the coating film fastness of the printed matter are made suitable, and the film flexibility and blocking property・ The balance with the abrasion resistance is improved. Further, by setting the content to 5% by mass or more, the coating film flexibility becomes suitable, and the fluidity of the ink can be secured. Further, by setting the content to 20% by mass or less, over-emulsification of the ink is suppressed, and the printability is improved.

  In the present invention, an alkyd resin other than the vegetable oil modified alkyd resin (b) may be added as the alkyd resin (B) for blocking property and abrasion resistance. In that case, it is preferable that the blending amount of the vegetable oil modified alkyd resin (b) is 8% by mass or more with respect to the total amount of alkyd resin (B), from the viewpoint of maintaining and improving the blocking property and scratch resistance of printed matter. It is more preferable to set it as mass% or more.

  In the lithographic ink of the present invention, resins other than the above-mentioned rosin modified phenolic resin (A) and alkyd resin (B) can be used in combination as a binder resin. For example, one or more resins selected from the group consisting of styrene maleic resin and maleic resin can be used.

  In the case of the present invention, the total content of the binder resin relative to the total amount of the lithographic ink is 25 from the viewpoint of improving the printability and the adhesion to the substrate while maintaining the film flexibility, blocking property and scratch resistance. The content is preferably 60 to 60% by mass, and more preferably 30 to 50% by mass. The above blending amounts also include the blending amounts of the rosin modified phenolic resin (A) and the alkyd resin (B).

As mentioned above, the lithographic ink of the present invention contains vegetable oil (C). In the present invention, “vegetable oil” refers to triglyceride which is an esterification reaction product of glycerin and a fatty acid, and monoglyceride and diglyceride obtained by the partial transesterification reaction thereof.
In addition, the said fatty acid may contain the saturated fatty acid in the range with which the iodine value of the triglyceride obtained by said esterification reaction or partial transesterification, monoglyceride, and diglyceride falls in the range demonstrated below.

  The iodine value of the vegetable oil (C) used in the present invention is 50 to 140 mg / 100 mg, more preferably 70 to 120 mg / 100 mg. By setting the iodine value within the above range, the crosslink density of the crosslink structure formed by the vegetable oil (C) becomes suitable, and the coating film flexibility is improved. Further, by setting the amount to 50 mg / 100 mg or more, the gloss of the printed matter can be improved, and the stability of the ink on the printing press can be secured. Further, by setting the amount to 140 mg / 100 mg or less, the coating film flexibility becomes preferable.

  An iodine value is a value measured by 2.3.4.1-1996 (Wies-cyclohexane method) of a standard fats-and-oils analysis test method (The Japan Oil Chemistry Association). Specifically, after 0.15 g of the target vegetable oil is dissolved in 10 ml of cyclohexane, 25 ml of Wiss solution is added, and the flask is allowed to stand at room temperature in the dark for about 1 hour. After that, titration is performed with a 0.1 mol / l sodium thiosulfate standard solution, and the iodine value is calculated from the amount of the sodium thiosulfate standard solution added dropwise until the end point is reached.

  As the vegetable oil (C) used in the present invention, palm oil, neem oil, sunflower oil, soy sauce oil, castor oil, castor oil, rice oil, rice bran oil, soybean oil, kapok oil, poppy seed oil, sesame oil, radish oil, corn oil, niger Examples of the oil include an oil, an oil of manto oil, a cottonseed oil, an oil of peanut oil, an oil of coconut oil and the like, but not limited thereto. Among the above, at least one selected from rice oil, rice bran oil, soybean oil, neem oil and sesame oil is preferably selected from the viewpoint of coating film flexibility, and rice bran oil is particularly preferably selected.

  In addition, what carried out the reproduction | regeneration processing to the vegetable oil after being used for manufacture of food-drinks etc. as said vegetable oil (C) (Hereafter, it is also mentioned "regenerated vegetable oil") can also be used. In the present invention, the vegetable oil (C) preferably contains a regenerated vegetable oil. The reason is that by adjusting the conditions of the regeneration treatment, the iodine value can be artificially and easily contained within the above-mentioned preferable range, and the moisture content of the regenerated vegetable oil can be reduced to be contained together with the moisture. And removing impurities that adversely affect the stability and printability of the ink on the printing press. The water content of the regenerated vegetable oil is preferably 0.3% by mass or less.

  In the present invention, monoglycerides and diglycerides obtained by partial transesterification of one or more types of vegetable oils listed above can also be used as the vegetable oil (C). Specifically, saturated fatty acids such as lauric acid, myristic acid, palmitic acid and stearic acid, monovalent saturated fatty acids such as palmitooleic acid, oleic acid and elaidic acid, linoleic acid and γ-linoleic acid Examples thereof include polyunsaturated fatty acids such as α-linolenic acid and the like, but not limited thereto. Among the above, oleic acid and linoleic acid are preferably selected from the viewpoint of improving the balance between the coating film flexibility and the blocking property and the abrasion resistance by being incorporated into the crosslinked structure.

  It is preferable that it is 25-60 mass% with respect to lithographic ink whole quantity, and, as for the compounding quantity of vegetable oil (C) contained in the lithographic ink of this invention, it is especially preferable that it is 35-50 mass%. Within the above range, the flexibility of the resulting printed matter and the drying property and on-machine stability of the ink can be suitably achieved.

  In addition, vegetable oils other than the said vegetable oil (C) may be used for the lithographic ink of this invention. Examples of vegetable oils other than the vegetable oil (C) include palm kernel oil, linseed oil, soy sauce, rapeseed oil and the like.

  The lithographic ink of the invention comprises a pigment. As the pigment, conventionally known organic pigments and / or inorganic pigments can be optionally used. In addition, an extender pigment may be included as the pigment. The compounding amount of the pigment in the present invention (however, the compounding amount of the pigment does not include the compounding amount of the extender pigment) is an amount capable of securing the color developability and sharpness of the printed matter without inhibiting the effect of the present invention. Is preferred. Specifically, the amount is preferably 10 to 40% by mass, particularly preferably 15 to 35% by mass, based on the total amount of the lithographic ink.

  The lithographic ink of the present invention may also contain a gelling agent. Specific examples of the gelling agent include aluminum chelate compounds, metal soaps, and alkanolamines. The amount thereof is preferably 1% by mass or less based on the total amount of the lithographic ink.

  In addition to the above components, the lithographic ink of the present invention appropriately uses various additives such as an existing emulsifier, an emulsion inhibitor, an anti-abrasive agent, an anti-set-off agent, a drying accelerator, and an antioxidant. be able to. The total amount of the compounding amount is preferably 10% by mass or less based on the total amount of the lithographic ink.

  The printing substrate used in the present invention is not particularly limited, and for example, plastic substrates such as polycarbonate, hard vinyl chloride, soft vinyl chloride, polystyrene, foam polystyrene, PMMA, polypropylene, polyethylene, PET, etc. Combination or modified products; paper substrates such as high quality paper, art paper, coated paper, cast coated paper and the like.

  EXAMPLES Hereinafter, the present invention will be more specifically described by way of examples, but the embodiments of the present invention are not limited to these examples.

(Example of synthesis of phenol resin a1 to a6)
Add 1000 parts of phenol or paraalkylphenol, 480 parts of 92% paraformaldehyde, 10 parts of 98% calcium hydroxide and 530 parts of xylene to a 4-neck flask equipped with a stirrer, condenser and thermometer, and then add The temperature was raised to 90 ° C., and reaction was performed for 5 hours. Thereafter, 430 parts of xylene and 250 parts of tap water were added, and 10 parts of 98% sulfuric acid was further dropped. After stirring and standing, the upper layer (xylene solution layer) was taken out, and the non-volatile content was adjusted to obtain a xylene solution (60% non-volatile content) of the resol-type phenolic resin. In addition, the compounds shown in Table 1 below were used as the above-mentioned para-alkylphenol. The obtained resol-type phenol resin was made into phenol resin a1-a6, respectively.

General Formula 1:

(Synthesis Example of Rosin-Modified Phenolic Resin 1 to 10)
After adding 450 parts of gum rosin to a four-necked flask equipped with a stirrer, a condenser with a water separator, a gas inlet tube, and a thermometer, it is heated to 200 ° C. while introducing nitrogen gas to dissolve the gum rosin I did. Next, while maintaining the above temperature, 830 parts of the xylene solution (60% nonvolatile content) of the phenol resin a4 synthesized above was dropped into the flask over 2 hours. After dropping, while the xylene was removed, the temperature in the flask was raised to 250 ° C. and 50 parts of glycerin was further added, and then the polymerization reaction was carried out at 250 ° C. for 17 hours. After completion of the reaction, the mixture in the flask was taken out to obtain a rosin modified phenolic resin 1 having a weight average molecular weight (Mw) of 90,000.

  Also, a rosin-modified phenolic resin is prepared in the same manner as the rosin-modified phenolic resin 1 except that the type of phenolic resin and the polymerization reaction time after the addition of glycerin are changed as shown in Table 2 below. I got 2-10.

  Table 2 also shows the weight average molecular weights of the rosin modified phenolic resins 1 to 10.

(Production example of gel varnish 1 to 20)
A rosin-modified phenolic resin, a vegetable oil, and a gelling agent (ALCH manufactured by Kawaken Fine Chemical Co., Ltd.) in a four-necked flask equipped with a stirrer, a reflux condenser with a water separator, a gas inlet tube, and a thermometer. After charging each with the composition described in Table 3 below, gel varnishes 1 to 20 were manufactured by heating to 190 ° C. while introducing nitrogen gas, and heating and stirring for 1 hour while maintaining the temperature.

(Production of lithographic inks 1 to 30)
Gel varnish, carbon pigment (Mitsubishi Chemical Co., Ltd. Mitsubishi carbon MA7), alkyd resin (B), and vegetable oil are mixed according to the compositions described in Table 4 below, and then kneaded using a three-roll mill according to a conventional method. By dispersing the meat, lithographic inks 1 to 30 were obtained.

  The following evaluation was implemented about the lithographic ink 1-30 manufactured above. The evaluation results are as shown in Table 4.

(Line crack test)
Using a RI tester display color machine (manufactured by Akira Mfg. Co., Ltd.), pearl coat N paper (coated paper manufactured by Mitsubishi Paper Mills Co., Ltd.) was developed such that the paper density was 1.8. In addition, the said paper surface density is the value measured on condition of CIEStatusE and 2 degrees of viewing angles using X-Rite eXact (made by X-Rite). After 24 hours from the printing, the paper was folded and returned to its original state, and the crease was visually observed. And evaluation of a crease was performed by calculating the length of a crack with a percentage to the length of the whole crease. The said calculated value was evaluated in five steps based on the evaluation criteria shown in the following table 5, and made 2 or more practically preferable.

(Blocking test)
Pearl coat N paper (Mitsubishi Paper Co., Ltd. coated paper) was subjected to color development so that the paper density was 1.8, using the above RI tester display color machine. The paper surface density was measured under the same conditions as the ruled line cracking test. After the color development, a white paper (Pearl coat N paper manufactured by Mitsubishi Paper Industries, Ltd.) was applied to the printing surface, and was placed in an environment of 50 ° C. and 80% RH for 24 hours under a load of 1 kg / cm ² . Then, after standing, the blocking property was evaluated by visually checking the adhesion of the ink to the white paper. The evaluation results are based on the evaluation criteria shown in Table 6 below, and are evaluated as 4-step relative evaluation of the lithographic inks 1 to 30 evaluated, and 2 or more are regarded as practically preferable.

(Abrasion resistance test)
Pearl coat N paper (Mitsubishi Paper Co., Ltd. coated paper) was subjected to color development so that the paper density was 1.8, using the above RI tester display color machine. The paper surface density was measured under the same conditions as the ruled line cracking test. After the color development, a white paper (Pearl coated N paper manufactured by Mitsubishi Paper Industries, Ltd.) was applied to the printing surface using a Gakushin type abrasion test machine, and a load of 1 kg was applied for 20 reciprocating friction. After the test, the scratch resistance was evaluated by visually observing the degree of adhesion of the ink to the white paper applied to the printing surface. The evaluation results are based on the evaluation criteria shown in Table 7 below, and are evaluated as 4-step relative evaluation of the lithographic inks 1 to 30 evaluated, and 2 or more are regarded as practically preferable.

  As apparent from Table 4, when a lithographic printing ink composition having the constitution of the present invention was used, it was possible to obtain a print having high flexibility without causing blocking and deterioration of abrasion resistance.

That is, the present invention is a lithographic printing ink composition comprising a rosin modified phenolic resin (A), an alkyd resin (B), a vegetable oil (C), and a pigment,
The weight average molecular weight of the rosin modified phenolic resin (A) is 50,000 to 130,000, and the phenolic structural unit constituting the rosin modified phenolic resin (A) is an alkyl group having 4 to 18 carbon atoms Including
The alkyd resin (B) comprises a vegetable oil modified alkyd resin (b),
The content of the vegetable oil-modified alkyd resin (b) is 5 to 20% by mass in the total amount of the lithographic printing ink composition,
Iodine value of the vegetable oil (C) is, Ri 50~140mg / 100mg der,
The present invention relates to a lithographic printing ink composition in which the content of the vegetable oil (C) is 35 to 60% by mass in the total amount of the lithographic printing ink composition.

That is, the present invention is a lithographic printing ink composition comprising a rosin modified phenolic resin (A), an alkyd resin (B), a vegetable oil (C), and a pigment,
The weight average molecular weight of the rosin modified phenolic resin (A) is 50,000 to 130,000, and the phenolic structural unit constituting the rosin modified phenolic resin (A) is an alkyl group having 4 to 18 carbon atoms Including
The content of the rosin modified phenolic resin (A) is 15 to 25% by mass in the total amount of the lithographic printing ink composition,
The alkyd resin (B) comprises a vegetable oil modified alkyd resin (b),
The content of the vegetable oil-modified alkyd resin (b) is 5 to 20% by mass in the total amount of the lithographic printing ink composition,
The iodine value of the vegetable oil (C) is 50 to 140 mg / 100 mg,
The present invention relates to a lithographic printing ink composition in which the content of the vegetable oil (C) is 35 to 60% by mass in the total amount of the lithographic printing ink composition.

Claims (3)

A lithographic printing ink composition comprising a rosin modified phenolic resin (A), an alkyd resin (B), a vegetable oil (C), and a pigment,
The weight average molecular weight of the rosin modified phenolic resin (A) is 50,000 to 130,000, and the phenolic structural unit constituting the rosin modified phenolic resin (A) is an alkyl group having 4 to 18 carbon atoms Including
The alkyd resin (B) comprises a vegetable oil modified alkyd resin (b),
A lithographic printing ink composition wherein the vegetable oil (C) has an iodine value of 50 to 140 mg / 100 mg.   The lithographic printing ink composition according to claim 1, wherein the content of the vegetable oil modified alkyd resin (b) is 5 to 20% by mass in the total of the lithographic printing ink composition.   A printed matter, wherein the lithographic printing ink composition according to claim 1 is printed on a substrate.