WO2020110501A1 - Ink composition for offset printing, method for producing same, and method for producing printed matter in which same is used - Google Patents

Ink composition for offset printing, method for producing same, and method for producing printed matter in which same is used Download PDF

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Publication number
WO2020110501A1
WO2020110501A1 PCT/JP2019/040949 JP2019040949W WO2020110501A1 WO 2020110501 A1 WO2020110501 A1 WO 2020110501A1 JP 2019040949 W JP2019040949 W JP 2019040949W WO 2020110501 A1 WO2020110501 A1 WO 2020110501A1
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WIPO (PCT)
Prior art keywords
ink composition
varnish
offset printing
oil
binder resin
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Application number
PCT/JP2019/040949
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French (fr)
Japanese (ja)
Inventor
金子 徹
孝 豊岡
靖教 平岡
昇司 佐々木
Original Assignee
サカタインクス株式会社
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Application filed by サカタインクス株式会社 filed Critical サカタインクス株式会社
Priority to CN201980074051.XA priority Critical patent/CN112996866B/en
Publication of WO2020110501A1 publication Critical patent/WO2020110501A1/en

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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00Inks
    • C09D11/02Printing inks
    • C09D11/08Printing inks based on natural resins
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00Inks
    • C09D11/02Printing inks
    • C09D11/10Printing inks based on artificial resins
    • C09D11/102Printing inks based on artificial resins containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
    • C09D11/104Polyesters
    • C09D11/105Alkyd resins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00Inking and printing with a printer's forme
    • B41M1/06Lithographic printing

Definitions

  • the present invention relates to an ink composition for offset printing, a method for producing the same, and a method for producing a printed matter using the same.
  • Offset printing is a printing method that utilizes the property of an oil-based ink composition for offset printing (hereinafter abbreviated as "ink composition” or “ink” as appropriate) to repel water, and printing with unevenness.
  • ink composition oil-based ink composition
  • This printing plate is provided with a lipophilic image part and a hydrophilic non-image part instead of the unevenness.
  • the non-image area of the printing plate is wetted with dampening water to form a water film on the surface, and then the ink composition is supplied to the printing plate.
  • the supplied ink composition repels and does not adhere to the non-image area where the water film is formed, and adheres only to the lipophilic image area.
  • an image is formed by the ink composition on the surface of the printing plate, and then the image is transferred to the blanket and the paper one after another, thereby performing printing.
  • a waterless offset printing method using a printing plate having a non-image area formed of a silicone resin has also been put into practical use.
  • the dampening water does not repel the ink composition to form the non-image area, but the silicone resin repels the ink composition to form the non-image area.
  • waterless offset printing is also a printing method common to offset printing using dampening water. Therefore, in this specification, the term "offset printing" is used as a concept including not only the printing method using dampening water but also the waterless printing method. In waterless offset printing, emulsification of the printing ink composition by dampening water does not occur, so high-quality printing with a small dot gain can be performed.
  • Offset printing has the property that it is suitable for the field of obtaining printed matter with high aesthetic properties and obtaining a large amount of printed matter in a short time, while making the printing plate relatively easy. Therefore, offset printing is widely used in fields such as brochures, posters, calendars, etc., where high aesthetics are required, to fields such as newspapers, magazines, telephone directories, etc., where high-speed and large-volume printing is required. ..
  • the printed matter obtained by offset printing is a state in which the ink composition attached to the surface is sufficiently dry (a state in which the ink composition does not feel tacky to the touch, and this state is called tack-free). If it does not, it will not be possible to postpone it to the subsequent process or distribute it as a product because the set-off will occur when the prints are stacked and the ink will adhere when the prints are touched with fingers. ..
  • the ink composition is dried mainly by an oxidative polymerization method in which components contained in the ink composition are polymerized to become tack-free by oxidation polymerization, and liquid components contained in the ink composition are evaporated to be tack-free.
  • liquid component contained in ink composition penetrates into printing paper to become tack-free, and ultraviolet irradiation causes the components contained in ink composition to polymerize to become high molecular weight and tack-free. It can be classified into the following UV drying method.
  • the sheet-fed printing method is often selected.
  • a high-quality printing paper such as art paper or coated paper or a non-penetrative type printing paper made of a synthetic resin and an ink composition of an oxidation polymerization method are used in combination.
  • the ink composition used here is generally added with a drier made of a metal soap of a transition metal.
  • Patent Document 1 proposes a printing ink composition that avoids the use of cobalt.
  • Patent Document 2 proposes an ink composition that contains vegetable oils and beeswax and aims to reduce the environmental load from the viewpoint of CO 2 emission.
  • a rosin-modified phenolic resin is mainly used as a binder resin in an ink composition for offset printing.
  • the rosin-modified phenolic resin is obtained by reacting a rosin with a resole, which is a condensation polymer of alkylphenol, as a raw material.
  • a resole which is a condensation polymer of alkylphenol
  • the alkylphenol which is a raw material of the resole, may increase the environmental load.
  • the rosin-modified phenolic resin is excellent as a binder resin for ink compositions in terms of printability and the like, and is currently widely used as a raw material for ink compositions.
  • Patent Document 1 Although there is a movement to refrain from using a dryer containing cobalt from the viewpoint of environmental load, instead of this, for example, when using a dryer containing manganese having a smaller environmental load, In reality, the drying property is inferior to the case where a drier containing cobalt is used.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide an ink composition having sufficient printability while using a material having a low environmental load.
  • a resin that is not a resol derivative such as a rosin-modified phenolic resin
  • the settability is improved, and even if a dryer having inferior performance to a dryer containing cobalt is used, a drying property that can be practically used can be obtained, and the present invention has been completed.
  • the present invention has been completed based on the above findings, and specifically provides the following.
  • the present invention provides an ink composition for offset printing containing a pigment, a binder resin, and vegetable oils, wherein the binder resin is not a resol derivative, and 80 g of the binder resin is heated to 200° C. in 120 g of soybean oil. By stirring and dissolving for 30 minutes, a dissolved varnish having n-hexane tolerance of 2 to 7 g/5 g is provided, and a fatty acid alkyl ester of vegetable oil is added to the entire composition as at least a part of the above vegetable oils.
  • the ink composition for offset printing is characterized by containing 10 to 30% by mass.
  • the offset printing ink composition of the present invention preferably contains 2 to 10 mass% of an alkyd resin having an oil length of 50 to 90% with respect to the entire composition.
  • the binder resin is preferably a rosin ester.
  • the offset printing ink composition of the present invention preferably contains no cobalt metal soap.
  • a vegetable oil not a resole derivative
  • 80 g of a vegetable oil, not a resole derivative is dissolved in 120 g of soybean oil heated to 200° C. while stirring for 30 minutes to dissolve n-hexane tolerance of 2 in the oil component containing vegetable oils.
  • a varnish preparation step of preparing a varnish, and a color pigment is added to the varnish and mixed, and the pigment contained in this mixture is dispersed by a dispersing means.
  • a method of producing a printing ink composition for offset printing which comprises a fatty acid alkyl ester of vegetable oil as at least a part of the vegetable oil.
  • the binder resin is preferably a rosin ester.
  • the present invention is also a method for producing a printed matter, which comprises a step of printing using the above ink composition for offset printing.
  • the above printed matter is preferably used for packaging.
  • an ink composition having sufficient printability while using a material having a low environmental load.
  • the ink composition of the present invention is used for offset printing and belongs to the oxidation polymerization type dry type which is preferably used in sheet-fed printing.
  • the ink composition of the present invention does not contain a resole derivative, that is, a rosin-modified phenol resin, and contributes to the realization of offset printing with a reduced environmental load in this respect.
  • the ink composition of the present invention does not contain a resole derivative, and by adopting a binder resin exhibiting a specific value of n-hexane tolerance when dissolved under predetermined conditions, surprisingly good settability is obtained.
  • a dryer containing a transition metal such as manganese, which is not cobalt is used, it is possible to obtain a drying property that can withstand practical use.
  • the ink composition of the present invention contributes to the realization of offset printing with a reduced environmental load.
  • the ink composition of the present invention contains a pigment, a binder resin, and a vegetable oil, and the binder resin is not a resole derivative, and 80 g of the binder resin is stirred in 120 g of soybean oil heated to 200° C. for 30 minutes. Dissolving gives a dissolved varnish having an n-hexane tolerance of 2 to 7 g/5 g, wherein 10 to 30% by mass of the fatty acid alkyl ester of the vegetable oil is used as at least a part of the above vegetable oils. % Is included. Further, the composition of the present invention may contain components such as an alkyd resin and a dryer, if necessary, in addition to the above components. Hereinafter, each component will be described.
  • the pigment examples include a color pigment for imparting tinting strength to the ink composition and a colorless pigment for imparting mainly properties such as viscoelasticity to the ink composition. First, these pigments will be described.
  • the coloring pigment is a component for imparting coloring power to the ink composition.
  • examples of the color pigment include organic and/or inorganic pigments conventionally used in printing ink compositions without particular limitation.
  • coloring pigments examples include yellow pigments such as Disazo Yellow (Pigment Yellow 12, Pigment Yellow 13, Pigment Yellow 17, Pigment Yellow 1), Hansa Yellow, and magenta pigments such as Brilliant Carmine 6B, Lake Red C, and Watching Red.
  • yellow pigments such as Disazo Yellow (Pigment Yellow 12, Pigment Yellow 13, Pigment Yellow 17, Pigment Yellow 1), Hansa Yellow, and magenta pigments such as Brilliant Carmine 6B, Lake Red C, and Watching Red.
  • cyan pigments such as phthalocyanine blue, phthalocyanine green, and alkali blue
  • black pigments such as carbon black
  • fluorescent pigments examples include a metal powder pigment for imparting a metallic color such as gold or silver to the ink composition.
  • metal powder pigments include gold powder, bronze powder, aluminum paste obtained by processing aluminum powder into a paste, and mica powder.
  • the addition amount of the coloring pigment is, for example, about 8 to 30% by mass with respect to the entire ink composition, but is not particularly limited.
  • a pigment of another color may be used in combination, or an ink composition of another color may be added.
  • the colorless pigment is also called an extender pigment and is preferably used for adjusting properties such as viscoelasticity in the ink composition.
  • colorless pigments include clay, talc, kaolinite (kaolin), barium sulfate, calcium carbonate, silicon oxide, bentonite, and titanium oxide.
  • the addition amount of the colorless pigment is, for example, about 0 to 33% by mass with respect to the entire ink composition, but is not particularly limited.
  • the binder resin is a component that functions as a binder that fixes the pigment on the surface of the printing paper, and is also a component that is used to disperse the pigment in the ink composition.
  • the resin used as the binder resin in the present invention is not a resole derivative, but 80 g of the resin is dissolved in 120 g of soybean oil heated to 200° C. with stirring for 30 minutes to obtain n-hexane tolerance of 2 to 7 g/ This gives 5 g of dissolved varnish. Each item will be described below.
  • the binder resin used in the present invention is not a resole derivative. This means that it is not a rosin-modified phenolic resin.
  • the rosin-modified phenol resin is obtained by reacting a resol, which is a condensation polymer of alkylphenol, with rosin as a raw material.
  • Alkylphenol which is a raw material of resole, is feared to function as a so-called environmental hormone, and is recognized as a substance that increases the environmental load.
  • the alkylphenol incorporated into the resin as a resole or rosin-modified phenolic resin no longer functions as an environmental hormone, but there are some concerns that unreacted alkylphenol may remain, and the rosin-modified rosin modified from this material is used as a raw material. There is no need to refrain from using an ink composition containing a phenol resin for printing a packaging material. However, the rosin-modified phenolic resin has extremely excellent properties as a binder resin for an ink composition, and there are almost no resins that substitute for this.
  • a resin having a specific solubility that is, by dissolving 80 g of the resin in 120 g of soybean oil heated to 200° C. with stirring for 30 minutes, n- It has been found that a resin giving a dissolved varnish having a hexane tolerance of 2 to 7 g/5 g can be suitably used as a binder resin for an ink composition by using it in combination with a fatty acid alkyl ester of vegetable oil described later.
  • the resin that dissolves under the above conditions to give a dissolution varnish having an n-hexane tolerance of 2 to 7 g/5 g has considerably lower solubility than the rosin-modified phenol resin generally used for ink compositions. ..
  • a fatty acid alkyl ester of vegetable oil which has a high dissolving power, is used after being dissolved. At this time, a better result can be obtained by dissolving the alkyd resin having an oil length of 50 to 90%, which will be described later, in combination.
  • the present inventor has found that the setting property of the ink composition is improved by using the resin having low solubility as the binder resin as described above.
  • the settability of the ink composition is a measure of how long the printed material becomes tack-free after printing on the paper surface, and when it is high, the drying property is high. The reason for such a result is not always clear.
  • a binder resin having low solubility is likely to precipitate and solidify when the oil component dissolving it is lost from the ink due to oxidative polymerization or permeation into the paper surface. It is speculated that this solidification occurred because the binder resin used had a very low solubility and only a small amount of oil component was lost from the ink composition.
  • the ink composition of the present invention exhibits such high settability, it is possible to obtain a dry state that can be practically used even if a dryer containing a transition metal such as manganese which is not cobalt is used. This suppresses the use of cobalt contained in the dryer and contributes to the realization of printing with a lower environmental load.
  • the binder resin was not a resole derivative, but 80 g of it was dissolved in 120 g of soybean oil heated to 200° C. while stirring for 30 minutes to dissolve it, resulting in a varnish having a n-hexane tolerance of 2 to 7 g/5 g. Anything that gives Examples of such resins include rosin esters and rosin-modified maleic acid resins, and of these, rosin esters are preferred.
  • Rosin ester is a resin obtained by dehydration condensation of rosin and polyhydric alcohol.
  • Rosin includes a compound having a carboxyl group, such as abietic acid, and a compound having such a carboxyl group and a polyhydric alcohol having a plurality of hydroxyl groups are dehydrated and condensed to have a high molecular weight and to be a rosin ester. Become.
  • Some compounds contained in rosin as a raw material have a cis-diene structure such as levopimaric acid.
  • maleic acid modification is carried out by a Diels-Alder addition reaction between rosin and maleic acid, so that the rosin contains a compound rich in a carboxyl group.
  • a dehydration condensation reaction is carried out with a polyhydric alcohol using such a modified rosin, a higher molecular weight rosin ester is obtained.
  • a fatty acid to coexist when the above dehydration condensation reaction is performed, it is possible to variously change the characteristics of the obtained rosin ester.
  • These rosin esters are preferable because they have a high ratio of natural components (biomass) such as rosin in the resin, and in this respect also lead to an ink composition that can realize printing with a low environmental load.
  • polyhydric alcohol used for preparing the rosin ester glycerin, pentaerythritol and the like are preferably exemplified, but other polyhydric alcohols may be used.
  • n-hexane tolerance of the resin in the present invention 80 g of a resin to be measured is prepared and dissolved in 120 g of soybean oil heated to 200° C. by stirring for 30 minutes to prepare a dissolved varnish. After allowing the obtained dissolved varnish to cool to room temperature, 5 g was collected in a beaker, and while maintaining the liquid temperature in the beaker at 25° C., n-hexane was gradually added to the dissolved varnish in the beaker little by little. While adding, the mass (g) of n-hexane required until the liquid in the beaker starts to become cloudy is determined.
  • n-hexane tolerance g/5g.
  • a resin having an n-hexane tolerance of 2 to 7 g/5 g determined by the above procedure is used as the binder resin in the present invention.
  • the n-hexane tolerance is more preferably 2 to 5 g/5 g, further preferably 2 to 3 g/5 g.
  • the binder resin is dissolved or dispersed by being heated together with vegetable oils, etc., which will be described later, and used as a varnish.
  • a gelling agent such as a metal chelate compound or metal soap may be added to the dissolved varnish obtained by dissolving the resin to obtain a gelled varnish. It is preferable to prepare such a gelled varnish and use it for the preparation of the ink composition, since it is possible to impart appropriate viscoelasticity to the ink composition.
  • Vegetable oils include vegetable oils themselves and fatty acid alkyl esters of vegetable oils.
  • the ink composition of the present invention is characterized in that it contains vegetable oils, and at least a part of the vegetable oils contains a fatty acid alkyl ester of vegetable oil in an amount of 10 to 30% by mass based on the entire ink composition.
  • Examples of vegetable oils include soybean oil, cottonseed oil, linseed oil, safflower oil, tung oil, tall oil, dehydrated castor oil, canola oil and other drying oils and semi-drying oils.
  • Examples of fatty acid alkyl esters of vegetable oils include monoalkyl esters of fatty acids derived from the above vegetable oils.
  • the fatty acid constituting the fatty acid monoalkyl ester is preferably exemplified by unsaturated fatty acids having 16 to 20 carbon atoms, and such unsaturated fatty acids include oleic acid, linoleic acid, linolenic acid and eleostearic acid. It is preferably exemplified.
  • the alkyl group constituting the fatty acid monoalkyl ester compound is preferably exemplified by an alkyl group having 1 to 10 carbon atoms, and more specifically, a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, A tert-butyl group, a 2-ethylhexyl group and the like are preferably exemplified.
  • the unsaturated bond portion contained in the vegetable oil is oxidized and polymerized in the ink composition after printing, whereby the ink composition is dried.
  • the fatty acid alkyl ester of the vegetable oil soybean oil fatty acid butyl ester and linseed oil fatty acid butyl ester are preferably mentioned.
  • the content of the fatty acid alkyl ester of vegetable oil in the ink composition is 10 to 30% by mass.
  • the content is more preferably 10 to 20% by mass, and further preferably 15 to 20% by mass.
  • vegetable oil is preferably contained in the ink composition from the viewpoint of improving the drying property of the ink composition.
  • the vegetable oil in this case include soybean oil, linseed oil, tung oil and the like.
  • the content of the vegetable oil in the ink composition is preferably about 15 to 40% by mass, more preferably about 20 to 40% by mass, and even more preferably about 20 to 35% by mass.
  • the ink composition of the present invention preferably contains an alkyd resin.
  • the alkyd resin is a resin prepared by dehydration condensation of a fatty acid and a polyhydric alcohol, and is prepared by adding a polybasic acid such as phthalic anhydride or maleic anhydride in addition to the fatty acid, if necessary.
  • Alkyd resins are often prepared by heating a vegetable oil and a polyhydric alcohol in the presence of a catalyst to simultaneously undergo a transesterification reaction and a dehydration condensation. In the alkyd resin, the ratio (%) of the mass of the fatty acid portion to the mass of the entire alkyd resin is called the oil length.
  • an alkyd resin having an oil length of 50 to 90% is preferably used, and an alkyd resin having an oil length of 60 to 80% is more preferably used.
  • an alkyd resin containing a fatty acid derived from a vegetable oil, that is, a vegetable oil-modified alkyd resin is preferably used.
  • Such alkyd resins are commercially available.
  • the content of the alkyd resin in the ink composition of the present invention is preferably about 2 to 10% by mass with respect to the entire ink composition.
  • Alkyd resin is preferably used together with the binder resin and vegetable oils when preparing the varnish. Thereby, the dissolution of the binder resin having low solubility can be further promoted. Further, the alkyd resin improves the dispersibility of the pigment, and is also preferably used in that respect.
  • the ink composition of the present invention preferably contains a dryer.
  • the dryer has a function of helping the components in the ink composition to undergo oxidative polymerization after printing and promoting the drying of the ink composition.
  • the dryer is made of a transition metal metal soap, and one containing cobalt as a transition metal is said to have the highest drying effect.
  • cobalt remains a concern in terms of increasing harmfulness and environmental load.
  • the ink composition of the present invention has improved settability by using the binder resin described above, and can achieve sufficient dryness without using a dryer containing cobalt. Therefore, the ink composition of the present invention preferably does not contain cobalt metal soap.
  • manganese metal soap can be preferably mentioned.
  • the content of the dryer in the ink composition is preferably about 1 to 5% by mass, more preferably about 1 to 3% by mass.
  • mineral oil may be added to the ink composition of the present invention in addition to the above vegetable oils.
  • examples of the mineral oil include light mineral oil also called a solvent, and heavy mineral oil that is a lubricating oil.
  • Examples of the light mineral oil include non-aromatic petroleum solvents having a boiling point of 160°C or higher, preferably 200°C or higher.
  • Examples of such a non-aromatic petroleum solvent include No. 0 solvent, AF solvent 5, AF solvent 6, AF solvent 7 and the like manufactured by JX Nippon Mining & Energy Corporation.
  • Examples of heavy mineral oils include various lubricating oils that have been classified as spindle oils, machine oils, dynamo oils, cylinder oils, and the like. Among these, it is preferable that the content of the condensed polycyclic aromatic component is suppressed from the viewpoint of conforming to the OSHA standard and EU standard in the United States.
  • Examples of such mineral oils include ink oil H8 and ink oil H35 manufactured by JX Nikko Nisseki Energy Co., Ltd. (all trade names), SNH8, SNH46, SNH220 and SNH540 manufactured by Sankyo Yuka Kogyo Co., Ltd. (All are trade names) and the like.
  • mineral oils can be used alone or in combination of two or more kinds.
  • the content of mineral oil in the ink composition may be, for example, about 0 to 50% by mass with respect to the entire ink composition.
  • antioxidants such as phosphates
  • waxes such as polyethylene wax/olefin wax/Fischer-Tropsch wax, alcohols and the like.
  • a phenol compound such as butylhydroxytoluene and tocopherol acetate can be preferably exemplified, and butylhydroxytoluene can be more preferably exemplified.
  • the content of the antioxidant in the ink composition may be about 0.1 to 2% by mass.
  • the method for producing the ink composition for offset printing of the present invention is to dissolve an oil component containing a vegetable oil, not a resole derivative, in 80 g of soybean oil heated to 200° C. for 80 minutes while stirring 80 g thereof.
  • a step of dissolving a binder resin that gives a dissolving varnish having n-hexane tolerance of 2 to 7 g/5 g is provided, and a varnish preparing step of preparing a varnish and a pigment are added to the varnish and mixed,
  • a kneading step in which the pigment contained in the mixture is made into fine particles by a dispersing means, and a fatty acid alkyl ester of vegetable oil is contained as at least a part of the vegetable oils.
  • the ink composition it was described that a binder resin having a predetermined solubility and vegetable oils, particularly fatty acid alkyl esters of vegetable oils are heated and dissolved to prepare a varnish.
  • the manufacturing method of the invention specifies that such a step is included.
  • the description overlapping with the already described ink composition will be omitted as appropriate.
  • the production method of the present invention includes a varnish preparation step including a step of dissolving the binder resin, which has already been described, in the oil component containing the vegetable oil, which has already been described. At this time, it is necessary to include a fatty acid alkyl ester of vegetable oil as the vegetable oil.
  • the vegetable oil component contained in the oil component includes vegetable oil and fatty acid alkyl ester of vegetable oil.
  • the vegetable oil and the fatty acid alkyl ester of the vegetable oil are as described above.
  • the varnish preparation step with respect to 40 parts by mass of the binder resin, about 15 to 40 parts by mass of vegetable oil, about 15 to 30 parts by mass of fatty acid alkyl ester of vegetable oil, and about 3 to 5% by mass of alkyd resin are used.
  • the dissolved varnish may be prepared by mixing the respective components in proportion and dissolving the binder resin at 100 to 150° C. for 30 to 90 minutes while stirring.
  • the obtained dissolved varnish may be used as it is for the preparation of an ink composition, or a gelling agent such as a metal chelate compound or a metal soap may be added and further reacted under heating to form a gel varnish.
  • a gelling agent such as a metal chelate compound or a metal soap
  • ALCH aluminum ethyl acetoacetate diisopropylate
  • the gelling varnish is prepared by adding the gelling agent to the dissolved varnish and then reacting at 100 to 150° C. for 30 to 90 minutes.
  • the varnish prepared in the varnish preparation step is subjected to the kneading process.
  • a pigment is added to the varnish and mixed, and the pigment contained in this mixture is made into fine particles by a dispersing means. That is, the pigment described above is added to the varnish, and the pigment is dispersed by kneading with a bead mill or a three-roll mill. Thereafter, an ink composition is prepared by adding a dryer, various components (antioxidants, alcohols, waxes, etc.) and the like, if necessary, and further adding an oil component such as vegetable oil to adjust the viscosity.
  • the viscosity of the ink composition may be, for example, 10 to 50 Pa ⁇ s at 25° C. by a Raleigh viscometer, but is not particularly limited.
  • the method for producing a printed matter according to the present invention is characterized by including a step of printing using the ink composition for offset printing according to the present invention.
  • the ink composition of the present invention has a high ratio of naturally derived components, and does not include a rosin-modified phenol resin made from a large environmentally-friendly alkylphenol as a raw material, or a similarly environmentally-friendly cobalt dryer, It is characterized by a lower environmental load than conventional products.
  • printing with a smaller environmental load can be realized, and the printed matter obtained in this way also has a smaller environmental load.
  • a rosin-modified phenolic resin using an alkylphenol as a raw material and a printed matter printed with an ink composition that does not contain a cobalt drier, which may be harmful, are particularly strongly required in the packaging field where safety is important. is there. Therefore, the printed matter produced using the ink composition of the present invention is extremely useful for packaging.
  • part means a mass part
  • % means the mass %
  • varnish 1 In a four-necked flask equipped with a cooling pipe, a thermometer and a stirrer, 41.4 parts of rosin ester (Harima Kasei Co., Ltd., Harrier Star 619CI), vegetable oil modified alkyd resin (Toshin Yushi Co., Ltd., TOKYD-81S). -NV) 4.4 parts, 18.2 parts of butyl ester of soybean oil fatty acid and 35.4 parts of soybean oil were charged, the temperature was raised to 130°C, and the same temperature was maintained for 50 minutes to dissolve the resin.
  • rosin ester Hardima Kasei Co., Ltd., Harrier Star 619CI
  • vegetable oil modified alkyd resin Toshin Yushi Co., Ltd., TOKYD-81S.
  • -NV 4.4 parts, 18.2 parts of butyl ester of soybean oil fatty acid and 35.4 parts of soybean oil were charged, the temperature was raised to 130°C, and the same temperature was maintained for 50 minutes to dissolve the resin.
  • n-hexane tolerance value of the rosin ester used in the preparation of Varnish 6 was 0.0 (g/5g). That is, 80 g of this rosin ester did not dissolve in 120 g of soybean oil at 200°C.
  • Alkyd resin is a vegetable oil-modified alkyd resin (TOKYD-81S-NV manufactured by Toshin Yushi Co., Ltd.). ) 4.1 parts, 17.0 parts of butyl ester of soybean oil fatty acid and 39.9 parts of soybean oil were charged), "wax” is polyethylene wax, and "Co dryer” is a cobalt-based metal dryer. Yes, “Mn dryer” is a manganese-based metal dryer, and “fatty acid ester” is soybean oil fatty acid butyl ester.
  • Equivalent to the standard reference example (Reference example 1 or 2)
  • Inferior to the standard reference example (Reference example 1 or 2), but within the practical range
  • Standard reference example (Reference example Remarkably inferior to 1 or 2) and out of practical range
  • the time required for the ink to not adhere to the coated paper was defined as the paper surface drying time.
  • the evaluation criteria are as follows, and the results are shown in the paper surface dryness column of Table 2. ⁇ : Equivalent to the standard reference example (Reference example 1 or 2) ⁇ : Inferior to the standard reference example (Reference example 1 or 2), but within the practical range ⁇ : Standard reference example (Reference example Remarkably inferior to 1 or 2) and out of practical range
  • Equivalent to the standard reference example (Reference example 1 or 2)
  • Inferior to the standard reference example (Reference example 1 or 2), but within the practical range
  • Standard reference example (Reference example Remarkably inferior to 1 or 2) and out of practical range
  • Equivalent to the standard reference example (Reference example 1 or 2)
  • Inferior to the standard reference example (Reference example 1 or 2), but within the practical range
  • Standard reference example (Reference example Remarkably inferior to 1 or 2) and out of practical range
  • the ink composition of the present invention does not contain the rosin-modified phenolic resin (resole derivative), it is equivalent to the conventional type ink composition containing the rosin-modified phenolic resin (Reference Example 1). It can be seen that printability is achieved. From this, it can be understood that the ink composition of the present invention has sufficient printability while using a material having a low environmental load.

Abstract

[Problem] To provide an ink composition in which adequate printability is obtained while using a material having a low environmental impact. [Solution] There is used an ink composition for offset printing that includes a pigment, a binder resin, and vegetable oils, wherein the ink composition for offset printing is characterized in that: the binder resin is not a resol derivative, and is such that dissolving 80 g of the binder resin by stirring for 30 minutes in 120 g of soybean oil heated to 200°C yields a dissolving varnish having an n-hexane tolerance of 2-7 g/5 g; and 10-30 mass% of a fatty acid alkyl ester of a vegetable oil is included relative to the entire composition as at least part of the vegetable oils.

Description

オフセット印刷用インキ組成物及びその製造方法、並びにそれを用いた印刷物の製造方法Ink composition for offset printing, method for producing the same, and method for producing printed matter using the same
 本発明は、オフセット印刷用インキ組成物及びその製造方法、並びにそれを用いた印刷物の製造方法に関する。 The present invention relates to an ink composition for offset printing, a method for producing the same, and a method for producing a printed matter using the same.
 オフセット印刷は、油性であるオフセット印刷用インキ組成物(以下、「インキ組成物」又は「インキ」と適宜省略する。)が水に反発する性質を利用した印刷方式であり、凹凸を備えた印刷版を用いる凸版印刷方式とは異なり、凹凸のない印刷版を用いることを特徴とする。この印刷版は、凹凸の代わりに親油性の画像部と親水性の非画像部とを備える。そして印刷に際しては、まず、湿し水によって印刷版の非画像部が湿潤されてその表面に水膜が形成され、次いでインキ組成物が印刷版に供給される。このとき、供給されたインキ組成物は、水膜の形成された非画像部には反発して付着せず、親油性の画像部のみに付着する。こうして、印刷版の表面にインキ組成物による画像が形成され、次いでそれがブランケット及び紙に順次転移することにより印刷が行われる。 Offset printing is a printing method that utilizes the property of an oil-based ink composition for offset printing (hereinafter abbreviated as "ink composition" or "ink" as appropriate) to repel water, and printing with unevenness. Unlike the letterpress printing method using a plate, it is characterized by using a printing plate having no unevenness. This printing plate is provided with a lipophilic image part and a hydrophilic non-image part instead of the unevenness. When printing, first, the non-image area of the printing plate is wetted with dampening water to form a water film on the surface, and then the ink composition is supplied to the printing plate. At this time, the supplied ink composition repels and does not adhere to the non-image area where the water film is formed, and adheres only to the lipophilic image area. Thus, an image is formed by the ink composition on the surface of the printing plate, and then the image is transferred to the blanket and the paper one after another, thereby performing printing.
 また、上記のように湿し水を用いたオフセット印刷の他に、シリコーン樹脂により非画像部が形成された印刷版を用いた水無しオフセット印刷方式も実用化されている。この印刷方式では、湿し水がインキ組成物と反発して非画像部を形成するのではなく、シリコーン樹脂がインキ組成物と反発して非画像部となる。こうした点を除けば、水無しオフセット印刷もまた、湿し水を用いたオフセット印刷と共通の印刷方式である。そこで、本明細書では、湿し水を用いた印刷方式のみならず、水無し印刷方式をも含めた概念として「オフセット印刷」という用語を用いる。なお、水無しオフセット印刷では、湿し水による印刷インキ組成物の乳化が起こらないので、ドットゲインの小さな高品位印刷を行うことができるとされる。 In addition to the offset printing using dampening water as described above, a waterless offset printing method using a printing plate having a non-image area formed of a silicone resin has also been put into practical use. In this printing method, the dampening water does not repel the ink composition to form the non-image area, but the silicone resin repels the ink composition to form the non-image area. Except for these points, waterless offset printing is also a printing method common to offset printing using dampening water. Therefore, in this specification, the term "offset printing" is used as a concept including not only the printing method using dampening water but also the waterless printing method. In waterless offset printing, emulsification of the printing ink composition by dampening water does not occur, so high-quality printing with a small dot gain can be performed.
 オフセット印刷は、印刷版の作製が比較的簡単でありながら、高い美粧性を備えた印刷物を得たり、大量の印刷物を短時間で得たりする分野に適するという特性を備える。そこで、オフセット印刷は、パンフレット、ポスター、カレンダー等といった高い美粧性が要求される分野から、新聞、雑誌、電話帳等といった高速かつ大量に印刷されることが要求される分野まで広く利用されている。 Offset printing has the property that it is suitable for the field of obtaining printed matter with high aesthetic properties and obtaining a large amount of printed matter in a short time, while making the printing plate relatively easy. Therefore, offset printing is widely used in fields such as brochures, posters, calendars, etc., where high aesthetics are required, to fields such as newspapers, magazines, telephone directories, etc., where high-speed and large-volume printing is required. ..
 ところで、オフセット印刷により得られた印刷物は、その表面に付着しているインキ組成物が十分に乾燥した状態(触れてもべとつきを感じない状態のことをいい、この状態のことをタックフリーと呼ぶ。)とならなければ、印刷物を重ねた際に裏移りを生じたり、指で印刷物に触れた際にインキが付着したりするので、後工程に回したり、商品として流通させたりすることができない。インキ組成物の乾燥は、主として、インキ組成物に含まれる成分が酸化重合することにより高分子量化してタックフリーとなる酸化重合方式、インキ組成物に含まれる液体成分が蒸発してタックフリーとなる蒸発乾燥方式、インキ組成物に含まれる液体成分が印刷用紙に浸透してタックフリーとなる浸透乾燥方式、及び紫外線照射によりインキ組成物に含まれる成分が重合することで高分子量化してタックフリーとなるUV乾燥方式に分類できる。 By the way, the printed matter obtained by offset printing is a state in which the ink composition attached to the surface is sufficiently dry (a state in which the ink composition does not feel tacky to the touch, and this state is called tack-free). If it does not, it will not be possible to postpone it to the subsequent process or distribute it as a product because the set-off will occur when the prints are stacked and the ink will adhere when the prints are touched with fingers. .. The ink composition is dried mainly by an oxidative polymerization method in which components contained in the ink composition are polymerized to become tack-free by oxidation polymerization, and liquid components contained in the ink composition are evaporated to be tack-free. Evaporative drying method, liquid component contained in ink composition penetrates into printing paper to become tack-free, and ultraviolet irradiation causes the components contained in ink composition to polymerize to become high molecular weight and tack-free. It can be classified into the following UV drying method.
 ポスターや商品パッケージ等のように、高品位な印刷物を必要とする印刷を行う場合には、枚葉印刷方式が選択されることが多い。この印刷方式では、アート紙やコート紙のような高品位印刷用紙や合成樹脂からなる非浸透タイプの印刷用紙と、酸化重合方式のインキ組成物とが組み合わせて用いられる。そして、ここで用いられるインキ組成物には、印刷後に酸化重合を促進させて早期にタックフリーを実現させるために、遷移金属の金属石鹸からなるドライヤーが添加されるのが一般的である。このときに用いられるドライヤーとしては、遷移金属としてコバルトを含むものが特に酸化重合を促進させる効果が高いとされるが、近年、コバルトの有害性や環境負荷を増加させる点が注目され、これの使用を避ける動きもある。このような一例として、例えば特許文献1には、コバルトの使用を避けた印刷インキ組成物が提案されている。 When printing high-quality printed matter such as posters and product packages, the sheet-fed printing method is often selected. In this printing method, a high-quality printing paper such as art paper or coated paper or a non-penetrative type printing paper made of a synthetic resin and an ink composition of an oxidation polymerization method are used in combination. And, in order to promote oxidative polymerization after printing and to realize tack-free in an early stage, the ink composition used here is generally added with a drier made of a metal soap of a transition metal. As the dryer used at this time, those containing cobalt as a transition metal are said to have a particularly high effect of promoting oxidative polymerization, but in recent years, attention has been paid to the fact that the harmfulness and environmental load of cobalt are increased. There are also movements to avoid using it. As one example of this, for example, Patent Document 1 proposes a printing ink composition that avoids the use of cobalt.
 また、環境負荷を低減させるとの観点から、近年では、天然由来の原料を積極的に用いたインキ組成物も提案されている。このような例として、例えば特許文献2には、植物油類とミツロウとを含有し、CO排出量という観点から環境負荷の低減を目指したインキ組成物が提案されている。 Also, from the viewpoint of reducing the environmental load, an ink composition in which a naturally-derived raw material is positively used has been proposed in recent years. As such an example, for example, Patent Document 2 proposes an ink composition that contains vegetable oils and beeswax and aims to reduce the environmental load from the viewpoint of CO 2 emission.
特開2004-256623号公報JP, 2004-256623, A 特開2016-166266号公報JP, 2016-166266, A
 インキ組成物中の油成分を植物油等の天然由来のものとすることで環境負荷を低減させる試みは、特許文献2等に示されるように、広く行われている。しかしながら、オフセット印刷用のインキ組成物におけるバインダー樹脂として、ロジン変性フェノール樹脂が主として用いられる状況は過去も現在も変わらない。ロジン変性フェノール樹脂は、アルキルフェノールの縮重合体であるレゾールとロジン等とを原料として反応させてなるもので、これらの原料のうち、ロジンは天然物だが、原料の多くの部分を占めるレゾール等は天然物ではない。また、レゾールの原料となるアルキルフェノールは、環境負荷を増大させる懸念も指摘されている。それでも、ロジン変性フェノール樹脂は、印刷適性等の面でインキ組成物用のバインダー樹脂として優秀であり、インキ組成物の原料として広く用いられているのが現状である。 As shown in Patent Document 2 and the like, attempts have been widely made to reduce the environmental load by using a naturally derived oil component such as a vegetable oil in the ink composition. However, the situation in which a rosin-modified phenolic resin is mainly used as a binder resin in an ink composition for offset printing has not changed in the past or present. The rosin-modified phenolic resin is obtained by reacting a rosin with a resole, which is a condensation polymer of alkylphenol, as a raw material. Among these raw materials, rosin is a natural product, but resole, which occupies most of the raw material, is not Not a natural product. Further, it has been pointed out that the alkylphenol, which is a raw material of the resole, may increase the environmental load. Nevertheless, the rosin-modified phenolic resin is excellent as a binder resin for ink compositions in terms of printability and the like, and is currently widely used as a raw material for ink compositions.
 また、特許文献1に示すように、環境負荷の観点からコバルトを含むドライヤーの使用を控える動きはあるものの、これに代えて、例えばより環境負荷の小さいマンガンを含むドライヤーを用いた場合には、コバルトを含むドライヤーを用いた場合よりも乾燥性の面で劣るのが実情である。 Further, as shown in Patent Document 1, although there is a movement to refrain from using a dryer containing cobalt from the viewpoint of environmental load, instead of this, for example, when using a dryer containing manganese having a smaller environmental load, In reality, the drying property is inferior to the case where a drier containing cobalt is used.
 本発明は、以上の状況に鑑みてなされたものであり、環境負荷の小さい材料を用いながら、十分な印刷適性の得られるインキ組成物を提供することを目的とする。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an ink composition having sufficient printability while using a material having a low environmental load.
 本発明者らは、以上の課題を解決するために鋭意検討を重ねた結果、ロジン変性フェノール樹脂のようなレゾール誘導体でない樹脂であっても、所定の条件で溶解させたときのn-ヘキサントレランスが特定の値を示すものであれば、これを植物油の脂肪酸アルキルエステルと組み合わせて用いることにより、十分にインキ組成物用のバインダー樹脂として用いることが可能であるばかりか、これをバインダー樹脂として用いると、セット性が向上し、コバルトを含むドライヤーよりも性能の劣るドライヤーを用いても実用に耐えうる乾燥性が得られることを見出し、本発明を完成するに至った。本発明は、以上の知見に基づいて完成されたものであり、具体的には以下のようなものを提供する。 As a result of intensive studies to solve the above problems, the present inventors have found that even a resin that is not a resol derivative, such as a rosin-modified phenolic resin, has n-hexane tolerance when dissolved under predetermined conditions. Shows a specific value, by using it in combination with a fatty acid alkyl ester of vegetable oil, not only can it be sufficiently used as a binder resin for an ink composition, but also it can be used as a binder resin. Then, it was found that the settability is improved, and even if a dryer having inferior performance to a dryer containing cobalt is used, a drying property that can be practically used can be obtained, and the present invention has been completed. The present invention has been completed based on the above findings, and specifically provides the following.
 本発明は、顔料、バインダー樹脂、及び植物油類を含むオフセット印刷用インキ組成物であって、上記バインダー樹脂が、レゾール誘導体でなく、その80gを200℃に加温された120gの大豆油中で30分間撹拌されて溶解することで、n-ヘキサントレランスが2~7g/5gである溶解ワニスを与えるものであり、上記植物油類の少なくとも一部として、植物油の脂肪酸アルキルエステルを組成物全体に対して10~30質量%含むことを特徴とするオフセット印刷用インキ組成物である。 The present invention provides an ink composition for offset printing containing a pigment, a binder resin, and vegetable oils, wherein the binder resin is not a resol derivative, and 80 g of the binder resin is heated to 200° C. in 120 g of soybean oil. By stirring and dissolving for 30 minutes, a dissolved varnish having n-hexane tolerance of 2 to 7 g/5 g is provided, and a fatty acid alkyl ester of vegetable oil is added to the entire composition as at least a part of the above vegetable oils. The ink composition for offset printing is characterized by containing 10 to 30% by mass.
 本発明のオフセット印刷用インキ組成物は、油長50~90%のアルキッド樹脂を組成物全体に対して2~10質量%含むことが好ましい。 The offset printing ink composition of the present invention preferably contains 2 to 10 mass% of an alkyd resin having an oil length of 50 to 90% with respect to the entire composition.
 上記バインダー樹脂は、ロジンエステルであることが好ましい。 The binder resin is preferably a rosin ester.
 本発明のオフセット印刷用インキ組成物は、コバルト金属石鹸を含有しないことが好ましい。 The offset printing ink composition of the present invention preferably contains no cobalt metal soap.
 本発明は、植物油類を含有する油成分に、レゾール誘導体でなく、その80gを200℃に加温された120gの大豆油中で30分間撹拌されて溶解することで、n-ヘキサントレランスが2~7g/5gである溶解ワニスを与えるバインダー樹脂を溶解させる工程を備え、ワニスを調製するワニス調製工程と、上記ワニスに着色顔料を添加して混合し、この混合物に含まれる顔料を分散手段により微粒子化させる練肉工程と、を備え、上記植物油類の少なくとも一部として植物油の脂肪酸アルキルエステルを含むオフセット印刷用印刷インキ組成物の製造方法でもある。 According to the present invention, 80 g of a vegetable oil, not a resole derivative, is dissolved in 120 g of soybean oil heated to 200° C. while stirring for 30 minutes to dissolve n-hexane tolerance of 2 in the oil component containing vegetable oils. A varnish preparation step of preparing a varnish, and a color pigment is added to the varnish and mixed, and the pigment contained in this mixture is dispersed by a dispersing means. And a method of producing a printing ink composition for offset printing, which comprises a fatty acid alkyl ester of vegetable oil as at least a part of the vegetable oil.
 上記ワニス調製工程にてワニスを調製する際に、油長50~90%のアルキッド樹脂を添加することが好ましい。 When preparing a varnish in the above varnish preparation step, it is preferable to add an alkyd resin having an oil length of 50 to 90%.
 上記バインダー樹脂は、ロジンエステルであることが好ましい。 The binder resin is preferably a rosin ester.
 本発明は、上記オフセット印刷用インキ組成物を用いて印刷を行う工程を含むことを特徴とする印刷物の製造方法でもある。 The present invention is also a method for producing a printed matter, which comprises a step of printing using the above ink composition for offset printing.
 上記印刷物は、包装用として好ましく用いられる。 The above printed matter is preferably used for packaging.
 本発明によれば、環境負荷の小さい材料を用いながら、十分な印刷適性の得られるインキ組成物が提供される。 According to the present invention, there is provided an ink composition having sufficient printability while using a material having a low environmental load.
 以下、本発明のオフセット印刷用インキ組成物の一実施形態、本発明のオフセット印刷用インキ組成物の製造方法の一実施態様、及び本発明の印刷物の製造方法の一実施態様について説明する。なお、本発明は、以下の実施形態及び実施態様に限定されるものでなく、本発明の範囲において適宜変更を加えて実施することができる。 Hereinafter, one embodiment of the ink composition for offset printing of the present invention, one embodiment of the method for producing the ink composition for offset printing of the present invention, and one embodiment of the method for producing the printed material of the present invention will be described. It should be noted that the present invention is not limited to the following embodiments and modes, and can be implemented with appropriate modifications within the scope of the present invention.
<オフセット印刷用インキ組成物>
 まずは、本発明のオフセット印刷用インキ組成物(以下、「本発明のインキ組成物」等と適宜省略する。)の一実施形態について説明する。本発明のインキ組成物は、オフセット印刷用として使用されるものであり、枚葉印刷において好適に用いられる酸化重合型の乾燥タイプに属する。本発明のインキ組成物は、レゾール誘導体、すなわちロジン変性フェノール樹脂を含まず、この点で環境負荷の低減したオフセット印刷の実現に貢献するものである。また、本発明のインキ組成物は、レゾール誘導体を含まず、所定の条件で溶解させたときのn-ヘキサントレランスが特定の値を示すバインダー樹脂を採用することにより、意外にも良好なセット性を示すようになり、コバルトでない、マンガン等の遷移金属を含むドライヤーを用いても実用に耐えうる乾燥性を得ることができる。この点でも、本発明のインキ組成物は、環境負荷の低減したオフセット印刷の実現に貢献するものである。
<Ink composition for offset printing>
First, an embodiment of the ink composition for offset printing of the present invention (hereinafter, appropriately abbreviated as “ink composition of the present invention”) will be described. The ink composition of the present invention is used for offset printing and belongs to the oxidation polymerization type dry type which is preferably used in sheet-fed printing. The ink composition of the present invention does not contain a resole derivative, that is, a rosin-modified phenol resin, and contributes to the realization of offset printing with a reduced environmental load in this respect. Moreover, the ink composition of the present invention does not contain a resole derivative, and by adopting a binder resin exhibiting a specific value of n-hexane tolerance when dissolved under predetermined conditions, surprisingly good settability is obtained. As a result, even if a dryer containing a transition metal such as manganese, which is not cobalt, is used, it is possible to obtain a drying property that can withstand practical use. Also in this respect, the ink composition of the present invention contributes to the realization of offset printing with a reduced environmental load.
 本発明のインキ組成物は、顔料、バインダー樹脂、及び植物油類を含み、上記バインダー樹脂が、レゾール誘導体でなく、その80gを200℃に加温された120gの大豆油中で30分間撹拌されて溶解することで、n-ヘキサントレランスが2~7g/5gである溶解ワニスを与えるものであり、上記植物油類の少なくとも一部として、植物油の脂肪酸アルキルエステルを組成物全体に対して10~30質量%含むことを特徴とする。また、本発明の組成物は、上記の各成分の他にも、アルキッド樹脂、ドライヤー等の成分を必要に応じて含むことができる。以下、各成分について説明する。 The ink composition of the present invention contains a pigment, a binder resin, and a vegetable oil, and the binder resin is not a resole derivative, and 80 g of the binder resin is stirred in 120 g of soybean oil heated to 200° C. for 30 minutes. Dissolving gives a dissolved varnish having an n-hexane tolerance of 2 to 7 g/5 g, wherein 10 to 30% by mass of the fatty acid alkyl ester of the vegetable oil is used as at least a part of the above vegetable oils. % Is included. Further, the composition of the present invention may contain components such as an alkyd resin and a dryer, if necessary, in addition to the above components. Hereinafter, each component will be described.
[顔料]
 顔料としては、インキ組成物に着色力を付与するための着色顔料と、インキ組成物に主として粘弾性等といった特性を付与するための無色顔料とが挙げられる。まずは、これらの顔料について説明する。
[Pigment]
Examples of the pigment include a color pigment for imparting tinting strength to the ink composition and a colorless pigment for imparting mainly properties such as viscoelasticity to the ink composition. First, these pigments will be described.
 着色顔料は、インキ組成物に着色力を付与するための成分である。着色顔料としては、従来から印刷インキ組成物に使用される有機及び/又は無機顔料を特に制限無く挙げることができる。 The coloring pigment is a component for imparting coloring power to the ink composition. Examples of the color pigment include organic and/or inorganic pigments conventionally used in printing ink compositions without particular limitation.
 このような着色顔料としては、ジスアゾイエロー(ピグメントイエロー12、ピグメントイエロー13、ピグメントイエロー17、ピグメントイエロー1)、ハンザイエロー等のイエロー顔料、ブリリアントカーミン6B、レーキレッドC、ウオッチングレッド等のマゼンタ顔料、フタロシアニンブルー、フタロシアニングリーン、アルカリブルー等のシアン顔料、カーボンブラック等の黒色顔料、蛍光顔料等が例示される。また、インキ組成物に金色や銀色等の金属色を付与するための金属粉顔料も本発明では着色顔料として扱う。このような金属粉顔料としては、金粉、ブロンズパウダー、アルミニウムパウダーをペースト状に加工したアルミニウムペースト、雲母パウダー等を挙げることができる。 Examples of such coloring pigments include yellow pigments such as Disazo Yellow (Pigment Yellow 12, Pigment Yellow 13, Pigment Yellow 17, Pigment Yellow 1), Hansa Yellow, and magenta pigments such as Brilliant Carmine 6B, Lake Red C, and Watching Red. Examples include cyan pigments such as phthalocyanine blue, phthalocyanine green, and alkali blue, black pigments such as carbon black, and fluorescent pigments. Further, a metal powder pigment for imparting a metallic color such as gold or silver to the ink composition is also treated as a color pigment in the present invention. Examples of such metal powder pigments include gold powder, bronze powder, aluminum paste obtained by processing aluminum powder into a paste, and mica powder.
 着色顔料の添加量としては、インキ組成物の全体に対して8~30質量%程度が例示されるが、特に限定されない。なお、イエロー顔料を使用してイエローインキ組成物を、マゼンタ顔料を使用してマゼンタインキ組成物を、シアン顔料を使用してシアンインキ組成物を、黒色顔料を使用してブラックインキ組成物をそれぞれ調製する場合には、補色として、他の色の顔料を併用したり、他の色のインキ組成物を添加したりすることも可能である。 The addition amount of the coloring pigment is, for example, about 8 to 30% by mass with respect to the entire ink composition, but is not particularly limited. A yellow ink composition using a yellow pigment, a magenta ink composition using a magenta pigment, a cyan ink composition using a cyan pigment, and a black ink composition using a black pigment, respectively. In the case of preparation, as a complementary color, a pigment of another color may be used in combination, or an ink composition of another color may be added.
 無色顔料は、体質顔料とも呼ばれ、インキ組成物における粘弾性等といった特性を調節するために好ましく使用される。無色顔料としては、クレー、タルク、カオリナイト(カオリン)、硫酸バリウム、炭酸カルシウム、酸化ケイ素、ベントナイト、酸化チタン等が例示される。無色顔料の添加量としては、インキ組成物全体に対して0~33質量%程度が例示されるが、特に限定されない。 The colorless pigment is also called an extender pigment and is preferably used for adjusting properties such as viscoelasticity in the ink composition. Examples of colorless pigments include clay, talc, kaolinite (kaolin), barium sulfate, calcium carbonate, silicon oxide, bentonite, and titanium oxide. The addition amount of the colorless pigment is, for example, about 0 to 33% by mass with respect to the entire ink composition, but is not particularly limited.
[バインダー樹脂]
 バインダー樹脂は、印刷用紙の表面で上記顔料を固定するバインダーとして機能する成分であり、また、上記顔料をインキ組成物中に分散させるために用いられる成分でもある。本発明でバインダー樹脂として用いる樹脂は、レゾール誘導体でなく、その80gを200℃に加温された120gの大豆油中で30分間撹拌されて溶解することで、n-ヘキサントレランスが2~7g/5gである溶解ワニスを与えるものである。以下、各項目について説明する。
[Binder resin]
The binder resin is a component that functions as a binder that fixes the pigment on the surface of the printing paper, and is also a component that is used to disperse the pigment in the ink composition. The resin used as the binder resin in the present invention is not a resole derivative, but 80 g of the resin is dissolved in 120 g of soybean oil heated to 200° C. with stirring for 30 minutes to obtain n-hexane tolerance of 2 to 7 g/ This gives 5 g of dissolved varnish. Each item will be described below.
 本発明で用いるバインダー樹脂は、レゾール誘導体でない。これは、ロジン変性フェノール樹脂でないことを意味している。既に述べた通り、ロジン変性フェノール樹脂は、アルキルフェノールの縮重合体であるレゾールとロジン等とを原料として反応させてなるものである。そして、レゾールの原料となるアルキルフェノールは、いわゆる環境ホルモンとして機能することが懸念されており、環境負荷を増大させる物質として認識されている。レゾールやロジン変性フェノール樹脂となって樹脂に組み込まれたアルキルフェノールは、もはや環境ホルモンとして機能するものではないが、未反応のアルキルフェノールが残留することを懸念する声もあり、これを原料とするロジン変性フェノール樹脂を用いたインキ組成物を包装材の印刷に用いるのを控えることへの要望も無いことはない。しかしながら、ロジン変性フェノール樹脂は、インキ組成物用のバインダー樹脂として極めて優れた特性を備えており、これを代替する樹脂が殆ど無いのが実情である。 The binder resin used in the present invention is not a resole derivative. This means that it is not a rosin-modified phenolic resin. As described above, the rosin-modified phenol resin is obtained by reacting a resol, which is a condensation polymer of alkylphenol, with rosin as a raw material. Alkylphenol, which is a raw material of resole, is feared to function as a so-called environmental hormone, and is recognized as a substance that increases the environmental load. The alkylphenol incorporated into the resin as a resole or rosin-modified phenolic resin no longer functions as an environmental hormone, but there are some concerns that unreacted alkylphenol may remain, and the rosin-modified rosin modified from this material is used as a raw material. There is no need to refrain from using an ink composition containing a phenol resin for printing a packaging material. However, the rosin-modified phenolic resin has extremely excellent properties as a binder resin for an ink composition, and there are almost no resins that substitute for this.
 このような状況において、本発明者は、特定の溶解性を備えた樹脂、すなわち、その80gを200℃に加温された120gの大豆油中で30分間撹拌されて溶解することで、n-ヘキサントレランスが2~7g/5gである溶解ワニスを与える樹脂を、後述する植物油の脂肪酸アルキルエステルと組み合わせて用いることにより、インキ組成物用のバインダー樹脂として好適に用いることができることを見出した。上記の条件で溶解し、n-ヘキサントレランスが2~7g/5gである溶解ワニスを与える樹脂は、インキ組成物用として一般に用いられるロジン変性フェノール樹脂に比較してかなり溶解性の低いものである。本発明では、溶解力の高い、植物油の脂肪酸アルキルエステルによりこれを溶解させて用いる。この際、後述する、油長50~90%のアルキッド樹脂と組み合わせて溶解させることにより、さらに良好な結果が得られる。 In such a situation, the present inventor has developed a resin having a specific solubility, that is, by dissolving 80 g of the resin in 120 g of soybean oil heated to 200° C. with stirring for 30 minutes, n- It has been found that a resin giving a dissolved varnish having a hexane tolerance of 2 to 7 g/5 g can be suitably used as a binder resin for an ink composition by using it in combination with a fatty acid alkyl ester of vegetable oil described later. The resin that dissolves under the above conditions to give a dissolution varnish having an n-hexane tolerance of 2 to 7 g/5 g has considerably lower solubility than the rosin-modified phenol resin generally used for ink compositions. .. In the present invention, a fatty acid alkyl ester of vegetable oil, which has a high dissolving power, is used after being dissolved. At this time, a better result can be obtained by dissolving the alkyd resin having an oil length of 50 to 90%, which will be described later, in combination.
 さらに、本発明者は、上記のように溶解性の低い樹脂をバインダー樹脂として用いることにより、インキ組成物のセット性が向上することを見出した。インキ組成物のセット性とは、紙面への印刷後、どの程度の時間でその印刷物がタックフリーとなるかの目安であり、これが高いと乾燥性が高いことになる。このような結果となる理由については、必ずしも明らかではない。しかし、溶解性の低いバインダー樹脂は、それを溶解させている油成分が酸化重合や紙面への浸透によりインキ中から失われた際に、析出して固化しやすくなると考えられるところ、本発明で用いるバインダー樹脂の溶解性がとても低いため、わずかな量の油成分がインキ組成物から失われただけでこうした固化が生じたためと推測される。そして、本発明のインキ組成物は、このように高いセット性を示すので、コバルトでない、マンガン等の遷移金属を含むドライヤーを用いても実用に耐えうる乾燥状態を得ることができる。このことは、ドライヤーに含まれるコバルトの使用を抑制し、より一層、環境負荷の小さな印刷の実現に貢献することにつながる。 Further, the present inventor has found that the setting property of the ink composition is improved by using the resin having low solubility as the binder resin as described above. The settability of the ink composition is a measure of how long the printed material becomes tack-free after printing on the paper surface, and when it is high, the drying property is high. The reason for such a result is not always clear. However, in the present invention, a binder resin having low solubility is likely to precipitate and solidify when the oil component dissolving it is lost from the ink due to oxidative polymerization or permeation into the paper surface. It is speculated that this solidification occurred because the binder resin used had a very low solubility and only a small amount of oil component was lost from the ink composition. Since the ink composition of the present invention exhibits such high settability, it is possible to obtain a dry state that can be practically used even if a dryer containing a transition metal such as manganese which is not cobalt is used. This suppresses the use of cobalt contained in the dryer and contributes to the realization of printing with a lower environmental load.
 バインダー樹脂としては、レゾール誘導体でなく、その80gを200℃に加温された120gの大豆油中で30分間撹拌されて溶解することで、n-ヘキサントレランスが2~7g/5gである溶解ワニスを与えるものであればよい。このような樹脂としては、ロジンエステル、ロジン変性マレイン酸樹脂等が例示され、これらの中でも、ロジンエステルが好ましく例示される。 The binder resin was not a resole derivative, but 80 g of it was dissolved in 120 g of soybean oil heated to 200° C. while stirring for 30 minutes to dissolve it, resulting in a varnish having a n-hexane tolerance of 2 to 7 g/5 g. Anything that gives Examples of such resins include rosin esters and rosin-modified maleic acid resins, and of these, rosin esters are preferred.
 ロジンエステルは、ロジンと多価アルコールとを脱水縮合させることで得られる樹脂である。ロジンには、アビエチン酸を初めとして、カルボキシル基を有する化合物が含まれ、こうしたカルボキシル基を有する化合物と、複数の水酸基を有する多価アルコールとが脱水縮合することで、高分子量化し、ロジンエステルとなる。また、原料となるロジンに含まれる化合物の中には、レボピマール酸のように、cis-ジエン構造を備えたものがある。そこで、上記の脱水縮合反応を行うのに先立って、ロジンとマレイン酸との間でディールスアルダー付加反応によりマレイン酸変性を行っておくことで、ロジンがカルボキシル基に富んだ化合物を含むようになり、こうした変性を行ったロジンを用いて多価アルコールとの間で脱水縮合反応を行うと、より高分子量のロジンエステルが得られる。さらに、上記の脱水縮合反応を行う際に脂肪酸を共存させることで、得られるロジンエステルの特性を様々に変化させることも可能である。これらのロジンエステルは、樹脂中に占めるロジン等といった天然成分(バイオマス)の比率が高く、この点でも環境負荷の低い印刷を実現できるインキ組成物につながるので好ましい。 Rosin ester is a resin obtained by dehydration condensation of rosin and polyhydric alcohol. Rosin includes a compound having a carboxyl group, such as abietic acid, and a compound having such a carboxyl group and a polyhydric alcohol having a plurality of hydroxyl groups are dehydrated and condensed to have a high molecular weight and to be a rosin ester. Become. Some compounds contained in rosin as a raw material have a cis-diene structure such as levopimaric acid. Therefore, prior to carrying out the above dehydration condensation reaction, maleic acid modification is carried out by a Diels-Alder addition reaction between rosin and maleic acid, so that the rosin contains a compound rich in a carboxyl group. When a dehydration condensation reaction is carried out with a polyhydric alcohol using such a modified rosin, a higher molecular weight rosin ester is obtained. Furthermore, by allowing a fatty acid to coexist when the above dehydration condensation reaction is performed, it is possible to variously change the characteristics of the obtained rosin ester. These rosin esters are preferable because they have a high ratio of natural components (biomass) such as rosin in the resin, and in this respect also lead to an ink composition that can realize printing with a low environmental load.
 ロジンエステルの調製に用いる多価アルコールとしては、グリセリン、ペンタエリスリトール等が好ましく例示されるが、これ以外の多価アルコールを用いてもよい。 As the polyhydric alcohol used for preparing the rosin ester, glycerin, pentaerythritol and the like are preferably exemplified, but other polyhydric alcohols may be used.
 上記のような化学反応で得られるロジンエステルは、種々のものが市販されているので、そうした市販品を購入してインキ組成物の調製に用いてもよい。このような市販品は、ハリマ化成株式会社、荒川化学工業株式会社、LAWTER社等から入手することができる。 Since various rosin esters obtained by the above chemical reaction are commercially available, such commercially available products may be purchased and used for preparing an ink composition. Such commercial products can be obtained from Harima Kasei Co., Ltd., Arakawa Chemical Industry Co., Ltd., LAWTER, and the like.
 次に、本発明における、樹脂のn-ヘキサントレランスの測定方法について説明する。まず、測定対象となる樹脂80gを用意し、これを200℃に加温された120gの大豆油中で30分間撹拌することで溶解させて、溶解ワニスを調製する。得られた溶解ワニスを室温まで放冷してからビーカーに5g採取し、これをビーカー内の液温を25℃に維持した状態にて、ビーカーの内の溶解ワニスにn-ヘキサンを少量ずつ撹拌しながら加え、ビーカー内の液体が白濁を始めるまでに要したn-ヘキサンの質量(g)を求める。求めたn-ヘキサンの質量(g)がn-ヘキサントレランス(g/5g)となる。既に述べたように、上記の手順で求めたn-ヘキサントレランスが2~7g/5gである樹脂が、本発明におけるバインダー樹脂として用いられる。このn-ヘキサントレランスは、2~5g/5gであることがより好ましく、2~3g/5gであることがさらに好ましい。 Next, the method for measuring the n-hexane tolerance of the resin in the present invention will be described. First, 80 g of a resin to be measured is prepared and dissolved in 120 g of soybean oil heated to 200° C. by stirring for 30 minutes to prepare a dissolved varnish. After allowing the obtained dissolved varnish to cool to room temperature, 5 g was collected in a beaker, and while maintaining the liquid temperature in the beaker at 25° C., n-hexane was gradually added to the dissolved varnish in the beaker little by little. While adding, the mass (g) of n-hexane required until the liquid in the beaker starts to become cloudy is determined. The obtained mass (g) of n-hexane becomes n-hexane tolerance (g/5g). As already mentioned, a resin having an n-hexane tolerance of 2 to 7 g/5 g determined by the above procedure is used as the binder resin in the present invention. The n-hexane tolerance is more preferably 2 to 5 g/5 g, further preferably 2 to 3 g/5 g.
 バインダー樹脂は、後述する植物油類等とともに加熱されることにより溶解又は分散され、ワニスとされた状態で使用される。ワニスを調製する際、樹脂を溶解させて得られた溶解ワニス中に金属キレート化合物や金属石けん等のゲル化剤を投入し、ゲル化ワニスとしてもよい。こうしたゲル化ワニスを調製し、これをインキ組成物の調製に用いることにより、インキ組成物に適度な粘弾性を付与することができるので好ましい。 The binder resin is dissolved or dispersed by being heated together with vegetable oils, etc., which will be described later, and used as a varnish. When the varnish is prepared, a gelling agent such as a metal chelate compound or metal soap may be added to the dissolved varnish obtained by dissolving the resin to obtain a gelled varnish. It is preferable to prepare such a gelled varnish and use it for the preparation of the ink composition, since it is possible to impart appropriate viscoelasticity to the ink composition.
[植物油類]
 植物油類には、植物油そのもの、及び植物油の脂肪酸アルキルエステルが含まれる。本発明のインキ組成物は、植物油類を含み、この植物油類の少なくとも一部として、植物油の脂肪酸アルキルエステルをインキ組成物全体に対して10~30質量%含むことを特徴とする。
[Vegetable oils]
Vegetable oils include vegetable oils themselves and fatty acid alkyl esters of vegetable oils. The ink composition of the present invention is characterized in that it contains vegetable oils, and at least a part of the vegetable oils contains a fatty acid alkyl ester of vegetable oil in an amount of 10 to 30% by mass based on the entire ink composition.
 植物油としては、大豆油、綿実油、アマニ油、サフラワー油、桐油、トール油、脱水ヒマシ油、カノーラ油等の乾性油や半乾性油等が例示される。また、植物油の脂肪酸アルキルエステルとしては、上記植物油に由来する脂肪酸のモノアルキルエステル等が例示される。この脂肪酸モノアルキルエステルを構成する脂肪酸としては、炭素数16~20の不飽和脂肪酸が好ましく例示され、このような不飽和脂肪酸としては、オレイン酸、リノール酸、リノレン酸、エレオステアリン酸等が好ましく例示される。脂肪酸モノアルキルエステル化合物を構成するアルキル基としては、炭素数1~10のアルキル基が好ましく例示され、より具体的には、メチル基、エチル基、プロピル基、イソプロピル基、ブチル基、イソブチル基、tert-ブチル基、2-エチルヘキシル基等が好ましく例示される。植物油類に含まれる不飽和結合部分が、印刷後のインキ組成物中で酸化重合することでインキ組成物が乾燥する。 Examples of vegetable oils include soybean oil, cottonseed oil, linseed oil, safflower oil, tung oil, tall oil, dehydrated castor oil, canola oil and other drying oils and semi-drying oils. Examples of fatty acid alkyl esters of vegetable oils include monoalkyl esters of fatty acids derived from the above vegetable oils. The fatty acid constituting the fatty acid monoalkyl ester is preferably exemplified by unsaturated fatty acids having 16 to 20 carbon atoms, and such unsaturated fatty acids include oleic acid, linoleic acid, linolenic acid and eleostearic acid. It is preferably exemplified. The alkyl group constituting the fatty acid monoalkyl ester compound is preferably exemplified by an alkyl group having 1 to 10 carbon atoms, and more specifically, a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, A tert-butyl group, a 2-ethylhexyl group and the like are preferably exemplified. The unsaturated bond portion contained in the vegetable oil is oxidized and polymerized in the ink composition after printing, whereby the ink composition is dried.
 上記植物油の脂肪酸アルキルエステルとしては、大豆油脂肪酸ブチルエステルや、アマニ油脂肪酸ブチルエステルなどが好ましく挙げられる。上記の通り、植物油の脂肪酸アルキルエステルのインキ組成物中における含有量は、10~30質量%である。この含有量としては、10~20質量%がより好ましく挙げられ、15~20質量%がさらに好ましく挙げられる。 As the fatty acid alkyl ester of the vegetable oil, soybean oil fatty acid butyl ester and linseed oil fatty acid butyl ester are preferably mentioned. As described above, the content of the fatty acid alkyl ester of vegetable oil in the ink composition is 10 to 30% by mass. The content is more preferably 10 to 20% by mass, and further preferably 15 to 20% by mass.
 また、植物油は、インキ組成物の乾燥性の向上の観点からインキ組成物に含有されることが好ましい。この場合の植物油としては、大豆油、アマニ油、桐油等が好ましく挙げられる。植物油のインキ組成物中における含有量としては、15~40質量%程度が好ましく挙げられ、20~40質量%程度がより好ましく挙げられ、20~35質量%程度がさらに好ましく挙げられる。 Also, vegetable oil is preferably contained in the ink composition from the viewpoint of improving the drying property of the ink composition. Preferable examples of the vegetable oil in this case include soybean oil, linseed oil, tung oil and the like. The content of the vegetable oil in the ink composition is preferably about 15 to 40% by mass, more preferably about 20 to 40% by mass, and even more preferably about 20 to 35% by mass.
[アルキッド樹脂]
 本発明のインキ組成物は、アルキッド樹脂を含有することが好ましい。アルキッド樹脂は、脂肪酸と多価アルコールとを脱水縮合させて調製される樹脂であり、必要に応じて、脂肪酸に加えて無水フタル酸、無水マレイン酸等の多塩基酸を加えて調製される。多くの場合、アルキッド樹脂は、植物油と多価アルコールとを触媒の存在下で加熱し、エステル交換反応と脱水縮合とを同時に生じさせて調製される。アルキッド樹脂において、アルキッド樹脂全体の質量に対する、脂肪酸部分の質量の割合(%)は、油長と呼ばれる。本発明において、油長50~90%アルキッド樹脂が好ましく用いられ、油長60~80%のアルキッド樹脂がより好ましく用いられる。また、本発明では、植物油由来の脂肪酸を含むアルキッド樹脂、すなわち植物油変性アルキッド樹脂が好ましく用いられる。このようなアルキッド樹脂は市販されている。
[Alkyd resin]
The ink composition of the present invention preferably contains an alkyd resin. The alkyd resin is a resin prepared by dehydration condensation of a fatty acid and a polyhydric alcohol, and is prepared by adding a polybasic acid such as phthalic anhydride or maleic anhydride in addition to the fatty acid, if necessary. Alkyd resins are often prepared by heating a vegetable oil and a polyhydric alcohol in the presence of a catalyst to simultaneously undergo a transesterification reaction and a dehydration condensation. In the alkyd resin, the ratio (%) of the mass of the fatty acid portion to the mass of the entire alkyd resin is called the oil length. In the present invention, an alkyd resin having an oil length of 50 to 90% is preferably used, and an alkyd resin having an oil length of 60 to 80% is more preferably used. Further, in the present invention, an alkyd resin containing a fatty acid derived from a vegetable oil, that is, a vegetable oil-modified alkyd resin is preferably used. Such alkyd resins are commercially available.
 本発明のインキ組成物におけるアルキッド樹脂の含有量としては、インキ組成物全体に対して、2~10質量%程度が好ましく挙げられる。 The content of the alkyd resin in the ink composition of the present invention is preferably about 2 to 10% by mass with respect to the entire ink composition.
 アルキッド樹脂は、バインダー樹脂や植物油類とともにワニスの調製時に用いられることが好ましい。これにより、溶解性の小さいバインダー樹脂の溶解をより進めることができる。また、アルキッド樹脂は、顔料分散性を向上させるので、その点でも好ましく用いられる。 Alkyd resin is preferably used together with the binder resin and vegetable oils when preparing the varnish. Thereby, the dissolution of the binder resin having low solubility can be further promoted. Further, the alkyd resin improves the dispersibility of the pigment, and is also preferably used in that respect.
[ドライヤー]
 本発明のインキ組成物は、ドライヤーを含有することが好ましい。既に述べたように、ドライヤーは、印刷後にインキ組成物中の成分が酸化重合するのを助け、インキ組成物の乾燥を促進する作用を備える。一般に、ドライヤーは、遷移金属の金属石鹸からなり、遷移金属としてコバルトを含むものが最も乾燥効果が高いとされる。その一方で、コバルトは、有害性や環境負荷を増加させる点において懸念が残ることは既に説明した通りである。
[Hairdryer]
The ink composition of the present invention preferably contains a dryer. As described above, the dryer has a function of helping the components in the ink composition to undergo oxidative polymerization after printing and promoting the drying of the ink composition. Generally, the dryer is made of a transition metal metal soap, and one containing cobalt as a transition metal is said to have the highest drying effect. On the other hand, it has already been explained that cobalt remains a concern in terms of increasing harmfulness and environmental load.
 その点、既に述べたように、本発明のインキ組成物は、上記のバインダー樹脂を用いることによりセット性が向上しており、コバルトを含むドライヤーを用いなくとも十分な乾燥性を実現できる。このため、本発明のインキ組成物は、コバルト金属石鹸を含有しないことが好ましい。 In that respect, as described above, the ink composition of the present invention has improved settability by using the binder resin described above, and can achieve sufficient dryness without using a dryer containing cobalt. Therefore, the ink composition of the present invention preferably does not contain cobalt metal soap.
 本発明のインキ組成物におけるドライヤーとしては、マンガンの金属石鹸を好ましく挙げることができる。インキ組成物中におけるドライヤーの含有量としては、1~5質量%程度が好ましく挙げられ、1~3質量%程度がより好ましく挙げられる。 As a dryer for the ink composition of the present invention, manganese metal soap can be preferably mentioned. The content of the dryer in the ink composition is preferably about 1 to 5% by mass, more preferably about 1 to 3% by mass.
[鉱物油]
 本発明のインキ組成物には、上記植物油類に加えて鉱物油を添加してもよい。鉱物油としては、溶剤とも呼ばれる軽質鉱物油や、潤滑油状である重質鉱物油等が挙げられる。
[mineral oil]
Mineral oil may be added to the ink composition of the present invention in addition to the above vegetable oils. Examples of the mineral oil include light mineral oil also called a solvent, and heavy mineral oil that is a lubricating oil.
 軽質鉱物油としては、沸点160℃以上、好ましくは沸点200℃以上の非芳香族系石油溶剤が例示される。このような非芳香族系石油溶剤としては、JX日鉱日石エネルギー株式会社製の0号ソルベント、同AFソルベント5号、同AFソルベント6号、同AFソルベント7号等が例示される。 Examples of the light mineral oil include non-aromatic petroleum solvents having a boiling point of 160°C or higher, preferably 200°C or higher. Examples of such a non-aromatic petroleum solvent include No. 0 solvent, AF solvent 5, AF solvent 6, AF solvent 7 and the like manufactured by JX Nippon Mining & Energy Corporation.
 重質鉱物油としては、スピンドル油、マシン油、ダイナモ油、シリンダー油等として分類されてきた各種の潤滑油を挙げることができる。これらの中でも、米国におけるOSHA基準やEU基準に適応させるとの観点からは、縮合多環芳香族成分の含有量が抑制されたものであることが好ましい。このような鉱物油としては、JX日鉱日石エネルギー株式会社製のインクオイルH8、同インクオイルH35(いずれも商品名)、三共油化工業株式会社製のSNH8、同SNH46、同SNH220、同SNH540(いずれも商品名)等が例示される。 Examples of heavy mineral oils include various lubricating oils that have been classified as spindle oils, machine oils, dynamo oils, cylinder oils, and the like. Among these, it is preferable that the content of the condensed polycyclic aromatic component is suppressed from the viewpoint of conforming to the OSHA standard and EU standard in the United States. Examples of such mineral oils include ink oil H8 and ink oil H35 manufactured by JX Nikko Nisseki Energy Co., Ltd. (all trade names), SNH8, SNH46, SNH220 and SNH540 manufactured by Sankyo Yuka Kogyo Co., Ltd. (All are trade names) and the like.
 これらの鉱物油は、単独で又は二種以上を組み合わせて用いることができる。インキ組成物における鉱物油の含有量としては、インキ組成物全体に対して0~50質量%程度を例示することができる。 These mineral oils can be used alone or in combination of two or more kinds. The content of mineral oil in the ink composition may be, for example, about 0 to 50% by mass with respect to the entire ink composition.
[その他の成分]
 本発明のインキ組成物には、保存安定性を向上させたり、印刷性能を向上させたりする等の観点から、必要に応じて上記の各成分の他に各種成分を添加することができる。このような各種成分としては、酸化防止剤、リン酸塩等の塩類、ポリエチレン系ワックス・オレフィン系ワックス・フィッシャートロプシュワックス等のワックス類、アルコール類等が例示される。
[Other ingredients]
Various components can be added to the ink composition of the present invention, if necessary, in addition to the above components, from the viewpoints of improving storage stability and printing performance. Examples of such various components include antioxidants, salts such as phosphates, waxes such as polyethylene wax/olefin wax/Fischer-Tropsch wax, alcohols and the like.
 酸化防止剤としては、ブチルヒドロキシトルエン等のフェノール化合物や、酢酸トコフェロール等を好ましく例示することができ、中でもブチルヒドロキシトルエンをより好ましく例示することができる。インキ組成物にこのような酸化防止剤が添加されることにより、インキ組成物に含まれる成分の酸化が抑制され、保存安定性が向上する。インキ組成物中の酸化防止剤の含有量としては、0.1~2質量%程度を例示することができる。 As the antioxidant, a phenol compound such as butylhydroxytoluene and tocopherol acetate can be preferably exemplified, and butylhydroxytoluene can be more preferably exemplified. By adding such an antioxidant to the ink composition, the oxidation of the components contained in the ink composition is suppressed and the storage stability is improved. The content of the antioxidant in the ink composition may be about 0.1 to 2% by mass.
<オフセット印刷用インキ組成物の製造方法>
 次に、上記オフセット印刷用インキ組成物の製造方法の一実施態様について説明する。以下に説明するオフセット印刷用インキ組成物の製造方法も本発明の一つである。
<Method for producing ink composition for offset printing>
Next, one embodiment of the method for producing the ink composition for offset printing will be described. The method for producing an offset printing ink composition described below is also one aspect of the present invention.
 本発明のオフセット印刷用インキ組成物の製造方法は、植物油類を含有する油成分に、レゾール誘導体でなく、その80gを200℃に加温された120gの大豆油中で30分間撹拌されて溶解することで、n-ヘキサントレランスが2~7g/5gである溶解ワニスを与えるバインダー樹脂を溶解させる工程を備え、ワニスを調製するワニス調製工程と、上記ワニスに顔料を添加して混合し、この混合物に含まれる顔料を分散手段により微粒子化させる練肉工程と、を備え、上記植物油類の少なくとも一部として植物油の脂肪酸アルキルエステルを含むことを特徴とする。すなわち、上記インキ組成物についての説明の中で、所定の溶解性を示すバインダー樹脂と、植物油類、特に植物油の脂肪酸アルキルエステルとを加熱及び溶解してワニスを調製することを説明したが、本発明の製造方法は、そのような工程を含むことを特定したものである。なお、以下の説明において、既に説明したインキ組成物と重複する内容についてはその説明を適宜省略する。 The method for producing the ink composition for offset printing of the present invention is to dissolve an oil component containing a vegetable oil, not a resole derivative, in 80 g of soybean oil heated to 200° C. for 80 minutes while stirring 80 g thereof. By doing so, a step of dissolving a binder resin that gives a dissolving varnish having n-hexane tolerance of 2 to 7 g/5 g is provided, and a varnish preparing step of preparing a varnish and a pigment are added to the varnish and mixed, And a kneading step in which the pigment contained in the mixture is made into fine particles by a dispersing means, and a fatty acid alkyl ester of vegetable oil is contained as at least a part of the vegetable oils. That is, in the description of the ink composition, it was described that a binder resin having a predetermined solubility and vegetable oils, particularly fatty acid alkyl esters of vegetable oils are heated and dissolved to prepare a varnish. The manufacturing method of the invention specifies that such a step is included. In the following description, the description overlapping with the already described ink composition will be omitted as appropriate.
 本発明の製造方法では、既に説明した植物油類を含有する油成分に、これも既に説明したバインダー樹脂を溶解させる工程を備えたワニス調製工程を備える。このとき、植物油類として植物油の脂肪酸アルキルエステルを含むことが必要である。 The production method of the present invention includes a varnish preparation step including a step of dissolving the binder resin, which has already been described, in the oil component containing the vegetable oil, which has already been described. At this time, it is necessary to include a fatty acid alkyl ester of vegetable oil as the vegetable oil.
 油成分に含有される植物油成分には、植物油、及び植物油の脂肪酸アルキルエステルが含まれる。植物油、及び植物油の脂肪酸アルキルエステルについては、既に説明した通りである。また、このとき、既に説明したアルキッド樹脂を添加しておくことが好ましい。この場合、ワニス調製工程にて、バインダー樹脂40質量部に対して、植物油を15~40質量部程度、植物油の脂肪酸アルキルエステルを15~30質量部程度、アルキッド樹脂を3~5質量%程度の割合でそれぞれ混合し、100~150℃にて30~90分間撹拌しながらバインダー樹脂を溶解させ、溶解ワニスを調製すればよい。 The vegetable oil component contained in the oil component includes vegetable oil and fatty acid alkyl ester of vegetable oil. The vegetable oil and the fatty acid alkyl ester of the vegetable oil are as described above. In addition, at this time, it is preferable to add the alkyd resin described above. In this case, in the varnish preparation step, with respect to 40 parts by mass of the binder resin, about 15 to 40 parts by mass of vegetable oil, about 15 to 30 parts by mass of fatty acid alkyl ester of vegetable oil, and about 3 to 5% by mass of alkyd resin are used. The dissolved varnish may be prepared by mixing the respective components in proportion and dissolving the binder resin at 100 to 150° C. for 30 to 90 minutes while stirring.
 得られた溶解ワニスは、そのままインキ組成物の調製に用いてもよいし、金属キレート化合物や金属石けん等のゲル化剤を投入し、さらに加温下で反応させてゲル化ワニスとしてもよい。ゲル化ワニスとする場合、ゲル化剤としては、アルミニウムエチルアセトアセテートジイソプロピレート(ALCH)が好ましく用いられ、その添加量は、溶解ワニス100質量部に対して0.3~1質量%程度とするのが好ましい。ゲル化剤を溶解ワニスに加えた後、100~150℃にて30~90分間反応させることでゲル化ワニスが調製される。ワニス調製工程にて調製されたワニスは、練肉工程に付される。 The obtained dissolved varnish may be used as it is for the preparation of an ink composition, or a gelling agent such as a metal chelate compound or a metal soap may be added and further reacted under heating to form a gel varnish. In the case of using a gelled varnish, aluminum ethyl acetoacetate diisopropylate (ALCH) is preferably used as the gelling agent, and the addition amount thereof is about 0.3 to 1% by mass relative to 100 parts by mass of the dissolved varnish. Preferably. The gelling varnish is prepared by adding the gelling agent to the dissolved varnish and then reacting at 100 to 150° C. for 30 to 90 minutes. The varnish prepared in the varnish preparation step is subjected to the kneading process.
 練肉工程では、上記ワニスに顔料を添加して混合し、この混合物に含まれる顔料を分散手段により微粒子化させる。すなわち、既に説明した顔料をワニスに添加し、ビーズミルや三本ロールミル等で練肉することでその顔料を分散させる。その後、必要に応じてドライヤーや各種の成分(酸化防止剤、アルコール類、ワックス類等)等を加え、さらに植物油等の油成分の添加により粘度調整することでインキ組成物が調製される。インキ組成物の粘度としては、ラレー粘度計による25℃での値が10~50Pa・sであることを例示できるが、特に限定されない。 In the kneading process, a pigment is added to the varnish and mixed, and the pigment contained in this mixture is made into fine particles by a dispersing means. That is, the pigment described above is added to the varnish, and the pigment is dispersed by kneading with a bead mill or a three-roll mill. Thereafter, an ink composition is prepared by adding a dryer, various components (antioxidants, alcohols, waxes, etc.) and the like, if necessary, and further adding an oil component such as vegetable oil to adjust the viscosity. The viscosity of the ink composition may be, for example, 10 to 50 Pa·s at 25° C. by a Raleigh viscometer, but is not particularly limited.
<印刷物の製造方法>
 次に、印刷物の製造方法の一実施態様について説明する。以下に説明する印刷物の製造方法も本発明の一つである。
<Printed matter manufacturing method>
Next, one embodiment of a method for manufacturing a printed matter will be described. The method for producing a printed matter described below is also one aspect of the present invention.
 本発明の印刷物の製造方法は、上記本発明のオフセット印刷用インキ組成物を用いて印刷を行う工程を含むことを特徴とする。既に述べたように、本発明のインキ組成物は、天然由来成分の比率が高く、環境負荷の大きなアルキルフェノールを原料とするロジン変性フェノール樹脂や、同じく環境負荷の大きなコバルトドライヤーを含まないことから、従来の製品よりも環境負荷が小さいことを特徴とする。このようなインキ組成物を用いることにより、より環境負荷の小さい印刷を実現することができ、こうして得られた印刷物もまた、環境負荷の小さなものとなる。 The method for producing a printed matter according to the present invention is characterized by including a step of printing using the ink composition for offset printing according to the present invention. As described above, the ink composition of the present invention has a high ratio of naturally derived components, and does not include a rosin-modified phenol resin made from a large environmentally-friendly alkylphenol as a raw material, or a similarly environmentally-friendly cobalt dryer, It is characterized by a lower environmental load than conventional products. By using such an ink composition, printing with a smaller environmental load can be realized, and the printed matter obtained in this way also has a smaller environmental load.
 また、アルキルフェノールを原料とするロジン変性フェノール樹脂や、有害性の懸念のあるコバルトドライヤーを含まないインキ組成物により印刷された印刷物は、特に、安全性を重視する包装分野にて強く求められるものである。したがって、本発明のインキ組成物を用いて製造された印刷物は、包装用として極めて有用である。 Further, a rosin-modified phenolic resin using an alkylphenol as a raw material, and a printed matter printed with an ink composition that does not contain a cobalt drier, which may be harmful, are particularly strongly required in the packaging field where safety is important. is there. Therefore, the printed matter produced using the ink composition of the present invention is extremely useful for packaging.
 以下、実施例を示すことによりさらに具体的に本発明を説明するが、本発明は以下の実施例に何ら限定されるものではない。なお、以下の記載において、「部」は質量部を意味し、「%」は質量%を意味するものとする。 Hereinafter, the present invention will be described more specifically by showing examples, but the present invention is not limited to the following examples. In addition, in the following description, "part" means a mass part and "%" means the mass %.
[ワニス1の調製]
 冷却管、温度計及び撹拌機を装着した4つ口フラスコに、ロジンエステル(ハリマ化成株式会社製、ハリエスター619CI)41.4部、植物油変性アルキッド樹脂(東新油脂株式会社製、TOKYD-81S-NV)4.4部、大豆油脂肪酸のブチルエステル18.2部及び大豆油35.4部を仕込んだ後130℃に昇温し、同温度を50分間維持することにより樹脂を溶解させた後、アルミニウムエチルアセトアセテートジイソプロピレート(川研ファインケミカル株式会社製、ALCH)を0.6部仕込み、その後130℃で60分間加熱保持して、ワニス1を得た。なお、ワニス1の調製に用いたロジンエステルについての上記n-ヘキサントレランスの値は、2.49(g/5g)だった。
[Preparation of varnish 1]
In a four-necked flask equipped with a cooling pipe, a thermometer and a stirrer, 41.4 parts of rosin ester (Harima Kasei Co., Ltd., Harrier Star 619CI), vegetable oil modified alkyd resin (Toshin Yushi Co., Ltd., TOKYD-81S). -NV) 4.4 parts, 18.2 parts of butyl ester of soybean oil fatty acid and 35.4 parts of soybean oil were charged, the temperature was raised to 130°C, and the same temperature was maintained for 50 minutes to dissolve the resin. Then, 0.6 part of aluminum ethyl acetoacetate diisopropylate (ALCH manufactured by Kawaken Fine Chemical Co., Ltd.) was charged, and then heated and kept at 130° C. for 60 minutes to obtain a varnish 1. The n-hexane tolerance value of the rosin ester used in the preparation of Varnish 1 was 2.49 (g/5g).
[ワニス2の調製]
 冷却管、温度計及び撹拌機を装着した4つ口フラスコに、ワニス1の調製で用いたのと同じロジンエステル41.8部、ワニス1の調製で用いたのと同じ植物油変性アルキッド樹脂4.4部、大豆油脂肪酸のブチルエステル21.1部及び大豆油32.0部を仕込んだ後130℃に昇温し、同温度を50分間維持することにより樹脂を溶解させた後、アルミニウムエチルアセトアセテートジイソプロピレート(川研ファインケミカル株式会社製、ALCH)を0.6部仕込み、その後130℃で60分間加熱保持して、ワニス2を得た。
[Preparation of varnish 2]
3. In a four-necked flask equipped with a cooling tube, a thermometer and a stirrer, 41.8 parts of the same rosin ester used in the preparation of Varnish 1, the same vegetable oil modified alkyd resin used in the preparation of Varnish 1. After charging 4 parts, 21.1 parts of soybean oil fatty acid butyl ester and 32.0 parts of soybean oil, the temperature was raised to 130° C., and the same temperature was maintained for 50 minutes to dissolve the resin, and then aluminum ethylacetate was added. 0.6 part of acetate diisopropylate (ALCH, manufactured by Kawaken Fine Chemicals Co., Ltd.) was charged, and then heated and kept at 130° C. for 60 minutes to obtain a varnish 2.
[ワニス3の調製]
 冷却管、温度計及び撹拌機を装着した4つ口フラスコに、ワニス1の調製で用いたのと同じロジンエステル42.3部、ワニス1の調製で用いたのと同じ植物油変性アルキッド樹脂7.7部、大豆油脂肪酸のブチルエステル19.9部及び大豆油29.4部を仕込んだ後130℃に昇温し、同温度を50分間維持することにより樹脂を溶解させた後、アルミニウムエチルアセトアセテートジイソプロピレート(川研ファインケミカル株式会社製、ALCH)を0.7部仕込み、その後130℃で60分間加熱保持して、ワニス3を得た。
[Preparation of varnish 3]
4. In a four-necked flask equipped with a cooling tube, a thermometer and a stirrer, 42.3 parts of the same rosin ester used in the preparation of Varnish 1, the same vegetable oil modified alkyd resin used in the preparation of Varnish 1. After charging 7 parts, 19.9 parts of butyl ester of soybean oil fatty acid and 29.4 parts of soybean oil, the temperature was raised to 130° C. and the same temperature was maintained for 50 minutes to dissolve the resin, and then aluminum ethylacetate was added. 0.7 part of acetate diisopropylate (ALCH, manufactured by Kawaken Fine Chemical Co., Ltd.) was charged, and then heated and held at 130° C. for 60 minutes to obtain a varnish 3.
[ワニス4の調製]
 冷却管、温度計及び撹拌機を装着した4つ口フラスコに、ワニス1の調製で用いたのと同じロジンエステル41.4部及び大豆油58.0部を仕込んだ後130℃に昇温し、同温度を50分間維持することにより樹脂を溶解させた後、アルミニウムエチルアセトアセテートジイソプロピレート(川研ファインケミカル株式会社製、ALCH)を0.6部仕込み、その後130℃で60分間加熱保持して、ワニス4を得た。
[Preparation of varnish 4]
A 4 neck flask equipped with a cooling tube, a thermometer and a stirrer was charged with 41.4 parts of the same rosin ester and 58.0 parts of soybean oil used in the preparation of Varnish 1 and then heated to 130°C. After dissolving the resin by maintaining the same temperature for 50 minutes, 0.6 parts of aluminum ethyl acetoacetate diisopropylate (ALCH, manufactured by Kawaken Fine Chemical Co., Ltd.) was charged, and then heated and kept at 130° C. for 60 minutes. Then, varnish 4 was obtained.
[ワニス5の調製]
 冷却管、温度計及び撹拌機を装着した4つ口フラスコに、ワニス1の調製で用いたのと同じロジンエステル41.4部及び大豆油脂肪酸のブチルエステル58.0部を仕込んだ後130℃に昇温し、同温度を50分間維持することにより樹脂を溶解させた後、アルミニウムエチルアセトアセテートジイソプロピレート(川研ファインケミカル株式会社製、ALCH)を0.6部仕込み、その後130℃で60分間加熱保持して、ワニス5を得た。
[Preparation of varnish 5]
A 4-necked flask equipped with a cooling tube, a thermometer and a stirrer was charged with 41.4 parts of the same rosin ester used in the preparation of Varnish 1 and 58.0 parts of butyl ester of soybean oil fatty acid, and then 130°C. After the temperature is raised to 50° C. and the temperature is maintained for 50 minutes to dissolve the resin, 0.6 part of aluminum ethyl acetoacetate diisopropylate (Kawaken Fine Chemicals Co., ALCH) is charged, and then at 130° C. at 60° C. After heating and holding for a minute, Varnish 5 was obtained.
[ワニス6の調製]
 冷却管、温度計及び撹拌機を装着した4つ口フラスコに、ロジンエステル(LAWTER社、ECO-REZ-9715A)35.8部、植物油変性アルキッド樹脂(東新油脂株式会社製、TOKYD-81S-NV)3.8部、大豆油脂肪酸のブチルエステル15.8部及び大豆油44.1部を仕込んだ後130℃に昇温し、同温度を50分間維持することにより樹脂を溶解させた後、アルミニウムエチルアセトアセテートジイソプロピレート(川研ファインケミカル株式会社製、ALCH)を0.6部仕込み、その後130℃で60分間加熱保持して、ワニス6を得た。なお、ワニス6の調製に用いたロジンエステルについての上記n-ヘキサントレランスの値は、0.0(g/5g)だった。すなわち、このロジンエステルの80gは、200℃の大豆油120gに溶解しなかった。
[Preparation of varnish 6]
In a four-necked flask equipped with a cooling pipe, a thermometer and a stirrer, 35.8 parts of rosin ester (LAWTER, ECO-REZ-9715A), vegetable oil modified alkyd resin (TOKYD-81S-, manufactured by Toshin Yushi Co., Ltd.) NV) 3.8 parts, 15.8 parts of butyl ester of soybean oil fatty acid and 44.1 parts of soybean oil were charged, the temperature was raised to 130° C., and the same temperature was maintained for 50 minutes to dissolve the resin. Then, 0.6 part of aluminum ethyl acetoacetate diisopropylate (ALCH manufactured by Kawaken Fine Chemical Co., Ltd.) was charged, and then heated and kept at 130° C. for 60 minutes to obtain a varnish 6. The n-hexane tolerance value of the rosin ester used in the preparation of Varnish 6 was 0.0 (g/5g). That is, 80 g of this rosin ester did not dissolve in 120 g of soybean oil at 200°C.
[ワニス7の調製]
 冷却管、温度計及び撹拌機を装着した4つ口フラスコに、ロジンエステル(LAWTER社、ECO-REZ-350C)53.0部、植物油変性アルキッド樹脂(東新油脂株式会社製、TOKYD-81S-NV)4.3部、大豆油脂肪酸のブチルエステル16.2部及び大豆油25.9部を仕込んだ後130℃に昇温し、同温度を50分間維持することにより樹脂を溶解させさせた後、アルミニウムエチルアセトアセテートジイソプロピレート(川研ファインケミカル株式会社製、ALCH)を0.6部仕込み、その後130℃で60分間加熱保持して、ワニス7を得た。なお、ワニス7の調製に用いたロジンエステルについての上記n-ヘキサントレランスの値は、11.5(g/5g)だった。
[Preparation of varnish 7]
In a four-necked flask equipped with a cooling pipe, a thermometer and a stirrer, 53.0 parts of rosin ester (LAWTER, ECO-REZ-350C), vegetable oil-modified alkyd resin (Toshin Yushi Co., Ltd., TOKYD-81S-) NV) 4.3 parts, soybean oil fatty acid butyl ester 16.2 parts and soybean oil 25.9 parts were charged and then heated to 130° C., and the same temperature was maintained for 50 minutes to dissolve the resin. Then, 0.6 parts of aluminum ethyl acetoacetate diisopropylate (ALCH manufactured by Kawaken Fine Chemical Co., Ltd.) was charged, and then heated and held at 130° C. for 60 minutes to obtain a varnish 7. The n-hexane tolerance of the rosin ester used in the preparation of Varnish 7 was 11.5 (g/5g).
[ワニス8の調製]
 冷却管、温度計及び撹拌機を装着した4つ口フラスコに、ワニス1の調製で用いたのと同じロジンエステル38.0部、ワニス1の調製で用いたのと同じ植物油変性アルキッド樹脂4.0部、大豆油脂肪酸のブチルエステル10.9部及び大豆油46.5部を仕込んだ後130℃に昇温し、同温度を50分間維持することにより樹脂を溶解させた後、アルミニウムエチルアセトアセテートジイソプロピレート(川研ファインケミカル株式会社製、ALCH)を0.6部仕込み、その後130℃で60分間加熱保持して、ワニス8を得た。
[Preparation of varnish 8]
3. In a four-necked flask equipped with a cooling tube, a thermometer and a stirrer, 38.0 parts of the same rosin ester used in the preparation of Varnish 1, the same vegetable oil modified alkyd resin used in the preparation of Varnish 1. After charging 0 part, 10.9 parts of butyl ester of soybean oil fatty acid and 46.5 parts of soybean oil, the temperature was raised to 130° C. and the temperature was maintained for 50 minutes to dissolve the resin, and then aluminum ethylacetate was added. 0.6 part of acetate diisopropylate (Kawaken Fine Chemical Co., Ltd., ALCH) was charged, and then heated and held at 130° C. for 60 minutes to obtain a varnish 8.
[ワニス9の調製]
 冷却管、温度計及び撹拌機を装着した4つ口フラスコに、ロジン変性フェノール樹脂(荒川化学株式会社製、タマノル414)38.5部、植物油変性アルキッド樹脂(東新油脂株式会社製、TOKYD-81S-NV)4.1部、大豆油脂肪酸のブチルエステル17.0部及び大豆油39.9部を仕込んだ後130℃に昇温し、同温度を50分間維持することにより樹脂を溶解させた後、アルミニウムエチルアセトアセテートジイソプロピレート(川研ファインケミカル株式会社製、ALCH)を0.6部仕込み、その後130℃で60分間加熱保持して、ワニス9を得た。なお、ワニス9の調製に用いたロジン変性フェノール樹脂についての上記n-ヘキサントレランスの値は、3.1(g/5g)だった。
[Preparation of varnish 9]
In a four-necked flask equipped with a cooling tube, a thermometer, and a stirrer, 38.5 parts of rosin-modified phenolic resin (Tamanor 414 manufactured by Arakawa Chemical Co., Ltd.), alkyd resin modified with vegetable oil (TOKYD-made by Toshin Yushi Co., Ltd.) 81S-NV) 4.1 parts, 17.0 parts of butyl ester of soybean oil fatty acid and 39.9 parts of soybean oil were charged and then heated to 130° C., and the same temperature was maintained for 50 minutes to dissolve the resin. After that, 0.6 part of aluminum ethyl acetoacetate diisopropylate (ALCH manufactured by Kawaken Fine Chemical Co., Ltd.) was charged, and then heated and kept at 130° C. for 60 minutes to obtain a varnish 9. The n-hexane tolerance value of the rosin-modified phenol resin used for the preparation of Varnish 9 was 3.1 (g/5g).
[インキ組成物の調製]
 表1に示す処方にて各種の材料を混合し、三本ロールを用いて練肉することで実施例1~5、比較例1~4、及び参考例1~2のインキ組成物をそれぞれ調製した。表1に示した各成分の配合量は質量部である。また、「合計」欄よりも下の欄には、植物油脂肪酸アルキルエステルのインキ組成物中における含有量(%;「エステル(%)」と表記)、及び植物油変性アルキッド樹脂のインキ組成物中における含有量(%;「アルキッド(%)」と表記)を記載した。表1において、「藍顔料」はフタロシアニン顔料PB15:3であり、「黄顔料」はジスアゾエロー顔料PY12であり、「アルキッド樹脂」は植物油変性アルキッド樹脂(東新油脂株式会社製、TOKYD-81S-NV)4.1部、大豆油脂肪酸のブチルエステル17.0部及び大豆油39.9部を仕込んだ)であり、「ワックス」はポリエチレンワックスであり、「Coドライヤー」はコバルト系の金属ドライヤーであり、「Mnドライヤー」はマンガン系の金属ドライヤーであり、「脂肪酸エステル」は大豆油脂肪酸ブチルエステルである。
[Preparation of ink composition]
The ink compositions of Examples 1 to 5, Comparative Examples 1 to 4 and Reference Examples 1 and 2 were prepared by mixing various materials according to the formulations shown in Table 1 and kneading them using a triple roll. did. The blending amount of each component shown in Table 1 is parts by mass. In addition, in the columns below the “total” column, the content of the vegetable oil fatty acid alkyl ester in the ink composition (%; expressed as “ester (%)”) and the vegetable oil-modified alkyd resin in the ink composition The content (%; described as "alkyd (%)") is described. In Table 1, "Ai pigment" is a phthalocyanine pigment PB15:3, "Yellow pigment" is a disazo yellow pigment PY12, and "Alkyd resin" is a vegetable oil-modified alkyd resin (TOKYD-81S-NV manufactured by Toshin Yushi Co., Ltd.). ) 4.1 parts, 17.0 parts of butyl ester of soybean oil fatty acid and 39.9 parts of soybean oil were charged), "wax" is polyethylene wax, and "Co dryer" is a cobalt-based metal dryer. Yes, “Mn dryer” is a manganese-based metal dryer, and “fatty acid ester” is soybean oil fatty acid butyl ester.
[流動性の評価]
 各実施例、比較例及び参考例のインキ組成物における流動性の評価としては、垂直ガラス板流度計を用いて、25℃において、インキ組成物0.5ccが重力により15分間で流れた距離を測定した。この距離が大きいほど、流動性が良好であり、顔料の分散性が優れることになる。評価基準は下記の通りとし、その結果を表2の流動性欄に示す。なお、藍インキについては参考例1を標準とし、黄インキについては参考例2を標準とした(以下同様である)。
 ○:標準とした参考例(参考例1又は2)と同等
 △:標準とした参考例(参考例1又は2)よりも劣るが、実用性の範囲内
 ×:標準とした参考例(参考例1又は2)よりも著しく劣り、実用性の範囲外
[Evaluation of liquidity]
To evaluate the fluidity of the ink compositions of Examples, Comparative Examples and Reference Examples, a vertical glass plate rheometer was used, and at a temperature of 25° C., the distance at which 0.5 cc of the ink composition flowed in 15 minutes due to gravity. Was measured. The larger this distance, the better the fluidity and the better the dispersibility of the pigment. The evaluation criteria are as follows, and the results are shown in the liquidity column of Table 2. For indigo ink, Reference Example 1 was used as a standard, and for yellow ink, Reference Example 2 was used as a standard (the same applies below).
◯: Equivalent to the standard reference example (Reference example 1 or 2) Δ: Inferior to the standard reference example (Reference example 1 or 2), but within the practical range ×: Standard reference example (Reference example Remarkably inferior to 1 or 2) and out of practical range
[紙面乾燥性の評価]
 実施例、比較例及び参考例のインキ組成物のそれぞれについて、インキ組成物0.1ccを、RI展色機(2分割ロール、株式会社明製作所製)を用いて塗工紙(日本製紙株式会社製、オーロラコート)に展色した。その後、室温25℃、湿度50%環境下にて、あて紙を被せた展色物を紙面乾燥試験機(東洋精機株式会社製)にセットし、酸化重合による塗膜乾燥状態の判断のため、あて紙に対するインキ付着の様子を目視で確認した。あて紙にインキが付着しなくなるのに要した時間を紙面乾燥時間とした。評価基準は下記の通りとし、その結果を表2の紙面乾燥性欄に示す。
 ○:標準とした参考例(参考例1又は2)と同等
 △:標準とした参考例(参考例1又は2)よりも劣るが、実用性の範囲内
 ×:標準とした参考例(参考例1又は2)よりも著しく劣り、実用性の範囲外
[Evaluation of paper dryness]
For each of the ink compositions of Examples, Comparative Examples, and Reference Examples, 0.1 cc of the ink composition was coated on a coated paper (Nippon Paper Manufacturing Co., Ltd.) using a RI color spreading machine (two-division roll, manufactured by Akira Seisakusho Co., Ltd.). Made by Aurora Coat). After that, at room temperature of 25° C. and humidity of 50%, the developed material covered with a backing paper is set in a paper surface drying tester (manufactured by Toyo Seiki Co., Ltd.) to determine the dry state of the coating film by oxidative polymerization. The state of ink adhesion to the coated paper was visually confirmed. The time required for the ink to not adhere to the coated paper was defined as the paper surface drying time. The evaluation criteria are as follows, and the results are shown in the paper surface dryness column of Table 2.
◯: Equivalent to the standard reference example (Reference example 1 or 2) Δ: Inferior to the standard reference example (Reference example 1 or 2), but within the practical range ×: Standard reference example (Reference example Remarkably inferior to 1 or 2) and out of practical range
[セット時間の評価]
 各実施例、比較例及び参考例のインキ組成物のそれぞれについて、インキ組成物0.1ccを、RI展色機(4分割ロール、株式会社明製作所製)を用いて塗工紙(日本製紙株式会社製、オーロラコート)に展色した。その後、室温25℃、湿度50%環境下にて、展色直後の各展色物の展色面にあて紙を被せてセット試験機(AUTO INKSETTING TESTER、東洋精機株式会社製)にセットし、セット試験を3分間隔で行って、あて紙に対するインキ付着の様子を目視で確認した。あて紙にインキが付着しなくなるのに要した時間をセット時間とした。評価基準は下記の通りとし、その結果を表2のセット性欄に示す。
 ○:標準とした参考例(参考例1又は2)と同等
 △:標準とした参考例(参考例1又は2)よりも劣るが、実用性の範囲内
 ×:標準とした参考例(参考例1又は2)よりも著しく劣り、実用性の範囲外
[Evaluation of set time]
For each of the ink compositions of Examples, Comparative Examples and Reference Example, 0.1 cc of the ink composition was coated on a coated paper (Nippon Paper Mills Co., Ltd.) using a RI color spreader (4-division roll, manufactured by Meisei Co., Ltd.). The product was made by the company, Aurora Coat). Then, at room temperature of 25° C. and a humidity of 50%, put a paper on the color surface of each color-developed product immediately after the color development, and set it on a set tester (AUTO INKSETTING TESTER, manufactured by Toyo Seiki Co., Ltd.), The set test was conducted at intervals of 3 minutes, and the state of ink adhesion to the coated paper was visually confirmed. The time required until the ink did not adhere to the contact paper was set as the set time. The evaluation criteria are as follows, and the results are shown in the set property column of Table 2.
◯: Equivalent to the standard reference example (Reference example 1 or 2) Δ: Inferior to the standard reference example (Reference example 1 or 2), but within the practical range ×: Standard reference example (Reference example Remarkably inferior to 1 or 2) and out of practical range
[光沢の評価]
 実施例、比較例及び参考例のインキ組成物のそれぞれについて、インキ組成物0.1ccを、RI展色機(2分割ロール、株式会社明製作所製)を用いて塗工紙(日本製紙株式会社製、オーロラコート)に展色した。その後、室温25℃、湿度50%環境下にて保管し、24時間後に光沢計(日本電色工業製)を用いて展色面の60°反射光沢値を求めた。評価基準は下記の通りとし、その結果を表2の光沢欄に示す。
 ○:標準とした参考例(参考例1又は2)と同等
 △:標準とした参考例(参考例1又は2)よりも劣るが、実用性の範囲内
 ×:標準とした参考例(参考例1又は2)よりも著しく劣り、実用性の範囲外
[Evaluation of gloss]
For each of the ink compositions of Examples, Comparative Examples, and Reference Examples, 0.1 cc of the ink composition was coated on a coated paper (Nippon Paper Manufacturing Co., Ltd.) using a RI color spreading machine (two-division roll, manufactured by Akira Seisakusho Co., Ltd.). Made by Aurora Coat). Then, it was stored at room temperature of 25° C. and humidity of 50%, and after 24 hours, the 60° reflection gloss value of the developed surface was obtained using a gloss meter (manufactured by Nippon Denshoku Industries Co., Ltd.). The evaluation criteria are as follows, and the results are shown in the gloss column of Table 2.
◯: Equivalent to the standard reference example (Reference example 1 or 2) Δ: Inferior to the standard reference example (Reference example 1 or 2), but within the practical range ×: Standard reference example (Reference example Remarkably inferior to 1 or 2) and out of practical range
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
 表2によれば、本発明のインキ組成物は、ロジン変性フェノール樹脂(レゾール誘導体)を含まないにもかかわらず、ロジン変性フェノール樹脂を含む従来タイプのインキ組成物(参考例1)と同等の印刷適性を実現していることがわかる。このことから、本発明のインキ組成物は、環境負荷の小さい材料を用いながら、十分な印刷適性の得られるものであることが理解できる。 According to Table 2, although the ink composition of the present invention does not contain the rosin-modified phenolic resin (resole derivative), it is equivalent to the conventional type ink composition containing the rosin-modified phenolic resin (Reference Example 1). It can be seen that printability is achieved. From this, it can be understood that the ink composition of the present invention has sufficient printability while using a material having a low environmental load.

Claims (9)

  1.  顔料、バインダー樹脂、及び植物油類を含むオフセット印刷用インキ組成物であって、
     前記バインダー樹脂が、レゾール誘導体でなく、その80gを200℃に加温された120gの大豆油中で30分間撹拌されて溶解することで、n-ヘキサントレランスが2~7g/5gである溶解ワニスを与えるものであり、
     前記植物油類の少なくとも一部として、植物油の脂肪酸アルキルエステルを組成物全体に対して10~30質量%含むことを特徴とするオフセット印刷用インキ組成物。
    An ink composition for offset printing containing a pigment, a binder resin, and vegetable oils,
    The binder resin is not a resol derivative, and 80 g of the binder resin is dissolved in 120 g of soybean oil heated to 200° C. while stirring for 30 minutes to dissolve the binder resin, so that the n-hexane tolerance is 2 to 7 g/5 g. Is to give
    An ink composition for offset printing, characterized in that, as at least a part of the vegetable oil, a fatty acid alkyl ester of vegetable oil is contained in an amount of 10 to 30% by mass based on the entire composition.
  2.  さらに、油長50~90%のアルキッド樹脂を組成物全体に対して2~10質量%含むことを特徴とする請求項1記載のオフセット印刷用インキ組成物。 The ink composition for offset printing according to claim 1, further comprising 2 to 10 mass% of an alkyd resin having an oil length of 50 to 90% based on the entire composition.
  3.  前記バインダー樹脂が、ロジンエステルであることを特徴とする請求項1又は2記載のオフセット印刷用インキ組成物。 The ink composition for offset printing according to claim 1 or 2, wherein the binder resin is a rosin ester.
  4.  コバルト金属石鹸を含有しないことを特徴とする請求項1~3のいずれか1項記載のオフセット印刷用インキ組成物。 The ink composition for offset printing according to any one of claims 1 to 3, which does not contain cobalt metal soap.
  5.  植物油類を含有する油成分に、レゾール誘導体でなく、その80gを200℃に加温された120gの大豆油中で30分間撹拌されて溶解することで、n-ヘキサントレランスが2~7g/5gである溶解ワニスを与えるバインダー樹脂を溶解させる工程を備え、ワニスを調製するワニス調製工程と、
     前記ワニスに顔料を添加して混合し、この混合物に含まれる顔料を分散手段により微粒子化させる練肉工程と、を備え、
     前記植物油類の少なくとも一部として植物油の脂肪酸アルキルエステルを含むオフセット印刷用印刷インキ組成物の製造方法。
    To the oil component containing vegetable oils, 80 g of the resol derivative, not the resol derivative, was dissolved in 120 g of soybean oil heated to 200° C. with stirring for 30 minutes to obtain n-hexane tolerance of 2 to 7 g/5 g. A varnish preparation step of preparing a varnish, which comprises a step of dissolving a binder resin which gives a dissolution varnish which is
    A method of adding a pigment to the varnish, mixing the mixture, and kneading the pigment contained in the mixture into fine particles by dispersing means,
    A method for producing a printing ink composition for offset printing, comprising a fatty acid alkyl ester of vegetable oil as at least a part of the vegetable oil.
  6.  前記ワニス調製工程にてワニスを調製する際に、油長50~90%のアルキッド樹脂を添加することを特徴とする請求項5記載のオフセット印刷用印刷インキ組成物の製造方法。 The method for producing a printing ink composition for offset printing according to claim 5, wherein an alkyd resin having an oil length of 50 to 90% is added when the varnish is prepared in the varnish preparation step.
  7.  前記バインダー樹脂が、ロジンエステルであることを特徴とする請求項5又は6記載のオフセット印刷用印刷インキ組成物の製造方法。 The method for producing a printing ink composition for offset printing according to claim 5 or 6, wherein the binder resin is a rosin ester.
  8.  請求項1~4のいずれか1項記載のオフセット印刷用インキ組成物を用いて印刷を行う工程を含むことを特徴とする印刷物の製造方法。 A method for producing a printed matter, comprising a step of printing using the ink composition for offset printing according to any one of claims 1 to 4.
  9.  前記印刷物が包装用であることを特徴とする請求項8記載の印刷物の製造方法。 The method for producing a printed matter according to claim 8, wherein the printed matter is for packaging.
PCT/JP2019/040949 2018-11-30 2019-10-17 Ink composition for offset printing, method for producing same, and method for producing printed matter in which same is used WO2020110501A1 (en)

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