JP7252062B2 - BLACK GRAVURE PRINTING INK COMPOSITION FOR LAMINATES - Google Patents

Description

The present invention relates to a black gravure printing ink composition for laminates.

As described in Patent Documents 1 to 3, laminating ink compositions for flexible packaging that can contain any pigment selected from carbon black, inorganic pigments, and organic pigments are known.
However, there is no gravure ink composition in which the composition of the pigment has been studied in consideration of the abrasion of the doctor during black gravure printing containing carbon black. was advancing.

Japanese Patent No. 5848837 JP 2015-108057 A JP 2015-108056 A

The present invention reduces storage stability, adhesiveness, blocking resistance, and properties related to guide roll removal by adjusting a pigment composition containing carbon black and a pigment having a phthalocyanine skeleton as a black gravure printing ink composition. An object of the present invention is to reduce abrasion of a doctor without

The present inventors have found that the above problems can be solved by using the following black gravure printing ink composition for laminate.
That is, the present invention
1. A black gravure printing ink composition for lamination containing a binder resin, carbon black, an organic solvent, and water,
Containing a polyurethane resin as a binder resin,
A black gravure printing ink composition for laminate containing 0.1 to 13.0% by mass of a pigment having a phthalocyanine skeleton relative to carbon black.
2. 2. For laminating according to 1, wherein the polyurethane resin has at least one selected from primary amino groups and secondary amino groups at the terminal of the molecule and has an amine value of 1 to 10 mgKOH/g. A black gravure printing ink composition.
3. The polyurethane resin is a polyurethane resin having a hydroxyl group and at least one selected from a primary amino group and a secondary amino group at the end of the molecule and having an amine value of 1 to 10 mgKOH/g 1 or 2. The black gravure printing ink composition for lamination according to 2 above.
4. Any one of 1 to 3, wherein the polyurethane resin contains a biopolyurethane resin, and the content of the vegetable oil-derived component in the solid content (excluding the pigment) of the black gravure printing ink composition for lamination is 3 to 70% by mass. Black gravure printing ink composition for laminates as described.
5. The biopolyurethane resin is a biopolyurethane resin obtained by reacting a polyol component and an isocyanate component, and the polyol component includes a plant-derived short-chain diol component having 2 to 4 carbon atoms and a plant-derived carboxylic acid component. 5. The black gravure printing ink composition for laminates according to 4, which contains a biopolyester polyol reacted with
6. 6. The black gravure printing ink composition for laminate according to any one of 1 to 5, further comprising a vinyl chloride/vinyl acetate copolymer resin and/or a vinyl chloride/acrylic copolymer resin as a binder resin.
7. 7. The black gravure printing ink composition for laminate according to any one of 1 to 6, containing at least one selected from rosin and its derivatives, dammar resin, chlorinated polypropylene, silica, polyethylene wax, and fatty acid amide.

According to the present invention, when gravure printing is performed with a printing ink containing carbon black and a pigment having a phthalocyanine skeleton, the printed ink composition exhibits excellent adhesion to substrates, blocking resistance, and retort resistance. In addition, abrasion of the doctor can be reduced in addition to preventing the guide roll from being caught during printing.

In the present invention, a black gravure printing ink composition for lamination will be described below.
[Carbon black]
The black gravure printing ink composition for laminate of the present invention contains carbon black.
As the carbon black, neutral or acidic carbon black or the like conventionally used in gravure printing inks can be used.
When carbon black is contained, its content is preferably 1.0 to 30.0% by mass, more preferably 3.0 to 15.0% by mass, in the black gravure printing ink composition for laminate.

Furthermore, the average primary particle size of carbon black is preferably 20 to 70 nm, more preferably 20 to 60 nm. By setting the average particle size within this range, it is possible to achieve both excellent colorability and dispersibility, and to improve doctor sharpness.
Further, those having a specific surface area of 30 to 120 m ² /g are preferable from the point of view of improving doctor sharpness and dispersibility.
Further, the DBP oil absorption is preferably 30 to 130 ml/100 g in terms of excellent dispersibility, and more preferably 40 to 120 ml/100 g.
Specifically, Orion Engineered Carbons Printex 25 (average primary particle diameter 56 nm, DBP oil absorption 45 ml/100 g, specific surface area 45 m ² /g, pH 10.5), Printex 35 (average primary particle Diameter 31 nm, DBP oil absorption 42 ml/100 g, specific surface area 65 m ² /g, pH 9.0), Printex 60 (average primary particle diameter 21 nm, DBP oil absorption 114 ml/100 g, specific surface area 115 m ² /g, pH 10), purine Tex 200 (average primary particle size 56 nm, DBP oil absorption 46 ml/100 g, specific surface area 45 m ² /g, pH 9.0), Mitsubishi Chemical #20 (average primary particle size 50 nm, DBP oil absorption 121 ml/100 g, ratio surface area 45 m ² /g, pH 7.5), #40 (average primary particle diameter 24 nm, DBP oil absorption 110 ml/100 g, specific surface area 115 m ² /g, pH 8.0), #30 (average primary particle diameter 30 nm, DBP oil absorption amount 113 ml/100 g, specific surface area 74 m ² /g, pH 8.0), Special Black 250P (average primary particle diameter 47 nm, DBP oil absorption 49 ml/100 g, specific surface area 48 m ² /g, pH 3.1), Special Black 100 ( Average primary particle diameter 51 nm, DBP oil absorption 100 ml/100 g, specific surface area 30 m ² /g, pH 3.3), Special Black 4P (average primary particle diameter 25 nm, DBP oil absorption 110 ml/100 g, specific surface area 180 m ² /g, pH 3 .0), Nerox 2500 (average primary particle size 56 nm, DBP oil absorption 54 ml/100 g, specific surface area 50 m ² /g, pH 3.0), Nerox 3500 (average primary particle size 31 nm, DBP oil absorption 50 ml/100 g, specific surface area 63 m ² /g, pH 3.0), Nerox 555 (average primary particle diameter 26 nm, DBP oil absorption 65 ml/100 g, specific surface area 94 m ² /g, pH 2.5), Nerox 305 (average primary particle diameter 28 nm, DBP oil absorption 58 ml/100 g, specific surface area 90 m ² /g, pH 2.5), Raven 1060 V (average primary particle size 28 nm, DBP oil absorption 50 ml/100 g, specific surface area 70 m ² /g, pH 2.4), MA285 (average primary particle size 40 nm, DBP oil absorption 46.5 ml/100 g, specific surface area 56-66 m ² /g, pH 2.8), MA11 (average primary particle diameter 29 nm, DBP oil absorption 64 ml/100 g, specific surface area 92 m ^{2 /} g, pH 3.5 ), MA14 (average primary particle size 40 nm, DBP oil absorption 67 ml/100 g, specific surface area 56 m ² /g, pH 3.0), MA100 (average primary particle size 24 nm, DBP oil absorption 100 ml/100 g, specific surface area 110 m ² /g , pH 3.5), MA220 (average primary particle diameter 55 nm, DBP oil absorption 93 ml/100 g, specific surface area 36 m ² /g, pH 3.0).
pH is measured at 25°C using a glass electrode by adding 1 g of carbon black to 20 ml of decarbonated distilled water (pH 7.0) and mixing with a magnetic stirrer to prepare an aqueous suspension. (German Industrial Standard DIN ISO 787/9).
The average primary particle diameter is the value of the arithmetic mean diameter obtained by electron microscopic observation.

Black pigments and black dyes other than carbon black can also be used in combination. On the premise that a sufficiently black printed layer can be formed, a known extender, a pigment or dye exhibiting a color other than black, or an extender can be blended into the black gravure printing ink composition.
However, in any of the above cases, it is necessary to carry out within a range that does not impair the effects of the present invention.
As pigments other than carbon black that may be used in the black gravure printing ink composition of the present invention, the following pigments and dyes can be used without limitation.
As inorganic pigments, colored pigments such as titanium oxide, red iron oxide, antimony red, cadmium yellow, cobalt blue, Prussian blue, ultramarine blue, iron black, chromium oxide green, graphite (including achromatic colored pigments such as white and black), and , calcium carbonate, kaolin, clay, barium sulfate, aluminum hydroxide and talc. In addition, as organic pigments, dye lake pigments, azo-based, benzimidazolone-based, phthalocyanine-based, quinacridone-based, anthraquinone-based, dioxazine-based, indigo-based, thioindigo-based, perylene-based, perinone-based, diketopyrrolopyrrole-based, isoindo Examples include linone, nitro, nitroso, anthraquinone, flavanthrone, quinophthalone, pyranthrone, and indanthrone pigments.

[Pigment having a phthalocyanine skeleton]
As the pigment having a phthalocyanine skeleton that can be used in the present invention, any pigment that can be blended in the black gravure printing ink composition for lamination may be used.
As pigments having such a phthalocyanine skeleton, metal phthalocyanine pigments such as copper phthalocyanine, zinc phthalocyanine, and aluminum phthalocyanine, and brominated and chlorinated products of these pigments can be used.
Pigments having such a phthalocyanine skeleton include P.I. B. 15, P. B. 15:1, P.S. B. 15:2, p. B. 15:3, p. B. 15:4, p. B. 15:5, p. B. 15:6, p. B. 16, P. B. 17:1, P.S. G. 7, P. B. 75, and other pigments in which the metal forming the complex is iron, zinc, sodium, tin, magnesium, or lithium.
When the pigment having a phthalocyanine skeleton of the present invention is used in combination with carbon black dispersion, the effect of reducing doctor abrasion is greatly enhanced.
In the present invention, 0.1 to 13.0% by mass, preferably 0.1 to 10.0% by mass, more preferably 0.2 to 8.0% by mass of a pigment having a phthalocyanine skeleton relative to carbon black. Mix as much as possible. If it is less than 0.1% by mass, the effect of reducing doctor abrasion is small, and if it exceeds 13.0% by mass, color change occurs and laminate strength tends to decrease.

[Binder resin]
The binder resin includes polyurethane resin, or polyurethane resin and vinyl chloride/vinyl acetate copolymer resin and/or vinyl chloride/acrylic copolymer resin.
(polyurethane resin)
The polyurethane resin is a polyurethane resin having one or more selected from primary amino groups and secondary amino groups at the terminal of the molecule.
More preferably, it is a polyurethane resin having a hydroxyl group and at least one selected from primary amino groups and secondary amino groups at the terminal of the molecule. As these polyurethane resins, polyurethane resins obtained by synthesizing a urethane prepolymer by reacting an organic diisocyanate compound and a high-molecular-weight diol compound, and optionally reacting it with a chain extender and a reaction terminator, are preferably used. Available.
Examples of the organic diisocyanate compounds include aromatic diisocyanate compounds such as tolylene diisocyanate, alicyclic diisocyanate compounds such as dicyclohexylmethane 4,4'-diisocyanate, 1,4-cyclohexane diisocyanate and isophorone diisocyanate, and hexamethylene diisocyanate. Examples include aliphatic diisocyanate compounds and araliphatic diisocyanate compounds such as α,α,α',α'-tetramethylxylylene diisocyanate. These organic diisocyanate compounds can be used alone or in combination of two or more. Among them, alicyclic diisocyanate compounds, aliphatic diisocyanate compounds and araliphatic diisocyanate compounds are more preferable.

Examples of the polymer diol compound include polyalkylene glycols such as polyethylene glycol and polypropylene glycol, polyether diol compounds such as alkylene oxide adducts such as ethylene oxide and propylene oxide of bisphenol A, adipic acid, sebacic acid, anhydrous One or two or more dibasic acids such as phthalic acid and one glycol such as ethylene glycol, propylene glycol, 1,4-butanediol, neopentyl glycol, 3-methyl-1,5-pentanediol Alternatively, polyester diol compounds such as polyester diols and polycaprolactone diols obtained by condensation reaction of two or more of them may be mentioned. These polymer diol compounds can be used singly or in combination of two or more.
Furthermore, in addition to the above polymer diol compounds, alkanediols such as 1,4-pentanediol, 2,5-hexanediol and 3-methyl-1,5-pentanediol, ethylene glycol, propylene glycol, 1,4- Low-molecular-weight diol compounds such as butanediol and 1,3-butanediol can be used singly or in combination of two or more.
When a mixed solvent system of an ester solvent and an alcohol solvent is used as the organic solvent to be described later in the reaction for synthesizing the polyurethane resin, a polyether diol compound is used as the polymer diol compound. However, the solubility of the resulting polyurethane resin tends to be high, and it is preferable in that it is possible to design a wide range of inks according to the required performance.
As for the use ratio of the organic diisocyanate compound and the polymeric diol compound, the equivalent ratio of isocyanate group to hydroxyl group (isocyanate index) is usually 1.2:1 to 3.0:1, more preferably 1.3: It is in the range of 1 to 2.0:1. If the isocyanate index is less than 1.2, the polyurethane resin tends to be flexible, and the blocking resistance and the like may be low when the ink composition of the present invention is printed. may need to be used in combination with

As the chain extender, known chain extenders that are used in polyurethane resins as binders for inks can be used. Alicyclic diamines such as isophoronediamine and 4,4′-dicyclohexylmethanediamine, aromatic diamines such as toluylenediamine, araliphatic diamines such as xylenediamine, N-(2-hydroxyethyl)ethylenediamine, N -(2-hydroxyethyl)propylenediamine, diamines having a hydroxyl group such as N,N'-di(2-hydroxyethyl)ethylenediamine, ethylene glycol, propylene glycol, 1,4-butanediol, neopentyl glycol, diethylene glycol, Examples include diol compounds such as triethylene glycol.
Furthermore, polyamines such as diethylenetriamine and triethylenetetramine can be used together as long as the polyurethane resin does not gel.

Examples of the reaction terminator for introducing primary amino groups and secondary amino groups at the terminal of the polyurethane resin include aliphatic diamines such as ethylenediamine, propylenediamine, tetramethylenediamine and hexamethylenediamine, isophoronediamine, 4,4 Alicyclic diamines such as '-dicyclohexylmethanediamine, polyamines such as diethylenetriamine and triethylenetetratriamine, aromatic diamines such as toluylenediamine, araliphatic diamines such as xylenediamine, N-(2-hydroxy Examples include diamines having a hydroxyl group such as ethyl)ethylenediamine and N-(2-hydroxyethyl)propylenediamine. Among these, polyamines having primary amino groups such as diethylenetriamine and triethylenetetratriamine are preferred. Examples of the reaction terminator for introducing hydroxyl groups into the polyurethane resin include alkanolamines such as monoethanolamine and diethanolamine, and diamines having hydroxyl groups such as N-(2-hydroxyethyl)ethylenediamine and N-(2-hydroxyethyl)propylenediamine. can be exemplified. In addition, monoamine compounds and monoalcohol compounds, which are known reaction terminating agents, can be used. Specifically, monoalkylamines such as n-propylamine and n-butylamine, and dialkylamines such as di-n-butylamine and monoalcohols such as ethanol can be exemplified.

Since the preferred polyurethane resin has a specific functional group, the black gravure printing ink composition for laminate of the present invention has excellent printability and adhesion to films. In addition, if lamination is performed, it will have excellent lamination aptitude.

Further, when the polyurethane resin has an amino group, it preferably has an amine value of 1 to 10 mgKOH/g. If the amine value is less than 1 mgKOH/g, the adhesion of the black gravure printing ink composition for lamination of the present invention to films may decrease, and further, the suitability for lamination may decrease. If it exceeds g, the blocking resistance may deteriorate.
In the present invention, the amine value means the amine value per 1 g of solid content, and is measured by potentiometric titration (for example, COMTITE (AUTO TITRATOR COM-900, BURET B-900, TITSTATIONK -900), manufactured by Hiranuma Sangyo Co., Ltd.) and converted to the equivalent of potassium hydroxide.

In addition, the polyurethane resin may contain a biopolyurethane (biomass polyurethane) resin in consideration of the environment.
A bio-polyurethane resin will be described. In the description of the biopolyurethane resin, the description common to the polyurethane resin described above will be omitted as appropriate.
A biopolyurethane resin is a polyurethane resin containing biomass-derived (plant-derived) components. Compared to using other exhaustible resources, biopolyurethane resin can contribute to the prevention of global warming and the reduction of environmental impact. Therefore, urethane prepolymer is synthesized through the reaction of biopolyol (biomass polyol) and isocyanate components. It is preferably a biopolyurethane resin obtained by reacting it with a chain extender and a reaction terminator if necessary, and more preferably a bioisocyanate derived from a plant (biomass isocyanate) as an isocyanate component.

The biopolyol component is preferably a biopolyester polyol (biomass polyester polyol) obtained by reacting a short-chain diol component having 2 to 4 carbon atoms with a carboxylic acid component. At least one of the short-chain diol component and the carboxylic acid component of the biopolyol component is more preferably plant-derived, and both are more preferably plant-derived.
The plant-derived short-chain diol component having 2 to 4 carbon atoms is not particularly limited. By way of example, the short chain diol component may be 1,3-propanediol, 1,4-butanediol, ethylene glycol, etc., obtained from plant sources by the following method. These may be used in combination.
1,3-Propanediol can be produced from glycerol via 3-hydroxypropylaldehyde (HPA) by a fermentation process in which plant sources (such as corn) are broken down to yield glucose. Compared to 1,3-propanediol compounds produced by EO production, 1,3-propanediol compounds produced by bio-methods such as the above fermentation method do not produce useful by-products such as lactic acid from the standpoint of safety. It is possible to obtain and keep the manufacturing cost low. 1,4-Butanediol can be produced by hydrogenating succinic acid obtained by producing and fermenting glycol from plant resources. Ethylene glycol can also be produced from bioethanol obtained by conventional methods via ethylene.

The plant-derived carboxylic acid component is not particularly limited. Examples of carboxylic acid components are sebacic acid, succinic acid, lactic acid, glutaric acid, dimer acid, and the like. These may be used in combination. Among these, the carboxylic acid component preferably contains at least one selected from the group consisting of sebacic acid, succinic acid and dimer acid. Also, 0.05 to 0.5 parts by mass of malic acid may be contained with respect to 100 parts by mass of sebacic acid.
The biopolyol component can be produced as a 100% plant-derived biopolyester polyol by appropriately condensing a plant-derived short-chain diol component and a plant-derived carboxylic acid component. Specifically, polytrimethylene sebacate polyol is obtained by direct dehydration condensation of plant-derived sebacic acid and plant-derived 1,3-propanediol. Further, direct dehydration condensation of plant-derived succinic acid and plant-derived 1,4-butanediol gives polybutylene succinate polyol, which may be used in combination.
From an environmental point of view, the biopolyurethane resin is preferably contained in an amount of 10% by mass or more, more preferably 40% by mass or more, in terms of solid content in the polyurethane resin.
As a method for producing the polyurethane resin, a known method for producing a polyurethane resin can be used as it is using the above materials. Further, if the molecular weight, chemical structure, or equivalent ratio of each component differs, the hardness of the resulting polyurethane resin will also differ. Therefore, by appropriately combining these components, it is possible to adjust printability and lamination suitability. .
The weight average molecular weight of the polyurethane resin is preferably 10,000 to 70,000, more preferably 20,000 to 60,000.
Furthermore, in order to increase appropriate flexibility and laminate strength, a polyurethane resin having no urea bond can be blended as the polyurethane resin.

(vinyl chloride/vinyl acetate copolymer)
As the vinyl chloride/vinyl acetate copolymer, vinyl chloride monomer and vinyl acetate monomer conventionally used in gravure printing ink compositions are essential components, and if necessary, vinyl propionate, vinyl monochloroacetate, Versatic Fatty acid vinyl monomers such as vinyl acid vinyl, vinyl laurate, vinyl stearate, and vinyl benzoate, and monomers having functional groups such as hydroxyl groups, which are produced by conventionally known methods, can be used.
Among them, the vinyl chloride/vinyl acetate copolymer is preferably a vinyl chloride/vinyl acetate copolymer having a hydroxyl group, preferably 50 to 200 hydroxyl groups, in an environmentally friendly organic solvent system for ink. be. Such a vinyl chloride/vinyl acetate copolymer having a hydroxyl group can be obtained by saponifying a part of the acetate moiety and introducing a (meth)acrylic monomer having a hydroxyl group.
In the case of a vinyl chloride/vinyl acetate copolymer having a hydroxyl group obtained by saponifying a part of the acetate moiety, a structural unit based on the reaction site of vinyl chloride in the molecule (formula 1 below), acetic acid The physical properties and dissolution behavior of the resin are determined by the ratio of the structural unit based on the reactive site of vinyl (formula 2 below) and the structural unit based on saponification of the reactive site of vinyl acetate (formula 3 below). That is, the structural units based on the reactive sites of vinyl chloride impart toughness and hardness to the resin film, the structural units based on the reactive sites of vinyl acetate provide adhesiveness and flexibility, and the reactive sites of vinyl acetate are saponified. gives the ink good solubility in organic solvent systems, which is environmentally friendly.
Formula 1 —CH ₂ —CHCl—
Formula 2 —CH ₂ —CH(OCOCH ₃ )—
Formula 3 —CH ₂ —CH(OH)—
Such vinyl chloride/vinyl acetate copolymers may be commercially available, for example, Solbin A, AL, TA5R, TA2, TA3, TAO, TAOL, C, CH, CN, CNL etc. can be mentioned.
The vinyl chloride/vinyl acetate copolymer used in the black gravure printing ink composition for laminate of the present invention has various functional groups in the molecule from the viewpoint of solubility in organic solvents and printability described later. preferably.
Further, when an environmentally friendly solvent is used as the organic solvent, the vinyl chloride/vinyl acetate copolymer preferably has 50 to 200 hydroxyl groups. Commercially available vinyl chloride/vinyl acetate copolymers such as Solbin A, AL, TA5R, TA2, TA3, TAO and TAOL are preferably used.

(vinyl chloride/acrylic copolymer)
A vinyl chloride/acrylic copolymer is mainly composed of a copolymer of vinyl chloride and an acrylic monomer. The form of the copolymer is not particularly limited. For example, the acrylic monomer may be incorporated into the main chain of polyvinyl chloride in a block or random manner, or may be graft-copolymerized with the side chain of polyvinyl chloride. .
As the acrylic monomer, a (meth)acrylic acid ester, an acrylic monomer having a hydroxyl group, or the like can be used. Examples of (meth)acrylic acid esters include (meth)acrylic acid alkyl esters, and the alkyl group may be linear, branched, or cyclic, but linear alkyl groups are preferred. For example, methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, cyclohexyl (meth)acrylate , 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, decyl (meth)acrylate, dodecyl (meth)acrylate, tetradecyl (meth)acrylate, hexadecyl (meth)acrylate, (meth)acrylic acid octadecyl and the like.
Examples of acrylic monomers having a hydroxyl group include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, Hydroxyalkyl (meth)acrylates such as 3-hydroxybutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, and 8-hydroxyoctyl (meth)acrylate; , polyethylene glycol mono(meth)acrylate, polypropylene glycol mono(meth)acrylate, glycol mono(meth)acrylate such as 1,4-cyclohexanedimethanol mono(meth)acrylate, caprolactone-modified (meth)acrylate, hydroxyethylacrylamide, etc. mentioned.
Moreover, an acrylic monomer having a functional group other than a hydroxyl group can also be used as the acrylic monomer. Examples of functional groups other than hydroxyl groups include carboxyl groups, amide bond groups, amino groups, and alkylene oxide groups.
The vinyl chloride/acrylic copolymer resin preferably has a weight average molecular weight of 10,000 to 70,000.
Further, from the viewpoint of solubility in an environmentally friendly solvent as the organic solvent and adhesiveness to a substrate, the vinyl chloride/acrylic copolymer preferably has 50 to 200 hydroxyl groups.

In the black gravure printing ink composition for laminate of the present invention, a vinyl chloride/vinyl acetate copolymer and/or a vinyl chloride/acrylic copolymer are used in combination with a polyurethane resin in order to improve adhesion depending on the pigment. be able to.
Polyurethane resin and (vinyl chloride/vinyl acetate copolymer and/or vinyl chloride/acrylic copolymer) are combined with polyurethane resin/(vinyl chloride/vinyl acetate copolymer and/or vinyl chloride/acrylic copolymer )=100/0 to 45/55 (mass ratio). More preferably, this mass ratio may be 95/5 to 70/30. By containing the polyurethane resin and the vinyl chloride/vinyl acetate copolymer and/or the vinyl chloride/acrylic copolymer in such a ratio, the black gravure printing ink composition for laminate of the present invention can It will have excellent printability and adhesion. Furthermore, when lamination is performed, it will have better lamination aptitude.
When the polyurethane resin/(vinyl chloride/vinyl acetate copolymer and/or vinyl chloride/acrylic copolymer) is less than 45/55, (vinyl chloride/vinyl acetate copolymer and/or vinyl chloride/acrylic (copolymer) increases, the printed matter formed using the ink composition of the present invention becomes hard, and the adhesiveness to the film may become insufficient.

[Organic solvent]
The solvent that may be used in the composition of the present invention is not particularly limited, but from the viewpoint of consideration for the environment, it is preferable that the composition does not contain an aromatic hydrocarbon organic solvent. Examples of such solvents include alcohol-based organic solvents such as methanol, ethanol, n-propanol, isopropanol and butanol; ketone-based organic solvents such as acetone, methyl ethyl ketone and methyl isobutyl ketone; methyl acetate, ethyl acetate, propyl acetate and butyl acetate. n-hexane, n-heptane, n-octane and other aliphatic hydrocarbon organic solvents; cyclohexane, methylcyclohexane, ethylcyclohexane, cycloheptane, cyclooctane and other alicyclic hydrocarbon organic solvents Examples include solvents. At least one of the solvents may be used, and two or more of them may be used in combination in consideration of the solubility and drying properties of the binder resin. However, from the viewpoint of consideration for the environment, it is preferable to suppress the use of ketone-based organic solvents among the above solvents.
Furthermore, the black gravure printing ink composition for laminate of the present invention preferably contains 0.1 to 20% by mass of a glycol ether organic solvent based on 100% by mass of the organic solvent in order to improve the wet spreadability. Specific examples of glycol ether-based organic solvents include ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, ethylene glycol mono-n-propyl ether, ethylene glycol monoisopropyl ether, diethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, and ethylene glycol. Examples include monoisobutyl ether, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, propylene glycol mono-n-propyl ether, diethylene glycol dimethyl ether, diethylene glycol methyl ethyl ether, diethylene glycol diethyl ether and the like.

[water]
The black gravure printing ink composition for lamination of the present invention preferably contains water from the viewpoints of mitigation of printing defects due to static electricity, prevention of plate fogging, and cell reproducibility. The amount of water used is preferably 10% by mass or less, preferably in the range of 0.1 to 5.0% by mass in the black gravure printing ink composition for laminate.

[Pigment dispersant that can be used in combination]
As a pigment dispersant that can be used in combination, a polyester-based pigment dispersant that can be generally used in a gravure printing ink composition containing an organic solvent can be used. Specifically, Ajisper PB821, PB822, PB824, PB881 (manufactured by Ajinomoto Fine-Techno Co., Ltd.), Solsperse 24000, 56000 (manufactured by Nippon Lubrizol Co., Ltd.) and the like can be mentioned. can be preferably used.
The content of the pigment dispersant is generally preferably 1 to 200 parts by mass, more preferably 1 to 60 parts by mass, based on 100 parts by mass of all pigments.

[Ingredients that can be used together]
The black gravure printing ink composition for laminate of the present invention preferably contains at least one selected from rosin and derivatives thereof, dammar resin, chlorinated polypropylene, silica, polyethylene wax, and fatty acid amide.
Rosin and its derivatives, chlorinated polypropylene, and dammar resin improve adhesion to various films and lamination suitability. It is preferable to contain one or more of these.
Silica, polyethylene wax, and fatty acid amide improve trapping properties and blocking resistance. It is preferable to contain one or more, preferably two or more of these.

<Rosin and its derivatives>
Rosins include gum rosin, tall oil rosin, wood rosin and the like. Generally, rosin is an amber colored, amorphous resin obtained from pine trees, which is a mixture of abietic acid, neoabietic acid, parastric acid, pimaric acid, isopimaric acid, sandaracopimaric acid, Each component of dehydroabietic acid may be isolated and used, and these are also defined as rosin in the present invention.
Rosin derivatives are compounds obtained by modifying the above rosin, and are specifically listed below.
(1) Hydrogenated rosin: Rosin with improved weather resistance by adding hydrogen to conjugated double bonds (hydrogenation).
(2) Disproportionated rosin: Disproportionation is the reaction of two molecules of rosin to form two molecules of abietic acid with conjugated double bonds, one of which constitutes an aromatic and the other a single double It is the modification that becomes the binding molecule. Weather resistance is generally inferior to hydrogenated rosin, but better than untreated rosin.
(3) Rosin-modified phenolic resin: A rosin-modified phenolic resin is often used as the main binder for offset printing inks. A rosin-modified phenolic resin can be obtained by a known production method.
(4) Rosin ester: An ester resin derived from rosin, which has long been used as a tackifier for adhesives.
(5) Rosin-modified maleic acid resin: A resin obtained by subjecting rosin to an addition reaction with maleic anhydride, and optionally grafting a hydroxyl group-containing compound such as glycerin with an acid anhydride group through esterification.
(6) Polymerized rosin: a derivative containing dimerized resin acids derived from the natural resin rosin.
In addition, known rosin and rosin derivatives can also be used, and these can be used alone or in combination.
Furthermore, the acid value of rosin and rosin derivatives is preferably 120 mgKOH/g or more. When the acid value is 120 mgKOH/g or more, the lamination strength is improved. More preferably, the acid value is 160 mgKOH/g or more. The total amount of rosin and rosin derivative used is 3.0% by mass or less, preferably 0.1% to 3.0% by mass, in terms of solid content mass% of the black gravure printing ink composition for laminate.

<Chlorinated polypropylene>
As chlorinated polypropylene, those having a degree of chlorination of 20 to 50 can be used. Chlorinated polypropylene having a degree of chlorination of less than 20 tends to have reduced compatibility with organic solvents. On the other hand, when the degree of chlorination exceeds 50, the chlorinated polypropylene tends to have reduced adhesion to films. In the present invention, the degree of chlorination is defined by mass % of chlorine atoms in the chlorinated polypropylene resin. Also, the chlorinated polypropylene is preferably modified or unmodified chlorinated polypropylene having a weight average molecular weight of 5,000 to 200,000. If the weight average molecular weight is less than 5,000, the chlorinated polypropylene tends to have poor adhesiveness. On the other hand, when the weight average molecular weight exceeds 200,000, the chlorinated polypropylene tends to be less soluble in organic solvents. The amount of chlorinated polypropylene used is 3.0% by mass or less, preferably 0.1% to 3.0% by mass, in solid content mass% of the black gravure printing ink composition for lamination.

<Dammar resin>
Dammar resin is also described as dammar or dammer, and is a type of natural resin derived from plants. Specifically, it is a kind of natural resin obtained from Dipterocarpaceae or Bursiaceae plants that grow in Southeast Asia such as Malaysia and Indonesia. When used, it is dissolved in a suitable organic solvent to form a varnish. Since the dammar resin does not contain chlorine, chlorine can be eliminated or reduced compared to the case of using a chlorinated polyolefin resin in the printing ink composition. The amount of dammar resin used is 3.0% by mass or less, preferably 0.1% to 3.0% by mass, in terms of solid content mass% of the black gravure printing ink composition for laminate.

<Silica>
Examples of silica include naturally occurring, synthetic, crystalline, non-crystalline, hydrophobic, and hydrophilic silicas. Silica particles preferably have an average particle size in the range of 1 to 5 μm (the average particle size of silica particles means the particle size at an integrated value of 50% (D50) in the particle size distribution, and can be obtained by the Coulter counter method. can be done). The silica particles may be hydrophilic silica having a hydrophilic functional group on the surface, or may be hydrophobic silica obtained by modifying the hydrophilic functional group with an alkylsilane or the like to make it hydrophobic. The ink containing silica particles promotes wetting and spreading of the ink during overprinting, and also has the effect of improving the overprinting effect (hereinafter sometimes referred to as "trapping property"). The amount of silica particles used is 3.0% by mass or less, preferably 0.1 to 3.0% by mass, more preferably 0.2 to 1.5% by mass in the black gravure printing ink composition for lamination. . If the content is more than 3.0% by mass, gloss tends to decrease.

<Polyethylene wax>
The polyethylene wax used has an average particle size in the range of 1.0 to 3.0 μm (the average particle size is #1: the particle size measured by Honeywell Microtrac UPA). If the particle size of the polyethylene wax is smaller than 1.0 μm, the slipping property and the blocking property are lowered, and if the particle size is larger than 3.0 μm, the trapping property is lowered. The content of the polyethylene wax in the black gravure printing ink composition for laminate is preferably 1.5% by mass or less, preferably in the range of 0.1 to 1.5% by mass. If the content is more than 1.5% by mass, gloss tends to decrease.

<Fatty acid amide>
The fatty acid amide is not particularly limited as long as it has a fatty acid residue and an amide group. Examples of fatty acid amides include monoamides, substituted amides, bisamides, methylolamides, esteramides, and the like, and are at least one selected from the group consisting of monoamides, substituted amides, and bisamides to improve blocking resistance. is preferred. The amount of fatty acid amide used is 1% by mass or less, preferably in the range of 0.01 to 1% by mass, in the black gravure printing ink composition for laminate.

- Monoamide: Monoamide is represented by the following general formula (1).
General formula (1) R1-CONH ₂
(Wherein, R1 represents a residue obtained by removing COOH from a fatty acid.)
Specific examples of monoamides include lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, hydroxystearic acid amide, oleic acid amide, and erucic acid amide.
• Substituted amide: A substituted amide is represented by the following general formula (2).
General formula (2) R2-CONH-R3
(Wherein, R2 and R3 represent residues obtained by removing COOH from a fatty acid, and may be the same or different.)
Specific examples of substituted amides include N-oleyl palmitic acid amide, N-stearyl stearic acid amide, N-stearyl oleic acid amide, N-oleyl stearic acid amide, N-stearyl erucic acid amide and the like.

- Bisamide: Bisamide is represented by the following general formula (3) or general formula (4).
General formula (3) R4-CONH-R5-HNCO-R6
General formula (4) R7-NHCO-R8-CONH-R9
(Wherein, R4, R6, R7, and R9 represent residues obtained by removing COOH from a fatty acid and may be the same or different, and R5 and R8 represent an alkylene group or an arylene group having 1 to 10 carbon atoms. )
Specific examples of bisamides include methylenebisstearic acid amide, ethylenebiscapric acid amide, ethylenebislauric acid amide, ethylenebisstearic acid amide, ethylenebishydroxystearic acid amide, ethylenebisbehenic acid amide, and hexamethylenebisstearic acid amide. , hexamethylenebisbehenamide, hexamethylenehydroxystearateamide, ethylenebisoleamide, ethylenebiserucamide, hexamethylenebisoleamide, N,N'-distearyladipamide, N,N'- distearylsebacic acid amide, N,N'-dioleyladipic acid amide, N,N'-dioleylsebacic acid amide and the like.

- Methylolamide: Methylolamide is represented by the following general formula (5).
General formula (5) R10-CONHCH ₂ OH
(Wherein, R10 represents a residue obtained by removing COOH from a fatty acid.)
Specific examples of methylolamide include methylol palmitic acid amide, methylol stearic acid amide, methylol behenic acid amide, methylol hydroxystearic acid amide, methylol oleic acid amide, methylol erucic acid amide and the like.

- Esteramide: Esteramide is represented by the following general formula (6).
General formula (6) R11-CONH-R12-OCO-R13
(Wherein, R11 and R13 represent a residue obtained by removing COOH from a fatty acid and may be the same or different, and R12 represents an alkylene group having 1 to 10 carbon atoms or an arylene group.)
Specific examples of esteramides include stearamidoethyl stearate and oleylamidoethyl ureate.
The melting point of the fatty acid amide is preferably 50°C to 150°C.
Further, the fatty acid constituting the fatty acid amide is preferably a saturated fatty acid having 12 to 22 carbon atoms and/or an unsaturated fatty acid having 16 to 25 carbon atoms, and a saturated fatty acid having 16 to 18 carbon atoms and/or a saturated fatty acid having 18 to 22 carbon atoms. unsaturated fatty acids are more preferred. Particularly preferred saturated fatty acids are lauric acid, palmitic acid, stearic acid, behenic acid and hydroxystearic acid, and particularly preferred unsaturated fatty acids are oleic acid and erucic acid.
In addition, nitrocellulose, cellulose acetate propionate resin, and cellulose acetate butyrate resin can be incorporated into the ink composition for the purpose of improving blocking resistance.

<Nitrated cotton>
As the nitrocellulose, nitrocellulose that has been conventionally used in gravure printing ink compositions can be used. The nitrocellulose is obtained by reacting natural cellulose with nitric acid to replace three hydroxyl groups in the 6-membered ring of the anhydride glucopyranose group in the natural cellulose with nitric acid groups. As the nitrocellulose used in the present invention, those having a nitrogen content of 10 to 13% and an average degree of polymerization of 35 to 90 are preferably used. Specific examples include SS1/2, SS1/4, SS1/8, TR1/16, NC RS-2, (KCNC, manufactured by KOREA CNC) and the like. The amount of nitrocellulose used is preferably 2.0% by mass or less in the black gravure printing ink composition for lamination.

<Cellulose acetate propionate resin>
As the cellulose acetate propionate resin, cellulose acetate propionate resins conventionally used in gravure printing ink compositions can be used.
Cellulose acetate propionate resin is obtained by hydrolyzing after tri-esterifying cellulose with acetic acid and propionic acid. In general, resins containing 0.6 to 2.5% by mass of acetyl groups, 42 to 46% by mass of propionate groups, and 1.8 to 5% by mass of hydroxyl groups are commercially available. The amount of the cellulose acetate propionate resin used is preferably 3.0% by mass or less in the black gravure printing ink composition for laminate.

<Cellulose acetate butyrate resin>
As the cellulose acetate butyrate resin, cellulose acetate butyrate resins conventionally used in gravure printing ink compositions can be used.
Cellulose acetate butyrate resin is obtained by hydrolysis after triesterification with acetic acid and butyric acid. In general, resins containing 2 to 30% by mass of acetylation, 17 to 53% by mass of butyrylation, and 1 to 5% of hydroxyl groups are commercially available. The amount of the cellulose acetate butyrate resin used is preferably in the range of 0.1 to 3.0% by mass in the black gravure printing ink composition for lamination.

<Other materials>
Various additives such as an antistatic agent and a plasticizer can be further added to the black gravure printing ink composition for laminate of the present invention.

(Method for producing black gravure printing ink composition for laminate of the present invention)
A known method can be used as a method for producing the black gravure printing ink composition for laminate of the present invention using the constituent materials described above. Specifically, for example, a mixture of carbon black, a pigment having a phthalocyanine skeleton, a binder resin, an organic solvent, water, and optionally a pigment dispersant is kneaded using a high-speed mixer, ball mill, sand mill, attritor, or the like. The meat can be obtained by adding and mixing the rest of the ingredients such as predetermined additives.

(Printing ink composition for gravure laminate used in printing)
Other gravure laminate printing ink compositions that can be printed before and after, particularly before, printing with the black gravure printing ink composition for laminate of the present invention may be gravure printing ink compositions having known compositions.

[Method for producing laminated printed matter using black gravure printing ink composition for lamination]
Next, a method for obtaining a laminate printed matter using the black gravure printing ink composition for laminate of the present invention will be described.
The laminate printed matter of the present invention includes at least the following printing method. For example, a black gravure printing ink composition for lamination is printed at least once on a known resin film serving as a substrate for lamination by a gravure printing method. Next, another ink composition for gravure laminate printing is gravure-printed on any part of the surface side of the black gravure printing ink composition layer for lamination formed by these printings (the lower layer side when viewed from the surface layer after the final lamination). Print using the above method and dry with a dryer.
A laminated printed matter for packaging bags can be obtained by laminating a resin film or the like by various methods on the side of the layer of the ink composition for gravure laminate printing of the printed matter obtained by the above method. As this lamination processing method, there is an extrusion lamination method in which an anchor coating agent is applied to the surface of the printed matter and then a molten polymer is laminated, and a dry lamination method in which an adhesive is applied to the surface of the printed matter and then a film polymer is laminated. law is available.

In the extrusion lamination method, if necessary, the surface of the printed matter including the layer of the ink composition is coated with an anchor coating agent such as titanium, urethane, imine, or polybutadiene, and then a known extrusion lamination machine is applied. is a method of laminating a molten polymer, and it is also possible to laminate a sandwich with another material using a molten resin as an intermediate layer.
Conventionally used resins such as low-density polyethylene, ethylene-vinyl acetate copolymer, and polypropylene can be used as the molten polymer used in the extrusion lamination method. Among them, low-density polyethylene, which is easily oxidized to generate carbonyl groups when melted, enhances the effect of the present invention.

In addition, the dry lamination method is a method of applying a urethane-based, isocyanate-based, or other adhesive to the surface of the layer formed by the ink composition for gravure laminate printing, and then laminating a film-like polymer by a known dry laminating machine. is. Polyethylene, non-stretched polypropylene, and the like can be used as the resin for the film used in the dry lamination method. In order to obtain a packaging material that is particularly used for retort applications, it is also possible to laminate by sandwiching an aluminum foil between the substrate and the resin film to be laminated. Such a laminated product can also be used for boiling and retorting after making a bag and filling it with contents.
Examples of the resin film used at this time include stretched and non-stretched polyolefins such as polyethylene and polypropylene, polyester, nylon, cellophane, and vinylon. Further, for these resin films, it is also possible to use a film obtained by processing a resin film in advance, such as coating and kneading an antifogging agent, surface coating and kneading a matting agent.

EXAMPLES The present invention will be described in more detail below with reference to Examples, but the present invention is not limited only to these Examples. Unless otherwise specified, "%" means "% by mass" and "parts" means "mass parts". In addition, the number of the amount of each material in the table is also "mass part". The unit of acid value is mgKOH/g.

<Production example of polyurethane resin varnish A (not biomass polyurethane, amine value 3.4)>
100 parts by mass of 3-methyl-1,5-pentylene adipate diol having an average molecular weight of 2000, 100 parts by mass of polypropylene glycol having an average molecular weight of 2000, and 44.4 parts by mass of isophorone diisocyanate was charged and reacted at 100 to 105° C. for 6 hours while nitrogen gas was introduced. After allowing to cool to near room temperature, 518 parts by mass of ethyl acetate and 91 parts by mass of isopropyl alcohol are added, 15.6 parts by mass of isophoronediamine is added to extend the chain, and 0.49 parts by mass of monoethanolamine and 0.49 part by mass of ethylenediamine are added. 48 parts by mass was added to terminate the reaction to obtain polyurethane resin varnish A (solid content: 30 mass %, amine value: 3.4 mgKOH/g).

<Production example of polyurethane resin varnish B (not biomass polyurethane, amine value 6.4)>
200 parts by mass of 3-methyl-1,5-pentylene adipate diol having an average molecular weight of 2000, 17.6 parts by mass of isophorone diisocyanate, and 21 parts by mass of hydrogenated MDI were placed in a four-necked flask equipped with a stirrer, a condenser tube and a nitrogen gas inlet tube. 0.0 part by mass was charged and reacted at 100 to 105° C. for 6 hours while nitrogen gas was introduced. Allow to cool to near room temperature, add 400 parts by mass of ethyl acetate and 171 parts by mass of isopropyl alcohol, add 8.2 parts by mass of isophoronediamine for chain extension, and further add 0.35 parts by mass of monoethanolamine to react. Thereafter, 1.3 parts by mass of isophoronediamine and 0.6 parts by mass of diethylenetriamine were added to terminate the reaction to obtain polyurethane resin varnish B (solid content: 30% by mass, amine value: 6.4 mgKOH/g).

<Production example of polyurethane resin varnish C (not biomass polyurethane, amine value 5.2)>
100 parts by mass of 3-methyl-1,5-pentylene adipate diol having an average molecular weight of 2000, 100 parts by mass of polypropylene glycol having an average molecular weight of 2000, and 44.4 parts by mass of isophorone diisocyanate was charged and reacted at 100 to 105° C. for 6 hours while nitrogen gas was introduced. After allowing to cool to near room temperature, 518 parts by mass of ethyl acetate and 91 parts by mass of isopropyl alcohol are added, 15.6 parts by mass of isophoronediamine is added for chain extension, and 0.24 parts by mass of monoethanolamine and 0.24 part by mass of ethylenediamine are added. 7 parts by mass was added to stop the reaction, and a polyurethane resin varnish C (solid content: 30 mass %, amine value: 5.2 mgKOH/g) was obtained.

<Production example of polyurethane resin varnish D (biomass polyurethane, amine value 6.4)>
Sebacic acid (derived from castor oil) / succinic acid (derived from plant) = 70/30 (mass ratio) and malic acid (sebacic acid + succinic acid) were added to a four-necked flask equipped with a stirrer, a condenser, and a nitrogen gas introduction tube. 200 parts by mass of a polyester diol having an average molecular weight of 2000 obtained from 1,3-propanediol (derived from a plant), 17.6 parts by mass of isophorone diisocyanate, and 21.0 parts by mass of hydrogenated MDI were charged, and nitrogen gas was added. was introduced for 6 hours at 100-105°C. Allow to cool to near room temperature, add 400 parts by mass of ethyl acetate and 171 parts by mass of isopropyl alcohol, add 8.2 parts by mass of isophoronediamine for chain extension, and further add 0.35 parts by mass of monoethanolamine to react. After that, 1.3 parts by mass of isophoronediamine and 0.6 parts by mass of diethylenetriamine were added to stop the reaction to obtain polyurethane resin varnish D (solid content: 30% by mass, amine value: 6.4 mgKOH/g).

(Carbon black)
Carbon black A: average particle size 56 nm, DBP oil absorption 45 ml/100 g,
Specific surface area 45 m ² /g, pH 9
Carbon black B: average particle size 40 nm, DBP oil absorption 47 ml/100 g,
Specific surface area 60 m ² /g, pH 2.8
(Pigment having a phthalocyanine skeleton)
Pigment A having a phthalocyanine skeleton: PB15:4
Pigment B having a phthalocyanine skeleton: PB15:3
(vinyl chloride/vinyl acetate copolymer)
Solbin TA-3, manufactured by Nissin Chemical Industry Co., Ltd.
(vinyl chloride/acrylic copolymer)
Vinyl chloride/2-hydroxypropyl acrylate=84/16 (weight average molecular weight: 45,000) was dissolved in propyl acetate to prepare a varnish with a solid content of 30% by mass.
(chlorinated polypropylene)
40 parts by mass of chlorinated polypropylene (solid content: 50%) having a chlorination degree of 40% and a number average molecular weight of 100,000 and 60 parts by mass of methylcyclohexane were mixed and stirred to obtain a chlorinated polypropylene varnish 1 with a solid content of 20%.
(Rosin and its derivatives)
Polymerized rosin: acid value 160 mgKOH/g
(dammar resin)
50 parts of commercially available natural dammar resin (solid) was dissolved in 50 parts of methylcyclohexane to obtain a dammar resin solution having a solid content of 50%.
(silica particles)
Average particle size: 4.5 μm silica (polyethylene wax)
Average particle size: 2.11 μm polyethylene wax (mixed solvents 1 and 2)
Ethyl acetate/propyl acetate/isopropyl alcohol = 50/30/20

<Production example of black gravure printing ink composition for laminate>
Each carbon black, a pigment having a phthalocyanine skeleton, polyurethane resin varnishes A to D, and a vinyl chloride/vinyl acetate copolymer (Solbin TA-3, manufactured by Nissin Kagaku Kogyo Co., Ltd.) were mixed so as to have the formulation shown in Table 1, and red Knead using a paint conditioner manufactured by Deville, and add at least one selected from rosin and its derivatives, chlorinated polypropylene, dammar resin, silica particles, polyethylene wax, ethylenebisstearic acid amide, mixed solvent 1, and water. , black gravure printing ink compositions for laminates of Examples 1 to 13 and Comparative Examples 1 to 3 shown in Table 1 were obtained.
(Storage stability of ink)
Each of the black gravure printing ink compositions for laminate obtained above was collected in a glass bottle and stored at an ambient temperature of 60° C. for 14 days. Table 1 shows the results.
A: No sedimentation observed, ink storage stability B: Sedimentation observed, ink storage stability poor

<Production of laminate>
100 parts by mass of each black gravure printing ink composition for laminating was diluted with mixed solvent 2 according to the formulation shown in Table 1, and Rigo Cup NO. 3 adjusted the viscosity to 15 seconds. A black gravure printing ink composition for lamination was printed on the treated surface of various films using a gravure printing machine under the following conditions and dried to obtain a printed material for lamination, and then the guide roll removal during printing was evaluated. . Also, using the obtained laminated printed matter, blocking resistance, adhesiveness, guide roll removal, extrusion lamination strength, retort resistance and doctor wear were evaluated. The results are shown in Table 1. A specific evaluation method is shown below.
Note that the extrusion lamination strength was evaluated by selecting a nylon film, which is more difficult to obtain an appropriate lamination strength than other resins.
(Printing method/Printing conditions)
Room environment during printing: temperature 25°C, humidity 50%
Coating machine: Gravure printing machine
Coating speed: 150m/min
Printing plate: Direct 175 line 28 μm solid plate Drying temperature: 55°C

<About film>
PET: polyethylene terephthalate film with corona discharge treatment on one side,
Toyobo Co., Ltd., E-5101, thickness 12 μm
OPP: corona discharged biaxially oriented polypropylene film;
Toyobo Co., Ltd. P-2161, thickness 25 μm
NY: Nylon film, manufactured by Toyobo Co., Ltd., N-1102, thickness 15 μm

(Doctor wear)
The ink compositions of the above Examples and Comparative Examples were printed with a gravure printer at a printing speed of 100 m/min.
A: Plate fogging, solid streaks, two-to-two stains (linear stains), etc. do not occur B: Plate fogging, solid streaks, two-two stains (linear stains), etc. occur slightly C: Plate fogging, solid streaks, two-to-two stains (linear stains) ) occur frequently

(Blocking resistance)
The printed surface of each film printed one day after printing with each test ink was put together with the untreated surface of each film, and a load of 400 g/cm ² was applied and allowed to stand at 40°C for 12 hours, and then each film was peeled off. Blocking resistance was evaluated from the state of time.
A: There is no resistance when the film is peeled off, and the ink does not peel off from the printed surface. B: There is resistance when the film is peeled off, but the ink does not peel off from the printed surface. C: Resistance when the film is peeled off. and the ink peels off from the printed surface.

(guide roll taken)
The slidability was evaluated by guide roll removal.
After printing, a test was conducted to determine whether ink adhered to the guide roll (guide roll removal) by the following method, and printability was evaluated. In addition, since the ink that has once adhered to the guide roll transfers to the printing surface again and causes staining, if "guide roll removal" occurs, it adversely affects the ability to obtain a decorative printed matter.
The presence or absence of dropout of the ink film on the printed matter by the guide roll of the gravure printing machine was visually evaluated.
A: None B: Some C: Yes

(Adhesiveness)
After rubbing the printed surface of each printed matter immediately after printing with the abdomen of the thumb twice, a cellophane tape was attached, and the adhesiveness was evaluated from the ratio of the area where the ink film was peeled off from the adherend when the tape was peeled off. bottom.
A: Not peeled at all B: The peeled area is less than 10% C: The peeled area is 10% or more and less than 20% D: The peeled area is 20% or more

(Extrusion laminate strength)
An isocyanate anchor coating agent (A-3210/A-3072, manufactured by Mitsui Chemicals, Inc.) was applied to each printed nylon film after printing, and molten polyethylene was laminated by an extrusion laminator to obtain an extrusion laminated product. After leaving these laminated products at 40° C. for 3 days, they were cut into pieces having a width of 15 mm, and the T-peel strength was measured using a peel tester manufactured by Yasuda Seiki Seisakusho.
A: 2.0N or more B: 1.5N or more and less than 2.0N C: Less than 1.5N

(Retort resistance)
A urethane-based adhesive (Takelac A-616/Takenate A-65, manufactured by Mitsui Chemicals SKC Polyurethane Co., Ltd.) was applied to each printed material after printing in an amount of 2.0 g/m ² in solid content, and then a dry lamination machine was applied. A non-stretched polypropylene film (RXC-3, thickness 60 μm, manufactured by Tohcello Co., Ltd.) was laminated at , and left at 40° C. for 3 days to obtain a dry laminate. A mixture of 90% by mass of water and 10% by mass of salad oil is packed into a bag from this dry laminate, sealed, and then immersed in pressurized hot water at 135°C for 30 minutes. The retort resistance was evaluated from
A: No lamination is observed at all.
B: A pinhole-like or partially thin and short lamination float is observed.
C: Long stripe-like lamination lift is observed on the entire surface.

According to each example, which is an example according to the present invention, the storage stability, adhesiveness, blocking resistance, and retort resistance of the ink are good, and the abrasion of the doctor is small, and the guide roll is not removed. have an effect.
On the other hand, according to Comparative Examples 1 and 2, in which the amount of the pigment having a phthalocyanine skeleton is small, abrasion of the doctor is large. The strength is reduced, and films of various materials cannot be laminated.

Claims (8)

A black gravure printing ink composition for lamination containing a binder resin, carbon black, an organic solvent, and water,
Containing a polyurethane resin as a binder resin,
A black gravure printing ink composition for laminate containing 0.1 to 3.0 % by mass of a pigment having a phthalocyanine skeleton relative to carbon black. 2. The polyurethane resin according to claim 1, wherein the polyurethane resin has at least one selected from a primary amino group and a secondary amino group at the end of the molecule and has an amine value of 1 to 10 mgKOH/g. A black gravure printing ink composition for laminates. The polyurethane resin is a polyurethane resin having a hydroxyl group, at least one selected from primary amino groups and secondary amino groups at the molecular terminal, and having an amine value of 1 to 10 mgKOH/g. 3. The black gravure printing ink composition for laminate according to 1 or 2. Any one of claims 1 to 3, wherein the polyurethane resin contains a biopolyurethane resin, and the content of the vegetable oil-derived component in the solid content (excluding the pigment) of the black gravure printing ink composition for laminate is 3 to 70% by mass. The black gravure printing ink composition for laminate according to 1. The biopolyurethane resin is a biopolyurethane resin obtained by reacting a polyol component and an isocyanate component, and the polyol component includes a plant-derived short-chain diol component having 2 to 4 carbon atoms and a plant-derived carboxylic acid component. 5. The black gravure printing ink composition for lamination according to claim 4, comprising a biopolyester polyol reacted with The black gravure printing ink composition for laminate according to any one of claims 1 to 5, further comprising a vinyl chloride/vinyl acetate copolymer resin and/or a vinyl chloride/acrylic copolymer resin as a binder resin. The black gravure printing ink composition for laminate according to any one of claims 1 to 6, which contains at least one selected from rosin and its derivatives, dammar resin, chlorinated polypropylene, silica, polyethylene wax, and fatty acid amide. The black gravure printing ink composition for laminate according to any one of claims 1 to 7, except for the case where the pigment having a phthalocyanine skeleton has an acidic substituent.