JP2023081284A - Primer composition for desorption, and printed matter - Google Patents

Abstract

To surely bond a base material to a printing layer during usage, and more simply separate and desorb the printing layer from the base material after usage and then easily separate and desorb the printing layer from a desorption liquid.SOLUTION: A primer composition for desorption contains a polybutadiene-based compound for forming a primer layer for desorption of a printed matter in which a resin base material, the primer layer for desorption and a printing layer are formed in this order.SELECTED DRAWING: None

Description

TECHNICAL FIELD The present invention relates to a desorption primer composition and printed matter.

BACKGROUND ART Packaging materials using various plastic films are used for food, confectionery, household goods, pet food, and the like from the viewpoints of design, economy, protection of contents, transportability, and the like. In addition, many packaging materials are subjected to gravure printing or flexographic printing with the intention of imparting designs and messages appealing to consumers.
In order to obtain these packaging materials, continuous printing is performed on the surface of the base film of the packaging material, or an adhesive or anchor is applied to the printed surface of the base film of the packaging material as necessary. An agent is applied and printing is performed to laminate the film.
In the printing for laminating films, after sequentially printing a color ink composition and a white ink composition on various films such as polyester, nylon and aluminum foils, an adhesive is applied onto the printed layer of the white ink composition. A polyethylene film, a polypropylene film, or the like is laminated for the purpose of heat sealing by dry lamination processing using , extrusion lamination processing using an anchor coating agent, or the like (see Patent Document 1).

In recent years, packages, plastic bottles, and other plastic products made from plastic film have been discarded or dumped into the ocean as garbage, posing a problem of environmental pollution. These plastic products are decomposed in seawater to become submicron-sized fragments (microplastics) and float in seawater. When the plastic is ingested by marine organisms such as fish, it is concentrated in the organism. In that case, there is concern that the health of seabirds and humans who consume the marine organisms as food may also be affected.

As one of various efforts to reduce microplastics in order to improve such problems, a recycling method has been proposed in which the plastic base material of the laminate is removed from the laminate obtained by laminating the printing ink composition. . As a method for detaching the laminate plastic substrate, a detachment ink composition (see, for example, Patent Document 2), a detachment adhesive (see, for example, Patent Document 3), a detachment anchor coating agent, etc. ( For example, see Patent Documents 4 to 6) and desorption liquids (see Patent Document 7, for example) have been proposed.
However, in these methods, desorption with hot water as a desorption liquid is not sufficient, and when used in a laminate printing ink composition, there is a problem of insufficient lamination suitability.
There is also a laminate in which printing is applied to the paper substrate side of laminated paper, in which an adhesive is applied to the substrate film and the paper substrate is bonded. There was a problem that the adhesive remained on the film.

JP-A-5-97959 Japanese Patent No. 6631964 Japanese Patent No. 6642688 Japanese Patent No. 6388131 JP-A-2020-175620 International publication 2021-090690 Japanese Patent No. 6690806

The present invention aims to ensure that the substrate and the printed layer can be reliably bonded during use, and that the printed layer can be more easily separated from the substrate after use, and the printed layer can be easily separated and detached from the detachment liquid after that. Make it an issue. Another object of the present invention is to facilitate separation and detachment of an adhesive layer from a base film of a laminate obtained by laminating a paper base material on a base film with an adhesive layer interposed therebetween.

The present inventors have found that the above problems can be solved by providing the desorption primer composition and the printed matter described below, and have completed the present invention.
1. A detachment primer composition containing a polybutadiene-based compound, for forming the detachment primer layer of a printed matter formed in the order of a resin base material, a detachment primer layer, and a printed layer.
2. 2. The detachment primer composition according to 1, wherein the polybutadiene compound is a hydroxyl group-containing polybutadiene compound and/or a carboxyl group-containing polybutadiene compound.
3. 3. A printed material comprising a resin substrate, a detachable primer layer formed from the detachable primer composition according to 1 or 2, and a print layer formed on the detachable primer layer.
4. A detachment primer layer formed from the detachment primer composition according to 1 or 2 is formed on a resin substrate, and a paper layer is formed on the detachment primer layer with an adhesive layer interposed therebetween to form a paper A printed matter in which a printed layer is formed on a layer.

According to the present invention, the substrate and the printed layer can be reliably bonded during use, the printed layer can be easily separated from the substrate after use, and the printed layer can be easily separated and detached from the detachment liquid. be able to.

The present invention is based on the following matters, and can be used for various printing methods and printed matter for various purposes. In the specification of the present application, the desorption primer composition of the present invention is sometimes simply referred to as "primer composition".
The present invention is significant in adopting a desorption primer layer having a specific composition.

[Primer composition for desorption]
The detachment primer composition of the present invention is a composition for forming a primer layer provided so as to be positioned between the surface of the resin substrate and the printed layer. Then, when reusing the printed matter after using it, the resin film or the like that is the resin base material for the printed matter is separated from the printed layer formed thereon, and a detachment is performed to remove the printed layer from the resin base material. It is a release primer composition.
Since the present invention is a primer composition for detachment, for example, it can be used as an anchor coat agent when forming an anchor coat layer on a printed surface formed on a resin substrate and laminating a resin film or the like thereon. differ in their uses and desired properties.
The detachable primer composition of the present invention is a composition for forming a primer layer in advance on a printing substrate before printing the printing ink composition.
The desorption primer composition contains a polybutadiene compound. The desorption primer composition is preferably an aqueous composition. A polybutadiene compound into which a hydroxyl group or a carboxyl group is introduced is preferable in order to make it water-based and to improve adhesion. In addition, it is preferable that the polybutadiene compound is not cross-linked in order to exhibit releasability.
Further, the detachment primer composition of the present invention is preferably based on a solvent comprising a mixture of water and one or more alcohols selected from among methanol, ethanol and isopropyl alcohol.
Examples of the desorption primer composition of the present invention include EL-451 (Toyo-Morton Co.), Chitabond T-180E (Nippon Soda Co.) and the like. They are sometimes used as anchor coating agents. When used as an anchor coating agent, the only purpose is to positively adhere a material having a different composition to the base material to integrate the material. However, in the present invention, the polybutadiene-based compound does not simply function as an anchor coating agent, but has both releasability and adhesiveness as a primer composition, which are contradictory properties.
The coating amount of the solid content of the polybutadiene-based compound on the printing substrate is preferably 0.010 g/m ² or more, more preferably 0.015 g/m ² or more, and still more preferably 0.020 g/m ² or more. It is preferably 0.400 g/m ² or less, more preferably 0.300 g/m ² or less, even more preferably 0.200 g/m ² or less, and most preferably 0.100 g/m ² or less.
The desorption primer composition may or may not contain polyolefin resin particles, inorganic metal salts, or organic metal salts.

<Method for producing desorption primer composition)
The detachable primer composition can be obtained by adding a solvent to the polybutadiene compound and stirring. As the solvent, a mixture of water and one or more alcohols such as methanol, ethanol, and isopropyl alcohol can be used.

[Resin base material]
As the resin base material in the present invention, a base material made of a known resin whose surface can be printed can be employed. Examples of such resin substrates include polyesters such as polyethylene terephthalate (PET), polyolefins such as polyethylene (PE) and polypropylene (PP), resin films such as polyamides such as nylon, and the above resin films having a metal layer such as aluminum. The above resin film having a transparent deposition layer, a shrinkable polypropylene film (especially a shrinkable untreated polypropylene film), a shrinkable polyvinyl chloride film, a shrinkable plastic film such as a shrinkable polyethylene phthalate film, and the like can be used.
However, as the resin substrate, a laminate having a thermoplastic resin layer and an ethylene-based resin layer may or may not be used.
As such a resin substrate, a resin film that serves as a substrate for known lamination described below, a resin film for surface printing or shrink printing, a resin film laminated to a paper substrate, or the like can be employed.
Furthermore, after a printing ink composition layer is formed on a base material via a release primer composition layer, the release primer composition of the present invention is applied onto the printed layer, followed by dry lamination or extrusion lamination. A sealant layer may be formed by a method.

[Print format]
The detachable primer composition of the present invention is formed so that the detachable primer layer is positioned between the surface of the resin substrate and the printed layer in the method of printing on the resin substrate. Then, it is used in reverse printing, surface printing, shrink printing, and the like. Moreover, in the printed material formed in the order of the resin substrate, the detachable primer layer, and the printed layer, any known layer may be further formed between any of these layers or on the surface of the printed material. When forming the resin substrate, the detachment primer layer, the adhesive layer and the paper layer, any known layer may be further formed between any of these layers or on the surface of the obtained laminate. can be
Also, in the method of printing on the paper base side surface of laminated paper in which an adhesive is applied to the base film and the paper base is bonded, a detachable primer layer is formed between the base film and the adhesive layer. formed to be located.
Hereinafter, printing methods using the detachment primer composition of the present invention are back printing, surface printing, shrink printing, and laminated paper in which an adhesive is applied to a base film and a paper base is bonded. Printing on the paper substrate side (hereinafter sometimes referred to as "printing on the paper substrate side of laminated paper") will be described in order.

(Pigment) (Component that can be contained in common in the reverse printing ink composition, the front printing ink composition, and the shrink printing ink composition)
In printing using the primer composition of the present invention, one or more of conventionally used inorganic and organic pigments can be used as the pigment contained in the printing ink composition.
Examples of inorganic pigments include colored pigments such as titanium oxide, red iron oxide, antimony red, cadmium yellow, cobalt blue, Prussian blue, ultramarine blue, carbon black, and graphite. Examples of extender pigments include silica particles, calcium carbonate, kaolin, clay, and sulfuric acid. Barium, aluminum hydroxide, talc and the like can be mentioned. Among them, it is preferable to use titanium oxide as the white pigment.
Examples of organic pigments include soluble azo pigments, insoluble azo pigments, azo lake pigments, condensed azo pigments, copper phthalocyanine pigments, and condensed polycyclic pigments.
The content of these pigments in the printing ink composition is usually about 1 to 50% by mass.

(Pigments used in ink compositions for printing on the paper substrate side of laminated paper in which an adhesive is applied to a substrate film and the paper substrate is bonded)
Pigments conventionally used in flexographic printing ink compositions can be used as the pigments used in the ink composition for printing on the paper substrate side.
Specific examples of inorganic pigments include colored pigments such as titanium oxide, red iron oxide, antimony red, cadmium yellow, cobalt blue, Prussian blue, ultramarine blue, carbon black, and graphite. Examples of organic pigments include soluble azo pigments, insoluble azo pigments, azo lake pigments, condensed azo pigments, copper phthalocyanine pigments, and condensed polycyclic pigments. The above pigments may be used alone or in combination of two or more.
The concentration of the above pigment in the flexographic printing ink composition is 5 to 60% by weight, usually 6 to 35% by weight for organic pigments and 30 to 60% by weight for inorganic pigments.

[Print layer]
<< Reverse printing >>
The printing ink composition for reverse printing contains a binder resin and various additives in addition to the above pigments.
<Binder resin>
The binder resin contained in the reverse printing ink composition includes a polyurethane resin. A polyurethane resin having an amine value is preferably included in terms of the stability, adhesiveness and lamination suitability of the printing ink composition.

(polyurethane resin)
The polyurethane resin may contain a non-acid-modified polyurethane resin and/or an acid-modified polyurethane resin. A polyurethane resin that has not been acid-modified is a polyurethane resin that does not have an acidic group such as a carboxylic acid group, a sulfonic acid group, or a phosphoric acid group at the molecular terminal and/or at other locations in the molecule. Acid-modified polyurethane resins include polyurethane resins having acidic groups such as carboxylic acid groups, sulfonic acid groups, and phosphoric acid groups at the molecular ends and/or at other locations in the molecule.
Even if it is formed from an ink composition using an acid-modified polyurethane resin as a vehicle, or if it is formed from an ink composition using a resin such as a non-acid-modified polyurethane resin, which is inherently difficult to remove, as a vehicle, The printed layer can be smoothly removed from the resin substrate.

Polyurethane resins commonly used in printing ink compositions can be used as such polyurethane resins.
Among them, a polyurethane resin having an amino group (having an amine value) is preferable from the viewpoint of the stability over time of the printing ink composition, adhesiveness, and suitability for lamination. Among polyurethane resins having amino groups, one or more selected from primary amino groups, secondary amino groups and tertiary amino groups at the molecular terminals, particularly primary amino groups and secondary amino groups at the molecular terminals. Polyurethane resins having one or more selected from amino groups are more preferred.
More preferably, it is a polyurethane resin having a hydroxyl group and one or more selected from a primary amino group, a secondary amino group and a tertiary amino group at the terminal of the molecule.
The polyurethane resin has a specific functional group such as the amino group, so that the printing ink composition for reverse printing has excellent printability and adhesiveness.
The amine value of the polyurethane resin is preferably 1.0 to 15.0 mgKOH/g, more preferably 2.0 to 8.0 mgKOH/g. If the amine value is less than 1.0 mgKOH/g, the adhesion of the film printing ink composition of the present invention to films may be reduced, and laminating suitability may be reduced. If it exceeds 0 mgKOH/g, blocking resistance may decrease.
In the present invention, the amine value means the amine value per 1 g of solid content, and is measured using a 0.1N aqueous solution of hydrochloric acid using a potentiometric titration method (e.g., COMTITE (AUTO TITRATOR COM-900, BURET B-900, TITSTATION K-900), Hiranuma Sangyo Co., Ltd.) and then converted to the equivalent of potassium hydroxide.
Moreover, from the viewpoint of resolubility, the polyurethane resin preferably has hydroxyl groups at the molecular terminals and at sites other than the molecular terminals.

(Polyurethane resin not acid-modified)
Polyurethane resins that are not acid-modified are preferably polyurethane polyurea resins and/or polyurethane polyurea resins obtained by using a compound in which the amino group of a polyamine compound is ketiminated with a ketone compound.
The polyurethane-polyurea resin is a polyurethane-polyurea resin obtained by subjecting a urethane prepolymer obtained from an organic diisocyanate component and a polymeric diol component to chain extension and/or terminal termination.
The polyurethane polyurea resin obtained using the ketiminized compound contains a. a polyurethane polyurea resin obtained by reacting a compound in which the amino group of a polyamine compound is ketiminized with a ketone compound in an organic solvent with a urethane prepolymer; b. A polyurethane polyurea resin obtained by adding a compound in which the amino group of a polyamine compound is ketiminized with a ketone compound in an organic solvent to a urethane prepolymer, stirring and mixing, and then adding water, followed by chain elongation and reaction termination, By using a and/or b, the amine odor of the reverse printing ink composition is reduced and the stability over time is excellent.
The polyurethane-polyurea resin may contain a biomass polyurethane-polyurea resin in consideration of environmental aspects.

(Polyurethane polyurea resin not acid-modified)
A polyurethane polyurea resin that has not been acid-modified has one or more selected from primary amino groups and secondary amino groups at the terminal of the molecule.
More preferably, it is an acid-free polyurethane polyurea 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.
As these polyurethane polyurea resins, a polyurethane resin obtained by synthesizing a urethane prepolymer by reacting an organic diisocyanate compound and a high-molecular-weight diol compound and reacting it with the following chain extender and reaction terminator is preferably used. Available.

(Synthesis of urethane prepolymer)
Each of the above urethane prepolymers is obtained by reacting the following organic diisocyanate compound with a polymer diol compound.

(Organic diisocyanate compound)
Examples of the organic diisocyanate compounds include aromatic diisocyanate compounds such as tolylene diisocyanate, alicyclic diisocyanate compounds such as 1,4-cyclohexane diisocyanate, isophorone diisocyanate, dicyclohexylmethane-4,4-diisocyanate (hydrogenated MDI), Aliphatic diisocyanate compounds such as hexamethylene diisocyanate and araliphatic diisocyanate compounds such as α,α,α',α'-tetramethylxylylene diisocyanate can be used. These organic diisocyanate compounds can be used singly or in combination of two or more. Among them, alicyclic diisocyanate compounds, aliphatic diisocyanate compounds and araliphatic diisocyanate compounds are more preferable.

In addition, as other organic diisocyanate compounds, aromatic Diisocyanate compounds, alicyclic diisocyanate compounds such as cyclohexylene diisocyanate and methylcyclohexylene diisocyanate (hydrogenated TDI), aliphatic diisocyanates such as ethylene diisocyanate, tetramethylene diisocyanate, dodecamethylene diisocyanate, and 2,2,4-trimethylhexamethylene diisocyanate Compounds and araliphatic diisocyanate compounds such as m- and/or p-xylylene diisocyanate (XDI) can also be utilized.
When other organic diisocyanate compounds are used in combination, they can be used together so that the number of isocyanate groups of the other organic diisocyanate compounds is 50% or less with respect to the total number of isocyanate groups of all the organic diisocyanate compounds, but more preferably. It is 30% or less, more preferably 10% or less.
Alternatively, other organic diisocyanate compounds are 50 parts by mass or less, more preferably 30 parts by mass or less, still more preferably 10 parts by mass or less in 100 parts by mass of all organic diisocyanate compounds.

(Polymer diol compound)
Examples of the polymer diol compounds 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 kinds can 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.

The polymer diol compound preferably has a number average molecular weight of 1,000 to 8,000, more preferably 1,000 to 5,500, and further preferably 1,000 to 4,000. preferable.
Further, as the polymer diol compound, one containing 3-methyl-1,5-pentylene adipate diol can be selected.
At this time, as other polymer diol compounds, the following can be used in combination.
Polymeric diol compounds other than 3-methyl-1,5-pentylene adipate diol include one or more of dibasic acids such as adipic acid, sebacic acid and phthalic anhydride, ethylene glycol, propylene glycol, Polyester diols, polycaprolactone diols, etc. obtained by condensation reaction with one or more of glycols such as 1,4-butanediol, neopentyl glycol, and 3-methyl-1,5-pentanediol. Examples include polyester diol compounds, polyether diol compounds such as polyalkylene glycols such as polyethylene glycol and polypropylene glycol, and alkylene oxide adducts such as ethylene oxide and propylene oxide of bisphenol A. These polymer diol compounds can be used singly or in combination of two or more.

Among the above, 3-methyl-1,5-pentyleneadipatediol having a number average molecular weight of 1,000 to 8,000 obtained by condensation reaction of adipic acid and 3-methyl-1,5-pentanediol is Preferred is 3-methyl-1,5-pentylene adipate diol having a number average molecular weight of 1,000 to 4,000.
When other polymer diol compounds are used in combination, they can be used together so that the number of hydroxyl groups of the other polymer diol compounds is 70% or less with respect to the total number of hydroxyl groups of all the polymer diol compounds, and more preferably 55. % or less, more preferably 40% or less.
Alternatively, other polymer diol compounds are 50 parts by mass or less, more preferably 35 parts by mass or less, still more preferably 20 parts by mass or less in 100 parts by mass of all polymer diol compounds.
When the organic solvent of the printing ink composition for back printing uses a mixed solvent system (hereinafter sometimes referred to as a "mixed solution") of an ester solvent and an alcohol solvent, which will be described later, the polymer diol compound The use of a polyether diol compound, preferably polypropylene glycol, tends to increase the solubility of the resulting polyurethane resin, and also tends to improve printability such as gradation reproducibility and antifogging properties. It is preferable in that it is possible to design a wide range of printing ink compositions according to the desired performance.

(Biomass polyurethane polyurea resin not acid-modified)
The polyurethane resin may contain a biomass polyurethane polyurea resin that has not been acid-modified in consideration of the environment. A biomass polyurethane polyurea resin that has not been acid-modified is described below. Among the explanations of the biomass polyurethane-polyurea resin that has not been acid-modified, the explanation that is common to the above-described polyurethane-polyurea resin that has not been acid-modified will be omitted as appropriate.
Biomass polyurethane polyurea resins that have not been acid-modified are polyurethane resins containing biomass-derived (plant-derived) components. A biomass polyurethane resin that has not been acid-modified can contribute to the prevention of global warming and the reduction of environmental load compared to the use of other exhaustible resources. Then, a biomass urethane prepolymer is synthesized by reacting a biopolyester polyol compound and an organic diisocyanate compound, and if necessary, a chain extender and a reaction terminator are reacted to obtain a biomass polyurethane polyurea resin that is not acid-modified. and more preferably the isocyanate compound is a plant-derived bioisocyanate.

(isocyanate compound)
In addition to the organic diisocyanates described for the non-acid-modified polyurethane polyurea resins, vegetable oil-derived diisocyanates can be used. As the vegetable oil-derived organic diisocyanate compound, a plant-derived divalent carboxylic acid is converted to an amino terminal group by acid amidation and reduction, and then reacted with phosgene to convert the amino group to an isocyanate group. can get. Plant-derived biopolyisocyanates include dimer acid diisocyanate (DDI), octamethylene diisocyanate, decamethylene diisocyanate, and the like. A plant-derived isocyanate compound can also be obtained by using a plant-derived amino acid as a raw material and converting the amino group into an isocyanate group. For example, lysine diisocyanate (LDI) is obtained by methyl-esterifying the carboxyl group of lysine and then converting the amino group into an isocyanate group. Also, 1,5-pentamethylene diisocyanate can be obtained by decarboxylating the carboxyl group of lysine and then converting the amino group to an isocyanate group.

(Biopolyester polyol compound)
The biopolyester polyol compound (biomass polyester polyol) is described below.
In consideration of environmental aspects, biopolyester polyol compounds synthesized from materials containing plant-derived components may be used in combination as the other polymer diol compounds among the biopolyester polyol compounds.
In addition, a non-acid-modified polyurethane polyurea resin obtained by reacting a polyester polyol compound containing a bio-polyester polyol compound with the above specific isocyanate compound is mixed with the non-acid-modified polyurethane polyurea resin of the present invention. You can also use
Therefore, a biopolyester polyol obtained by reacting a short-chain diol compound having 2 to 4 carbon atoms with a carboxylic acid compound can be employed as the above biopolyester polyol compound. At least one of the short-chain diol compound and the carboxylic acid compound in the biopolyester polyol component is more preferably plant-derived, and both are more preferably plant-derived.
The plant-derived short-chain diol compound having 2 to 4 carbon atoms is not particularly limited. By way of example, the short-chain diol compound may be 1,3-propanediol, 1,4-butanediol, ethylene glycol, etc. obtained from plant materials 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. The 1,3-propanediol component produced by a bio-method such as the fermentation method described above is superior in terms of safety compared to the 1,3-propanediol component produced by the EO production method. By-products can be obtained, and the manufacturing cost can be kept low. 1,4-Butanediol can be produced by producing and fermenting glycol from plant resources to obtain succinic acid, which is then hydrogenated. Ethylene glycol can also be produced from bioethanol obtained by conventional methods via ethylene.

The plant-derived carboxylic acid compound is not particularly limited. Examples of carboxylic acid compounds include sebacic acid, succinic acid, lactic acid, glutaric acid, dimer acid, and the like. These may be used in combination. Among these, the carboxylic acid compound 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 biopolyester polyol compound is produced as a 100% plant-derived biopolyol by appropriately condensing a plant-derived short-chain diol compound and a plant-derived carboxylic acid. Specifically, plant-derived sebacic acid and plant-derived 1,3-propanediol are directly subjected to dehydration condensation to obtain polytrimethylene sebacate polyol. In addition, polybutylene succinate polyol can be obtained by direct dehydration condensation of plant-derived succinic acid and plant-derived 1,4-butanediol.
One or more of each of these biopolyester polyol compounds may be used.
The urethane prepolymer obtained using these plant-derived components may contain 10% by mass or more, or 40% by mass or more in terms of solid content in the total urethane prepolymer.

(Chain extender and reaction terminator)
Next, the chain extender and reaction terminator used in the non-acid-modified polyurethane-polyurea resin and the non-acid-modified biomass polyurethane-polyurea resin will be described.
As the chain extender, known chain extenders used in polyurethane polyurea resins as binders for printing ink compositions can be used. aliphatic diamines such as methylenediamine; alicyclic diamines such as isophoronediamine and 4,4'-dicyclohexylmethanediamine; aromatic diamines such as toluylenediamine; araliphatic diamines such as xylenediamine; (2-Hydroxyethyl)ethylenediamine (aminoethylethanolamine), N-(2-hydroxyethyl)propylenediamine, N,N'-di(2-hydroxyethyl)diamines having a hydroxyl group such as ethylenediamine, ethylene glycol, propylene Examples include diol compounds such as glycol, 1,4-butanediol, neopentyl glycol, diethylene glycol, and triethylene glycol.
Furthermore, polyamine compounds such as diethylenetriamine and triethylenetetramine can be used in combination as long as the polyurethane-polyurea resin does not gel.
As a reaction terminator for introducing a primary amino group and a secondary amino group to the terminal of a polyurethane polyurea resin, aliphatic diamines such as ethylenediamine, propylenediamine, tetramethylenediamine, hexamethylenediamine, isophorone, etc., as polyamine compounds. Diamines, alicyclic diamines such as 4,4′-dicyclohexylmethanediamine, polyamines such as diethylenetriamine and triethylenetetratriamine, aromatic diamines such as toluylenediamine, araliphatic diamines such as xylenediamine, N Diamines having a hydroxyl group such as -(2-hydroxyethyl)ethylenediamine (aminoethylethanolamine) and N-(2-hydroxyethyl)propylenediamine can be exemplified. Among these, polyamines having primary amino groups such as diethylenetriamine and triethylenetetratriamine are preferred.
As the reaction terminator for introducing hydroxyl groups into polyurethane polyurea resins, alkanolamines such as monoethanolamine and diethanolamine, and hydroxyl groups such as N-(2-hydroxyethyl)ethylenediamine and N-(2-hydroxyethyl)propylenediamine. Diamines 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.

As a method for producing the polyurethane-polyurea resin that is not acid-modified and the biomass polyurethane-polyurea resin that is not acid-modified, a known method for producing a polyurethane resin can be used as it is using the above materials. In addition, if the mass-average 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, printability and lamination suitability can be adjusted. is.
The weight average molecular weight of the non-acid-modified polyurethane polyurea resin and the non-acid-modified biomass polyurethane polyurea resin is preferably from 10,000 to 70,000, more preferably from 20,000 to 60,000. is more preferred.
Furthermore, in order to increase appropriate flexibility and laminate strength, a polyurethane resin having a weight average molecular weight of 1,000 to 70,000 and having no urea bond may be blended as the polyurethane resin.

(Reaction of organic diisocyanate compound and polymer diol compound)
In addition, when the organic diisocyanate compound and the polymer diol compound are reacted, the respective use ratios are such that the isocyanate group:hydroxy group equivalent ratio (isocyanate index) is usually 1.2:1.0 to 3.0: 1.0, more preferably 1.3:1.0 to 2.0:1.0. When the isocyanate index is less than 1.2, there is a tendency to become a flexible non-acid-modified polyurethane polyurea resin or a non-acid-modified biomass polyurethane polyurea resin, and blocking resistance, etc., when the printing ink composition is printed. may be low, in which case it may be necessary to use it in combination with other hard resins.

A catalyst can be used in the reaction between the organic diisocyanate compound and the polymeric diol compound for obtaining the non-acid-modified polyurethane polyurea resin and the non-acid-modified biomass polyurethane polyurea resin used in the present invention. .
Among them, it is preferable to use organometallic compounds, and examples of such organometallic compounds include titanium compounds such as dibutyl titanium dichloride, tetrabutyl titanate, and butoxy titanium trichloride, dibutyl tin sulfide, tributyl tin sulfide, and tributyl tin oxide. , dibutyltin dichloride, dibutyltin oxide, dibutyltin dibromide, dibutyltin dimaleate, dibutyltin dilaurate, dibutyltin diacetate, dioctyltin dilaurate, tributyltin acetate, tributyltin chloride, triethyltin ethoxide, tributyltin ethoxide, dioctyltin oxide , tributyltin trichloroacetate, and tin 2-ethylhexanoate; lead compounds such as lead oleate, lead 2-ethylhexanoate, lead benzoate, and lead naphthenate; and iron 2-ethylhexanoate. , iron acetylacetonate, cobalt benzoate, cobalt 2-ethylhexanoate, zinc naphthenate, zinc 2-ethylhexanoate, zirconium naphthenate and the like. Among these, titanium compounds such as tetrabutyl titanate are preferred.
Tertiary amine compounds can also be used, such as triethylamine, triethylenediamine, 1,4-diazabicyclo(2,2,2)octane, and 1,8-diazabicyclo(5,4,0)-undecene-7 (DBU). can be used.

(Polyurethane polyurea resin not acid-modified obtained by using a compound in which the amino group of a polyamine compound is ketiminated with a ketone compound, obtained by using a compound in which the amino group of a polyamine compound is ketiminated with a ketone compound biomass polyurethane polyurea resin that has not been acid-modified)
Non-acid-modified polyurethane polyurea resin obtained by using a compound in which the amino group of a polyamine compound is ketiminated with a ketone compound, an acid obtained by using a compound in which the amino group of a polyamine compound is ketiminated with a ketone compound The unmodified biomass polyurethane polyurea resin uses a ketimine compound obtained by converting a polyamine compound into a ketimine with an excessive amount of a ketone compound among the chain extenders and/or reaction terminators described above, c. Employing a compound in which an amino group of a polyamine compound is ketiminized with a ketone compound in an organic solvent and reacting it with a urethane prepolymer and/or a biomass urethane prepolymer, d. Employing a compound in which the amino group of the polyamine compound is ketiminized with a ketone compound in an organic solvent, adding it to the urethane prepolymer and/or the biomass urethane prepolymer, stirring and mixing, and then adding water, followed by chain elongation and reaction. By stopping, a non-acid-modified polyurethane polyurea resin and a non-acid-modified biomass polyurethane polyurea resin are produced and obtained. In particular, it is preferable to employ one or more selected from isophoronediamine, N-(2-hydroxyethyl)ethylenediamine and ethylenediamine among the above chain extenders and reaction terminators.
A polyamine compound ketiminized with a ketone compound has a structure in which the oxygen atom of the ketone compound is substituted by the nitrogen atom of the amino group of the polyamine compound.
Acetone, diethyl ketone, methyl ethyl ketone, diacetone alcohol, and methyl isobutyl ketone are preferable as the ketone compound to be used.
It is preferable not to use a solvent other than the ketone compound in this ketiminization reaction.
However, an alcohol compound can be used as a solvent other than the ketone compound. Among them, isopropyl alcohol can be used.
This use of no solvent other than the ketone compound is defined as ketiminization under solvent-free conditions. In addition, a polar organic solvent is used instead of a solvent-free condition within a range that does not hinder the subsequent chain extension reaction and the fact that the non-acid-modified polyurethane polyurea resin and the non-acid-modified biomass polyurethane polyurea resin have no odor. may be blended.
The present invention provides a non-acid-modified polyurethane polyurea resin obtained through the step of chain elongation and reaction termination by method c or d above using a ketiminated chain extender and/or reaction terminator, and It may be a printing ink composition containing a biomass polyurethane polyurea resin that has not been acid-modified, and the printing ink composition and printed prints do not develop an amine odor. In addition, it has the effect of increasing the peel strength when it is laminated on the printed surface by means of extrusion lamination or the like.
The ketiminized amine or the like may be used as a chain extender, may be used as a reaction terminator, or may be used as both a chain extender and a reaction terminator.

<Polyurethane polyurea resin not acid-modified obtained by using a compound in which the amino group of a polyamine compound is ketiminated with a ketone compound, obtained by using a compound in which the amino group of a polyamine compound is ketiminated with a ketone compound Synthesis of non-acid-modified biomass polyurethane polyurea resin>
using a ketimine compound obtained by converting a polyamine compound into a ketimine with an excessive amount of a ketone compound in advance for a urethane prepolymer and/or a biomass urethane prepolymer obtained by reacting an organic diisocyanate compound and a polymeric diol compound; . Employing a compound in which the amino group of a polyamine compound is ketiminized with a ketone compound in an organic solvent and reacting it with a urethane prepolymer and/or a biomass urethane prepolymer, f. A compound in which the amino group of the polyamine compound is ketiminized by a ketone compound in an organic solvent is adopted, added to the urethane prepolymer and/or the biomass urethane prepolymer, stirred and mixed, and water is added, followed by chain elongation and reaction termination. A non-acid-modified polyurethane polyurea resin obtained by using a compound in which the amino group of the polyamine compound is ketiminized with a ketone compound, and a compound in which the amino group of the polyamine compound is ketiminized with a ketone compound It is possible to obtain a biomass polyurethane polyurea resin that is not acid-modified.
When a solvent is used in the reaction, an ester solvent and/or an alcohol solvent is preferred, a mixture of an ester solvent and an alcohol solvent is more preferred, and propyl acetate and isopropyl alcohol are even more preferred. : isopropyl alcohol in the range of 1:1 to 5:1 is most preferred.

(acid-modified polyurethane resin, acid-modified biomass polyurethane resin)
As the polyurethane resin in the present invention, an acid-modified polyurethane resin and/or an acid-modified biomass polyurethane resin can also be employed. It may be used with the non-acid-modified polyurethane resin and/or the non-acid-modified biomass polyurethane resin, the acid-modified polyurethane resin and/or the acid-modified biomass polyurethane resin alone, or the acid-modified Only non-acid-modified polyurethane resins and/or biomass polyurethane resins that have not been acid-modified may be used.
Acid-modified polyurethane resins and acid-modified biomass polyurethane resins can be produced by reacting the polymer diol component with a tetrabasic acid anhydride such as pyromellitic anhydride as the polymer diol compound constituting the polyurethane resin, or A polymeric diol compound having a free carboxyl group obtained by ring-opening polymerization of lactones using dimethylolpropionic acid, dimethylolbutanoic acid or the like as an initiator is used, or a polymeric diol compound constituting a polyurethane resin is used. By using a hydroxycarboxylic acid such as dimethylolpropionic acid and dimethylolbutanoic acid together with dimethylolpropionic acid, those obtained by conventionally known methods can be used. The acid value of the acid-modified polyurethane resin and the acid-modified biomass polyurethane resin is preferably 70 mgKOH/g or less.

(vinyl chloride/vinyl acetate copolymer)
The vinyl chloride/vinyl acetate copolymer that may be blended in the printing ink composition for reverse printing includes vinyl chloride monomers and vinyl acetate monomers conventionally used in gravure printing ink compositions as essential components. Depending on the type, fatty acid vinyl monomers such as vinyl propionate, vinyl monochloroacetate, vinyl versate, vinyl laurate, vinyl stearate, and vinyl benzoate, monomers having functional groups such as hydroxyl groups, etc., may be used as copolymerization components by known methods. You can use the one manufactured by
A vinyl chloride/vinyl acetate copolymer having a hydroxyl group is 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 (formula 1 below) based on the reaction site of vinyl chloride in the molecule, acetic acid The physical properties and dissolution behavior of the resin are determined by the ratio of the structural unit based on the reaction 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. The structural unit based on imparts good solubility in organic solvent systems to environmentally friendly printing ink compositions.
Formula 1 -CH2-CHCl-
Formula 2 -CH2-CH(OCOCH3)-
Formula 3 -CH2-CH(OH)-

From the standpoint of solubility and printability in the organic solvent used in the printing ink composition for reverse printing, the vinyl chloride/vinyl acetate copolymer has various functional groups in its molecule. Also good.
When an environmentally friendly solvent is used as the organic solvent, the vinyl chloride/vinyl acetate copolymer preferably has a hydroxyl group content of 50 to 200 mgKOH/g. 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)
The vinyl chloride-acrylic copolymer that can be blended in the printing ink composition for reverse printing is mainly composed of a copolymer of vinyl chloride and an acrylic monomer, and the form of the copolymer is not particularly limited. For example, acrylic monomers may be incorporated into the main chain of polyvinyl chloride in blocks or randomly, or may be graft-copolymerized with side chains 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 is preferably a linear alkyl group.
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, hydroxyethyl acrylamide, 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 preferably has a weight average molecular weight of 10,000 to 70,000.
In addition, from the viewpoint of solubility in environmentally friendly solvents as the organic solvent and adhesiveness to substrates, the vinyl chloride-acrylic copolymer has a hydroxyl group of 50 to 200 mgKOH / g. preferably.

The printing ink composition for reverse printing comprises polyurethane resin and (vinyl chloride/vinyl acetate copolymer and/or vinyl chloride/acrylic copolymer), polyurethane resin/(vinyl chloride/vinyl acetate copolymer) and/or vinyl chloride-acrylic copolymer) = 95/5 to 45/55 (mass ratio), preferably 92/8 to 70/30.
The polyurethane resin/(vinyl chloride/vinyl acetate copolymer) may be in the range of 90/10 to 75/25, and the polyurethane resin/(vinyl chloride/acrylic copolymer) may be in the range of 95/5 to 85/. A range of 15 may be used.
By containing a polyurethane resin and a vinyl chloride/vinyl acetate copolymer and/or a vinyl chloride/acrylic copolymer in a ratio of 95/5 to 45/55, a printing ink composition for reverse printing is obtained. will have better printability and adhesion to film. 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) exceeds 95/5, (vinyl chloride/vinyl acetate copolymer and/or vinyl chloride/ acrylic copolymer) may decrease, and the adhesion to the film may become insufficient.
On the other hand, 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 chloride (Vinyl-Acrylic Copolymer) becomes large, and the printed matter formed using the printing ink composition becomes hard, and the adhesiveness to the above-mentioned film may become insufficient.

The total content of the polyurethane resin and the vinyl chloride/vinyl acetate copolymer and/or vinyl chloride/acrylic copolymer in the printing ink composition for reverse printing is preferably 5 to 30% by mass. is.
In addition, the printing ink composition for reverse printing can contain one or more selected from an adhesion improver and an antiblocking agent within a range that does not impair the intended performance of the present invention, preferably an adhesion improver. and an antiblocking agent are preferably used in combination.

(Adhesion improver)
Examples of the adhesion improver that can be blended in the printing ink composition for reverse printing include rosin and derivatives thereof, chlorinated polypropylene, dammar resin, etc. At least one or more, more preferably two, selected from rosin and derivatives thereof. It is desirable to contain the above.

(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 is aromatic and the other is a single double bond. It is the denaturation that becomes a molecule. It is generally less weather resistant than hydrogenated rosin, but more weather resistant than untreated rosin.
(3) Rosin-modified phenolic resin: A rosin-modified phenolic resin is sometimes used as the main binder. 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 its rosin derivative 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. In addition, the total amount of rosin and its derivatives used when blending them is preferably 0.1 to 3.0% by mass in solid content mass% of the printing ink composition for reverse printing.

(chlorinated polypropylene)
As the 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 adhesion. On the other hand, when the weight average molecular weight exceeds 200,000, the chlorinated polypropylene tends to have lower solubility in organic solvents. Further, the amount of chlorinated polypropylene to be used when blending is preferably 0.1 to 3.0% by mass in solid content mass% of the printing ink composition for reverse printing.

(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, it is possible to eliminate or reduce chlorine compared to using chlorinated polypropylene in the printing ink composition. Moreover, the amount of the dammar resin used when blending is preferably 3.0% by mass or less in solid content mass% of the printing ink composition for reverse printing.

(Anti-blocking agent)
Examples of the antiblocking agent include silica particles, polyethylene wax, fatty acid amide, cellulose acetate butyrate resin, cellulose acetate propionate resin, nitrocellulose, etc. One or more of silica particles, polyethylene wax, fatty acid amide, preferably It is preferable to contain two or more kinds, and depending on the type of pigment, it is preferable to further contain cellulose acetate butyrate resin, cellulose acetate propionate resin, and nitrocellulose.

<Silica particles>
Examples of silica particles include naturally occurring, synthetic, crystalline, non-crystalline, hydrophobic, and hydrophilic silica particles. Silica particles preferably have an average particle size of 1.0 to 5.0 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 is measured by the Coulter Counter method. can be obtained by). 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. A printing ink composition containing silica particles promotes wetting and spreading of the printing ink composition 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 preferably 0.0 to 3.0% by mass, more preferably 0.1 to 1.0% by mass in the printing ink composition for reverse printing.

(polyethylene wax)
As the polyethylene wax, it is preferable to use one having an average particle size in the range of 1.0 to 3.0 μm (the average particle size means 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 blocking property may be deteriorated, and if the particle size is larger than 3.0 μm, the trapping property may be deteriorated. Moreover, the content of the polyethylene wax in the printing ink composition for reverse printing is preferably in the range of 0.1 to 1.5% by mass. If the content is less than 0.1% by mass, the desired effect cannot be obtained, and if the content is more than 1.5% by mass, the gloss may decrease.

(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, NCRS-2 (Korea CNC Ltd.) and the like. The amount of nitrocellulose used is preferably in the range of 0.1 to 2.0% by mass in the printing ink composition for reverse printing, depending on the type of pigment.

(cellulose acetate propionate resin)
As the cellulose acetate propionate resin, 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 weight of acetylation, 42 to 46% by weight of propionylation, and 1.8 to 5% by weight of hydroxyl groups are commercially available. The cellulose acetate propionate resin is preferably used in a range of 0.1 to 3.0% by mass in the printing ink composition for reverse printing, depending on the type of pigment.

(cellulose acetate butyrate resin)
As the cellulose acetate butyrate resin, resins conventionally used in gravure printing ink compositions can be used.
Cellulose acetate butyrate resin is obtained by hydrolyzing after tri-esterifying cellulose 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% by mass of hydroxyl groups are commercially available. The amount of the cellulose acetate butyrate resin to be used is preferably in the range of 0.1 to 3.0% by mass in the printing ink composition for reverse printing, depending on the type of pigment.

(Fatty acid amide)
The fatty acid amide is not particularly limited as long as it has a residue obtained by removing an acid group from a fatty acid 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 preferably in the range of 0.01 to 1.0% by mass in the printing ink composition for reverse printing.

- Monoamide: Monoamide is represented by the following general formula (1).
General formula (1) R ₁ —CONH ₂
(In the formula, _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) R ₂ —CONH—R ₃
(Wherein, R ₂ and R ₃ 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) R ₄ —CONH—R ₅ —HNCO—R ₆
general formula (4) R ₇ —NHCO—R ₈ —CONH—R ₉
(Wherein, R ₄ , R ₆ , R ₇ and R ₉ represent a residue obtained by removing COOH from a fatty acid, which may be the same or different, and R ₅ and R ₈ are alkylene groups having 1 to 10 carbon atoms. or represents an arylene group.)
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) R ₁₀ —CONHCH ₂ OH
(Wherein, _R10 represents a residue obtained by removing COOH from a fatty acid.)
Specific examples of methylolamides include methylol palmitic acid amide, methylol stearic acid amide, methylol behenic acid amide, methylol hydroxystearic acid amide, methylol oleic acid amide, and methylol erucic acid amide.

- Esteramide: Esteramide is represented by the following general formula (6).
general formula (6) R ₁₁ —CONH—R ₁₂ —OCO—R ₁₃
(In the formula, R ₁₁ and R ₁₃ represent residues obtained by removing COOH from a fatty acid and may be the same or different, and R ₁₂ represents an alkylene group or arylene group having 1 to 10 carbon atoms.)
Specific examples of ester amides include stearylamide ethyl stearate and oleylamide ethyl stearate.
The melting point of the fatty acid amide is preferably 50-150°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.

(Organic solvent)
The printing ink composition for reverse printing that forms the printing layer is oil-based. Examples of organic solvents to be used include alcohol solvents such as methanol, ethanol, isopropanol, normal propanol, butanol, isobutanol, and tert-butanol, toluene, and xylene, in common with surface printing and shrink ink compositions. aromatic hydrocarbon solvents such as hexane, cyclohexane, methylcyclohexane, ethylcyclohexane and other aliphatic hydrocarbon solvents, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone and other ketone solvents, ethyl acetate, n-propyl acetate, Ester solvents such as isopropyl acetate, butyl acetate, isobutyl acetate, sec-butyl acetate, tert-butyl acetate, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol dimethyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene Glycol-based solvents such as glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, and esters thereof can be mentioned, and the esters are mainly acetates, such as ethylene glycol monomethyl ether acetate, Ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate and the like. These can be used alone or in combination of two or more.
From the aspect of environmental problems, mixed solvents of ester-based organic solvents, alcohol-based organic solvents and ketone-based organic solvents, or mixed solvents of ester-based organic solvents and alcohol-based organic solvents that are more environmentally friendly It is preferred to use
Furthermore, the printing ink composition for reverse printing may contain 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 wetting and spreading properties. 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.

The printing ink composition for reverse printing preferably contains water from the viewpoints of alleviating printing defects due to static electricity, preventing plate fogging, and improving cell reproducibility. The amount of water used is preferably 10% by mass or less, more preferably in the range of 0.1 to 5.0% by mass in the printing ink composition for reverse printing.

(other materials)
Various additives such as a pigment dispersant, an antistatic agent, and a plasticizer can be further added to the printing ink composition for reverse printing.
A known method can be used as a method for producing a printing ink composition using the constituent materials described above. Specifically, for example, a mixture of a binder resin, an organic solvent, and optionally a pigment dispersant is kneaded using a high-speed mixer, a ball mill, a sand mill, an attritor, or the like. It can be obtained by adding and mixing the rest of the materials such as agents.
Also, a metal tetraalkoxide and/or a hydroxy acid may or may not be contained.

(Method for producing printing ink composition for reverse printing)
As a method for producing a printing ink composition for reverse printing using these materials, first, a pigment, a binder resin, an organic solvent, and, if necessary, a pigment dispersant, a surfactant, etc. are stirred and mixed, and then A method of kneading using various kneading machines such as a bead mill, ball mill, sand mill, attritor, roll mill, pearl mill, etc., and then adding and mixing the fatty acid amide, the chelate cross-linking agent and the remaining ingredients is used.

(Printing method using printing ink composition for reverse printing, and laminate obtained thereby)
Next, a method for obtaining a laminated printed matter using the printing ink composition for reverse printing will be described.
The printing ink composition for reverse printing can also be used for applications other than lamination.
Methods for obtaining laminated prints include at least the following printing methods.
For example, as a resin substrate, the primer composition for detachment of the present invention is applied to a known resin film serving as a substrate for lamination. After that, the gravure printing ink composition for lamination is printed once or more by the gravure printing method in-line or off-line. Next, another gravure printing ink composition for lamination is printed by gravure printing on any part of the surface side of the printing ink layer for gravure lamination (after the final lamination, the lower layer side when viewed from the surface layer) formed by these printing methods. and dried with a dryer. The printing speed and drying temperature for the printing ink composition for lamination can be appropriately selected from known speeds and temperatures.
On the side of the layer of the gravure printing ink composition for lamination of the printed matter obtained by the above method, a resin film or the like is laminated by various methods to form a sealant layer, and a laminated printed matter for packaging bags or the like is obtained. can be done. As this laminating method, there is an extrusion lamination method in which a molten polymer is laminated after coating the surface of the printed matter with or without an anchor coating agent, an adhesive is applied to the surface of the printed matter, and then a film is formed. A dry lamination method for laminating polymers can be used.
Resins such as non-stretched polypropylene and aluminum-deposited CPP (non-stretched polypropylene) films can be used as the extrusion-laminated resin layer and film-like polymer. Particularly in the latter case, the aluminum-deposited CPP film itself, which is the sealant layer, can be detached in the detachment step with the detachment liquid described below.

In the extrusion lamination method, the surface of the printed matter including the layer of the printing ink composition is optionally coated with an anchor coating agent such as titanium, urethane, imine, or polybutadiene after or without coating. It is a method of laminating a molten polymer by a known extrusion laminating machine, and it is also possible to laminate other materials in a sandwich form using a molten resin as an intermediate layer. In this case, a polybutadiene-based compound-based anchor coating agent may or may not be used.
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, the effects of the present invention are enhanced when used with low-density polyethylene, in which carbonyl groups are likely to be generated by oxidation during melting.

In addition, the dry lamination method is a method of applying a urethane-based, isocyanate-based, or other adhesive to the surface of a layer formed by a gravure printing ink composition for lamination, and then laminating a resin film using a known dry laminating machine. . 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 films obtained by pre-processing such as coating and kneading of an anti-fogging agent, surface coating and kneading of a matting agent.
As the resin film, a film obtained by laminating a barrier layer coated with metal vapor deposition or a barrier resin on various plastic films for printing, or the like can be used.

＜＜Surface printing＞＞
The surface printing ink composition contains a binder resin and various additives in addition to the above pigments.
<Binder resin>
The binder resin contained in the surface printing ink composition is selected from the following resins, for example, a combination of a cellulose resin and a polyamide resin, a combination of a cellulose resin and a polyurethane resin, and a combination of a polyurethane resin and the vinyl chloride/vinyl acetate copolymer. , a combination of an acrylic resin and a polyurethane resin, a combination of a cellulose resin and an acrylic resin, a cellulose resin alone, or the vinyl chloride/vinyl acetate copolymer alone.

(Cellulose resin)
As the cellulose-based resin, cellulose-based resins conventionally used in gravure printing ink compositions can be used. Examples of such cellulose-based resins include nitrocellulose (nitro group-substituted), lower acyl group-substituted products such as cellulose acetate, cellulose acetate propionate, cellulose acetate butyrate (CAB), and lower alkyl groups such as methylcellulose and ethylcellulose. Substituents can be mentioned. The mass-average molecular weight and the degree of substitution for hydroxyl groups of these cellulose-based resins are within the ranges used in ordinary printing ink compositions and paints, and can be used in the present invention without any problem.

The degree of substitution of hydroxyl groups is preferably about 1.3 to 2.7. In terms of heat resistance, it is advantageous to use a nitro group-substituted compound, and in terms of adhesion, a lower acyl group-substituted compound and a lower alkyl group-substituted compound are advantageous. It is preferred to use
When a cellulose-based resin is contained, it is preferable that the content ratio of the polyurethane resin and the cellulose-based resin is in the range of 5:95 to 95:5 in terms of mass of the polyurethane resin: cellulose-based resin. The content ratio of the polyamide resin and the cellulose resin is preferably polyamide resin: cellulose resin=95:5 to 70:30. It is preferable that the content ratio of the acrylic resin and the cellulose resin is acrylic resin:cellulose resin=95:5 to 30:70.

(polyurethane resin)
As the polyurethane resin, a polyurethane resin obtained by reacting a polyisocyanate compound, a diol compound, and, if necessary, a chain extender, a reaction terminator, etc., can be used.
Examples of the polyisocyanate compound include aliphatic diisocyanate compounds such as hexamethylene diisocyanate and 2,2,4-trimethylhexamethylene diisocyanate; Cyclic diisocyanate compounds, xylylene diisocyanate, araliphatic diisocyanate compounds such as α,α,α',α'-tetramethylxylylene diisocyanate, and aromatic diisocyanate compounds such as toluylene diisocyanate and diphenylmethane diisocyanate can be used.
Furthermore, a known binder resin for gravure printing can be used together with such a polyurethane resin.

Next, a suitable diol compound is a high molecular weight diol compound having a number average molecular weight of more than 500 and not more than 3,000, more preferably from 500 to 2,000. It may consist of a diol compound, or may use a plurality of diol compounds in combination. When the number average molecular weight of the diol compound is 500 or less, the adhesion tends to decrease, while when the number average molecular weight exceeds 3,000, the oil resistance tends to decrease.
Specific examples of diol compounds include alkylene glycol compounds having a number average molecular weight of 100 or more, polyalkylene glycol compounds such as polyethylene glycol and polypropylene glycol, and diol compounds such as low molecular weight alkylene glycol and bisphenol, and ethylene oxide, propylene oxide and the like. A polyether diol compound obtained by polyaddition of oxyalkylene, tetrahydrofuran, or the like can be mentioned.
In addition, linear glycols such as ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, 1,2-propanediol, neopentyl glycol, 3-methyl-1, branched glycols such as 5-pentanediol, 2,4-diethyl-1,5-pentanediol and ethylbutylpropanediol; low-molecular-weight diol compounds such as ether-based diols such as diethylene glycol and triethylene glycol; Polyester diol compounds obtained by polycondensation of dicarboxylic acid compounds such as saturated and unsaturated aliphatic dicarboxylic acids such as adipic acid, azelaic acid, sebacic acid and maleic acid, and aromatic dicarboxylic acids such as phthalic acid, lactones, etc. A polyester diol compound obtained by a ring-opening reaction of a cyclic ester compound can be mentioned.

Furthermore, linear or side chain polycarbonate compounds, polybutadiene glycol compounds, and the like can also be used in combination.
In addition, in consideration of the environment, it does not contain aromatic hydrocarbon organic solvents (toluene, etc.), and in order to obtain good printability in systems with a high content of highly polar organic solvents such as alcohols and esters. preferably uses a polyether diol compound as the polyol compound.
Moreover, when using another solvent, it may be preferable to use a polyester diol compound.

Furthermore, it is also possible to use a polyurethane resin obtained by using a chain extender or a reaction terminator. Examples of chain extenders include aliphatic diamines such as ethylenediamine, propylenediamine, tetramethylenediamine, and hexamethylenediamine. , isophoronediamine, 4,4′-dicyclohexylmethanediamine and other alicyclic diamines, diethylenetriamine, triethylenetetratriamine and other polyamines, toluylenediamine and other aromatic diamines, xylenediamine and other araliphatic diamines , N-(2-hydroxyethyl)ethylenediamine, N-(2-hydroxyethyl)propylenediamine, N,N'-di(2-hydroxyethyl)diamines having a hydroxyl group such as ethylenediamine, ethylene glycol, propylene glycol, 1 , 4-butanediol, neopentyl glycol, diethylene glycol, triethylene glycol, and other diol compounds.

Examples of the reaction terminator include monoalcohols such as methanol and ethanol, alkylamines such as n-propylamine, n-butylamine and di-n-butylamine, alkanolamines such as monoethanolamine and diethanolamine, ethylenediamine and propylenediamine. , tetramethylenediamine, hexamethylenediamine and other aliphatic diamines, isophoronediamine, 1,4-butanediamine, 4,4'-dicyclohexylmethanediamine and other alicyclic diamines, diethylenetriamine, triethylenetetratriamine and other polyamines , aromatic diamines such as toluylenediamine, araliphatic diamines such as xylenediamine, N-(2-hydroxyethyl)ethylenediamine, N-(2-hydroxyethyl)propylenediamine, N,N'-di( 2-Hydroxyethyl)ethylenediamine and other hydroxyl group-containing diamines, and aminoethylethanolamine.

In order to obtain the polyurethane resin used in the present invention using the synthetic components described above, first, the molar equivalent ratio of the NCO of the polyisocyanate compound to the OH of the diol compound (molar equivalent of NCO of the polyisocyanate compound/diol compound OH molar equivalent) = 0.5 or more and 3.0 or less, preferably 1.2 or more and 1.5 or less, and then reacting with a chain extender and reaction terminator as necessary can be obtained by
If the molar equivalent of NCO of the polyisocyanate compound/the molar equivalent of OH of the diol compound is less than 0.5, the heat resistance and oil resistance tend to decrease, while the NCO molar equivalent of the polyisocyanate compound/ If the molar equivalent of OH in the diol compound exceeds 3, the stretchability tends to decrease.

(biomass polyurethane)
Some or all of the diol compounds constituting the polyurethane may be diol compounds obtained using biomass components derived from plant components in consideration of the environment.
As such a diol compound, a polyester polyol compound is preferable, and this polyester polyol compound is a biopolyester polyol obtained by reacting a short-chain diol compound having 2 to 4 carbon atoms with a carboxylic acid compound. At least one of the short-chain diol compound and the carboxylic acid compound in the biopolyol component is more preferably plant-derived, and both are more preferably plant-derived.
The plant-derived short-chain diol compound having 2 to 4 carbon atoms is not particularly limited. By way of example, the short-chain diol compound may be 1,3-propanediol, 1,4-butanediol, ethylene glycol, etc. obtained from plant materials 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. The 1,3-propanediol component produced by a bio-method such as the fermentation method described above is superior in terms of safety compared to the 1,3-propanediol component produced by the EO production method. By-products can be obtained, and the manufacturing cost can be kept low. 1,4-Butanediol can be produced by producing and fermenting glycol from plant resources to obtain succinic acid, which is then hydrogenated. Ethylene glycol can also be produced from bioethanol obtained by conventional methods via ethylene.

The plant-derived carboxylic acid compound is not particularly limited. Examples of carboxylic acid compounds include sebacic acid, succinic acid, lactic acid, glutaric acid, dimer acid, and the like. These may be used in combination. Among these, the carboxylic acid compound preferably contains at least one selected from the group consisting of sebacic acid, succinic acid and dimer acid. Further, 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 biopolyester polyol compound is produced as a 100% plant-derived biopolyol by appropriately condensing a plant-derived short-chain diol compound and a plant-derived carboxylic acid. Specifically, plant-derived sebacic acid and plant-derived 1,3-propanediol are directly subjected to dehydration condensation to obtain polytrimethylene sebacate polyol. In addition, polybutylene succinate polyol can be obtained by direct dehydration condensation of plant-derived succinic acid and plant-derived 1,4-butanediol.
One or more of each of these biopolyester polyol compounds may be used.
The urethane prepolymer obtained from these plant-derived components may be contained in an amount of 10% by mass or more, or 40% by mass or more in terms of solid content in the total urethane prepolymer.
Even when a plant-derived component is used in this way, the same chain extender and reaction terminator as described above can be used.

(polyamide resin)
As the polyamide resin, an acid component that may contain mainly polymerized fatty acids, further aliphatic, alicyclic and aromatic dicarboxylic acids and aliphatic monocarboxylic acids, and mainly aliphatic, alicyclic and aromatic Aliphatic and aromatic polyamines, alone or in mixtures, as well as reacted with an amine component which may contain a portion of primary and secondary monoamines.
Polymerized fatty acids are generally obtained by polymerization of unsaturated fatty acids having 16 to 22 carbon atoms or esters thereof, and include monobasic fatty acids, dimerized polymerized fatty acids, trimerized polymerized fatty acids, and the like. Examples of aliphatic dicarboxylic acids include succinic acid, adipic acid, azelaic acid and maleic acid. Examples of alicyclic dicarboxylic acids include cyclohexanedicarboxylic acid. Examples of aromatic dicarboxylic acids include isophthalic acid and terephthalic acid. be able to. Further, aliphatic monocarboxylic acids include acetic acid, stearic acid, oleic acid, linoleic acid and the like.

On the other hand, aliphatic polyamines in the amine component include aliphatic diamines such as ethylenediamine, propylenediamine, hexamethylenediamine and methylaminopropylamine, and aliphatic polyamines such as diethylenetriamine and triethylenetetramine. Examples of group polyamines include cyclohexylene diamine and isophorone diamine. Examples of araliphatic polyamines include xylylenediamine, and examples of aromatic polyamines include phenylenediamine and diaminodiphenylmethane. Furthermore, primary and secondary monoamines include butylamine, octylamine, diethylamine, monoethanolamine, monopropanolamine, diethanolamine, and dipropanolamine.
From the viewpoint of oil resistance, heat resistance, and anti-blocking property of the printing ink composition, it is preferable to use a polyamide resin having an alkanolamine as a primary or secondary monoamine component and a hydroxyl group in the molecule among the polyamide resins.
As a method for synthesizing a polyamide resin from the above acid component and amine component, preferably the ratio of carboxyl group / amino group of the reaction component is 0.9 / 1.0 to 1.0 / 0.9, more preferably 1 0/1.0, preferably at a reaction temperature of 160 to 280° C., more preferably 180 to 230° C., and in the final stage, the reaction is performed under a reduced pressure of about 100 torr.

(Thermoplastic polyamide resin using vegetable oil fatty acid as a reaction raw material)
Among the above polyamide resins, thermoplastic polyamide resins using vegetable oil fatty acid as a reaction raw material are not particularly limited. For example, thermoplastic polyamide resins using vegetable oil fatty acids as reaction raw materials include polyamide resins using vegetable oil fatty acids such as tall oil, rice bran oil, palm oil, coconut oil and soybean oil as reaction raw materials. By using a vegetable oil fatty acid as a reaction raw material, it is possible to reduce the burden on the environment when using such a thermoplastic polyamide resin.
A thermoplastic polyamide resin using a vegetable oil fatty acid as a reaction raw material is a polycondensate of a polycarboxylic acid containing a vegetable oil fatty acid and a polyamine. Polyamine is not particularly limited. Examples of polyamines include aliphatic polyamines, alicyclic polyamines, aromatic polyamines, and the like. Aliphatic polyamines include ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexane, piperazine, N-aminoethylpiperazine, and the like. Alicyclic polyamines include isophoronediamine, bisaminomethylcyclohexane, and the like. Aromatic polyamines include meta-xylenediamine and the like. A thermoplastic polyamide resin may be used in combination.
The number average molecular weight (Mn) of the thermoplastic polyamide resin is not particularly limited. For example, Mn of the thermoplastic polyamide resin is preferably 1,000 or more. Also, Mn is preferably 30,000 or less. If the Mn of the thermoplastic polyamide resin is less than 1,000, the printing ink composition tends to have reduced blocking resistance and heat resistance. On the other hand, when the Mn exceeds 30,000, the printing ink composition tends to have reduced resistance to rubbing.
The acid value and amine value of the thermoplastic polyamide resin are not particularly limited. For example, the thermoplastic polyamide resin preferably has an acid value of 10.0 mgKOH/g or less and an amine value of 5.0 mgKOH/g or less.
More preferably, the thermoplastic polyamide resin has a softening point of 90 to 150°C.
The content of the thermoplastic polyamide resin is not particularly limited. For example, the content of the thermoplastic polyamide resin is preferably 20.0% by mass or more and preferably 70.0% by mass or less based on the total solid content in the printing ink composition.

(acrylic resin)
The acrylic resin can be produced by a conventionally known method, and the production method is not particularly limited. The acrylic resin is obtained by polymerizing a monomer having a carbon-carbon unsaturated double bond in one molecule in the presence of a polymerization initiator in a solvent.
Here, the monomer having a carbon-carbon unsaturated double bond in one molecule includes (i) (meth)acrylic acid derivative, (ii) aromatic vinyl, (iii) olefinic hydrocarbon, (iv ) vinyl esters, (v) vinyl halides, and (vi) vinyl ethers.

(i) As (meth)acrylic acid derivatives, (meth)acrylonitrile, (meth)acrylates, and alkyls such as methyl (meth)acrylate, butyl (meth)acrylate, ethylhexyl (meth)acrylate and stearyl (meth)acrylate (Meth)acrylate, benzyl (meth)acrylate and the like.
(ii) Examples of aromatic vinyl include styrenes such as styrene, methylstyrene, ethylstyrene, chlorostyrene, monofluoromethylstyrene, difluoromethylstyrene, and trifluoromethylstyrene in which some hydrogen atoms are substituted with fluorine.
(iii) Olefinic hydrocarbons include ethylene, propylene, butadiene, isobutylene, isoprene, 1,4-pentadiene and the like.
(iv) Vinyl esters include vinyl acetate and the like.
(v) Vinyl halides include vinyl chloride and vinylidene chloride.
(vi) Vinyl ether includes vinyl methyl ether and the like.
As the monomer having a carbon-carbon unsaturated double bond in one molecule, a monomer having a crosslinkable functional group can be used. Examples of functional group-containing monomers include (vii) hydroxyl group-containing monomers, (viii) isocyano group-containing monomers, and (ix) epoxy group-containing monomers.

(vii) monomers having a hydroxyl group include 2-hydroxyethyl (meth)acrylate, 1-hydroxypropyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6 -Hydroxyalkyl (meth)acrylates such as hydroxyhexyl (meth)acrylate and 8-hydroxyoctyl (meth)acrylate, polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, polytetramethylene glycol mono (meth) acrylate and glycol mono(meth)acrylate, hydroxystyrene, and the like.
(viii) Monomers having an isocyano group include (meth)acryloyloxyethyl isocyanate, (meth)acryloyloxypropyl isocyanate and the like, as well as 2-hydroxyethyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate and the like. with polyisocyanates such as toluene diisocyanate and isophorone diisocyanate.
(ix) Monomers having an epoxy group include glycidyl methacrylate, glycidyl cinnamate, glycidyl allyl ether, glycidyl vinyl ether, vinylcyclohexane monoepoxide, 1,3-butadiene monoepoxide and the like.
If necessary, one or a mixture of two or more of these monomers having a carbon-carbon unsaturated double bond in one molecule can be used, and the acid value is 100 to 100. 200 mg KOH/g is preferred. If it is out of this range, phase separation, viscosity increase, and gelation of the printing ink occur, resulting in storage stability problems.
Polymerization initiators used in synthesizing acrylic resins include ordinary peroxides or azo compounds such as benzoyl peroxide, azoisobutylvalenonitrile, azobisisobutyronitrile, di-t-butyl peroxide, t-Butyl perbenzoate, t-butyl peroctoate, cumene hydroperoxide and the like are used, and the polymerization temperature is 50 to 140°C, preferably 70 to 140°C.
The weight average molecular weight of the resulting polymer is preferably 5,000 to 100,000.
Non-aromatic solvents used in the above production method include ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone, ethers such as tetrahydrofuran, dioxane, ethylene glycol dimethyl ether and diethylene glycol dimethyl ether, ethyl acetate and butyl acetate. It is possible to use esters of The solvent may be a mixture of two or more.

(Rosin resin and its derivative)
The rosin-based resin can be arbitrarily selected from rosin and its derivatives that can be used in the above reverse printing.
Among them, the rosin-based resin preferably has an acid value of 10 to 350 mgKOH/g, more preferably 200 to 350 mgKOH/g, still more preferably 250 to 350 mgKOH/g. Among rosin-based resins, rosin-maleic acid resin and/or polymerized rosin are preferred.
The content of the rosin-based resin in the printing ink composition is preferably 0.1-5.0% by mass.

(other resin)
Other resins optionally used in surface printing ink compositions include vinyl chloride/vinyl acetate resins, dimer acid resins, rosin resins, maleic acid resins, petroleum resins, terpene resins, ketone resins, dammar Resin, copal resin, chlorinated polypropylene, oxidized polypropylene and the like. The use of these hard resins can be expected to improve adhesiveness to resin films that have not undergone surface treatment. The appropriate content of the hard resin in the gravure printing ink composition is less than 5.0% by mass.
However, when vinyl chloride/vinyl acetate resin is used, the solid content ratio of polyurethane resin and vinyl chloride/vinyl acetate resin must be polyurethane resin/vinyl chloride/vinyl acetate resin = 100/0 to 70/30. Preferably, 100/0 to 90/10 is more preferable.

(Chelate cross-linking agent)
As the chelate cross-linking agent, metal chelate cross-linking agents such as titanium chelate and zirconium chelate can be used.
Titanium chelates include titanium such as tetraisopropyl titanate, tetra-normal-butyl titanate, butyl titanate dimer, tetra(2-ethylhexyl) titanate, a reaction product of tetraisopropoxytitanium and 2-ethylhexanoic acid, tetramethyl titanate, tetrastearyl titanate, etc. Titanium chelates such as alkoxides, triethanolamine titanate, titanium acetylacetate, titanium ethylacetoacetate, titanium lactate, octylene glycol titanate, titanium tetraacetylacetonate, titanium n-butyl phosphate, and propanedioxytitanium bis(ethyl acetylacetate) can be mentioned.
Examples of zirconium chelates include zirconium propionate and zirconium acetylacetate.
From an environmental point of view, among the chelate cross-linking agents, a chelate cross-linking agent that does not have acetylacetonate as a ligand is preferable so as not to generate acetylacetone after the cross-linking reaction.

(Fatty acid amide)
Fatty acid amides are used from the viewpoint of blocking resistance. Examples of fatty acid amides include saturated fatty acid amides, unsaturated fatty acid amides, and modified fatty acid amides. Modified fatty acid amides are used to improve the blocking resistance of soft polyvinyl chloride sheets used for tablecloths. is particularly preferred. The content of the fatty acid amide in the printing ink composition is preferably 0.1 to 3.0% by mass, more preferably 0.5 to 2.0% by mass.
If the content is less than 0.1% by mass, blocking resistance may deteriorate, and if it exceeds 3.0% by mass, oil resistance may deteriorate.

(organic solvent)
As the solvent component used in the front printing ink composition for forming the front printing layer, a solvent that can be used in the above printing ink composition for back printing can be employed. Furthermore, as the organic solvent, it is preferable to use an organic solvent that does not contain an aromatic hydrocarbon organic solvent in consideration of the environment. Organic solvents that do not contain aromatic hydrocarbon-based organic solvents mainly 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; Ester organic solvents such as methyl acetate, ethyl acetate, propyl acetate and butyl acetate, aliphatic hydrocarbon organic solvents such as n-hexane, n-heptane and n-octane, and cyclohexane, methylcyclohexane, ethylcyclohexane and cyclohexane. Alicyclic hydrocarbon-based organic solvents such as heptane and cyclooctane can be mentioned, and they can be mixed and used in consideration of the solubility and drying properties of the binder resin. However, in consideration of environmental aspects, it is preferable to suppress ketone-based organic solvents as much as possible among the above organic solvents.
The amount of these organic solvents used is preferably 15.0% by mass or more in the printing ink composition of the present invention in consideration of printability. From the viewpoint of printability, the printing ink composition preferably contains 5.0% by mass or more of propyl acetate, and more preferably 10.0% by mass or more. In order to improve printability, it is preferable to add 0.1 to 10% by mass of water in the organic solvent.

<Pigment>
The printing ink composition for surface printing can contain the above pigments.

(other materials)
A wax can be added to the printing ink composition for surface printing for the purpose of improving abrasion resistance within a range in which the performance is not deteriorated.
As the wax, various known waxes such as polyolefin wax and paraffin wax can be used.
Furthermore, various printing ink additives such as pigment dispersants, leveling agents, surfactants and plasticizers can be optionally added.

(Method for producing printing ink composition for surface printing)
As a method for producing the printing ink composition for surface printing using these materials, the same method as the method for producing the printing ink composition for reverse printing can be employed.

(Printing method using printing ink composition for surface printing, and laminate obtained thereby)
Next, a method for obtaining a surface printed matter using the printing ink composition for surface printing will be described.
A detachable primer layer is formed from the detachable primer composition of the present invention on a resin base material for surface printing. It is then printed in-line or off-line with a surface printing ink composition utilizing conventional surface printing methods. The printing speed and drying temperature at this time can be appropriately selected from known speeds and temperatures.
As the resin base material, the resin base material for reverse printing can be used.

<<Printing for shrink wrap>>
The ink composition for shrink packaging contains the above pigment, binder resin and various additives.

<Binder resin>
Binder resins that can be used include, for example, printing ink compositions for shrink packaging containing carboxyl group-containing acrylic resins, cellulose resins, rosin resins, and derivatives thereof that satisfy the following condition 1 or 2.
Condition 1:
The ratio of the solid mass of the carboxyl group-containing acrylic resin to the solid mass of the cellulose resin is solid mass of the carboxyl group-containing acrylic resin/solid mass of the cellulose resin = 80/20 to 60/40.
Condition 2:
The rosin resin and its derivative have an acid value of 150 mgKOH/g or less, and are contained in a range of 1 to 6% by mass in the solid content of the resin.
The printing ink composition for shrink packaging of the present invention will be specifically described below.
The biomass degree of the printing ink composition for shrink packaging of the present invention is preferably 10 or more.
The biomass degree is calculated by the following formula.
Degree of biomass = amount of biomass component/amount of total solids including pigment in printing ink composition for shrink packaging x 100
Amount of biomass component: total amount of biomass-derived weight in resin solid content and additive solid content (resin weight x biomass weight ratio + additive weight x biomass weight ratio)

(acid value)
The acid value in the specification of the present application is the theoretical neutralization amount of potassium hydroxide (KOH) with respect to the amount of each monomer theoretically required to obtain 1 g of a carboxyl group-containing acrylic resin, rosin resin, etc. The amount in mg of the sum of the neutralized amounts is taken as the acid value of the polymer.

<Mass average molecular weight>
The weight average molecular weight of resins herein can be measured by gel permeation chromatography (GPC) method. As an example, using Water 2690 (Waters) as a GPC apparatus, PLgel, 5 μ, MIXED-D (Polymer Laboratories) as a column, tetrahydrofuran as a developing solvent, column temperature 25 ° C., flow rate 1 ml / min, RI detector , a sample injection concentration of 10 mg/ml, an injection amount of 100 microliters, chromatography is performed, and the polystyrene-equivalent mass-average molecular weight is obtained.

(Carboxyl group-containing acrylic resin)
Carboxyl group-containing acrylic resins include copolymers of radically polymerizable carboxylic acid monomers and radically polymerizable acrylic monomers, and radically polymerizable carboxylic acid monomers other than radically polymerizable acrylic monomers. and a copolymer that also contains a radically polymerizable monomer.
Examples of the radically polymerizable carboxylic acid monomers include acrylic acid, methacrylic acid, crotonic acid; monoesters and monoamides of dicarboxylic acids such as maleic acid, fumaric acid, citraconic acid and itaconic acid; maleic anhydride, citraconic anhydride, itaconic anhydride; esters of vinyl alcohol and saturated carboxylic acids having 2 to 18 carbon atoms such as acetic acid, propionic acid, lauric acid and stearic acid;
Radically polymerizable acrylic monomers include alcohol esters such as methyl, ethyl, propyl, butyl and pentyl alcohol of acrylic acid and methacrylic acid, and diesters such as ethylene glycol and propylene glycol. Examples of the radically polymerizable monomer (c) other than the radically polymerizable carboxylic acid monomer and the radically polymerizable acrylic monomer include styrene and α-methylstyrene.
Among these carboxyl group-containing acrylic resins, copolymers in which the carboxyl group is derived from a methacrylic acid monomer are preferred, and methacrylic acid (MAA), methyl methacrylate (MMA) and butyl methacrylate (BMA) are preferred. ) is preferred.

The acid value of the carboxyl group-containing acrylic resin obtained by copolymerizing the above monomers is preferably 2 to 20 mgKOH/g. Moreover, 3 mgKOH/g or more is more preferable, 15 mgKOH/g or less is more preferable, and 10 mgKOH/g or less is still more preferable. If it is less than 2 mgKOH/g, problems with compatibility with cellulose resin tend to occur, and if it is more than 20 mgKOH/g, content resistance suitability (surfactant resistance, alkali resistance) tends to be inferior.
Further, the weight average molecular weight of the carboxyl group-containing acrylic resin is preferably 30,000 to 100,000. Among them, 35,000 or more is more preferable, and 40,000 or more is even more preferable. Moreover, 90,000 or less is more preferable, and 80,000 or less is still more preferable.
If the weight-average molecular weight is less than 30,000, blocking properties, adhesiveness, etc. tend to decrease, while if it exceeds 100,000, solubility and solubility with cellulose resin tend to decrease.
The content of the carboxyl group-containing acrylic resin in the solid content of the printing ink composition for shrink packaging of the present invention is preferably 10.0% by mass or more, more preferably 13.0% by mass or more, and 14.0% by mass. The above is more preferable. Moreover, 40.0 mass % or less is preferable, 35.0 mass % or less is more preferable, and 30.0 mass % or less is still more preferable.

(cellulose resin)
As the cellulose resin, cellulose acetate propionate resin, cellulose acetate butyrate resin, nitrocellulose resin, and the like, which have been conventionally used in gravure ink compositions, can be used. Cellulose acetate propionate resin and cellulose acetate butyrate resin are preferable from the viewpoint of improving surfactant resistance, alkali resistance, and the like.
The content of the cellulose resin in the printing ink composition for shrink packaging of the present invention satisfies the following.
The ratio of the solid mass of the carboxyl group-containing acrylic resin to the solid mass of the cellulose resin in the printing ink composition for shrink packaging is: solid mass of carboxyl group-containing acrylic resin/solid mass of cellulose resin=80/ 20 to 60/40. And 75/25 to 65/35 is preferable. When the solid content mass ratio of the cellulose resin is more than 40, content resistance suitability (surfactant resistance, alkali resistance) tends to decrease, while when it is less than 20, blocking property etc. tends to decrease. .
The total content of each cellulose resin in the solid content of the printing ink composition for shrink packaging of the present invention is preferably 3.0% by mass or more, more preferably 5.0% by mass or more, and 7.0% by mass. % or more is more preferable. Moreover, 20.0 mass % or less is preferable, 15.0 mass % or less is more preferable, and 11.0 mass % or less is still more preferable.

(cellulose acetate propionate resin)
As the cellulose acetate propionate resin, known 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, the cellulose acetate propionate resin has an acetyl group content of 0.6 to 2.5% by weight, a propionate group content of 42.0 to 46.0% by weight, and a hydroxyl group content of 1.8 to 5.5% by weight. Resins with 0% by weight are commercially available.
Among these, it is preferable to use a low-molecular-weight resin in order to improve the degree of biomass.
The content of the cellulose acetate propionate resin in the solid content of the printing ink composition for shrink packaging of the present invention is preferably 3.0% by mass or more, more preferably 5.0% by mass or more, and 7.0% by mass. % or more is more preferable. Moreover, 20.0 mass % or less is preferable, 15.0 mass % or less is more preferable, and 11.0 mass % or less is still more preferable.

(cellulose acetate butyrate resin)
As the cellulose acetate propionate resin, resins conventionally used in gravure printing ink compositions can be used. Cellulose acetate butyrate resin is obtained by hydrolyzing after tri-esterifying cellulose with acetic acid and butyric acid. In general, resins containing 2 to 30% by weight of acetylation, 17 to 53% by weight of butyrylation, and 1 to 5% of hydroxyl groups are commercially available. Among these, it is preferable to use a low-molecular-weight resin in order to improve the degree of biomass.
The content of the cellulose acetate butyrate resin in the solid content of the printing ink composition for shrink packaging of the present invention is preferably 3.0% by mass or more, more preferably 5.0% by mass or more, and 7.0% by mass. The above is more preferable. Also, it is preferably 20.0% by mass or less, more preferably 15.0% by mass or less, and even more preferably 11.0% by mass or less.

(nitrocellulose resin)
As the nitrocellulose resin, nitrocellulose resins conventionally used in gravure printing ink compositions can be used. The nitrocellulose resin is obtained as a nitrate ester 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 resin used in the present invention, one having a nitrogen content of 10 to 13% and an average degree of polymerization of 35 to 90 is preferably used. Specific examples include SS1/2, SS1/4, SS1/8, TR1/16, NCRS-2 (Korea CNC Ltd.) and the like.
The content of the nitrocellulose resin in the solid content of the printing ink composition for shrink packaging of the present invention is preferably 3.0% by mass or more, more preferably 5.0% by mass or more, and 7.0% by mass or more. More preferred. Moreover, 20.0 mass % or less is preferable, 15.0 mass % or less is more preferable, and 11.0 mass % or less is still more preferable.

(Rosin resin and its derivative)
The rosin-based resin and its derivative can be arbitrarily selected from the rosin and its derivative that can be used in the back printing.
The rosin resin and its derivative preferably have an acid value of 150 mgKOH/g or less. If it exceeds 150 mgKOH/g, the stability and resistance to content (alkali resistance and surfactant resistance) of the ink composition may deteriorate. From the viewpoint of further excellent content suitability, it is more preferably 100 mgKOH/g or less, further preferably 50 mgKOH/g or less, still more preferably 30 mgKOH/g or less, extremely preferably 20 mgKOH/g or less, and most preferably 10 mgKOH/g or less.
The content of the rosin resin and its derivative in the solid content of the printing ink composition for shrink packaging of the present invention is preferably 3.0 to 20.0% by mass. And 5.0 mass % or more is more preferable, and 7.0 mass % or more is still more preferable. Moreover, 15.0 mass % or less is more preferable, and 10.0 mass % or less is still more preferable.

(Other resins)
In the printing ink composition for shrink packaging of the present invention, as a resin component other than the carboxyl group-containing acrylic resin, cellulose resin, rosin resin and derivatives thereof, within the range not impairing the effects of the present invention, Other resins may be used together.
Other resins include polyurethane urea resin, polyurethane resin, vinyl chloride/vinyl acetate copolymer resin, polyamide resin, acrylic resin, ethylene/vinyl acetate copolymer resin, chlorinated olefin resin, alkyd resin, vinyl acetate resin, Examples include ketone resins, polybutyral resins, cyclized rubber resins, chlorinated rubber resins, petroleum resins, olefin resins, polyester resins, polylactic acid resins, and the like.
An acrylic resin having a phosphoric acid group may or may not be included.

<Pigment>
The printing ink composition for shrink packaging can contain the pigments described above.

(Plasticizer)
As a plasticizer, dioctyl sebacate, fatty acid triglyceride, ethyltoluenesulfonic acid amide, acetyl tributyl citrate, stearic acid 2-ethylhexyl ester, palmitic acid 2-ethylhexyl ester, etc., and epoxidized vegetable oil, which have been conventionally used in gravure printing inks. can be used. Among these, epoxidized vegetable oils such as epoxidized soybean oil and epoxidized linseed oil are preferred from the viewpoint of content resistance suitability (surfactant resistance, alkali resistance) and biomass content.
The content of the plasticizer is not particularly limited. For example, the content of the plasticizer in the printing ink composition for shrink packaging is preferably 0.05% by mass or more, more preferably 0.5% by mass or more, and preferably 5.0% by mass or less. , 3.0% by mass or less. When the content of the plasticizer is within the above range, the obtained print ink composition for shrink packaging is improved in contents resistance suitability (surfactant resistance, alkali resistance).

(Amide compound)
Furthermore, the printing ink composition for shrink packaging includes an amide compound from the viewpoint of further improving scratch resistance, adhesion to substrates, scratch resistance, and suitability for content resistance (surfactant resistance and alkali resistance). is preferably contained. Examples of the amide compound include palmitic acid amide, stearic acid amide, ethylenebisoleic acid amide, hexamethylenebisoleic acid amide, and the like, and these may be used alone or in combination of two or more. good too. When an amide compound is added, it is preferably contained in the printing ink composition for shrink packaging in an amount of 0.1 to 5.0% by mass. Among them, in order to achieve both scratch resistance, adhesion to substrates, scratch resistance, surfactant resistance and alkali resistance, it is preferable to contain 0.1 to 4.0% by mass, and 0.3 to 2 It is preferably contained at 0.5% by mass.

(Solvent component)
As the solvent component used in the printing ink composition for shrink packaging that forms the printing layer in the present invention, a solvent that can be used in the ink composition for reverse printing can be employed.
Among these solvent components, it is preferable to use an alcohol-based solvent and/or an ester-based solvent from an environmental point of view, and more preferably an alcohol-based solvent and/or an ester-based solvent having 1 to 4 carbon atoms. Furthermore, it is preferable that the weight ratio of alcohol-based solvent and ester-based solvent having 1 to 4 carbon atoms is alcohol-based/ester-based solvent = 60/40 to 80/20, 63/37 to 75/25. It is preferable to use so as to be If the ester-based solvent is more than 40, there is a possibility of attacking the shrinkable OPS (shrinkable untreated polystyrene film). Also, if the ester solvent is less than 20%, the solubility of the resin component tends to decrease.

(Other ingredients)
In addition, the printing ink composition for shrink packaging of the present invention may optionally contain a friction-resistant agent, an antiblocking agent, a pigment dispersant, an antistatic agent, a lubricant, a cross-linking agent, an antifoaming agent, and a drying control agent. agents, other plasticizers, tackifiers, adhesion improvers, leveling agents, antioxidants and the like can be added. Among them, biomass-derived additives are more desirable.
Examples of lubricants include polyethylene (PE) wax, polypropylene wax, PTFE wax, paraffin wax, microcrystalline wax, Fischer-Tropsch wax, montan wax, carnauba wax, shellac wax, amide wax, organic polymers, beeswax, and mixed waxes thereof. and the like are preferable, and among them, polyethylene wax and polypropylene wax are more preferable.

(Method for producing shrink printing ink composition)
As a method for producing the printing ink composition for shrink using these materials, the same method as the above method for producing the printing ink composition for reverse printing can be employed.

(Printing method using printing ink composition for shrink, and laminate obtained thereby)
Next, a method for obtaining a shrink printed matter using the printing ink composition for shrink will be described.
A detachable primer composition is applied to a resin base material for shrink printing to form a detachable primer layer. Then, in-line or off-line, shrink printing is performed with the shrink printing ink composition using conventional printing methods. The printing speed and drying temperature at this time can be appropriately selected from known speeds and temperatures.
As the resin base material, the one for shrink printing can be employed.

<<Printing on the paper substrate side of laminated paper>>
As a printing ink composition used for printing on the paper substrate side of laminated paper, for example, an ink composition for water-based flexographic printing can be used. The water-based flexographic printing ink composition contains the pigment described above, the binder resin described below, and, if necessary, the additive described below.

<Binder resin>
Binders that can be used include resins obtained by polymerizing monomers having unsaturated double bonds that are used in ordinary water-based flexographic printing ink compositions, resins obtained by reaction between functional groups, and the like. It can be used without any restrictions. Specifically, water-soluble acrylic resins, water-soluble styrene-acrylic resins, water-soluble styrene-maleic acid resins, water-soluble Preferable examples include various binder resins such as styrene-acrylic-maleic acid resins, water-soluble polyurethane resins, and water-soluble polyester resins. The content of the binder resin is preferably 1 to 20% by weight in the water-based flexographic printing ink composition.
(Solvent component)
An aqueous medium can be employed as the solvent component used in the aqueous flexographic printing ink composition for forming the printing layer in the present invention.
Aqueous media include water or mixtures of water and water-miscible solvents. Examples of water-miscible solvents include lower alcohols, polyhydric alcohols, and alkyl ethers or alkyl esters thereof. Specific examples include lower alcohols such as methanol, ethanol, normal propanol, and isopropanol. , ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, polyhydric alcohols such as glycerin, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monoacetate, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monoacetate, diethylene glycol monomethyl ether, dipropylene glycol monomethyl ether and the like.

(Other ingredients)
In addition to the above components, the water-based flexographic printing ink composition of the present invention may optionally contain a film-forming agent, a pigment dispersant or a pigment-dispersing resin, an antiblocking agent, a wetting agent, a viscosity modifier, and a pH adjuster. Various additives such as agents, antifoaming agents and general surfactants can be appropriately selected and used.
(Method for producing water-based flexographic printing ink composition)
As a method for producing a water-based flexographic printing ink composition using these materials, a pigment, a binder resin, and an aqueous medium are mixed and kneaded, and then additives, an aqueous medium, and the rest of the predetermined materials are added. , the method of mixing is common.

(Printing method using water-based flexographic printing ink composition, and laminate obtained thereby)
Next, a method for obtaining a printed matter using the water-based flexographic printing ink composition will be described.
A detachable primer composition is applied to a resin substrate to form a detachable primer layer. Then, inline or offline, after applying an adhesive, after laminating a paper substrate, the paper substrate is subjected to flexographic printing with a water-based flexographic printing ink composition using a normal printing method. The printing speed and drying temperature at this time can be appropriately selected from known speeds and temperatures.
And as this resin base material, said polyethylene (PE) etc. can be employ|adopted.

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 desorption primer composition used in Examples and Comparative Examples has a solvent mass composition of ethanol 8:water 2 mixture. In addition, it is not limited to this mixture.

<Example of reverse side printing>
<Production example of polyurethane resin varnish 1 (biomass polyurethane)>
Sebacic acid (derived from castor oil) / succinic acid (derived from plant) = 30/70 (mass ratio) and 1,3-propanediol (derived from plant ), 17.6 parts by mass of isophorone diisocyanate, and 21.0 parts by mass of hydrogenated MDI were charged and heated at 100 to 105°C while introducing nitrogen gas. It was reacted for 6 hours. 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. was added to react, and then 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 1 (solid content: 30% by mass, amine value: 6.4 mgKOH/g). Obtained.

<Production example of polyurethane resin varnish 2 (non-biomass polyurethane)>
100 parts by mass of 3-methyl-1,5-pentylene adipate diol having a number average molecular weight of 2,000 and polypropylene having a mass average molecular weight of 2,000 were placed in a four-necked flask equipped with a stirrer, a condenser tube and a nitrogen gas inlet tube. 100 parts by mass of glycol, 17.6 parts by mass of isophorone diisocyanate, and 21.0 parts by mass of hydrogenated MDI were charged and reacted at 100 to 105° C. for 6 hours while introducing nitrogen gas. 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. was added to react, and then 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 2 (solid content: 30% by mass, amine value: 6.4 mgKOH/g). Obtained.

<Polyurethane resin varnish 3 (Polyurethane resin varnish obtained using a compound in which the amino group of a polyamine compound is ketiminized with a ketone compound)> production example (method for producing ketimine solution 1)
51 parts of isophoronediamine, 31.2 parts of N-(2-hydroxyethyl)ethylenediamine, and 174 parts of acetone were mixed and stirred at room temperature for 1 hour to obtain a ketimine solution 1.
(Method for producing polyurethane resin)
400 parts of 3-methyl-1,5-pentylene adipate diol having a number average molecular weight of 4,000, 33.3 parts of isophorone diisocyanate and tetrabutyl 0.04 part of titanate was charged and reacted at 90 to 100° C. for 6 hours while nitrogen gas was introduced.
Next, after adding 812 parts of propyl acetate and 203 parts of isopropyl alcohol, the mixture was cooled to near room temperature, 32.29 parts of the above ketimine solution 1 was added and stirred for 20 minutes, and 3 parts of water was further added and stirred for 15 minutes. A polyurethane resin varnish 3 (solid content: 30%) having a mass average molecular weight of 35,000 and an amine value of 6.5 mgKOH/g was obtained.

<Vinyl chloride/vinyl acetate copolymer>
Solbin TA-3, Nissin Chemical Industry <Rosin and its derivatives>
Polymerized rosin: acid value 160 mgKOH/g
<Chlorinated polypropylene varnish>
40 parts by mass of chlorinated polypropylene (solid content: 50 mass %) having a degree of chlorination of 40% and a mass average molecular weight of 100,000 and 60 parts by mass of methylcyclohexane were mixed and stirred to obtain a chlorinated polypropylene varnish with a solid content of 20 mass %. .
<Silica particles>
Average particle size: 4.5 μm
<Polyethylene wax>
Average particle size: 2.11 μm
<Fatty acid amide>
Ethylene bis stearamide

<Production Example of Printing Ink Composition for Reverse Printing>
10 parts by mass of pigment (C.I.PB15:4), 30 parts by mass of polyurethane resin varnish 1, 3 parts by mass of vinyl chloride/vinyl acetate copolymer (Solbin TA-3), Red Devil's paint conditioner 2 parts by mass of chlorinated propylene varnish (solid content 20%), 0.5 parts by mass of polymerized rosin, 0.5 parts by mass of silica particles, 0.2 parts by mass of polyethylene wax, ethylene bis stearic acid 0.2 parts by mass of amide, 51 parts by mass of solvent and 2 parts by mass of water were added to obtain a printing ink composition 1 for reverse printing.
Further, two types of printing ink compositions for reverse printing were obtained in the same manner except that polyurethane resin varnishes 2 and 3 were used in place of polyurethane resin varnish 1, to give a total of three types of printing inks for reverse printing. A composition was obtained.

(Print base material)
P-2161 #25: Biaxially oriented polypropylene film (thickness 25 μm) (Toyobo)
(desorption primer)
Polybutadiene compound (trade name: Titabond T-180E, (solid content concentration 10% by mass) Nippon Soda Co., Ltd.)

(Reverse printing and creation of laminated printed matter, test results)
<Dry laminate 1 (base film: normal film)>
Each detachment primer composition obtained by diluting the polybutadiene-based compound was applied to one side (treated side) of P-2161#25 so as to obtain the laminate structure 1 below, so that the coating amount was as shown in Table 1 below. , was applied and dried under the following conditions using a gravure printing machine. The coating amount in Tables 1 and 2 is the amount of the polybutadiene compound. On the surface of the polybutadiene layer, which is the detachment primer layer, a mixed solvent of normal propyl acetate/isopropyl alcohol = 80/20 was added to each printing ink composition for reverse printing, and Zahn cup No. Each diluted ink composition diluted to 16 seconds in No. 3 was printed and dried under the following conditions using a gravure printer to obtain a printed material.
An adhesive (Takelac A-969V/Takelac A-5, solid content 30% by mass) was applied thereon, and aluminum-deposited CPP was further adhered with a dry laminator to prepare a laminated print having the following laminate structure 1. .
<Dry laminate 2 (base film: transparent deposition film)>
Each desorption primer composition obtained by diluting the above polybutadiene-based compound so that the coating amount shown in Table 1 below is applied to one side (treated surface) of transparent vapor deposition PET or transparent vapor deposition NY so as to obtain laminate structure 2 below. The material was coated and dried by a gravure printing machine under the following conditions. The coating amount in Tables 1 and 3 is the amount of the polybutadiene compound. On the surface of the polybutadiene layer, which is the detachment primer layer, a mixed solvent of normal propyl acetate/isopropyl alcohol = 80/20 was added to each printing ink composition for reverse printing, and Zahn cup No. Each diluted ink composition diluted to 16 seconds in No. 3 was printed and dried under the following conditions using a gravure printer to obtain a printed material.
An adhesive (Takelac A-515/Takelac A-50, solid content 30% by mass) is applied on it, and the following RXC-22#60 is adhered with a dry laminator to obtain the following laminate structure 2 Laminated printed matter It was created.

<Extrusion lamination 1>
The polybutadiene-based compound was diluted so that the coating amount was as shown in Table 1 below on one side (treated surface) of PET or NY or transparent vapor deposition PET or transparent vapor deposition NY so that the following laminate structure 3 was obtained. The release primer composition was applied and dried using a gravure printer under the following conditions. The coating amount in Tables 1 and 4 is the amount of the polybutadiene compound. On the surface of the polybutadiene layer, which is the detachment primer layer, a mixed solvent of normal propyl acetate/isopropyl alcohol = 80/20 was added to each printing ink composition for reverse printing, and Zahn cup No. Each diluted ink composition diluted to 16 seconds in No. 3 was printed and dried under the following conditions using a gravure printer to obtain a printed matter.
An AC agent (Takelac A-3210/Takelac A-3072, solid content 7% by mass) was applied thereon, and molten polyethylene was further laminated by an extrusion laminator to prepare a laminated print having the following laminate structure 3.

<Extrusion lamination 2>
On the treated surface of the OPP film so as to have the following laminate structure 4, each desorption primer composition obtained by diluting the polybutadiene compound as shown in Table 1 below was applied with a gravure printer under the following conditions. Coated and dried. The coating amount in Table 5 is the amount of the polybutadiene compound. On the surface of the polybutadiene layer, which is the detachment primer layer, a mixed solvent of normal propyl acetate/isopropyl alcohol = 80/20 was added to each printing ink composition for reverse printing, and Zahn cup No. Each diluted ink composition diluted to 16 seconds in No. 3 was printed and dried under the following conditions using a gravure printer to obtain a printed material.
An AC agent (Epomin P-1000, solid content 0.7% by mass) was applied thereon, and molten polyethylene was further laminated by an extrusion laminator to prepare a laminated print having the following laminated structure 4.

(Conditions for applying each desorption primer composition)
Coating machine: Gravure printing machine Coating speed: 100 m/min
Printing plate: Helio 175 line/inch (130°) solid plate (wet coating amount is ^about 6 g/m2)
Drying temperature: 70°C

(Printing conditions of printing ink composition for reverse printing)
Coating machine: Gravure printing machine Coating speed: 100 m/min
Printing plate: Helio 175 line/inch (130°) solid plate Drying temperature: 70°C

(Laminate structure 1)
: OPP film/polybutadiene-based compound/printing ink composition for back printing 1/adhesive (Takelac A-969V/Takelac A-5 solid content 30% by mass)/aluminum-deposited CPP film OPP film: Corona-discharged biaxially oriented propylene Film P-2161 #25 (thickness 25 μm) (Toyobo)
Adhesive (Takelac A-969V/Takelac A-5): Aromatic ether-based two-liquid adhesive solid content 30% by mass (Mitsui Chemicals, Inc.)
Aluminum-deposited CPP film: trade name CP WS (Mitsui Chemicals Tocello Co., Ltd.)
(Laminate structure 2)
: Transparent vapor-deposited PET film or transparent vapor-deposited NY film/polybutadiene/printing ink composition for each back printing/adhesive (Takelac A-515/Takelac A-50, solid content 30% by mass) solid content 30%)/RXC-22 #60
Deposited PET film: GL-ARH-F (Toppan Printing Co., Ltd.)
Transparent deposition NY film: GL-ARH-W (Toppan Printing Co., Ltd.)
Adhesive (Takelac A-515/Takelac A-50): 2-liquid adhesive solid content 30% by mass (Mitsui Chemicals)
RXC-22#60: Unstretched propylene film (Mitsui Chemicals Tocello)
(Laminate structure 3)
: PET film or NY film or transparent vapor-deposited PET film or transparent vapor-deposited NY film/polybutadiene/printing ink composition for each back printing/AC agent (Takelac A-3210/Takelac A-3072, solid content 7% by mass)/molten polyethylene PET film: Polyester film E-5102 #12 (Toyobo)
NY film: Nylon film ON-15#12 (Unitika Ltd.)
Deposited PET film: GL-ARH-F (Toppan Printing Co., Ltd.)
Transparent deposition NY film: GL-ARH-W (Toppan Printing Co., Ltd.)
AC agent (Takelac A-3210/Takelac A-3072): solid content 7% by mass (Mitsui Chemicals)
Molten polyethylene: Sumikasen L705, resin temperature 355°C (Sumitomo Chemical Co., Ltd.)
(Laminate structure 4)
: OPP film / polybutadiene / each printing ink composition for back printing / AC agent (Epomin P-1000, solid content 0.7% by mass) / molten polyethylene OPP film: Corona discharged biaxially stretched propylene film P-2161 #25 (Toyobo)
AC agent (Epomin P-1000): polyethyleneimine solid content 0.7% by mass (Nippon Shokubai Co., Ltd.)
Molten polyethylene: Sumikasen L705, resin temperature 355°C (Sumitomo Chemical Co., Ltd.)

<Evaluation of Ink Releasability>
(Sample for ink removability test)
After printing, 1.5 g of each of the above-mentioned printed materials, which had been sufficiently dried, was chopped into small pieces of about MD 15 mm×TD 25 mm to obtain samples for the ink releasability test.
(Preparation of Desorption Solution 1 Consisting of Water)
Elimination liquid 1 consisting only of water
(Preparation of Desorption Liquid 2 Consisting of Alkaline Solution)
2.0 parts by mass of sodium hydroxide was added to 98.0 parts by mass of water, and the mixture was stirred and dissolved to obtain a stripping liquid 2 composed of an alkaline aqueous solution.
(Preheating of desorption liquid 1)
100 g of desorption liquid 1 consisting of water was placed in each container made of HDPE (high density polyethylene) with a capacity of 200 cc, and heated to a liquid temperature of 70° C. using a hot water bath.
(Preheating of desorption liquid 2)
100 g of desorption liquid 2 consisting of an alkaline aqueous solution was placed in each container made of HDPE (high density polyethylene) with a capacity of 200 cc, and heated to a liquid temperature of 70° C. using a hot water bath.
(detachment)
After each desorption liquid reaches 70° C., each ink desorption test sample is put into each of the desorption liquid 1 made of water and the desorption liquid 2 made of alkaline aqueous solution. Using a stainless steel stirring blade with a diameter of 25 mm, the desorbing liquid 1 consisting of water was stirred for 60 minutes, and the desorbing liquid 2 consisting of an alkaline aqueous solution was stirred for 30 minutes. After stirring, the HDPE (high density polyethylene) container was taken out from the hot water bath and allowed to stand at room temperature for 5 minutes. The desorbed liquid and various film pieces were separated using a stainless steel net with an opening of about 2 mm.
(rinse)
Various films after detachment were transferred to a 200 cc HDPE container, and 100 g of water was added. Stirred for 5 minutes using a stainless steel stirring blade with a blade diameter of 25 mm. After standing for 5 minutes, the various film pieces and water were separated using a stainless steel mesh. After drying the various film pieces, the releasability of the ink from the various films was visually evaluated.

Desorption (alkali) conditions: Stir in 2% sodium hydroxide aqueous solution at 70°C for 30 minutes (evaluation criteria)
○: The ink coating was completely peeled from the film as a coating piece ×: Not peeled

Desorption (hot water) conditions: Stir in hot water at 70°C for 60 minutes (evaluation criteria)
○: The ink coating was completely peeled from the film as a coating piece ×: Not peeled

Tape adhesion strength (each print immediately after printing and drying)
Using a gravure printer on the treated surface of various films, each desorption primer composition obtained by appropriately diluting the above polybutadiene-based compound as shown in Table 1 above was applied to a predetermined coating amount by a gravure printer. was applied and dried under the above conditions. On the surface of each layer made of this polybutadiene-based compound, a mixed solvent of normal propyl acetate/isopropyl alcohol = 80/20 was further added to printing ink composition 1 for reverse printing, and Zahn cup No. Diluted ink composition 1 diluted to 16 seconds at 3 was printed under the above conditions using a gravure printer and dried to obtain each print.
Adhesiveness was evaluated according to the following evaluation criteria from the degree of peeling of the printed film when a cellophane tape was attached to the printed surface of each of the obtained prints and quickly peeled off. (Evaluation criteria)
○: Peeling from the film was less than 5% as an area ratio of the printed film.
Δ: 5% or more and less than 30% of the area ratio of the printed film was peeled off from the film.
x: 30% or more of the area ratio of the printed film was peeled off from the film.

Laminate Strength Each laminated print was cut into pieces of 15 mm in width, and the T-peel strength was measured using a peel tester manufactured by Yasuda Seiki Seisakusho.
(Evaluation criteria)
○: Peel strength of 1.2 N/15 mm or more △: Peel strength of 0.7 N/15 mm or more and less than 1.2 N/15 mm ×: Peel strength of less than 0.7 N/15 mm

Blocking resistance Using a gravure printing machine, each detachment primer composition obtained by appropriately diluting the polybutadiene-based compound as shown in Table 1 above so as to have a predetermined coating amount was applied to the treated surface of various films. It was applied and dried under the above conditions using a gravure printer. On the surface of each layer made of this polybutadiene-based compound, a mixed solvent of normal propyl acetate/isopropyl alcohol = 80/20 was added to printing ink composition 1 for reverse printing, and Zahn cup No. Diluted ink composition 1 diluted to 16 seconds in No. 3 was printed under the following conditions using a gravure printing machine, and dried. ² was applied and allowed to stand at 40° C. for 12 hours, and then the blocking resistance was evaluated from the appearance when each film was peeled off.
(Evaluation criteria)
○: Peeled off with no resistance and no transfer of ink film △: There was resistance but no transfer of ink film ×: Transfer of ink film was observed

For the printing ink composition for reverse printing, three types of polyurethane resin varnishes (polyurethane resin varnish 1 (biomass polyurethane), polyurethane resin varnish 2 (non-biomass polyurethane), and the amino group of the polyamine compound were ketiminated with a ketone compound. The following evaluations were the same when using any of the printing ink compositions for reverse printing using the polyurethane resin varnish 3) obtained by using the compound. Therefore, the results for polyurethane resin varnish 1 (biomass polyurethane) are shown below.
Table 2 shows the results for laminate structure 1, Table 3 shows the results for laminate structure 2, Table 4 shows the results for laminate structure 3, and Table 5 shows the results for laminate structure 4. be.

<Comparison example of reverse side printing>
Dry laminates 1 and 2 and extrusion laminates 1 and 2 were prepared as comparative examples. Dry Laminate 1 of Comparative Example was obtained using the same material and method as Dry Laminate 1 of Example except that the primer composition used was changed. Hereinafter, similarly, the dry laminate 2 of the comparative example is the dry laminate 2 of the example, the dry laminate 1 of the comparative example is the extrusion laminate 1 of the example, and the dry laminate 2 of the comparative example is the extrusion laminate 2 of the example. were obtained using the same materials and methods, except that the primer composition used was changed.
Then, in dry laminates 1 and 2 and extrusion laminates 1 and 2 of Comparative Examples, two types of primer compositions for release were used in each laminate, one using the following PVA and the following general-purpose polyurethane. used.

<Dry laminate 1 of comparative example (base film: normal film)> (Note that dry laminate 2 of comparative example and extrusion laminates 1 and 2 of comparative example below are similar to dry laminate 1 of comparative example. For the laminate structure, samples were prepared by using the following two kinds of the following comparative desorption primer compositions separately.Therefore, for the laminate structure of each comparative example, one using the following PVA and the following general-purpose polyurethane Two types were obtained using
Each detachment primer composition of the comparative example was appropriately diluted to a predetermined coating amount using a gravure printing machine on one side (treated side) of P-2161 #25 so as to have the following laminate structure 1. The material was coated and dried by a gravure printing machine under the following conditions. A mixed solvent of normal propyl acetate/isopropyl alcohol = 80/20 was further added to printing ink composition 1 for reverse printing on the surface of each of the primer composition layers for removal, and Zahn cup No. Diluted ink composition 1 diluted to 16 seconds in 3 was printed using a gravure printer under the following conditions and dried to obtain a printed matter.
An adhesive (Takelac A-969V/Takelac A-5, solid content 30% by mass) was applied thereon, and an aluminum-deposited CPP film was further adhered by a dry laminator to prepare a laminated print having the following structure.

<Dry Laminate 2 of Comparative Example (Base Film: Transparent Deposited Film)>
Each of the following comparative examples was diluted to a predetermined coating amount using a gravure printing machine on the treated surface of various films of transparent vapor deposition PET or transparent vapor deposition NY so as to have the following laminate structure 2. The detachment primer composition was applied and dried under the following conditions using a gravure printer to obtain a printed material. Further, a mixed solvent of normal propyl acetate/isopropyl alcohol = 80/20 was added, and the Zahn cup No. Each diluted ink composition diluted to 16 seconds in No. 3 was printed under the following conditions using a gravure printing machine and dried to obtain a printed matter.
Adhesive (Takelac A-515/Takelac A-50, solid content 30% by mass) is applied on top of it, and RXC-22#60 is further adhered with a dry laminator to create a laminated print of Structure 2 below. bottom.

<Extrusion laminate 1 of comparative example>
Using a gravure printing machine, the treated surface of PET or NY or transparent vapor deposition PET or transparent vapor deposition NY was diluted to a predetermined amount of coating so as to have the following laminate structure 3. Each of the detachment primer compositions was applied by a gravure printer under the following conditions and dried to obtain two detachment primer layer-formed resin substrates. Further, a mixed solvent of normal propyl acetate/isopropyl alcohol = 80/20 was added, and the Zahn cup No. Each diluted ink composition diluted to 16 seconds in No. 3 was printed under the following conditions using a gravure printing machine and dried to obtain a printed matter.
An AC agent (Takelac A-3210/Takelac A-3072, solid content 7% by mass) was applied thereon, and molten polyethylene was further laminated by an extrusion laminator to prepare a laminated print having Structure 3 below.

<Extrusion laminate 2 of comparative example>
Using a gravure printing machine on the treated surface of the OPP film so as to obtain the laminate structure 4 below, each of the primer compositions for removal of the following comparative examples diluted to a predetermined amount of application, By applying and drying under the following conditions using a gravure printer, two resin substrates on which a detachment primer layer had been formed were obtained. A normal propyl acetate/isopropyl alcohol = 80/20 mixed solvent was further added to each printing ink composition for reverse printing on the surface of each of the primer compositions for detachment. Each diluted ink composition diluted to 16 seconds in No. 3 was printed under the following conditions using a gravure printing machine and dried to obtain a printed material.
An AC agent (Epomin P-1000, solid content: 0.7% by mass) was applied thereon, and molten polyethylene was further laminated by an extrusion laminator to prepare a laminated print having Structure 4 below.

(Application method and application conditions for each detachment primer composition in Comparative Examples)
Coating machine: Gravure printing machine Coating speed: 100 m/min
Printing plate: Helio 175 line/inch (130°) solid plate Drying temperature: 70°C

(Printing method and printing conditions of printing ink composition for reverse printing)
Coating machine: Gravure printing machine Coating speed: 100 m/min
Printing plate: Helio 175 line/inch (130°) solid plate
Drying temperature: 55°C

Laminate Structure 1 of Comparative Example (Note that Laminate Structures 2 to 4 of Comparative Examples below are also similar to Laminate Structure 1 of Comparative Example. For each laminate structure, the following two types of primer compositions for removal of Comparative Examples are individually applied. Therefore, two types of laminated structures were obtained for each comparative example, one using the following PVA and the following general-purpose polyurethane.)
: OPP film/comparative release primer composition/printing ink composition for each back printing/adhesive (Takelac A-969V/Takelac A-5 solid content 30% by mass)/aluminum-deposited CPP film OPP film: Corona Discharged biaxially stretched propylene film P-2161#25 (thickness 25 μm) (Toyobo)
Adhesive (Takelac A-969V/Takelac A-5): Aromatic ether-based two-liquid adhesive solid content 30% by mass (Mitsui Chemicals, Inc.)
Aluminum-deposited CPP film: trade name CP WS (Mitsui Chemicals Tocello Co., Ltd.)

Laminate structure 2 of comparative example
: Transparent vapor-deposited PET film or transparent vapor-deposited NY film/comparative example of the following primer composition for removal/printing ink composition for each back printing/adhesive (Takelac A-515/Takelac A-50, solid content 30% by mass) Solid content 30%) / RXC-22 # 60
Transparent vapor-deposited PET film: GL-ARH-F (Toppan Printing Co., Ltd.)
Transparent deposition NY film: GL-ARH-W (Toppan Printing Co., Ltd.)
Adhesive (Takelac A-515/Takelac A-50): 2-liquid adhesive solid content 30% by mass (Mitsui Chemicals)
RXC-22#60: Unstretched propylene film (Mitsui Chemicals Tocello)

Laminate structure 3 of comparative example
: PET film or NY film or transparent vapor-deposited PET film or transparent vapor-deposited NY film/removal primer composition of each comparative example/printing ink composition for each back printing/AC agent (Takelac A-3210/Takelac A-3072, Solid content 30% by mass) / molten polyethylene PET film: polyester film E-5102 # 12 (Toyobo)
NY film: Nylon film ON-15#12 (Unitika Ltd.)
Transparent vapor-deposited PET film: GL-ARH-F (Toppan Printing Co., Ltd.)
Transparent deposition NY film: GL-ARH-W (Toppan Printing Co., Ltd.)
AC agent (Takelac A-3210/Takelac A-3072): solid content 30% by mass (Mitsui Chemicals)
Molten polyethylene: Sumikasen L705, resin temperature 355°C (Sumitomo Chemical Co., Ltd.)

Laminate structure 4 of comparative example
: OPP film/comparative release primer composition/printing ink composition for reverse printing/AC agent (Epomin P-1000, solid content 0.7% by mass)/molten polyethylene OPP film: corona discharged two Axial stretched propylene film P-2161#25 (Toyobo)
AC agent (Epomin P-1000): polyethyleneimine solid content 0.7% by mass (Mitsunippon Shokubai Co., Ltd.)
Molten polyethylene: Sumikasen L705, resin temperature 355°C (Sumitomo Chemical Co., Ltd.)

(Primer composition for detachment of comparative example)
PVA: Poval 28-98 (polyvinyl alcohol with saponification degree of 90% or more) (Kuraray Co., Ltd.)
General-purpose polyurethane: Polyurethane resin 2 described above (not biomass polyurethane)

For the printing ink composition for reverse printing, three types of polyurethane resin varnishes (polyurethane resin varnish 1 (biomass polyurethane), polyurethane resin varnish 2 (non-biomass polyurethane), amino groups of polyamine compounds were ketimined with ketone compounds. The following evaluations were the same when using any of the printing ink compositions for reverse printing using the polyurethane resin varnish 3) obtained by using the compound. Therefore, the results for polyurethane resin varnish 1 (biomass polyurethane) are shown below.
Table 6 shows the results for the laminate structure 1 of the comparative example, Table 7 shows the results for the laminate structure 2 of the comparative example, Table 8 shows the results for the laminate structure 3 of the comparative example, and Table 9 is the result for the laminate structure 4 of the comparative example.
Ink releasability, adhesiveness, and laminate strength were evaluated by the same method and evaluation criteria as above.
However, the ink releasability was tested with an alkaline aqueous solution of the desorbing liquid 2. Elimination liquid 2 was obtained by adding 2 parts by mass of sodium hydroxide to 98.0 parts by mass of water and stirring and dissolving the mixture.

According to the results shown in Tables 2 to 5, when the detachment primer composition of the present invention was applied, it was smoothly detached with both water and an alkaline aqueous solution. In addition, the adhesiveness immediately after printing, lamination strength and blocking resistance were also excellent.
However, when the detachable primer composition of the present invention was not applied, and when PVA and general-purpose polyurethane in Tables 6 to 9 were applied, both detachability and excellent laminate strength could not be achieved.
Regarding this comparative example, even when polyurethane resin varnishes 2 and 3 were employed in place of polyurethane resin varnish 1, similar results were obtained.

<Example of surface printing>
(polyurethane resin varnish)
100 parts by mass of 3-methyl-1,5-pentylene adipate diol having a number average molecular weight of 2,000 and a 100 parts by mass of polypropylene glycol, 17.6 parts by mass of isophorone diisocyanate, and 21.0 parts by mass of hydrogenated MDI were charged and reacted at 100 to 105° C. for 6 hours while introducing nitrogen gas. Allow to cool to near room temperature, add 523.3 parts by mass of ethyl acetate and 223.8 parts by mass of isopropyl alcohol, then add 8.2 parts by mass of isophoronediamine for chain extension, and further add 0 parts by mass of monoethanolamine. 0.35 parts by mass of the mixture was added to react, and then 1.3 parts by mass of isophoronediamine and 0.6 parts by mass of diethylenetriamine were added to stop the reaction to obtain a urethane resin (polyurethane resin varnish (solid content: 25% by mass)). rice field.

(CAB)
Cellulose acetate butyrate (Eastman Chemical Company, number average molecular weight 70,000, butyryl degree 35-39%)

(Nitrated cotton)
35 parts by mass of nitrocellulose (hydrated with 30% by weight of water) (NOBEL NC CO., Ltd. DLX5-8) was dissolved in a mixed solvent consisting of 58 parts of ethyl acetate and 7 parts of isopropyl alcohol. to obtain a nitrocellulose solution having a solid content of 35% by mass.

(polyamide resin)
Thermoplastic polyamide resin (Mw 8,000, acid value 2, softening point 110°C) using tall oil fatty acid as a reaction raw material
(PVC)
Solbin TA5R (Nissin Chemical Industry Co., Ltd.)
(acrylic resin)
Hylos-X RL-4032 (solid content 40% by mass) (Seiko PMC)
(polyethylene wax)
PA-60 (solid content 25% by mass) (Polycon)
(titanium oxide)
Typaque PFR209 (Ishihara Sangyo Co., Ltd.)

<Preparation of printing ink composition>
Each material was kneaded with a paint conditioner according to the mass ratio (% by mass) in Table 10 below to prepare a printing ink composition. Further, the obtained printing ink composition was subjected to gravure printing under the following conditions to obtain a printed material. Adhesiveness and releasability of the obtained prints were evaluated according to the following evaluation methods.

<Production of printed matter>
A polybutadiene-based compound (Titabond T-180E), which has been appropriately diluted to a predetermined coating amount, was applied to a corona discharge-treated oriented polypropylene film (trade name: OPP P-2161, 25 μm, Toyobo Co., Ltd.) using a gravure printer under the following conditions. to obtain a layer composed of a polybutadiene-based compound having the coating amount shown in Table 11. Further, for each printing ink composition for surface printing in Table 10 below, a solvent was added so that the type of solvent contained in each printing ink composition for surface printing and the mass ratio of the content between each solvent did not change. In addition, Rigosha Zahn Cup No. Each diluted surface printing ink composition diluted to 16 seconds at 3 was obtained. Next, each diluted surface printing ink composition was printed on the surface of the polybutadiene-based compound layer using a gravure printer under the following conditions and dried to obtain each surface printing ink composition printed material. 1.5 g of printed matter of each printing ink composition for surface printing was cut into small pieces of about MD 15 mm×TD 25 mm to obtain samples for printing layer peeling test.

(Method and conditions for applying primer composition for detachment)
Coating machine: Gravure printing machine Coating speed: 100 m/min
Printing plate: Helio 175 line/inch (130°) solid plate Drying temperature: 70°C
(Printing method and printing conditions of printing ink composition for surface printing)
Coating machine: Gravure printing machine Coating speed: 100 m/min
Printing plate: Helio 175 line/inch (130°) solid plate
Drying temperature: 55°C
Ink releasability and adhesiveness were evaluated by the same method and evaluation criteria as described above.

<Evaluation of adhesion to substrate>
Adhesiveness was evaluated according to the following evaluation criteria from the degree of peeling of the printed film when a cellophane tape was attached to each printed surface of each printed matter obtained in the production of printed matter and rapidly peeled off.

(Evaluation criteria)
○: Peeling from the film was less than 5% as an area ratio of the printed film.
Δ: 5% or more and less than 30% of the area ratio of the printed film was peeled off from the film.
x: 30% or more of the area ratio of the printed film was peeled off from the film.

<Print layer peeling test method>
(Preparation of Desorption Solution 1 Consisting of Water)
Elimination liquid 1 consisting only of water
(Preparation of Desorption Liquid 2 Consisting of Alkaline Solution)
2.0 parts by mass of sodium hydroxide was added to 98.0 parts by mass of water, and the mixture was stirred and dissolved to obtain a stripping liquid 2 composed of an alkaline aqueous solution.

(Preheating of desorption liquid 1)
100 g of desorption liquid 1 consisting of water was placed in each container made of HDPE (high density polyethylene) with a capacity of 200 cc, and heated to a liquid temperature of 70° C. using a hot water bath.
(Preheating of desorption liquid 2)
100 g of desorption liquid 2 consisting of an alkaline aqueous solution was placed in each container made of HDPE (high density polyethylene) with a capacity of 200 cc, and heated to a liquid temperature of 70° C. using a hot water bath.
(detachment)
After each desorbed liquid reaches 70 ° C., each sample for the printed layer peeling test is put into the desorbed liquid, and a stainless steel stirring blade with a blade diameter of 25 mm is used to remove the desorbed liquid 1 made of water. was stirred for 60 minutes in the case of . After stirring, the HDPE (high density polyethylene) container was taken out from the hot water bath and allowed to stand at room temperature for 5 minutes. The stripped liquid and the film pieces were separated using a stainless steel mesh with an opening of about 2 mm.
(rinse)
The detached film was transferred to a 200 cc HDPE container, and 100 g of water was added. Stirred for 5 minutes using a stainless steel stirring blade with a blade diameter of 25 mm. After standing for 5 minutes, the film pieces and water were separated using a stainless steel mesh. After drying the film pieces, the releasability of the ink from the film was visually evaluated.

Desorption (alkali) conditions: Stir in 2% sodium hydroxide aqueous solution at 70°C for 30 minutes (evaluation criteria)
○: The ink coating was completely peeled from the film as a coating piece ×: Not peeled

Desorption (hot water) conditions: Stir in hot water at 70°C for 60 minutes (evaluation criteria)
○: The ink coating was completely peeled from the film as a coating piece ×: Not peeled

When the primer composition for stripping in Table 11: a polybutadiene-based compound is applied, water or an alkaline aqueous solution can be used as the stripping liquid in any of the surface printing ink compositions 1 to 8. , it was possible to detach, and the adhesion to a corona discharge-treated stretched polypropylene film (trade name: OPP P-2161, 25 µm, Toyobo Co., Ltd.) was also good.

<Example of shrink printing>
(acrylic resin synthesis)
After polymerization by solution polymerization with a monomer composition [n-butyl methacrylate/n-butyl acrylate/2-hydroxyethyl methacrylate/methyl methacrylate = 35/20/15/30 (mass ratio)], the solvent was evaporated. board. Mass average molecular weight: 60,000, hydroxyl value: 60 mgKOH/g.

(Production of Printing Ink Composition 1 for Shrink Packaging)
Pigment (C.I.PB15:4) 10.0 parts by mass, 10.0 parts by mass of the above acrylic resin, nitrocellulose (product name: LIG 1/8, SNP Japan) 3.5 parts by mass, methylcyclohexane 20.0 parts by mass, 35.5 parts by mass of isopropyl alcohol, and 21.0 parts by mass of ethyl acetate were kneaded and dispersed by a conventional method to produce a printing ink composition 1 for shrink packaging.

(Production of Printing Ink Composition 2 for Shrink Packaging)
10.0 parts by mass of pigment (C.I.PB15:4) and 9.0 of carboxyl group-containing acrylic resin (monomer composition: MAA/MMA/BMA theoretical acid value 3 mgKOH/g, mass average molecular weight 60,000) Parts by mass, 10.0 parts by mass of isopropyl alcohol, and 15.0 parts by mass of ethyl acetate are kneaded using a paint conditioner, and 1.2 parts by mass of the carboxyl group-containing acrylic resin, cellulose acetate butyrate (CAB-381-0 .5, Eastman Co., number average molecular weight 30,000) 5.0 parts by weight, rosin ester (acid value 7 mgKOH/g) 5.0 parts by weight, epoxidized soybean oil 1.0 parts by weight, stearic acid amide 0.5 Parts by mass, Spray 30 (Sasol) 2.2 parts by mass, BYK-094 (BYK) 0.3 parts by mass, normal propyl alcohol 4.5 parts by mass, isopropyl alcohol 27.4 parts by mass, ethyl acetate 9.1 Parts by mass were added and mixed to prepare printing ink composition 2 for shrink packaging.

(Preparation of printed matter)
On a crystallizable shrinkable PET (polyethylene terephthalate) film, the above polybutadiene compound (Titabond T-180E), which has been appropriately diluted to a predetermined coating amount, is applied with a gravure printer under the following conditions and dried. A layer composed of a polybutadiene-based compound having a coating amount described in 12 was obtained. Further, a solvent is added to each shrink packaging printing ink composition so that the type of solvent contained in each shrink packaging printing ink composition and the mass ratio of the content between each solvent do not change, Company Zahn Cup No. Each diluted shrink wrap printing ink composition diluted to 16 seconds at 3 was obtained. Next, each diluted printing ink composition for shrink packaging was printed on the surface of the polybutadiene-based compound layer using a gravure printing machine under the following conditions and dried to obtain each printed material. 1.5 g of printed matter of each printing ink composition for shrink packaging was cut into small pieces of about MD 15 mm×TD 25 mm to obtain samples for printing layer peeling test.
(Method and conditions for applying primer composition for detachment)
Coating machine: Gravure printing machine Coating speed: 100 m/min
Printing plate: Helio 175 line/inch (130°) solid plate Drying temperature: 70°C
(Printing method and printing conditions for printing ink composition for shrink packaging)
Coating machine: Gravure printing machine Coating speed: 100 m/min
Printing plate: Helio 175 line/inch (130°) solid plate Drying temperature: 55°C

<Evaluation of adhesion to substrate>
Adhesiveness was evaluated according to the following evaluation criteria from the degree of peeling of the printed film when cellophane tape was attached to each printed surface of each printed matter obtained in the production of the printed matter and rapidly peeled off.
(Evaluation criteria)
○: Peeling from the film was less than 5% as an area ratio of the printed film.
Δ: 5% or more and less than 30% of the area ratio of the printed film was peeled off from the film.
x: 30% or more of the area ratio of the printed film was peeled off from the film.

<Print layer peeling test method>
(Preparation of Desorption Solution 1 Consisting of Water)
Elimination liquid 1 consisting only of water
(Preparation of Desorption Liquid 2 Consisting of Alkaline Solution)
2.0 parts by mass of sodium hydroxide was added to 98.0 parts by mass of water, and the mixture was stirred and dissolved to obtain a stripping liquid 2 composed of an alkaline aqueous solution.

(Preheating of desorption liquid 1)
100 g of desorption liquid 1 consisting of water was placed in each container made of HDPE (high density polyethylene) with a capacity of 200 cc, and heated to a liquid temperature of 70° C. using a hot water bath.
(Preheating of desorption liquid 2)
100 g of desorption liquid 2 consisting of an alkaline aqueous solution was placed in each container made of HDPE (high density polyethylene) with a capacity of 200 cc, and heated to a liquid temperature of 70° C. using a hot water bath.
(detachment)
After the temperature of the desorbing liquid reaches 70° C., the sample for the printed layer peeling test is put into each desorbing liquid, and the desorbing liquid made of water is stirred using a stainless steel stirring blade with a blade diameter of 25 mm. Stirred for 60 minutes in the case of 1, and for 30 minutes in the case of desorbed liquid 2 consisting of an alkaline aqueous solution. After stirring, the HDPE container was taken out from the hot water bath and allowed to stand at room temperature for 5 minutes. The stripped liquid and the PET (polyethylene terephthalate) film pieces were separated using a stainless steel mesh with an opening of about 2 mm.
Desorption (alkali) conditions: Stir in 2% sodium hydroxide aqueous solution at 70°C for 30 minutes (evaluation criteria)
○: The ink coating was completely peeled from the film as a coating piece ×: The coating was not peeled off (hot water) Conditions: Stirred in hot water at 70°C for 60 minutes (evaluation criteria)
○: The ink coating was completely peeled from the film as a coating piece ×: Not peeled

According to Table 12, when the polybutadiene-based compound was applied, in both the printing ink compositions for shrink packaging 1 and 2, even if water or an alkaline aqueous solution was used as the detachment liquid, detachment did not occur. Adhesion to shrinkable PET film, which is possible and crystallizable, was also good.

<Example of printing on the paper substrate side of laminated paper>
(Production of water-based flexographic printing ink composition)
<Method for producing water-based printing ink>
15 parts by weight of pigment (phthalocyanine blue, C.I. Pigment Blue 15:3), 15 parts by weight of alkali-soluble water-soluble resin (Joncryl HPD-671, manufactured by BASF, solid content 25%), (ethylene A mixture of 0.5 parts by mass of (EO/PO) block polymer ((EO/PO) block polymer, HLB value 14, Mw 16000), 0.03 parts by mass of dibutyl glycol, and 22.97 parts by mass of water was kneaded in a bead mill. After dispersion, 43.25 parts by mass of a styrene-acrylic resin emulsion (acid value 38 mgKOH/g, glass transition temperature 9°C, solid content 38.5%), polyethylene wax (Chemipearl W-100, solid content 35 mass%, Mitsui Chemicals, Inc.) and 0.75 parts by mass of an antifoaming agent (SN Deformer 777#C, San Nopco) were added and mixed to obtain an aqueous flexographic printing ink composition.

(Preparation of printed matter)
Using a gravure printing machine on a linear low-density polyethylene film (TUX-HC#50, thickness 25 μm, Mitsui Chemicals Tohcello), a polybutadiene compound was diluted as shown in Table 13 below for each desorption The primer composition was applied and dried using a gravure printer under the following conditions. Adhesive (Takelac A-969V/Takelac A-5, solid content 30% by mass) is applied thereon, and thick single-glazed bleached kraft paper (OK Blizzard, 770 g/m ² , Oji Materia Co., Ltd.) is further applied with a dry laminator. ) were adhered to each other to obtain the laminated paper of the present invention. The above flexographic printing ink composition was spread on the surface of this paper using a 200-line hand proofer and dried to obtain a printed matter. 1.5 g of each printed matter was cut into small pieces of about MD 15 mm×TD 25 mm to obtain samples for printed layer peeling test.
(Method and conditions for applying primer composition for detachment)
Coating machine: Gravure printing machine
Coating speed: 100m/min
Printing plate: Helio 175 line/inch (130°) solid plate Drying temperature: 70°C
Laminate construction:
TUX-HC#50/polybutadiene compound/adhesive (Takelac A-969V/Takelac A-5 solid content 30%)/OK Blizzard (70 g/m2)/printing ink composition for flexo

<Print layer peeling test method>
(Preparation of Desorption Solution 1 Consisting of Water)
Elimination liquid 1 consisting only of water
(Preparation of Desorption Liquid 2 Consisting of Alkaline Solution)
2.0 parts by mass of sodium hydroxide was added to 98.0 parts by mass of water, and the mixture was stirred and dissolved to obtain a stripping liquid 2 composed of an alkaline aqueous solution.
(Preheating of desorption liquid 1)
100 g of desorption liquid 1 consisting of water was placed in each container made of HDPE (high density polyethylene) with a capacity of 200 cc, and heated to a liquid temperature of 70° C. using a hot water bath.
(Preheating of desorption liquid 2)
100 g of desorption liquid 2 consisting of an alkaline aqueous solution was placed in each container made of HDPE (high density polyethylene) with a capacity of 200 cc, and heated to a liquid temperature of 70° C. using a hot water bath.
(detachment)
After the temperature of the desorbing liquid reaches 70° C., the sample for the printed layer peeling test is put into each desorbing liquid, and the desorbing liquid made of water is stirred using a stainless steel stirring blade with a blade diameter of 25 mm. Stirred for 60 minutes in the case of 1, and for 30 minutes in the case of desorbed liquid 2 consisting of an alkaline aqueous solution. After stirring, the HDPE container was taken out from the hot water bath and allowed to stand at room temperature for 5 minutes. The desorbed liquid and the PET (polyethylene terephthalate) film pieces were separated using a stainless steel mesh with an opening of about 2 mm.
Desorption (alkali) conditions: Stir in 2% sodium hydroxide aqueous solution at 70°C for 30 minutes
(Evaluation criteria)
○: The paper was completely peeled from the film. ×: The paper was not peeled off.
(Evaluation criteria)
○: The paper was completely peeled from the film ×: The paper was not peeled

Laminate strength Each printed material was cut into a width of 15 mm, and the T-peel strength was measured using a peel tester manufactured by Yasuda Seiki Seisakusho.
(Evaluation criteria)
○: Peel strength of 1.2 N/15 mm or more △: Peel strength of 0.7 N/15 mm or more and less than 1.2 N/15 mm ×: Peel strength of less than 0.7 N/15 mm

According to the results shown in Table 13, when the detachment primer composition of the present invention was applied, it was smoothly detached with both water and an alkaline aqueous solution. Moreover, the lamination strength was also excellent.
However, when the detachable primer composition of the present invention was not applied and when PVA and general-purpose polyurethane in Table 6 were applied, both detachability and excellent laminate strength could not be achieved.
Regarding this comparative example, even when polyurethane resin varnishes 2 and 3 were employed in place of polyurethane resin varnish 1, similar results were obtained.

Claims (4)

A detachment primer composition containing a polybutadiene-based compound, for forming the detachment primer layer of a printed matter formed in the order of a resin base material, a detachment primer layer, and a printed layer. 2. The detachment primer composition according to claim 1, wherein the polybutadiene compound is a hydroxyl group-containing polybutadiene compound and/or a carboxyl group-containing polybutadiene compound. 3. A printed matter comprising a resin substrate, a detachment primer layer formed from the detachment primer composition according to claim 1, and a printed layer formed on the detachment primer layer. A detachable primer layer formed from the detachable primer composition according to claim 1 or 2 is formed on a resin substrate, and a paper layer is formed on the detachable primer layer via an adhesive layer. , a printed matter in which a printed layer is formed on a paper layer.