JP4465874B2 - Water-soluble printing ink composition and printed matter using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water-soluble printing ink composition suitable for printing on a shrink label attached to a synthetic resin such as polyethylene terephthalate (hereinafter referred to as PET) or a glass bottle, and a printed matter using the same, and more specifically, The present invention relates to a printed material suitable for a polystyrene-based heat-shrinkable shrink film label.
[0002]
[Prior art]
Steel cans, aluminum cans, and glass bottles are commonly used for containers such as soft drinks and coffee drinks, but in recent years, they have been replaced by PET bottles. In general, shrink labels are used for the display of the product names of these containers. Also, in glass bottles, shrink labels tend to be used rather than displays by direct printing on a body or sticking a sticker.
[0003]
When printing such a shrink label on one side of the film, generally, after printing is performed on the side in contact with the outer wall of the container, a cylindrical shape larger than the outer periphery of the container is created and attached to the container. The film is thermally shrunk by spraying and is adhered to the outer wall of the container.
[0004]
On the other hand, as the ink for shrink labels, solvent-based printing inks are used in the same manner as in the printing field for non-permeable plastic film bases mainly for soft packaging materials. Conversion to water-soluble printing ink has been proposed as one means for solving problems such as odor and danger of flammable explosion.
[0005]
However, water-soluble printing inks for shrink labels are rarely put into practical use. In particular, there are water-soluble printing inks that adhere to the most versatile but nonpolar polystyrene-based heat-shrinkable shrink film. I did not.
[0006]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide a water-soluble printing ink composition suitable for a shrink label attached to a synthetic resin container such as PET or a glass bottle, and a printed matter obtained by printing the same. Specifically, the present invention provides a printed matter coated with a water-soluble printing ink composition suitable for a polystyrene heat shrink shrink label. Moreover, the technique which melt | dissolves a film surface and improves the adhesiveness of an ink coating film and a film by coating the water-soluble printing ink composition containing 1-10 weight% of organic solvents is provided.
[0007]
[Means for Solving the Problems]
The present inventors have found a water-soluble printing ink composition having excellent adhesion between an ink film and a non-printing film and a printed material using the same, by using a component that dissolves a polystyrene-based resin such as a styrene-butadiene copolymer. Invented.
[0008]
That is, the first invention of the present invention is a heat-shrinkable shrink film of polystyrene resin, in which a water-soluble printing ink composition containing 1 to 10% by weight of N-methylpyrrolidone and / or terpene as an organic solvent is a printing film. The printed matter is characterized by being coated as a primer on at least one side .
[0009]
The second invention is the printed matter according to claim 1, wherein the film to be printed is a polystyrene resin heat-shrinkable shrink film of a container label .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the water-soluble printing ink composition of the present invention will be described.
The water-soluble printing ink composition of the present invention contains an organic solvent, water, and a binder as essential components in order to impart necessary properties as an ink.
[0014]
The amount of water contained in the water-soluble printing ink composition keeps the effect of cell reproducibility in the highlight area in gravure printing well, especially the cells in the gravure cylinder are clogged during long-time printing and the cell reproducibility is poor. Is preferably 30% by weight or more, and 80% by weight or less is preferable in order to avoid insufficient coloring density or brushing phenomenon during printing.
[0015]
Examples of the organic solvent used in the water-soluble printing ink composition include N-methylpyrrolidone, glycol ethers, esterified products of glycol ethers, terpenes, and the like, and these are used alone or in combination of two or more thereof.
[0016]
Examples of glycol ethers include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol monopropyl ether, ethylene glycol monoisopropyl ether, ethylene glycol dipropyl ether, ethylene glycol monobutyl ether, ethylene Ethylene glycol ethers such as glycol monoisobutyl ether, ethylene glycol dibutyl ether, ethylene glycol isoamyl ether, methoxyethoxyethanol, ethylene glycol monoallyl ether, ethylene glycol monophenyl ether; diethylene glycol monomethyl ether, diethylene glycol monoethyl ether Diethylene glycol ethers such as diethylene glycol isopropyl ether, diethylene glycol monobutyl ether, diethylene glycol monoisobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol monohexyl ether, diethylene glycol monobenzyl ether; triethylene glycol monoethyl ether, triethylene glycol monomethyl ether, Triethylene glycol ethers such as triethylene glycol monoisopropyl ether, triethylene glycol monobutyl ether, triethylene glycol dimethyl ether; propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene Propylene glycols such as recall monopropyl ether and propylene glycol monobutyl ether; dipropylene glycol such as dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monobutyl ether and dipropylene glycol dimethyl ether Ethers; including tripropylene glycol ethers such as tripropylene glycol monomethyl ether,
[0017]
In particular, ethylene glycol dimethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether and other diethylene glycol ethers; dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol dimethyl ether and the like Dipropylene glycol ethers are preferred.
[0018]
Examples of esterified glycol ethers include those obtained by acetating the above-mentioned glycol ethers. In particular, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl 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 are preferable.
[0019]
Terpenes include terpene hydrocarbons, terpene alcohols, terpene aldehydes, terpene ketones, terpene oxides, etc. Terpene hydrocarbons such as citronellol, geraniol, nerol, linalool, menthol, terpineol, carpeol, twill alcohol, pinocampheol, fentil alcohol, and porneol; citronellal Terpene aldehydes such as citral, cyclocitral, safranal, ferrandral, and perylaldehyde; Dageton, Yonon, Iron, Menton, Cal Menthone, Karubotanaseton, piperitenone, thujone, Charon, terpene ketones such as camphor; cineol, Pinole, terpene oxides, such as ascaridole are preferred.
[0020]
The amount of the organic solvent contained in the water-soluble printing ink composition is 1% by weight or more from the viewpoint of maintaining good adhesion of the ink coating film to the printing film, good drying property after printing, and winding From the viewpoint of preventing blocking, the content is preferably 10% by weight or less. In particular, 1.5 to 6% by weight is preferable.
[0021]
Further, the organic solvent component contained in the water-soluble printing ink composition remains in the printed film for a certain period after printing and is detected by gas chromatography analysis. For example, in the case of diethylene glycol diethyl ether, it is detected at a retention time of 14.3 minutes (GC7A manufactured by Shimadzu Corporation, conditions / column: OV17, INJ: 260 ° C., Col: 90 ° C. to 260 ° C., temperature increase: 8 ° C. / Min).
[0022]
As the binder used in the water-soluble printing ink composition, a water-soluble or water-dispersible resin, an intermediate hydrosol-type resin, and a colloid water purification resin synthesized using a water-soluble resin as a protective colloid are used alone or It can be used by mixing.
Specifically, it is synthesized from (meth) acrylic acid alkyl esters, other (meth) acryloyl group-containing monomers, styrene, α-methylstyrene, unsaturated carboxylic acids such as maleic acid and fumaric acid, or esters thereof ( A (meth) acrylic acid copolymer resin, a carboxyl group-containing petroleum resin, a cellulose resin, a styrene maleic acid resin, shellac, an aqueous polyester, an aqueous polyurethane and the like can be used alone or in combination.
[0023]
The water-soluble printing ink composition of the present invention comprises three components of an organic solvent, water and a binder, as well as various pigment dyes, aqueous printing plasticizers, dispersants, wetting agents, waxes, leveling agents, antifoaming agents, Adhesives, stabilizers, curing agents, cross-linking agents, preservatives, water-miscible organic solvents, etc. are appropriately added as necessary, and dispersion is performed using a kneader such as an attritor or a sand mill. Manufactured by adjusting the viscosity. The water-miscible organic solvent is a component mainly used for controlling the thickness and drying property of the ink coating film, and may be the same as the organic solvent that is an essential component of the water-soluble printing ink composition. It can be different.
Moreover, when a water-soluble printing ink composition does not contain a coloring component, the ink film formed by printing or coating this can be used as a primer or an overcoat.
[0024]
The water-soluble printing ink composition thus obtained has an appropriate viscosity using a solvent mixed with water or a water-miscible organic solvent such as ethyl alcohol, isopropyl alcohol, and normal propyl alcohol during printing. The printed matter of the present invention can be obtained by diluting until it is, printing on a film by gravure printing or flexographic printing, and drying.
The water-soluble printing ink composition of the present invention may be applied to both sides as well as one side of the printing film. The water-soluble printing ink composition is directly printed or coated on the surface of the printing film. The printed layer may be a single layer printed once or two or more layers printed twice or more.
[0025]
Examples of the film to be printed used in the printed material of the present invention include a polystyrene-based resin of a styrene butadiene copolymer, and particularly, a shrink film that is thermally contracted.
[0026]
The printed matter of the present invention is formed into a cylindrical shape larger than the outer periphery of the molded product to be mounted, and then covers the portion to be closely attached to the molded product, and is heated by a thermal tunnel, a thermal burner, steam spraying, etc. The printed material is shrunk by means and brought into close contact.
Examples of the molded product to which the printed material is mounted include a synthetic resin such as PET, a glass container, and a metal container.
[0027]
【Example】
EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited to this. In the examples, “part” represents “part by weight” and “%” represents “% by weight”.
[0028]
(Base primer preparation example 1)
A water-soluble acrylic resin (A) composed of acrylic acid, alkyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, and styrene was synthesized by a conventional method.
Base primer 1 was prepared from the following raw materials by a conventional method using a stirring pad.
Water-soluble acrylic resin (A) (solid content 30%) 91 parts Modified silicone antifoam (active ingredient 20%) 5 parts Water 4 parts
(Base ink preparation example 1)
Base ink 1 was prepared from the following raw materials by a conventional method using a sand mill.
[0030]
(Base ink preparation example 2)
Base ink 2 was prepared from the following raw materials by an ordinary method using an attritor.
[0031]
[Examples 1-2, Reference Examples 1-4, and Comparative Examples 1-5] To 100 parts of the obtained base primer and base ink, an organic solvent was added with the formulation shown in Table 1 while stirring. A water-soluble printing ink composition was obtained. This was diluted with a mixed solvent (water / ethanol / isopropanol = 20 parts / 70 parts / 10 parts) so that it would be 16 seconds (25 ° C.) with Zaan Cup # 3 (manufactured by Hosei Co., Ltd.), and a uniaxial polystyrene shrink film ( Gravure printing was performed at a drying temperature of 50 ° C. and a printing speed of 80 m / min using a gravure plate having a plate depth of 20 μm on CON Kasei Co., Ltd. BONSET: EPS45T) to obtain a printed film. The obtained printed matter was evaluated for blocking resistance and tape adhesion, and the results are shown in Table 1.
[0032]
(1) In the printed material immediately after blocking-resistant printing, the printed surface / non-printed surface and the printed surface / printed surface were superposed and allowed to stand under the following conditions, followed by a peeling operation.
Humidity 75%
Temperature 40 ℃
Load 5kg / cm ²
Time Judgment criteria for the 12-hour evaluation were as follows with respect to peeling resistance and set-off of the printed film. In practical use, it is 4 or more.
5: No peeling resistance and no print film show-through.
4: Although there is some peeling resistance, there is no show-through of the printed coating film.
3: There is peeling resistance and is slightly offset.
2: It is quite close and has been turned over.
1: Completely adhered and cannot be peeled off.
[0033]
(2) After leaving the adhesive printed material for one day, a cellophane tape was applied to the printed surface, and the appearance of the printed film when it was rapidly peeled off was visually determined. The evaluation criteria are as follows. In practical use, it is 4 or more.
5: The printed film was not peeled off at all.
4: More than 80% of the printed film remained on the film.
3: Less than 50 to 80% of the printed film remained on the film.
2: Less than 30 to 50% of the printed film remained on the film.
1: Less than 30% of the printed film remained on the film.
[0034]
[Table 1]
[0035]
【The invention's effect】
Since the water-soluble printing ink composition containing 1 to 10% by weight of the organic solvent of the present invention has good adhesion to the printing film, an excellent printed material can be obtained by coating it on the printing film surface. can get. Furthermore, high designability can be added to molded products such as glass bottles, PET bottles, and the like formed by mounting the printed material.

Claims (2)

A water-soluble printing ink composition containing 1 to 10% by weight of N-methylpyrrolidone and / or terpene as an organic solvent is applied as a primer on at least one surface of a heat-shrinkable shrink film of polystyrene resin as a printing film. Printed matter characterized by that. The printed material according to claim 1, wherein the film to be printed is a polystyrene resin heat-shrinkable shrink film for a container label.