JP2006002099A - Ink for plastic label, plastic label and labeled vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink for plastic labels that can develop high deodorizing effect, a label on which the ink has been used and a vessel labeled therewith. <P>SOLUTION: This ink for plastic labels includes a deodorizer in an amount of 0.1 to 10 wt.% to the total weight on the solid basis. This ink for plastic label may be an ink including a matting agent. This plastic label is coated with the ink for plastic labels stated above. The labeled vessel has this plastic label attached thereon. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plastic label ink containing a deodorant that hardly generates odor, a plastic label coated with the plastic label ink, and a container equipped with the label.

  As containers for beverages such as soft drinks and coffee drinks, plastic containers such as polyethylene terephthalate bottles (PET bottles) are used. The container may be provided with a plastic label such as a printed heat-shrinkable film (shrink label) on the side surface of the main body for decoration.

  For the production of the plastic label, a method by gravure printing is suitably used from the viewpoint of productivity and aesthetic appearance. However, a plastic label obtained by gravure printing has a problem that various odors are generated after printing, and particularly when such a label is attached to a beverage container, the commercial value is remarkably impaired. Such an odor is detected as, for example, a solvent odor caused by the gradual evaporation of solvents (residual solvent) contained in printing ink (gravure ink, etc.) from the printed matter, or a trace amount inherent in the resin contained in the printing ink. It is perceived as a peculiar irritating odor caused by the unreacted resin monomer.

  On the other hand, from the viewpoint of design properties, a label with suppressed surface gloss may be required. Such a label is coated with matte ink (matte ink) containing a matting agent, and silica particles are generally used as the matting agent. However, when a label printed with mat ink is mounted on a container, odor is generated from the surface of the label after mounting, which may impair the commercial value. Such labels may absorb surrounding odors, and may cause odors caused by constituent components such as resin monomers contained in the resin constituting the mat ink and residual solvents in the mat ink. However, there was a case where a bad reaction occurred due to a decomposition reaction on the surface of the label. When such a labeled container is stored in a sealed space such as a refrigerator or a warehouse, this problem may be particularly apparent.

  Japanese Patent Application Laid-Open No. 2002-212484 suppresses the generation of odor due to oxidation of animal and vegetable oils constituting the lithographic ink and generation of unique odor due to decomposition of the initiator contained in the photopolymerizable ink by adding a deodorant. A method is described. However, the above publication does not describe any problems of plastic label inks such as gravure inks that generally do not contain animal and vegetable oils or initiators.

JP 2002-212484 A

An object of the present invention is to provide a plastic label ink capable of exhibiting a high deodorizing effect, a plastic label using the ink, and a labeled container.
Another object of the present invention is to provide an ink for plastic labels that has excellent matting properties and can remarkably suppress the generation of bad odor caused by adsorbed odor, a plastic label using the ink, and a container with a label. It is in.

  As a result of intensive studies to achieve the above-mentioned object, the present inventors masked the odor generated by the label or applied the ink for plastic label containing a specific amount of deodorant, or significantly generated the odor. The inventors found that it can be suppressed and completed the present invention.

  That is, the present invention provides a plastic label ink characterized by containing a deodorant in an amount of 0.1 to 10% by weight based on the total solid content. The ink for plastic labels of the present invention may be an ink containing a matting agent.

  The present invention also provides a plastic label coated with the plastic label ink of the present invention.

  Furthermore, the present invention provides a labeled container equipped with the plastic label of the present invention.

  In the present specification, “ink” is used to mean a coating agent that does not contain a colorant such as a pigment.

  According to the plastic label ink of the present invention, it is possible to mask odor caused by residual solvent or the like or to suppress the generation of odor. In particular, even if the plastic label ink is a matte ink containing a matting agent that easily adsorbs the surrounding odor, the generation of bad odor can be significantly reduced due to the excellent deodorizing effect. Labels coated with such ink do not cause misrecognition or discomfort in the contents even when attached to containers, and are suitable for use in beverages and food containers such as water, tea, and coffee. it can.

  Embodiments of the present invention will be described below with reference to the drawings as necessary. FIG. 1 is a schematic sectional view showing an example of the plastic label of the present invention. The plastic label 1 includes a printing layer 4, a base material 2, and a coating layer 3.

  The plastic label 1 of the present invention only needs to be a plastic film as the substrate 2, and is a stretch label, a shrink label, a stretch shrink label, an in-mold label, a tack label, a roll label (a wrap-type glued label), a heat-sensitive adhesive label. Any of these may be used.

  Examples of the base material 2 include polyester films made of polyethylene terephthalate, styrene resin films made of styrene-butadiene block copolymers, olefin resin films such as polypropylene, and plastic films such as vinyl chloride resin films. . The substrate can be formed of one or more materials, and may be a single layer or a multilayer, and may be an unstretched film, a uniaxially stretched film or a biaxially stretched film. When the plastic label is a shrink label, as a preferred substrate, a heat-shrinkable single-layer or multi-layer styrene resin film having a shrinkage ratio of 50% or more in one direction, a polyester film, a cyclic polyolefin film, and the above A film in which a nonwoven fabric or a foamed resin sheet is laminated on a film is used.

  The surface of the substrate 2 on the printed layer 4 side may be subjected to conventional surface treatment such as corona discharge treatment or plasma treatment in order to improve printability. Moreover, you may add various additives, such as a filler, a heat stabilizer, antioxidant, a ultraviolet absorber, an antistatic agent, a flame retardant, and a coloring agent, to the base material 2 as needed. The thickness of the base material 2 can be selected within a range that does not impair the handleability, workability, etc. when it is used as a label, and is preferably 10 to 200 μm. In the case of a shrink label, for example, 20 to 80 μm, preferably about 30 to 60 μm. is there.

  The main feature of the plastic label 1 of the present invention is that the coating layer 3 is formed of a plastic label ink containing 0.1 to 10% by weight of a deodorant with respect to the total solid content. Deodorants include a wide range of substances that can exert a deodorizing function by chemical action such as chemical adsorption or chemical reaction, physical action such as physical adsorption, physicochemical action, biochemical action such as enzyme reaction, etc. Is included. As such a deodorant, for example, an adsorptive substance that adsorbs and removes odors, a decomposable substance that decomposes and removes odors, and an aroma that masks bad odors with aroma components and suppresses the generation of odors Substances can be used. Of these, adsorptive substances and decomposable substances are preferable, and these and flavoring substances can be used in combination. Moreover, it is also preferable to use the fragrance | flavor substance which emits the same or similar fragrance as the contents of the container which mounts a label. In addition, even if the deodorizer in the present invention has a deodorizing function, those having properties such as gelation immediately after mixing with the constituent components of the ink are not suitable because the applicability of the ink is significantly impaired. .

  Specific examples of the deodorant include porous particles such as fine particle titanium oxide, zeolite, activated carbon and alumina (excluding silica); polyaldehydes such as 1,2-ethanediar (glyoxal); inclusion of cyclodextrin and the like Compounds; flavonoids and glycosides thereof; organosilicon compounds such as alkyl silicates and organosilane compounds; phosphates such as aluminum dihydrogen triphosphate; glycosaminoglycans such as chitin and chitosan; catechins and tannins Extracts from plants; Ascorbic acid chelating compounds such as iron-ascorbic acid chelating compounds; Metal hydroxides such as hydroxides of zirconium and lanthanoids; Decomposition of aldehydes such as aldehyde dehydrogenase, GD-FDH and SNP Enzymes; menthol, li Nene, linalool, d-citronellal, geraniol, terpenes such as nerol; and other deodorant materials.

  Examples of the deodorant described above are “Glyoxal” manufactured by Daicel Chemical Industries, Ltd. as 1,2-ethanediar, “Seldex CH-20”, “Seldex CH-30” manufactured by Nippon Food Processing Co., Ltd. as cyclodextrins. ”,“ Seldex CH-30H ”,“ Fresh Lymatsu ”manufactured by Shiraimatsu Shinyaku Co., Ltd. as a flavonoid,“ CLG-520 ”manufactured by Kyoeisha Chemical Co., Ltd. as methyl silicate contained in alkyl silicate, aluminum dihydrogen tripolyphosphate "K-FRESH # 100P", "MZO", "ZA", "Z", "ZC" manufactured by Teika Co., Ltd., and "ST-01", "SX-" manufactured by Ishihara Sangyo Co., Ltd. T1 "etc. are commercially available.

  Examples of the other deodorizing substances include “Zeon Clean ZCL-3040”, “ZCL-1010A”, “ZCL-9050”, “ZCL-9051” manufactured by Nippon Zeon Co., Ltd., and “Epolion 1MP” manufactured by Aiko Co., Ltd. , “HP”, “NZ”, “VN-65”, “Deolet” manufactured by Meiji Yakuhin Kogyo Co., Ltd., Acryase manufactured by Shinto Chemical Co., Ltd., “Purier” manufactured by Matsushita Electric Works, Ltd., “Super Pew” Commercial products such as “Riere”, “Shoe Cleanse” manufactured by Rasa Kogyo Co., Ltd., “Mizukanite” manufactured by Mizusawa Chemical Co., Ltd., and “Diamsh” manufactured by Oshika Promotion Co., Ltd. can be used. These deodorants can be used alone or in combination of two or more.

  Among them, extracts from plants, ascorbic acid chelate compounds, and deodorants other than metal hydroxides, that is, porous particles (excluding silica), polyaldehydes, inclusion compounds, flavonoids and their glycosides Body, organosilicon compounds, phosphates, glycosaminoglycans, aldehyde-degrading enzymes and terpenes are preferred. In particular, porous particles are preferable in that they absorb odor and are difficult to desorb, and fine particle titanium oxide (for example, trade name “ST-01” manufactured by Ishihara Sangyo Co., Ltd.) is more preferable. According to these deodorizers, since the reaction between the adsorbed odor and the residual solvent can be avoided, the generation of bad odor is remarkably reduced or suppressed, and an excellent deodorizing effect can be obtained. In addition, an aldehyde-degrading enzyme is preferably used because it can decompose an aldehyde compound that causes malodor.

  The shape of the deodorant is not particularly limited as long as the deodorant property and dispersibility are not impaired, and may be any of particulate, oval, columnar, and powder. Of these, particles are preferable from the viewpoints of handleability and compatibility or dispersibility, and those having a particle diameter of, for example, 30 μm or less (preferably about 0.5 to 25 μm, more preferably about 1 to 20 μm) are preferable. Used. In addition, the deodorant exemplified above can be used in a form encapsulated in microcapsules. In this case, since the deodorizing effect is exerted by destroying the microcapsules with heat or the like, the use time of the deodorant can be adjusted, for example, deodorizing simultaneously with heating when attaching the label to the container Can be obtained, and a continuous deodorizing effect can be obtained.

  The content of the deodorant is about 0.1 to 10% by weight, preferably about 0.5 to 8% by weight, based on the total solid content of the ink. If the content of the deodorant is less than 0.1% by weight, the deodorant cannot be fully exerted, and even if the content exceeds 10% by weight, the effect of improving the deodorant is not obtained. It is economical and not preferred.

  The ink for plastic labels of the present invention usually contains a resin. The resin is not particularly limited as long as it can be dissolved or dispersed in a solvent. For example, a thermoplastic resin such as polyester, polyvinyl chloride, polyvinyl acetate, cellulose resin, acrylic resin, or urethane resin is used. It can be used alone or in combination of two or more. For example, acrylic resins and urethane resins are preferably used as the resin constituting the shrink label ink. In particular, acrylic resins are preferably used because they are excellent in blocking resistance, have little residual organic solvent after drying, and have little solvent odor. Further, when the ink is a matte ink containing a matting agent, the use of an acrylic resin improves the scratch resistance. In particular, an acrylic resin having a glass transition temperature (Tg) of 60 ° C. or higher (for example, 60 to 180 ° C., preferably 70 to 150 ° C.) is preferable in terms of excellent heat resistance and slipperiness. Examples of the acrylic resin having a glass transition temperature of 60 ° C. or higher include trade names “Dianar GR5508” (Tg 75 ° C.) and “Dianar GR 5539” (Tg 150 ° C.) manufactured by Mitsubishi Rayon Co., Ltd.

  The amount of the resin can be appropriately selected within a range not impairing the characteristics of the present invention, and is, for example, 5 to 70% by weight, preferably 5 to 65% by weight, based on the total solid content of the ink. If the amount of the resin is less than 5% by weight, scratch resistance tends to be lowered, and if it exceeds 70% by weight, blocking is likely to occur.

  When an acrylic resin is used as the resin, the molecular weight of the acrylic resin can be appropriately selected within a range that does not impair the characteristics of the present invention, and is, for example, about 10,000 to 100,000, preferably about 20,000 to 80,000. The acrylic resin may contain a hydroxyl group, a carboxyl group, or the like.

  The plastic label ink may contain a matting agent. According to the plastic label ink (matte ink) containing the matting agent, the matte property can be imparted to the label. As the matting agent, silica particles are generally used. Since the silica particles easily adsorb odors and the adsorbed odors are easily desorbed, there is a problem that ink containing a matting agent is particularly likely to generate bad odors. In contrast, according to the plastic label ink of the present invention, since it contains a deodorant, it exerts the above-described deodorizing effect on the odor desorbed from the silica particles, thereby reducing the odor released from the label surface. It can be significantly reduced or suppressed. For this reason, it is not necessary to use expensive surface-treated silica as the silica particles contained in the plastic label ink, although there is an odor reducing effect, and it is possible to obtain a high deodorizing effect at low cost.

  The particle diameter of the silica particles used in the mat ink is not particularly limited, but is preferably 30 μm or less (preferably about 0.5 to 25 μm, more preferably about 1 to 20 μm) from the viewpoint of compatibility or dispersibility. . The content of silica particles is 1 to 50% by weight, preferably 10 to 40% by weight, based on the total solid content of the ink. When the content is less than 1% by weight, the specular gloss becomes high and the matting effect tends to be insufficient, and when it exceeds 50% by weight, the scratch resistance (scratch resistance) is lowered, and gloss is likely to return during transportation. Therefore, it is not preferable.

  The plastic label ink is within the range that does not impair the above characteristics, and further includes lubricants (particulate solid substances such as fluororesins, waxes, silicone oils, etc.), antisettling agents (amide type antisettling agents, etc.), and dispersion stabilizers. (Surfactant etc.), extenders, various colorants, fillers, antioxidants, ultraviolet absorbers, antistatic agents and other additives may be included.

  The ink for plastic labels is prepared by dissolving or dispersing the above components (deodorant, resin, lubricant, additive, etc.) in a solvent. As the solvent, for example, an organic solvent having low toxicity, for example, acetates such as ethyl acetate and n-propyl acetate, and alcohols such as methanol, ethanol and isopropyl alcohol can be preferably used. As the organic solvent, it is not necessary to use a highly toxic solvent, for example, ketones such as methyl ethyl ketone and methyl isobutyl ketone, and aromatic hydrocarbons such as toluene.

  The coating layer 3 can be formed by applying the plastic label ink having the above structure to the substrate and then removing the organic solvent by drying. In particular, when the plastic label ink is gravure printing ink or flexographic printing ink, the organic solvent may remain in the coating layer 3. In addition, the coating layer 3 may contain a resin monomer contained in a constituent resin. Such residual solvents and resin monomers not only cause odors by themselves, but also react with surrounding odor components, odor components adsorbed on the label surface, and component components of the label, resulting in bad odors. It becomes a factor to generate and generate. In this invention, since the plastic label ink which consists of the said structure is used, the outstanding deodorizing effect is exhibited and generation | occurrence | production of an odor can be reduced or suppressed remarkably.

  The thickness of the coating layer 3 can be appropriately selected within a range in which the above characteristics can be exhibited, and is, for example, 0.5 to 5 μm, preferably 1 to 3 μm. The coating layer 3 is preferably transparent.

  For example, the coating layer 3 can be provided with a plastic label ink by a method such as gravure printing on the surface of a plastic film (base material 2) that has been subjected to stretching treatment as necessary.

  The printing layer 4 can be provided on the surface of the base 2 that is in contact with the adherend by a conventional printing method such as gravure printing. In addition, the printing layer 4 should just be provided in the at least one surface of the base material 2, For example, the interlayer of the base material 2 and the coating layer 3 may be sufficient.

  In addition, the plastic label of this invention should just have the coating layer 3 formed in the surface (outer surface side) side which is not in contact with the to-be-adhered body of the base material 2, and the printing layer 4 is the base material 2 and the coating layer 3. The structure provided between the layers may be used. Moreover, the plastic label of this invention may have another layer. As other layers, for example, a colorless transparent resin layer on the outer surface side of the coating layer, a white layer on the inner surface side of the printing layer, a surface on the side (inner surface side) that contacts the adherend of the substrate 2, Between each layer, an anchor coat layer, a primer coat layer, an adhesive layer, an adhesive resin layer, and the like can be provided, and layers such as a nonwoven fabric, paper, and plastic can be laminated.

  FIG. 2 is a schematic sectional view showing another example of the plastic label of the present invention. This plastic label 1 'has a configuration in which a printing layer 4, a substrate 2, a mat ink layer 5 and a coating layer 3' are laminated in this order. The printing layer 4 and the base material 2 can be the same as described above. The coating layer 3 'can be formed of a plastic label ink containing a deodorant in an amount of 0.1 to 10% by weight based on the total solid content, and the mat ink layer 5 is formed of a mat ink containing at least a resin and a matting agent. can do. As the deodorant, the resin and the matting agent, those exemplified as the constituent components of the plastic label ink can be used. The plastic label 1 ′ is provided with a coating layer 3 ′ on the outer surface side of the mat ink layer 5, so that it has an excellent matting property and is used as a matting agent or residual solvent contained in the mat ink layer 5. Generation | occurrence | production of the odor resulting from it can be reduced and suppressed and the outstanding deodorizing effect can be exhibited.

  The plastic labels 1, 1 'obtained by the above method are used after being processed into a desired shape according to the purpose. For example, when the plastic label 1 is a shrink label, the coating layer 3 is on the outer side, and the base 2 is rounded into a cylindrical shape so that the main stretching direction (usually the width direction) is the circumferential direction, and both ends are It is possible to obtain a cylindrical shrink label by bonding with a solvent or the like to form a continuous tubular shrink label continuous body and cutting into each label. In addition, in order to obtain favorable adhesiveness, it is preferable that a coating layer, a printing layer, or the like is not provided on the bonding portion. The coating agent need not be on the entire label surface. It is applied to the desired part according to the design of the label.

  In the labeled container of the present invention, for example, the plastic label 1 is mounted on the container 6 as shown in FIG. The material of the container 6 is not particularly limited, and may be any of a plastic container made of polyester such as polyethylene terephthalate, a glass container, and a metal container. The shape of the container 6 may be any of a polygon such as a substantially quadrangular cross section and a cylindrical shape having a circular cross section.

  The container with a label of the present invention supplies, for example, a cylindrical plastic label (shrink label) 1 having an outer surface on the coating layer 3 side to an automatic label mounting device, cuts it to a required length, It can be manufactured by being externally fitted to the filled container 6 and passing through a hot air tunnel or steam tunnel at a predetermined temperature, or by heat shrinkage by heating with radiant heat such as infrared rays.

  In the present invention, even when a steam tunnel is used at the time of heat shrinkage, odor adsorption caused by contact with water vapor and generation of malodor produced by reaction between the adsorbed odor and the components constituting the label are suppressed. can do. This is particularly effective when the shrinkage rate when mounted on a container is high (for example, when shrinkage of 20% or more is required) because the above-mentioned problem is likely to occur. In addition, since a high deodorizing effect can be exhibited continuously, a sense of incongruity due to a strange odor does not occur when the labeled container is transported or after long-term storage. For this reason, the misidentification of the quality of the container contents can be avoided, and it can be widely used as a container for beverages or foods.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

Example 1
Dainippon Ink & Co., Ltd. "Fine Wrap OPS Matte Medium R" [containing acrylic resin and silica particles] 95 parts by weight, cyclodextrin as a deodorant [Nippon Food Industry Co., Ltd., trade name "Seldex CH- 20 "] 5 parts by weight were added and stirred to prepare a gravure ink.
This ink is applied to one surface of a polystyrene film [Gunze Co., Ltd., trade name “GMAS”; film thickness 50 μm] by gravure printing so that the thickness becomes 0.5 to 2 μm, and then a coating layer A shrink label was obtained.
The obtained shrink label was rounded into a cylindrical shape so that the width direction of the base film would be the circumferential direction, and both ends were welded by heat to obtain a long tubular shrink label continuous body. The shrink label continuum is supplied to an automatic label mounting device, cut into individual labels, and then covered with a hot-filled coffee (temperature 85 ° C.) cross-section square shape, covered with a 500 ml PET bottle and steam tunnel (temperature 90 ° C.) and then heat-shrinked to produce the labeled container shown in FIG.

Examples 2-14
In Example 1, gravure ink (plastic label ink) was prepared in the same manner as in Example 1 except that 5 parts by weight of each deodorant shown in Table 1 below was used instead of cyclodextrin as the deodorant. )
Using this ink, a shrink label was obtained by the same operation as in Example 1.
A labeled container was produced by the same operation as in Example 1 using the obtained label.

Comparative Example 1
In Example 1, gravure ink (ink for plastic labels) was obtained by performing the same operation as in Example 1 except that no deodorant was added.
Using this ink, a shrink label was obtained by the same operation as in Example 1.
A labeled container was produced by the same operation as in Example 1 using the obtained label.

(Evaluation test)
Deodorizing properties After a 50 cm × 50 cm test piece obtained by cutting the labels obtained in Examples and Comparative Examples was placed in a 200 cc glass container with a lid, and opened after 12 hours, the test piece was taken out. , Sensually test for residual odor in the container, "◎" if no odor is felt, "○" if only the odor of the deodorant is felt, if a little odor remains Was evaluated as “C”, and a case where an unpleasant odor or bad odor was felt was evaluated as “X”. These results are shown in Table 2.

It is a schematic sectional drawing which shows an example of the plastic label of this invention. It is a schematic sectional drawing which shows the other example of the plastic label of this invention. It is a perspective view which shows an example of the labeled container of this invention.

Explanation of symbols

1, 1 'plastic label 2 base material 3, 3' coating layer 4 printing layer 5 mat ink layer 6 container

Claims (4)

  A plastic label ink comprising 0.1 to 10% by weight of a deodorant based on the total amount of solids.   The plastic label ink according to claim 1, further comprising a matting agent.   A plastic label to which the plastic label ink according to claim 1 or 2 is applied.   A labeled container to which the plastic label according to claim 3 is attached.

Images