JP4846993B2 - Plastic labels and labeled containers - Google Patents

Description

  The present invention relates to a plastic label having a matte surface and a container with a label, which are less likely to generate odor during use or storage.

  As a container for beverages such as soft drinks and coffee beverages, a plastic label such as a film (shrink label) having heat shrinkability printed on the side surface of a plastic container body such as a polyethylene terephthalate bottle (PET bottle). The attached container is used.

  Various functions can be imparted to the plastic label as described above by forming a coating layer on the surface (outer surface side) of the label that does not contact the container. For example, the slipperiness can be improved by forming a coating layer containing wax.

  Moreover, the label which suppressed surface gloss may be calculated | required from a viewpoint of design property. Such a label can be obtained by coating the surface on the outer surface side of the label with a matting composition (matt varnish) containing a matting agent. The mat varnish generally contains silica particles as a matting agent, and the silica particles diffusely reflect incident light on the label surface, so that the appearance can be suppressed.

  However, the plastic label coated with the matt varnish as described above has unevenness due to the matting agent (silica particles, etc.) on the surface of the coating layer, and therefore has a scratch resistance (abrasion resistance) and a slipping property between the coating layers. Poorly, for example, a container such as a PET bottle equipped with the label has a phenomenon that the label surface is rubbed due to contact between adjacent containers during transportation, and the rubbed part loses the matte effect and becomes transparent (glossy return). There were problems such as occurrence or tearing.

  Japanese Patent Application Laid-Open No. 2002-327149 describes that a certain slip property can be imparted to the coating agent by adding a fluororesin powder in an amount of 0.5 to 30% by weight based on the total solid content. However, since a plastic label using such a coating agent is powdered with a fluororesin powder on the production line, there is a problem that the appearance may be deteriorated or the product adheres to the production facility. In particular, when coating a mat varnish containing a large amount of silica particles as a matting agent, the above-described adverse effects are remarkable.

  In addition, when a shrink label is used as a label coated with matt varnish, and the label is shrunk with high-temperature steam and attached to a container, odor is generated from the surface of the label after attachment, and the commercial value may be impaired. . Such a label may absorb surrounding odors, and this problem may be manifested particularly when stored in a closed space such as a refrigerator or a warehouse.

JP 2002-327149 A

An object of the present invention is to provide a plastic label and a container with a label that have excellent matting properties and are less likely to generate odor.
Another object of the present invention is to provide a plastic label and a container with a label that are excellent in slipperiness and scratch resistance and can suppress the adsorption and generation of odors during use and storage.

  As a result of intensive studies to achieve the above object, the present inventors have found that, by using silica particles that have been subjected to surface treatment, it is possible to impart a matte design to the label and to remarkably suppress the generation of odor. As a result, the present invention has been completed.

That is, the present invention is a shrink label in which a coating layer is formed on at least the surface of the heat-shrinkable plastic film substrate that does not contact the adherend, and the coating layer has a glass transition temperature of 60 ° C. as a resin. 10-40% by weight of surface-treated silica containing the above acrylic resin and having a coating layer made of polyolefin of 10% by weight or more based on silica particles on the surface of the silica particles , and There is provided a shrink label containing at least one of fluororesin powder and oxidized polyethylene wax as a lubricant and silicone oil .

The present invention provides a labeled container equipped with the plastic label of the present invention. In the present specification, in addition to the above-described invention, a plastic label in which a coating layer is formed on at least the surface of the substrate that does not contact the adherend, and the coating layer is formed on the surface of the silica particles. A plastic label containing 1 to 50% by weight of surface-treated silica provided with a coating layer of 10% by weight or more based on silica particles will also be described.

  The plastic label of the present invention has excellent matte properties, and when storing or using a container equipped with the label, it can prevent the generation of off-flavors and prevent the generation of off-flavors. Misidentification or discomfort does not occur and can be suitably used for beverage containers such as water, tea, and coffee.

  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 is laminated on a polyester 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 contains 1 to 50% by weight of surface-treated silica in which a coating layer of 10% by weight or more with respect to the silica particles is provided on the surface of the silica particles. There is in point. In general, the coating layer 3 to which a matting agent is added is used to impart matting properties to the label, and silica particles are widely used as the matting agent. On the other hand, in the present invention, since the surface-treated silica obtained by subjecting the silica particles to surface treatment is used as such a matting agent, it can impart excellent matting properties and effectively absorb and generate odors. Can be suppressed.

The coating layer 3 contains surface-treated silica and a resin. The surface-treated silica has a coat layer on the surface of silica particles. The silica particles (silica before providing the coating layer) are not particularly limited. The particle diameter of the silica particles 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 coat layer can be composed of, for example, an inorganic material, an organic material, or a combination thereof. Examples of the inorganic substance include magnesium silicofluoride (MgSiF ₆ ). Moreover, as organic substance, resin, such as polyolefin, such as polyethylene and a polypropylene, etc. are mentioned, for example. Of these, a coating layer made of an organic material is preferably used in terms of improving slipperiness. The coating layer can be formed by a conventional method. The surface-treated silica may be used alone or in combination of two or more.

  The ratio of the coat layer (amount of surface treatment) is 10% by weight or more based on the silica particles. If the ratio of the coat layer is less than 10% by weight, the friction coefficient is too high or the scratch resistance is lowered. In addition, the ratio of a coat layer can be calculated | required by the ignition loss method. That is, for the surface-treated silica, the mass reduction rate after heating at a temperature of 105 ° C. for 2 hours and the mass reduction rate after heating at a temperature of 900 ° C. for 30 minutes are measured, The ratio of layers can be calculated.

  The amount of the surface-treated silica is 1 to 50% by weight, preferably 10 to 40% by weight, based on the coating layer 3. When the amount of the surface-treated silica is less than 1% by weight, the specular gloss becomes high and the matte effect tends to be insufficient, and when it exceeds 50% by weight, the scratch resistance is lowered, and gloss is likely to return during transportation. Absent.

  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. Among these, acrylic resins are preferably used because they are excellent in blocking resistance and scratch resistance, have little residual organic solvent after drying, and have little solvent odor. In particular, an acrylic resin having a glass transition temperature (Tg) of 60 ° C. or higher (for example, 60 to 180 ° C.) is preferable in that it has 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 with respect to the coating layer. If the amount of the resin is less than 5% by weight, blocking is likely to occur, and if it exceeds 70% by weight, the scratch resistance is likely to be lowered.

  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 coating layer may contain various lubricants in order to improve slipperiness. The lubricant is not particularly limited and may be either an organic lubricant or an inorganic lubricant, and examples thereof include particulate solid substances such as inorganic particles and organic particles, liquid components such as wax and silicone oil, and the like. . As the lubricant in the present invention, a lubricant that does not easily generate odor and that does not easily generate bad odor due to reaction with other components constituting the coating layer is particularly suitable. These lubricants can be used alone or in admixture of two or more. In the present invention, from the viewpoint of heat resistance imparted to the coating layer 3, a lubricant having a melting point of 90 ° C. or higher and silicone oil are preferable. Among these, organic particles, synthetic waxes, and silicone oils are preferable. In particular, it is preferable to use silicone oil in combination with at least one of fluororesin powder and oxidized polyethylene wax.

  Particulate solid materials include silica (excluding surface-treated silica provided with a coating layer), talc, mica, kaolin, bentonite, clay, graphite, fluorinated graphite, carbon black, titanium oxide, zinc oxide, magnesium oxide , Boron nitride, molybdenum disulfide, tungsten disulfide, calcium carbonate, calcium sulfate, calcium titanate, calcium phosphate, calcium hydroxide, aluminum hydroxide, magnesium hydroxide, glass powder, alumina, metal powder, etc .; stearyl alcohol Higher fatty acids such as stearic acid, higher fatty acid esters such as butyl stearate, fatty acid and polyhydric alcohol partial esters such as glycerin fatty acid ester, higher fatty acid amides such as stearic acid amide and ethylenebisstearyl amide, Higher fatty acid salts (metal soap) such as barium allate, calcium stearate, zinc stearate, aluminum stearate, magnesium stearate, fluororesin, polyacetal, poly (meth) acrylic acid metal salt, polyacrylonitrile, polyacrylamide , Organic particles such as melamine resin, phenol resin, starch powder and cellulose powder.

  The fluororesin may be a resin containing at least a fluorine atom-containing monomer as a monomer component. For example, polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF) ), Polyvinyl fluoride (PVF), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether (Co) polymer comprising one or more fluorine atom-containing monomers such as copolymer (EPE); tetrafluoroethylene-ethylene copolymer (ETFE), chlorotrifluoroethylene-ethylene Such as Ren copolymer (ECTFE) 1 or more kinds of fluorine-containing monomer and other copolymerizable monomers, and a copolymer of, and the like.

  The wax includes mineral wax such as microcrystalline wax, oxidized microcrystalline wax, paraffin, oxidized paraffin, and montan wax; polyethylene wax, polypropylene wax, oxidized polyethylene wax, oxidized polypropylene wax, chlorinated polyethylene wax, chlorinated polypropylene. Synthetic wax such as wax, ethylene-acrylic acid copolymer wax, ethylene-vinyl acetate copolymer wax, polycarbonate wax; lacquer wax, beeswax, white wax, wood wax, whale wax, petrolatum, lanolin, carnauba wax, cane wax , Natural waxes such as candelilla wax, shellac wax, rice wax, sugar wax and the like. The lubricants can be used alone or in admixture of two or more.

  The oxidized polyethylene wax may be any wax that is obtained by oxidizing polyethylene and introducing a polar group such as a carboxyl group, and includes, for example, oxidized polyethylene wax and composite wax of oxidized polyethylene and other materials. It is done. In general, an oxidized polyethylene wax having an acid value of about 1 to 30 mg-KOH / g is used.

  The silicone oil is not particularly limited, and conventional silicone oil can be used, and modified silicone oil into which various functional groups are introduced can also be used. Examples of functional groups include amino groups, amide groups, epoxy groups, carboxyl groups, hydroxyl groups, fluorine atoms, higher fatty acids and the like. In particular, when modified silicone oil is used, good orientation and compatibility with the resin contained in the coating layer is exerted by the action of functional groups in the molecule, and the resin does not swell, resulting in a decrease in coating strength, etc. Can be imparted with excellent blocking resistance and slipperiness. The silicone oil may have either a low viscosity or a high viscosity as long as the compatibility and dispersibility with the resin contained in the coating layer is good, and it may be in any form of a semi-solid or a solid. Good.

  When a coating layer is formed by applying a composition using a particulate solid material such as a fluororesin as a lubricant by gravure printing, the average particle size of the lubricant is 30 μm or less (preferably 3 to 25 μm, more preferably It is preferably about 5 to 20 μm.

  The amount of the lubricant can be appropriately selected within a range not impairing the above characteristics, and is, for example, about 0.1 to 30% by weight, preferably about 0.1 to 20% by weight with respect to the coating layer. In addition, when used in combination with silicone oil and at least one of fluororesin powder and polyethylene oxide wax as a lubricant, the amount of lubricant used was reduced to 10% by weight or less (about 0.1 to 10% by weight). Even in this case, slipperiness is not impaired, powdering can be prevented, and blocking resistance is particularly good. Silicone oil is not an essential component and can be used in an appropriate amount as long as the characteristics of the present invention are not impaired. However, for example, 0.1 to 10% by weight, preferably about 0.1 to 7% by weight, based on the coating layer. Used in If it is less than 0.1% by weight, the effect of adding silicone oil is insufficient, and if it exceeds 10% by weight, the orientation and compatibility are lowered, and the adhesion to the film constituting the substrate 2 is lowered.

  In addition to the above, the coating layer includes an anti-settling agent (such as an amide anti-settling agent), a dispersion stabilizer (such as a surfactant), an extender, various colorants, a filler, an antioxidant, an ultraviolet absorber, An additive such as an antistatic agent may be contained.

  The coating layer is prepared by dissolving or dispersing the above components (surface-treated silica, 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 organic solvent can be removed by drying after applying the composition for forming the coating layer to the substrate.

  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 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.

  Since the plastic label of the present invention has the above-described configuration, it has excellent matting properties. For example, on the surface of the coating layer 3 of the label, the specular glossiness at an angle of 60 ° according to JIS K 5600-4-7 is 50 or less. When the specular gloss exceeds 50, the matte property is insufficient, which is not preferable. The specular glossiness can be adjusted by appropriately selecting the type and amount of the constituent components of the coating layer 3 (particularly, the surface-treated silica as a matting agent).

  The plastic label of the present invention also has good slipperiness. For example, the coefficient of friction of the outer surface of the label on the coating layer 3 side is 0.5 or less (for example, 0.1 to 0.5) with respect to the outer surface of the similar plastic label on the coating layer side. That is, the coefficient of friction between the outer surfaces of the plastic labels of the present invention is, for example, 0.5 or less. In particular, when the plastic label 1 is a shrink label, it is preferably 0.45 or less. When the coefficient of friction exceeds 0.5, when the containers equipped with the plastic labels are transported, the adjacent containers come into contact with each other and the label surfaces rub against each other, causing the gloss to return or the labels to be easily broken. Further, since the slipperiness of the container with the label is lowered, it is difficult for the container with the label to pass or fall through a predetermined passage when the container is loaded or taken out, or the adjacent containers do not slip. There is a risk of clogging. In addition, it is preferable that this friction coefficient is 0.5 or less also at the time of a heating (50-90 degreeC).

  For the same reason as described above, the plastic label 1 preferably has a coefficient of friction of the outer surface on the coating layer 3 side of, for example, 0.5 or less (for example, 0.2 to 0.5) with respect to the stainless steel plate. . In particular, when the plastic label 1 is a shrink label, it is preferably 0.45 or less. In addition, it is preferable that this friction coefficient is 0.5 or less also at the time of a heating (50-90 degreeC).

  In the present invention, a dynamic friction coefficient and a static friction coefficient can be employed as the friction coefficient on the coating layer surface of the plastic label. That is, it is preferable that both the static friction coefficient and the dynamic friction coefficient with respect to the outer surface similar to the plastic label are 0.5 or less. Moreover, it is preferable that both the static friction coefficient and the dynamic friction coefficient with respect to a stainless steel plate are 0.5 or less.

  In addition, the static friction coefficient and dynamic friction coefficient in this invention can be measured based on JISK7125. The coefficient of friction can be adjusted by appropriately selecting the type and amount of components (resin, surface-treated silica, lubricant, etc.) of the coating layer.

  In the plastic label 1 of the present invention, for example, a composition for forming a coating layer is applied to the surface of a plastic film (base material 2) that has been subjected to stretching treatment as necessary, by a method such as printing such as gravure printing. Can be manufactured.

  The plastic label 1 obtained by the above method is processed into a desired shape and used 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 the coating layer is not provided in the adhesion part. 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 5 as shown in FIG. The material of the container 5 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 5 may be any of a polygonal shape such as a substantially rectangular 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 5 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 particular, in the present invention, even when a steam tunnel is used at the time of heat shrinkage, the bad smell generated by the adsorption of the odor caused by the vapor coming into contact with the label and the reaction between the adsorbed odor and the component constituting the label. Can be suppressed. For this reason, the misidentification of the quality of the container contents can be avoided, and it can be widely used as a beverage container.

  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
Ethyl acetate / isopropyl alcohol mixed solution of acrylic resin [trade name “Dyanar GR5508”, manufactured by Mitsubishi Rayon Co., Ltd .: glass transition temperature 75 ° C., molecular weight 20000, solid content 55% by weight, acid value 0 mg KOH / g (solid) ] 35 parts by weight, surface-treated silica (trade name “NIPGEL AZ-260”, manufactured by Tosoh Silica Co., Ltd .; average particle diameter of 1.9 μm, forming 12% by weight of polyolefin coating layer on silica particles) Parts, oxidized polyethylene wax (trade name “Ceridust 3719”, manufactured by Clariant Japan Co., Ltd .; average particle size 9.0 μm), silicone oil (trade name “KF-96-100cs”, manufactured by Shin-Etsu Silicone Co., Ltd.) ) 0.5 parts by weight and 54.5 parts by weight of ethyl acetate are mixed to form a coating agent (total amount of solids (coating And 65% by weight of an acrylic resin, about 17% by weight of surface-treated silica, about 17% by weight of oxidized polyethylene wax, and about 1.7% by weight of silicone oil). .
This coating agent is applied to one surface of a heat-shrinkable polyester film [thickness 50 μm: product name “S7561” manufactured by Toyobo Co., Ltd.] by gravure printing so that the thickness is 0.5 to 2 μm. Thus, a shrink label having a coating layer 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 externally fitted into a PET bottle having a substantially square cross section filled with coffee (temperature 85 ° C.) and having an internal volume of 500 ml. The container with a label shown in FIG. 2 was manufactured by passing through (temperature 90 ° C.) and causing heat shrinkage.

Example 2
In Example 1, as a coating agent, instead of surface-treated silica (trade name “NIPGEL AZ-260”), surface-treated silica (trade name “NIPGEL AY-460”, manufactured by Tosoh Silica Co., Ltd .; average particle diameter A coating agent (total amount of solid content (coating layer)) was mixed with the same components as in Example 1 except that 5 parts by weight was used (forming a polyolefin coating layer of 3.0 μm and 12% by weight based on silica particles). And 65% by weight of acrylic resin, about 17% by weight of surface-treated silica, about 17% by weight of oxidized polyethylene wax, and about 1.7% by weight of silicone oil).
Using this coating agent, a shrink label was obtained in the same manner as in Example 1.
A labeled container was produced by the same operation as in Example 1 using the obtained label.

Example 3
In Example 1, instead of oxidized polyethylene wax (trade name “Ceridust 3719”) as a coating agent, fluororesin powder (trade name “Aflon L169J”, manufactured by Asahi Glass Fluoropolymers Co., Ltd .; melting point 332 ° C., average particle size 13 μm ) Aside from using 5 parts by weight, the same components as in Example 1 were mixed, and the coating agent (about 65% by weight of acrylic resin with respect to the total solid content (coating layer), and about 17 of surface-treated silica). Containing 17% by weight of fluororesin powder and 1.7% by weight of silicone oil).
Using this coating agent, a shrink label was obtained in the same manner as in Example 1.
A labeled container was produced by the same operation as in Example 1 using the obtained label.

Example 4
In Example 1, instead of silicone oil (trade name “KF-96-100cs”) as a coating agent, amino-modified silicone oil (trade name “KF-859”, manufactured by Shin-Etsu Silicone Co., Ltd.) 0.5 weight The components similar to those in Example 1 were mixed except that the parts were used, and the coating agent (the acrylic resin was about 65% by weight, the surface-treated silica was about 17% by weight, based on the total solid content (coating layer), About 17% by weight of fluororesin powder and about 1.7% by weight of silicone oil).
Using this coating agent, a shrink label was obtained in the same manner as in Example 1.
A labeled container was produced by the same operation as in Example 1 using the obtained label.

Example 5
In Example 1, the same components as in Example 1 were mixed except that 10 parts by weight of surface-treated silica (trade name “NIPGEL AZ-260”) was used as the coating agent without using oxidized polyethylene wax. Thus, a coating agent (containing about 65% by weight of acrylic resin, about 34% by weight of surface-treated silica, and about 1.7% by weight of silicone oil) was prepared with respect to the total solid content.
Using this coating agent, a shrink label was obtained in the same manner as in Example 1.
A labeled container was produced by the same operation as in Example 1 using the obtained label.

Example 6
In Example 1, except that silicone oil was not used as a coating agent, the same components as in Example 1 were mixed to form a coating agent (66% by weight of acrylic resin based on the total solid content, surface treatment) 17% by weight of silica and 17% by weight of oxidized polyethylene wax).
Using this coating agent, a shrink label was obtained in the same manner 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, as a coating agent, instead of surface-treated silica (trade name “NIPGEL AZ-260”), silica particles (trade name “NIPGEL BY-200”, manufactured by Tosoh Silica Co., Ltd .; average particle size 1 .9 μm, untreated surface) except that 5 parts by weight were used, the same components as in Example 1 were mixed to obtain a coating agent (about 65% by weight of acrylic resin with respect to the total solid content (coating layer), About 17% by weight of silica particles, about 17% by weight of oxidized polyethylene wax, and about 1.7% by weight of silicone oil).
Using this coating agent, a shrink label was obtained in the same manner as in Example 1.
A labeled container was produced by the same operation as in Example 1 using the obtained label.

(Evaluation test)
Compatibility of the components of the coating agent Visually observe the coating agents prepared in the examples and comparative examples, and “○” indicates that the liquid mixture is uniform and there is no abnormality in the liquid state. Evaluated as “x”. These results are shown in the column “Compatibility” in Table 1.

Matte properties About the shrink labels obtained in Examples and Comparative Examples, the specular gloss at an angle of 60 ° was measured in accordance with JIS K 5600-4-7, and the specular gloss was 50 or less. ”, The case where it exceeded 50 was evaluated as“ x ”, and the matte property was evaluated. These results are shown in Table 1.

Sliding property About the shrink labels obtained in Examples and Comparative Examples, the outer surfaces of the shrink labels were overlapped with each other in accordance with JIS K 7125, and the static friction coefficient and the dynamic friction coefficient were measured. “O” when any friction coefficient is less than 0.45, “△” when at least one friction coefficient is 0.45 or more and any friction coefficient is 0.50 or less, The case where one coefficient of friction exceeded 0.50 was indicated by “x”, and the slipperiness was evaluated. These results are shown in Table 1.

Odor releasing properties For the labeled containers obtained in the examples and comparative examples, the odor emitted from the label surface was tested sensuously immediately after the label was put on, and when no odor was felt, “○”, a slight odor was felt. “△” was given for the case where the test was given, and “X” was given if the odor was felt. Moreover, the odor after storing a labeled container for 3 days in the refrigerator (5 degreeC) in which foodstuffs were accommodated was evaluated by the same method. The former results are shown in Table 1 as odor releasing properties after “manufacturing” and the latter as “after storage”.

It is a schematic sectional drawing which shows an 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

DESCRIPTION OF SYMBOLS 1 Plastic label 2 Base material 3 Coating layer 4 Printing layer 5 Container

Claims (2)

A shrink label in which a coating layer is formed on at least a surface of a heat-shrinkable plastic film substrate that does not come into contact with an adherend, and the coating layer is made of an acrylic resin having a glass transition temperature of 60 ° C. or more as a resin. And containing 10 to 40% by weight of surface-treated silica having a coating layer made of polyolefin of 10% by weight or more based on silica particles on the surface of the silica particles , and a fluororesin powder as a lubricant And a shrink label comprising at least one of oxidized polyethylene-based wax and silicone oil . Labeled containers shrink label of Claim 1 Symbol mounting is mounted.

Images