JPH1081860A - Label for drum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a label for a drum, which has an adhesive power substantially unchanged by the pressure of the application, which is stuck by both automatic and manual operations, which is not peeled off during distribution, storage, open-air storage for several months to about 2 years and in the steps of washing and drying conducted for reusing the drum in a drum-reprocessing facility, and which can be easily peeled from the drum after the drying step, leaving only a small amt. of an adhesive. SOLUTION: A label 4 for a drum is composed of a surface base 1 comprising synthetic paper, an adhesive layer formed on one surface of the surface base 1 and a release paper 3 coating the adhesive layer. The adhesive layer comprises a main adhesive 2, crosslinked with a crosslinking agent, and a tackifier as the main components, and the adhesive power of the adhesive layer is 500 to 1500gf/25mm as determined under a label-sticking pressure with a roller of 50 to 2,000g/50mm according to JIS Z 0237.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive label used for distribution management of drums.

[0002]

2. Description of the Related Art Conventionally, manufacturers of petroleum products, chemicals, etc., fill contents in drums and, when shipping to customers, provide information such as the type, serial number, and manufacturer name of the contents. Was directly painted on the drum surface. Examples of the drum can include a steel drum, a plastic drum, an oil can, and a pail.

[0003] After the contents of the can are consumed, the drum can
After being collected by a collecting company and the inside and outside of the drum can are washed at the drum can recycling factory, the old coating is further dropped by sand blasting, re-painted, and reused as a recycled drum can. But,
The drum can rusts during the distribution process, the storage process, and further in the open state for several months to two years, and the drum can itself is formed by an iron plate, which is heavy and difficult to handle. Peeling off the paint or repainting Because there is no need for
We are moving from steel drums to plastic drums. Plastic drums, like steel drums, are beginning to be reused.

[0004] A method of writing information on the surface of a drum can with paint or the like is to remove the old paint on the exterior by a sand blasting process at a drum can recycling plant to completely erase the information written with paint or the like. Not only is the entry of various information into the information complicated, but also it is difficult to print a bar code or the like in detail, which is an obstacle to computer logistics management using the bar code.

Recently, a paper label or a film label on which information such as a bar code is described by printing or the like has been attached to a drum can for use. However, in the case of a paper label, in order to remove the label from the drum can surface during the drum recycling process, the end of the paper label attached to the recovered drum can is manually scraped off with a spatula or the like, or the organic label is removed. It is necessary to peel off using a solvent, etc.
Phenomena such as the occurrence of adhesive residue on the adhesive are likely to occur, and the operation for peeling off the paper label is extremely complicated. In addition, drums are often placed in a stacked state, and the water resistance of paper labels is insufficient, so a label for over-laminate using a transparent plastic film as the surface base material is attached to the paper label surface. Need to be

On the other hand, in Japanese Utility Model Application Laid-Open No. 7-5170, synthetic paper by an internal paper method is used as a surface base material, and heated at 150 ° C. for about 10 minutes in a drying furnace of a drum can recycling factory. There has been proposed a label which can be easily peeled off by shrinking synthetic paper to cause peeling of a part of the label. However, even in such a label, the JI
A label having a sufficiently high adhesive strength at a fixed sticking pressure specified in SZ0237, for example, 500 gf / 25 mm
Even with the above, if the label is attached under actual use conditions, a part of and the entire surface of the label may be peeled off during distribution, storage, and consumption of the contents of the drum, which is a problem.

[0007]

SUMMARY OF THE INVENTION According to the present invention, in the operation of sticking a label to a drum, the change in the sticking force of the label due to the sticking pressure is small, and the sticking performance of the label is reduced even in a use environment such as outdoors. An object of the present invention is to provide a label which does not have any removability and has a removability to a painted surface of a drum.

[0008]

According to the present invention, a label for a drum can comprises a surface substrate made of synthetic paper, an adhesive layer laminated on one surface of the surface substrate, and the adhesive layer. In a label for a drum having a release paper,
The pressure-sensitive adhesive layer contains, as a main component, a pressure-sensitive adhesive main agent and a tackifier cross-linked by a cross-linking agent, and the pressure at which the label is applied by a roller is 50 to 2000 g / 50.
A label for a drum can, wherein the pressure-sensitive adhesive layer has an adhesive force of 500 to 1500 gf / 25 mm according to JIS Z 0237 in a range of mm. The label for a drum according to the present invention further comprises a JI under the temperature condition of 0 to 40 ° C.
The pressure-sensitive adhesive layer has an adhesive force of 500 according to SZ0237.
Preferably, it is 〜1500 gf / 25 mm. In the label for a drum according to the present invention, the pressure-sensitive adhesive main agent is an acrylic copolymer containing 20 to 80% by weight of 2-ethylhexyl acrylate units and 10 to 80% by weight of butyl acrylate units, and The viscosity is 2,000 to 10,000 at a concentration of 40% by weight in an ethyl acetate solvent.
Preferably, the crosslinking agent is an isocyanate compound and / or an epoxy compound, and is used in an amount of 1 to 10% by weight based on the pressure-sensitive adhesive main agent. Further, in the drum can label of the present invention, the tackifier is at least one selected from a rosin-based resin, a terpene-based resin and a petroleum resin, and is used in an amount of 5 to 30% by weight based on the pressure-sensitive adhesive main agent. Is preferred.

[0009]

DETAILED DESCRIPTION OF THE INVENTION The label for a drum according to the present invention comprises a surface substrate / adhesive layer / release paper, and is bonded to release paper for the purpose of protecting the adhesive layer surface. After peeling off the release paper of the label or sheet to expose the adhesive surface, it is used by sticking it to the drum can surface. As the surface base material, a synthetic paper having a multilayer structure containing a thermoplastic resin as a main component can be used. In the present invention, examples of the drum can include a steel drum can in which an iron plate is formed into a drum shape and painted, a plastic drum can in which plastic is formed, other pail cans, oil cans, and the like.

Commercially available synthetic papers that can be used as the surface substrate for the label of the present invention include “Yupo SGU”, “Yupo SGE”, and “Yupo SGE” manufactured by Oji Yuka Synthetic Paper Co., Ltd.
Grades such as "Yupo VES", grades such as "Crisper" manufactured by Toyobo Co., Ltd., "Peachcoat SG" and "Peachcoat S" manufactured by Nisshinbo Industries Co., Ltd. by surface coating method.
There are grades such as "P" and "Peachcoat SE", but preferably, a composition comprising a thermoplastic resin such as a polypropylene resin as a main raw material, an inorganic filler and a small amount of an additive, is melted and kneaded. It is preferable to use a synthetic paper formed by extrusion using an extruder and then biaxially stretched to produce an internal paper.

In the label of the present invention, the synthetic paper produced by the internal paper forming method used as the surface base material includes:
In the upper and lower surface layers, microvoids exist in one surface layer and no microvoids exist in the other surface layer, or the number of microvoids in the paper-like layer forming the upper and lower surface layers is different. A surface having a large number of microvoids and good printability and writability, and a pearl-shaped surface having a small number of microvoids and a high surface strength is preferably used. The pressure-sensitive adhesive layer has a surface without microvoids or a strong surface with a small number of microvoids (pearl surface) to prevent tearing when the label is peeled.
It is preferable to form it. 130 to 160 of this synthetic paper
When heated to 10 ° C. for 10 to 30 minutes, shrinkage of microvoids occurs, and the surface layer having microvoids or the surface layer side having many microvoids shrinks more and curls, and the edge of the label moves to the side that shrinks more. Emerges.

In the pressure-sensitive adhesive layer of the present invention, a cross-linkable pressure-sensitive adhesive is used and is selected from acrylic pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives and the like. For example, an acrylic adhesive, that is, a copolymer obtained by polymerizing an acrylate compound selected from 2-ethylhexyl acrylate, butyl acrylate, and butyl methacrylate as a main component, and a rubber adhesive, that is, natural rubber or Examples include a mixture of a synthetic rubber and a tackifier resin, a softener, and a silicone-based adhesive, that is, a mixture of a silicone rubber and a silicone resin, and an acrylic-based adhesive is preferably used in terms of cost and weather resistance. .
Among these pressure-sensitive adhesives, reduce the dependence of the pressure-sensitive adhesive force on the labeling pressure, improve the adhesion between the surface substrate and the pressure-sensitive adhesive layer, and improve the cohesive force of the pressure-sensitive adhesive layer to prevent adhesive residue. However, in order to impart removability to the drum and reduce the temperature dependence of the adhesion to the drum, a pressure-sensitive adhesive having a strong internal cohesion is preferable, and a crosslinking agent such as an isocyanate, an epoxy compound, melamine, or a metal chelate is used. The two-liquid cross-linkable acrylic pressure-sensitive adhesive is preferably used.

As the main adhesive of the cross-linking adhesive, a solvent-based acrylic adhesive is preferably used, and more preferably, 20 to 8 units of 2-ethylhexyl acrylate are used.
An acrylic copolymer containing 0% by weight and 10 to 80% by weight of butyl acrylate units, and the viscosity of the pressure-sensitive adhesive main agent is 4% when the solvent is ethyl acetate.
An acrylic copolymer having 2,000 to 10,000 mPa at 0% by weight is used. If necessary, butyl methacrylate, vinyl acetate, acrylic acid, maleic anhydride and the like are appropriately blended and copolymerized.

Examples of the crosslinking agent include isocyanate compounds such as xylidene diisocyanate, hexamethylene diisocyanate, toluylene diisocyanate, and aromatic triisocyanate, and derivatives thereof.
Examples include, but are not limited to, epoxy compounds such as butyl glycidyl ether and ethylene glycol glycidyl ether, derivatives thereof, and melamine resins. The amount of the cross-linking agent varies depending on the type thereof and cannot be unconditionally determined.

Further, a natural resin such as rosin or terpene or a synthetic resin such as petroleum resin is added to the pressure-sensitive adhesive, if necessary. In addition, it is possible to reduce the dependence of the adhesive force on the label sticking pressure, improve the removability of the drum can, and reduce the temperature dependence of the adhesive force on the drum can. For example, as a rosin resin, gum rosin, tall oil rosin, raw rosin such as wood rosin, polymerized rosin, hydrogenated rosin, disproportionated rosin, rosin ester, high hydroxyl value rosin ester, and the like, and terpene resins as terpene resins, Terpene phenolic resin, aromatic modified terpene resin, hydrogenated terpene resin, etc.
As the petroleum resin, aliphatic (C ₅ series), aromatic (C ₉ series) petroleum resin. Specific examples include grades such as "KE-364C", "Ester Gum", "Pencel", and "Super Ester" manufactured by Arakawa Chemical Industries, Ltd. Among these, "KE-
A rosin ester having a high hydroxyl value such as 364C ″ is preferably used. The amount of the tackifier is preferably about 5 to 30% by weight, more preferably about 10% by weight, based on the pressure-sensitive adhesive main agent.
-20% by weight. In addition, the cohesive force of the entire pressure-sensitive adhesive layer can be improved by appropriately crosslinking the tackifier together with the main pressure-sensitive adhesive using a cross-linking agent.

In the present invention, JIS Z 0237
At a constant temperature, a roller having a label applying pressure in the range of 50 to 2000 g / 50 mm at 300 mm /
It has been found that the pressure-sensitive adhesive layer needs to have an adhesive force in the range of 500 to 1500 gf / 25 mm when the label is applied to a stainless steel (SUS) plate by making one reciprocation at a speed of min. Was. When the adhesive strength is 500 gf / 25 mm or less, label peeling is likely to occur during the distribution process and storage process of the drum, and
The label may fall in a drying furnace of a drum can recycling factory, causing a problem such as contamination in the drying furnace and mechanical trouble. In the case of 1500 gf / 25 mm or more, when the label is peeled off from the drum in the drum can regenerating step, the adhesive strength between the drum and the label is too strong, so that the adhesive strength becomes stronger than the strength of the surface base material, the label is broken, and the surface base material is broken. There is a problem that the adhesive strength becomes stronger than the adhesive strength of the adhesive, and the adhesive residue of the label is generated on the drum. Preferably, the adhesive strength of the pressure-sensitive adhesive layer when applied to a drum can is in the range of 500 to 1500 gf / 25 mm.

Further, in the present invention, under the temperature condition of 0 to 40 ° C., SU is applied in accordance with JIS Z 0237.
The adhesive strength of the pressure-sensitive adhesive layer to the S plate is 500 to 1500 gf
/ 25 mm, preferably 700 to 1200 g
f / 25 mm is more preferable. Adhesive strength is 500gf / 2
In the case of 5 mm or less, the label can be easily peeled during the distribution process of the drum, the storage process, and the state of stacking for several months to two years, and the label may drop in the drying furnace of the drum recycling factory. As a result, there may be a case where the inside of the drying furnace becomes dirty and mechanical troubles are caused. 1500gf / 2
When the label is more than 5 mm, when peeling the label from the drum, the adhesive strength between the drum and the label becomes stronger, the adhesive strength becomes stronger than the strength of the surface base material, and the label tears, or the adhesive strength becomes larger than the adhesive strength between the surface base material and the adhesive. May become strong and glue residue may occur. Here, the adhesive strength of the label at a specific temperature is such that the label is attached to a SUS plate under the condition of 65% RH, and is further applied to the label surface at a speed of 300 mm / min using a roller of 2000 g / 50 mm at a speed of 300 mm / min. It is obtained by measuring the peeling force when peeling the label at a speed of 300 mm / min in the 180-degree direction after 20 to 40 minutes by reciprocating and pressing.

Under a temperature condition of 0 to 40 ° C., SUS
The adhesive strength of the pressure-sensitive adhesive layer to the plate is 500 to 1500 gf /
If it is 25 mm, the adhesive strength to a steel drum can is about 700 to 1500 gf / 25 mm, and the adhesive strength to a plastic drum can also be 500 to 1000 g.
f / 25 mm, and a desired range of adhesive strength can be obtained. In addition, based on JIS Z 0237, for example, for a label whose adhesive strength to a SUS plate is in the range of 500 to 1500 gf / 25 mm measured only at a temperature of 23 ° C., the adhesive strength is reduced under low or high temperature environmental conditions. This may cause peeling of the label, and conversely, the adhesive strength may be increased, causing the label to tear or leaving adhesive.

As the release sheet, for example, a general release paper obtained by applying a silicone-based or non-silicone-based release agent to polyethylene laminated paper or glassine paper can be used. Further, in order to prevent adhesive residue on the drum can surface, the surface of the surface substrate on which the adhesive is to be formed is subjected to corona discharge treatment in advance, or an anchor agent is applied to the surface, and the surface substrate and the adhesive layer are Adhesion can be ensured. Further, a coating layer can be formed on the surface of the surface substrate on which the pressure-sensitive adhesive is not laminated, in order to impart easy printability. For example, for the purpose of directly entering information such as the type of content, serial number, and manufacturer name, it is also possible to provide inkjet recording suitability or thermal transfer recording suitability, or to provide a heat-sensitive recording layer.

For the coating layer, known adhesives and pigments are used. Examples of the adhesive include acrylic resin, vinyl chloride copolymer, styrene-acrylonitrile copolymer, polycarbonate resin, polyester resin, polyurethane resin and the like. Thermoplastic resins are exemplified. These resins may contain additives such as a crosslinking agent, if necessary. For example, in the case of an image receiving layer for thermal transfer recording, if the glass transition temperature of the adhesive resin is too low, blocking occurs when stored at a relatively high temperature, or running failure occurs during printing, or the like. , That point needs to be considered.

The pigments used in the coating layer include silicon dioxide, calcium carbonate, magnesium carbonate,
Inorganic pigments such as zinc oxide, aluminum hydroxide, titanium oxide, calcium silicate, diatomaceous earth, mica, aluminum silicate, magnesium silicate, etc .; organic materials such as styrene and acrylic plastic pigments, polyethylene beads, microcapsules, urea resin, melamine resin Series pigments. If necessary, a dispersant, an antistatic agent, an antiblocking agent, an antifoaming agent, an antioxidant, a viscosity modifier and the like can be added.

The method for forming the pressure-sensitive adhesive, the release agent, and other coating layers is not particularly limited.
Appropriate coating methods such as reverse coating, reverse gravure coating, kiss coating, comma coating, die coating, bar coating, and knife coating can be applied.
The application speed and the drying conditions of the coating film are not particularly limited, but the drying conditions for application are desirably within a range that does not adversely affect the physical properties of the pressure-sensitive adhesive layer, the release layer, and the substrate.

[0023]

The present invention will be described in more detail with reference to the following Examples, but it should be understood that the present invention is by no means restricted to such specific Examples.
In the examples, “parts” and “%” all indicate “parts by weight” and “% by weight” unless otherwise specified. Example 1 In FIG. 1, a silicone-based release agent (trade name: LTC-300B, manufactured by Shin-Etsu Chemical Co., Ltd.) was applied to 82 g / m ² blue glassine paper at 0.9 g / m ² using a Mayer bar. Thus, a release paper 3 having a release layer was obtained. Then, 2
-Solution polymerization of 73 parts of ethylhexyl acrylate, 12 parts of butyl acrylate, 10 parts of butyl methacrylate, and 5 parts of acrylic acid in ethyl acetate using 1 part of benzoyl peroxide as an initiator to prepare a 40% -concentration adhesive main ingredient. Obtained. Furthermore, a high hydroxyl value rosin ester (trademark: KE-
364C, 10 parts of Arakawa Chemical Industry Co., Ltd.) and 5 parts of a polyfunctional aromatic isocyanate (trade name: Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.) as a cross-linking agent to prepare an adhesive, After applying 30 (dry) g / m ² on the release agent layer of the release paper 3 using an applicator, it was dried at 100 ° C. for 2 minutes to form an adhesive layer 2.
Thereafter, a synthetic paper having a thickness of 110 μm as a surface base material (trademark: Yupo VES-115, manufactured by Oji Yuka Synthetic Paper Co., Ltd.)
And a pearl surface of YUPO SGS provided with a printing coating layer on one surface thereof, and the pearl surface is adhered to the pressure-sensitive adhesive layer 2 and laminated. A drum label was obtained.

Example 2 26 parts of 2-ethylhexyl acrylate, 70 parts of butyl acrylate, 3 parts of vinyl acetate, and 1 part of acrylic acid were subjected to solution polymerization in ethyl acetate to obtain a 42% -concentration main agent of the pressure-sensitive adhesive. Highly hydroxyl value rosin ester (trademark: KE-364C, manufactured by Arakawa Chemical Industry Co., Ltd.) 10 as an agent
Part, polyfunctional aromatic isocyanate (trade name: Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.) as a crosslinking agent 1
Example 1 except that an adhesive prepared by adding
By the same prescription as above, a label for a drum, which was an example of the present invention, was obtained.

Example 3 75 parts of 2-ethylhexyl acrylate, 20 parts of butyl acrylate, 3 parts of vinyl acetate, 1.5 parts of acrylic acid,
A solution of 0.5 part of maleic anhydride in ethyl acetate was polymerized in ethyl acetate to obtain a 42% -concentration main adhesive, and a high hydroxyl value rosin ester (trade name: KE-364C,
Arakawa Chemical Industry Co., Ltd.) and 10 parts of a polyfunctional aromatic isocyanate (trade name: Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.) as a crosslinking agent. According to the same formulation as in Example 1, a label for a drum, which is an example product of the present invention, was obtained.

Example 4 75 parts of 2-ethylhexyl acrylate, 20 parts of butyl acrylate, 3.4 parts of vinyl acetate, 0.6 part of acrylic acid
The solution was polymerized in ethyl acetate to obtain a 40% -concentration adhesive main ingredient, and a high-hydroxyl-value rosin ester (trademark: KE-364C, Arakawa Chemical Industries, Ltd.) was used as a tackifier.
The same procedure as in Example 1 except that an adhesive prepared by adding 10 parts of a polyfunctional aromatic isocyanate (trade name: Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.) as a crosslinking agent was used. According to the above formula, a label for a drum which is an example of the present invention was obtained.

Example 5 In the preparation of the pressure-sensitive adhesive, a polyfunctional aromatic isocyanate (trade name: Coronate L, Nippon Polyurethane Industry Co., Ltd.)
The label for drums, which is an example product of the present invention, was obtained by the same formulation as in Example 1 except that the addition amount was changed to 4 parts.

Comparative Example 1 In the preparation of the pressure-sensitive adhesive, a high hydroxyl value rosin ester of a tackifier (trade name: KE-364C, Arakawa Chemical Industry Co., Ltd.)
Except for the above, a label for comparison was obtained by the same formulation as in Example 1.

Comparative Example 2 In the preparation of the pressure-sensitive adhesive, a high hydroxyl value rosin ester of a tackifier (trade name: KE-364C, Arakawa Chemical Industry Co., Ltd.)
Except for the above, a label for comparison was obtained by the same formulation as in Example 2.

Comparative Example 3 The procedure of Example 1 was repeated except that the polyfunctional aromatic isocyanate (trade name: Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.) was omitted in the preparation of the pressure-sensitive adhesive. , Got a label for comparison.

Evaluation Test For the labels obtained in each of the above Examples and Comparative Examples,
Evaluation was performed by the following method. [I] The obtained labels were evaluated for adhesive strength, label peeling, adhesive residue, and the like at different application pressures, and the results are shown in Table 1. (1) Adhesion pressure and adhesive strength measurement After removing the release paper from the label,
The adhesive layer was reciprocated once at a speed of 300 mm / min using rollers (50 mm width) of 50 g, 500 g, and 2000 g, respectively.
(US) It was pasted on a plate, and the adhesive strength was measured after 30 minutes.
Here, the adhesive strength was measured based on JIS Z 0237, and the label was peeled off at a rate of 300 mm / min in a 180 ° direction in an atmosphere of 23 ° C. and 65% RH.

(2) Label Peeling Test After removing the release paper from the label, the surface of each label was
Each of the three types of rollers was used in the same manner as described above.
One reciprocation was performed at a speed of 00 mm / min, and the pressure-sensitive adhesive layer was attached to a steel drum. Each of the samples in the affixed state was used as a weather resistance tester (trademark: SUV-W1).
1, made by Iwasaki Electric Co., Ltd.) for one year under sunlight, and the peeling state of the label was visually observed and evaluated according to the following criteria. [Label peeling evaluation criteria] A: No label peeling. ：: There is only a slight lifting at the edge portion, and there is no practical problem. X: About half of the label floated, causing a practical problem. XX: The label fell, making it impractical.

(3) Residual adhesive test After removing the release paper from the label, the surface of each label is
Each of the three types of rollers was used in the same manner as described above.
One reciprocation was performed at a speed of 00 mm / min, and the pressure-sensitive adhesive layer was attached to a steel drum. Each of the samples in the affixed state was used as a weather resistance tester (trademark: SUV-W1).
1, Iwasaki Electric Co., Ltd.), after exposure to sunlight for one year, heat treatment at 150 ℃, 15 minutes, before heating,
Immediately after heating and after cooling to room temperature, the state of adhesive residue when peeling off the label was visually observed and evaluated according to the following criteria. [Glue residue evaluation standard] A: There is no glue residue, and there is no practical problem at all. ：: There is a slight amount of adhesive residue on the edge portion, and there is no practical problem. Δ: There is some adhesive residue, but there is no practical problem. ×: Adhesive residue is present on the entire surface, which is not suitable for practical use.

[II] Each of the obtained labels was subjected to an evaluation of the temperature dependency of the adhesive strength, a weathering test such as label peeling and adhesive residue, and the results are shown in Table 2. (1) Adhesion Temperature and Adhesion Measurement Adhesion was measured according to JIS Z 0237,
At each temperature condition of 10, 22, and 40 ° C., the label from which the release paper was removed was stuck on a SUS plate in an atmosphere of 65% RH, and a 2000 g roller (50 m
(width), and reciprocated at a speed of 300 mm / min by one reciprocation, and after 30 minutes, 300 mm in the 180 degree direction.
The label was peeled off at a rate of / min, and the adhesive strength of the adhesive layer was measured. Table 2 shows cases where cohesive failure (: cf) or zipping (: z) occurred at the time of peeling.

(2) Weather resistance test A label was attached to each adherend of a steel drum and a plastic drum, and 2,000 g of the label surface was applied.
300mm / min using a roller (50mm width)
After one reciprocation at the speed described above, pressure bonding was performed, and exposure was performed for 1 year with sunlight by a weather resistance tester. Then, the peeling state of the label was visually observed and evaluated according to the same criteria as described above. further,
Heat treatment is performed at 150 ° C for 15 minutes for steel drums and at 120 ° C for 2 minutes for plastic drums. Before the heating, immediately after heating, after cooling at room temperature, the state of the adhesive residue when peeling off the label is visually observed. The evaluation was performed according to the same criteria as described above.

[0036]

[Table 1]

[0037]

[Table 2]

[0038]

The label for a drum according to the present invention has a small change in the adhesive force of the label due to the sticking pressure, so that it can be sticked by either automatic sticking or manual sticking.
No peeling of label during storage process, several months to 2 more
It does not peel off from the drum surface during the washing and drying process when it is used for reuse in a drum can recycling factory during the yearly unstacked state, and after the drying process, the label edge portion is heated by the heat in the drying furnace. Are easily lifted off and peeled off, and there is no adhesive residue on the surface of the drum can, and the substrate can be easily peeled off without tearing, thus exhibiting an excellent effect in practical use.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of one embodiment of a drum can label of the present invention.

[Description of Signs] 1 {Surface substrate made of synthetic paper 1a} Coating layer 1b {Paper-like layer 1c} Base layer of synthetic paper 1d {Paper-like layer (pearl surface) 2} Cross-linked Adhesive 3 ──Release paper 4 ラ ベ ル Drum can label

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical indication location C09J 7/02 JKE C09J 7/02 JKE G09F 3/10 G09F 3/10 B (72) Inventor Araki Kuniko 27 Uchinomiya Industrial Park, Utsunomiya City, Tochigi Pref.

Claims (4)

[Claims] 1. A drum label comprising: a surface substrate made of synthetic paper; an adhesive layer laminated on one surface of the surface substrate; and a release paper covering the adhesive layer. The pressure-sensitive adhesive layer contains a pressure-sensitive adhesive main agent and a tackifier crosslinked by a crosslinker as a main component, and
Label sticking pressure by roller is 50-2000
g / 50 mm, the adhesive strength of the pressure-sensitive adhesive layer conforming to JIS Z 0237 is 500 to 1500 gf / 25 m.
m, a label for a drum. 2. Under a temperature condition of 0 to 40 ° C., J
The pressure-sensitive adhesive layer according to ISZ0237 has an adhesive strength of 5
The label for a drum can according to claim 1, wherein the label has a thickness of from 00 to 1500 gf / 25 mm. 3. The pressure-sensitive adhesive base material is an acrylic copolymer containing 20 to 80% by weight of 2-ethylhexyl acrylate unit and 10 to 80% by weight of butyl acrylate unit, and the pressure-sensitive adhesive base material has a viscosity of: 2,000 to 10,000 mP at a concentration of 40% by weight in ethyl acetate solvent
The label for a drum can according to claim 1, wherein the label is a, and the crosslinking agent is an isocyanate compound and / or an epoxy compound, and is used in an amount of 1 to 10% by weight based on the pressure-sensitive adhesive main agent. 4. The drum according to claim 1, wherein the tackifier is at least one selected from a rosin-based resin, a terpene-based resin, and a petroleum resin, and is used in an amount of 5 to 30% by weight based on the pressure-sensitive adhesive main agent. For labels.