KR20200004675A - Adhesive composition and label comprising the same - Google Patents

Abstract

The present invention relates to an adhesive composition and a label paper comprising the same. The label paper comprises a substrate layer and an adhesive layer formed in at least one region on the substrate layer, wherein the adhesive layer comprises a foaming agent. In addition, the label paper is easily removed from an adherend, thereby being easy to recycle and eco-friendly.

Description

Adhesive composition and label containing the same {ADHESIVE COMPOSITION AND LABEL COMPRISING THE SAME}

The present invention relates to an adhesive composition and a label comprising the same.

Recently, recycling wastes occurred as a Seoul Metropolitan area recycling company refused to collect recycled materials such as vinyl and plastic.

Ordinary PET bottles are classified as plastic recycled products, but the reality is that they are thrown away without removing the labels on the PET bottles. Such label paper has to be removed once again in the recycling phase with vinyls, which is not only cumbersome but also has a problem in that it is not properly recycled.

In order to improve such a problem, an example of a technique for enabling a label to be used as a beverage cup is disclosed in Patent Document 1 below.

That is, the following Patent Document 1 relates to a label that is installed along the surface circumference of the beverage container so that two sheets of paper are superimposed on each other and both sides are high frequency welded to be attached to the surface of the beverage container. A first sheet and a second sheet sheet folded and folded to be formed higher than the first sheet sheet, and a first attachment surface formed by overlapping both side surfaces of the first sheet sheet and the second sheet sheet A partition line partitioning the first sheet paper and the second sheet paper and a partition portion formed by the partition line and separated from the first sheet paper and the second sheet paper by cutting of the partition line, and a suture portion formed inside the beverage sheet portion. It is made about the completion.

However, Patent Document 1 as described above has a problem in that a cost is generated because the machine must be additionally purchased for the manufacture of the label paper, and the manufacturing time is long because the process is complicated.

Republic of Korea Utility Model No. 20-2011-0005550

An object of the present invention is to provide a pressure-sensitive adhesive composition and a label containing the same easily detachable from the surface of the adherend.

The object of the present invention is not limited to the above-mentioned object. The object of the present invention will become more apparent from the following description, and will be realized by the means described in the claims and combinations thereof.

The label paper according to the embodiment of the present invention includes a base layer and an adhesive layer formed on at least one region on the base layer, and the adhesive layer includes a foaming agent.

The adhesive layer may be included in 20 to 80% of the total area of the base layer.

The blowing agent is magnesium hydroxide, azodicarbonamide, oxydibenzenesulfonylhydrazide (OBSH), p-toluenesulfonyl hydrazide, sodium bicarbonate, sodium bicarbonate ), Hydrocarbon, hydrocarbon, ethylene vinyl acetate (ethylene-vinyl acetate, EVA) and a combination thereof may include at least one selected from the group consisting of.

The adhesive force of the adhesive layer may be lost at a water temperature of 60 ~ 90 ℃.

Adhesive composition according to another embodiment of the present invention is a polyester resin (Polyester Resins) 30-50% by weight, methyl ethyl ketone (MethylEthylKetone) 10-30% by weight, toluene 10-30% by weight, blowing agent 3-20 Wt%, polyester polyol 1-10% by weight, isocyanate 1-5% by weight, polyethylene wax (PolyEthylene Wax) 0.1-5% by weight, and fillers 0.01-1% by weight.

The blowing agent is magnesium hydroxide, azodicarbonamide, oxydibenzenesulfonylhydrazide (OBSH), p-toluenesulfonyl hydrazide, sodium bicarbonate, sodium bicarbonate ), Hydrocarbon, hydrocarbon, ethylene vinyl acetate (ethylene-vinyl acetate, EVA) and a combination thereof may include at least one selected from the group consisting of.

The fillers are silica (Silica, SiO ₂ ), aluminum oxide (Aluminum oxide), magnesium oxide (Magnesium oxide), calcium oxide (Calcium oxide), aluminum hydroxide, magnesium hydroxide, calcium hydroxide (Calcium hydroxide) ), Carbon, zirconia (Zirconia, Zirconium oxide), antimony oxide (Antimony oxide) may include at least one selected from the group consisting of a combination thereof.

The glass transition temperature of the polyester resin may be 10 ~ 70 ℃.

The blowing agent may be foamed at a water temperature of 60 ~ 90 ℃.

The adhesive composition for labeling of the present invention has an advantage of being easily detachable from the surface of the adherend under water temperature conditions of 60 to 90 ° C by including a foaming agent in an amount of 3 to 20% by weight based on the total weight of the adhesive composition for labeling.

In addition, the labeling of the present invention can be easily detached from the adherend because it is easy to separate the collection and there is an environmentally friendly advantage.

1 is a perspective view showing the adherend attached to the label.
2 is an exploded perspective view of FIG. 1.
3 is a cross-sectional view showing a label sheet.
4 is a plan view showing a label sheet.

Objects, other objects, features and advantages of the present invention will be readily understood through the following preferred embodiments associated with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosure may be made thorough and complete, and to fully convey the spirit of the invention to those skilled in the art.

In describing the drawings, similar reference numerals are used for similar elements. For example, if a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the other part "on top" but also another part in the middle.

Hereinafter, the adhesive composition of this invention is demonstrated in detail.

The adhesive composition of the present invention is a polyester resin (Polyester Resins) 30-50% by weight, methyl ethyl ketone (MethylEthylKetone) 10-30% by weight, toluene 10-30% by weight, blowing agent 3-20% by weight, polyester 1 to 10% by weight of polyol (Polyester polyol), 1 to 5% by weight of isocyanate (Isocyanate), 0.1 to 5% by weight of polyethylene wax (PolyEthylene Wax), and 0.01 to 1% by weight of a filler.

First, the component of the adhesive composition and the reason for limitation of each component are demonstrated.

Polyester Resins have a glass transition temperature of 10 to 70 ° C, which is released by heat to impart adhesion to the adherend, and is 30 to 50% by weight, preferably 35 to 45% by weight, based on the total weight. % May be included. If it is less than 30% by weight, the adhesive force may be lost, and if it is more than 50% by weight, the adhesive force may become strong, and detachment may be difficult.

Methyl ethyl ketone (MethylEthylKetone) is the main solvent for dissolving the polyester resin, it may be included in the 10 to 30% by weight, preferably 15 to 25% by weight based on the total weight. If it is less than 10% by weight, the polyester resin may not melt properly, and if it exceeds 30% by weight, processing may be difficult due to the addition of more than necessary main solvent.

Toluene (Toluene) is a co-solvent for controlling the viscosity of the polyester resin, may be included 10 to 30% by weight, preferably 15 to 25% by weight relative to the total weight. If it is less than 10% by weight, the adhesive strength during coating in the labeling process may be weakened, if it exceeds 30% by weight, it may take a long time to dry due to the high viscosity.

The blowing agent is a material added to lose adhesion between the adherend and the label, and may include 3 to 20% by weight, preferably 5 to 15% by weight based on the weight of the filling. If it is less than 3% by weight, it may be difficult to detach the label from the adherend at the water temperature of 60 ~ 90 ℃ it is difficult to detach the label from the adherend, if it exceeds 20% by weight, it is difficult to secure the adhesion or adhesion required by the label itself Can be.

Here, the blowing agent is magnesium hydroxide, azodicarbonamide, oxydibenzenesulfonylhydrazide (OBSH), p-toluenesulfonyl hydrazide, sodium bicarbonate (sodium bicarbonate) Sodium bicarbonate), hydrocarbon, hydrocarbon, ethylene vinyl acetate (ethylene-vinyl acetate, EVA) and at least one selected from the group consisting of a combination thereof. In contrast, the foaming agent may include a chemical foaming agent and a capsule foaming agent, and the chemical foaming agent and the capsule foaming agent may be combined in a weight ratio of 1: 1. If the content of the chemical foaming agent is greater than the content of the capsule foaming agent, it is difficult to control the particle size, and if the content of the capsule foaming agent is higher than the content of the chemical foaming agent, it may be difficult to secure the surface friction coefficient. In the above description, but limited to the components of the blowing agent, if it is a material that can start foaming by reacting with water at a water temperature of 60 ~ 90 ℃, preferably 70 ~ 80 ℃, more preferably 70 ℃, There is no big limit.

Polyester polyol is a material added to improve the adhesion performance between the base layer and the adhesive layer by causing a urethane reaction with isocyanate, and is 1 to 10% by weight, preferably 3 to 8% by weight based on the total weight. % May be included. If it is less than 1% by weight, it may be difficult to prepare a label because the adhesive effect between the base layer is insignificant, if it exceeds 10% by weight, the production cost may be increased due to the addition of more than necessary.

Isocyanate is a material added to react with the polyol to improve heat and chemical resistance as well as substrate adhesion, and may be included in an amount of 1 to 5% by weight, preferably 2 to 4% by weight, based on the total weight. If it is less than 1% by weight, it may be difficult to secure heat resistance and chemical resistance, and when it exceeds 5% by weight, processing may be difficult.

Polyethylene wax (PolyEthylene Wax) is a material added to enable the mixture to form a crystal quickly, 0.1 to 5% by weight, preferably 0.5 to 3% by weight based on the total weight. If it is less than 0.1% by weight, the mixture may be unstable, and if it exceeds 5% by weight, processing may be difficult.

Filler is a material added to prevent blocking and improve slip or printability during the coating operation of the adhesive composition in the manufacturing process of the label paper, 0.01 to 1% by weight, preferably 0.05 to 0.5 Weight% may be included. If it is less than 0.01% by weight, slip or printability may be poor, and when it is more than 1% by weight, inconvenience may occur in a label paper manufacturing process.

Here, the filler is silica (Silica, SiO ₂ ), aluminum oxide (Aluminum oxide), magnesium oxide (Magnesium oxide), calcium oxide (Calcium oxide), aluminum hydroxide (Aluminum hydroxide), magnesium hydroxide (Magnesium hydroxide), calcium hydroxide (Calcium At least one selected from the group consisting of hydroxide, carbon, zirconia (Zirconia, Zirconium oxide), antimony oxide, and combinations thereof, preferably silica (SiO ₂ ).

In the adhesive composition of the present invention as described above, by including the foaming agent in 3 to 20% by weight, the foaming is initiated at a water temperature of 60 to 90 ℃, preferably 70 ℃ can be easily detached from the label by the specific gravity have.

1 is a perspective view showing the adherend attached to the label, Figure 2 is an exploded perspective view of Figure 1, Figure 3 is a cross-sectional view showing a label.

1 to 3, the label sheet 10 of the present invention may be attached to a region of the adherend 1, where the label sheet 10 is formed on the substrate layer 11 and the substrate layer 11. It is provided in at least one region, and includes a pressure-sensitive adhesive layer 12 in direct contact with the adherend 1, the pressure-sensitive adhesive layer 12 may include 3 to 20% by weight of the blowing agent relative to the total weight. For example, the adhesive layer 12 may include 30 to 50% by weight of polyester resin, 10 to 30% by weight of methyl ethyl ketone, 10 to 30% by weight of toluene, and 3 to 20% by weight of foaming agent. , 1 to 10% by weight of polyester polyol, 1 to 5% by weight of isocyanate, polyethylene wax (PolyEthylene Wax) 0.1 to 5% by weight and the filler may include 0.01 to 1% by weight. Each component of the above-mentioned pressure-sensitive adhesive layer has already been described above and thus will be omitted.

Here, the base layer 11 is polyethylene (PE), polyethylene terephthalate (PET), polypropylene (PP), polybutylene terephthalate (PBT), polyethylene naphthalate (Polyethylenenaphthalate, PEN) ), Polybutylene naphthalate (Polybutylenenaphthalate (PBN)) and combinations thereof may be at least one selected from the group consisting of, preferably polyethylene (PE) or polyethyl terephthalate (PET).

4 is a plan view showing a label sheet.

Referring to FIG. 4, the adhesive layer 12 may be formed to have the same area as the base layer 11, and may be formed to occupy 20 to 80% of the total area of the base layer 11. This may be difficult to provide sufficient adhesive force if the area of the adhesive layer is less than 20%. In FIG. 4, although the adhesive layer 12 is illustrated in a dot shape, the adhesive layer 12 is not limited thereto, and the adhesive layer 12 may be formed in a pattern having various shapes such as a line, a triangular shape, and a square shape. The degree of adhesion can be adjusted.

In addition, an adhesive layer 12 may be formed on one surface of the substrate layer 11, and letters or pictures may be printed on the other surface of the substrate layer 11.

The pressure-sensitive adhesive layer 12 of the present invention may lose the adhesive strength at a water temperature of 60 ~ 90 ℃, preferably 70 ~ 80 ℃, more preferably 70 ℃ by the blowing agent. Specifically, since the foaming agent of the adhesive layer 12 starts foaming at a water temperature of 60 to 90 ° C, preferably 70 to 80 ° C, more preferably 70 ° C, the adhesive force of the label paper 10 is lost due to specific gravity, thereby avoiding The label sheet 10 can be easily detached from the complex 1.

As described above, in the present invention, since the labeling agent can be easily detached or removed from the adherend by applying the blowing agent, separation and collection can be easy and environmentally friendly.

Example 1 Preparation of Labels

To prepare a pressure-sensitive adhesive by blending the content of each component of the pressure-sensitive adhesive composition disclosed in Table 1.

The prepared pressure-sensitive adhesive was applied on a polypropylene film and then dried to prepare a label.

Table 1 is a table showing the components of each of the pressure-sensitive adhesive composition by weight.

division Example 1 Example 2 Example 3 Furtherance
range Polyester resin 40 40 40 Methyl ethyl ketone 22 20 18 toluene 23.9 20.9 17.9 blowing agent Magnesium hydroxide 5 10 15 Polyester polyol 5 5 5 Isocyanate 3 3 3  Polyethylene wax One One One Filler Silica 0.5 0.5 0.5

Comparative Example 1. Label Production

Compared with the same method as the preparation method of Examples 1 to 3 except for preparing a pressure-sensitive adhesive (adhesive) by combining the content of each component of the pressure-sensitive adhesive (adhesive) composition does not include the foaming agent disclosed in Table 2 The label of Example 1 was prepared.

Table 2 is a table showing the components of each of the adhesive (adhesive) compositions in weight percent.

division Comparative Example 1 Furtherance
range Polyester resin 40 Methyl ethyl ketone 25 toluene 25.9 Polyester polyol 5 Isocyanate 3  Polyethylene wax One Filler Silica 0.1

Experimental Example 1. Desorption Characteristics of Label Paper

After the label sheets obtained in Examples 1 to 3 and Comparative Example 1 according to the present invention were attached to the adherends, experiments were performed as follows to evaluate the desorption characteristics of the label sheets.

Plastic containers were used as adherends.

The plastic containers to which the labels of Examples 1 to 3 and Comparative Example 1 were attached were dipped in water at 50 ° C., and then the change in the labels was observed while changing the temperature conditions of the water.

Table 3 is a table showing the degree of desorption of the label according to the temperature conditions (%).

As a result, referring to Table 3, the labels of Examples 1 to 3 were desorbed from 60 to 90% from the container at 85 ℃, it was confirmed that the label of Comparative Example 1 is still attached to the container. Thus, it was possible to guess that foaming of the foaming agent was started in the adhesive layer of the labels of Examples 1 to 3.

Temperature conditions Example 1 Example 2 Example 3 Comparative Example 1 50 ℃ 0 0 0 0 60 ℃ 0 0 0 0 70 ℃ 0 3 5 0 75 ℃ One 10 30 0 80 ℃ 20 50 70 0 85 ℃ 60 80 90 0 90 ℃ 70 98 100 0

As mentioned above, although the invention made by the present inventor was demonstrated concretely according to the said Example, this invention is not limited to the said Example and can be variously changed in the range which does not deviate from the summary.

1: adherend
10: label
11: base layer
12: adhesive layer

Claims (9)

Base layer; And
An adhesive layer formed on at least one region on the substrate layer,
Label paper containing the adhesive layer foaming agent.
The method of claim 1,
The adhesive layer is a label comprising 20 to 80% of the total area of the base layer.
The method of claim 1,
The blowing agent is magnesium hydroxide, azodicarbonamide, oxydibenzenesulfonylhydrazide (OBSH), p-toluenesulfonyl hydrazide, sodium bicarbonate, sodium bicarbonate Label, including at least one selected from the group consisting of hydrocarbon, ethylene-vinyl acetate (EVA), and combinations thereof.
The method of claim 1,
The adhesive strength of the adhesive layer is lost in the water temperature of 60 ~ 90 ℃.
30 to 50% by weight of polyester resins (Polyester Resins);
10-30% by weight of methyl ethyl ketone;
10 to 30% by weight of toluene;
3 to 20% by weight of blowing agent;
1 to 10% by weight of polyester polyol;
1-5% by weight of isocyanate;
0.1-5% by weight of polyethylene wax (PolyEthylene Wax); And
Adhesive composition comprising 0.01 to 1% by weight of a filler.
The method of claim 5,
The blowing agent is magnesium hydroxide, azodicarbonamide, oxydibenzenesulfonylhydrazide (OBSH), p-toluenesulfonyl hydrazide, sodium bicarbonate, sodium bicarbonate ), A hydrocarbon (hydrocarbon), ethylene-vinyl acetate (ethylene-vinyl acetate, EVA) and at least one selected from the group consisting of a combination thereof.
The method of claim 5,
The fillers are silica (Silica, SiO ₂ ), aluminum oxide (Aluminum oxide), magnesium oxide (Magnesium oxide), calcium oxide (Calcium oxide), aluminum hydroxide, magnesium hydroxide, calcium hydroxide (Calcium hydroxide) ), Carbon, zirconia (Zirconia, Zirconium oxide), antimony oxide (Antimony oxide) and an adhesive composition comprising at least one selected from the group consisting of a combination thereof.
The method of claim 5,
The glass transition temperature of the polyester resin is 10 ~ 70 ℃ pressure-sensitive adhesive composition.
The method of claim 5,
The foaming agent is an adhesive composition in which foaming is initiated at a water temperature of 60 ~ 90 ℃.

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