KR102234940B1 - Impact resistant tape for display - Google Patents

Abstract

The disclosed content relates to an impact-resistant tape for a display, and more particularly, includes a base layer, a first adhesive layer formed on the base layer, and a second adhesive layer formed under the base layer, and the agent One adhesive layer is formed by mixing and coating a composition containing 100 parts by weight of acrylic resin, 0.3 to 5 parts by weight of micro-hollow spheres, 0.1 to 5 parts by weight of a curing agent, and 90 to 110 parts by weight of a solvent, and the second adhesive layer is acrylic It is formed by mixing and coating a composition comprising 100 parts by weight of a resin, 0.1 to 5 parts by weight of a curing agent, and 90 to 110 parts by weight of a solvent.
The adhesive tape on which the impact-resistant foam layer is formed as described above not only has excellent impact resistance and reworkability, but also exhibits excellent waterproof performance.

Description

Impact resistant tape for display {IMPACT RESISTANT TAPE FOR DISPLAY}

The disclosed content relates to an impact-resistant tape for display, and more particularly, a micro-hollow layer having excellent impact resistance is formed to suppress the occurrence of cracks on the glass surface of the display device from external impact, and to an impact-resistant tape for display that exhibits excellent waterproofing effect. About.

In general, an adhesive tape is used in a display device to adhere and fix various types of display panels and electronic components, and the adhesive tape is interposed between the display window and the display assembly to perform a role of bonding them. The adhesive tape may serve to prevent intrusion of external impurities, etc. while fixing the rim of the display, and also prevent light irradiated from a light source mounted at the rear of the liquid crystal panel from leaking out of the rim of the display.

Conventionally, adhesive tapes are used by being punched into a shape such as a picture frame and arranged around a display screen. Recently, the opening area has been increased due to the miniaturization of electronic devices and the enlargement of the display screen. The joint and fixed parts around the screen are becoming narrower. For this reason, the adhesive area of the adhesive tape is decreasing year by year, and further excellent adhesive performance is required as the adhesive area becomes narrower.

In addition, in recent years, as the thickness of portable electronic devices such as smartphones and digital cameras gradually decreases, the glass surface of the display device is also thinned, and the frequency of cracking of the glass surface of the display device from external impact is increasing. To solve this problem, recently, in order to prevent cracking of the glass surface of the display device from external impact, a double-sided tape in which a foam layer having excellent impact resistance is applied between a substrate layer and an adhesive layer has been manufactured.

However, in the case of the adhesive tape to which the foam layer is applied between the base layer and the adhesive layer as described above, since the adhesive layer and the foam layer must be formed separately, there is a problem that the manufacturing process is complicated and the manufacturing cost is excessively improved, and reworkability This is low, and there is a problem in that bubbles are formed in the process of attaching the adherend.

Korean Patent Registration No. 10-1373235 (2014.03.05.) Korean Patent Publication No. 10-2017-0018150 (2017.02.16.)

Disclosed is to provide a tape having excellent adhesion and reworkability, as well as excellent waterproof performance and impact resistance.

As an embodiment, the contents of this disclosure include a base layer, a first adhesive layer formed on the base layer, and a second adhesive layer formed under the base layer, and the first adhesive layer is acrylic It is formed by mixing and coating a composition containing 100 parts by weight of resin, 0.3 to 5 parts by weight of micro-hollow spheres, 0.1 to 5 parts by weight of a curing agent, and 90 to 110 parts by weight of a solvent, and the second adhesive layer is 100 parts by weight of an acrylic resin, It describes an impact-resistant tape for a display, characterized in that formed by mixing and coating a composition containing 0.1 to 5 parts by weight of a curing agent and 90 to 110 parts by weight of a solvent.

Preferably, 0.3 to 5 parts by weight of micro-hollow spheres may be further included in the composition of the second adhesive layer to be formed.

As another embodiment, the content of this disclosure includes a base layer, a micro-hollow layer formed on the base layer, and a third adhesive layer formed on both surfaces of the micro-hollow layer, wherein the micro-hollow layer is urethane. It is formed by mixing and coating a composition comprising 100 parts by weight of resin, 0.3 to 5 parts by weight of micro-hollow spheres, 0.1 to 5 parts by weight of a curing agent, and 90 to 110 parts by weight of a solvent, and the third adhesive layer is 100 parts by weight of an acrylic resin, It describes an impact-resistant tape for a display, characterized in that formed by mixing and coating a composition containing 0.1 to 5 parts by weight of a curing agent and 90 to 110 parts by weight of a solvent.

Preferably, it may be formed to further include a fourth adhesive layer under the base layer.

The impact-resistant tape for a display as described above exhibits excellent effects with excellent adhesion, impact resistance, and reworkability.

1 is an exploded perspective view showing an impact resistant tape for a display according to an exemplary embodiment disclosed herein.
2 is an exploded perspective view showing an impact resistant tape for a display according to another disclosed embodiment.

Hereinafter, a preferred embodiment of the present invention and the physical properties of each component will be described in detail, but this is for explaining in detail enough that one of ordinary skill in the art can easily carry out the invention, This does not mean that the technical spirit and scope of the present invention are limited.

The disclosed impact-resistant tape for a display includes a base layer 10, a first adhesive layer 20 formed on the base layer 10, and a second adhesive layer 30 formed under the base layer 10. It is made including.

In another form, a base layer 10, a micro-hollow ball layer 40 formed on the base layer 10, and a third adhesive layer 50 formed on both surfaces of the micro-hollow ball layer 40 Including. In this case, the lower portion of the base layer 10 may be provided in a form having a more improved adhesive strength including a fourth adhesive layer.

The base layer 10 is a layer that serves as the base of the disclosed adhesive tape with excellent impact resistance, is formed to a thickness of 30 to 80 micrometers, and the disclosed impact-resistant tape for a display maintains a certain shape and is easily deformed by external force. It plays a role of preventing it from occurring, and consists of one selected from the group consisting of a polyethylene terephthalate film, a polyethylene vinyl acetate film, a polyethylene film, a polyvinyl chloride film, and a rubber film, and polyethylene terephthalate is particularly preferred.

If the thickness of the base layer 10 is less than 30 micrometers, the above effect is insignificant, and when the thickness of the base layer 10 exceeds 80 micrometers, the above effect is not greatly improved and the thickness of the double-sided tape Is not suitable for display devices that are becoming smaller and thinner due to excessive increase in

The first adhesive layer 20 is formed by mixing and coating a composition comprising 100 parts by weight of an acrylic resin, 0.3 to 5 parts by weight of micro-hollow spheres, 0.1 to 5 parts by weight of a curing agent, and 90 to 110 parts by weight of a solvent, and more preferably Specifically, a composition consisting of 100 parts by weight of an acrylic resin, 1 part by weight of a micro-hollow sphere, 1 part by weight of a curing agent, and 100 parts by weight of a solvent was mixed, coated by a comma coating method, and dried at 130 to 150° C. It is preferable to form the first adhesive layer 20. When the thickness of the first adhesive layer 20 is less than 90 micrometers, the adhesive performance and impact resistance are deteriorated, and when the thickness of the first adhesive layer 20 exceeds 110 micrometers, the adhesive performance is not significantly improved and the thickness of the tape increases excessively, resulting in miniaturization and thinning. It is not suitable for electronic devices that are used.

The second adhesive layer 30 is formed by mixing and coating a composition comprising 100 parts by weight of an acrylic resin, 0.1 to 5 parts by weight of a curing agent, and 90 to 110 parts by weight of a solvent, and more preferably 100 parts by weight of an acrylic resin, It is preferable to mix a composition consisting of 1 part by weight of a curing agent and 100 parts by weight of a solvent, coat it with a comma coating method, and dry at 130 to 150°C to form the first adhesive layer 20 having a thickness of 90 to 110 micrometers. If the thickness of the second adhesive layer 30 is less than 90 micrometers, the adhesive performance and impact resistance are deteriorated, and if the thickness of the second adhesive layer 30 exceeds 110 micrometers, the adhesive performance is not greatly improved and the thickness of the tape increases excessively, resulting in miniaturization and thinning. It is not suitable for electronic devices that are used.

In this case, the composition of the second adhesive layer 30 may further include 0.3 to 5 parts by weight of micro-hollow spheres relative to 100 parts by weight of the acrylic resin.

The micro-hollow sphere layer 40 is formed by mixing and coating a composition comprising 100 parts by weight of a urethane resin, 0.3 to 5 parts by weight of a micro-hollow sphere, 0.1 to 5 parts by weight of a curing agent, and 90 to 110 parts by weight of a solvent, and more preferably Specifically, a composition consisting of 100 parts by weight of a urethane resin, 3 parts by weight of micro-hollow spheres and 1 part by weight of a curing agent is mixed, coated by a comma coating method, and dried at 150 to 170° C., and a 50-micrometer-thick micro-hollow sphere layer 40 It is preferable to form.

The third adhesive layer 50 and the fourth adhesive layer are formed by mixing and coating a composition containing 100 parts by weight of an acrylic resin, 0.1 to 5 parts by weight of a curing agent, and 90 to 110 parts by weight of a solvent, and more preferably an acrylic resin. It is preferable to mix a composition consisting of 100 parts by weight of a curing agent and 100 parts by weight of a solvent to coat it with a comma coating method to form a third adhesive layer 50 and a fourth adhesive layer having a thickness of 50 to 100 micrometers. . If the thickness of the third adhesive layer 50 and the fourth adhesive layer is less than 50 micrometers, adhesive performance and impact resistance are deteriorated, and when the thickness of the third adhesive layer 50 and the fourth adhesive layer is less than 50 micrometers, the adhesive performance is not significantly improved and the thickness of the tape is excessive. It is not suitable for electronic devices that increase in size and become thinner.

The acrylic resin used in the first, second and third adhesive layers is made by polymerizing 50 parts by weight of normal butyl acrylate, 35 to 55 parts by weight of 2-ethylhexyl acrylate, and 3 to 7 parts by weight of acrylic acid, and the weight average It is preferred that the molecular weight is 650,000 to 750,000.

The urethane resin used in the micro-hollow layer 40 is made by polymerizing 70 parts by weight of polytetramethylene ether glycol and 20 to 40 parts by weight of isophorone diisocyanate, and preferably has a weight average molecular weight of 105,000 to 115,000.

The micro-hollow spheres used in the first and second adhesive layers and micro-hollow sphere layers are preferably 0.3 to 5 parts by weight based on 100 parts by weight of acrylic resin or urethane resin, silica, polymethyl methacrylate, glass beads, rubber powder And at least one selected from the group consisting of calcium carbonate. A mixture of silica and calcium carbonate is particularly preferable, and a polymerization ratio of silica and calcium carbonate is more preferably 2:1.

If the content of the micro-hollow sphere is less than 0.3 parts by weight, impact resistance is deteriorated, and when the content of the micro-hollow ball exceeds 5 parts by weight, workability may deteriorate and mechanical properties may be deteriorated.

In addition, the curing agent used in the first, second, and third adhesive layers and the micro-hollow sphere layer is not particularly limited as long as it is a component capable of curing an acrylic resin or urethane resin mixture, and any one may be used, but is composed of isocyanate. desirable.

In addition, the solvent used in the first, second, and third adhesive layers and the micro-hollow sphere layer serves to show homogeneous physical properties by evenly mixing the acrylic resin, urethane resin, micro-hollow sphere, foaming agent, and curing agent. As long as it is a component that is not particularly limited, any one can be used, but it is preferably made of methyl ethyl ketone.

In addition, an embossed pattern may be formed on the outer surface of the first adhesive layer 20, and the embossed pattern is preferably formed to have an intaglio depth of 40 to 65% of the thickness of the first adhesive layer.

When the embossed pattern is formed on the outer surface of the first adhesive layer 20 as described above, the impact resistant tape for display disclosed is easily separated from the surface to be adhered, so that not only excellent reworkability is imparted, but also can be applied to the surface to be adhered. In this case, the formation of air bubbles is suppressed, and thus excellent adhesion may be exhibited.

At this time, when the intaglio depth of the embossed pattern is less than 40% of the thickness of the first adhesive layer 20, the above effect is insignificant, and when the intaglio depth of the embossing pattern exceeds 65%, the first adhesive layer 20 ), it is not preferable because fixing to form the embossed pattern becomes complicated.

The method of forming the embossed pattern on the first adhesive layer 20 is to comma a mixture consisting of 100 parts by weight of an acrylic resin mixture, 0.5 to 1.5 parts by weight of a curing agent, and 90 to 110 parts by weight of a solvent in the embossed polyethylene terephthalate release film. After coating in a coating method, a method of drying at 120°C may be used.

Hereinafter, the disclosed method of manufacturing an impact resistant tape for display and the physical properties of the impact resistant tape for display manufactured through the manufacturing method will be described with reference to examples.

<Example 1>

An acrylic resin mixture (50 parts by weight of normal butyl acrylate, 45 parts by weight of 2-ethylhexyl acrylate, and 5 parts by weight of acrylic acid) is polymerized on the upper surface of the base layer made of polyethylene terephthalate with a thickness of 50 micrometers, and the weight average molecular weight A mixture consisting of 100 parts by weight of this 700,000), micro-hollow spheres (silica: calcium carbonate = 2:1 polymerization ratio mixture) 1 part by weight, a curing agent (isocyanate) 1 part by weight, and a solvent (methyl ethyl ketone) 100 parts by weight is mixed into a comma After coating by a coating method, drying at 140°C to form a first adhesive layer having a micro-hollow structure having a thickness of 100 micrometers, and an acrylic resin mixture (50 parts by weight of normal butyl acrylate, 2- It is made by polymerization of 45 parts by weight of ethylhexyl acrylate and 5 parts by weight of acrylic acid, and a mixture consisting of 100 parts by weight of a weight average molecular weight of 700,000), 1 part by weight of a curing agent (isocyanate) and 100 parts by weight of a solvent (methyl ethyl ketone) An impact-resistant tape for a display was prepared by coating in a coating method and drying at 140° C. to form a second adhesive layer having a thickness of 100 micrometers.

<Example 2>

Proceed to the upper surface of the base layer in the same manner as in Example 1, and the lower surface of the base layer is formed with a first adhesive layer having a double-sided micro-hollow (1 part by weight) structure in the same manner as the upper surface to form an impact resistant tape for display. Was prepared.

<Example 3>

In the same manner as in Example 2, except that the micro-hollow sphere was changed to 0.3 parts by weight in Example 2, an impact-resistant tape for a display was prepared.

<Example 4>

In the same manner as in Example 2, except that the micro-hollow sphere was changed to 3 parts by weight in Example 2, an impact-resistant tape for a display was prepared.

<Example 5>

In the same manner as in Example 2, except that the micro-hollow sphere was changed to 5 parts by weight in Example 2, an impact-resistant tape for a display was prepared.

<Example 6>

100 parts by weight of a urethane resin mixture (polymerized with 70 parts by weight of polytetramethylene ether glycol and 30 parts by weight of isophorone diisocyanate, weight average molecular weight of 110,000) on the upper surface of the base layer made of 50 micrometer thick polyethylene terephthalate, micro-hollow spheres (Silica: calcium carbonate = 2:1 polymerization ratio mixture) 3 parts by weight of a curing agent (isocyanate) 1 part by weight and a solvent (methyl ethyl ketone) 100 parts by weight of the mixture was coated by a comma coating method and dried at 160°C. A micro-hollow sphere layer having a micro-hollow sphere structure having a thickness of 50 μm was formed, and an acrylic resin mixture (normal butyl acrylate 50 parts by weight, 2-ethylhexyl acrylate 45) was formed on the upper and lower surfaces of the micro-hollow sphere layer. It is made by polymerization of 5 parts by weight and acrylic acid, and a weight average molecular weight of 700,000) 100 parts by weight, curing agent (isocyanate) 1 part by weight and solvent (methyl ethyl ketone) 100 parts by weight of a mixture of 100 parts by weight coating by comma coating method Through the process of forming a third adhesive layer having a thickness of 75 micrometers, an impact-resistant tape for a display was manufactured.

<Comparative Example 1>

Proceeding in the same manner as in Example 1, except that the same adhesive layer as the lower surface was formed on the upper surface of the base layer to prepare an impact-resistant tape for a display.

<Comparative Example 2>

In the same manner as in Example 2, except that the micro-hollow sphere was changed to 0.1 parts by weight in Example 2, an impact-resistant tape for a display was prepared.

<Comparative Example 3>

An impact-resistant tape was prepared in the same manner as in Example 2, except that the micro-hollow sphere was changed to 7 parts by weight in Example 2.

<Comparative Example 4>

An impact-resistant tape was prepared in the same manner as in Example 2, except that the micro-hollow hole was changed to 10 parts by weight in Example 2.

The impact resistance, reworkability, residue and waterproof performance of the impact resistant tapes for displays manufactured through Examples 1 to 6 and Comparative Examples 1 to 4 were measured and shown in Table 1 below.

{However, for the impact resistance of the impact-resistant tape for display, a steel plate and a SUS plate were placed on the impact measurement sensor, and the Example and Comparative Example specimens (thickness 100㎛, size 10cm X 10cm tempered glass, Example and Comparative Example samples Attached to the same size) were attached to the upper surface of the SUS plate. Then, 16g and 30g steel balls were dropped from a height of 100 cm to evaluate the number of times the tempered glass was broken.

For evaluation of reworkability and residues, samples of Examples and Comparative Examples were cut into 25 mm wide by 150 mm long, attached to a tempered glass specimen of 70 mm wide by 200 mm long and removed after 72 hours at room temperature. At this time, if it is cleanly removed without breaking, it is marked as OK, and if fracture occurs, it is marked as NG. In addition, if the adhesive remains on the tempered glass surface, it is marked as the presence of residue.

To evaluate the waterproof performance, samples of Examples and Comparative Examples were cut into 48 mm wide by 48 mm long, and then 47.3 mm wide by 47.3 mm long, and a sample with a thickness of 0.7 mm was prepared in a form in which a square shape was maintained. And after attaching the sample on the polycarbonate (PC) plate of the same size as the 60mm wide x 60mm x 6.5mm thick magnesium (Mg) plate, 50mm x 50mm x 2.8mm thick glass plate was attached. The prepared sample was allowed to stand at 24° C. for 72 hours and then placed in a water bath filled with 2 m of water. After 144 hours, samples were collected to check the presence/absence of leakage. Samples without leakage were marked as Pass and leaked samples were marked as NG.}

As shown in Table 1 above, it can be seen that the impact resistant tapes for displays manufactured through Examples 1 to 6 not only have excellent impact resistance, but also have excellent reworkability and excellent waterproof performance. In the case of Comparative Examples 3 and 4, it can be seen that the impact resistance increases as the weight of the micro-hollow tool increases, but the waterproof performance is insufficient.

Accordingly, the disclosed impact-resistant tape for displays not only has excellent impact resistance and reworkability, but also exhibits excellent effects in waterproof performance.

10; Base layer
20; First adhesive layer
30; Second adhesive layer
40; Micro hollow sphere layer
50; 3rd adhesive layer

Claims (11)

Base layer;
A first adhesive layer formed on the base layer; And
Including a second adhesive layer formed under the base layer,
The first adhesive layer and the second adhesive layer each contain 100 parts by weight of acrylic resin, 0.3 to 5 parts by weight of micro-hollow spheres, 0.1 to 5 parts by weight of curing agent, and 90 to 110 parts by weight of solvent, wherein the micro-hollow spheres are silica And the polymerization ratio of calcium carbonate is 2:1, the solvent is methyl ethyl ketone,
An embossed pattern is formed on the outer surface of the first adhesive layer, and the intaglio depth of the embossed pattern is 40 to 65% of the thickness of the first adhesive layer.
delete Base layer;
A micro-hollow layer formed on the base layer; And
Including a third adhesive layer formed on both sides of the micro-hollow sphere layer,
The micro-hollow sphere layer,
100 parts by weight of a urethane resin, 0.3 to 5 parts by weight of micro-hollow spheres, 0.1 to 5 parts by weight of a curing agent, and 90 to 110 parts by weight of a solvent, wherein the urethane resin is 70 parts by weight of polytetramethylene ether glycol, 20 to isophorone diisocyanate It is made by polymerization of 40 parts by weight, the weight average molecular weight is 105,000 to 115,000, the micro-hollow sphere has a polymerization ratio of silica and calcium carbonate is 2:1,
The third adhesive layer,
100 parts by weight of an acrylic resin, 0.1 to 5 parts by weight of a curing agent, and 90 to 110 parts by weight of a solvent,
In the micro-hollow layer and the third adhesive layer, the solvent is methyl ethyl ketone.
The method of claim 3,
An impact resistant tape for display, further comprising a fourth adhesive layer under the base layer.
The method according to claim 1 or 3,
The substrate layer is formed to a thickness of 30 to 80 micrometers, and is made of one selected from the group consisting of a polyethylene terephthalate film, a polyethylene vinyl acetate film, a polyethylene film, a polyvinyl chloride film, and a rubber film. Impact resistant tape.
The method according to claim 1 or 3,
The acrylic resin is made by polymerization of 50 parts by weight of normal butyl acrylate, 35 to 55 parts by weight of 2-ethylhexyl acrylate, and 3 to 7 parts by weight of acrylic acid, and has a weight average molecular weight of 650,000 to 750,000. Impact tape.
delete delete delete The method according to claim 1,
The first adhesive layer and the second adhesive layer is an impact resistant tape for display, characterized in that formed to a thickness of 90 to 110 micrometers.
The method of claim 3,
The third adhesive layer is an impact resistant tape for display, characterized in that formed to a thickness of 50 to 100 micrometers.

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