KR102042225B1 - Waterproof double-sided adhesive tape having improved fracture resistant - Google Patents

Abstract

The present invention relates to a waterproof double-sided tape having excellent fracture resistance and, more specifically, to a waterproof double-sided tape which comprises: a base layer; a buffer layer formed on one surface of the base layer and containing a resin having storage modulus of 40000 to 90000 Pa; and an adhesive layer formed on upper and lower surfaces of the base layer on which the buffer layer is formed. The double-sided tape consisting of the configuration has excellent waterproofing performance, and shows excellent fracture resistance by including the adhesive layer and the buffer layer containing the resin having excellent storage modulus.

Description

Waterproof double sided tape with excellent fracture resistance {WATERPROOF DOUBLE-SIDED ADHESIVE TAPE HAVING IMPROVED FRACTURE RESISTANT}

The present disclosure relates to a waterproof double-sided tape having excellent fracture resistance, and more particularly, a buffer layer and a pressure-sensitive adhesive layer containing a resin having excellent waterproof modulus and excellent storage modulus are formed, and thus have excellent fracture resistance. An excellent waterproof double sided tape.

Double-sided adhesive tape is mainly used for assembling electronic devices equipped with an image display device or an input device. Specifically, a cover panel for protecting the surface of the electronic device is attached to the touch panel module or the display panel module, or touched. Double-sided adhesive tape is used to bond the panel module and the display panel module.

Conventionally, a double-sided adhesive tape is punched into a shape of a picture frame or the like and used to be disposed around the display screen. In recent years, the opening area has been increased due to the miniaturization of electronic devices and the large screen of the display screen. The joint fixing part around the display screen is narrowing. For this reason, the adhesive area of adhesive tape is decreasing year by year, and as adhesive area becomes narrow, further excellent adhesive performance is calculated | required.

In addition, recently, as the thickness of portable electronic devices such as smartphones and digital cameras is becoming thinner, the thickness of double-sided adhesive tapes is becoming thinner, and in addition to adhesive performance, as consumer demand for waterproof performance of portable electronic devices increases, In order to secure a competitive advantage in the market, the development of double-sided tape with waterproof performance is being made.

However, in the case of the conventionally developed double-sided adhesive tape, the waterproof performance of the adhesive layer formed on the double-sided adhesive tape is usually maintained, but when an impact is applied from the outside, there is a problem in that the adhesive layer is cracked and the waterproof performance is lost. .

Korea Patent Registration No. 10-1527184 (2015.06.02) Korean Patent Publication No. 10-2015-0126588 (2015.11.12)

Disclosed is to provide a waterproof double-sided tape showing excellent fracture resistance by forming a buffer layer and a pressure-sensitive adhesive layer containing a resin having excellent waterproof performance and excellent storage modulus.

As an example, the contents of the present disclosure are formed on a base layer, one surface of the base layer, a buffer layer containing a resin having a storage modulus of 40000 to 90000 Pa, and a top surface and a bottom surface of the base layer on which the buffer layer is formed. It describes the waterproof double-sided tape excellent in fracture resistance, characterized in that the adhesive layer formed.

Preferably, the substrate layer may be made of polyethylene terephthalate having a thickness of 25 to 100 micrometers.

More preferably, the buffer layer may be composed of 100 parts by weight of an acrylic resin or urethane resin having a storage modulus of 40000 to 90000 Pa, 0.1 to 10 parts by weight of a filler, and 0.1 to 10 parts by weight of a curing agent.

More preferably, the filler has a particle size of 0.001 to 50 micrometers, and may be made of one selected from the group consisting of polymethylmethacrylate, hydrocarbons, calcium carbonate and silica.

Even more preferably, the buffer layer may be formed to a thickness of 10 to 200 micrometers.

Even more preferably, the pressure-sensitive adhesive layer is formed to a thickness of 10 to 200 micrometers, it may be composed of 100 parts by weight of acrylic resin or urethane resin having a storage modulus of 40000 to 90000 Pa and 0.1 to 10 parts by weight of a curing agent.

As described above, the waterproof double-coated tape having excellent fracture resistance not only has excellent waterproofing performance but also has a buffer layer and an adhesive layer containing a resin having excellent storage modulus, thereby providing an excellent double-sided tape showing excellent fracture resistance. .

1 is an exploded perspective view showing a waterproof double-sided tape having excellent fracture resistance according to one embodiment disclosed.

In the following, preferred embodiments of the present invention and the physical properties of each component will be described in detail, which is intended to explain in detail enough to be able to easily carry out the invention by one of ordinary skill in the art, This does not mean that the technical spirit and scope of the present invention is limited.

The disclosed waterproof double-coated tape having excellent fracture resistance is formed on the base layer 10, one surface of the base layer 10, and a buffer layer 20 and a buffer layer 20 containing a resin having a storage modulus of 40000 to 90000 Pa. The adhesive layer 30 is formed on the upper and lower surfaces of the base layer 10.

The base layer 10 is a layer of a waterproof double-coated tape having excellent fracture resistance disclosed, and is made of polyethylene terephthalate having a thickness of 25 to 100 micrometers. It plays a role in maintaining it.

When the thickness of the base layer 10 is less than 25 micrometers, the waterproof double-sided tape initiated by an external force may be easily deformed or broken. When the thickness of the base layer 10 exceeds 100 micrometers, the above effect is greatly increased. The thickness of the double-sided tape is excessively increased without improvement, making it difficult to apply to electronic products which are miniaturized and thinned.

The buffer layer 20 has a thickness of 10 to 200 micrometers on one surface of the base layer 10, and contains a resin having a storage modulus of 40000 to 90000 Pa. The resin may be acrylic or urethane. Specifically, the storage elastic modulus is composed of 100 parts by weight of an acrylic resin or a urethane resin having a 40000 to 90000 Pa, 0.1 to 10 parts by weight of a filler and 0.1 to 10 parts by weight of a curing agent.

The double-sided tape on which the buffer layer 20 formed of the above thickness and components is formed shows a high fracture resistance by applying a resin having excellent storage modulus. If the thickness of the buffer layer 20 exceeds 200 micrometers, the thickness of the double-sided tape is excessively increased while not greatly improving the effect, which is not preferable.

In addition, when the storage modulus of the acrylic resin or the urethane resin constituting the buffer layer 20 is less than 40000 Pa, the effect of improving the fracture resistance caused by the buffer layer 20 is insignificant.

At this time, the filler used in the buffer layer 20 serves to improve the mechanical properties of the buffer layer, if it can be applied to acrylic resins or urethane resins, any one is not particularly limited and can be used, the filler is 0.001 It represents a particle size of from 50 to 50 micrometers, preferably consisting of one selected from the group consisting of polymethyl methacrylate, hydrocarbon, calcium carbonate and silica.

In this case, when polymethyl methacrylate or calcium carbonate is used as the filler, it is preferable to use a particle size of 1 to 50 micrometers, and when silica is used as the filler, particles of 0.001 to 50 micrometers are used. It is preferable to use what indicates the size.

In addition, the curing agent is preferably made of one selected from the group consisting of isocyanate, epoxy and chelate.

The adhesive layer 30 has a thickness of 10 to 200 micrometers on the upper and lower surfaces of the base layer 10 on which the buffer layer 20 is formed, and an acrylic resin or urethane resin having a storage modulus of 40000 to 90000 Pa. It is made by mixing 0.1 to 10 parts by weight of the curing agent in 100 parts by weight, but not only imparts adhesive performance to the disclosed double-sided tape, but also acrylic resin or urethane resin having excellent storage modulus is used so that the adhesive layer is not easily damaged by external force. It serves to prevent the double-sided tape from being easily separated from the adhesive object.

When the thickness of the adhesive layer 30 is less than 40 micrometers, the adhesive force or the fracture resistance of the adhesive layer 30 is lowered. When the thickness of the adhesive layer 30 exceeds 60 micrometers, the above effect is greatly improved. If the thickness of the double-sided tape is too thick, it is not preferable.

At this time, the storage modulus of the acrylic resin or urethane resin constituting the adhesive layer 30 is preferably less than or equal to the storage modulus of the acrylic resin or urethane resin applied to the buffer layer 20, the adhesive layer 30 When the storage elastic modulus of the acrylic resin or urethane resin constituting the resin is greater than the storage elastic modulus of the acrylic resin or urethane resin applied to the buffer layer 20, the fracture resistance of the double-sided tape is lowered.

At this time, the curing agent used in the pressure-sensitive adhesive layer is preferably made of one selected from the group consisting of isocyanate, epoxy and chelate.

In addition, the acrylic resin or urethane resin used in the buffer layer 20 or the adhesive layer 30 may be manufactured to have a desired storage modulus through the ratios shown in Table 1 below.

TABLE 1

As shown in Table 1 above, the storage modulus of the acrylic resin or urethane resin can be derived variously by controlling the mixing ratio and molecular weight of the monomer.

Hereinafter, the physical properties of the double-sided tape manufactured by the method of manufacturing a waterproof double-sided tape having excellent fracture resistance and the manufacturing method will be described with reference to Examples.

<Example 1>

A substrate layer is formed of a polyethylene terephthalate film having a thickness of 50 micrometers, 100 parts by weight of an acrylic resin having a storage modulus of 40000 Pa (TA Instruments, model AR2000 rheometer, condition 1 rad / s) on an upper surface of the substrate layer, A mixture of 5 parts by weight of a filler (polymethylmethacrylate having a particle size of 30 micrometers), 2 parts by weight of a curing agent (isocyanate) and 100 parts by weight of a solvent (methylethylketone) to a thickness of 50 micrometers using a comma coating machine Coating to form a buffer layer, 100 parts by weight of an acrylic resin having a storage modulus of 40,000 Pa, 2 parts by weight of a curing agent (isocyanate) and 100 parts by weight of a solvent (methyl ethyl ketone) on the upper and lower surfaces of the base layer on which the buffer layer is formed. It was coated to a thickness of 50 micrometers using a mixture comma coater made of a waterproof double-sided tape.

<Example 2>

Proceed in the same manner as in Example 1, by applying an acrylic resin having a storage modulus of 60000 Pa to the buffer layer and the adhesive layer to prepare a waterproof double-sided tape.

<Example 3>

Proceed in the same manner as in Example 1, an acrylic resin having a storage modulus of 90000 Pa was applied to the buffer layer and the adhesive layer to prepare a waterproof double-sided tape.

<Example 4>

Proceed in the same manner as in Example 1, using an acrylic resin having a storage modulus of 60000 Pa was applied to the buffer layer, and an acrylic resin having a storage modulus of 40000 Pa was applied to the adhesive layer to prepare a waterproof double-sided tape.

Example 5

Proceed in the same manner as in Example 1, an acrylic resin having a storage modulus of 90000 Pa was applied to the buffer layer, and an acrylic resin having a storage modulus of 40000 Pa was applied to the adhesive layer to prepare a waterproof double-sided tape.

<Example 6>

Proceed in the same manner as in Example 1, an acrylic resin having a storage modulus of 90000 Pa was applied to the buffer layer, and an acrylic resin having a storage modulus of 60000 Pa was applied to the adhesive layer to prepare a waterproof double-sided tape.

<Example 7>

Proceed in the same manner as in Example 1, a urethane resin having a storage modulus of 50000 Pa was applied to the buffer layer, and an acrylic resin having a storage modulus of 40000 Pa was applied to the adhesive layer to prepare a waterproof double-sided tape.

Comparative Example 1

Proceed in the same manner as in Example 1, an acrylic resin having a storage modulus of 30000 Pa was applied to the buffer layer and the adhesive layer to prepare a waterproof double-sided tape.

Comparative Example 2

Proceed in the same manner as in Example 1, an acrylic resin having a storage modulus of 40000 Pa was applied to the buffer layer, and an acrylic resin having a storage modulus of 60000 Pa was applied to the adhesive layer to prepare a waterproof double-sided tape.

Comparative Example 3

Proceed in the same manner as in Example 1, an acrylic resin having a storage modulus of 40000 Pa was applied to the buffer layer, and an acrylic resin having a storage modulus of 90000 Pa was applied to the adhesive layer to prepare a waterproof double-sided tape.

<Comparative Example 4>

Proceed in the same manner as in Example 1, an acrylic resin having a storage modulus of 60000 Pa was applied to the buffer layer, and an acrylic resin having a storage modulus of 90000 Pa was applied to the adhesive layer to prepare a waterproof double-sided tape.

Comparative Example 5

Proceed in the same manner as in Example 1, an acrylic resin having a storage modulus of 30000 Pa was applied to the buffer layer, and an acrylic resin having a storage modulus of 40000 Pa was applied to the adhesive layer to prepare a waterproof double-sided tape.

Comparative Example 6

Proceed in the same manner as in Example 1, applying a urethane resin having a storage modulus of 50000 Pa to the buffer layer, and applied to an acrylic resin adhesive layer having a storage modulus of 90000 Pa to prepare a waterproof double-sided tape.

Destructive resistance and waterproofness of the waterproof double-sided tape prepared through Examples 1 to 7 and Comparative Examples 1 to 6 were measured and shown in Table 2 below.

{However, fracture resistance was measured by extrusion load evaluation and drop separation evaluation.

Extrusion Load Evaluation-After cutting the waterproof double-sided tape into 15.5mm × 15.5mm, cut the inside 14.8mm × 14.8mm and cut a square frame sample with 0.7mm flesh. A tape sample was attached onto a polycarbonate (PC) plate of the same size as a 50 mm long 3.5 mm magnesium (Mg) plate, and then a 20 mm wide 20 mm long 2.8 mm thick glass plate was attached thereto. Thereafter, the prepared sample was allowed to stand at 24 ° C. for 30 minutes, and then obtained a load value (kgf) when the glass plate and the magnesium plate (or polycarbonate plate) were separated while pressing with a pointed tip in a 10φ hole using a universal tensile tester. did. The value thus obtained indicates the degree (resistance) of the double-sided tape to withstand a given force from the outside, and the higher the value, the better the fracture resistance.

Drop Separation Evaluation-After cutting the waterproof double-sided tape into 48mm × 48mm, cut the inside of the horizontal 47.3mm × 47.3mm, prepare a sample of 0.7mm in width, and then prepare 60mm × 60mm × 6.5mm thick aluminum (Al A sample was attached onto the plate and a glass plate of 50 mm long by 50 mm long and 2.8 mm thick was attached. The prepared sample was allowed to drop freely for 1.5 m after being left at 24 ° C. for 30 minutes, and then repeatedly dropped until the aluminum plate and the glass plate were separated. The adhesive residue was obtained by checking the number of times when the aluminum plate and the glass plate were separated and the degree of the adhesive remaining on the separating surface, and the adhesive component constituting the adhesive layer of the waterproof double-sided tape on the aluminum plate or the glass plate was found on only one side. If present, the residue was marked as 0%, and if the adhesive was present on both sides of the aluminum plate and the glass plate because the tape was broken, the residue was marked as 100%. The more the number of drops falling until the separation and the residue is closer to 0%, the better the fracture resistance of the waterproof double-sided tape.

In addition, after the waterproof double-coated tape was cut into 48 mm × 48 mm lengths, the inside was cut into 47.3 mm × 47.3 mm widths, and a 0.7 mm-thick square frame sample was prepared.Then, 60 mm × 60 mm × 6.5 mm magnesium ( A sample was attached onto a polycarbonate (PC) plate of the same size as the Mg) plate, and a glass plate 50 mm x 50 mm x 2.8 mm thick was attached. After the prepared sample was left at 24 ° C. for 72 hours, water was placed in a water tank filled with 2 m height, and after 144 hours, the samples were collected to visually check whether water leaked or not. Leak-free samples are labeled Pass and leaky samples are labeled NG.}

TABLE 2

As shown in Table 2 above, it can be seen that the waterproof double-coated tape produced through the disclosed Examples 1 to 7 has excellent fracture resistance and waterproof performance, compared to the waterproof double-coated tape prepared through Comparative Examples 1 to 6.

Therefore, the disclosed waterproof double-coated tape having excellent fracture resistance not only has excellent waterproof performance, but also a buffer layer and an adhesive layer containing a resin having excellent storage modulus are formed, thereby exhibiting excellent fracture resistance.

10; Substrate layer
20; Buffer layer
30; Adhesive layer

Claims (6)

Base layer;
A buffer layer formed on one surface of the base layer, the buffer layer including 100 parts by weight of an acrylic resin or a urethane resin having a storage modulus of 40000 to 90000 Pa, 0.1 to 10 parts by weight of a filler, and 0.1 to 10 parts by weight of a curing agent; And
An adhesive layer formed on upper and lower surfaces of the base layer on which the buffer layer is formed; Made of
The filler has a particle size of 0.001 to 50 micrometers, and consists of one selected from the group consisting of polymethylmethacrylate, hydrocarbons, calcium carbonate and silica,
The adhesive layer is a waterproof double-coated tape having excellent fracture resistance, characterized in that the storage elastic modulus is composed of 100 parts by weight of acrylic resin or urethane resin of 40000 to 90000 Pa and 0.1 to 10 parts by weight of a curing agent.
The method according to claim 1,
The base layer is a waterproof double-sided tape having excellent fracture resistance, characterized in that consisting of polyethylene terephthalate having a thickness of 25 to 100 micrometers.
delete delete The method according to claim 1,
The buffer layer is a waterproof double-sided tape having excellent fracture resistance, characterized in that formed in a thickness of 10 to 200 micrometers.
The method according to claim 1,
The adhesive layer is a waterproof double-sided tape having excellent fracture resistance, characterized in that formed in a thickness of 10 to 200 micrometers.

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