KR100912631B1 - Double-side adhesive tape having multilayer structure and method for manufacturing thereof - Google Patents

Abstract

A double-side adhesive tape having a multilayer structure is provided to improve tensile strength, to ensure excellent productivity due to little positional modification in autoclave processing, and to maintain a precise shape upon high-speed cutting. A double-side adhesive tape having a multilayer structure comprises a transparent polymer layer(110) which has an average molecular weight of 30,000-300,000 and a polyvinyl butyral with a butyral content of 75-90 weight%; and a first adhesive layer(120) and a second adhesive layer(130) which are formed on both surfaces of the transparent polymer layer. The transparent polymer layer further includes an acrylic polymer with an average molecular weight of 300,000-2,000,000.

Description

Optical double-sided adhesive tape having multilayer structure and method for manufacturing thereof

The present invention relates to an adhesive tape and a method for manufacturing the same, and more particularly, to form a transparent polymer layer including polyvinyl butyl al having excellent heat resistance, optical properties, and mechanical strength, and to form an acrylic pressure-sensitive adhesive layer on at least one surface of the transparent polymer layer. The formed double-sided adhesive tape for optics of the formed multilayer structure, and its manufacturing method are related.

Recently, the market for small LCDs and large displays with touch screen function is gradually increasing.

For example, an F / G type touch panel is used. The touch panel is a transparent conductive plastic film having a conductive layer such as indium tin oxide (ITO) formed on one side of a polyethylene terephthalate (PET) film. It is laminated | stacked on the conductive glass by.

In addition, F / F / P type touch panels are used. The touch panel is disposed so that the conductive layers formed on two transparent conductive plastic films face each other, and are made of polycarbonate (PC), polymethyl methacrylate (PMMA), or the like through a transparent adhesive. Laminate on a plastic substrate.

The touch panel of the laminated structure is fixed by a double-sided adhesive tape formed on the LCD module, the conventional double-sided adhesive tape is a cross-linking curing of the adhesive through a method of evaporating and coating the organic solvent present in the adhesive solution and light irradiation The method of coating was used.

The product thus produced was formed of an inorganic material composed of polymer adhesive only because it requires optically stable high transparency, low haze and high weather resistance.

However, the conventional adhesive tape has a weak mechanical strength such as tensile strength because the structure itself is composed only of the adhesive layer, and thus it is not easy to handle the adhesive tape when the adhesive tape is bonded to an optical substrate such as a transparent plastic substrate.

In addition, the conventional adhesive tape is adhered to the optical substrate, and then subjected to a vacuum autoclave process. At this time, since the tensile strength of the adhesive tape is weak, the adhesive layer flows toward the bubble-free side and protrudes from the existing layer to the side of the optical substrate. Or failure to fill the curved layer well. That is, a problem arises that the pressure-sensitive adhesive layer increases during the vacuum autoclave treatment and deviates from the initial position, and thus the incidence of adhesion failure between the substrate and the substrate is high.

In addition, the conventional adhesive tape has a weak mechanical strength, such as tensile strength, it is difficult to maintain a precise shape during high-speed punching. Therefore, there is a problem in that it is difficult to produce a large amount in the part requiring the optical characteristics of the small precision portable device and the defect rate is high.

The present invention devised to solve the problems of the prior art as described above forms a transparent polymer layer containing polyvinyl butyl al excellent in heat resistance, optical properties and mechanical strength, and an acrylic pressure-sensitive adhesive layer on at least one surface of the transparent polymer layer By forming, the self-tension strength of the adhesive tape is improved, so that it is easy to handle, and there is little positional deformation during autoclaving process, so it is excellent in productivity. An object of the present invention is to provide an optical double-sided adhesive tape having a multi-layered adhesive property and a method of manufacturing the same.

The object of the present invention is a weight average molecular weight of 30,000 to 300,000, the transparent polymer layer containing a polyvinyl butyl al content of 75% to 90% by weight of butyl al; And it is achieved by the optical double-sided adhesive tape of a multi-layer structure comprising a first adhesive layer and a second adhesive layer formed on both sides of the transparent polymer layer.

In addition, the transparent polymer layer of the present invention further comprises a polymer acrylic polymer having a weight average molecular weight of 300,000 to 2 million, the polymer acrylic polymer is preferably included 0.01 part by weight to 70 parts by weight based on 100 parts by weight of the transparent polymer layer. Do.

In addition, the thickness of the transparent polymer layer of the present invention is preferably 1㎛ to 400㎛.

In addition, it is preferable that the thickness of the said adhesive layer of this invention is 1 micrometer-1000 micrometers.

In addition, the other object of the present invention is a transparent polymer solution containing polyvinyl butyl al having a weight average molecular weight of 30,000 to 300,000 on one surface of the first peeling liner, and the content of butyl al to 75% to 90% by weight. Coating to form a transparent polymer layer; Applying a pressure-sensitive adhesive on one surface of the transparent polymer layer and drying it to form a first adhesive layer; Forming a second peeling liner on top of the first adhesive layer; Applying a pressure-sensitive adhesive and heating and drying the other peeling liner on the other side of the transparent polymer layer to form a second adhesive layer; And it is achieved by the optical double-sided adhesive tape manufacturing method of a multi-layer structure comprising the step of forming a third release liner on top of the second adhesive layer.

In addition, the pressure-sensitive adhesive of the present invention is preferably formed by mixing 0.01 parts by weight to 0.5 parts by weight of the crosslinking agent and 0.05 parts by weight to 10 parts by weight of the silane coupling agent to 100 parts by weight of the polymer acrylate copolymer pressure-sensitive adhesive solution.

In addition, the polymer acrylate copolymer pressure-sensitive adhesive solution of the present invention is 40 to 80 parts by weight of butyl acrylate, 20 to 40 parts by weight of 2-ethylhexyl acrylate, 5 to 15 parts by weight of acrylic acid, 2,2 ' It is preferable that it is formed by reacting 0.05 part by weight to 0.5 part by weight of azobisisobutylonitrile.

In addition, the pressure-sensitive adhesive of the present invention is preferably formed by solution polymerization or photopolymerization.

Accordingly, the optical double-sided pressure-sensitive adhesive tape of the multi-layered structure of the present invention forms a transparent polymer layer containing polyvinyl butylal having excellent heat resistance, optical properties and mechanical strength, and by forming an acrylic pressure-sensitive adhesive layer on at least one surface of the transparent polymer layer. It is easy to handle because the tensile strength is improved compared to the adhesive tape of the existing single structure, which can reduce the defects caused by the operator.The positional deformation during the autoclaving process is good, and the productivity is excellent. There is an effect that can be bonded while maintaining.

In addition, the present invention has an effect that the transparent polymer layer has a strong peel adhesive force and a high adhesive strength than the inorganic double-sided adhesive tape because it serves to support when peeling with the adhesive.

The terms or words used in this specification and claims are not to be construed as being limited to their ordinary or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best describe their invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of an optical double-sided adhesive tape of a multilayer structure according to the present invention.

The optical double-sided adhesive tape of the multilayer structure according to the present invention includes a transparent polymer layer 110, a first adhesive layer 120 and a second adhesive layer 130, the adhesive tape in the adhesive process with the optical substrate In order to facilitate handling and to solve problems occurring during the bonding process, the transparent polymer layer 110 formed of polyvinyl butylal (Polyvinylbutiral, PVB) having excellent optical properties and mechanical strength is formed.

The transparent polymer layer 110 includes a high heat-resistant polyvinyl butyl al having a weight average molecular weight of 30,000 to 300,000, wherein the content of butyl al in the polyvinyl butyl al is 75% to 90% by weight, and glass transition The temperature is 60 ° C to 80 ° C.

Generally, polyvinyl butylal is used for impregnating adhesion of structural fabrics in combination with safety glass production and thermosetting resins, but it has not been used as optical adhesive tapes and adhesive sheets. However, according to the present invention, by using polyvinyl butyl al having excellent optical properties and mechanical strength in the adhesive tape, the self-strengthening strength of the adhesive tape is increased, so that it is easy to handle, thereby reducing defects. It has little productivity and is excellent, it is possible to maintain the precise shape at the time of high speed punching, and it is possible to obtain the effect of having strong peeling adhesion.

In addition, the transparent polymer layer 110 may include a high heat-resistant polyvinyl butyl al having a weight average molecular weight of 30,000 to 300,000 and a polymer acrylic polymer having a weight average molecular weight of 300,000 to 2 million.

At this time, the polymer acrylic polymer is preferably included 0.01 parts by weight to 70 parts by weight based on 100 parts by weight of the transparent polymer layer. That is, the transparent polymer layer 110 may include 30 parts by weight to 99.99 parts by weight of polyvinyl butylal and 0.01 parts by weight to 70 parts by weight of the polymer acrylic polymer. It is not preferable because it is lowered.

The use of the polymer acrylic polymer causes the adhesion between the transparent polymer layer 110 and the pressure-sensitive adhesive to rise as with the polyvinyl butyl al. Therefore, the transparent polymer layer 110 and the pressure-sensitive adhesive layer 120 is not easily separated. In addition, the polymer acrylic polymer has the effect of preventing the occurrence of warpage of the adhesive tape because it cures the shrinkage.

The optical properties of the transparent polymer layer 110 thus formed are preferably 80% or more in transmittance, 2% or less in haze, and 1 μm to 400 μm in thickness.

The first adhesive layer 120 and the second adhesive layer 130 are formed on both sides of the transparent polymer layer 110, respectively, and the acrylic adhesive including the polymer acrylate copolymer adhesive on the transparent polymer layer 110 is fixed. It is formed by applying in a thickness, the thickness of the pressure-sensitive adhesive layer (120, 130) is preferably 1㎛ to 1000㎛.

In this case, the acrylic pressure-sensitive adhesive used may be a permanent or rework pressure-sensitive adhesive according to the use, it may be prepared by solution polymerization or photopolymerization.

In addition, the polymer acrylate copolymer adhesive has high optical transmittance and low haze and is stable under various physical conditions, and in particular, there is no lifting or bubble generation after adhesion with the optical substrate in heat and moisture resistance, and long-term UV exposure condition. It is preferable that there is no phenomenon of optical discoloration even in. In addition, the polymer acrylate copolymer pressure-sensitive adhesive preferably absorbs shock even after continuous surface touch, and there is no lifting or deformation.

2 to 4 illustrate a method for manufacturing optical double-sided adhesive tape of a multilayer structure according to the present invention.

First, the present invention forms a transparent polymer layer 110 by coating a transparent polymer solution on the first release liner 100 and heat drying (FIG. 2). In this case, the first peeling liner 100 may be PET, PC, or the like, and the transparent polymer solution is coated such that the transparent polymer layer 110 coated on the first peeling liner 100 has a thickness of 1 μm to 400 μm. Do. And after the coating is dried by heating for 1 to 10 minutes at 100 ℃ to 140 ℃.

The transparent polymer solution had a weight average molecular weight of 30,000 to 300,000, and polyvinyl butyl having a content of butyl alcohol of 75% to 90% by weight was added to a mixed solvent of ethyl acetate and ethyl alcohol for 2 hours at 40 ° C to 80 ° C. It is preferably formed by melting for 4 hours, and the solid content concentration is preferably 5% by weight to 55% by weight. Of course, other suitable solvents may be used in addition to the above solvents.

In addition, the transparent polymer solution includes a polyvinyl butyl al having a weight average molecular weight of 30,000 to 300,000 and a polymer acrylic polymer having a weight average molecular weight of 300,000 to 2 million. In the transparent polymer solution, polyvinyl butyl alcohol was added to an ethyl acetate and ethyl alcohol mixed solvent and melted at 40 ° C. to 80 ° C. for 2 hours to 4 hours, and then a polymer acrylic polymer was added at 0.5 ° C. to 80 ° C. for 2 hours. It is formed by dissolving in time, and it is preferable that solid content concentration is 5 to 55 weight%. At this time, the polymer acrylic polymer is preferably included 0.01 parts by weight to 70 parts by weight based on 100 parts by weight of the transparent polymer layer.

When the transparent polymer layer 110 is formed on the first release liner 100 as described above, an adhesive is applied to one surface of the transparent polymer layer 110 to form the first adhesive layer 120 (FIG. 3).

At this time, by heating and drying for 1 to 10 minutes at 80 ℃ to 120 ℃ to form a first adhesive layer 120 and a second peeling liner 140. In addition, while the first adhesive liner 100 is not formed on the opposite side of the transparent polymer layer 110, the second adhesive layer 130 is further formed while the first release liner 100 is removed, and the third release liner 150 is formed. ) (FIG. 4).

The pressure-sensitive adhesive according to the present invention includes a polymer acrylate copolymer pressure-sensitive adhesive, 0.01 parts by weight to 0.5 parts by weight of a crosslinking agent, and 0.05 parts by weight to 10 parts by weight of a silane coupling agent based on 100 parts by weight of the polymer acrylate copolymer pressure-sensitive adhesive solution. To form.

The polymer acrylate copolymer pressure-sensitive adhesive solution is 40 to 80 parts by weight of butyl acrylate, 20 to 40 parts by weight of 2-ethylhexyl acrylate, 5 to 15 parts by weight of acrylic acid, and 2,2'-azobisisobutyl Nitrile 0.05 parts by weight to 0.5 parts by weight is formed by reaction, wherein the reaction temperature is 40 ℃ to 80 ℃, the reaction time is preferably 8 hours to 16 hours.

The structure thus formed is aged at 40 ° C. to 80 ° C. for 40 to 60 hours, thereby forming a multilayered double-sided adhesive tape for optics.

Hereinafter, a method of preparing the polymer acrylate copolymer pressure sensitive adhesive solution and the transparent polymer solution will be described in more detail. The present invention is not limited by these examples.

[ Manufacture of Polymer Acrylate Copolymer Adhesive Solution]

60 parts by weight of butyl acrylate, 29 parts by weight of 2-ethylhexyl acrylate, 11 parts by weight of acrylic acid, 0.1 part of 2,2'-azobisisobutylonitrile as a polymerization initiator, and ethyl acetate 120 as a solvent. Weigh parts into a round flask. The polymer is heated to 80 ° C. to allow the solvent to circulate through the cooler to remove oxygen present in the polymer. Then, the temperature of the reactor was lowered to 60 ° C. and an initiator was added to react for 12 hours to obtain a polymer acrylate copolymer adhesive solution (acrylic adhesive solution) having a solid content concentration of 25% by weight. At this time, the weight average molecular weight of the acrylate copolymer adhesive is 1 million.

[Production of Polyvinyl Butyl Al Transparent Polymer Solution A]

In the reactor, 20 parts by weight of polyvinyl butyl al (sekisui chemical company S-LEC BH-S weight average molecular weight 60,000), a heat-resistant polymer, is added to 80 parts by weight of a mixed solvent of ethyl acetate and ethyl alcohol. The polymer is then reacted at 60 ° C. for 3 hours to prepare a polyvinylbutylal series transparent polymer solution (polyvinylbutylal series solution A) having a solid content concentration of 20% by weight.

[Production of Polyvinyl Butyl Al Transparent Polymer Solution B]

16 parts by weight of a polyvinyl butyl al (sekisui chemical company S-LEC BH-S weight average molecular weight 60,000), a heat-resistant polymer, was added to 64 parts by weight of a mixed solvent of ethyl acetate and ethyl alcohol and reacted at 60 ° C. for 3 hours. . 20 parts by weight of a polymer acrylic polymer solution (20 wt% of NPTACK-450 weight average molecular weight of 1 million solids by Nanoploytec Co., Ltd.) was dissolved at 60 ° C. for 1 hour, and a polyvinyl butyral transparent polymer solution having a total solid concentration of 20 wt% was used. (Polyvinyl Butyl Al Solution B) was prepared.

[Production of polyvinyl butyl al type transparent polymer solution C]

10 parts by weight of polyvinyl butyl al (sekisui chemical company S-LEC BH-S weight average molecular weight 60,000), a heat-resistant polymer, was added to 40 parts by weight of a mixed solvent of ethyl acetate and ethyl alcohol and reacted at 60 ° C. for 3 hours. . In this solution, 50 parts by weight of a polymer acrylic polymer solution (Nanoploytec Co., Ltd. NPTACK-450 weight average molecular weight 1 million solids 20% by weight) was dissolved at 60 ° C. for 1 hour, and a polyvinyl butyral transparent polymer solution having a total solid concentration of 20% by weight. (Polyvinyl Butyl Al Solution C) was prepared.

Hereinafter, the method of manufacturing an adhesive tape using the said resin composition is demonstrated concretely. The present invention is not limited by these examples.

Example 1

Example 1 according to the present invention is coated with a polyvinyl butyl al-based solution A on a release liner, and dried by heating at 120 ℃ for 4 minutes to form a transparent polymer layer. At this time, the final thickness of the PET film layer and the transparent polymer layer is to be 7㎛.

Moreover, with respect to 100 weight part of polymer acrylate copolymer adhesive solutions, 0.05 weight part of brand names TKA-100P (Asai Kasei, HDI Trimer) as a crosslinking agent, and a brand name A-174 (GE silicone, methacryloxysilane) 0.2 as a silane coupling agent An acrylic pressure-sensitive adhesive solution was prepared by mixing parts by weight.

After drying the acrylic pressure-sensitive adhesive solution on one side of the transparent polymer layer is applied so that the thickness of the pressure-sensitive adhesive layer is 9㎛, and dried by heating at 100 ℃ for 4 minutes to form an adhesive layer. And a peeling liner is formed on the adhesive layer. Then, the acrylic pressure-sensitive adhesive solution was applied to the transparent polymer layer without the pressure-sensitive adhesive layer while the release liner was removed so that the thickness of the pressure-sensitive adhesive layer was 9 μm, and dried at 100 ° C. for 4 minutes to form the pressure-sensitive adhesive layer on the other side, A peeling liner is formed on the adhesive layer.

 Lastly, the formed face pressure-sensitive adhesive tape is aged at 60 ° C. for 48 hours to prepare an optical double-sided pressure-sensitive adhesive tape having a multilayer structure for touch panels.

Example 2

In Example 2 according to the present invention, the polyvinyl butyl al-based solution B is coated on a release liner, and heated and dried at 120 ° C. for 4 minutes to form a transparent polymer layer. At this time, the final thickness of the PET film layer and the transparent polymer layer is to be 7㎛.

In addition, the pressure-sensitive adhesive solution was prepared in the same manner as in Example 1, and dried on one side of the transparent polymer layer and then applied so that the thickness of the pressure-sensitive adhesive layer was 9 μm, followed by heat drying at 100 ° C. for 4 minutes to form a pressure-sensitive adhesive layer, A peeling liner is formed on the adhesive layer. Then, after drying on the opposite side of the transparent polymer layer where the pressure-sensitive adhesive layer was not formed, the pressure-sensitive adhesive solution was applied while removing the release liner so that the thickness of the pressure-sensitive adhesive became 9 μm, and dried by heating at 100 ° C. for 4 minutes to form a pressure-sensitive adhesive layer. A release liner is formed on the layer.

 Lastly, the formed face pressure-sensitive adhesive tape is aged at 60 ° C. for 48 hours to prepare an optical double-sided pressure-sensitive adhesive tape having a multilayer structure for touch panels.

Example 3

In Example 3 according to the present invention, the polyvinylbutylal-based solution C is coated on a release liner, and heated and dried at 120 ° C. for 4 minutes to form a transparent polymer layer. At this time, the final thickness of the PET film layer and the transparent polymer layer is to be 7㎛.

In addition, the pressure-sensitive adhesive solution was prepared in the same manner as in Example 1, and dried on one side of the transparent polymer layer, and then applied so that the thickness of the pressure-sensitive adhesive layer was 9 μm, followed by heat drying at 100 ° C. for 4 minutes to form a pressure-sensitive adhesive layer, A peeling liner is formed on the adhesive layer. Then, the pressure-sensitive adhesive solution is applied so that the thickness of the pressure-sensitive adhesive layer is 9 µm after drying while removing the release liner on the opposite side of the transparent polymer layer on which the pressure-sensitive adhesive layer is not formed. Then, this was heated and dried at 100 ° C. for 4 minutes to form an adhesive layer, and a release liner was formed on the adhesive layer.

 Lastly, the formed face pressure-sensitive adhesive tape is finally aged at 60 ° C. for 48 hours to prepare an optical double-sided pressure-sensitive adhesive tape having a multilayer structure for a touch panel.

Example 4

Example 4 according to the present invention is coated on a polyvinyl butyl al-based solution B on a release liner, and dried by heating at 120 ℃ for 4 minutes to form a transparent polymer layer. At this time, the final thickness of the PET film layer and the transparent polymer layer is to be 12㎛.

In addition, the pressure-sensitive adhesive solution is prepared in the same manner as in Example 1, and then applied to one side of the transparent polymer layer so that the thickness of the pressure-sensitive adhesive layer is 9 µm. And it heat-dried at 100 degreeC for 4 minutes, an adhesive layer is formed in one side, and a peeling liner is formed on this adhesive layer. Then, after drying on the opposite side of the transparent polymer layer, the pressure-sensitive adhesive solution was applied while removing the release liner so that the thickness of the pressure-sensitive adhesive layer was 9 μm, and dried by heating at 100 ° C. for 4 minutes to form the pressure-sensitive adhesive layer on the other side, and the pressure-sensitive adhesive layer A release liner is formed on the phase.

 Lastly, the formed face pressure-sensitive adhesive tape is aged at 60 ° C. for 48 hours to prepare an optical double-sided pressure-sensitive adhesive tape having a multilayer structure for touch panels.

Example 5

Example 5 according to the present invention is coated on a polyvinyl butyl al-based solution B on a release liner, and dried by heating at 120 ℃ for 4 minutes to form a transparent polymer layer. At this time, the final thickness of the PET film layer and the transparent polymer layer is to be 20㎛.

Moreover, an adhesive solution is manufactured by the method similar to Example 1, and an adhesive solution is apply | coated so that the thickness of an adhesive layer may be 15 micrometers after drying to one side of a transparent polymer layer. And it heat-dried at 100 degreeC for 4 minutes, an adhesive layer is formed in one side, and a peeling liner is formed on this adhesive layer. Then, after drying on the opposite side of the transparent polymer layer, the pressure-sensitive adhesive solution was applied while removing the release liner so that the thickness of the pressure-sensitive adhesive layer was 15 μm, and dried at 100 ° C. for 4 minutes to form the pressure-sensitive adhesive layer on the other side, and the pressure-sensitive adhesive layer A release liner is formed on the phase.

 Lastly, the above face adhesive tape is aged at 60 ° C. for 48 hours to prepare an optical double-sided adhesive tape of a multilayer structure for a touch panel.

Comparative Example 1

Comparative Example 1 according to the present invention was prepared in the same manner as in Example 1, and coated on the corona-treated 12㎛ PET (substrate) one side so that the thickness of the pressure-sensitive adhesive layer is 9㎛. And it heat-drys at 100 degreeC for 4 minutes, an adhesive layer is formed and a peeling liner is formed on this adhesive layer. Then, after drying on the opposite side of PET, the pressure-sensitive adhesive solution is applied so that the thickness of the pressure-sensitive adhesive layer is 9 μm and dried by heating at 100 ° C. for 4 minutes to form the pressure-sensitive adhesive layer on the other side, and a release liner is formed on the pressure-sensitive adhesive layer. do.

Finally, the formed face adhesive tape is aged at 60 ° C. for 48 hours to prepare a double-sided adhesive tape for a touch panel.

Comparative Example 2

Comparative Example 2 according to the present invention was prepared in the same manner as in Example 1, and the adhesive solution is applied so that the thickness of the pressure-sensitive adhesive layer is 30㎛ after drying on one side of PET. And it heat-drys for 4 minutes at 100 degreeC, and forms a peeling liner on the adhesive layer.

In addition, the formed adhesive tape is aged at 60 ° C. for 48 hours to prepare an adhesive tape for a touch panel.

The transparency, precision punching property, adhesiveness, weather resistance, and shear strength of each transparent adhesive tape obtained in Examples 1 to 5 and Comparative Examples 1 to 2 were evaluated by the evaluation method.

Table 1 summarizes the structure and physical properties of the optical double-sided adhesive tape of the multilayer structure according to the embodiment of the present invention and the comparative example.

Example Comparative example One 2 3 4 5 One 2 Adhesive layer Kinds Acrylic pressure sensitive adhesive solution Acrylic pressure sensitive adhesive solution Acrylic pressure sensitive adhesive solution Acrylic pressure sensitive adhesive solution Acrylic pressure sensitive adhesive solution Acrylic pressure sensitive adhesive solution Acrylic pressure sensitive adhesive solution Thickness (㎛) 9 9 9 9 15 9 30 Transparent polymer layer Clear Polymer Solution Types A B C B B - - Thickness (㎛) 7 7 7 12 20 - - Kind of mention - - - - - PET PET Double sided adhesive tape Thickness (㎛) 25 25 25 30 50 30 30 Haze value (%) 0.6 0.6 0.6 0.6 0.7 1.2 0.6 Transmittance (%) 93 93 93 93 91.5 86 93 Precision punchability ○ ○ ○ ○ ○ ○ × Curl ○ ○ ○ ○ ○ ○ × Adhesive 1450 1400 1460 1310 1290 1120 1100 Weather resistance ○ ○ ○ ○ ○ ○ ○ Shear strength (g / ㎠) 500 500 500 700 920 1300 ×

(Transparency Evaluation Method)

Each adhesive tape was laminated on a highly transparent slide glass (manufactured by WATMEN Co., Ltd.) to prepare a test piece, and the haze value (%) and transmittance of the test piece were measured using a haze transmittance meter (`` HR-100 '' Murakami Color Technology Research Institute). Measure by

Weatherability Evaluation Method

Each adhesive tape was laminated on a 188 μm polyethylene terephthalate film (PET film) without interlayer bubbles, and then attached and fixed to a polycarbonate plate (PC plate) having a thickness of 1 mm, and then PET film / adhesive tape / PC plate. A test piece having a layer structure of was prepared. This test piece is put into an 80 degreeC oven for 48 hours, and a weather resistance test is completed. After the weathering test, visually check the adhesive interface (the interface between the adhesive layer and the polycarbonate plate) for bubbles or lifting, which are appearance defects.

(Bending prevention evaluation method)

Each adhesive tape was laminated on a 188 μm-thick polyethylene terephthalate film, and then attached and fixed to a polycarbonate plate (PC plate) having a thickness of 1 mm to prepare a test piece having a layer structure of PET film / adhesive tape / PC plate. do. The test piece was placed in a constant temperature and humidity chamber at 70 ° C. for 95 hours, and then taken out. The warpage state of the PC board was visually observed to observe whether warpage occurred. At this time, if warping does not occur, o is displayed.

(Adhesive Evaluation Method)

After each adhesive tape was laminated on a 25-micrometer-thick polyethylene terephthalate film (PET film), the test piece was made so that it might become 25 mm in width and 200 mm in length. The test piece is attached and fixed to a polycarbonate plate (PC plate) of 3 mm thickness by using a hand roller of 2 kg weight so as not to enter air bubbles. After 30 minutes, the adhesiveness was evaluated at 180 ° using a universal testing machine (LLODY 15K, UK), and the unit of the value was g / 25 mm.

Shear strength evaluation

After making each test tape with 20mm × 50mm, put 20mm × 20mm on the upper and lower jig of universal testing machine (LLODY 15K, UK) and pull it at 50mm / min per minute to break the adhesive tape. Measure the intensity of the time.

(Precise punchability evaluation)

After each adhesive tape was punched out according to the punching shape for a mobile phone by a die-cutting device, the cutting state and the positional deformation of the cut section were determined through an objective optical microscope.

As described in Examples 1 to 5 of Table 1, the present invention forms a transparent polymer layer containing polyvinylbutylal and a polymer acrylic polymer having excellent heat resistance, optical properties, and mechanical strength, which are not used in Comparative Examples 1 to 2. The optical double-sided adhesive tape of the multilayered structure which has a low haze value, a high transmittance | permeability, and was excellent in precision punchability can be produced by this.

Although the present invention has been shown and described with reference to the preferred embodiments as described above, it is not limited to the above embodiments and those skilled in the art without departing from the spirit of the present invention. Various changes and modifications will be possible.

1 is a cross-sectional view of an optical double-sided adhesive tape of a multi-layer structure according to the present invention,

2 to 4 is a manufacturing process diagram of the optical double-sided adhesive tape of the multi-layer structure according to the present invention.

<Description of the symbols for the main parts of the drawings>

110: transparent polymer layer 120: first adhesive layer

130: second adhesive layer

Claims (15)

A transparent polymer layer comprising polyvinyl butyl al having a weight average molecular weight of 30,000 to 300,000 and a butyl al content of 75 to 90 wt%; And It includes a first adhesive layer and a second adhesive layer formed on both sides of the transparent polymer layer, The transparent polymer layer further comprises a polymer acrylic polymer having a weight average molecular weight of 300,000 to 2 million, The polymer acrylic polymer is a multilayer double-sided adhesive tape for a multilayer structure, characterized in that 0.01 to 70 parts by weight based on 100 parts by weight of the transparent polymer layer. delete delete The method of claim 1, The thickness of the transparent polymer layer is an optical double-sided adhesive tape having a multilayer structure of 1㎛ to 400㎛. The method of claim 1, The first adhesive layer and the second adhesive layer is an optical double-sided adhesive tape of a multilayer structure comprising a polymer acrylate copolymer adhesive. The method of claim 1, The thickness of the first adhesive layer and the second adhesive layer is a double-sided adhesive tape for optics having a multilayer structure of 1㎛ to 1000㎛. The method of claim 1, The first adhesive layer and the second adhesive layer is a double-sided adhesive tape for optics of a multi-layer structure is a permanent or rework adhesive. Forming a transparent polymer layer by coating a transparent polymer solution containing polyvinyl butyl al having a weight average molecular weight of 30,000 to 300,000 and a butylal content of 75% to 90% by weight on one surface of the first peeling liner ; Coating a first adhesive on one surface of the transparent polymer layer and heating and drying the first adhesive layer to form a first adhesive layer; Forming a second peeling liner on top of the first adhesive layer; Forming a second adhesive layer by applying a second adhesive and heating to the other side of the transparent polymer layer while removing the first release liner; And Forming a third release liner on top of the second adhesive layer Optical double-sided adhesive tape manufacturing method of a multi-layer structure comprising a. The method of claim 8, The transparent polymer solution is a multilayer double-sided adhesive tape manufacturing method of a multi-layer structure formed by further comprising a polymer acrylic polymer having a weight average molecular weight of 300,000 to 2 million. The method of claim 9, The transparent polymer solution is 30 parts by weight to 99 parts by weight of the polyvinyl butylal, the polymer acrylic polymer is 1 part to 70 parts by weight of the optical double-sided adhesive tape manufacturing method formed. The method of claim 8, The transparent polymer layer is a multilayer double-sided adhesive tape manufacturing method of a multi-layer structure formed to a thickness of 1㎛ to 400㎛. The method of claim 8, The first adhesive and the second adhesive is a multi-sided optical double-sided structure formed by mixing 0.01 parts by weight to 0.5 parts by weight of the crosslinking agent and 0.05 parts by weight to 10 parts by weight of the silane coupling agent to 100 parts by weight of the polymer acrylate copolymer pressure-sensitive adhesive solution Adhesive tape manufacturing method. The method of claim 12, The polymer acrylate copolymer pressure-sensitive adhesive solution is 40 to 80 parts by weight of butyl acrylate, 20 to 40 parts by weight of 2-ethylhexyl acrylate, 5 to 15 parts by weight of acrylic acid, 2,2'-azobisisobutyl Method for producing a double-sided pressure-sensitive adhesive tape for optics of a multilayer structure formed by reacting a nitrile 0.05 part by weight to 0.5 part by weight. The method of claim 12, The first adhesive and the second adhesive is a multi-layered optical adhesive tape manufacturing method of a multi-layer structure is formed by solution polymerization or photopolymerization. The method of claim 8, The first adhesive and the second adhesive is a method of manufacturing a double-sided adhesive tape for optics of a multi-layer structure formed to a thickness of 1㎛ to 1000㎛.

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