KR20200058049A - Adhesive tape and method for manufacturing method thereof same - Google Patents

Abstract

The present invention relates to a method of manufacturing an adhesive tape, and an adhesive tape manufactured by using the same, in which the method of manufacturing the adhesive tape includes: forming a first liquid adhesive layer on a surface of a first carrier film; forming a second liquid adhesive layer on a surface of a second carrier film; lowering fluidity of an opposite side of a surface of the first liquid adhesive layer opposite to the first carrier film so as to form a part of the first liquid adhesive layer in a thickness direction as a first adhesive skin layer; lowering fluidity of an opposite side of a surface of the second liquid adhesive layer opposite to the second carrier film so as to form a part of the second liquid adhesive layer in the thickness direction as a second adhesive skin layer; and forming a stacked body in which the first carrier film, the first liquid adhesive layer, the first adhesive skin layer, a liquid substrate layer, the second adhesive skin layer, the second liquid adhesive layer, and the second carrier film are sequentially provided such that the liquid substrate layer is disposed between the first adhesive skin layer and the second adhesive skin layer.

Description

Adhesive tape and manufacturing method therefor {ADHESIVE TAPE AND METHOD FOR MANUFACTURING METHOD THEREOF SAME}

The present invention relates to an adhesive tape and a method for manufacturing the same.

Adhesive tapes used in automobiles can be exposed to ultraviolet light (UV) and rainwater for a long time, and must withstand external physical shock or vibration. In this regard, research is being conducted on an adhesive tape comprising an adhesive layer in which the adhesive composition is cured.

However, when the step of curing the raw material of the adhesive tape including the adhesive composition proceeds in the liquid phase, a problem arises that it is difficult to accurately control the thickness of each layer. In order to control the thickness of each raw material layer, a process of increasing the viscosity of the pressure-sensitive adhesive composition or separately curing the pressure-sensitive adhesive composition is required. However, when the viscosity of the pressure-sensitive adhesive composition is increased, there are limitations in the pressure and compounding process, and when adding a process for curing separately, there is a problem in the economic efficiency of the manufacturing process.

Republic of Korea Publication No. 2004-0101384

This specification is intended to provide a method for manufacturing an adhesive tape having easy thickness control and economical efficiency.

The present specification is a step of forming a first liquid adhesive layer on the surface of the first carrier (carrier) film; Forming a second liquid adhesive layer on the surface of the second carrier film; Lowering the fluidity of the opposite side of the surface of the first liquid adhesive layer opposite to the first carrier film, thereby forming a portion of the first liquid adhesive layer in a thickness direction as a first adhesive skin layer; Lowering the fluidity of the opposite side of the surface of the second liquid pressure-sensitive adhesive layer opposite to the second carrier film, thereby forming a part of the second liquid pressure-sensitive adhesive layer in a thickness direction as a second pressure-sensitive adhesive skin layer; The first carrier film, the first liquid adhesive layer, the first adhesive skin layer, the liquid substrate layer, the second adhesive skin layer, the upper agent so that the liquid substrate layer is disposed between the first adhesive skin layer and the second adhesive skin layer 2 forming a laminate in which the liquid adhesive layer and the second carrier film are sequentially provided; And it provides a method for producing an adhesive tape comprising the step of curing the laminate.

This specification is the first carrier film; A first liquid adhesive layer; A first adhesive skin layer; Liquid base layer; A second adhesive skin layer; An upper second liquid adhesive layer; And a second carrier film sequentially provided.

In addition, the present specification provides an adhesive tape manufactured by the above-described manufacturing method.

Due to the manufacturing method according to an exemplary embodiment of the present specification, the thickness of the adhesive tape is easy to control.

In addition, due to the manufacturing method according to the exemplary embodiment of the present specification, it is possible to manufacture the adhesive tape by the one-path system, which is economical in the manufacturing process.

1 is a view schematically showing a method of manufacturing an adhesive tape according to the present invention.
2 is a view schematically showing a sequence of a laminate according to the present invention.
3 is an SEM image of a tape manufactured by a conventional manufacturing method.
4 and 5 are SEM images of tapes produced by the manufacturing method of the present invention.

Hereinafter, preferred embodiments of the present invention will be described. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. In addition, embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art.

In the present invention, the fact that two or more elements are sequentially provided, for example, the term “A and B sequentially provided”, the elements A and B are arranged in the above order, and are different between A and B. When elements are interposed, it is also included, for example, when A and B and C are arranged in the above order.

In the present specification, when a part “includes” a certain component, it means that the component may further include other components, rather than excluding other components, unless otherwise specified.

In an exemplary embodiment of the present specification, forming a first liquid pressure-sensitive adhesive layer on the surface of the first carrier film; Forming a second liquid adhesive layer on the surface of the second carrier film; Lowering the fluidity of the opposite side of the surface of the first liquid adhesive layer opposite to the first carrier film, thereby forming a portion of the first liquid adhesive layer in a thickness direction as a first adhesive skin layer; Lowering the fluidity of the surface opposite to the surface opposite to the second carrier film of the second liquid pressure-sensitive adhesive layer to form a part of the second liquid pressure-sensitive adhesive layer in a thickness direction as a second pressure-sensitive adhesive skin layer; The first carrier film, the first liquid adhesive layer, the first adhesive skin layer, the liquid substrate layer, the second adhesive skin layer, the upper agent so that the liquid substrate layer is disposed between the first adhesive skin layer and the second adhesive skin layer 2 forming a laminate in which the liquid adhesive layer and the second carrier film are sequentially provided; And it provides a method for producing an adhesive tape comprising the step of curing the laminate. Through the process of lowering the fluidity, the thickness variation of each layer can be minimized, and since the pressure-sensitive adhesive layer is not completely cured, there is an advantage that it can be efficiently manufactured in a single pass system without a separate pressure-sensitive adhesive layer curing process. In addition, by improving the non-uniformity of each layer, it is possible to reduce manufacturing cost and ensure uniformity of adhesive properties. 2 shows the lamination order of the laminates.

In the present specification, the one-path system means that all processes can be processed from one equipment without additional equipment.

In the present specification, the thickness direction means a stacking direction.

The first carrier film and the second carrier film, when laminating the raw materials of the adhesive tape, as a base, has excellent heat resistance, and after the process, it is easy to detach from the pressure-sensitive adhesive layer can be used commonly used.

In the present invention, the thickness of the first carrier film and the second carrier film may be about 20㎛ to 60㎛, preferably 25㎛ to 50㎛. If the thickness of the carrier film is too thin, problems such as wrinkles and scratches may occur, and if it is too thick, it is inefficient in the process.

The carrier film may be a transparent carrier film. As the type of the carrier film, a polyethylene phthalate (PET) film, a polypropylene (PP) film, a polyethylene (PE) film, etc. may be used, and preferably a PET film may be used, but is not limited thereto.

In one embodiment of the present invention, the first liquid pressure-sensitive adhesive layer and the second liquid pressure-sensitive adhesive layer may be formed using pressure-sensitive adhesives such as acrylic pressure-sensitive adhesive, silicone pressure-sensitive adhesive, epoxy pressure-sensitive adhesive, rubber-based pressure-sensitive adhesive. Preferably, an acrylic pressure sensitive adhesive and a rubber pressure sensitive adhesive, more preferably a mixed resin based on an acrylic polymer can be used as the pressure sensitive adhesive, but is not limited thereto.

In the present invention, the thickness of the first liquid adhesive layer and the second liquid adhesive layer before forming the first and second adhesive skin layers may be 10 μm to 100 μm, preferably 30 μm to 60 μm. When the thickness of the pressure-sensitive adhesive layer is within the above range, it is easy to form the pressure-sensitive skin layer, and it is easier to accurately adjust the thickness in the process.

In the present invention, the viscosity of the first liquid adhesive layer and the second liquid adhesive layer before forming the adhesive skin layer may be 2,000 cPs to 10,000 cPs, preferably 3,000 cPs to 6,000 cPs. Adhesive layer When it has the said viscosity range, it is easier to form an adhesive skin layer.

In one embodiment of the present invention, the step of forming the first adhesive skin layer and the second adhesive skin layer may be performed by a photocuring reaction by a lamp. As the lamp, any one of a black light lamp, a metal halide lamp, a mercury lamp, a low-pressure ultraviolet (UV) light, and an LED lamp may be used, and an LED lamp may be preferably used, but is not limited thereto.

In an exemplary embodiment of the present invention, the light amount of the lamp may be 1 mJ / cm 2 to 10 mJ / cm 2, preferably 1 mJ / cm 2 to 5 mJ / cm 2. When the photocuring reaction occurs in the light amount range, it is easy to form a semi-cured coating layer.

In one embodiment of the present invention, the time of the photocuring reaction may be 5 seconds or less. Considering a typical process speed, it is easy to form an adhesive skin layer within the time range.

In the present invention, lowering the fluidity of the pressure-sensitive adhesive layer means that the pressure-sensitive adhesive layer is semi-cured.

In addition, in the present invention, the adhesive skin layer means a portion semi-cured in the liquid adhesive layer. Due to the formation of the adhesive skin layer, it is possible to minimize the change in thickness between each layer that may occur in the process of forming the liquid base layer.

In one embodiment of the present invention, the thickness of each of the first and second adhesive skin layers is 10% or more and 80% or less, preferably 10%, based on each thickness of the first and second liquid adhesive layers It may be more than 60%.

In this specification, the thickness of the liquid adhesive layer and the adhesive skin layer can be checked in real time through an automatic thickness meter (Betaray CMS-Proline, manufacturer: Honeywall).

In one embodiment of the present invention, the liquid base layer may be a layer made of a polymer resin. The polymer resin may include at least one of polypropylene (PP), polyethylene terephthalate (PET) and polyvinyl chloride (PVC), but is not limited thereto. The liquid base layer may be formed by a conventional coating method such as a slot die, a commer coater.

In the present invention, the thickness of the liquid substrate layer may be about 50㎛ to 1500㎛, preferably 300㎛ to 800㎛. When the thickness range is satisfied, it is easy to transport using a carrier film. In addition, the base layer is usually made of a foam (Foam) or colored (Gray or Black) layer, so it is possible to visually distinguish the color difference at the interface when measuring a tomographic microscope.

In the present invention, the viscosity of the liquid base layer may be about 2,000 cPs to 20,000 cPs, preferably about 3,000 cPs to 10,000 cPs. When it has the viscosity range, it is easier to form a liquid substrate layer.

In one embodiment of the present invention, the step of curing the laminate may use a UV oven. The curing may mean UV curing. The UV curing may be made in a range of light amounts of 100 mJ / cm 2 or more and 1500 mJ / cm 2 or less, preferably 300 mJ / cm 2 or more and 1000 mJ / cm 2 or less. The speed of the process line is adjusted according to the amount of light, and due to the UV curing characteristics, the oven itself does not require heat conditions, but the oven may be periodically ventilated to prevent excessive heat generation.

In the present specification, the interlayer thickness and interface confirmation of the finished product can be confirmed through a tomography microscope (MX61-L, manufacturer: Olympus).

The manufacturing method according to an exemplary embodiment of the present invention may include a step of cutting the laminate after the step of curing the laminate. The cutting method can be applied to a conventional method. Specifically, after the curing step is completed, side cutting of the roll fabric is continuously performed, and the size of the roll fabric can be cut into small pieces in a winding unit conforming to product specifications.

The manufacturing method according to an exemplary embodiment of the present invention may include a step of sequentially or simultaneously peeling the first carrier film and the second carrier film from the laminate after the step of curing the laminate. .

The manufacturing method according to an exemplary embodiment of the present invention includes a step of curing the laminate, followed by cutting the laminate; And peeling the first carrier film and the second carrier film from the laminate.

The manufacturing method according to an exemplary embodiment of the present invention includes the steps of curing the laminate, and then peeling the first carrier film and the second carrier film from the laminate; And cutting the laminate.

The manufacturing method according to an exemplary embodiment of the present invention may be performed by a roll-to-roll process. This is a continuous process, which is advantageous for mass production. Figure 1 shows a schematic manufacturing process. The roll-to-roll process may include an alignment process. The alignment process is performed through a conventional method, through which the right and left balance and tension of the roll can be adjusted.

In the present invention, the device for transferring the carrier film is defined as a carrier film guide roll. In addition, an apparatus for stacking different layers is defined as a contact roll. The carrier film guide roll and the contact roll may use equipment commonly used in the field.

1 shows the production method of the present invention in more detail. The carrier film is transferred using guide rolls 1 and 2. The first carrier film is transferred using the first carrier film guide roll 1 and the second carrier film using the second carrier film guide roll 2. The first and second liquid adhesive layers are formed on the surfaces of the first and second carrier films transferred using liquid adhesive layer coating equipments 3 and 4, respectively. The first and second adhesive skin layers are semi-cured by semi-curing the surfaces in the thickness direction of the first and second liquid adhesive layers using low-pressure UV lamps or LED lamps 5 and 6 immediately after the formation of the first and second adhesive layers. To form. A first carrier film, a first liquid adhesive layer, a first by forming a liquid base layer on the first and second adhesive skin layer and passing between the first contact roll 7 and the second contact roll 8 An adhesive skin layer, a liquid substrate layer, a second adhesive skin layer, a second liquid adhesive layer, and a second carrier film are sequentially formed. Thereafter, the laminate is cured using a UV oven 9. As such, it is possible to secure the economics of the process by constructing an efficient one-path system. The conveyed speed may be 1 m / min to 30 m / min, but is not limited thereto.

According to an exemplary embodiment of the present invention, the first carrier film; A first liquid adhesive layer; A first adhesive skin layer; Base layer; A second adhesive skin layer; An upper second liquid adhesive layer; And a second carrier film sequentially provided. The above-described definition may be applied to each film and layer constituting the laminate.

According to an exemplary embodiment of the present invention, it is possible to provide an adhesive tape manufactured by the above-described manufacturing method. In the case of manufacturing with such a manufacturing method, it is possible to minimize variation in physical properties that may occur due to variation in thickness by minimizing variation in thickness between layers. That is, in the case of the conventional manufacturing method, the mixing section between each layer exists and the interface is non-uniform, but in the case of the manufacturing method of the present invention, a relatively uniform interface can be secured.

Hereinafter, the present specification will be described in more detail through examples. However, the following examples are only intended to illustrate the present specification and are not intended to limit the present specification.

<Comparative Example>

First and second liquid adhesives having a thickness of 0.05 mm, using a mixed resin mixed resin based on a viscosity of 5500 cPs and an acrylic polymer, respectively, without forming an adhesive skin layer, while performing the entire process on a carrier film at a line speed of 6 m / min. A layer was formed. Subsequently, a laminate was formed by direct multi coating so that a liquid substrate layer having a thickness of 0.7 mm of the acrylic polymer component was placed between the first and second liquid adhesive layers. Thereafter, the laminate was completely cured at 300 mJ / cm 2 using a UV oven to prepare a finished product of 0.8 mm. Thereafter, the thickness and interface of each layer of the finished product were confirmed through tomography under a microscope (MX61-L, manufacturer: Olympus). This is shown in FIG. 3.

<Example 1>

After the entire process was performed at a line speed of 6 m / min on a carrier film, the first and second liquid adhesive layers having a thickness of 0.05 mm were formed by using a mixed resin based on an acrylic polymer having a viscosity of 3500 cPs, and then LED lamps were used. The first and second liquid pressure-sensitive adhesive layers were semi-cured under conditions of irradiating for 3 seconds with a light amount of 1 mJ / cm 2 to 2 mJ / cm 2 in the thickness direction to form first and second adhesive skin layers, respectively. Thereafter, a liquid substrate layer having a thickness of 0.7 mm of the acrylic polymer component was laminated with a lami coating so as to be placed between the first and second adhesive skin layers. Thereafter, the laminate was completely cured at 300 mJ / cm 2 using a UV oven to prepare a finished product of 0.8 mm. Thereafter, the thickness and interface of each layer of the finished product were confirmed through tomography under a microscope (MX61-L, manufacturer: Olympus). This is shown in FIG. 4.

<Example 2>

While the entire process was performed at a line speed of 10 m / min on a carrier film, the first and second liquid adhesive layers having a thickness of 0.05 mm were formed using a mixed resin based on an acrylic polymer having a viscosity of 5200 cPs, respectively, and then the LED lamp was used. The first and second liquid pressure-sensitive adhesive layers were semi-cured under conditions of irradiating for 2 seconds with a light amount of 2 mJ / cm 2 to 3 mJ / cm 2 in the thickness direction to form first and second adhesive skin layers, respectively. Thereafter, a laminate was formed by laminating a liquid substrate layer having an acrylic polymer component thickness of 0.3 mm between the first and second adhesive skin layers. Thereafter, the laminate was completely cured at 500 mJ / cm 2 using a UV oven to prepare a finished product of 0.4 mm. Thereafter, the thickness and interface of each layer of the finished product were confirmed through tomography under a microscope (MX61-L, manufacturer: Olympus). This is shown in FIG. 5.

3, 4 and 5 of the microscope (MX61-L, manufacturer: Olympus) through the tomography results, in the case of the comparative example, there is a mixed section of the base layer and the liquid adhesive layer and the interface is non-uniform, Examples 1 and 2 In the case of, it was confirmed that it has a relatively uniform interface. That is, it can be seen through the present invention that it is possible to accurately control the thickness of the liquid laminate and minimize the thickness variation. This means that an efficient one-path system can be built.

1: first carrier film guide roll
2: Second carrier film guide roll
3, 4: Liquid adhesive layer coating equipment
5, 6: UV lamp or LED lamp
7: first contact roll
8: Second contact roll
9: UV oven
101: first carrier film
102: second carrier film
201: first liquid adhesive layer
202: second liquid adhesive layer
301: first adhesive skin layer
302: second adhesive skin layer
400: liquid substrate layer

Claims (11)

Forming a first liquid adhesive layer on the surface of the first carrier film;
Forming a second liquid adhesive layer on the surface of the second carrier film;
Lowering the fluidity of the opposite side of the surface of the first liquid adhesive layer opposite to the first carrier film, thereby forming a portion of the first liquid adhesive layer in a thickness direction as a first adhesive skin layer;
Lowering the fluidity of the surface opposite to the surface opposite to the second carrier film of the second liquid pressure-sensitive adhesive layer to form a part of the second liquid pressure-sensitive adhesive layer in a thickness direction as a second pressure-sensitive adhesive skin layer;
The first carrier film, the first liquid adhesive layer, the first adhesive skin layer, the liquid substrate layer, the second adhesive skin layer, the upper agent so that the liquid substrate layer is disposed between the first adhesive skin layer and the second adhesive skin layer 2 forming a laminate in which the liquid adhesive layer and the second carrier film are sequentially provided; And
A method of manufacturing an adhesive tape comprising curing the laminate. According to claim 1,
The thickness of the first liquid adhesive layer and the second liquid adhesive layer before forming the first and second adhesive skin layers is 10 μm to 100 μm, respectively. According to claim 1,
The step of forming the first adhesive skin layer and the second adhesive skin layer is a method of manufacturing an adhesive tape comprising a photo-curing reaction by a lamp. According to claim 3,
The light amount of the lamp is 1mJ / ㎠ to 10 mJ / ㎠ adhesive tape manufacturing method. According to claim 1,
In the step of curing the laminate, the curing is a UV-curing adhesive tape manufacturing method. The method of claim 5,
The UV curing method is a pressure-sensitive adhesive tape manufacturing method that is made in the range of light amount of 100mJ / cm2 or more and 1500mJ / cm2 or less. According to claim 1,
After the step of curing the laminate, the adhesive tape manufacturing method comprising the step of cutting (cutting) the laminate. According to claim 1,
After the step of curing the laminate, the adhesive tape manufacturing method comprising the step of peeling the first carrier film and the second carrier film sequentially or simultaneously from the laminate. According to claim 1,
The method of manufacturing the adhesive tape is performed by a roll-to-roll process. A first carrier film; A first liquid adhesive layer; A first adhesive skin layer; Liquid base layer; A second adhesive skin layer; An upper second liquid adhesive layer; And a second carrier film sequentially provided. The adhesive tape manufactured by the manufacturing method according to any one of claims 1 to 9.

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