KR20110064946A - Release sheet for a double-coated adhesive tape and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A release sheet for a double-coated adhesive tape is provided to enable the omission of a lamination process of a secondary paper release sheet using only one release sheet, and to reduce defects. CONSTITUTION: A method for manufacturing a release sheet for a double-coated adhesive tape comprises the steps of: applying a release agent liquid for forming a lightly releasable layer(3) to one side of a polyester film(2), heating and drying the resultant, and storing the dried material at room temperature; preparing a release agent liquid for forming a middle-releasable layer(1); and applying the middle-releasable agent liquid to the other side of the lightly releasable agent of the substrate and heating the resultant to prepare a double-sided release sheet.

Description

Release sheet for a double-coated adhesive tape and manufacturing method

The present invention relates to a double-sided release sheet for double-sided pressure-sensitive adhesive processing, and a method for manufacturing the same, and more particularly, to processing an inorganic double-sided adhesive tape using one double-sided release sheet instead of two release sheets used when processing an inorganic double-sided adhesive tape The present invention relates to a double-sided release sheet for double-sided adhesive processing, and a method of manufacturing the same, which can reduce cost by simplifying the process and reducing the use of raw materials.

In general, base-free double-coated adhesive tape is a type of adhesive used throughout various industries, such as display, electrical and electronic fields, civil engineering and construction fields, automotive fields, etc. Compared with the double-sided adhesive tape, the thickness can be made thin, and the manufacturing process can be reduced, and there is an advantage that it can be applied to many ranges with one production. In other words, in the case of a double-sided adhesive tape using a substrate such as a nonwoven fabric, a polyester film, or an imide film, the adhesive must be coated on both sides with a substrate therebetween, so many processes and manufacturing processes are required in the process. Double sided adhesive tapes do not have this disadvantage. Therefore, except for the special case of giving a difference in the peeling force of both sides according to the base material, the base material double-sided adhesive tape is hardly used. Moreover, if the property control of the pressure-sensitive adhesive is properly controlled, the base material is not used without the base material. Since there can be a difference in the peel force according to the situation in which the development of the pressure-sensitive adhesive in the direction of not using the substrate ultimately. The difference in the peeling force is disclosed, for example, the Republic of Korea Patent Application No. 2007-0045230 is a "double-sided tape having an adhesive layer of different adhesive strength and its manufacturing method", the first adhesive layer and the first adhesive layer It is disclosed that the second adhesive layer having less adhesive strength is formed on both sides of the base paper, whereby it is easy to attach, does not damage the adhered surface upon removal, and enables recycling during contamination.

In addition, the advantage of using the inorganic pressure-sensitive adhesive having the above characteristics is that the production process and defects of the product can be reduced as compared to the direct coating of the pressure-sensitive adhesive on the film or the substrate can increase the production efficiency. For example, in the case of a polarizing plate attached to a panel of a liquid crystal display, when a pressure-sensitive adhesive is directly coated on a polarizing plate, a product may be shipped after about 3 to 7 days, which is a required maturation period. However, if an aged adhesive such as an inorganic adhesive is prepared in advance, the period of product shipment of the polarizing plate can be shortened by that amount. In addition, since the base material to which the pressure sensitive adhesive is usually attached is an expensive functional film, when the inorganic pressure sensitive adhesive is used, the problem of the pressure sensitive adhesive can be grasped in advance, thereby reducing the defect rate caused by the direct coating of the pressure sensitive adhesive. In addition, since various adhesives can be applied to a substrate such as an expensive functional film without directly applying the adhesive, there is an advantage in terms of the user.

By the way, a double-sided tape including an inorganic double-sided adhesive tape having the above-mentioned advantages is usually a heavy release sheet (or may be referred to as "release film", "separated", "liner") in its manufacture. Two types of release sheets (heavy peeling sheets) and light release sheets (hard peeling sheets) are required, and a process in which an adhesive is coated on one of these two types of release sheets and laminated with other types of release sheets Due to the manufacturing process, there is a drawback that the manufacturing process is complicated and the consumption of the release sheet is high, but in the prior art, not only these disadvantages are recognized but also the disadvantages are not recognized. .

Accordingly, the present inventors have intensively studied the method of reducing the use of the release sheet and simplifying the process by avoiding the conventional uniform process in the above-described conventional double-sided pressure-sensitive adhesive to complete the present invention.

Therefore, an object of the present invention is to solve the above disadvantages in the double-sided adhesive, it is possible to omit the lamination process of the secondary paper release sheet by using only one release sheet can reduce the failure rate by that much And to provide a double-sided release sheet for double-sided adhesive processing that can reduce the cost by reducing the amount of raw materials used.

Another object of the present invention is to provide a method of more easily manufacturing a double-sided release sheet for double-sided pressure-sensitive adhesive processing having the characteristics as described above.

Another object of the present invention is to provide a double-sided adhesive tape that can lower the manufacturing cost by using a double-sided release sheet having the above characteristics in the manufacturing process of the double-sided adhesive tape.

The present invention may also be aimed at achieving, in addition to the above-mentioned specific objects, other objects which can be easily derived by those skilled in the art from this and the overall description of the present specification.

The above object of the present invention can be achieved by providing both sides of the release sheet to have different peeling force, so that only one release sheet provided can be used to provide a method that can be wound up without lamination process after coating the adhesive on one surface. there was.

Double-sided release sheet for double-sided adhesive processing of the present invention for achieving the above object;

In the double-sided release sheet for double-sided adhesive processing,

Peeling force of both sides of the release sheet is treated differently, wherein the difference in the peeling force of both sides is characterized in that 2 to 15g / 25mm.

According to another configuration of the present invention, one side of the release sheet is characterized in that the heavy release agent is applied and the other side is a light release agent.

According to another configuration of the present invention, the peeling force of the surface to which the light release agent is applied is 2 to 20g / 25mm, and the peeling force of the surface to which the heavy release agent is applied is 4 to 100g / 25mm. do.

According to another configuration of the present invention, the release sheet is characterized in that the substrate is a polyester film thickness of 20 to 100㎛.

Method for producing a double-sided release sheet for double-sided adhesive processing of the present invention for achieving the above another object;

Applying a release agent solution for forming a light release release layer containing, as a main component, a light release agent having a peeling force of 2 to 20 g / 25 mm on one surface of a polyester film, heating, drying, and storing at room temperature;

Preparing a releasing agent liquid for forming a heavy releasing release layer containing a heavy releasing agent having a peeling force of 4 to 100 g / 25 mm as a main component; And

The heavy release agent solution obtained in the above step is applied to the opposite side of the surface on which the light release agent of the substrate is applied, and is dried by heating to prepare a double-sided release sheet.

Double-sided pressure-sensitive adhesive tape using a double-sided release sheet for double-sided pressure-sensitive adhesive processing of the present invention for achieving the above another object;

Winding by applying an adhesive layer to the heavy release layer of the release sheet in which light release and heavy release layers were formed by applying different release agents having a difference in peel force of 2 to 15 g / 25 mm on both sides of the release sheet. It is characterized in that the adhesive layer is obtained by winding the adhesive layer coated surface as the inner surface so that the adhesive layer can reach the light peeling surface.

The double-sided release sheet for double-sided pressure sensitive adhesive processing of the present invention configured as described above treats different release agents having mutually different peeling powers on both sides, so that the peeling force of both sides shows a constant difference. The release sheet of the two should be used but the release sheet according to the present invention using only one release sheet using a double-sided adhesive including an inorganic double-sided adhesive as a release sheet coating on one side and the other side of the adhesive Since it is laminated on the side, it is possible to produce a double-sided adhesive tape with only one sheet. That is, the release sheet of the present invention can also omit the lamination process that must be passed when using two conventional release sheets by using only one release sheet to simplify the double-sided adhesive tape manufacturing process, such a release sheet Double-sided adhesive tape using is easy to use because it can be delaminated directly from the substrate without the delamination process of removing one release sheet when using two existing release sheets.

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

1 is a cross-sectional view of a double-sided release sheet for double-sided adhesive processing according to an embodiment of the present invention, Figure 2 is a side view showing the wound state of the inorganic double-sided adhesive tape and the release sheet set from the side.

According to a preferred embodiment of the present invention as described above, the release sheet of the present invention is used in the manufacture of an inorganic double-sided adhesive tape, the user by winding the adhesive on one side of the double-sided release sheet to the opposite side after coating As a double-sided release sheet that can be used immediately without a lamination process when used, as shown in FIG. 1, the release layer 1 on one side of the release sheet substrate 2 and the light release layer 3 on the opposite side thereof. Is formed.

Therefore, the double-sided adhesive tape obtained by using the release sheet of the present invention configured as described above as a release sheet for double-sided adhesive processing, as shown in Figure 2, the light-peelable release layer (3), the release sheet base material (2) and heavy foil Since the adhesive layer 4 is formed on the release sheet composed of the Lee release layer 1, it may be simply manufactured.

In general, the conventional inorganic double-sided adhesive tape is composed of a light peeling sheet, a pressure-sensitive adhesive layer, a heavy peeling sheet (not shown), so that the release sheet of the present invention has a structure as described above, compared to using two sheets. As a single release sheet, a double-sided adhesive is coated on one surface and wound and used to simplify the manufacturing process.

The light peeling release layer and the heavy peeling release layer has a difference in peeling force with respect to a certain standard tape (for example, TESA 7475 tape), and the peeling force of the light peeling release layer is 2 to 30 g / 25 mm, The peeling force of a mold release layer is 4-100 g / 25 mm, and the difference of the peeling force of both layers is 2 g / 25 mm or more. Preferably, the peeling force of the light peeling release layer is 3 to 10g / 25mm, the peeling force of the heavy peeling release layer is 10 to 20g / 25mm, and the difference in peeling force is about 10g / 25mm. good. If the peeling force of the light peeling release layer is too low, the peeling force cannot be protected even with a small force, and if the peeling force of the heavy peeling release layer is too high, the heavy peeling sheet is applied after laminating the adhesive on the adherend. When peeling, there is a problem that a large force or noise occurs.

According to a preferred embodiment of the present invention, rather than giving the above-mentioned relative difference of peeling force to different release sheets, it is achieved by applying a different release agent to each of both surfaces of one release sheet. In addition, the coating of the adhesive layer is carried out on the heavy peeling surface and is wound around the adhesive layer coating surface as the inner surface so that the adhesive layer can reach the hard peeling surface during the final winding through an intermediate process. The release sheet is not particularly limited, but may be polyethylene, polypropylene, ethylene-vinyl acetate, ethylene-vinyl alcohol, or polyethylene tere. Suitable products are made of synthetic resin films such as polyethylene terephthalate, rubber sheets, paper, fabrics, nonwovens, nets, foaming sheets, metal foils, or such adherents. have. It is preferable to apply a peeling treatment such as silicone treatment, long cyclic alkyl treatment, fluorine treatment or the like to the surface of the release sheet in order to increase the peelability from the pressure-sensitive adhesive layer. Peelability of a release sheet can be controlled by adjusting the kind of surface treatment agent used for a release process, its coating amount, etc.

In addition, the pressure-sensitive adhesive that can be used in the present invention is not particularly limited, and for example, a rubber pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, a silicone pressure-sensitive adhesive and the like can be used. Various additives, such as a tackifier, a hardening | curing agent, a plasticizer, a photopolymerizable compound, a photoinitiator, a foaming agent, a polymerization inhibitor, an antioxidant, a filler, etc. may be added suitably in an adhesive. The adhesive may use a substance that is cured by radiation or heating. For example, the method of hardening | curing by irradiating an ultraviolet-ray which is a kind of radiation, and forming an adhesive layer, and the method of drying and hardening by heating, and forming an adhesive layer can be used. The method of forming an adhesive layer is not specifically limited, For example, the method of apply | coating on a release sheet with a coater, such as a gravure coater, a comma coater, a bar coater, a knife coater, or a roll coater, an iron plate to a release sheet for printing And printing by intaglio printing, flat printing, flexographic printing, offset printing, screen printing, or the like, and transferring to an adherend.

In addition, the thickness of the said adhesive layer is not specifically limited, It is preferable to set it as about 1-1000 micrometers by the thickness after drying, A suitable thickness can be selected according to a use, and thickness is not specifically limited.

Although the optimum structure, method, etc. for implementing this invention are described above, the scope of the present invention is not limited to this. That is, although specifically shown and described specifically about a specific embodiment, the shape, material, quantity, and other detailed structure with respect to embodiment described above are not deviated from the range of the technical idea and the objective of this invention. The person in charge can make several variations.

Hereinafter, the present invention will be described in more detail with reference to Examples. This embodiment is intended to illustrate the present invention in more detail, and the scope of the present invention is not limited to these examples.

Example 1

1. Double-sided Release Sheet Manufacturing

First, as a base material, the biaxially stretched polyethylene terephthalate film (Toray Saehan Co., Ltd. make: brand name "XD500P") of an average thickness of 38 micrometers was prepared. 100 parts by weight of a silicone resin (Shin-Etsu Co., Ltd. product name: "KS847") and 2 parts by weight of a platinum catalyst (Shin-Etsu Co., Ltd. product name: "PL50T") were prepared, and these were diluted with toluene to give a solid content of 1.8% by weight. Release agent liquid for layer formation was prepared. The obtained light peeling release agent liquid was apply | coated to the said base material using a Mayer bar, it heated at 140 degreeC for 20 second, dried, and stored at normal temperature.

Then, 90 parts by weight of a silicone resin (Shin-Etsu Co., Ltd. product name: "KS3703") and 10 parts by weight of an additive (Shin-Etsu Co., Ltd. product name: "X-92-158") as a heavy releasing agent were prepared, and these were diluted with toluene and solid content. A mold release agent liquid for forming a heavy release mold layer having a concentration of 1.8% was prepared. The obtained heavy peeling release agent liquid was apply | coated to the opposite surface to which the light peeling release agent of the said base material was apply | coated using a Mayer bar, and it heated and dried at 140 degreeC for 20 second, and produced the double-sided release sheet.

2. Adhesive Manufacturing

60% by weight of n-butyl acrylate (BA), 29% by weight of 2-ethylhexyl acrylate (2-EHA), 10% by weight of acrylic acid in a 1L reactor equipped with a refrigeration system for easy reflux of nitrogen gas And 1.0% by weight of 2-hydroxybutyl acrylate (2-HBA), and then 100 parts by weight of an ethyl acetate (EAc) solvent was added to 100 parts by weight of the monomer mixture. Then, after purging nitrogen gas for 1 hour to remove oxygen, it was maintained at 55 ℃. To the mixture was added 0.02 parts by weight of azobisisobutyronitrile (AIBN) diluted to 50% in ethyl acetate as a reaction initiator, and reacted for 8 hours to prepare an acrylic copolymer.

3. Compounding and Coating Process

To 100 parts by weight of the acrylic copolymer prepared above, 3.0 parts by weight of a prepolymer (HDI) of hexamethylene diisocyanate was added as a crosslinking agent, diluted to an appropriate concentration, and mixed uniformly. Then, the double-sided release was a biaxially stretched polyethylene terephthalate film. After coating and drying on the heavy peeling surface of the sheet to prepare a uniform adhesive layer of 25㎛. Thereafter, the adhesive layer was wound up to contact the light peeling surface, which is the opposite surface of the release sheet, and then stored at room temperature for 7 days for sufficient aging process. The degree of defect of the adhesive layer was evaluated while unwinding the adhesive and the double-sided release sheet set thus wound.

Comparative Example 1

A double-sided adhesive tape was prepared in the same manner as in Example 1, except that the light-peel release agent used in Example 1 was used as a heavy-peel release agent, and the light-peel release agent (Shin-Etsu Co., Ltd. product name: "KS3755") was changed.

Example 2

A double-sided adhesive tape was prepared in the same manner as in Example 1 except that the heavy release agent used in Example 1 and the light release agent used in Comparative Example 1 were used.

Experimental Example

The release sheets and the inorganic double-sided pressure-sensitive adhesive tapes prepared in Examples 1 to 3 were measured by peeling force and cohesive failure of the pressure-sensitive adhesive in the following manner, and the results are shown in Tables 1 and 2 below:

One. Peel force

In the release sheets and inorganic double-sided adhesive tape prepared in Examples 1 to 3, the light peeling release layer was measured using a tensile tester at a peel rate of 0.3 m / min and 10 m / min as shown in Table 2.

2. Cohesive failure of adhesive

2 to 3 layers of the wound set prepared in Examples 1 to 3 were carefully cut to 200 mm X 200 mm in size so as not to be peeled off, and the adhesive layer was visually evaluated as follows. Table 1 shows.

(Double-circle): There is no adhesion of adhesive to a light peeling sheet, and it remains cleanly in a heavy peeling sheet.

(Circle): There are some areas where the adhesive is stretched like a thread on the light peeling sheet as a cutting part, but most of them remain cleanly in the heavy peeling sheet.

(Triangle | delta): An adhesive remain | survives on the hard peeling sheet surface around a cutting part.

X: The adhesive remained in the hard peeling sheet other than the periphery of a cutting part.

TABLE 1

TABLE 2

Peel force of release layer (Standard: TESA 7475 tape, 0.3m / min)

As shown in Table 1, the double-sided release sheet of Examples 1 and 2 prepared in accordance with the present invention, because the light peeling layer and the heavy peeling layer exhibits a peel force difference of about 10g / 25mm, the phenomenon such as cohesive failure of the pressure-sensitive adhesive Without peeling cleanly, on the other hand, as the speed is increased, the peeling force is increased and it can be seen that the cohesive failure of the adhesive is increased. However, in the case of Comparative Example 1 in which the difference in the peeling force between the light peeling layer and the heavy peeling layer is out of the range of the present invention, it can be seen that a phenomenon such as cohesive fracture appears and is not preferable. As a result, the peeling force difference between the light peeling layer and the heavy peeling layer is less affected by the peeling rate at an appropriate level, it can be seen that the relative peeling force difference between the peeling layer and the peeling rate is related.

In addition, the double-sided release sheet of the present invention configured as described above is useful for the production of the double-sided adhesive tape of the inorganic material, agglomeration of the pressure-sensitive adhesive in the inorganic double-sided adhesive tape with a difference in the appropriate peeling force between the light peeling surface and the heavy peeling surface of the double-sided release sheet Preventing breakage can lead to a wide range of applications, depending on the type of adherend used. The adherend may be a flexible base material such as a functional film in a display, an exterior film of a home appliance or a building exterior material, or a hard base material such as plastic such as glass, SUS, acrylic or polycarbonate, for example, a polarizing plate of a liquid crystal display, There are anti-reflection (AR) film, color correction film, electromagnetic wave (EMI) blocking film, and other optical functional film of plasma display, and it can be used for SUS and polyvinyl chloride film (PVC) of home exterior materials. The range of use varies.

1 is a cross-sectional view of a double-sided release sheet for double-sided pressure-sensitive adhesive processing according to an embodiment of the present invention,

Figure 2 is a side view showing the wound state of the inorganic double-sided adhesive tape and the release sheet set from the side.

DESCRIPTION OF THE REFERENCE NUMERALS

1 --- heavy release layer

2 --- Release Sheet

3 --- light release layer

4 --- adhesive layer

Claims (6)

In the double-sided release sheet for double-sided adhesive processing, The peeling force of both sides of the release sheet is treated differently, wherein the difference in peeling force of both sides is a double-sided release sheet for double-sided adhesive processing, characterized in that 2 to 15g / 25mm. The double-sided release sheet for double-sided adhesive processing according to claim 1, wherein one side of the release sheet is coated with a heavy release agent and the other side is a light release agent. The double-sided pressure sensitive adhesive according to claim 2, wherein the peeling force of the surface to which the light release agent is applied is 2 to 20g / 25mm, and the peeling force of the surface to which the heavy release agent is applied is 4 to 100g / 25mm. Double-sided release sheet for processing. According to claim 1, wherein the release sheet is a double-sided release sheet for double-sided pressure-sensitive adhesive processing, characterized in that the substrate is a polyester film thickness of 20 to 100㎛. Applying a release agent solution for forming a light release release layer containing, as a main component, a light release agent having a peeling force of 2 to 20 g / 25 mm on one surface of a polyester film, heating, drying, and storing at room temperature; Preparing a releasing agent liquid for forming a heavy releasing release layer containing a heavy releasing agent having a peeling force of 4 to 100 g / 25 mm as a main component; And The double-peel release agent for double-sided pressure-sensitive adhesive processing, characterized in that the step of applying the heavy release agent solution obtained in the step on the opposite side of the surface on which the light-peel release agent of the base material is applied, and dried by heating to produce a double-sided release sheet. Manufacturing method. It is obtained by applying the adhesive layer to the heavy release layer of the double-sided release sheet according to any one of claims 1 to 4 to the adhesive layer coating surface as the inner surface so that the adhesive layer can reach the light peeling surface during winding. Double-sided adhesive tape using the double-sided release sheet for double-sided adhesive processing characterized by the above-mentioned.

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