KR20100056936A - Double pressure sensitive adhesive without substrate and lamination method thereof - Google Patents

Abstract

PURPOSE: A double-sided pressure sensitive adhesive tape is provided to prevent the damage of adhesive aggregation, to enable a user to clearly release a light release type release sheet, and to reduce error rate. CONSTITUTION: A double-sided pressure sensitive adhesive tape comprises a light release type release sheet(1), a pressure-sensitive layer(2), and a heavy release type release sheet(3). A peeling force of the light release type release sheet is 2~30 g/25 mm and the peeling force of the heavy release type release sheet is 4~100 g/25 mm. The difference of the peeling forces of the light and heavy type release sheet is more than 2 g/25 mm.

Description

Double pressure sensitive adhesive without substrate and lamination method

The present invention relates to an inorganic double-sided adhesive tape and a lamination method thereof, and more particularly, to agglomeration of the pressure-sensitive adhesive generated when peeling the light release sheet to laminate the adhesive to the adherend in the production and application of the inorganic double-sided adhesive tape. It can prevent breakage, farewell tears, flakes and curry, reduce the defect rate caused by the use of inorganic double-sided adhesive tape, and cleanly peel even if the peeling force difference of the release sheet used for the double-sided adhesive tape is not large. The present invention relates to an inorganic double-sided adhesive tape and a lamination method thereof capable of peeling a sheet and broadening the choice in selecting a light peeling sheet and a heavy peeling sheet in the production of an inorganic double-sided adhesive tape.

In general, non-stick adhesive tapes can be thinner than conventional double-stick adhesive tapes in the form of pressure-sensitive adhesives used in various fields such as displays, electrical and electronics, civil engineering, and automobiles. It can reduce the manufacturing process, there is an advantage that can be applied to a large range in one production.

In the case of the conventional double-sided adhesive tape using a substrate such as a nonwoven fabric, a polyester film, an imide film, and the like, the adhesive must be coated on both sides of the substrate, so that many processes and manufacturing processes are required in the process. Except for the special case of giving the difference of peeling force of both sides according to the base material, the double-sided adhesive tape of the base material is rarely used, and if the property control of the adhesive is properly controlled, the peeling force difference of the base material can be made without using the base material. As a result, pressure sensitive adhesive development is progressing in the direction of not using a base material.

In addition, the internal cohesive force of the weakest adhesive among the physical properties of the double-sided adhesive tape of the inorganic material may also maintain the tensile strength and cohesive force which is not much behind that of the base material adhesive tape by controlling the thickness and curing degree of the inorganic material or the adhesive in the adhesive. In the case where the substrate is used in the heat resistant properties, the thermal properties of the substrate itself, that is, the coefficient of thermal expansion, the thermal decomposition rate, the heat stress, etc. affect the adhesion of the attached substrate. In the case of the viscoelastic properties of the pressure-sensitive adhesive, rather than absorbing the stress of the product due to the difference in the coefficient of thermal expansion.

In addition, another advantage of the inorganic pressure-sensitive adhesive is to increase the production efficiency by reducing the manufacturing process and defects of the product compared to the direct coating on the existing film or substrate. For example, in the case of a polarizing plate attached to a panel of a liquid crystal display, when the pressure-sensitive adhesive is directly coated on the polarizing plate, it is generally possible to ship the product only after 3-7 days, which is a required maturation period. However, if the aged adhesive is prepared in advance, the period of product shipment of the polarizing plate can be shortened by that much. And since the base material to which the pressure sensitive adhesive is usually attached is an expensive functional film, the problem of the pressure sensitive adhesive can be grasped in advance when the inorganic pressure sensitive adhesive is used, so that the defective rate caused by the direct coating of the pressure sensitive adhesive can be reduced. 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 users.

By the way, in the manufacture of an inorganic double-sided adhesive tape, two types of peeling sheets (or release films, separate sheets, and liners) are heavy on both sides, and light peeling sheets (light peeling sheets) are required. In order to stably use the inorganic double-sided adhesive tape, the pressure-sensitive adhesive does not go up when peeling the light peeling sheet to be peeled first, and should be safely attached to the heavy peeling sheet. However, this does not happen, the adhesive is sometimes accompanied by a light peeling sheet occurs, it is said that the cohesive failure of the pressure-sensitive adhesive layer, tears of farewell, nakiwakare or following and flipping. To prevent this, various solutions are suggested. In Japanese Laid-Open Patent Publication No. 7-041736, the peeling force of the heavy peeling sheet is 25 to 200 g / 50 mm, the peeling force of the light peeling sheet is 5 to 80 g / 50 mm, and the difference between the two peeling forces is 20 g / 50 mm or more. It is described that the surface static friction coefficient of the heavy peeling sheet is 0.4 or more. Basically, the larger the peeling force difference of the peeling sheet used in the manufacture of the inorganic double-sided adhesive tape is stable when peeling the light peeling sheet, but it is not a fundamental solution because it is limited in the selection of the peeling sheet. Moreover, even if 20 g / 50 mm or more does not differ, since it can peel a light peeling sheet cleanly, it cannot be said that it is a suitable condition of a peeling sheet. In addition, Japanese Patent Application Laid-Open No. 2008-115322 describes that the adhesive layer contains a terpene-based tackifier and a polyethylene resin to solve the cohesive failure of the pressure-sensitive adhesive, tears of farewell, and moth and flakes. It can be said that only the use of a limited pressure-sensitive adhesive is possible because the pressure-sensitive adhesive can be modified to meet the required properties. In addition, Japanese Laid-Open Patent Publication No. 2005-344008 discloses a lipophilic layered layer with a photopolymerizable polymer in order to make it possible to peel off without contaminating the adherend when peeling off, in order to make a pressure-sensitive adhesive sheet having a base response with an inorganic material structure. Although clay minerals are used, this means that the adhesive sheet has a thickness of at least 150 μm, and in the embodiment, a coating having a thickness of 1,000 μm is used as an example, so that the adhesive itself is sufficiently thick and internal cohesion may occur. I can say that the tears of farewell and Nakiwaka are not applicable. In addition, Korean Patent Publication No. 2008-0089730 discloses a method of peeling a polarizing plate adhered with an adhesive without damaging the liquid crystal display panel or tearing of the polarizing plate. The rotation direction of the peeling roller and the conveying direction of the peeling roller are the same. It describes that the peeling angle formed by the attached polarizing plate and the peeling polarizing plate is initially large and later small. In addition, Korean Patent Publication No. 2001-0037209 describes that it is important to minimize the peeling angle between the liquid crystal panel and the polarizing plate.

In general, the peel strength of the tape according to the peel angle is 120-140 degrees, ie, as described in 'Handbook of Pressure Sensitive Adhesive Technology' (Donatas Satas, ed., 1999, Satas & Associates, p79). When the peeling force is the lowest when the 120 ~ 140 degrees, and the peeling angle is lower, the peeling force is higher. Therefore, when the polarizing plate is peeled off from the liquid crystal panel, the peeling angle is designed to be low in terms of stability in order to prevent the lifting of the panel and the contamination of the adhesive, but not to easily peel off the polarizing plate. The peeling of the polarizing plate or the tape includes the stress of the adhesive according to the peeling angle, but the peeling of the release film does not include the stress effect of the adhesive. Accordingly, the present invention has been made in view of the above-mentioned phenomenon, and the present invention has been made to solve the cause of the defect of the inorganic double-sided adhesive tape by peeling the peeling sheet safely without the cohesive destruction of the adhesive by the peeling sheet, the tearing of the separation, or the mop. The present invention was completed by providing a peeling method of.

The present invention has been made in order to solve the above problems, an object of the present invention is an inorganic double-sided adhesive tape without the cohesive failure or separation of the adhesive generated when peeling the release sheet in the adhesive tape, tears and mop It is to provide a lamination method thereof.

In addition, another object of the present invention in the inorganic double-sided adhesive tape consisting of a light peeling sheet, a pressure-sensitive adhesive layer and a heavy peeling sheet in the peeling of the light peeling sheet, the pressure-sensitive adhesive layer occurs along the light peeling sheet or affect the pressure-sensitive adhesive layer or surface. It is to provide a lamination method without defects caused by the use of the inorganic double-sided adhesive tape by peeling the light peeling sheet cleanly without giving.

In addition, another object of the present invention is to provide a lamination method that can peel the light peeling sheet cleanly even if the peeling force difference of the release sheet used for the inorganic double-sided adhesive tape is not large.

In addition, another object of the present invention is to change the composition of the pressure-sensitive adhesive in the manufacture of the double-sided adhesive tape of the inorganic material, the peeling force of the peeling sheet is changed by minimizing this to widen the selection in the selection of the peeling sheet and adhesion by the peeling sheet It is to provide a lamination method that can reduce the defect of the tape.

These and other objects and advantages of the present invention will become more apparent from the following description of a preferred embodiment thereof.

The object is composed of a light peeling sheet, an adhesive layer and a heavy peeling sheet, the peeling force of the light peeling sheet is 2 ~ 30g / 25mm, the peeling force of the heavy peeling sheet is 4 ~ 100g / 25mm, the hard The difference between the peeling force of the release sheet and the peeling force of the heavy peeling sheet is achieved by an inorganic double-sided adhesive tape, characterized in that 2g / 25mm or more.

In addition, the peeling force of the light peeling sheet is 3 ~ 10 g / 25mm, the peeling force of the heavy peeling sheet is 6 ~ 20 g / 25mm, the difference between the peeling force of the light peeling sheet and the peeling force of the heavy peeling sheet. Is characterized in that about 2 ~ 10 g / 25㎜.

In addition, the object is an angle formed by the pressure-sensitive adhesive layer and the light peeling sheet is 90 to 180 degrees when peeling the light peeling sheet from the inorganic double-sided adhesive tape, the conveying direction of the pressure-sensitive adhesive layer and the conveying direction of the light peeling sheet are opposite directions It is achieved by the lamination method of an inorganic material double-sided adhesive tape characterized by adhering an adhesive layer to a to-be-adhered body, peeling the said light peeling sheet so that it may become.

Here, the inorganic double-sided adhesive tape is characterized in that consisting of a light peeling sheet, an adhesive layer and a heavy peeling sheet.

In addition, the peeling force of the light peeling sheet is 2 ~ 30g / 25mm, the peeling force of the heavy peeling sheet is 4 ~ 100g / 25mm, the difference between the peeling force of the light peeling sheet and the peeling force of the heavy peeling sheet. Is characterized in that more than 2g / 25㎜.

In addition, the peeling force of the light peeling sheet is 3 ~ 10g / 25mm, the peeling force of the heavy peeling sheet is 6 ~ 20g / 25mm, the difference between the peeling force of the light peeling sheet and the peeling force of the heavy peeling sheet. Is characterized in that about 2 ~ 10g / 25㎜.

In addition, the conveying speed of the inorganic double-sided adhesive tape for attaching the pressure-sensitive adhesive layer to the adherend is the same as the peeling speed of the light peeling sheet, the light peeling sheet to equalize the conveying speed and the peeling speed It characterized by adjusting the rotational speed of the peeling roller.

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.

According to the present invention, in the manufacture and application of an inorganic double-sided adhesive tape, it is possible to prevent the cohesive failure of the adhesive generated when peeling the light peeling sheet in order to laminate the adhesive to the adherend, tears of separation, naki and curry, etc. Has the effect of.

In addition, it is possible to reduce the defective rate due to the use of the inorganic double-sided adhesive tape, it is possible to peel off the light peeling sheet cleanly even if the peeling force difference of the release sheet used for the inorganic double-sided adhesive tape is not large, In manufacturing, it is possible to widen the selection in the selection of the light peeling sheet and heavy peeling sheet.

Hereinafter, the present invention will be described in detail with reference to embodiments and drawings of the present invention. These examples are only presented by way of example only to more specifically describe the present invention, it will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples. .

1 is a structure of a general inorganic double-sided adhesive tape (sheet), Figure 2 is a conceptual diagram of peeling the light peeling sheet 90 degrees to attach to the adherend, Figure 3 is peeling the light peeling sheet 180 degrees attached to the adherend. 4 is a conceptual diagram illustrating the peeling force according to the peeling angle and the peeling speed of the light peeling sheet and the heavy peeling sheet. In the figure, "1" represents "hard peeling sheet", "2" represents "pressure sensitive adhesive layer", "3" represents "heavy peeling sheet" and "4" represents "adhesive", respectively.

The present invention is an inorganic double-sided adhesive tape, comprising a light peeling sheet, an adhesive layer and a heavy peeling sheet, the peeling force of the light peeling sheet is 2 ~ 30g / 25㎜, the peeling force of the heavy peeling sheet is 4 ~. It is 100g / 25mm, and the peeling force difference of the said peeling sheet and the peeling force of the said heavy peeling sheet is characterized by being 2g / 25mm or more.

More preferably, the peeling force of the light peeling sheet is 3-10 g / 25mm, the peeling force of the heavy peeling sheet is 6-20g / 25mm, the peeling force of the light peeling sheet and the peeling force of the heavy peeling sheet. The difference is characterized in that about 2 ~ 10g / 25㎜.

In addition, the present invention is a lamination method of an inorganic double-sided adhesive tape, when peeling the light peeling sheet from the inorganic double-sided adhesive tape, the angle between the pressure-sensitive adhesive layer and the light peeling sheet is 90 to 180 degrees, and also the adhesive layer It is characterized in that the pressure-sensitive adhesive layer is attached to the adherend while peeling the light peeling sheet so that the conveying direction of the light peeling sheet and the conveying direction of the light peeling sheet becomes the opposite direction, that is, the two conveying directions are close to 180 degrees.

In general, the peeling force of the tape according to the peeling angle is measured at the lowest when the peeling angle is 120 to 140 degrees, and the peeling force is increased when the peeling angle is larger ('Handbook of Pressure Sensitive Adhesive Technology', Donatas Satas, ed., 1999, Satas & Associates, p79). When the peeling angle is 90 degrees, the peeling force is measured by the interface adhesive force. However, as the peeling angle increases, the deformation of the adhesive occurs a lot (deformation), and the stress caused by this offsets the interfacial adhesive force, and the peeling force is lowered. This strength varies depending on the viscoelasticity such as the internal cohesion force or the glass transition temperature of the adhesive. The peeling force is increased while passing through a certain critical point (120 to 140 degrees), since the deformation of the backing film, which is a tape substrate attached to the back side of the adhesive, occurs, and the stress of the backing film is included in the peeling force. It is known that this affects the peel force because the stress of the film varies depending on the thickness and hardness of the backing film.

In the present invention, only the film which is a release sheet, not a general adhesive tape, is peeled off, thus showing a phenomenon different from that described above (see FIG. 4). That is, as the peeling angle is increased from 90 degrees to 180 degrees, the peeling force of the peeling sheet continuously decreases. Contrary to the case of the adhesive tape, when the peeling angle is low, the deformation of the adhesive due to the adhesive force with the peeling sheet is large, and the peeling force of the peeling sheet is high, and as the peeling angle is increased, the deformation of the adhesive is reduced, so that the peeling of the peeling sheet is reduced. Force will be lowered. By the way, it turns out that the influence of the peeling force by the film stress of a peeling sheet hardly exists. The low peeling force of the release sheet in such a phenomenon means that the peeling can be performed without affecting the adhesive by minimizing the adhesive force with the adhesive when peeling the same release sheet. It also means that the peeling force can be lowered in the same peeling sheet and the adhesive even if only the peeling angle is changed. Therefore, by changing the peeling angle, the peeling force is lowered, and the peeling is stably peeled off from the adhesive, thereby preventing the cohesive failure of the adhesive generated from the double-sided adhesive tape, separation of tears, naki and curry, and the like.

In the present invention, the inorganic double-sided adhesive tape is composed of a structure of a light peeling sheet, an adhesive layer, a heavy peeling sheet. The light peeling sheet and the heavy peeling sheet has a difference in peeling force with respect to a certain standard tape (TESA 7475 tape), and the peeling force of the light peeling sheet is 2 to 30 g / 25 mm, and the peeling force of the heavy peeling sheet is It is 4-100g / 25mm, It is characterized by the difference of both peeling force being 2g / 25mm or more. Preferably, the peeling force of the light peeling sheet is 3 ~ 10g / 25㎜ and the heavy peeling sheet is the peeling force of 6 ~ 20g / 25㎜, the difference in peeling force is the difference is about 2 ~ 10g / 25㎜ desirable. When the peeling force of the light peeling sheet is too low, it is peeled off even at a small force, so that the pressure-sensitive adhesive layer cannot be protected, and when the peeling force of the heavy peeling sheet is too high, the heavy peeling sheet is peeled off after laminating the adhesive on the adherend. This is because there is a problem that a large force or noise occurs.

The release sheet according to the present invention is not particularly limited, but polyethylene, polypropylene, ethylene-vinylacetate, ethylene-vinylalcohol, polyethylene terephthalate Suitable products made of a synthetic resin film such as polyethylene terephthalate, rubber sheet, paper, cloth, nonwoven fabric, net, foam sheet, metal foil, or such adherend can be used. . 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. The peelability of a peeling sheet can be controlled by adjusting the kind of surface treatment agent used for a peeling process, its coating amount, etc.

In the lamination method according to the present invention, it is preferable that the conveying speed of the inorganic double-sided adhesive tape for attaching the pressure-sensitive adhesive layer to the adherend and the peeling speed of the light peeling sheet are the same, so that the peeling sheet can be more stably peeled. It is preferable to make the conveyance direction of an adhesive layer and the conveyance direction of a hard peeling sheet into the opposite direction. Since the diameter of the roll decreases as the adhesive tape progresses in the inorganic double-sided adhesive tape composed of rolls, the rotation speed of the adhesive tape roller should be gradually increased to transfer at the same speed, and the light peeling sheet is peeled off to transfer at the same speed. The rotational speed of the sheet roller is preferably reduced. Therefore, it is preferable to adjust the rotational speed of the peeling roller of the hard peeling sheet in order to make the feed rate of the inorganic double-sided adhesive tape and the peeling speed of the light peeling sheet the same.

In addition, the adhesive used as the adhesive layer which concerns on this invention is not specifically limited, For example, a rubber adhesive, an acrylic adhesive, a urethane type adhesive, a silicone type adhesive etc. can be used. In the adhesive, various additives such as a tackifier, a curing agent, a plasticizer, a photopolymerizable compound, a photoinitiator, a foaming agent, a polymerization inhibitor, an antioxidant, a filler, and the like may be appropriately added. 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 peeling 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 peeling sheet for printing And printing by intaglio printing, flat printing, flexographic printing, offset printing, screen printing, or the like, and transferring to an adherend. The thickness of an 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 is selected according to a use, and there is no special limitation in thickness.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative 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. Acrylic Copolymer Preparation

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% concentration in ethyl acetate as a reaction initiator, and reacted for 8 hours to prepare an acrylic copolymer.

2. 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, mixed uniformly, and then a heavy release sheet which is a biaxially stretched polyethylene terephthalate film. After coating and drying on the silicone release coating surface of (trade name RPC-101, Toray Saehan Co., Ltd.), a uniform pressure-sensitive adhesive layer of 25㎛ was prepared. Thereafter, the adhesive layer was laminated with a polyethylene terephthalate film, a light peeling sheet (trade name RPS-101, Toray Saehan), and stored at room temperature for 7 days for sufficient aging process.

When peeling the light peeling sheet in the inorganic double-sided adhesive tape prepared as described above, each evaluation was carried out while peeling the peeling angle in various ways.

[Example 2]

It was prepared in the same manner using a heavy peeling sheet (trade name RPK-101, Toray Saehan Co., Ltd.) lighter than the heavy peeling sheet used in Example 1.

Comparative Example 1

Instead of the heavy peeling sheet used in Example 1, an inorganic material double-sided adhesive tape was prepared from two sheets of the same light peeling sheet.

[Experimental Example]

Peeling force and cohesive failure of the adhesive (separation of tears, naki and curry) were measured for the inorganic double-sided adhesive tapes prepared in Examples 1 and 2 and Comparative Example 1, and the results are shown in Table 1 below. Indicated.

1. Peeling force

Tensile tester for the light-peel release film in the inorganic double-sided adhesive tape prepared in Examples 1 and 2 and Comparative Example 1 at various angles of 90 ~ 180 degrees and peeling speed of 0.3 m / min, 10 m / min as shown in Table 1 Measured using.

2. Cohesive failure of adhesives (parting of tears, naki and curry)

After cutting the inorganic double-sided adhesive tape prepared in Examples 1 and 2 and Comparative Example 1 to 200 mm × 200 mm, the adhesive layer was visually evaluated while peeling off the light peeling sheet.

◎: No adhesive is attached to the light peeling sheet, and it remains cleanly in the heavy peeling sheet.

○: There is a part where the adhesive is stretched like a thread on the light peeling sheet as a cutting part, but most of it remains cleanly in the peeling sheet.

(Triangle | delta): An adhesive remains on the surface of a hard peeling sheet 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] Peeling force of the peeling sheet (Standard: TESA 7475 tape)

As shown in Table 1, as described in Examples 1 to 2 according to the present invention, the larger the peeling angle, the smaller the peeling force of the light peeling sheet, and the peeling is performed without phenomenon such as cohesive failure of the pressure-sensitive adhesive. On the other hand, when the speed is increased, the peel force is increased together, and the cohesive failure phenomenon of the pressure-sensitive adhesive is increased. The small difference in peeling force between the heavy peeling sheet and the light peeling sheet results in cohesive failure of the adhesive when the peeling angle is small, but it is possible to prevent such a phenomenon by increasing the peeling angle. It becomes easy. Therefore, by adjusting the peeling angle, even if the peeling speed is increased or the peeling force difference is small, it is possible to solve the cohesive failure of the pressure-sensitive adhesive, tear separation, naki and curry.

Further, according to the present invention, as the peeling angle is increased, the peeling force of the light peeling sheet is lowered, thereby minimizing the influence given to the pressure-sensitive adhesive layer, and thus peeling the light peeling sheet without cohesive failure of the pressure-sensitive adhesive, tearing of tears, and moths. This is because the peeling force of the light peeling sheet and the heavy peeling sheet is changed according to the peeling angle.

In addition, when the lamination method according to the present invention is used, the difference in the peeling force of both the peeling sheets in the conventional inorganic double-sided adhesive tape should be more than 20g / 25㎜ to prevent the cohesive fracture of the pressure-sensitive adhesive, tears of farewell, mochi and curry Since at least 2g / 25mm or more can be used, there is an effect that the choice of the release sheet can be increased.

In accordance with the present invention, when the adhesive double-sided adhesive tape prevents cohesive failure, tear separation, naki and curry, the range of application varies 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 structure of an inorganic double-sided adhesive tape,

2 is a conceptual diagram of peeling the light peeling sheet to 90 degrees to adhere to the adherend,

3 is a conceptual diagram of peeling the light peeling sheet 180 to attach to the adherend,

Figure 4 is a graph showing the peeling force according to the peeling angle and peeling rate of the light peeling sheet and heavy peeling sheet.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

1: Light peeling sheet 2: Pressure-sensitive adhesive layer

3: heavy peeling sheet 4: adhesive

Claims (8)

Inorganic double sided adhesive tape, It consists of a light peeling sheet, an adhesive layer and a heavy peeling sheet, the peeling force of the light peeling sheet is 2 ~ 30g / 25mm, the peeling force of the heavy peeling sheet is 4 ~ 100g / 25mm, the peeling of the light peeling sheet The strength between the peeling force and the heavy peeling sheet is 2g / 25mm or more, inorganic material double-sided adhesive tape. The method of claim 1, The peeling force of the light peeling sheet is 3 ~ 10g / 25mm, the peeling force of the heavy peeling sheet is 6 ~ 20g / 25mm, the difference between the peeling force of the light peeling sheet and the peeling force of the heavy peeling sheet is 2 ~ 10g An inorganic material double-sided adhesive tape, which is about 25 mm. In the lamination method of an inorganic double-sided adhesive tape, When peeling the light peeling sheet from the inorganic double-sided adhesive tape, the angle formed by the pressure-sensitive adhesive layer and the light peeling sheet is 90 degrees to 180 degrees, and the conveying direction of the pressure-sensitive adhesive layer and the conveying direction of the light peeling sheet are opposite to each other. An adhesive layer is attached to a to-be-adhered body, peeling a light peeling sheet, The lamination method of an inorganic material double-sided adhesive tape. The method of claim 3, The inorganic double-sided adhesive tape is a lamination method of the inorganic double-sided adhesive tape, characterized in that consisting of a light peeling sheet, an adhesive layer and a heavy peeling sheet. The method of claim 4, wherein The peeling force of the light peeling sheet is 2 ~ 30g / 25mm, the peeling force of the heavy peeling sheet is 4 ~ 100g / 25mm, the difference between the peeling force of the light peeling sheet and the peeling force of the heavy peeling sheet is 2g Lamination method of an inorganic double-sided adhesive tape, characterized in that / 25mm or more. The method of claim 5, The peeling force of the light peeling sheet is 3 ~ 10g / 25mm, the peeling force of the heavy peeling sheet is 6 ~ 20g / 25mm, the difference between the peeling force of the light peeling sheet and the peeling force of the heavy peeling sheet is 2 A lamination method for an inorganic double-sided adhesive tape, which is about 10 g / 25 mm. The method according to any one of claims 3 to 6, The conveying speed of the inorganic double-sided adhesive tape for attaching the pressure-sensitive adhesive layer to the adherend is the same as the peeling speed of the light peeling sheet, and the peeling of the light peeling sheet to make the conveying speed and the peeling speed the same. Laminating method of the inorganic double-sided adhesive tape, characterized in that for adjusting the rotational speed of the roller. The method of claim 7, wherein The adherend is 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, and the like. Lamination method of adhesive tape.

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