KR102328421B1 - Acrylic adhesive tape capable of adhering irrespective of the type of adherend and manufacturing thereof - Google Patents

Abstract

Disclosed are an acrylic adhesive tape capable of adhering regardless of adherend type, which can be applied to various adhesive surfaces because the acrylic adhesive tape has a stable adhesive force and has little variation in adhesive force depending on types of adherend; and a method for manufacturing the same. Provided is a method for manufacturing an easily peelable double-sided adhesive tape which comprises a step of preparing a thermoplastic polyurethane film capable of being horizontally elongated; and a step of coating an adhesive on an upper surface and a lower surface of the polyurethane film, wherein the adhesive is manufactured by mixing acrylate, silane, an initiator, and a solvent.

Description

Acrylic adhesive tape capable of adhering irrespective of the type of adherend and manufacturing thereof

The present invention relates to an acrylic adhesive tape that can be adhered irrespective of the type of adherend and a method for manufacturing the same, and more particularly, it has a stable adhesive strength and has little variation in adhesive strength depending on the type of adherend, so that it can be applied to various adhesive surfaces. It relates to an acrylic adhesive tape that can be adhered regardless of the type of adherend and a method for manufacturing the same.

In general, electronic products equipped with display means or photographing means, such as mobile phones or vehicle navigation devices or small video recording devices (digital cameras, black boxes, etc.) The work of fixing the same optical material to the fixing part is carried out.

Various methods such as a screw fixing method, an adhesive fixing method, and a double-sided adhesive tape fixing method are used for this fixing method. Here, the double-sided adhesive tape fixing method is widely used because it is simple and inexpensive.

In particular, for member fixing of electronic and optical parts, in some applications, a tape for transferring the pressure-sensitive adhesive layer is used to cope with reduction in thickness. Therefore, although many double-sided adhesive tapes having a thin film shape have been developed, since these double-sided adhesive tapes require strict environmental resistance tests, the pressure-sensitive adhesive layer has not been so thin so far.

In addition, the double-sided adhesive tape is a major industrial material that is widely used as a variety of industrial materials in the electronic and electrical industry, display manufacturing process and automobile industry and in various industrial fields, and is particularly important for display purposes.

Specifically, the double-sided adhesive tape is used for bonding various devices in a display, and therefore its durability and optical properties are required. In the case of an inorganic double-sided adhesive tape that can be adhered to both sides, it has a structure in which an adhesive exists between two release films, and the release film is composed of a light peeling film and a heavy peeling film. The peeling force of the light peeling film is higher than the peeling force of the jungbak peeling film, and thus the light peeling film is first peeled from the adhesive layer, then the adhesive layer is attached to the substrate, and then the middle peeling film is removed. At this time, when the balance of the peeling force of the light peeling film and the light peeling film is not balanced, the adhesive layer is lifted or transferred to the film when the light peeling film is peeled off. In addition, if the coating condition of the release film is not uniform, a zippy sound is generated due to uneven peeling with the adhesive when the film is peeled off. Such problems may cause deterioration of work in the process or product defects.

However, the prior art as described above has the following problems.

If the device on which the part is fixed by the conventional double-sided adhesive tape fixing method breaks down or a defect occurs during the assembly process of the device, when the double-sided adhesive tape attached to the part is removed, the adhesive applied to the tape remains attached to the part,

The adhesive residue does not come off easily, so it is difficult to remove it, and there is a problem in that unnecessary time and manpower are required to remove it. Therefore, various methods are being used to prevent damage caused by these residues.

In US Patent No. 10508224, in manufacturing an adhesive film containing an acrylate compound, the adhesiveness is controlled by curing using electromagnetic waves having a specific energy. However, the use of such specific energy requires a lot of initial equipment cost, which is uneconomical and has disadvantages in that it is difficult to respond to various materials.

In US Patent No. 07101615, the intermediate support is manufactured to have a specific shape, so that the intermediate support can be deformed when the adhesive tape is removed, so that the adhesive component can be easily removed. However, such deformation of the intermediate support may result in poor durability of the intermediate support, and since no special processing or properties are added to the adhesive surface, there is a disadvantage that the residual adhesive component may appear.

Therefore, it is necessary to develop an acrylic adhesive tape capable of exhibiting high adhesive ability without the adhesive component remaining on the object, and capable of sticking regardless of the type of adherend that can be applied to various materials and a method for manufacturing the same.

The present invention has been devised to solve the above problems, and an object of the present invention is to smoothly solve various problems caused by adhesive residues because adhesive residues do not remain when the double-sided adhesive tape is removed while having stable adhesive strength. To provide an acrylic adhesive tape that can be adhered regardless of the type of adherend and a method for manufacturing the same.

Another object of the present invention is to provide an acrylic adhesive tape that can be adhered regardless of the type of the adherend that can be easily adjusted according to the required use by appropriately deforming the surface of the adhesive tape when manufacturing the adhesive tape, and a method for manufacturing the same. .

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to solve the above problems, the present invention comprises the steps of preparing a horizontally stretchable thermoplastic polyurethane film; and coating an adhesive on the upper and lower surfaces of the polyurethane film, wherein the adhesive is prepared by mixing an acrylate, a silane, an initiator and a solvent. Provided is a method for manufacturing an acrylic adhesive tape that can be adhered regardless of the type of adherend.

In one embodiment, the pressure-sensitive adhesive is prepared by mixing 3 to 10 parts by weight of silane, 0.05 to 0.1 parts by weight of an initiator, and a solvent based on 100 parts by weight of an acrylate to prepare a mixed solution; It may be prepared by a method comprising the step of preparing a pressure-sensitive adhesive by adding and mixing 1 to 5 parts by weight of polymer beads to the mixed solution.

In one embodiment, the acrylate is based on 100 parts by weight of the high molecular weight acrylic copolymer having a weight average molecular weight of 2,000,000 to 2,500,000, (B) 20 to 100 of the medium molecular weight acrylic copolymer having a weight average molecular weight of 1,500,000 to 2,000,000. It may be a mixture by weight.

In one embodiment, before adding the polymer-based beads in the step of preparing the pressure-sensitive adhesive, smooth surface treatment of the outer surface of the polymer-based beads; applying a lubricant to the outer surface of the smooth surface-treated polymer-based beads; and coating the mixed solution on the outer surface of the polymer-based beads to which the lubricant is applied to form a protective layer.

In one embodiment, the polymer-based beads may be made of polydecyl methacrylate.

In one embodiment, the polymer-based beads may have a particle size of 1 to 100 μm.

In one embodiment, the step of preparing the thermoplastic polyurethane film, mixing a polyol and an isocyanate, and then preparing a thermoplastic polyurethane film through uniaxial stretching; and pressing both sides of the film with a roller to form a groove in the same direction as the stretching direction.

In an embodiment, the polyol is a polyether-based or polyester-based polyol, and the isocyanate may be an aromatic isocyanate, an aliphatic isocyanate, or a combination thereof.

In one embodiment, the aromatic isocyanate is diphenylmethane diisocyanate (4,4'-Diphenylmethnae diisocyanate, MDI), polymeric diphenylmethane diisocyanate (polymeric 4,4'-Diphenylmethnae diisocyanate, PMDI), toluene diisocyanate ( toluene diisocyanate (TDI), 1-4 phenylene diisocyanate (1,4-phenylene diisocyanate, PPDI) or 1,5-Naphthalene diisocyanate (NDI), wherein the aliphatic isocyanate is 1,6- Hexamethylene diisocyanate (1,6-Hexamethylene diisocyanate, HDI), isophoron diisocyanate (IPDI) or dicyclohexylmethane-4,4'-diisocyanate (H12MDI) can be

In an embodiment, the grooves may have a depth of 0.1 to 100 μm, and may be formed at intervals of 0.1 to 200 μm.

In an embodiment, the groove may include a front groove formed on one surface of the film and a rear groove formed on the other surface of the film.

In an embodiment, the rear grooves may be formed parallel to the front grooves, and may be formed to be equally spaced from the front grooves.

In an embodiment, the rear groove may be formed parallel to the front groove, and may be formed to have a different distance from the front groove.

In one embodiment, the double-sided adhesive tape, a) has a predetermined length and width, the thermoplastic polyurethane film layer separated into two or more pieces along the entire length and width by an external force; and b) an adhesive coated on both sides of the thermoplastic polyurethane film layer.

In one embodiment, the thermoplastic polyurethane film layer has a density of 20 ~ 400kg / ㎥, may have a thickness of 175㎛ ~ 100mm.

In one embodiment, the thermoplastic polyurethane film layer may include a foam-containing substrate.

^{In one embodiment, the thermoplastic polyurethane film layer comprises an active energy curing layer having a storage modulus (G'a25) of less than 1.0x10 6} Pa measured at a temperature of 25° C. and a frequency of 1.0 Hz, and the active energy curing The layer comprises a polyurethane having a polymerizable unsaturated double bond and an acrylate compound having 2 to 4 polymerizable unsaturated double bonds, wherein the acrylate compound is 5 to 30 parts by weight relative to 100 parts by weight of the polyurethane having an unsaturated double bond. It may be parts by weight.

In one embodiment, the active energy curing layer may have a thickness of 10㎛ or more.

In one embodiment, the active energy curing layer is tolylene diisocyanate, chlorophenylene diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, xylylene diisocyanate, isophorone diisocyanate , may include at least one polyisocyanate selected from the group consisting of diphenylmethane diisocyanate and hydrogenated diphenylmethane diisocyanate.

The present invention also provides a film manufacturing unit capable of uniaxial stretching; a groove forming roller for forming a groove by pressing the upper and lower portions of the film discharged from the film manufacturing unit; a pressure-sensitive adhesive applying means for applying an adhesive to the upper and lower surfaces of the grooved film; and a laminating means for attaching a release film to both sides of the adhesive-coated film.

According to an embodiment of the present invention, while having a stable adhesive force regardless of the adherend, no adhesive residue is left when the double-sided adhesive tape is removed, so that various problems caused by the adhesive residue are smoothly resolved.

In addition, the present invention is to form a groove on the surface of the film, the contact surface can be changed according to stretching, and accordingly, a method for manufacturing an acrylic adhesive tape that can be adhered regardless of the type of the adherend that can easily remove the adhered film can provide

In addition, the present invention includes a polymer-based bead in the adhesive, and when an external force is applied to remove the adhesive film, the polymer-based bead protrudes to the outside to facilitate the release of the adhesive. It is possible to provide a method of manufacturing an acrylic adhesive tape that can be adhered regardless of the type of the adhesive.

The effect according to the present invention is not limited by the contents exemplified above, and more various effects are included in the present invention.

1 schematically shows a method of manufacturing an acrylic adhesive tape that can be adhered regardless of the type of the adherend according to an embodiment of the present invention.
2 schematically shows a method for preparing an adhesive solution among methods for manufacturing an acrylic adhesive tape that can be adhered regardless of the type of the adherend according to an embodiment of the present invention.
3 schematically shows a method for manufacturing a polymer-based bead according to an embodiment of the present invention.
4 schematically shows a manufacturing method including a manufacturing method of a thermoplastic polyurethane film among the manufacturing methods of an acrylic adhesive tape that can be adhered regardless of the type of adherend according to an embodiment of the present invention.
5 shows the structure of a conventional adhesive tape.
6 shows the structure of an acrylic adhesive tape according to an embodiment of the present invention.
7 shows the structure of an acrylic adhesive tape having a narrow groove interval according to an embodiment of the present invention.
8 shows the structure of an acrylic adhesive tape having a wide groove interval according to an embodiment of the present invention.
9 shows the structure of an acrylic adhesive tape having a trapezoidal protrusion according to an embodiment of the present invention.
10 shows the structure of an acrylic adhesive tape having a triangular-shaped protrusion according to an embodiment of the present invention.
11 is an enlarged view of a part of an acrylic adhesive tape including a polymer-based bead according to an embodiment of the present invention.
12 is an enlarged view of a portion of an acrylic adhesive tape including a polymer-based bead having a small size according to an embodiment of the present invention.
13 is an enlarged view of a portion of an acrylic adhesive tape including a large polymer-based bead according to an embodiment of the present invention.
14 shows the deformation of the groove when the acrylic adhesive tape is stretched according to an embodiment of the present invention.
15 is a view showing the change of the polymer-based bead when stretching the acrylic adhesive tape according to an embodiment of the present invention.
16 is a diagram illustrating a change in a polymer-based bead having a small size when stretching an acrylic adhesive tape according to an embodiment of the present invention.
17 shows a change in a polymer-based bead having a large size when the acrylic adhesive tape according to an embodiment of the present invention is stretched.
18 shows a thermoplastic polyurethane film layer separated into two or more pieces by an external force according to an embodiment of the present invention.
19 shows the structure of an acrylic adhesive tape including an active energy curing layer according to an embodiment of the present invention.
20 schematically shows the structure of an apparatus for manufacturing an acrylic adhesive tape according to an embodiment of the present invention.
21 shows the structure of a roller for forming a groove according to an embodiment of the present invention.

Hereinafter, various embodiments will be described in more detail with reference to the accompanying drawings. The embodiments described herein may be variously modified. Certain embodiments may be depicted in the drawings and described in detail in the detailed description. However, the specific embodiments disclosed in the accompanying drawings are only for easy understanding of various embodiments. Therefore, the technical spirit is not limited by the specific embodiments disclosed in the accompanying drawings, and it should be understood to include all equivalents or substitutes included in the spirit and scope of the invention.

Terms including an ordinal number, such as first, second, etc., may be used to describe various elements, but these elements are not limited by the above-described terms. The above terminology is used only for the purpose of distinguishing one component from another component.

In this specification, terms such as "comprises" or "have" are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof. When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is mentioned that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

Meanwhile, as used herein, a “module” or “unit” for a component performs at least one function or operation. And “module” or “unit” may perform a function or operation by hardware, software, or a combination of hardware and software. In addition, a plurality of “modules” or a plurality of “units” other than a “module” or “unit” that must be performed in specific hardware or are executed in at least one processor may be integrated into at least one module. The singular expression includes the plural expression unless the context clearly dictates otherwise.

In addition, in describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be abbreviated or omitted.

1 is a brief view of the easily peelable adhesive tape of the present invention.

The present invention comprises the steps of preparing a horizontally stretchable thermoplastic polyurethane film; and coating an adhesive on the upper and lower surfaces of the polyurethane film, wherein the adhesive is prepared by mixing an acrylate, a silane, an initiator and a solvent. It relates to a method for manufacturing an acrylic adhesive tape that can be adhered regardless of the type of adherend.

The step of preparing the polyurethane film may include mixing a polyol and an isocyanate, and then preparing a thermoplastic polyurethane film through uniaxial stretching; and pressing both sides of the film with a roller to form a groove in the same direction as the stretching direction (see FIG. 4 ).

Polyurethane has high malleability and ductility, and is chemically stable, so it can be used in the adhesive tape of the present invention. In addition, in the case of the present invention, a urethane-based pressure-sensitive adhesive is used for the pressure-sensitive adhesive, and since the adhesive force with the film used for the core portion should be higher than the adhesion between the urethane-based pressure-sensitive adhesive and the adherend, a high affinity ratio using the thermoplastic polyurethane It is preferable to have

In this case, the polyol may be a polyether-based or polyester-based polyol, and the isocyanate may be an aromatic isocyanate, an aliphatic isocyanate, or a combination thereof.

The polyether-based polyol is a polyhydric alcohol such as sucrose, sorbitol, glycol, glycerol, or the like, or a compound having a divalent or higher active hydrogen, such as polyamine, as a starting material, and may be selected from copolymer polyols such as ethylene oxide and propylene oxide.

In addition, the polyester-based polyol is synthesized by using a polybasic acid and a polyalcohol having a hydroxyl group such as glycol and glycerol as a solvent, and the polyhydric alcohol is ethylene glycol, 1-4 butanediol, and 1,6-hexanediol. , polyethylene glycol, diethylene glycol, and the like, and the polybasic acid may be selected from aromatic base acids such as terephthalic acid, adipic acid, maleic acid, and succinic acid, aliphatic dibasic acids, and the like.

Aromatic isocyanate is diphenylmethane diisocyanate (4,4'-Diphenylmethnae diisocyanate, MDI), polymeric diphenylmethane diisocyanate (polymeric 4,4'-Diphenylmethnae diisocyanate, PMDI), toluene diisocyanate (TDI), 1 A compound containing -4 phenylene diisocyanate (1,4-phenylene diisocyanate, PPDI) and 1,5-naphthalene diisocyanate (1,5-Naphthalene diisocyanate, NDI) is an isocyanate having an aromatic ring.

Aliphatic isocyanate is 1,6-hexamethylene diisocyanate (1,6-Hexamethylene diisocyanate, HDI), isophorone diisocyanate (Isoporon diisocyanate, IPDI), dicyclohexylmethane-4,4'-diisocyanate (Dicyclohexylmethane-4, 4'-diisocyanate, H12MDI) may be used.

In addition, a catalyst may be further mixed in order to prepare the polyurethane. The catalyst is included in order to promote the crosslinking reaction between the polyol and the isocyanate, and may be used without limitation as long as it is a catalyst generally used in the manufacture of polyurethane. However, in order to increase the reactivity and improve physical properties, preferably, an amine-based catalyst and a trimerization catalyst may be mixed and used, and more preferably N,N-dimethylcyclohexylamine (N,N-dimethylcyclohexylamine), N,N, N',N'-pentamethyldiethylenetriamine (N,N,N',N'-pentamethyldiethylenetriamine), triethylenediamine, di-N-butyltindilaurylate, potassium acetate, lithium acetate, acetic acid Magnesium, an organotin compound, an organotitanium compound, or a combination thereof may be used.

In addition, in order to improve the physical properties of the foaming agent for foaming the polyurethane layer and the resulting polyurethane composite foaming agent, additives such as a foam stabilizer, a surfactant, a flame retardant, and a lubricant may be additionally included and used.

In particular, in the case of the foaming agent, since the polyurethane is foamed so that the adhesive tape has properties such as heat insulation, insulation, and interlayer absorbency, it may be included depending on the purpose of use of the adhesive tape.

In the present invention, it is preferable to use a chemical foaming agent for smooth foaming. The chemical foaming agent is mixed with the polyurethane-silica airgel analog composite resin precursor to generate a gas when the polyol and the isocyanate react or immediately after the reaction. Normal pentane, cyclopentane, Preference is given to using isopentane, hydrogenchlorofluorocarbons (H-CFCs), hydrogenfluorocarbons (H-FCs) or water.

After mixing the polyol and the isocyanate as described above, it can be polymerized and produced into a film at the same time.

To this end, the step of preparing the thermoplastic polyurethane film may include mixing a polyol and an isocyanate, and then preparing a thermoplastic polyurethane film through uniaxial stretching; and pressing both sides of the film with a roller to form a groove in the same direction as the stretching direction.

In the case of the thermoplastic polyurethane, it is preferable to be prepared by stretching in the uniaxial direction. That is, the thermoplastic polyurethane may be stretched in the horizontal direction to be manufactured into a film, and through this, the thermoplastic polyurethane may have elasticity in the horizontal direction. In this case, the stretching may be manufactured using a stretching means for manufacturing a general film, and by passing a roller after the stretching, the surface may be processed smoothly and at the same time to have a uniform thickness.

In this case, the film is preferably prepared in an inert gas atmosphere. Since the polyol and isocyanate have high reactivity, they may be oxidized by contact with oxygen when left in the atmosphere. In order to prevent this, the production of the film is preferably performed in an inert gas atmosphere.

this?? The inert gas used is preferably nitrogen, helium, neon, argon or xenon, and more preferably nitrogen.

In the present invention, the term “atmosphere” means replacing the inside of the reactor or reaction space with a certain gas, and for example, the inert gas atmosphere means replacing the entire air inside the reactor with an inert gas.

The thermoplastic polyurethane film prepared as described above may be compressed with a roller on both sides to form a groove (see FIG. 6 ). The groove is preferably formed in the same direction as the stretching direction, that is, in a horizontal direction.

The groove is a portion formed to control the adhesive force of the thermoplastic polyurethane film, and the adhesive force of the thermoplastic polyurethane film can be adjusted according to the shape and density of the groove, and an external force is applied to remove the thermoplastic polyurethane film. When applied, especially when stretching in the horizontal direction, the groove can be easily removed while deforming.

In the present invention, the term groove refers to depressions formed at regular intervals. In the present invention, valleys may be formed on the surface of the film at regular intervals so that the valleys and the protrusions are alternately positioned.

Looking at the grooves in detail, the grooves are formed by alternately repeating valleys and protrusions. In this case, the portion in contact with the adherend corresponds to the protrusion, and by adjusting the shape of the protrusion, the contact area with the adherend and the adhesive strength may be adjusted at the same time.

As an example, when the protrusion has the shape of a semicircle with a small diameter, the depth of the valley is also lowered, so that when pressing to attach the adhesive tape, it can be attached to the adherend in a wide range, and as a result, the adhesive force is reduced. It can be strong (see Fig. 7).

Conversely, in the case of having a semicircle with a large diameter, even if pressure is applied as the bone portion deepens, a portion of the bone may remain unattached, and thus it is possible to have a low adhesive force (see FIG. 8 ).

In addition, in order to further control the adhesive force, the protrusion may be manufactured in a shape constituting a part of an ellipse, and may be manufactured in a trapezoidal, rectangular, or triangular shape. That is, by controlling the shape and spacing of the protrusions, it is possible to adjust the adhesive strength even if the same adhesive is used (see FIGS. 9 and 10 ).

In addition, the groove may facilitate separation of the adhesive when the adhesive tape is removed. When the adhesive tape is removed, an external force is applied to the adhesive tape. In particular, there are many cases where the side surface of the adhesive tape is stretched to remove it. In this case, the groove may be deformed, and thus the adhesive surface may be deformed and thus easily removed. In particular, when stretching in the same direction as the direction of the grooves, the gap between the grooves is narrowed, and the area of the protrusion is reduced. As a result, the adhesive surface is reduced, so that it can be naturally separated from the adherend (refer to FIG. 14 ) ).

In addition, the grooves may have a depth of 0.1 to 100 μm, and may be formed at intervals of 0.1 to 200 μm. When the groove has a depth of less than 0.1 μm, the adhesive force control by the groove may not appear, and if the groove has a depth exceeding 100 μm, the thickness of the film may be reduced and durability may be reduced, and the interval of less than 0.1 μm may be reduced. In the case of having, the durability of the adhesive tape may be deteriorated, and when the adhesive tape is formed at an interval exceeding 200 μm, the adhesive surface may be widened and thus control of the adhesive force may not appear.

In addition, the groove may be formed on both sides of the film. That is, the groove may include a front groove formed on one surface of the film and a rear groove formed on the other surface of the film (see FIG. 6 ).

At this time, it is preferable that the grooves are manufactured so that each groove is parallel. In the case of the adhesive tape of the present invention, it is preferable to remove it by stretching in the direction in which the grooves are formed, so the grooves are formed to have uniform intervals on the surface of the film, and each groove is arranged to be parallel to each other, so that it is easy to remove through stretching can be made to be removed. When the grooves are not parallel, a point at which the grooves are replaced may occur, which means that there is a possibility that an adhesive may remain at the intersection. Accordingly, the grooves may be manufactured to be parallel.

Also, the grooves may be simultaneously formed on both surfaces of the film as described above. That is, the groove may include a front groove formed on one surface of the film and a rear groove formed on the other surface of the film.

In this case, the front groove and the rear groove may be arranged at equal intervals or may have different intervals. When the front groove and the rear groove are arranged at equal intervals, it can have the same adhesive force on both sides of the tape. can

Looking at this in detail, the previous ?? When the grooves and the rear grooves are arranged at equal intervals, that is, when the intervals between the front grooves and the rear grooves are the same, when the tape is removed by stretching, the front and rear surfaces of the tape may come off at the same time. Using this, it can be manufactured to remove the tape at once.

In addition, in this case, the valley formed in the rear groove is manufactured to be located in the center of the protrusion of the front groove, and the film can be manufactured to have a certain thickness. can be produced.

However, when the front groove spacing and the rear groove spacing are different from each other, the adhesive strength of the front and back surfaces of the tape may be different. can be Therefore, when the tape is applied to an electronic product, the adhesive tape can be removed while it is attached to the disassembled part, and it can be easily removed by removing the shaving part attached to the part and then stretching it a little more. In this case, it is preferable to appropriately adjust the distance between the front groove and the rear groove so that the valley of the front groove and the valley of the rear groove are not formed at the same position. That is, the distance between the front grooves and the rear groove is preferably formed to have an integer multiple. When the valley of the front groove and the valley of the rear groove are formed at the same position, the film thickness at the point where the valleys meet may be thinned and the film may be broken during stretching, which may leave a residue when the electrodeposition film is removed. means there is Therefore, it is preferable to manufacture so that the distance between the front groove and the rear groove has an integer multiple so that the troughs of the groove do not meet at a constant position.

After the thermoplastic polyurethane film is manufactured as described above, an adhesive may be coated on the upper and lower surfaces of the polyurethane film.

The pressure-sensitive adhesive comprises: preparing a mixed solution by mixing 3 to 10 parts by weight of silane, 0.05 to 0.1 parts by weight of an initiator, and a solvent based on 100 parts by weight of an acrylate; It may be prepared by a method comprising the step of preparing a pressure-sensitive adhesive by adding and mixing 1 to 5 parts by weight of polymer beads to the mixed solution.

That is, in the present invention, by providing a silane-modified acrylic pressure-sensitive adhesive composition copolymerized with silane, it is possible to realize excellent adhesion to various materials while using an acrylic pressure-sensitive adhesive having a lower price than a silicone pressure-sensitive adhesive.

The acrylate is based on 100 parts by weight of the high molecular weight acrylic copolymer having a weight average molecular weight of 2,000,000 to 2,500,000, (B) 20 to 100 parts by weight of the medium molecular weight acrylic copolymer having a weight average molecular weight of 1,500,000 to 2,000,000. It may be a mixture. .

The weight average molecular weight of the high molecular weight acrylic copolymer is 2 million to 2.5 million, more preferably in the range of 2.2 million to 2.5 million. By using the acrylic copolymer having a high molecular weight as described above, good adhesion between adherends can be ensured, and foaming or undesired peeling can be prevented. In addition, the weight average molecular weight of the medium molecular weight acrylic copolymer is 1.5 million to 2 million, preferably 1.5 million to 1.8 million. Suitable molecular weight control of the acrylic copolymer can be achieved by appropriately controlling conditions such as polymerization reaction time, polymerization initiator, polymerization reaction temperature, and polymerization reaction solvent.

The preparation of the high molecular weight acrylic copolymer is carried out at a temperature of 55 to 58° C., and 0.1 to 0.18 parts by weight of azobisisobutyronitrile (AIBN) as a polymerization initiator relative to 100 parts by weight of the acrylic monomer is mixed. The molecular weight acrylic copolymer may be prepared by mixing 0.19 to 0.25 parts by weight of azobisisobutyronitrile (AIBN) as a polymerization initiator relative to 100 parts by weight of the acrylic monomer at a temperature of 64 to 68° C. The high molecular weight and medium molecular weight acrylic copolymer is a copolymer of an alkyl acrylate as a main component and a functional group-containing monomer having reactivity with the acrylic acid ester and the polyfunctional compound. Examples of the alkyl acrylate having an alkyl group having 4 to 12 carbon atoms that form the high and medium molecular weight acrylic copolymer include methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, iso-butyl acrylate , 2-ethylhexyl acrylate, n-octyl acrylate, iso-octyl acrylate, lauryl acrylate, stearyl acrylate, cyclohexyl acrylate, and the like, but is not limited thereto. The alkyl acrylate may be used alone or in combination of two or more.

On the other hand, the silane is added to silane-modify the acrylic adhesive, and 3-(Trimethoxysilyl)propyl methacrylate) is used, and if the content is out of the above range, it is modified. Since this is not done properly, there is a fear that the effect of improving the adhesion to the silicone material may be insufficient.

The initiator, which is added to react the respective acrylates, uses benzoyl peroxide, and when the content is out of the above range, the adhesive strength is insufficient or the unreacted acrylate components are the adhesive material There is a risk of remaining in the

The solvent is added for viscosity control, and toluene or methyl ethyl ketone is used, but the content can be adjusted according to the content of the silane. Preferably, the total solids of the adhesive is 30 It is added so that it becomes ~40% by weight.

In addition, since there is a risk of haze of the acrylic pressure-sensitive adhesive composition due to the addition of silane, it is preferable to adjust the overall polarity by increasing the use ratio of toluene according to the increase of silane.

On the other hand, looking at the manufacturing method of the pressure-sensitive adhesive using each material is as follows.

First, 30% by weight of the total content of the acrylate mixture, 25% by weight of the total content of the solvent, and 30% by weight of the total content of the initiator are mixed in a reactor, and after nitrogen purge, the initiation reaction is carried out at 80° C. .

And after confirming the increase of the viscosity through the initial initiation reaction, the remaining 70 wt% of the acrylate, 75 wt% of the solvent and 70 wt% of the initiator are dropped over 5 hours, and when the viscosity increases rapidly, a solvent is added to adjust the viscosity. do. 30 minutes after the end of dropping, when the conversion rate reaches 80~85%, dilute the corresponding amount of silane to 10% in a solvent and drop for 1 hour, and then the reaction is maintained until the conversion rate reaches 100% or more. It is prepared by continuously dropping the solvent to adjust the final solid content of 30-40% by weight and cooling to room temperature to terminate the reaction.

Here, when the manufacturing conditions are out of the above range, there is a risk that the acrylate may not be sufficiently polymerized or a rapid reaction may proceed. In addition, when silane is added at a conversion rate of 80 to 85%, gelation of the acrylic pressure-sensitive adhesive composition can be prevented. There is a possibility that the polymerization of the silane does not occur in the main chain.

After preparing the mixed solution as described above, 1 to 5 parts by weight of polymer beads may be added to the mixed solution and mixed to prepare an adhesive.

The polymer-based bead refers to a sphere made of a polymer material and is soft and elastic, and when the double-sided adhesive tape is stretched horizontally and becomes thin, it protrudes out of the adhesive layer and is exposed, the contact area between the adherend and the adhesive layer It serves to separate the adhesive layer and the adherend without the adhesive residue while significantly reducing the adhesive force by reducing the adhesive strength (see FIG. 15).

The polymer-based beads are preferably mixed in an amount of 1 to 5 parts by weight based on 100 parts by weight of the acrylic pressure-sensitive adhesive. It does not protrude properly to the outer surface of the, and when the polybur-based beads are included in excess of 5 parts by weight, the amount is increased and thus the adhesive force may be lowered because it may protrude to the surface of the pressure-sensitive adhesive.

As the polymer-based bead, a material such as polymethyl methacrylate, nylon, polyurethane, polydecyl methacrylate, silica, etc. can be used. In this case, the curing agent isocyanate and urethane reaction occur, so the bonding strength with the adhesive layer is excellent.

In addition, the polybur-based bead is preferably manufactured to have a thickness less than the thickness of the adhesive layer. In the present invention, since the pressure-sensitive adhesive may have a thickness of 1 to 200 μm, the polybur-based beads preferably have a size of 1 to 100 μm. In particular, in the case of the polymer-based beads, it is preferable to be buried in the adhesive layer and exposed only during stretching, so when the thickness of the adhesive is L and the diameter of the polymer-based bead is R, it is more preferable to have the following ratio ( 11-13).

[Equation 1]

R=(L/(100+p))X100+K

(This?? K is 1~50㎛, and p is the elongation (%) of the film)

The K denotes a removal rate of the pressure-sensitive adhesive by the polymer bead, and as the size of K increases, the amount of elongation is reduced when the adhesive tape is removed, but the adhesive strength of the adhesive material may be weakened. And it is preferable to adjust the stretching amount.

In addition, in the case of P, it represents the elongation of the film. When the elongation of the film is low, a bead having a thickness similar to the thickness of the adhesive layer should be used, and when the elongation of the film is high, it has a small diameter compared to the thickness of the pressure-sensitive adhesive It is preferable to select and use an appropriate bead according to each elongation using polymer beads.

For example, when the film has an elongation of 100%, the pressure-sensitive adhesive may be stretched by about two times by stretching, and in this case, the thickness of the pressure-sensitive adhesive may be reduced to 1/2. Therefore, when using a polybur bead that satisfies the above formula, that is, a polymer bead having a diameter corresponding to half the thickness of the adhesive layer, a part of the polymer bead protrudes to the surface of the adhesive by the stretching to separate the adhesive. can

That is, when using a polymer-based bead having a size less than the above range, it is difficult to expect an adhesive removal effect because the polymer-based bead does not protrude in the case of stretching (see FIG. 16), and a polymer-based bead having a size exceeding the above range is not expected. In the case of using beads, the adhesive strength may be reduced because the polymer-based beads may protrude to the outside of the adhesive even before stretching (see FIG. 17 ).

Before adding the polymer-based beads, smooth surface treatment of the outer surface of the polymer-based beads; applying a lubricant to the outer surface of the smooth surface-treated polymer-based beads; and coating the mixed solution on the outer surface of the polymer-based beads to which the lubricant is applied to form a protective layer (see FIG. 3 ).

Since the polymer-based beads have to protrude to the outer surface of the fixer when the adhesive is re-core, it is preferable to perform surface processing so as not to adhere to the adhesive. To this end, the surface of the polymer-based bead may be processed to be smooth, and then a lubricant may be applied. For the lubricant used at this time, it is preferable to use a lubricant having low affinity with the pressure-sensitive adhesive, and it is more preferable to use a silicone lubricant, molybdenum lubricant, Teflon lubricant or mineral oil-based lubricant, and most preferably Teflon with high lubricity and low reactivity. A lubricant may be used.

The mixed solution may be applied to the surface of the polymer-based bead coated with the lubricant. Through this, when the polymer-based beads are mixed with the mixed solution, the generation of air bubbles can be minimized and it is possible to prevent agglomeration inside the mixed solution.

In addition, the mixed solution may further include one or more additives selected from the group consisting of UV stabilizers, antioxidants, fillers and plasticizers. These additives may be appropriately adjusted within a range that does not impair the physical properties of the pressure-sensitive adhesive composition.

The mixed solution prepared as described above may have a solid content of 20 to 30% by weight and a viscosity of 2500 to 3500 cps. When the solid content is less than 20% by weight, it is difficult to separate the pressure-sensitive adhesive, and residues may be generated. In addition, when the viscosity of the mixed solution is less than 2500 cps, the prepared adhesive may flow without being fixed, and if it has a viscosity exceeding 3500 cps, the adhesive strength may be reduced.

The double-sided adhesive tape may include: a) a thermoplastic polyurethane film layer having a predetermined length and width and separated into two or more pieces along the entire length and width by an external force; and b) an adhesive coated on both sides of the thermoplastic polyurethane film layer (see FIG. 18 ).

The thermoplastic polyurethane film layer may be separated into two or more pieces by an external force.

In this case, the external force means a force applied to the film from the outside, and means a force applied in an arbitrary direction of the film, such as torsion, lever force, or peeling force. The thermoplastic polyurethane film layer may be separated into two or more pieces by this external force, and the distance between the pieces may be changed through the separation as described above, which further increases the deformation of the pressure-sensitive adhesive material to facilitate the pressure-sensitive adhesive can be made separable.

In addition, in this case, the thermoplastic polyurethane film layer may include a foam-containing substrate so that the thermoplastic polyurethane film layer can be easily separated by the external force as described above.

As the foam-containing substrate, a foam-containing support material (intermediate foam support) may be used so that it can be appropriately cut under the action of the external force, in particular homogeneous and copolymers of ethylene, especially low-density and ultra-low-density polyethylene (LDPE, LLDPE, VLDPE) , ethylene vinyl acetate copolymers and mixtures of the above-mentioned polymers can be used. In addition, the foam-containing substrate may include polyvinyl acetate, polypropylene, aromatic and aliphatic diisocyanate-based polyurethane, polystyrene, polystyrene, PVC, or an acrylate copolymer. In addition, the foam-containing substrate may be used in a crosslinked or non-crosslinked form.

In this case, the thermoplastic polyurethane film layer may have a density of 20 to 400 kg/m 3 , preferably 25 to 150 kg/m 3 , and a thickness of 175 μm to 100 mm, preferably 350 μm to 3 mm. In the chestnut, the thermoplastic polyurethane film layer may be easily separated by the external force, but if it is less than the thickness or less than the density, it may be separated even when no external force is applied, exceeding the thickness or exceeding the density In this case, separation may not occur even when an external force is applied.

The foam may have a closed cell, open cell or mixed cell structure. In addition, it is preferable to use a foam having a surface structure as the foam, but it is also okay to use a foam without such a surface structure. It is also possible to use a combination of two or more foams having different structures as the foam. In this case, it may be manufactured to have different thermal insulation properties between each point, and through this, it is also possible to fabricate a structure that performs insulation at some points and emits heat at other points.

^{The thermoplastic polyurethane film layer includes an active energy cured layer having a storage modulus (G'a25) of less than 1.0x10 6} Pa measured at a temperature of 25° C. and a frequency of 1.0 Hz, wherein the active energy cured layer is a polymerizable unsaturated double layer. a polyurethane having a bond and an acrylate compound having 2 to 4 polymerizable unsaturated double bonds, wherein the acrylate compound may be 5 to 30 parts by weight relative to 100 parts by weight of the polyurethane having an unsaturated double bond (Fig. 19).

Since the adhesive tape of the present invention has excellent adhesive strength when attached to an adherend, the adhesive tape can effectively prevent the adherend and the like from detaching.

However, this high adhesive strength has the effect of preventing the detachment of the adherend, while also having the possibility of leaving a residue of the adhesive. Therefore, in the case of the present invention, it can be easily peeled off after irradiating the active energy with the active energy cured layer as described above.

The adhesive tape having an uncured active energy cured layer before irradiating the active energy may be configured such that the adhesive layer strongly adheres to the adherend when attached to the adherend. In this case, the adhesive tape itself may be relatively flexible. Such properties may break the adhesive force between the adherend and the adhesive layer, or make it difficult to perform peeling when the adhesive tape is to be peeled from the adherend.

The hardness of the peelable adhesive tape having a cured layer described later by the active energy irradiation increases as the hardness of the cured layer increases. Therefore, when peeling the adhesive tape from the adherend, it can be easily peeled off by the cured layer. In particular, in the present invention, since the film layer is deformed through stretching after the curing is completed, the deformation of the cured layer is further increased in this process, so that the adhesive tape can be more easily removed.

The active energy curing layer of the present invention is installed on one or both sides of the film layer, and can be cured by supply of active energy. Through this, when an external force is applied to the film layer, particularly when the film layer is stretched in the horizontal direction, the film layer may be broken or deformed by the cured layer, which further accelerates the deformation of the adhesive layer by the groove. so that it can be easily separated. In addition, since the active energy cured layer of the present invention can act as a buffer layer of the adhesive layer or as a layer to increase the adhesiveness of the adhesive layer when it is not cured, it has high adhesive strength before the supply of active energy as described above. The adhesive tape can be easily separated by feeding and stretching in the horizontal direction.

In this case, when the active energy cured layer is used only on one surface of the film, separation of the adhesive surface may be selectively performed. Through this, when the component is attached to the adherend surface, the active energy hardened layer can be formed only in the direction of the adherend surface. Accordingly, when the active energy is supplied and stretched, the adherend surface can be separated first. Therefore, it is possible to minimize the phenomenon of the adhesive tape remaining on the adherend surface when the part is removed, and in the case of the adhesive tape attached to the part, the tape can be stretched a little more and can be easily removed by deformation of the groove.

In this case, the active energy used may be ultraviolet rays. The ultraviolet rays have a short wavelength and thus have a relatively large transferable active energy, and thus the active energy cured layer can be cured in a short time.

It is preferable to use an LED as a light source used for irradiating the ultraviolet rays. The LED preferably uses a semiconductor LED chip, and the semiconductor LED chip preferably uses a GaN-based semiconductor LED chip as a semiconductor chip having a light emission half maximum width of 30 nm having a central wavelength at 405 nm. In this case, the semiconductor LED chip may have an emission peak at 380 nm or more and 430 nm or less, and preferably has an external quantum efficiency of 50% or more. If the emission peak is out of the above range, it cannot have a central wavelength at 405 nm, so that the curing of the active energy cured layer may be incomplete. In addition, in the case of the light emitting LED, various structures (electrode structure, reflective structure, flip chip structure inverted upside down, etc.) for extracting more light generated from the light emitting layer to the outside may be additionally included.

In addition, it is preferable that the LED uses a semiconductor LED chip emitting light in the ultraviolet and purple wavelength region having an emission peak of 350 nm or more and 430 nm or less, unlike LEDs used in conventional lighting devices. In the case of a conventional ultraviolet lamp, visible light is emitted and then it is converted into ultraviolet light using a phosphor. However, in this case, energy loss may occur in the process of converting the phosphor to the phosphor, and a part of visible light may be leaked to obstruct the view of the operator. Therefore, in the case of the LED used in the present invention, it is preferable to use a GaN-based semiconductor chip so that the semiconductor chip can directly emit ultraviolet light.

The active energy cured layer may have a storage modulus (G'a25) measured at a temperature of 25° C. and a frequency of 1.0 Hz less than ^{1.0×10 6 Pa.} Accordingly, the adhesive tape may have excellent peel adhesion when attached to an adherend. In addition, the active energy cured layer preferably has a storage modulus (G'a25) of ^{less than 1.0x10 6} Pa, and more preferably a storage modulus (G'a25) of 5.0x10 ⁵ Pa or less. In this case, the adhesive tape may have excellent peel adhesion when attached to an adherend. The lower limit of the elastic modulus (G'a25) is preferably 1.0x104 Pa, but this is not necessarily the case.

The storage modulus (G'a25) and storage modulus (G'a25) at 25°C can be obtained using a viscoelasticity tester (Rheometrics, Inc. product name: ARES-2KSTD) as follows.

The viscoelasticity tester comprises the steps of placing a test piece between parallel disks in a measuring unit of the tester; and measuring a storage modulus and a loss modulus at a temperature of 25° C. and a frequency of 1 Hz. The test piece used for the measurement was used by cutting the active energy cured layer into a circle having a thickness of 1 mm and a diameter of 8 mm.

The active energy curing layer may include a polyurethane having a polymerizable unsaturated double bond and an acrylate compound having 2 to 4 polymerizable unsaturated double bonds.

The active energy curing layer preferably has a functional group (eg, a hydroxyl group) having a reactivity with an adhesive layer (eg, an isocyanate group) to be described later in order to have better adhesion and to prevent separation over time.

Examples of the functional group that the active energy curing layer may have may include a thermally reactive functional group such as a hydroxyl group. In this case, the adhesive layer is preferably an adhesive layer having a thermally reactive functional group such as an isocyanate group.

The active energy curing layer may preferably contain, for example, an epoxy resin, acrylic acrylate or a polyurethane having a thermally reactive functional group and an active energy curable functional group such as acryloyl. In particular, polyurethane having a thermally reactive functional group and a layer containing an active energy curable functional group such as an acryloyl group are more preferable.

The polyurethane having a thermally reactive functional group such as an acryloyl group and an active energy curable functional group is preferably a reaction product between a polyurethane having an isocyanate group and an acrylic monomer having a functional group reactive with an isocyanate group (eg, a hydroxyl group) It may be polyurethane.

The polyurethane having an isocyanate group is preferably a reaction product of a polyol and a polyisocyanate. In this case, the polyol may include a polycarbonate polyol, a polyester polyol, and a polyether polyol.

The polycarbonate polyol may include a low molecular weight polyol having reactivity with carbonate ester or phosgene.

Carbonic acid esters may include methyl carbonate, dimethyl carbonate, ethyl carbonate, diethyl carbonate, cyclo carbonate or diphenyl carbonate.

Examples of the low molecular weight polyol reactive with the carbonate ester or phosgene include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, 1,2-propanediol, 1,3-propanediol, dipropylene glycol, tripropylene Glycol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 1,5-pentanediol, 1,5-hexanediol, 1,6-hexanediol, 2,5 -hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol, 1,12-dodecanediol, 2- Methyl-1,3-propanediol, neopentyl glycol, 2-butyl-2-ethyl-1,3-propanediol, 3-methyl-1,5-pentanediol, 2-ethyl-1,3-hexanediol, 2-methyl-1,8-octanediol, 1,4-cyclohexanedimethanol, hydroquinone, resorcin, bisphenol A, bisphenol F or 4,4'-biphenol

The active energy curing layer is tolylene diisocyanate, chlorophenylene diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, xylylene diisocyanate, isophorone diisocyanate, diphenylmethane diiso and at least one polyisocyanate selected from the group consisting of cyanate and hydrogenated diphenylmethane diisocyanate.

The present invention also provides a film manufacturing unit capable of uniaxial stretching; a groove forming roller for forming a groove by pressing the upper and lower portions of the film discharged from the film manufacturing unit; a pressure-sensitive adhesive applying means for applying an adhesive to the upper and lower surfaces of the grooved film; and a laminating means for attaching a release film to both sides of the adhesive-coated film.

The film manufacturing unit 510 of the present invention may be used without limitation as long as it is a manufacturing device capable of manufacturing the film through horizontal stretching. However, in the case of the horizontally stretchable thermoplastic polyurethane used in the present invention, it is possible to form a stretching axis in one or more directions in the horizontal direction, and preferably, since the stretching axis may have a longitudinal direction, such a horizontally stretchable thermoplastic It is preferable to use an apparatus capable of producing a polyurethane film.

The film prepared as described above may be drawn out through a roller. The roller used at this time has a flat surface, unlike a roller for forming a groove, which will be described later, and thus the surface of the manufactured film can be formed flat.

After the production of the film is completed as described above, the groove may be formed by inserting the film into the groove forming roller.

Since the groove-forming roller 520 has protrusions for forming grooves on its surface, a certain groove can be formed on the surface of the film according to the shape of the protrusions. In the present invention, since it is preferable to form the grooves in the longitudinal direction of the film, the projections for forming the grooves may be projections formed on the outer peripheral surface of the roller in the circumferential direction. When the rollers having the groove-forming protrusions are positioned in the vertical direction and then the film is passed between the rollers, grooves may be uniformly formed in the film (see FIG. 21 ).

In addition, a preheater may be installed on the front surface of the roller to further facilitate the formation of the groove as described above, and the roller may also be heated to a constant temperature. In the case of the film of the present invention, since a horizontally stretchable thermoplastic polyurethane is used, it may be softened on the surface of the film when heated to an appropriate temperature. Therefore, it is preferable to easily form a groove on the surface of the film by heating the roller to a predetermined temperature while using a preheater for heating the film.

After the groove is formed as described above, an adhesive may be applied to one or both surfaces of the film. The pressure-sensitive adhesive may be applied through the pressure-sensitive adhesive applying means 530, and the pressure-sensitive adhesive may be applied to the surface of the film using a spray or roller, but the film of the present invention has a plurality of grooves formed on the surface, so spray spray It is preferable to apply the adhesive using a method.

After the pressure-sensitive adhesive is applied by the pressure-sensitive adhesive application means, the pressure-sensitive adhesive may be cured to have adhesiveness. For the convenience of application in the application process as described above, the pressure-sensitive adhesive may be manufactured to have a low viscosity. However, at such a low viscosity, the adhesive may not only remain on the adherend, but also aggregate or flow off the surface of the film. Therefore, it is preferable to increase the viscosity by curing the pressure-sensitive adhesive after the application is completed as described above.

After the application of the adhesive is completed as described above, the release film may be attached to one or both sides of the film through the laminating means 540 . The release film is attached to the adhesive surface to prevent curing of the adhesive surface before use of the adhesive tape of the present invention and at the same time to prevent foreign substances from adhering to the adhesive surface, polyethylene terphthalate, polyvinyl chloride, polyethylene, It may be a film made of a polymer material such as polypropylene or polystyrene, or a foil made of iron, copper, aluminum, zinc, tin or lead.

The laminating means may be used without limitation as long as it is a means capable of uniformly attaching the release film to the adhesive surface.

Hereinafter, preferred embodiments of the present invention will be described so that those of ordinary skill in the art can easily implement them with reference to the accompanying drawings. In addition, in the description of the present invention, if it is determined that a detailed description of a related known function or a known configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, certain features presented in the drawings are enlarged, reduced, or simplified for ease of description, and the drawings and components thereof are not necessarily drawn to scale. However, those skilled in the art will readily appreciate these details.

Example 1

The high molecular weight acrylic copolymer is 98 parts by weight of n-butyl acrylate as a polymerization monomer, 1 part by weight of acrylic acid, and 1 part by weight of 4-hydroxybutyl (meth)acrylate, 30 parts by weight of methyl ethyl ketone as a solvent, and polymerization initiation Zero azobisisobutyronitrile (AIBN) was placed in a reaction vessel in an amount of 0.012 parts by weight. Here, 1.0 parts by weight of γglycidoxypropyltrimethoxysilane was converted to a 30% siloxane structure by converting 1.0 parts by weight of the methoxysilane structure. Then, after replacing the air in the vessel with nitrogen gas to remove oxygen in the reaction vessel, the reaction solution was polymerized for 15 hours when the temperature was raised to 62° C. while stirring to prepare an acrylic copolymer.

The resulting solids were 20% molecular weight 250,000,000 Mw and a glass transition temperature (Tg) of 53 ℃ copolymer was prepared.

The medium molecular weight acrylic copolymer contains 99 parts by weight of n-butyl acrylate as a polymerization monomer, 1 part by weight of acrylic acid, 30 parts by weight of methyl ethyl ketone as a solvent, and 0.012 parts by weight of azobisisobutyronitrile (AIBN) as a polymerization initiator. was put into the reaction vessel. Here, 1.0 parts by weight of γglycidoxypropyltrimethoxysilane was converted to a 30% siloxane structure by converting 1.0 parts by weight of the methoxysilane structure. Then, after replacing the air in the vessel with nitrogen gas in order to remove oxygen in the reaction vessel, the reaction solution was polymerized for 8 hours when the temperature was raised to 62° C. while stirring to prepare an acrylic copolymer. A copolymer having a solid content of 16.6 and a molecular weight of 150,000,000 Mw and a glass transition temperature (Tg) of -49.5°C was prepared.

An acrylate mixture was prepared by mixing the high molecular weight acrylate copolymer and the medium molecular weight acrylate copolymer in a ratio of 1:0.8.

30% by weight of the total content (100 parts by weight) of the acrylate mixture, 25 parts by weight of solvent (toluene) (relative to 100 parts by weight of the monomer mixture), and the total content of the initiator (benzoyl peroxide) (0.08 compared to 100 parts by weight of the monomer mixture) parts by weight) of 30% by weight of the mixture was mixed in a reactor and nitrogen purge (purge), followed by the initiation reaction at 80 ℃. And after confirming the increase of the viscosity through the initial initiation reaction, the remaining monomer 70% by weight, 75 parts by weight of the solvent and 70% by weight of the initiator are dropped over 5 hours, and when the viscosity increases rapidly, a solvent is added to adjust the viscosity, After 30 minutes of dropping, at the time of reaching 80-85% conversion, 3 parts by weight of silane (3-(trimethoxysilyl)propyl methacrylate) was diluted to 10% in a solvent and dropped for 1 hour, The reaction was maintained until the conversion rate reached 100% or more, and the solvent was continuously dropped to adjust the final solid content of 35% by weight and cooled to room temperature to terminate the reaction to prepare an acrylic pressure-sensitive adhesive composition.

3 parts by weight of polymer beads 80H (polydecyl methacrylate, Sunjin Chemical) was added to 100 parts by weight of the acrylic pressure-sensitive adhesive composition to obtain a solid acrylic pressure-sensitive adhesive solution.

A TPU film (thickness 0.025 mm, T-MAX KG, SK F&C) prepared by stretching in the horizontal direction was inserted into a groove forming roller, and then grooves were formed on both surfaces of the film in the longitudinal direction. At this time, the grooves were formed with a depth of 80 μm and an interval between the grooves of 100 μm.

The acrylic pressure-sensitive adhesive solution was sprayed onto the grooved film by spraying, and the toluene was evaporated by exposure to the atmosphere for 30 seconds to form an adhesive layer having a viscosity of 3000 cps (25° C.) and a thickness of 30 μm. 0.5 parts by weight of a curing agent PAPI 135 (DOW Plasitics) was added to the pressure-sensitive adhesive solution, and the curing temperature was 130° C., and coating was performed at a coating speed of 25 m/min.

After the coating was completed, a release film was attached to both sides of the film to prepare an adhesive tape.

Example 2

The same procedure was performed in Example 1, except that the grooves were manufactured to have a depth of 1 μm and an interval of 2 μm.

Example 3

The same procedure was performed in Example 1, except that the grooves were manufactured to have a depth of 120 μm and an interval of 200 μm.

Example 4

In Example 1, the same procedure was performed except that 0.5 parts by weight of the polymer-based beads were included.

Example 5

The same procedure was performed except that 7 parts by weight of the polymer-based beads were used in Example 1.

Example 6

The same procedure was performed except that in Example 1, separation grooves having a depth of 0.01 mm were formed at intervals of 5 mm in the TPU film.

Example 7

In Example 1, a urethane resin layer containing tolylene diisocyanate was formed to a thickness of 10 μm as an active energy curing layer between the film and the pressure-sensitive adhesive, and the same was performed except that ultraviolet rays were irradiated for 10 seconds before separation. did.

Comparative Example 1

The same procedure was performed except that the polymer-based beads were not used in Example 1.

Comparative Example 2

It was carried out in the same manner as in Example 1, except that a groove was not formed on the surface of the TPU film.

Comparative Example 3

In Example 1, TESA 67210, a commercially available adhesive film, a double-sided adhesive tape having a thickness of 0.1 mm was used.

Test Example 1

A test was performed to measure the physical properties of Examples 1 to 7 and Comparative Examples 1 to 3

Adhesive force was measured according to SKT1107, and heat resistance retention was 25mm*25mm adhered to SUS 304, and then a 1kg weight was hung at 80℃, 90℃, 100℃, 110℃, 120℃ to measure the pushed distance after 1 hour.

Tensile force and elongation were measured according to ASTM D882.

The pull-out force was measured by forming a double-sided adhesive tape into a size of 10 mm * 20 mm, adhering it to glass, pressing it with a roller of 2 kg, and measuring the force pulling out in the horizontal direction after 1 hour. Here, the pull-out force means the force required when the double-sided adhesive tape is separated from the glass, which is an adherend, in the horizontal direction. That is, the higher the release force, the more difficult it is to separate, and the lower the release force, the easier it is to separate and there is no pressure-sensitive adhesive residue.

Adhesion (gf/in) Heat resistance (mm) Tensile force (gf) Elongation (%) dropout force
(gf/10*20mm) Example 1 1670 100℃, 2mm 2530 300 744.2 Example 2 1840 100℃, 2mm 2840 270 681.2 Example 3 1430 100℃, 4mm 2330 310 787.9 Example 4 1570 100℃, 3mm 2510 310 643.8 Example 5 1130 100℃, 2mm 2100 300 761.4 Example 6 1610 100℃, 2mm 2540 330 819.4 Example 7 1600 100℃, 2mm 2520 280 818.7 Comparative Example 1 1590 100℃, 4mm 2510 290 348.9 Comparative Example 2 1860 100℃, 2mm 2790 290 397.6 Comparative Example 3 1150 80℃2mm 2010 300 438.4

As shown in Table 1, in the case of Example 1 of the present invention, compared to the comparative example sold in the past, not only had a high adhesive force, but also had an excellent pull-out force, so it was found that almost no residue was formed during separation. In particular, in the case of Examples 6 and 7 having a separation groove and an active energy hardening layer, it was confirmed that the adhesive force was maintained as it is, while having a high detachment force.

However, in the case of Example 2 in which the grooves were densely formed, it was confirmed that the adhesive force was increased but the detachment force was decreased, and in the case of Example 3 having a deep and wide groove, it was confirmed that the adhesive force was decreased while the detachment force was increased on the contrary. That is, it was confirmed that the detachment force and the adhesive force can be adjusted by adjusting the depth and spacing of the grooves.

In addition, even in the case of polymer-based beads, it was shown that the pull-out force was decreased when it was added too little (Example 4). In the case of Example 5, which was excessively added, the pull-out force was increased, but the decrease in the adhesive force was significant.

Test Example 2

The adhesive strength was tested by applying the acrylic adhesive tape prepared in Example 1 to various adherends.

adherend steel aluminum copper polycarbonate polypropylene Adhesion (gf/in) 1640 1680 1640 1660 1670

As shown in Table 2, it was confirmed that even when the adherend was changed, it was confirmed that the acrylic adhesive tape of the present invention had high adhesion regardless of the type of the adherend.

In the above, preferred embodiments of the present invention have been illustrated and described, but the present invention is not limited to the specific embodiments described above, and it is common in the technical field to which the present invention pertains without departing from the gist of the present invention as claimed in the claims. Various modifications are possible by those having the knowledge of, of course, these modifications should not be individually understood from the technical spirit or prospect of the present invention.

100: thermoplastic polyurethane film
110: groove
120: break
200: adhesive
210: polymer-based beads
300: release film
400: active energy hardening layer
510: film manufacturing unit
520: groove forming roller
530: adhesive application means
540: laminating means

Claims (20)

Preparing a thermoplastic polyurethane film that can be stretched horizontally; and
coating an adhesive on the upper and lower surfaces of the polyurethane film;
In the method for manufacturing an easy-to-peel double-sided adhesive tape comprising:
The adhesive is
It is prepared by mixing acrylate, silane, initiator and solvent,
The thermoplastic polyurethane film layer comprises an active energy cured layer having ^{a storage modulus (G'a25) of less than 1.0x10 6} Pa, measured at a temperature of 25° C. and a frequency of 1.0 Hz,
The active energy curing layer comprises a polyurethane having a polymerizable unsaturated double bond and an acrylate compound having 2 to 4 polymerizable unsaturated double bonds,
The acrylate compound is a method for producing an acrylic adhesive tape that can be adhered regardless of the type of the adherend, characterized in that 5 to 30 parts by weight based on 100 parts by weight of the polyurethane having an unsaturated double bond.
According to claim 1,
The adhesive is
Preparing a mixed solution by mixing 3 to 10 parts by weight of silane, 0.05 to 0.1 parts by weight of an initiator, and a solvent based on 100 parts by weight of an acrylate
preparing a pressure-sensitive adhesive by adding 1 to 5 parts by weight of polymer-based beads to the mixed solution and mixing;
A method for producing an acrylic adhesive tape that can be adhered regardless of the type of adherend, characterized in that it is manufactured by a method comprising a.
3. The method of claim 2,
The silane is 3- (Trimethoxysilyl) propyl methacrylate (3- (Trimethoxysilyl) propyl methacrylate), characterized in that the adhesive regardless of the type of adherend, a method of manufacturing an acrylic adhesive tape.
3. The method of claim 2,
Before adding the polymer-based beads in the step of preparing the pressure-sensitive adhesive,
smooth surface treatment of the outer surface of the polymer-based bead;
applying a lubricant to the outer surface of the smooth surface-treated polymer-based beads; and
forming a protective layer by coating the mixed solution on the outer surface of the polymer-based beads to which the lubricant is applied;
A method of manufacturing an acrylic adhesive tape that can be adhered regardless of the type of the adherend, characterized in that it further comprises a.
3. The method of claim 2,
The polymer-based bead is a method of manufacturing an acrylic adhesive tape that can be adhered regardless of the type of the adherend, characterized in that it is made of polydecyl methacrylate.
6. The method of claim 5,
The method for producing an acrylic adhesive tape that can be adhered regardless of the type of the adherend, characterized in that the polymer-based beads have a particle size of 1 to 100 μm.
According to claim 1,
The step of preparing the thermoplastic polyurethane film,
After mixing the polyol and the isocyanate, preparing a thermoplastic polyurethane film through uniaxial stretching; and
forming grooves in the same direction as the stretching direction by pressing both sides of the film with a roller;
A method of manufacturing an acrylic adhesive tape that can be adhered regardless of the type of adherend, characterized in that it comprises a.
8. The method of claim 7,
The polyol is a polyether-based or polyester-based polyol,
The isocyanate is an aromatic isocyanate, an aliphatic isocyanate, or a method for producing an acrylic adhesive tape capable of being tacky regardless of the type of the adherend, characterized in that it is a combination thereof.
9. The method of claim 8,
The aromatic isocyanate is diphenylmethane diisocyanate (4,4'-Diphenylmethnae diisocyanate, MDI), polymeric diphenylmethane diisocyanate (polymeric 4,4'-Diphenylmethnae diisocyanate, PMDI), toluene diisocyanate (TDI), 1-4 phenylene diisocyanate (1,4-phenylene diisocyanate, PPDI) or 1,5-naphthalene diisocyanate (1,5-Naphthalene diisocyanate, NDI);
The aliphatic isocyanate is 1,6-hexamethylene diisocyanate (1,6-Hexamethylene diisocyanate, HDI), isophorone diisocyanate (Isoporon diisocyanate, IPDI) or dicyclohexylmethane-4,4'-diisocyanate (Dicyclohexylmethane-4) ,4'-diisocyanate, H12MDI), a method of manufacturing an acrylic adhesive tape that can be adhered regardless of the type of adherend.
8. The method of claim 7,
The groove has a depth of 0.1 ~ 100㎛, characterized in that formed at intervals of 0.1 ~ 200㎛ method of manufacturing an acrylic adhesive tape that can be adhered regardless of the type of adherend.
11. The method of claim 10,
Wherein the groove comprises a front groove formed on one surface of the film and a rear groove formed on the other surface of the film.
12. The method of claim 11,
The rear groove is formed parallel to the front groove, and is formed to be equally spaced from the front groove.
12. The method of claim 11,
The rear groove is formed parallel to the front groove, and is formed to have a different distance from the front groove.
According to claim 1,
The double-sided adhesive tape,
a) a thermoplastic polyurethane film layer having a predetermined length and width and separated into two or more pieces along the entire length and width by an external force; and
b) an adhesive coated on both sides of the thermoplastic polyurethane film layer;
A method of manufacturing an acrylic adhesive tape capable of being adhesive regardless of the type of adherend, characterized in that it comprises a.
15. The method of claim 14,
The method for producing an acrylic adhesive tape that can be adhered regardless of the type of the adherend, characterized in that the thermoplastic polyurethane film layer has a density of 20 to 400 kg/m3.
15. The method of claim 14,
The thermoplastic polyurethane film layer is a method of manufacturing an acrylic adhesive tape that can be adhered regardless of the type of adherend, characterized in that it includes a foam-containing substrate.
15. The method of claim 14,
The method for producing an acrylic adhesive tape that can be adhered regardless of the type of the adherend, characterized in that the thermoplastic polyurethane film layer has a thickness of 175 μm to 100 mm.
According to claim 1,
The method for producing an acrylic adhesive tape that can be adhered regardless of the type of the adherend, characterized in that the active energy cured layer has a thickness of 10 μm or more.
According to claim 1,
The active energy curing layer is tolylene diisocyanate, chlorophenylene diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, xylylene diisocyanate, isophorone diisocyanate, diphenylmethane diiso A method for producing an acrylic adhesive tape that can be adhered regardless of the type of adherend, comprising at least one polyisocyanate selected from the group consisting of cyanate and hydrogenated diphenylmethane diisocyanate.
[Claim 20] An acrylic adhesive tape capable of sticking regardless of the type of adherend produced by the method of any one of claims 1 to 19.

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