KR102122602B1 - The adhesive composition and the adhesive film - Google Patents

Abstract

It is formed from a mixed monomer component comprising a first alkyl (meth)acrylate having an alkyl group having 4 to 15 carbon atoms, a second alkyl (meth)acrylate having an alkyl group having 1 to 3 carbon atoms, and acrylic acid, and has a weight average molecular weight (Mw ) Is 5 to 10 million photopolymerizable resin; And it includes a crosslinkable monomer, the content of the crosslinkable monomer is provided with an adhesive composition of more than 0 to 0.2 parts by weight or less compared to 100 parts by weight of the photopolymerizable resin.

Description

Adhesive composition and adhesive tape {THE ADHESIVE COMPOSITION AND THE ADHESIVE FILM}

It relates to an adhesive composition and an adhesive tape.

Demand for an image display device that inputs, manipulates, and displays information through a touch screen, such as a television, computer, and mobile communication terminal, is increasing. The image display device includes a protection unit such as a glass substrate or a transparent plastic substrate on an image display unit such as a liquid crystal display (LCD), and an image, image, or the like is not transmitted through the border area of the image display device because light is not transmitted. It can be formed from the portion where the display does not appear, including the distal portion of the main body of the image display device.

The edge region of the image display device is called a bezel, and in this bezel, the image display unit and the protection unit of the image display device may be adhered via an adhesive tape, that is, a double-sided adhesive tape.

In addition, while the demand for expanding the size of the image display unit continues to increase these days, there are many demands for the device itself not to grow. To meet this demand, attempts have been made to reduce the size or width of the bezel. As such, the need for an adhesive tape for application to a narrow bezel is also increasing. In order to be applied to a narrow bezel, the adhesive tape must be easily processed and cut so as to correspond to the shape of the narrow bezel, and despite a small area, it must exhibit excellent adhesive performance during the manufacturing process and after use.

One embodiment of the present invention, when applied to a narrow bezel, exhibits excellent processability and adhesion, has excellent repellency in an environment of high temperature and high humidity, and provides an adhesive composition having no change over time.

Another embodiment of the present invention is an adhesive tape manufactured using the adhesive composition, and is applied to a narrow bezel to provide an adhesive tape having excellent reliability and adhesive performance in a high temperature and high humidity environment, and no change over time.

One embodiment of the present invention is formed from a mixed monomer component comprising a first alkyl (meth)acrylate having an alkyl group having 4 to 15 carbon atoms, a second alkyl (meth)acrylate having an alkyl group having 1 to 3 carbon atoms, and acrylic acid A photopolymerizable resin having a weight average molecular weight (Mw) of 5 to 10 million; And it includes a crosslinkable monomer, the content of the crosslinkable monomer provides a pressure-sensitive adhesive composition of more than 0 0.2 parts by weight or less compared to 100 parts by weight of the photopolymerizable resin.

Another embodiment of the present invention provides an adhesive tape having an adhesive layer containing a photocured product of the adhesive composition.

The pressure-sensitive adhesive composition can exhibit excellent processability and cutability when applied to a narrow bezel area, and exhibits excellent repulsion resistance and adhesion under a high temperature and high humidity environment even for a small area, and implements proper adhesion to a plastic substrate, resulting in processability and cutability Improve it.

The adhesive tape exhibits excellent cutability in the process of forming and processing to be applied to a narrow bezel area, reducing the defect rate of mass production based on proper adhesion to a plastic substrate, and having excellent repulsion resistance and high temperature and high humidity reliability. Can be implemented. In addition, the adhesive tape can realize stable physical properties without change over time.

1 schematically illustrates a cross-section of an adhesive tape according to an embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to embodiments described below. However, the present invention will not be limited to the embodiments disclosed below, but will be implemented in various different forms, Only the present embodiments are provided to make the disclosure of the present invention complete, and to provide those who have ordinary knowledge in the art to which the present invention pertains, to fully disclose the scope of the invention, and the invention is defined by the scope of the claims. It just works. The same reference numerals refer to the same components throughout the specification.

In the drawings, the thickness is enlarged to clearly express the various layers and regions. In the drawings, thicknesses of some layers and regions are exaggerated for convenience of description.

Also, in the present specification, when a part such as a layer, film, region, plate, etc. is said to be "above" or "above" another part, this is not only when the other part is "directly above" but also when there is another part in the middle. Also includes. Conversely, when one part is "just above" another part, it means that there is no other part in the middle. In addition, when a part such as a layer, film, region, plate, etc. is said to be "below" or "below" another part, it is not only when the other part is "just below" but also when there is another part in the middle. Includes. Conversely, when one part is "just below" another part, it means that there is no other part in the middle.

In one embodiment of the present invention, from a mixed monomer component comprising a first alkyl (meth)acrylate having an alkyl group having 4 to 15 carbon atoms, a second alkyl (meth)acrylate having an alkyl group having 1 to 3 carbon atoms, and acrylic acid It is formed, the weight average molecular weight (Mw) of 5 to 10 million photopolymerizable resin; And it includes a crosslinkable monomer, the content of the crosslinkable monomer provides a pressure-sensitive adhesive composition of more than 0 0.2 parts by weight or less compared to 100 parts by weight of the photopolymerizable resin.

The pressure-sensitive adhesive composition includes a photopolymerizable resin, and the weight average molecular weight (Mw) of the photopolymerizable resin may be about 5 million to about 10 million. For example, it may be from about 6 million to about 10 million, or from about 7 million to about 10 million. The pressure-sensitive adhesive composition may include a photopolymerizable resin having a weight average molecular weight within the above range, thereby improving initial adhesion to a plastic substrate, and increasing adhesion retention under a high temperature and high humidity environment.

In addition, unlike the resin having a weight average molecular weight (Mw) of less than about 5 million, which has been used in an adhesive, the photopolymerizable resin having the weight average molecular weight has a high cohesive force and can exhibit high resistance to heat, thereby improving initial adhesion. It is possible to increase the adhesive holding power under a high temperature and high humidity environment.

Typically in the bezel of the display, for example, glass and plastic; Or glass and metal; The image display unit and the protection unit, which are formed of different materials, are adhered via an adhesive tape, and the adhesive tape may be formed of, for example, an acrylic adhesive.

However, the acrylic adhesive that is commonly used may have a problem of lifting or foaming under high temperature and high humidity conditions or even desorption when the components of different materials are adhered to each other due to low repulsion resistance.

In addition, even in the case of a pressure-sensitive adhesive that initially exhibits adequate adhesive strength and rebound resistance, there may be a problem of change over time, such as a large drop in initial adhesive strength and a large drop in repellency over time.

The pressure-sensitive adhesive composition, including the crosslinkable monomer together with the photopolymerizable resin, can realize excellent repulsion resistance and excellent high temperature and high humidity reliability, and can prevent lifting, bubble generation, and desorption. Specifically, the crosslinkable monomer may realize the above-described effect by forming a crosslinking structure connecting the photopolymerizable resin by reacting with the photopolymerizable resin.

In addition, the content of the crosslinkable monomer may be greater than about 0 and about 0.2 parts by weight or less compared to 100 parts by weight of the photopolymerizable resin. When the pressure-sensitive adhesive composition contains a crosslinkable monomer in an amount in the above range, it is possible to impart stable physical properties with little change over time to the pressure-sensitive adhesive tape prepared therefrom.

Specifically, the content of the crosslinkable monomer does not exceed about 0.2 parts by weight compared to 100 parts by weight of the photopolymerizable resin, so that the crosslinkable monomer reacts sufficiently with the photopolymerizable resin to form an appropriate crosslinking structure, but unreacted to the adhesive tape after the reaction. It may not remain in the state. Accordingly, the adhesive tape can maintain the initial adhesive strength, high adhesive retention under high temperature and high humidity environments, and excellent repulsion resistance as time passes. That is, the pressure-sensitive adhesive composition containing a crosslinkable monomer in the above range can provide stable physical properties with little change over time.

The crosslinkable monomer may be a material having no crosslinking reactivity at normal temperature and crosslinking reactivity under high temperature and high humidity. In the present specification, the term'crosslinking reactivity' refers to physical properties in which both ends react chemically to form a bond in the chemical structure of a crosslinkable monomer. That is, the crosslinkable monomer does not crosslink at either end or both ends at room temperature, and both ends react chemically at high temperatures to exhibit crosslinking reactivity.

The crosslinking monomer does not undergo a crosslinking reaction at room temperature, and both ends of the crosslinkable monomer are reacted with the photopolymerizable resin to form a crosslinking structure under conditions of high temperature and high humidity, thereby providing an appropriate crosslinking density and excellent flexibility to the pressure-sensitive adhesive composition. can do. As a result, the pressure-sensitive adhesive tape made of the pressure-sensitive adhesive composition can achieve high repulsion resistance and excellent high-temperature and high-humidity reliability, thereby preventing lifting, bubble generation and desorption.

The crosslinkable monomer capable of forming a crosslinked structure by reacting with a photopolymerizable resin may be (meth)acrylate having an oxygen-containing heterocycloalkyl group. The (meth)acrylate having an oxygen-containing heterocycloalkyl group includes glycidyl group-containing (meth)acrylate, oxetane group-containing (meth)acrylate, tetrahydrofurfuryl group-containing (meth)acrylate, and combinations thereof. It may be one selected from the group consisting of.

The glycidyl group-containing (meth)acrylate is a glycidyl group-containing (meth)acrylate having a triangular ring, and has an advantage of excellent crosslinking reactivity than a (meth)acrylate having a tetragonal or more ring structure functional group. Specifically, the glycidyl group-containing (meth)acrylate having a triangular ring has excellent ring-opening reaction under conditions of high temperature and high humidity, compared to other oxygen-containing heterocycloalkyl group-containing (meth)acrylates having four or more rings, It can easily react with the photopolymerizable resin to better form a crosslinking structure connecting the photopolymerizable resins. Accordingly, the pressure-sensitive adhesive composition provides excellent adhesion and repellency, and the pressure-sensitive adhesive tape made of the pressure-sensitive adhesive composition can realize stable physical properties with little change over time.

For example, the glycidyl group-containing (meth)acrylate may have the structure of Formula 1 below. In this case, R ₁ is hydrogen or a methyl group, and m may be an integer from 0 to 10.

[Formula 1]

The glycidyl group-containing (meth)acrylate contains a glycidyl group having a triangular ring, as in Chemical Formula 1, and as described above, under conditions of high temperature and high humidity, the ring of the glycidyl group is opened. , Reacting with the photopolymerizable resin may form a crosslinking structure connecting the photopolymerizable resins.

At this time, m may be an integer from 0 to 10. When m satisfies the above range, the crosslinkable monomer can impart an appropriate level of crosslinking density, whereby the adhesive composition can realize excellent flexibility, rebound resistance, and stable physical properties with little change over time.

The crosslinkable monomer may further include (meth)acrylate having a glycidyl group-containing (meth)acrylate and another oxygen-containing heterocycloalkyl group.

For example, the crosslinkable monomer may further include an oxetane group-containing (meth)acrylate or a tetrahydrofurfuryl group-containing (meth)acrylate.

As described above, the crosslinkable monomer does not have crosslinking reactivity at room temperature, and is a material having crosslinking reactivity under high temperature and high humidity. Specifically, the crosslinkable monomer is about 60°C to about 90°C and about 50% to about It may have crosslinking reactivity at a relative humidity of 90%.

The crosslinkable monomer is a material having crosslinking reactivity under high temperature and high humidity, and is a separate component distinct from the monomer of the mixed monomer component constituting the photopolymerization resin, and exists in the adhesive composition as an unreacted monomer. .

As described below, the pressure-sensitive adhesive composition may form a photocured product by irradiating light energy, wherein the crosslinkable monomer does not exhibit crosslinking reactivity. Specifically, when irradiating light energy, at least some of the crosslinkable monomers may have a photocuring reaction with an acrylate group of the photopolymerizable resin, but the oxygen-containing heterocycloalkyl group of the crosslinkable monomer does not crosslink. That is, the oxygen-containing heterocyclo alkyl group of the crosslinkable monomer is present in a free state even after curing of the pressure-sensitive adhesive composition. This may be possible by appropriately controlling the chemical structure and composition of the crosslinkable monomer and setting the curing conditions, temperature, and humidity appropriately in the curing step of the pressure-sensitive adhesive composition.

The crosslinkable monomer is capable of imparting appropriate crosslinking density and excellent flexibility by crosslinking with the photopolymerizable resin when the pressure-sensitive adhesive composition is photocured and the photocured product is placed under conditions of high temperature and high humidity, resulting in high temperature and high humidity. It can show excellent adhesion and reliability under the environment. In addition, as described above, the crosslinking monomer is included in the pressure-sensitive adhesive composition in an amount of 0 to 0.2 or less by weight, compared to 100 parts by weight of the photopolymerizable resin, thereby performing initial cross-linking reaction even after a period of time. Excellent repulsion resistance can be maintained.

The crosslinkable monomer constitutes an adhesive composition together with a photopolymerizable resin formed by photopolymerization, thereby exhibiting high cohesiveness and high resistance to heat, consequently improving the initial adhesion, and improving the adhesion retention under an environment of high temperature and high humidity. Excellent repulsion resistance can be achieved. In addition, since the adhesive tape prepared by the adhesive composition maintains initial adhesive strength and repellency even after a period of time, stable physical properties without change over time can be realized.

The pressure-sensitive adhesive composition includes a photopolymerization resin, and the photopolymerization resin is a polymer synthesized from one or more monomers by irradiating light energy such as ultraviolet rays as being distinguished from a thermal polymerization resin. In the process of manufacturing the photopolymerizable resin, a resin having a high weight average molecular weight can be prepared as described above by appropriately adjusting the light amount and temperature conditions, and through this, excellent physical properties as described above can be realized.

Specifically, the photopolymerizable resin is formed from a mixed monomer component comprising a first alkyl (meth)acrylate having an alkyl group having 4 to 15 carbon atoms, a second alkyl (meth)acrylate having an alkyl group having 1 to 3 carbon atoms, and acrylic acid. Can be. For example, the photopolymerizable resin may be formed from a mixed monomer component composed of only the first alkyl (meth)acrylate, the second alkyl (meth)acrylate, and acrylic acid.

The mixed monomer component forming the photopolymerizable resin may include about 20% to about 40% by weight of the second alkyl (meth)acrylate. Specifically, it may include about 20% to about 30% by weight. Since the photopolymerizable resin is prepared from a mixed monomer component containing a second alkyl (meth)acrylate in the above range, high peel strength to a plastic substrate can be realized, and as a result, excellent processability in the process of cutting and forming an adhesive tape Can represent In addition, the repulsion resistance is low, and it is possible to prevent the occurrence of excitation, bubbles, etc. in an environment of high temperature and high humidity.

The second alkyl (meth)acrylate has an alkyl group having 1 to 3 carbon atoms, and specifically, may have a linear or pulverized alkyl group having 1 to 3 carbon atoms. Since the second alkyl (meth)acrylate has a linear or pulverized alkyl group in the carbon number range, it is possible to easily control the initial adhesive strength and peel strength to the plastic substrate of the adhesive to a required level.

On the other hand, when the mixed monomer component forming the photopolymerizable resin contains a (meth)acrylate having a cyclo group, the chain length becomes longer, the molecular weight may be increased, and the glass transition of the resin formed from the mixed monomer component containing the same The temperature increases. The photopolymerizable resin formed therefrom is not easy to form a crosslinked structure by reacting with a crosslinkable monomer, and it is not easy to control adhesion and repulsion resistance to required levels.

Meanwhile, a photopolymerizable resin formed from a mixed monomer component containing the second alkyl (meth)acrylate may react with a crosslinkable monomer to form an appropriate crosslinking structure. Accordingly, the pressure-sensitive adhesive composition comprising the photopolymerizable resin and the crosslinkable monomer can maintain high adhesion retention and excellent repellency even after a period of time.

The glass transition temperature (Tg) may be about 5 °C to about 20 °C, specifically about 5 °C to about 15 °C. By including the second alkyl (meth)acrylate having the glass transition temperature in the above range of the mixed monomer component, it is possible to realize a high peeling force to the plastic substrate, and as a result, excellent processability in the cutting and molding process of the adhesive tape. Can be represented. In addition, the repulsion resistance is low, and it is possible to prevent the occurrence of excitation, bubbles, etc. in an environment of high temperature and high humidity.

Specifically, the second alkyl (meth) acrylate may include one selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, and combinations thereof. The shorter the length of the alkyl group in the second alkyl (meth)acrylate, the easier it is to adjust the cohesive force, glass transition temperature and adhesion of the photocured product. For example, the second alkyl (meth) acrylate may include methyl acrylate (MA), and in this case, the length of the alkyl group is short, thereby providing excellent cohesion to the cured product. In this case, it may be particularly advantageous in terms of increasing the peel strength to the plastic substrate.

The second alkyl (meth)acrylate has an alkyl group having a relatively short length, and in some cases, a problem that causes a peculiar fragrance may occur. For example, the methyl acrylate (MA) has an intrinsic fragrance, and there is a limitation that the adhesive is not contained in a certain amount or more. In one embodiment, the pressure-sensitive adhesive composition is used for application to a bezel of a small area, thereby minimizing the effect of this scent, and by using the second alkyl (meth)acrylate at a required level, excellent Advantages of realizing physical properties can be secured.

The mixed monomer component may include about 6% to about 8% by weight of the acrylic acid. By adjusting the content of the acrylic acid to the appropriate range, the pressure-sensitive adhesive composition may have excellent adhesion and excellent repellency under high temperature and high humidity environments.

Specifically, the pressure-sensitive adhesive composition comprises both a photopolymerizable resin formed from a mixed monomer component containing acrylic acid in the above-described range, thereby providing both initial adhesion suitable for application to a narrow bezel portion, adhesion retention under a high temperature and high humidity environment, and excellent repulsion resistance. Can be secured. In addition, the pressure-sensitive adhesive composition may impart stable physical properties with little change over time.

The acrylic acid is a monomer having high polarity, and can adhere to an adherend. Specifically, the acrylic acid interacts with a functional group on the surface of the adherend to increase the adhesive force over time, and the peelability of the adhesive tape formed from the pressure-sensitive adhesive composition may decrease. Thus, by containing the acrylic acid in the content of the above range, the pressure-sensitive adhesive composition can impart initial adhesion suitable for application to a narrow bezel portion and adhesion retention under a high temperature and high humidity environment.

Further, the acrylic acid may react with the crosslinkable monomer. Specifically, the pressure-sensitive adhesive composition may include a glycidyl group-containing (meth)acrylate that is a crosslinkable monomer in addition to the photopolymerization resin formed from the mixed monomer component containing the acrylic acid. At this time, the glycidyl group-containing (meth)acrylate may form a cross-linking structure connecting the photopolymerizable resins by reacting with the photopolymerizable resin while the ring of the glycidyl group is opened under conditions of high temperature and high humidity. As a result, the pressure-sensitive adhesive composition can implement an appropriate crosslinking density and excellent flexibility.

In addition, in the pressure-sensitive adhesive composition, the mixed monomer component contains acrylic acid in an amount in the above range, and at the same time, the photopolymerizable resin prepared from the mixed monomer component has a weight average molecular weight in the aforementioned range, and crosslinking reacts with the photopolymerizable resin. By having the content of the above-described range of the sex monomer, it is possible to secure both the initial adhesion of the required level and excellent repellency. And, even after a period of time, it is possible to impart stable physical properties with no change over time, such as maintaining the adhesive force and repulsion resistance.

The mixed monomer component for preparing the photopolymerizable resin may include the first alkyl (meth)acrylate together with the second alkyl (meth)acrylate and the acrylic acid. For example, the mixed monomer component may be composed of only the first alkyl (meth) acrylate, the second alkyl (meth) acrylate, and acrylic acid. At this time, the mixed monomer component includes about 6% by weight to about 8% by weight of acrylic acid as described above, and at the same time may include a second alkyl (meth)acrylate in the above-described range of content, furthermore, The content of the first alkyl (meth)acrylate may be determined so that the total sum is 100% by weight.

The first alkyl (meth)acrylate has an alkyl group having 4 to 15 carbon atoms, and provides excellent initial adhesion of the pressure-sensitive adhesive through its type and content, and can easily control the adhesion to a required level.

Specifically, the first alkyl (meth) acrylate may have a straight or pulverized alkyl group having 4 to 15 carbon atoms. Since the first alkyl (meth)acrylate has a straight or pulverized alkyl group in the carbon number range, it is possible to easily control the initial adhesive strength and peel strength to the plastic substrate of the adhesive to a required level.

More specifically, the first alkyl (meth)acrylate may include one selected from the group consisting of ethylhexyl (meth)acrylate, butyl (meth)acrylate, isooctyl (meth)acrylate, and combinations thereof. have.

The pressure-sensitive adhesive composition may contain 8 to 12% by weight of the photopolymerizable resin. Specifically, the photopolymerizable resin is formed by photopolymerization of a mixed monomer component comprising a first alkyl (meth)acrylate, a second alkyl (meth)acrylate, and acrylic acid, and by including a photopolymerization resin in a content within the above range, While implementing a sufficiently good level of adhesion, the viscosity may not be excessively increased.

In addition, the pressure-sensitive adhesive composition, as described above, by containing 8 to 12% by weight of a photopolymerizable resin and 100 parts by weight of the photopolymerizable resin compared to 0 to 0.2 parts by weight of crosslinkable monomer, high adhesion at high temperature and excellent repulsion resistance It can be applied, and the adhesive strength and repulsion resistance can be maintained as time passes.

The pressure-sensitive adhesive composition may further include one selected from the group consisting of a photo-curable monomer, a photo-curing agent, a photo-initiator, and combinations thereof, apart from the photopolymerizable resin and the crosslinkable monomer.

The photo-curable monomer is different from the cross-linkable monomer, and is a compound capable of chemically bonding to the photo-polymerizable resin by irradiation of light energy at room temperature or performing a polymerization reaction between photo-curable monomers, through which the adhesive composition Silver photocuring can achieve an appropriate gel content (hardening degree).

The photocurable monomer may include the same type of monomer as the monomer of the mixed monomer component constituting the photopolymerization resin. More specifically, the photocurable monomer may be derived from a mixed monomer component used in the production of the photopolymerizable resin, but both are distinguished from each other, and unlike the mixed monomer component, exist in a monomer form in the pressure-sensitive adhesive composition. . At this time, the photo-curable monomers play a different role from the mixed monomer components constituting the photopolymerization resin in the process of curing the pressure-sensitive adhesive composition by light energy. Therefore, even if the monomer of the mixed monomer component and the photocurable monomer are the same compound, both have different influences on related properties, such as the adhesion retention performance, initial adhesion, and repellency of the pressure-sensitive adhesive composition.

In addition, the photo-curable monomer is from the group consisting of other alkyl (meth) acrylate, hydroxyl group-containing (meth) acrylate, carboxyl group-containing (meth) acrylate, and combinations thereof, in addition to the mixed monomer component used in the production of the photopolymerizable resin. It may further include a selected one.

For example, the alkyl (meth)acrylate is the first alkyl (meth)acrylate having an alkyl group having 4 to 15 carbon atoms, the second alkyl (meth)acrylate having an alkyl group having 1 to 3 carbon atoms, 16 carbon atoms It may include one selected from the group consisting of alkyl (meth) acrylate and a combination thereof having the above alkyl group, but is not limited thereto.

Examples of the hydroxy group-containing (meth)acrylate include one selected from the group consisting of 2-hydroxyethyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 2-hydroxyethylacrylamide, and combinations thereof. It may include, but is not limited thereto.

Examples of the carboxyl group-containing (meth)acrylate include β-carboxyethyl (meth)acrylate, (meth)acrylic acid, itaconic acid, maleic acid, fumaric acid, vinyl acetate, acrylic acid, methacrylic acid, fumaric acid, maleic acid and their It may include one selected from the group consisting of a combination, but is not limited thereto.

In addition, the photocuring agent is 2,4-trilene diisocyanate, 2,6-triene diisocyanate, hydrogenated trilene diisocyanate, 1,3-xylene diisocyanate, 1,4-xylene diisocyanate, diphenyl methane- 4,4-diisocyanate, 1,3-bisisocyanatomethyl cyclohexane, tetra methyl xylene diisocyanate, 1,5-naphthalene diisocyanate, 2,2,4-trimethyl hexamethylene diisocyanate, 2,4,4- Selected from the group consisting of trimethyl hexamethylene diisocyanate, trimethylene diisocyanate adduct of trimethylolpropane, xylene diisocyanate adduct of trimethylolpropane, toriphenylmethanetoriisocyanato, methylene bis triisocyanate, and combinations thereof. It may include one, but is not limited thereto. The photocuring agent can increase the degree of crosslinking of the photocurable resin, and can easily control the initial adhesion and peel strength to required levels.

In addition, the photoinitiator is an alpha-ketone-based compound, acetophenone-based compound, ketal-based compound, aromatic sulfonyl chloride-based compound, photoactive oxime-based compound, benzophenone-based compound, thioxanthone-based compound, campoquinone-based compound, halogenated ketone -Based compound, acylphosphine oxide-based compound, acylphosphonate-based compound, and combinations thereof, but may not be limited thereto. The photoinitiator is activated by radiation or ultraviolet rays, and acts to initiate a curing reaction by activating a double bond between carbons.

The pressure-sensitive adhesive composition may be applied to the bezel portion of the display, wherein the width of the bezel portion may be about 2 mm to about 5 mm.

In a device including a display, a bezel portion corresponding to an edge of a display screen is gradually narrowing in line with a recent trend to expand a display. At this time, the pressure-sensitive adhesive composition may be applied to a bezel portion having a narrow width of about 2 mm to about 5 mm, and may exhibit excellent adhesion performance to an area.

In addition, excellent processability can be realized in a process in which the adhesive tape manufactured using the adhesive composition is molded and cut into a shape suitable for a bezel portion having a narrow width. In the case of a general adhesive tape, when cutting to have a narrow shape, there is a problem in that the adhesive is stuck to the cutting tool and difficult to manufacture in a desired shape. However, although the adhesive composition is cut to have a narrow width shape of the adhesive tape prepared using the adhesive composition, the cutting interface may be cut with a clean contour. In addition, the part that is cut and released is attached to the plastic substrate and is released. By using the pressure-sensitive adhesive composition, it can exhibit a high peel strength to the plastic substrate, which can help accurate release, and as a result, a defective rate in the manufacturing process of the adhesive tape. Can be reduced.

In addition, the pressure-sensitive adhesive composition may be applied to a narrow bezel portion of a display to exhibit excellent adhesion retention and excellent repulsion resistance under a high temperature and high humidity environment, and implement excellent adhesion performance to an area. And, even after a period of time, it is possible to maintain the initial excellent adhesion retention and excellent repellency.

In another embodiment of the present invention, there is provided an adhesive tape having an adhesive layer comprising a photocured product of the adhesive composition.

The pressure-sensitive adhesive layer is prepared using the pressure-sensitive adhesive composition, may be specifically formed of a photocured product of the pressure-sensitive adhesive composition. As a result, the adhesive layer can secure initial adhesion to a plastic substrate and adhesion retention under a high temperature and high humidity environment in an appropriate range, and at the same time, excellent repellency. In addition, there is no change over time, so that stable physical properties can be realized. As a result, the adhesive tape can secure properties suitable for application to the display bezel portion as described above.

The photocured product may be formed by irradiating light energy to the pressure-sensitive adhesive composition, and may be formed by curing the photopolymerization resin in the pressure-sensitive adhesive composition by specifically irradiated light energy. In this case, the photocured product may include a crosslinkable monomer containing a glycidyl group-containing (meth)acrylate. For example, the glycidyl group of the crosslinkable monomer contained in the photocured product may exist in a free state.

Specifically, the photocured product may be formed by photocuring the pressure-sensitive adhesive composition at room temperature. The room temperature may be about 23 ℃ to about 25 ℃. At this time, the glycidyl group-containing (meth)acrylate, which is a crosslinkable monomer included in the pressure-sensitive adhesive composition, is a material having crosslinking reactivity under high temperature and high humidity as described above, and does not crosslink in a photocuring reaction in the temperature range. .

Specifically, in the photocuring reaction in the above temperature range, the ring of the glycidyl group-containing (meth)acrylate is not opened and does not react with the photopolymerization resin, and thus does not form a crosslinking structure connecting the photopolymerization resins. That is, the glycidyl group-containing (meth)acrylate is present as a monomer in the photocured product.

The adhesive tape may be placed in an environment of high temperature and high humidity during or after the process of being applied to the final product. At this time, the conventional acrylic adhesive tape may have problems such as low adhesion and low rebound resistance in high temperature and high humidity environments, such as excitation, air bubbles, and the like. In addition, as time elapses, the adhesive force and repellency may deteriorate rapidly.

In one embodiment, the adhesive tape may realize excellent physical properties by a crosslinking reaction of the crosslinkable monomer under a high temperature and high humidity environment by including an adhesive layer composed of a photocured product containing a crosslinkable monomer. That is, the crosslinkable monomer can be imparted with excellent flexibility and tackiness to the adhesive layer by performing a crosslinking reaction with the photopolymerizable resin in an environment of high temperature and high humidity.

In addition, the pressure-sensitive adhesive tape may contain a crosslinkable monomer in an amount in the above-described range, so that it can maintain excellent flexibility and adhesion even after a period of time. That is, the adhesive tape can realize stable physical properties with little change over time.

In addition, the pressure-sensitive adhesive layer containing a photocured product of the pressure-sensitive adhesive composition may have a gel content (hardening degree) of about 40% to about 60%. The'gel content' may be calculated by Equation 1 below.

[Equation 1]

Gel content (%) = W ₂ / W ₁ * 100

In Equation 1, the W ₁ refers to the'first mass' obtained by measuring the mass of the target hardened material specimen to measure the gel content, and the W ₂ is immersed in the solvent in the initial mass of the hardened specimen specimen at room temperature. It means'later mass', which is the mass (mass) of a specimen obtained by leaving it for a certain period of time, filtering it using a strainer, and drying the remaining specimen at a constant temperature for a period of time.

The solvent may be, for example, chloroform, ethyl acetate, acetone, methanol, ethanol, isopropanol, butanol, dimethylformamide, and the like, and the filtering device may use, for example, about 200 mesh wire mesh, but is not limited thereto. It does not work.

The time for immersing the specimen in a solvent and allowing it to stand can be left for, for example, about 24 to about 48 hours, but it is sufficient as long as other components except the gel can be dissolved and separated in the solvent, and is not particularly limited. .

In addition, the conditions of the temperature and time for drying the specimen obtained by the filtering device may be, for example, from about 100°C to about 150°C, for about 1 hour to about 2 hours, but a temperature sufficient to dry the specimen. And under conditions of time, it is not particularly limited.

The gel content of the adhesive layer satisfies the above range, thereby maintaining an appropriate cohesive force, and may have an effect of maintaining an adhesive force in an environment of high temperature and high humidity. Through this, it is possible to realize excellent adhesion and at the same time to secure processability.

1 is a cross-sectional view schematically showing a cross-section of an adhesive tape according to an embodiment. When referring to this, the adhesive tape 100 may be, for example, a double-sided adhesive tape. In this case, specifically, the adhesive tape may have a structure including a core material 10 and an adhesive layer 20 obtained by photocuring the pressure-sensitive adhesive composition on both sides of the core material.

As described above, it is formed from a mixed monomer component comprising a first alkyl (meth) acrylate, a second alkyl (meth) acrylate and acrylic acid contained in the pressure-sensitive adhesive composition, the weight average molecular weight (Mw) is 5 million to Due to the photopolymerization resin of 10 million, the adhesive tape can secure an appropriate adhesive force in an environment of high temperature and high humidity. In addition, the crosslinkable monomer of 0 to 0.2 or less by weight compared to 100 parts by weight of the photopolymerizable resin contained in the pressure-sensitive adhesive composition may react with the photopolymerizable resin to form a crosslinking structure connecting the photopolymerizable resins. As a result, an appropriate crosslinking density and excellent flexibility can be imparted to the pressure-sensitive adhesive composition, and stable physical properties without change over time can be imparted.

Accordingly, the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition can secure an appropriate adhesion under an environment of high temperature and high humidity, and at the same time, flexibility can be increased to an appropriate level to realize excellent repulsion resistance and excellent high temperature and high humidity reliability, thereby generating excitation, air bubbles, and There is an advantage that can prevent the desorption phenomenon. In addition, since there is no change over time, the adhesive layer may realize stable physical properties that maintain the excellent effect as described above, even over time.

As described above, the adhesive tape may be applied to the display bezel portion, and the bezel portion may have a width of about 2 mm to about 5 mm.

For the core material, for example, a foamed substrate such as acrylic foam, polyethylene foam, polyurethane foam, or the like may be used, and plastics such as polyethylene terephthalate (PET) film, polycarbonate (PC) film, and polyvinyl chloride (PVC) film may be used. Films can also be used.

At this time, the thickness of the core material may be about 50 μm to about 55 μm. Further, the thickness of the adhesive layer may be about 100 μm to about 110 μm. Since the core material and the adhesive layer have a thickness in the above range, the entire thickness of the device including the display may be applied to the bezel portion without excessively thick, thereby exhibiting proper adhesive performance and adhesive retention. In addition, high efficiency of the process for manufacturing the adhesive tape can be secured.

Hereinafter, specific embodiments of the present invention are presented. However, the examples described below are only for specifically illustrating or describing the present invention, and the present invention should not be limited thereby.

< Example And Comparative example >

Example One

A mixed monomer component was prepared by mixing 5% by weight of acrylic acid (AA), 25% by weight of methyl acrylate (MA), and 70% by weight of ethylhexyl acrylate (EHA). A photopolymerizable resin having a weight average molecular weight (Mw) of 8 million was prepared from the mixed monomer component through photopolymerization. 10% by weight of the photopolymerizable resin, 90 parts by weight of a photocurable monomer compared to 100 parts by weight of a photopolymerizable resin, 0.1 parts by weight of HDDA as a photocuring agent, 0.3 parts by weight of Irg651 as a photoinitiator, and glycine of m=0 in Chemical Formula 1 A pressure-sensitive adhesive composition was prepared comprising 0.1 parts by weight of dill methacrylate (100 parts by weight of photopolymerizable resin).

Example 2

A mixed monomer component was prepared by mixing 6% by weight of acrylic acid (AA), 25% by weight of methyl acrylate (MA), and 69% by weight of ethylhexyl acrylate (EHA). A photopolymerizable resin having a weight average molecular weight (Mw) of 8 million was prepared from the mixed monomer component through photopolymerization. 10 parts by weight of the photopolymerizable resin, 90 parts by weight of a photocurable monomer compared to 100 parts by weight of a photopolymerizable resin, 0.1 parts by weight of HDDA as a photocuring agent, 0.3 parts by weight of Irg651 as a photoinitiator, and glycidyl methacrylate as a crosslinkable monomer (glycidyl methacrylate, GMA) was prepared in a pressure-sensitive adhesive composition containing 0.1 parts by weight compared to 100 parts by weight of the photopolymerizable resin.

Example 3

A mixed monomer component was prepared by mixing 7% by weight of acrylic acid (AA), 25% by weight of methyl acrylate (MA), and 68% by weight of ethylhexyl acrylate (EHA). A photopolymerizable resin having a weight average molecular weight (Mw) of 8 million was prepared from the mixed monomer component through photopolymerization. 10 parts by weight of the photopolymerizable resin, 90 parts by weight of a photocurable monomer compared to 100 parts by weight of a photopolymerizable resin, 0.1 parts by weight of HDDA as a photocuring agent, 0.3 parts by weight of Irg651 as a photoinitiator, and glycidyl methacrylate as a crosslinkable monomer (glycidyl methacrylate, GMA) was prepared in a pressure-sensitive adhesive composition containing 0.1 parts by weight compared to 100 parts by weight of the photopolymerizable resin.

Example 4

A mixed monomer component was prepared by mixing 8% by weight of acrylic acid (AA), 25% by weight of methyl acrylate (MA), and 67% by weight of ethylhexyl acrylate (EHA). A photopolymerizable resin having a weight average molecular weight (Mw) of 8 million was prepared from the mixed monomer component through photopolymerization. 10 parts by weight of the photopolymerizable resin, 90 parts by weight of a photocurable monomer compared to 100 parts by weight of a photopolymerizable resin, 0.1 parts by weight of HDDA as a photocuring agent, 0.3 parts by weight of Irg651 as a photoinitiator, and glycidyl methacrylate as a crosslinkable monomer (glycidyl methacrylate, GMA) was prepared in a pressure-sensitive adhesive composition containing 0.1 parts by weight compared to 100 parts by weight of the photopolymerizable resin.

Example 5

A mixed monomer component was prepared by mixing 10% by weight of acrylic acid (AA), 25% by weight of methyl acrylate (MA), and 65% by weight of ethylhexyl acrylate (EHA). A photopolymerizable resin having a weight average molecular weight (Mw) of 8 million was prepared from the mixed monomer component through photopolymerization. 10 parts by weight of the photopolymerizable resin, 90 parts by weight of a photocurable monomer compared to 100 parts by weight of a photopolymerizable resin, 0.1 parts by weight of HDDA as a photocuring agent, 0.3 parts by weight of Irg651 as a photoinitiator, and glycidyl methacrylate as a crosslinkable monomer (glycidyl methacrylate, GMA) was prepared in a pressure-sensitive adhesive composition containing 0.1 parts by weight compared to 100 parts by weight of the photopolymerizable resin.

Example 6

Except for preparing a pressure-sensitive adhesive composition containing 0.1 parts by weight of 100 parts by weight of photopolymerizable resin, 1,2 epoxy-9-decene (1,2 Epoxy-9-decene) having m=1 in Chemical Formula 1 as a crosslinkable monomer, An adhesive composition was prepared in the same manner as in Example 2.

Example 7

Except for preparing a pressure-sensitive adhesive composition comprising 0.1 parts by weight of 100 parts by weight of photopolymerizable resin as 4-hydrobutyl acrylate glycidylether (4HBAGE) having m=2 in Chemical Formula 1 as a crosslinkable monomer. And, in the same manner as in Example 2, an adhesive composition was prepared.

Example 8

A pressure-sensitive adhesive composition was prepared in the same manner as in Example 2, except that a pressure-sensitive adhesive composition containing glycidyl methacrylate (GMA) as a crosslinkable monomer in an amount of 0.05 parts by weight compared to 100 parts by weight of the photopolymerizable resin was prepared. .

Example 9

A pressure-sensitive adhesive composition was prepared in the same manner as in Example 2, except that a pressure-sensitive adhesive composition containing glycidyl methacrylate (GMA) as a crosslinkable monomer in 0.2 parts by weight compared to 100 parts by weight of the photopolymerizable resin was prepared. .

Comparative example One

A pressure-sensitive adhesive composition was prepared in the same manner as in Example 2, except that a pressure-sensitive adhesive composition containing 0.3 parts by weight of 100 parts by weight of glycidyl methacrylate (GMA) as a crosslinkable monomer was prepared. .

Comparative example 2

A pressure-sensitive adhesive composition was prepared in the same manner as in Example 2, except that a pressure-sensitive adhesive composition containing glycidyl methacrylate (GMA) as a crosslinkable monomer in an amount of 0.5 parts by weight compared to 100 parts by weight of the photopolymerizable resin was prepared. .

Comparative example 3

A pressure-sensitive adhesive composition was prepared in the same manner as in Example 2, except that a pressure-sensitive adhesive composition containing glycidyl methacrylate (GMA) as a crosslinkable monomer in an amount of 1.0 part by weight compared to 100 parts by weight of the photopolymerizable resin was prepared. .

Comparative example 4

A pressure-sensitive adhesive composition was prepared in the same manner as in Example 2, except that a pressure-sensitive adhesive composition containing glycidyl methacrylate (GMA) as a crosslinkable monomer in an amount of 5.0 parts by weight compared to 100 parts by weight of the photopolymerizable resin was prepared. .

Comparative example 5

A pressure-sensitive adhesive composition was prepared in the same manner as in Example 2, except that a photopolymerization resin having a weight average molecular weight (Mw) of 2 million was prepared from the monomer composition through photopolymerization.

Mixed monomer component Photopolymerization resin
[Mw] Adhesive composition MA [% by weight] AA [% by weight] EHA [% by weight] Photopolymerization resin [% by weight] Crosslinkable monomer Kinds Content [parts by weight] Example 1 25 5 70 8 million 10 GMA 0.1 Example 2 25 6 69 8 million 10 GMA 0.1 Example 3 25 7 68 8 million 10 GMA 0.1 Example 4 25 8 67 8 million 10 GMA 0.1 Example 5 25 10 65 8 million 10 GMA 0.1 Example 6 25 6 69 8 million 10 m=1 0.1 Example 7 25 6 69 8 million 10 m=2 0.1 Example 8 25 6 69 8 million 10 GMA 0.05 Example 9 25 6 69 8 million 10 GMA 0.2 Comparative Example 1 25 6 69 8 million 10 GMA 0.3 Comparative Example 2 25 6 69 8 million 10 GMA 0.5 Comparative Example 3 25 6 69 8 million 10 GMA 1.0 Comparative Example 4 25 6 69 8 million 10 GMA 5.0 Comparative Example 5 25 6 69 2 million 10 GMA 0.1

<Evaluation>

The pressure-sensitive adhesive compositions of Examples 1-7 and Comparative Examples 1-5 were applied on both surfaces of a polyethylene terephthalate (PET) material substrate, and under a temperature condition of 30° C., UV irradiation of about 1,800 mJ/cm ² was applied. UV curing was performed to form a photocured product. Thus, an adhesive tape including an adhesive layer containing a photocured product was prepared. Specifically, the pressure-sensitive adhesive tape is a double-sided pressure-sensitive adhesive tape in which the pressure-sensitive adhesive layers on both sides of the substrate are formed to a thickness of 100 μm, respectively.

Experimental Example 1: Curing degree (gel content) (%)

With respect to the pressure-sensitive adhesive layer prepared from the pressure-sensitive adhesive composition of the Examples and Comparative Examples, the gel content [%] was measured by the following calculation formula 1.

<Calculation formula 1>

Curing degree (GEL, %) = (W ₂ / W ₁ ) × 100

In the above equation 1, the mass of the target hardened specimen to measure the degree of curing is measured to obtain the'first mass (W ₁ )'. The mass (dry mass) of the specimen obtained by immersing the specimen of the cured mass of the first mass in ethyl acetate solvent and standing at room temperature for 24 hours, after filtering using 200 mesh wire, and drying the remaining specimen at 110° C. for 2 hours The'gel content before aging' was measured as'later mass (W2)'. Then, after storing the specimen of the target cured product at 50°C for 1 day, the'gel content after aging' was measured, and the results are shown in Table 2 below.

Experimental Example 2: Repulsion resistance

Measurement method: For each adhesive tape prepared with the adhesive composition of Examples 1-9 and Comparative Examples 1-5, the time at which each adhesive layer was peeled from plates of different materials was measured by the method described below. It was evaluated as repulsion resistance.

Further, after storage and aging at a temperature of about 50° C. for 1 day, rebound resistance was measured again.

1) Prepare a first plate of size 155Ⅹ30Ⅹ0.5mm from aluminum material, prepare a second plate size of 170Ⅹ35Ⅹ2mm from polycarbonate material, and prepare them once with isopropyl acetate (IPA), as heptanes. Washed 3 times.

2) Each adhesive tape was cut to a size of 150 mm to 20 mm to prepare each specimen.

3) On the one side of the first plate, the vertical edges are aligned with each other to position the specimen, and then pressed and pressed twice with a 7kg roller, and then the vertical edges are aligned with each other on one side of the specimen. After the second plate was positioned, it was reciprocated and pressed twice with a 7 kg roller to form a laminate specimen having a stacked structure of the second plate/the specimen/the first plate.

c) After aging the laminate specimen for 30 minutes at 60° C., a direction in which the horizontal (170 mm) of the second plate and the vertical (165 mm) of the test jig are parallel to a test jig made of aluminum having a size of 210Ⅹ165Ⅹ5mm. With both ends fitted, the laminate specimens were bent accordingly.

Accordingly, one of the both ends includes each layer (the second plate/the specimen/the first plate) of the laminate specimen, and the other is such that only the second plate is included.

d) The laminated specimen in the bent state was placed in a high-temperature and high-humidity chamber at 85°C/85% condition and left for 2 hours, and at the end side including only the second plate, the laminated specimen on the second plate was 10. Observing at minute intervals, the time taken for at least one of the specimen; and the first plate and the second plate to be peeled was measured, and the results are shown in Table 2 below.

Experimental Example 3: Measurement of high temperature adhesion

In the adhesive tapes of Examples 1-9 and Comparative Examples 1-5, each adhesive layer was attached to a polycarbonate (PC) substrate, and then under a temperature of about 60° C. and a relative humidity of about 80% for 1 hour. For a while. Subsequently, the peel strength was measured at a rate of 300 mm/min to measure the adhesion [g/in ² ]. In addition, after storage and aging at a temperature of about 50° C. for 1 day, the adhesive force was measured again, and the results are shown in Table 2 below.

Experimental Example 4: adhesion Retention Measure

For each pressure-sensitive adhesive tape made of the pressure-sensitive adhesive composition of the Examples and Comparative Examples, two 60 mm × 25 mm rectangular SUS substrates are prepared, and then specimens corresponding to 1 inch*1 inch are attached to both sides. After leaving for 2 hours, it was placed in a high-temperature/high-humidity chamber at 85°C/85%, and the time to drop off was measured. The results are as shown in Table 2 below.

Gel content [%] Repulsion resistance (time) High temperature adhesion (g/in) Adhesion holding power Before aging After aging Before aging After aging Before aging After aging Example 1 37 38 24 24 3400 3500 One Example 2 42 42 24 24 2800 3000 24 Example 3 45 48 6 6 2400 2800 24 Example 4 48 50 4 4 2200 2500 24 Example 5 53 56 One One 2000 2000 24 Example 6 40 42 24 24 2600 3000 12 Example 7 40 42 24 24 3000 3200 6 Example 8 50 50 24 24 2600 2600 24 Example 9 50 60 24 24 2600 2600 24 Comparative Example 1 50 83 24 4 2600 2000 24 Comparative Example 2 50 85 24 2 2600 1800 24 Comparative Example 3 50 90 24 One 2600 1500 24 Comparative Example 4 58 94 24 0.5 3000 1100 24 Comparative Example 5 48 49 2 4 2800 3600 4

When referring to the results in Table 2, the adhesive tapes prepared from Examples 1 to 9 containing 0 to 0.2 or less parts by weight of glycidyl methacrylate (GMA) compared to 100 parts by weight of the photopolymerizable resin as a crosslinkable monomer are 0.2 It can be seen that the excellent adhesion and retention properties of the adhesive tapes prepared from Comparative Examples 1 to 4 containing excess weight parts of GMA are maintained at a constant level even after aging. That is, the adhesive tape prepared from the example has little change over time, and thus, it can be confirmed that it has stable physical properties.

100: adhesive tape
10: heartwood
20: adhesive layer

Claims (18)

It is formed from a mixed monomer component comprising a first alkyl (meth)acrylate having an alkyl group having 4 to 15 carbon atoms, a second alkyl (meth)acrylate having an alkyl group having 1 to 3 carbon atoms, and acrylic acid, and has a weight average molecular weight (Mw ) Is 5 to 10 million photopolymerizable resin; And a crosslinkable monomer,
The content of the crosslinkable monomer is more than 0 and 0.2 parts by weight or less compared to 100 parts by weight of the photopolymerizable resin,
8 to 12% by weight of the photopolymerizable resin
Adhesive composition.
According to claim 1,
The crosslinkable monomer contains a glycidyl group-containing (meth)acrylate
Adhesive composition.
According to claim 2,
The glycidyl group-containing (meth)acrylate has the structure of Formula 1
Adhesive composition.
[Formula 1]

(R ₁ is hydrogen or a methyl group, m is an integer from 0 to 10)
According to claim 1,
The crosslinkable monomer has a crosslinking reactivity at 60°C to 90°C and a relative humidity of 50% to 90%.
Adhesive composition.
According to claim 1,
The mixed monomer component comprises 20% to 40% by weight of the second alkyl (meth)acrylate
Adhesive composition.
According to claim 1,
The mixed monomer component contains 6% to 8% by weight of the acrylic acid
Adhesive composition.
According to claim 1,
The first alkyl (meth) acrylate comprises one selected from the group consisting of ethyl hexyl (meth) acrylate, butyl (meth) acrylate, isooctyl (meth) acrylate, and combinations thereof
Adhesive composition.
The method of claim 1
The second alkyl (meth) acrylate comprises one selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, and combinations thereof
Adhesive composition.
delete According to claim 1,
Photocurable monomer, photocuring agent, photoinitiator, and further comprising one selected from the group consisting of combinations thereof
Adhesive composition.
The method of claim 10,
The photocurable monomer includes one selected from the group consisting of alkyl (meth)acrylate, hydroxyl group-containing (meth)acrylate, carboxyl group-containing (meth)acrylate, and combinations thereof.
Adhesive composition.
The method of claim 10,
The photocuring agent is 2,4-trilene diisocyanate, 2,6-triene diisocyanate, hydrogenated trilene diisocyanate, 1,3-xylene diisocyanate, 1,4-xylene diisocyanate, diphenyl methane-4, 4-diisocyanate, 1,3-bisisocyanatomethyl cyclohexane, tetra methyl xylene diisocyanate, 1,5-naphthalene diisocyanate, 2,2,4-trimethyl hexamethylene diisocyanate, 2,4,4-trimethyl hexa One selected from the group consisting of methylene diisocyanate, trimethylene diisocyanate adduct of trimethyrolpropane, xylene diisocyanate adduct of trimethyrolpropane, toriphenylmethanetoriisocyanato, methylene bis triisocyanate, and combinations thereof. Containing
Adhesive composition.
The method of claim 10,
The photoinitiator is an alpha-ketone-based compound, acetophenone-based compound, ketal-based compound, aromatic sulfonyl chloride-based compound, photoactive oxime-based compound, benzophenone-based compound, thioxanthone-based compound, campoquinone-based compound, halogenated ketone-based compound , Acyl phosphoxide-based compound, acyl phosphonate-based compound and one selected from the group consisting of a combination thereof
Adhesive composition.
According to claim 1,
The pressure-sensitive adhesive composition is applied to the bezel portion of the display, and the bezel portion has a width of 2 mm to 5 mm.
Adhesive composition.
An adhesive tape having an adhesive layer comprising a photocured product of the adhesive composition according to any one of claims 1 to 8 or 10 to 14.
The method of claim 15,
The photocured product is formed by photocuring the pressure-sensitive adhesive composition at room temperature.
Adhesive tape.
The method of claim 15,
The photocured product comprises a crosslinkable monomer containing a glycidyl group-containing (meth)acrylate
Adhesive tape.
The method of claim 15,
The gel content of the adhesive layer is 40% to 60%
Adhesive tape.

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