KR20230067334A - UV Curable Adhesive and Heterogeneous Bonding Sheet Containing Same - Google Patents

Abstract

The present invention relates to a UV-curable adhesive and a heterogeneous bonding sheet containing the same, wherein the UV-curable adhesive has improved transparency and an enhanced curating rate of the inside and the surface of the adhesive due to inhibition of foaming and alleviation of a yellowing phenomenon and the heterogeneous bonding sheet has enhanced durability, a lowered shrinkage rate, and a reduction in foaming, thereby enhancing optical properties such as transparency, haze, and the like and bonding strength and impact strength. The UV-curable adhesive according to one embodiment of the present invention comprises a urethane acrylate oligomer, an acrylate monomer, a photoinitiator, and an additive, wherein the photoinitiator is obtained by mixing a short-wavelength photoinitiator and a long-wavelength photoinitiator for use and the additive is at least any one selected from a group consisting of UV organic and inorganic reactive compounds, infrared blocking ingredients, and UV absorbing ingredients.

Description

UV Curable Adhesive and Heterogeneous Bonding Sheet Containing Same}

The disclosed content relates to a UV curable adhesive and a heterojunction sheet including the same.

Unless otherwise indicated herein, material described in this section is not prior art to the claims in this application, and it is not admitted that the material described in this section is prior art.

Heterogeneous bonding sheet is a sheet made for the purpose of supplementing the yellowing of the resin layer or the easily breakable physical properties and high specific gravity of glass by inserting an adhesive layer with strong adhesive strength between resin and resin, resin and glass, and glass. It has excellent shock absorption, so it is not easily damaged, and even if the sheet is damaged due to an external impact, the film catches the glass fragments and prevents them from scattering, thereby preventing further damage.

These heterojunction sheets are used for windshields of automobiles, financial facilities that require crime prevention performance, and high-rise building exterior windows, balconies, skylights, and shower booths to reduce damage due to glass breakage with a large floating population. Countries such as China are gradually raising standards for safety glass and expanding the application of heterojunction sheets to more places.

In general, in the manufacture of a heterojunction sheet, a polyvinyl butyral (PVB) film or an ethylene vinyl acetate (EVA) film is inserted as an intermediate film between glasses, and after preheating, the film and glass are brought into close contact with each other through a roll-press process, followed by autoclaving. It is produced by removing internal bubbles generated in the process after going through a manufacturing process of high temperature and high pressure for a long time using an autoclave. However, in the case of PVB film, although it occupies most of the laminated glass material for construction, it has a disadvantage that whitening and peeling from the glass layer may occur because of its low water resistance. EVA film is inexpensive and has excellent water resistance, but has poor strength and light resistance.

Recently, in order to improve this, a heterojunction sheet that bonds between resins or glass with a photocurable resin is being developed. When a photocurable resin is used, the physical properties of the heterojunction sheet can be adjusted according to the characteristics of the final product and cured in a short time. It has the advantage of shortening the manufacturing period compared to the existing film bonding process. Photocurable resins have a very fast curing time compared to thermosetting resins, so the process time can be shortened, and as they are rapidly cured at low temperatures, energy consumption for the curing process is reduced. Also, since the resin itself does not contain a solvent, it is volatile during the process. It has the advantage of not emitting organic compounds (VOCs) and has recently attracted attention in many industrial fields.

However, in this case, bubbles are easily generated during the bonding process, and the bubbles generated in this way hinder the light transmittance of the heterojunction sheet, thereby reducing its performance. In addition, when a general UV-curable resin is exposed to UV for a long time, it causes a yellowing phenomenon in which the color changes to yellow, and this yellowing phenomenon not only interferes with the light transmittance of the heterojunction sheet, but also has a problem of impairing its appearance.

Patent Document 1: Korean Patent Registration No. 10-1000131 Patent Document 2: Republic of Korea Patent Registration No. 10-0545629

The disclosed invention is to provide a UV curable adhesive capable of improving transparency and increasing the curing rate of the inside and surface of the adhesive through suppression of blistering and improvement of yellowing.

In addition, the disclosed invention is to provide a heterojunction sheet containing a UV curable adhesive capable of improving durability, shrinkage rate and bubble generation, thereby improving optical properties such as transparency and haze, adhesive strength and impact strength. .

In addition, it is not limited to the technical problems as described above, and it is obvious that other technical problems may be derived from the following description.

Disclosed are urethane acrylate oligomers; acrylate monomer; photoinitiators; And an additive, wherein the photoinitiator is a combination of a short-wavelength photoinitiator and a long-wavelength photoinitiator, and the additive is a UV curable adhesive that is at least one selected from the group consisting of a UV-reactive compound, an infrared ray blocking component, and a UV absorbing component. Initiate.

According to the characteristics of the disclosure, based on the total 100 parts by weight of the UV curable adhesive, 10 to 50 parts by weight of the urethane acrylate oligomer, 50 to 80 parts by weight of the acrylate monomer, and 0.1 to 5 parts by weight of the photoinitiator It may be included there is.

In addition, the average molecular weight of the urethane acrylate oligomer may be 1000 to 3000 g / mol.

In addition, the UV-reactive organic-inorganic particles may have the following Structural Formula (1).

와 같은 망상구조를 나타내며, 상기 R은 C2 ~ C20의 지방족 또는 지환족 알킬기, 방향족 구조의 화합물을 나타내며, Acryl은 아크릴 화합물이다. )(In [Structural Formula 1] above, the silica particles are

Represents a network structure such as, wherein R represents a C2 ~ C20 aliphatic or alicyclic alkyl group, an aromatic compound, and Acryl is an acrylic compound. )

Also disclosed is an adhesive layer comprising the UV curable adhesive; And a heterojunction sheet comprising a UV curable adhesive including a substrate layer formed on both sides of the adhesive layer is disclosed as another embodiment.

According to the characteristics of the disclosed contents, the base layer is characterized in that any one selected from the group consisting of polymethyl methacrylate, polycarbonate, acrylonitrile butadiene styrene copolymer or tempered glass.

In addition, the base layer may be formed of two to four layers, and the adhesive layer may be formed between the plurality of base layers, respectively.

In addition, the heterojunction sheet containing the UV curable adhesive may be characterized in that it is used for crime prevention or bulletproof sheet purposes.

According to the UV curable adhesive according to an embodiment of the disclosed subject matter, there is an advantage in that transparency is improved through suppression of bubble generation and improvement of yellowing phenomenon.

In addition, according to the heterojunction sheet containing a UV curable adhesive according to an embodiment of the present disclosure, durability is improved and shrinkage rate and bubble generation are lowered, thereby improving optical properties such as transparency and haze, adhesive strength, and impact strength. It has the potential to improve.

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

1. UV curable adhesive

UV curable adhesives disclosed herein include urethane acrylate oligomers; acrylate monomer; photoinitiators; And an additive, wherein the photoinitiator is a combination of a short-wavelength photoinitiator and a long-wavelength photoinitiator, and the additive is at least one selected from the group consisting of a UV-reactive compound, an infrared blocking component, and a UV-absorbing component. Corresponds to a UV curable adhesive. The UV-curable adhesive has the characteristics of improving transparency and increasing the curing rate of the inside and surface of the adhesive by inhibiting blistering and improving yellowing. Hereinafter, configurations included in the UV curable adhesive will be described in more detail.

(1) Urethane Acrylate Oligomer

Among the types of acrylate oligomers, urethane acrylate oligomers correspond to acrylates having excellent curability, abrasion resistance and flexibility, and thus correspond to oligomers suitable for use in UV curable adhesives.

The average molecular weight of the urethane acrylate oligomer is not particularly limited, but is preferably 1,000 to 3,000 g/mol. When the average molecular weight is less than 1,000 g / mol, a problem of lowering the hardness improvement effect by bonding may occur, and when the average molecular weight exceeds 3,000 g / mol, workability may be deteriorated due to excessively high viscosity.

The urethane acrylate oligomer may be produced by polymerizing polyurethane and acrylic monomers synthesized by polymerizing isocyanate and polyol, but is not limited thereto.

The isocyanate can be used without limitation in its kind, such as aliphatic isocyanate and aromatic isocyanate. The aliphatic isocyanates include isophorone diisocyanate (IPDI), 1,6-hexamethylene diisocyanate (HDI), 4,4-dicyclohexylmethane diisocyanate (4,4-dicyclohexylmethanediisocyanate; H12MDI ), 3-isocyanatomethyl-3,5,5-tricyclohexyl isocyanate (IPDI), 1,4-cyclohexyl diisocyanate (1,4-cyclohexyl diisocyanate; CHDI) and 2,2,4-trimethylhexamethylene diisocyanate (2,2,4-trimethylhexamethylene diisocyanate; TMDI) may be used. As the aromatic isocyanate, tolylene diisocyanate, xylylene diisocyanate, Methylenediphenyl diisocyanate, phenylene diisocyanate, naphthalene diisocyanate and the like can be used.

The type of the polyol is not particularly limited as long as it is generally used in the technical field of the present invention, but monomolecular diols may be more preferably used as the polyol. For example, ethylene glycol, propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, 1,4-cyclohexane dimethanol, bisphenol A, bisphenol F, reduced bisphenol A, reduced bisphenol F, dicyclopentadiol, tricyclodecanediol, and one or more monomolecular diols selected from the group consisting of mixtures thereof may be used. In addition, polyols of these monomolecular diols include polyester glycol, polyether glycol, polycarbonate glycol, polyethylene glycol, polypropylene glycol, amine-terminated polyether, polytrimethylene ether glycol, polytrimethylene ether ester glycol, poly It may be used in combination with at least one polyol selected from the group consisting of trimethylene-co-ethylene ether glycol, polytetramethylene ether glycol, and mixtures thereof.

The acrylic monomer is not limited in its kind, but specifically, 2-hydroxyethyl methacrylate (HEMA), 2- (2-hydroxyethoxy) ethyl methacrylate (2- (2 -hydroxyethoxyethyl methacrylate), Dodecyl methacrylate, 2-Ethylhexyl acrylate, 2-EHA, Tetradecyl methacrylate, Hydroxyethyl acrylate ( Hydroxyethyl acrylate (HEA), Glycidyl methacrylate (GMA), Isoborneol acrylate (IBOA), Acrylic acid (AA), Methyl methacrylate (MMA), At least one selected from the group consisting of cyclohexyl methacrylate (CHMA) may be used.

The urethane acrylate oligomer is preferably included in an amount of 10 to 50 parts by weight based on 100 parts by weight of the total UV curable adhesive. When included in less than 10 parts by weight, it is difficult to control the coating thickness due to low viscosity, and when included in more than 50 parts by weight, the viscosity is too high and the initial adhesive strength is low.

(2) Acrylate monomer

The acrylate monomer is a composition added as a reactive diluent for the purpose of improving workability by reducing the viscosity of an oligomer or increasing adhesion to a glass or polycarbonate sheet. It is also a material that also becomes part of the UV curable adhesive composition by crosslinking.

Depending on the type of substituent, an alkyl acrylate monomer, a hydroxy group-containing acrylate monomer, a glycidyl group-containing acrylate monomer, or a nitrogen-containing acrylate monomer may be selected. The type of alkyl acrylate monomer is not limited, but methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth ) Acrylate, lauryl acrylate, isodecyl acrylate, etc., and the type of acrylate monomer containing a hydroxyl group is not limited, but hydroxy (meth) acrylate, hydroxy (meth) methyl acrylate, Tetrahydrofurfuryl acrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, 2-hydroxy-3-phenoxypropyl acrylate, etc. Acrylate monomers containing a dil group include, but are not limited to, glycidyl (meth)acrylate, etc., and acrylate monomers containing a nitrogen component include, but are not limited to, acrylamide or acrylonitrile, etc. there is

In addition, monofunctional acrylate monomers have high flexibility and can suppress yellowing to improve transparency, and multifunctional acrylate monomers exhibit high modulus of elasticity due to enhancement of crosslinking density, so it is possible to appropriately select an acrylate monomer suitable for the purpose. there is. The monofunctional acrylate monomer is not limited in its kind, but 2-ethylhexyl (meth)acrylate, N,N-dimethyl (meth)acrylate, N-vinylcaprolactam, N-vinylpyrrolidone, t-butyl (meth)acrylate, t-octyl (meth)acrylate, nonyl (meth)acrylate, dodecyl (meth)acrylate, dimethylaminoethyl (meth)acrylate, dicyclopentanyl (meth)acrylate, dicyclo Pentadiene (meth) acrylate, diacetone (meth) acrylamide, diethylaminoethyl (meth) acrylate, lauryl (meth) acrylate, methoxyethylene glycol (meth) acrylate, methoxy polyethylene glycol (meth) )acryl

rate, methoxypolypropylene glycol (meth)acrylate, methyl (meth)acrylate, benzyl (meth)acrylate, bornyl (meth)acrylate, butoxyethyl (meth)acrylate, butyl (meth)acrylate, Cyclohexyl (meth)acrylate, steeryl (meth)acrylate, ethoxyethoxyethyl (meth)acrylate, ethyl (meth)acrylate, epoxydiethylene glycol (meth)acrylate, octadecyl (meth)acrylate Acrylate, isodecyl (meth)acrylate, isobornyl (meth)acrylate, isobutoxy (meth)acrylamide, isobutyl (meth)acrylate, isoamyl (meth)acrylate, isopropyl (meth)acrylate , tetrahydrofurfuryl (meth)acrylate, tricyclodecanyl (meth)acrylate, phenoxyethyl (meth)acrylate, polyethylene glycol mono (meth)acrylate, polypropylene glycol mono (meth)acrylate, propyl At least one selected from the group consisting of (meth)acrylate and hydroxyethyl (meth)acrylate is preferred, and the multifunctional monomer is not limited in its kind, but 1,6-hexanediol di(meth)acrylate, Ethylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, trimethylolpropane trioxyethyl(meth)acrylate, tricyclodecane dimethanol diacrylate, tripropylene glycol diacrylate, pentaeryth Any one or more selected from the group consisting of ritol tri (meth) acrylate is preferred.

The acrylate monomer is preferably included in an amount of 50 to 80 parts by weight based on 100 parts by weight of the total UV curable adhesive. If it is included in less than 50 parts by weight, it becomes difficult to apply and coat the adhesive due to reduced flowability, and if it is included in more than 80 parts by weight, the viscosity of the adhesive is low, resulting in uneven coating thickness and long curing time. do.

(3) Photoinitiator

A photoinitiator means a material added to a UV curable adhesive to absorb energy from a UV lamp to start a polymerization reaction.

As the photoinitiator, any photoinitiator capable of initiating a polymerization reaction by generating radicals by light irradiation may be used without any particular limitation. Preferably, any one or more selected from benzoin-based, hydroxyketone-based, amino-ketone-based, and phosphine oxide-based compounds may be used, but is not necessarily limited thereto. Specifically, 2,2-dimethoxy-2-phenyl-acetophenone, xanthone, 1-hydroxycyclohexylphenyl

Ketone, benzaldehyde, anthraquinone, 3-methylacetophenone, 1-(4-isopropyl-phenol)-2-hydroxy-2-methyl propan-1-one, thioxanthone, 4-chlorobenzophenone, 4, At least one selected from the group consisting of 4'-dimethoxybenzophenone, 4,4'-diaminobenzophenone, benzoin propyl ether, benzoin ethyl ether, and mixtures thereof may be used, and commercial photoinitiators include Ciba Irgacure 127, 184, 250, 369, 379, 651, 500, 754, 784, 819, 819DW, 907, 1300, 1700, 1800, 20 from Geigy (Klybecstrasse 141, Basle, Baslestadt, 4002, Switzerland) 22, 2100; 2959, etc. One of these may be used alone, but two or more may be mixed and used.

Depending on the absorption rate according to the UV light wavelength, it is possible to use a short wavelength absorption photoinitiator (for surface curing) and a long wavelength absorption photoinitiator (for deep curing), respectively. Since the curing rate of the inside and the surface can be increased, it is preferable to use both photoinitiators in combination. Photoinitiators for surface curing include IC-184 (1-Hydroxy-cyclohexyl phenyl ketone), DC-1173 (2-Hydroxy-2-methyl-1-phenyl-1-propanone) and IC-2959, and photoinitiators for deep curing DC-TPO (Diphenyl(2,46-trimethylbenzoyl)-phosphine oxide), IC-819 (phosphine oxide, pheny bis(2,4,6-trimethyl benzoyl)), IC2100 (phosphine oxide) and IC-2022 (IC -819+DC1173) and so on.

The photoinitiator is preferably included in an amount of 0.1 to 5 parts by weight based on 100 parts by weight of the total UV curable adhesive. When it is included in less than 0.1 parts by weight, the polymerization rate is slow and the conversion rate is low, and when it is included in more than 5 parts by weight, the reaction rate is fast, but there are many low molecular weight oligomers, and the physical properties of the adhesive are deteriorated.

(4) Additives

The UV curable adhesive according to the present invention may further include an additive within a range in which the effect to be achieved is not deteriorated in order to provide an additional purpose.

The UV-curable adhesive according to the present invention is a compound represented by [Structural Formula 1] below, and is a compound in which an acrylic group is bonded to nano-sized silica particles to enable UV curing.

[구조식 1]

[Structural Formula 1]

와 같은 망상구조를 나타내며, 상기 R은 합성에 사용되는 화합물의 구조에 따라 달라질 수 있으나, 바람직하게는 C2 ~ C20의 지방족 또는 지환족 알킬기, 방향족 구조의 화합물을 나타내며, Acryl은 아크릴 화합물을 나타낸다. In [Structural Formula 1] above, the silica particles are

Represents a network structure such as, The R may vary depending on the structure of the compound used in the synthesis, but preferably represents a C2 ~ C20 aliphatic or alicyclic alkyl group, an aromatic compound, and Acryl represents an acrylic compound.

The nano-sized UV-reactive organic/inorganic compound is introduced, and upon UV irradiation, the reactive inorganic particles are cured together with the urethane acrylate oligomer and the acrylate monomer, and are uniformly distributed in the cured polymer adhesive layer structure, resulting in durability as a structural feature. is improved and shrinkage and blistering are lowered, resulting in transparent

It has an effect of improving optical properties such as degree, haze, adhesive strength, and impact strength.

The UV curable adhesive according to the present invention may further include an infrared ray blocking material in order to impart an infrared ray blocking function to the heterojunction sheet bonded thereto. As the infrared blocking material, any material for blocking infrared rays can be used without limitation, and specifically, a single metal selected from titanium, zinc, indium, tin, antimony, molybdenum, tantalum, tungsten, vanadium, niobium, etc. It may be a metal oxide containing or a metal composite oxide containing a plurality of metals.

The UV curable adhesive according to the present invention may further include an ultraviolet ray absorbing material in order to impart an ultraviolet ray blocking function to the heterojunction sheet bonded thereto. As the UV absorbing material, 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-5-chlorobenzotyriazole, alkoxybenzophenone, and the like may be used.

The oil gelling agent can adjust the viscosity of the UV curable adhesive composition and has an effect of being easy to apply even to a substrate layer having a curved surface. As the oil gelling agent, it is preferable to use an aliphatic amide such as hydroxy fatty acid or hydroxy fatty acid amide in terms of transparency.

Thermal polymerization inhibitor This is to prevent gelation due to the reaction proceeding during storage due to the generation of radicals by heat. does not exist.

A wetting agent is a material added to improve the spreadability by reducing the surface tension of the adhesive when the surface tension is low on the adhered surface, and there is no limitation in the type as long as it can be used by those skilled in the art.

The antifoaming agent is added to remove air bubbles generated by vortexes that may occur during the process of applying the adhesive, and modified silicone acrylate or the like may be used, but the type is not limited as long as it is available to those skilled in the art.

The plasticizer improves the plastic processability of the pressure-sensitive adhesive composition and imparts flexibility to the adhesive layer formed by the UV curable adhesive composition. Plasticizers include, but are not limited to, phthalate-based plasticizers, trimellitic acid ester-based plasticizers, phosphate-based plasticizers, epoxy-based plasticizers, polyester-based plasticizers, aliphatic stress-based plasticizers, and chlorinated paraffinic plasticizers.

As an antioxidant, (Tris(2,4-di-tert-butylphenyl) phosphite, Irgafos 168) may be used, but is not limited thereto.

Additionally, ε-caprolactone can be added, which is commonly used as a resin additive because it is easy to manufacture, mix, and mix, and has properties such as processing characteristics, durability, flexibility, compression set, and tear strength can strengthen

In addition, additives may include one or more additives selected from the group consisting of fillers, impact modifiers, polymer compounds, dispersants, adhesion promoters, antistatic agents, flame retardants, lubricants, flame retardants, lubricants, and impact modifiers, but are not limited thereto.

The content of the additive may vary depending on the function and purpose to be imparted.

2. Heterogeneous bonding sheet containing UV curable adhesive

A heterojunction sheet comprising a UV curable adhesive disclosed herein includes an adhesive layer comprising the UV curable adhesive described in detail above; And a UV curable adhesive comprising a base layer formed on both sides of the adhesive layer. The heterojunction sheet (hereinafter referred to as heterojunction sheet) containing the UV-curable adhesive has improved durability, reduced shrinkage and reduced bubble generation, and thereby improved optical properties such as transparency and haze, as well as adhesive strength and impact strength. There is a feature that

There is no limitation on the use of the heterojunction sheet, but it is preferably used for crime prevention or bulletproof sheets. Hereinafter, the configuration of the heterojunction sheet will be described in more detail.

(1) adhesive layer

The adhesive layer serves to adhere between substrate layers and is formed to a thickness of 0.5 to 6 millimeters. In addition, since it contains the above-described UV curable adhesive composition, transparency is improved through suppression of blistering and improvement of yellowing, and the curing rate of the inside and surface of the adhesive is high. When a UV curable adhesive in liquid form is injected between the substrate layers and cured with a UV curing machine, it is cured into a solid form and serves to adhere the substrate layers.

(2) base layer

The substrate layer is a layer constituting the substrate of the heterojunction sheet, and the type of the substrate layer is not limited, but is selected from polymethyl methacrylate (PMMA), polycarbonate (PC), acrylonitrile butadiene styrene copolymer, or tempered glass. it is desirable to be

The substrate layer is preferably laminated in two to five layers, and the adhesive layer may be formed between the plurality of substrate layers, respectively.

The thickness of the base layer may vary depending on the number of laminated base layers, and is preferably 1 to 20 millimeters. If the thickness is less than 1 millimeter, the durability of the heterojunction sheet is reduced, and if it exceeds 20 millimeters, it becomes too thick and fragments may be easily formed in the substrate layer when an external force is applied.

Although the preferred embodiments of the present invention have been described above, the configuration described in this specification is only one of the most preferred embodiments of the present invention and does not represent all of the technical ideas of the present invention, so they can be substituted at the time of this application. It should be understood that there may be many equivalents and variations. Therefore, the embodiments described above should be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the claims to be described later rather than the detailed description, and the meaning and scope of the claims and their All changes or modified forms derived from equivalent concepts should be construed as being included in the scope of the present invention.

Claims (8)

urethane acrylate oligomers;
acrylate monomer;
photoinitiators; and
contains additives,
The photoinitiator is used by combining a short-wavelength photoinitiator and a long-wavelength photoinitiator,
The additive is at least one UV curable adhesive selected from the group consisting of a UV-reactive organic-inorganic compound, an infrared ray blocking component, and a UV absorbing component.
According to claim 1,
Based on the total 100 parts by weight of the UV curable adhesive, 10 to 50 parts by weight of the urethane acrylate oligomer, 50 to 80 parts by weight of the acrylate monomer and 0.1 to 5 parts by weight of the photoinitiator UV curable adhesive.
According to claim 1,
The average molecular weight of the urethane acrylate oligomer is 1000 to 3000g / mol UV curable adhesive.
According to claim 1,
The ultraviolet-reactive organic-inorganic particles are UV curable adhesives of the following structural formula (1).

[Structural formula (1)]
(In [Structural Formula 1] above, the silica particles are

Represents a network structure such as, wherein R represents a C2 ~ C20 aliphatic or alicyclic alkyl group, an aromatic compound, and Acryl is an acrylic compound. )
An adhesive layer comprising the UV curable adhesive of any one of claims 1 to 4; and
A heterojunction sheet comprising a UV curable adhesive comprising a substrate layer formed on both sides of the adhesive layer.
According to claim 5,
The base layer is a heterojunction sheet comprising a UV curable adhesive, characterized in that any one selected from the group consisting of polymethyl methacrylate, polycarbonate, acrylonitrile butadiene styrene copolymer or tempered glass.
According to claim 5,
The heterojunction sheet comprising a UV curable adhesive, characterized in that the base layer is formed of 2 to 5 layers, and the adhesive layer is formed between the plurality of base layers, respectively.
According to claim 5,
The heterojunction sheet containing the UV curable adhesive is a heterojunction sheet containing a UV curable adhesive, characterized in that used for crime prevention or bulletproof sheet.