JP2019143072A - Photocurable composition and liquid crystal display device using the same - Google Patents

Abstract

To provide a photocurable composition excellent in reactivity and a liquid crystal display device using the same.SOLUTION: The photocurable composition contains (A) an epoxy compound having two or more epoxy groups in one molecule and having an aromatic structure and/or an alicyclic structure, (B) an aromatic monofunctional epoxy compound having one epoxy group in one molecule, (C) an acyclic aliphatic bifunctional epoxy compound having two or more epoxy groups in one molecule, (D) a photobase generator, and (E) a compound having a thiol group. The ratio ((A)):((B)+(C)) of the mass of the epoxy compound (A) to the total mass of the aromatic monofunctional epoxy compound (B) and the acyclic aliphatic bifunctional epoxy compound (C) is within the range of 80:20 to 40:60.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a photocurable composition having excellent reactivity and a liquid crystal display device using the same.

  As photocurable compositions, radical photopolymerization materials using radical species generated by the action of light as initiators have been widely developed in order to improve the photocuring rate of monomers, oligomers or polymers. In addition, a cationic polymerization material using a photoacid generator to generate an acid by the action of light and using this acid as a catalyst has been actively studied. However, in the case of radical photopolymerization materials, since the polymerization reaction is inhibited by the oxygen in the air and the curing reaction is suppressed, a special device for blocking oxygen is required. In addition, in the case of a cationic polymerization material, there is no oxygen inhibition like a radical photopolymerization material, but the strong acid generated from the photoacid generator remains after curing, which causes the presence of the strong acid. The possibility of corrosion and yellowing of the resin is a problem.

  Against this background, as a new reaction system that has no inhibition of polymerization reaction due to oxygen, corrosion and yellowing due to acid, and excellent reactivity, a base is generated by the action of light, and this base is used as a catalyst. Anionic polymerization materials that attract attention are attracting attention.

  For example, the curable composition described in Patent Document 1 includes an epoxy resin, a photobase generator, and a thiol compound. After such a curable composition is irradiated with light, a cured product is produced by heating. FIG. 3 is a schematic view showing an example of a cured product 9 obtained by applying the photocurable composition of Patent Document 1 on the glass with ITO 10 and curing it.

JP 2017-88825 A

However, the curable composition described in Patent Document 1 attempts to knead a powdery photobase generator and a sensitizer added as necessary without using a diluent such as a solvent. However, the photobase generator or the like is not sufficiently dissolved in the epoxy resin and the thiol compound. For this reason, the curable composition of patent document 1 cannot be hardened as a thick film (for example, 500 micrometers or more). For example, in the curable composition shown as Example 1 in Patent Document 1, only a cured product having a film thickness of several tens of μm is formed, and Patent Document 1 specifically describes a cured product having a thick film. Is not disclosed.
Therefore, in the curable composition shown by patent document 1, when it exceeds the film thickness disclosed in the Example, it is estimated that the reactivity is inadequate.

  The present invention has been made to solve the conventional problems, and an object thereof is to provide a photocurable composition having excellent reactivity and a liquid crystal display device using the same.

In order to solve the above problems, the photocurable composition of the present invention is:
(A) an epoxy compound having two or more epoxy groups in one molecule and having an aromatic structure and / or an alicyclic structure;
(B) an aromatic monofunctional epoxy compound having one epoxy group in one molecule;
(C) an acyclic aliphatic bifunctional epoxy compound having two epoxy groups in one molecule;
(D) a photobase generator;
(E) a compound having a thiol group,
The ratio of the mass of the (A) epoxy compound to the total mass of the (B) aromatic monofunctional epoxy compound and the (C) acyclic aliphatic bifunctional epoxy compound is:
((A)): ((B) + (C)) = within a range of 80:20 to 40:60.

  In the composition of one embodiment of the present invention, the (C) acyclic aliphatic bifunctional epoxy compound is selected from the group consisting of compounds having any one of ethylene glycol, propylene glycol, and tetramethylene glycol in the mother skeleton. May be included.

  In the composition of one embodiment of the present invention, the photobase generator (D) includes a carboxylate having any of a xanthone skeleton and a ketoprofen skeleton, a salt containing a borate anion, a quaternary ammonium salt, and a carbamate compound. It may include at least one selected from the group consisting of:

  In the composition of one embodiment of the present invention, the compound (E) having a thiol group may be a compound not containing a compound having a dipropion group and thioglycolic acid as a mother skeleton in the molecule.

  The composition of one embodiment of the present invention may further comprise (F) an elastomer.

  According to one embodiment of the present invention, a liquid crystal device using the above composition is provided.

  According to the present invention, a photocurable composition having excellent reactivity can be provided. Furthermore, the liquid crystal display device using the photocurable composition according to the present invention can have high visibility.

FIG. 1 is a schematic cross-sectional view of a test piece for evaluating the reactivity and transparency of a photocurable composition according to an embodiment of the present invention. FIG. 2 is a schematic perspective view of a liquid crystal display device according to an embodiment of the present invention. FIG. 3 is a schematic cross-sectional view showing a cured product formed from a conventional photocurable composition.

FIG. 1 is a schematic cross-sectional view of a test piece 2 for evaluating reactivity and transparency. The test piece 2 includes a cured product 1 of a photocurable composition and a glass 3.
Hereinafter, each component in the photocurable composition of the present invention will be described in detail.

[Outline of Photocurable Composition]
The photocurable composition in the present embodiment is
(A) an epoxy compound having two or more epoxy groups in one molecule and having an aromatic structure and / or an alicyclic structure (hereinafter sometimes referred to as component (A));
(B) an aromatic monofunctional epoxy compound having one epoxy group in one molecule (hereinafter sometimes referred to as (B) component);
(C) an acyclic aliphatic bifunctional epoxy compound having two epoxy groups in one molecule (hereinafter sometimes referred to as component (C)),
(D) a photobase generator (hereinafter sometimes referred to as component (D));
(E) a compound having a thiol group (hereinafter sometimes referred to as (E) component),
The ratio of the mass of the component (A) to the sum of the masses of the component (B) and the component (C) is:
((A)): ((B) + (C)) = within a range of 80:20 to 40:60.

The photocurable composition of this embodiment has delayed curing, and can be used as, for example, a delayed curing adhesive. Moreover, since the photocurable composition of this embodiment has delayed curing, sufficient working time can be secured even after irradiation with light, for example, ultraviolet rays. Furthermore, the curing reaction can be accelerated by heating.
In addition, for example, when the photocurable composition of the present embodiment is used in the production of a liquid crystal display device, for example, it is sufficient when the photocurable composition is filled between the cover panel and the display panel and cured. The cured product obtained by curing the composition and having the composition cured can be applied as a liquid crystal display device having high transparency and high visibility.
Furthermore, since the photocurable composition of the present embodiment exhibits sufficient reactivity even within the range of a thick film (for example, 500 μm or more and 3000 μm), a thin film (for example, 10 μm or more and 500 μm or more) depending on the application. Less than) to a thick film can be formed.

  In addition to the (A) component, the (B) component, the (C) component, the (D) component, and the (E) component, the photocurable composition in the present embodiment includes (F) an elastomer (hereinafter referred to as (F) ) (Sometimes referred to as a component). In addition, arbitrary components, such as various resin and an additive, may be mix | blended with the photocurable polymeric composition of this embodiment as needed in the range which does not impair properties, such as delayed-curing property.

[About component (A)]
The (A) component epoxy compound having two or more epoxy groups in one molecule and having an aromatic structure and / or an alicyclic structure has two or more epoxy groups in one molecule. In a form, it has 2 or more and 5 or less, for example, 2 or more and 4 or less.
The component (A) is an epoxy compound having an aromatic structure and / or an alicyclic structure, for example, an epoxy compound having at least one selected from an aromatic structure and an alicyclic structure in the main chain. Yes, and preferably an epoxy compound having an aromatic structure in the main chain.
Here, in the component (A), “aromatic structure and alicyclic structure” means that the main chain has a ring structure other than an epoxy group.

Examples of the component (A) usable in the present invention include bisphenols such as bisphenol A type epoxy resins, bisphenol F type epoxy resins, bisphenol S type epoxy resins, hydrogenated bisphenol A type epoxy resins, and hydrogenated bisphenol F type epoxy resins. Epoxy resin, biphenyl type epoxy resin having biphenyl skeleton, naphthalene ring-containing epoxy resin, anthracene ring-containing epoxy resin, alicyclic epoxy resin, dicyclopentadiene type epoxy resin having dicyclopentadiene skeleton, phenol novolac type epoxy resin, Cresol novolac type epoxy resin, triphenylmethane type epoxy resin, bromine-containing epoxy resin having aromatic structure and / or alicyclic structure, aliphatic epoxy resin having cyclic structure in skeleton, cyclic structure Aliphatic polyether-based epoxy resins having, or the like can be used triglycidyl isocyanurate. You may use combining these resin. The aromatic structure and the alicyclic structure may have a hetero atom, for example, Si, N, O, P, or S.
In one embodiment, a bisphenol-based epoxy resin, for example, a bisphenol A-type epoxy resin or a bisphenol F-type epoxy resin can be used.

The epoxy equivalent of component (A) is, for example, 150 (g / eq) or more and 240 (g / eq) or less, and in another form, 160 (g / eq) or more and 230 (g / eq) or less.
The epoxy equivalent can be measured, for example, according to the method described in JIS K-7236.

[About component (B)]
As the aromatic monofunctional epoxy compound having one epoxy group in one molecule, which is component (B), for example, phenyl glycidyl ether, p-tert-butylphenyl glycidyl ether, and the like can be used. More preferred is phenyl glycidyl ether. By using phenyl glycidyl ether, for example, the physical properties of the component (A) epoxy resin and the like are not impaired, and the photocurable composition of the present embodiment has a viscosity suitable for processing and is good. With excellent workability.
For example, when the component (D) contains a hydrophobic functional group, the component (D) has better compatibility with the component (B) and before kneading with the component (A) and the component (E). For example, the powdery component (D) can be dissolved in the component (B). Therefore, even if the coating film thickness of the photocurable cured product is in the range of 500 μm or more and 3000 μm, the composition has excellent reactivity.

  The epoxy equivalent of component (B) is, for example, 100 (g / eq) or more and 200 (g / eq) or less, and in another form, 120 (g / eq) or more and 180 (g / eq) or less.

[About component (C)]
The acyclic aliphatic bifunctional epoxy compound having two epoxy groups in one molecule as the component (C) is a compound having any one of ethylene glycol, propylene glycol, and tetramethylene glycol in the mother skeleton. Compounds containing at least one selected from the group are preferred.
Examples of the component (C) that can be used in the present invention include ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, and tetramethylene glycol diglycidyl ether. . More preferably, it is possible to use polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, and a mixture thereof that can control the crosslinking density.
Here, the “acyclic aliphatic bifunctional epoxy compound” is an epoxy compound that does not have a ring structure other than an epoxy group in the main chain and does not include the epoxy compound represented by the component (A). is there.

  For example, when the component (D) contains a hydrophobic functional group, the component (D) has better compatibility with the component (C), and before kneading with the components (A) and (E) For example, the powdery component (D) can be dissolved in the component (C). Therefore, even if the coating film thickness of the photocurable cured product is increased to 500 μm or more and 3000 μm, the composition has excellent reactivity.

  The epoxy equivalent of component (C) is, for example, 100 (g / eq) or more and less than 150 (g / eq), and in another form, 100 (g / eq) or more and 145 (g / eq) or less.

[About component (D)]
The photobase generator as component (D) includes a carboxylate having either a xanthone skeleton or a ketoprofen skeleton, a salt containing a borate anion, a quaternary ammonium salt, a carbamate compound, for example, a salt having a carbamate structure. A compound containing at least one selected from the group consisting of is preferred.
(D) When a carboxylate having either a xanthone skeleton or a ketoprofen skeleton or a salt containing a borate anion is used as a component, from a weak base such as an amine salt that can be included as a counter ion, an amidine, guanidine, phosphazene base, etc. It is possible to generate a strong base, and the reaction with an epoxy compound proceeds in a chain and has excellent reaction efficiency, so that it has excellent curability.
Here, the photocurable composition of the present embodiment may be reacted by, for example, irradiation with light such as ultraviolet rays according to the component (D) to be used. May be used together to advance the reaction.
(D) When using a quaternary ammonium salt as a component, it is excellent in curability by using imidazole and amidine as a base-reactive compound. In addition, by using these substances, for example, a curing reaction by heating can be used in combination, so that a composition having more excellent curing retardation can be obtained.
When a carbamate compound is used as the component (D), a carboxylate having either a xanthone skeleton or a ketoprofen skeleton, a salt containing a borate anion, or an ionic photobase generator such as a quaternary ammonium salt is more basic. Although it is not high, it is excellent in solubility in epoxy compounds, etc., and also in storage stability.
Of these, more preferably (2- (9-oxoxanthen-2-yl) propionic acid 1,5,7-triazabicyclo [4,4,0] deca-5 having a strong base and excellent reactivity. -Ene)), 2- (9-oxoxanthen-2-yl) propionic acid 1,8-diazabicyclo [5.4.0] undec-7-ene, 1,2-dicyclohexyl luo 4,4,5,5 -Tetramethyldiguadium n-butyltriphenylborate, 1,2-disopropyl-3- [bis (dimethylamino) methylene] guanidium 2- (3-benzoylphenyl) propinate can be used.

[About (E) component]
The compound having a thiol group as the component (E) is preferably a compound that does not include a compound having a dipropion group and thioglycolic acid as a mother skeleton in the molecule. Examples of the component (E) that can be used in the present invention include pentaerythritol tetrakis (3-mercaptobutyrate), 1,4-bis (3-mercaptobutyryloxy) butane, 1,3,5-tris (2- (3-sulfanylbutanoyloxy) ethyl) -1,3,5-triazinan-2,4,6-trione and the like can be used. More preferably, pentaerythritol tetrakis (3-mercaptobutyrate) and 1,4-bis (3-mercaptobutyryloxy) butane having further excellent reactivity can be used.

The thiol equivalent of the component (E) is, for example, 100 (g / eq) or more and 160 (g / eq) or less, and in another form, 105 (g / eq) or more and 150 (g / eq) or less.
The thiol equivalent can be measured according to a known method.

[About (F) component]
The elastomer as component (F) can further improve the physical properties and chemical properties of the cured product of the photocurable composition according to the present disclosure. For example, a cured product of a photocurable composition containing an elastomer has a physical property such as an improvement in strength, a decrease in elastic modulus, and an improvement in elongation compared to a cured product of a photocurable polymerization composition that does not contain an elastomer. Characteristics can be further improved. In addition, the photocurable composition containing the elastomer can further enhance the chemical interaction between the polar group in the elastomer and the adherend, compared to the photocurable composition not containing the elastomer, Changes in chemical properties may occur such that the photobase polymerizable substituent of the photocurable composition in the elastomer forms a chemical bond with the adherend. When such a change in chemical characteristics occurs, the adhesion (adhesive strength) between the cured product of the photocurable composition and the adherend may be improved.

The elastomer is formed of various polymer materials such as polyolefin, polystyrene, polyester, polyurethane, silicone, and epoxy. One type of elastomer can be used alone, or two or more types can be used in combination.
The form of the elastomer in the photocurable composition is preferably in a state dissolved in the component (A).

  When the elastomer of component (F) is, for example, an elastomer of an epoxy resin, the epoxy equivalent of component (F) is, for example, 280 (g / eq) or more and 1000 (g / eq) or less. (G / eq) or more and 1000 (g / eq) or less. In a certain form, it is 500 (g / eq) or more and 1000 (g / eq) or less.

The photocurable composition of the present invention may contain a sensitizer. A sensitizer is a compound which increases the activity with respect to light by combining with (D) component, and can be suitably selected unless the characteristic of the photocurable composition of this invention is impaired. Examples include, but are not limited to, fluorene derivatives, benzophenone derivatives, thioxanthone derivatives, benzyl ketal derivatives, benzoin derivatives, and the like.
(D) It is preferable to contain a sensitizer in the range of 0.1 to 30 parts by mass with respect to 100 parts by mass of the component.

[Preparation of Photocurable Composition]
The photocurable composition of this embodiment is prepared by mixing the component (A), the component (B), the component (C), the component (D), and the component (E).
The ratio of the mass of component (A) to the sum of the masses of component (B) and component (C) is:
((A) component): ((B) component + (C) component) = within a range of 80:20 to 40:60.
When the ratio of the mass of the component (A) and the sum of the masses of the component (B) and the component (C) is within the scope of the present invention, the component (D), for example, the powdered component (D) Can be more effectively dissolved in the component (B) and the component (C). Furthermore, it can suppress that the delay time of hardening becomes unnecessarily long, and can show the outstanding sclerosis | hardenability, without impairing the physical property of hardened | cured material.
The “delay time” refers to the time during which the photocationic polymerization composition is kept in a liquid state after being irradiated with active energy rays.
In another embodiment, ((A) component): ((B) component + (C) component) = within a range of 80:20 to 55:45, for example, ((A) component): ((B ) Component + (C) component) = within a range of 80:20 to 60:40. Within such a range, the (A) component, the (B) component, and the (C) component have a relationship so that they have better delayed curability, and are further excellent in reactivity and optical properties. A cured product of the composition can be obtained.

[Liquid Crystal Display]
The present invention further provides a liquid crystal display device. A liquid crystal display device 4 of the present embodiment is shown in FIG. FIG. 2 includes a cured product 1 of a photocurable composition, a cover panel 5, a housing 6, a display panel 7, and a circuit board 8. Thus, by arranging the cured product 1 of the photocurable composition between the cover panel 5 and the display panel 7, it can be applied as the liquid crystal display device 4 with high visibility.

(Example)
Hereinafter, the present invention will be described more specifically with reference to examples. In addition, this invention is not limited at all by the following examples. Unless otherwise specified, parts and% in the examples are based on mass.

Table 1 shows conditions, such as the compounding quantity of (A) component-(F) component in each Example and a comparative example, and it demonstrates in detail later. In addition, the measurement results and determination contents of each example and comparative example are summarized.
First, in order to evaluate the reactivity and transparency of the photocurable composition, a test piece 2 shown in FIG. 1 is prepared. The test piece 2 includes a cured product 1 of a photocurable composition and a glass 3. Example 1 will be described as a preparation example of the cured product 1 of the photocurable composition.

(Example 1)
As component (A), a bisphenol A type epoxy resin (manufactured by Mitsubishi Chemical, jER828XA) was prepared. As component (B), phenylglycidyl ether (manufactured by Nagase ChemteX, EX-141) was prepared. As component (C), ethylene glycol diglycidyl ether (manufactured by Nagase ChemteX, EX-810) was prepared. (D) (2- (9-oxoxanthen-2-yl) propionic acid 1,5,7-triazabicyclo [4,4,0] dec-5-ene)) (Tokyo Chemical Industry, O0396) ) Was prepared. As component (E), pentaerythritol tetrakis (3-mercaptobutyrate) (manufactured by Showa Denko, PE-1) was prepared. As component (F), an aliphatic epoxy resin (manufactured by Nagase ChemteX, R-15EPT) was prepared. In order to increase the reactivity, 2-isopropylthioxanthone (manufactured by Wako Pure Chemical Industries, Ltd.) was prepared as a sensitizer.

First, a mixed liquid of 1.300 parts by mass of component (B) and 2.080 parts by mass of component (C) is prepared, and 0.591 parts by mass of powdered (D) component and powdered sensitizer are prepared therein. 0.118 part by mass was added and dissolved. Add the mixture prepared above, (A) component 12.002 parts by mass, (E) component 15.547 parts by mass, and (F) component 7.691 parts by mass, use a disper, and knead well at room temperature Then, a photocurable composition was produced.
Each characteristic was evaluated using the test piece 2 shown below.

(Preparation of test piece 2)
The photocurable composition prepared as described above was applied onto the glass 3 using a slit nozzle so that the coating film thickness was 1000 μm. Then, it bonded together to the other glass 3 using the vacuum bonding apparatus.
Thereafter, light irradiation was performed, and the mixture was left at room temperature for 1 hour, and then heat-treated.
For the light irradiation, a belt conveyor type ultraviolet irradiator having high-pressure mercury or the like was used, and an ultraviolet ray of 6000 mJ / cm ² was irradiated with an integrated light amount. The heat treatment was performed at 80 ° C. for 30 minutes. The above operation was performed, and a test piece 2 having a cured product 1 of a photocurable composition disposed between two glasses 3 was produced.

(Solubility)
The solubility was visually determined as to whether or not the powdered component (D) could be dissolved in the components (B) and (C). When a powdery sensitizer was included in the blend, it was determined whether or not it could be dissolved in the component (B) and the component (C) together with the component (D). The conditions for dissolution were a temperature of 25 ° C. and a kneading time of 1 minute.
In Table 1, as a result of the judgment, the case of dissolution is indicated by “◯”, and the case of not dissolution is indicated by “X”. In addition, it was judged as “◯” only when completely dissolved.

(Reactivity)
Regarding the reactivity, when the test piece 2 was produced, the photocurable composition was used in a total of four steps: the light irradiation step, the room temperature standing step (1 hour), the heat treatment step, and the room temperature standing step (1 hour). It was judged whether or not was cured. Table 1 shows the judgment results in each step as “uncured”, “semi-cured”, or “cured”.
“Semi-cured” refers to a state in which fluidity is lost in the process where the photocurable composition is polymerized into a resin and the curing reaction can be presumed to continue.
Comprehensive evaluation (judgment) is “◯” when curing can be confirmed after the heat treatment step, “△” after standing at room temperature for 1 hour after the heat treatment step, “Δ” when curing is confirmed, 1 hour after the heat treatment step In the case where curing could not be confirmed after standing at room temperature, “x” was given.

(optical properties)
About the optical characteristic, the total light transmittance was evaluated for the test piece 2 using the self-recording spectrophotometer U-4000 (made by Hitachi, Ltd.). Table 1 shows the determination results. A total light transmittance of 95% or more is indicated by “◯”, 90% or more and less than 95% is indicated by “Δ”, and less than 90% is indicated by “X”.

(Comprehensive judgment)
When each of the solubility, reactivity, and optical properties showed a determination of “◯”, the comprehensive determination was determined as “◎”. When there was “x” in any one of the three judgments, “x” was judged as the overall judgment. Otherwise, it was determined as “◯” as a comprehensive determination.

Regarding the solubility, all of Examples 1 to 4 were evaluated as “◯”, whereas Comparative Example 1 not including the component (B) and the component (C) was evaluated as “x”. By blending the (B) component and the (C) component, it becomes possible to dissolve the powdered (D) component and the sensitizer, and excellent reactivity can be obtained even with a coating film thickness of 1000 μm. It is thought. From this, it became clear that it is preferable to blend not only the component (A) but also the component (B) and the component (C) as the epoxy compound.
Further, regarding the solubility, all of Examples 1 to 4 were evaluated as “◯”, whereas Comparative Example 2 was evaluated as “×”. This is because, in Comparative Example 2, the ratio of the mass of the component (A) to the total mass of the components (B) and (C) is (A) component: (B) component + (C) component = 87. 5: 12.5, and the total amount of the component (B) and the component (C) is outside the scope of the present invention. The powdered component (D) and a sensitizer that can be added are This is probably because the component (C) could not be sufficiently dissolved in the component.
On the other hand, Examples 1 to 4 are all evaluated as ◯, whereas Comparative Example 3 is evaluated as ◯. However, the reactivity was evaluated as x. This is the mass ratio of the component (A) and the sum of the mass ratios of the components (B) and (C). The component (A) :( B) + (C) component = 38.7: 61. 3, the powder (D) component and the sensitizer can be sufficiently dissolved by increasing the amount of the component (B) and the component (C), but sufficient in the reaction between the epoxy compound and the thiol compound. It is thought that the reactivity was deteriorated because a crosslinked structure could not be formed.

  From the above viewpoint, the composition has the above-described configuration, and the mass ratio of the component (A), the component (B), and the component (C) is (A) component: (B) + (C) component = 80: 20 By being in the range of ˜40: 60, various effects can be obtained, and for example, a photocurable composition excellent in solubility, reactivity, and optical properties can be obtained.

  The photocurable composition of the present invention can be used as a bonding material for the liquid crystal display device 4 and can have higher visibility than when no bonding material is used. The photocurable composition of the present invention can be applied as a coating material and an adhesive in addition to a bonding material for use in a liquid crystal display device.

DESCRIPTION OF SYMBOLS 1 Hardened | cured material of photocurable composition 2 Test piece 3 Glass 4 Liquid crystal display device 5 Cover panel 6 Case 7 Display panel 8 Circuit board 9 Hardened | cured material 10 Glass with ITO

Claims (6)

(A) an epoxy compound having two or more epoxy groups in one molecule and having an aromatic structure and / or an alicyclic structure;
(B) an aromatic monofunctional epoxy compound having one epoxy group in one molecule;
(C) an acyclic aliphatic bifunctional epoxy compound having two epoxy groups in one molecule;
(D) a photobase generator;
(E) a compound having a thiol group,
The ratio of the mass of the (A) epoxy compound to the total mass of the (B) aromatic monofunctional epoxy compound and the (C) acyclic aliphatic bifunctional epoxy compound is:
((A)): ((B) + (C)) = a photocurable composition that is within the range of 80:20 to 40:60.   The (C) acyclic aliphatic bifunctional epoxy compound includes at least one selected from the group consisting of compounds having any one of ethylene glycol, propylene glycol, and tetramethylene glycol in the mother skeleton. The photocurable composition as described. The (D) photobase generator includes at least one selected from the group consisting of a carboxylate having either a xanthone skeleton or a ketoprofen skeleton, a salt containing a borate anion, a quaternary ammonium salt, and a carbamate compound. The photocurable composition according to claim 1 or 2.   The photocurable resin according to any one of claims 1 to 3, wherein the compound (E) having a thiol group does not include a compound having a dipropion group and thioglycolic acid as a mother skeleton in the molecule. Composition.   Furthermore, the photocurable composition of any one of Claims 1-4 containing (F) elastomer.   The liquid crystal device using the photocurable composition of any one of Claims 1-5.

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