KR20150145415A - Oxime ester compound and a photopolymerizable composition comprising the same - Google Patents

Abstract

The present invention relates to an oxime ester-based compound and a photopolymerizable composition comprising the same and, more specifically, to a photopolymerizable composition comprising a photopolymerizable compound and a photopolymerization initiator, wherein the photopolymerization initiator comprises an oxime ester-based compound. The photopolymerizable composition has an excellent effect on pattern linearity.

Description

TECHNICAL FIELD The present invention relates to an oxime ester compound and a photopolymerizable composition containing the oxime ester compound and a photopolymerizable composition containing the oxime ester compound.

The present invention relates to oxime ester compounds and photopolymerizable compositions containing them, and more particularly to a photopolymerizable composition comprising a photopolymerizable compound and a photopolymerization initiator, wherein the photopolymerization initiator comprises an oxime ester compound.

The photoactive compound is a substance that generates chemically active atoms or molecules by decomposing and absorbing light, and is widely used as a photopolymerization initiator for various compositions such as photo-curable ink, photosensitive printing plate, photoresist and the like.

As typical examples of the photopolymerization initiator, various kinds of acetophenone based compounds, benzophenone based compounds, triazine based compounds, nonimidazole based compounds, acylphosphine oxide based compounds and oxime ester based compounds are known, Absorbs ultraviolet light to hardly show color, has a high radical generation efficiency, and is excellent in compatibility and stability with photoresist composition materials.

In the case of a photopolymerization initiator having an oxime ester compound, it is easy to synthesize various photopolymerization initiators capable of regulating the absorption region of the photopolymerization initiator by introducing an appropriate substituent into the compound.

Oxime ester compound can polymerize and cure a polymerizable compound having an unsaturated bond by irradiating light of 365 to 435 nm to a photopolymerizable composition and is used for a black matrix, a color filter, a column spacer, a flexible insulating film, a photoresist composition for an overcoat .

Therefore, the photopolymerization initiator has a high sensitivity to a long wavelength light source such as 365 to 435 nm, has good photopolymerization reactivity, is easy to produce, has high thermal stability and storage stability and is easy to handle, and has excellent properties for a solvent such as propylene glycol monomethyl ether acetate There is a continuing need for new photopolymerization initiators suitable for a variety of applications that meet the needs of industrial sites, such as satisfactory solubility.

Exemplary oxime ester compounds include oxime ester compounds using p-dialkylaminobenzene in U.S. Patent No. 4,255,513, acrylamino-substituted oxime ester compounds in U.S. Patent No. 4,202,697, U.S. Patent No. 4,590,145 Include benzophenone oxime ester compounds and the like.

However, when a conventionally known oxime ester compound is used as a photopolymerization initiator, decomposition products generated by light at the time of exposure adhere to the mask, resulting in pattern defects in the printing process, resulting in a decrease in the yield. Further, there is a problem that the decomposition temperature is 240 ° C or lower, and the photopolymerization initiator decomposes in the heat curing step after the development treatment, thereby deteriorating the adhesion and alkali resistance of the photopolymerizable composition.

Therefore, there is a high demand for oxime ester compounds having a novel structure that can fundamentally solve such problems, and photopolymerizable compositions containing them.

U.S. Patent No. 4,255,513 U.S. Patent No. 4,202,697 U.S. Patent No. 4,590,145

An object of the present invention is to provide an oxime ester compound having a novel structure.

In addition, the present invention provides a photopolymerizable composition comprising a photopolymerizable compound and a photopolymerization initiator, wherein the photolymerizable composition contains the novel oxime ester compound of the present invention as the photopolymerization initiator and has excellent linearity of pattern, Which is capable of improving the compatibility with the photopolymerizable composition of the present invention.

In order to achieve the above object,

The present invention provides an oxime ester compound represented by the following general formula (1).

[Chemical Formula 1]

R is an alkyl group having 1 to 20 carbon atoms,

And n is an integer of 6 to 21.

The present invention also provides a photopolymerizable composition comprising a photopolymerizable compound and a photopolymerization initiator, wherein the photopolymerization initiator comprises an oxime ester compound represented by the following general formula (1).

[Chemical Formula 1]

R is an alkyl group having 1 to 20 carbon atoms,

And n is an integer of 6 to 21.

When the light is irradiated to the novel oxime ester compound of the present invention, long-chain alkyl radicals are generated. Since the radicals are long, the radicals are less mobile and the curing proceeds only in the region irradiated with light. The ester compound has characteristics of excellent linearity of the pattern.

In addition, the novel oxime ester compound of the present invention has high solubility and is excellent in compatibility with other components, and has little color when absorbing ultraviolet rays, which is advantageous for application of an optical composition.

Therefore, the photopolymerizable composition comprising the photopolymerizable compound and the photopolymerization initiator of the present invention contains the novel oxime ester compound of the present invention as a photopolymerization initiator, and thus has an excellent linearity of the pattern upon irradiation with light, .

1 is a ¹ H-NMR spectrum of an oxime ester derivative of formula (2) prepared in Preparation Example 1.
2 is a ¹ H-NMR spectrum of the oxime ester compound of Chemical Formula 3 prepared in Preparation Example 2. FIG.

Hereinafter, the present invention will be described in more detail.

The present invention relates to an oxime ester compound represented by the following general formula (1).

[Chemical Formula 1]

R is an alkyl group having 1 to 20 carbon atoms,

And n is an integer of 6 to 21.

In the oxime ester compound of Formula 1, R is preferably an alkyl group having 1 or 6 carbon atoms.

The oxime ester compound of formula (1) may be at least one selected from the group consisting of the following formulas (2) to (3), but is not limited thereto.

(2)

(3)

The oxime ester compound of Formula 1, which is a novel compound of the present invention, can be prepared by (1) reacting diphenylsulfide and alkylcarboxychloride to prepare an acid; (2) reacting the ashes and nitrite to produce an oxime; And (3) reacting the oxime with an alkyl carboxy chloride to produce the oxime ester compound of Formula 1. The mechanism of Scheme 1 is shown below. In addition, R and n of the oxime ester compound of formula (1) are determined according to the alkyl groups of the alkyl carboxy chloride in steps (1) and (3).

[Reaction Scheme 1]

The oxime ester compound of Formula 1, which is a novel compound of the present invention, includes a diphenylsulfide group. Therefore, when the oxime ester compound of Formula 1 is irradiated with light, the photoreactivity of the oxime ester compound of Chemical Formula 1 is improved due to the energy transfer of the diphenylsulfide group, and the light efficiency can be maximized. Further, it can be used for an optical composition without coloring even after irradiation with light.

Accordingly, the present invention provides a photopolymerizable composition using the oxime ester compound of Formula 1 as a photopolymerization initiator, taking advantage of the oxime ester compound of Formula 1.

More specifically, the present invention provides a photopolymerizable composition comprising a photopolymerizable compound and a photopolymerization initiator, wherein the photopolymerization initiator comprises an oxime ester compound of the following general formula (1).

[Chemical Formula 1]

R is an alkyl group having 1 to 20 carbon atoms,

And n is an integer of 6 to 21.

The photopolymerizable compound is a component for supplementing light efficiency and color change, and the kind thereof is not particularly limited, but an acrylic oligomer having an ethylenic unsaturated bond is preferable.

The acrylic oligomer having an ethylenically unsaturated bond is a photocurable acrylic oligomer configured to be capable of ultraviolet curing reaction by a chemical reaction of an acrylic oligomer precursor and a monomer for introducing an ethylenic unsaturated bond.

The acrylic oligomer precursor may be a copolymer of a (meth) acrylic monomer having an alkyl group having 1 to 14 carbon atoms and a polymerizable monomer. The method of producing the acrylic oligomer precursor is not particularly limited, and can be produced by methods such as bulk polymerization, solution polymerization, emulsion polymerization or suspension polymerization, which are commonly used in the art, and bulk polymerization is preferable. A polymerization initiator such as azo type, peroxide type, acetal type, hemiacetal type, and redox type can be used as a solvent usually used in polymerization.

The alkyl group of the (meth) acrylic monomer having an alkyl group having 1 to 14 carbon atoms includes an aliphatic alkyl group and an aromatic alkyl group. Examples of the monomer include methyl (meth) acrylate, ethyl (meth) acrylate, Butyl (meth) acrylate, isobutyl (meth) acrylate, n-butyl (meth) acrylate, (Meth) acrylate, ethylhexyl (meth) acrylate, ethylbutyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl , Isobornyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, and lauryl (meth) acrylate. These monomers may be used alone or in combination of two or more.

Specific examples of the polymerizable monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (Meth) acrylate, 2-hydroxypropyleneglycol (meth) acrylate, 2-hydroxypropyleneglycol (meth) acrylate and 4-hydroxybutylvinylether A monomer having a hydroxy group; And monomers having a carboxyl group such as (meth) acrylic acid, crotonic acid, maleic acid, itaconic acid and fumaric acid. These polymerizable monomers may be used alone or in combination of two or more.

The kind of the monomer for introducing the ethylenically unsaturated bond is not particularly limited. Preferably, however, an isocyanate monomer having an isocyanate group and a double bond at the same time in one molecule is used, and for example, 2-isocyanatoethyl (meth) acrylate can be given.

The method of producing the photocurable acrylic oligomer preferably used as the photopolymerizable compound is not particularly limited. Specifically, for example, 0.5 to 20 parts by weight of an isocyanate monomer and 0.001 to 0.5 parts by weight of a catalyst are added to 100 parts by weight of the acrylic oligomer precursor prepared from the acrylic oligomer precursor, and reacted. The catalyst is not particularly limited as long as it can accelerate the reaction of a hydroxyl group or an isocyanate group with a carboxyl group or an isocyanate group contained in an acrylic oligomer precursor. For example, an organic tin compound, an organic silver compound or a mixture thereof can be used.

The photopolymerizable compound may have a weight average molecular weight (polystyrene conversion, Mw) of from 200,000 to 100 as measured by Gel Permeation Chromatography (GPC).

The photopolymerization initiator is characterized by containing an oxime ester compound represented by the following formula (1).

[Chemical Formula 1]

R is an alkyl group having 1 to 20 carbon atoms,

And n is an integer of 6 to 21.

In the oxime ester compound of Formula 1, R is preferably an alkyl group having 1 or 6 carbon atoms.

The oxime ester compound of formula (1) may be at least one selected from the group consisting of the following formulas (2) to (3), but is not limited thereto.

(2)

(3)

The oxime ester compound of Formula 1 used as a photopolymerization initiator of the photopolymerizable composition of the present invention has a long alkyl chain since n is an integer of 6 to 21. Therefore, long-chain alkyl radicals are produced when light is irradiated to the oxime ester compound of Chemical Formula 1, and since the radicals are long, the curing proceeds only in the region irradiated with light because of small mobility of radicals. Therefore, when a pattern is formed using a photopolymerizable composition comprising the oxime ester compound of Formula 1 as a photopolymerization initiator, a pattern having excellent linearity can be obtained.

The photopolymerization initiator is contained in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the solid content of the photopolymerizable compound. If the content is less than 0.01 part by weight, the overall curability of the photopolymerizable composition is lowered. If the content is more than 10 parts by weight, the transmittance of ultraviolet light is lowered and the degree of curing at the core part is lowered.

In addition, the photopolymerizable composition of the present invention may further comprise a solvent, and if the solvent is effective for dissolving other components contained in the photopolymerizable composition, the solvent used in a conventional photopolymerizable composition is not particularly limited and may be used Ethers, aromatic hydrocarbons, ketones, alcohols, esters or amides are particularly preferred.

Examples of the ethers include ethylene glycol monoalkyl ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, and ethylene glycol monobutyl ether; Diethylene glycol dialkyl ethers such as diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dipropyl ether and diethylene glycol dibutyl ether; Ethylene glycol alkyl ether acetates such as methyl cellosolve acetate and ethyl cellosolve acetate; And alkylene glycol alkyl ether acetates such as propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, methoxybutyl acetate, and methoxypentyl acetate.

Examples of the aromatic hydrocarbons include benzene, toluene, xylene, and mesitylene.

Examples of the ketones include methyl ethyl ketone, acetone, methyl amyl ketone, methyl isobutyl ketone, and cyclohexanone.

Examples of the alcohols include ethanol, propanol, butanol, hexanol, cyclohexanol, ethylene glycol, and glycerin.

Examples of the esters include esters such as ethyl lactate, butyl lactate, ethyl 3-ethoxypropionate and methyl 3-methoxypropionate; And cyclic esters such as? -Butyrolactone.

Of these solvents, organic solvents having a boiling point of 100 ° C to 200 ° C are more preferably used in terms of coatability and dryness. Examples thereof include propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, cyclohexanone, ethyl lactate , Butylacetate, ethyl 3-ethoxypropionate and methyl 3-methoxypropionate.

These solvents may be used alone or in combination of two or more.

In addition, the photopolymerizable composition of the present invention may further include known additives such as a colorant, an alkali-soluble resin and a surfactant.

The photopolymerizable composition of the present invention is applicable for various purposes. For example, it can be applied to a printing ink, a finishing material, a covering material, a point / adhesive, and the like, and absorbs ultraviolet rays to hardly color, so that it can be applied as an optical composition for various image display devices requiring transparency.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to be illustrative of the invention and are not intended to limit the scope of the claims. It will be apparent to those skilled in the art that such variations and modifications are within the scope of the appended claims.

<Formula 1> Oxime  Preparation of ester compounds>

Manufacturing example  1. A compound of formula Oxime  Ester compound production

1-1. Ashes  Produce

20 g (107.5 mmol) of diphenyl sulfide was added to a solution of 100 g of dichloroethane and 21.7 g (163 mmol) of aluminum chloride, and 17.4 g (107.5 mmol) of octyl carboxy chloride was added dropwise at a temperature of 6 캜 or lower. After stirring for 1 hour, the reaction mixture was poured into ice water, ethyl acetate was added, and the mixture was subjected to oil-water separation. Thereafter, the separated organic layer was washed with water, dried over anhydrous magnesium sulfate, and then the solvent was removed to obtain 26.3 g of ashes.

The obtained ashes were analyzed by ¹ H-NMR and their structure was confirmed. As a result, it was confirmed that they had the structure of the following formula (4), and the spectrum was as follows.

[Chemical Formula 4]

_{^{1 H-NMR (CDCl 3,}} ppm): 2.01 (t, 3H), 2.55 (m, 10H), 3.65 (s, 2H), 7.00 (t, 1H), 7.07 (t, 2H), 7.20 (d, 2H), 7.32 (d, 2H), 7.66 (d, 2H).

1-2. Oxime  Produce

5.4 g (52 mmol) of isobutyl nitrite was added to a mixture of 13 g (47.4 mmol) of the acyl group of the formula 6 obtained in the above 1-1, 3.6 g (35 mmol) of concentrated hydrochloric acid and 50 g of dimethylformamide, Lt; / RTI &gt; Thereafter, ethyl acetate and water were added to the reaction solution, and subjected to oil-water separation. The separated organic layer was washed with water. Thereafter, hexane was added to the organic layer on which the solid was precipitated, and the mixture was filtered. The obtained solid was vacuum dried to obtain 10.6 g of an oxime.

The obtained oxime was analyzed by ¹ H-NMR and its structure was confirmed. As a result, it was confirmed that it had the structure of Chemical Formula 5, and the spectrum was as follows.

 [Chemical Formula 5]

_{^{1 H-NMR (CDCl 3,}} ppm): 2.01 (t, 3H), 2.65 (m, 8H), 3.25 (t, 2H), 7.02 (t, 1H), 7.09 (t, 2H), 7.18 (d, 2H), 7.31 (d, 2H), 7.62 (d, 2H), 12.8 (s, 1H).

1-3. 2 Oxime  Ester compound production

A solution obtained by mixing 4 g (13.2 mmol) of the oxime of the formula 5 obtained in 1-2 above, 2.1 g (27 mmol) of pyridine and 12 g of dimethylformamide was maintained at -10 ° C or lower, and 4- 3.6 g (15 mmol) of heptylbenzoyl chloride was added dropwise. After that, the mixture was stirred at 5 캜 for 2 hours. Ethyl acetate and water were added to the reaction mixture, and the mixture was subjected to oil-water separation. The separated organic layer was washed with water. Thereafter, the washed organic layer was dried over anhydrous magnesium sulfate, and the solvent was removed to obtain 3.5 g of oxime ester compound.

The oxime ester compound thus obtained was analyzed by ¹ H-NMR and an elemental analyzer to confirm its structure. As a result, it was confirmed that the compound had a structure of the following formula (2). The spectrum is shown in FIG. 1 and the result of elemental analysis is as follows.

(2)

Elemental analysis: C, 75.12; H, 7.58; N, 2.57; S, 5.91

Manufacturing example  2. The compound of formula Oxime  Ester compound production

2-1. Ashes  Produce

20 g (107.5 mmol) of diphenyl sulfide was added to a solution of 100 g (1 mol) of dichloroethane and 21.7 g (163 mmol) of aluminum chloride, and 9.94 g (107.5 mmol) of propylcarboxy chloride was added dropwise at a temperature of 6 ° C or lower. After stirring for 1 hour, the reaction mixture was poured into ice water, ethyl acetate was added, and the mixture was subjected to oil-water separation. Thereafter, the separated organic layer was washed with water, dried over anhydrous magnesium sulfate, and then the solvent was removed to obtain 20.7 g of ashes.

The structure of the obtained aseptic body was as shown in the following formula (6).

[Chemical Formula 6]

2-2. Oxime  Produce

5.4 g (52 mmol) of isobutyl nitrite was added to a mixture of 13 g (47.4 mmol) of the acyl group of the formula 6 obtained in the above 2-1, 3.6 g (35 mmol) of concentrated hydrochloric acid and 50 g of dimethylformamide, Lt; / RTI &gt; Thereafter, ethyl acetate and water were added to the reaction solution, and subjected to oil-water separation. The separated organic layer was washed with water. Thereafter, hexane was added to the organic layer on which the solid precipitated, and the mixture was filtered. The resulting solid was dried under reduced pressure to obtain 19.8 g of an oxime.

The structure of the obtained oxime was as shown in the following formula (7).

(7)

2-3. (3) Oxime  Ester compound production

A mixture of 3.6 g (13.2 mmol) of the oxime of the formula 7 obtained in 2-2, 2.1 g (27 mmol) of pyridine and 12 g (164.2 mmol) of dimethylformamide was maintained at -10 ° C or lower, 3.6 g (15 mmol) of 4-heptylbenzoyl chloride was added dropwise to the mixed solution. After that, the mixture was stirred at 5 캜 for 2 hours. Ethyl acetate and water were added to the reaction mixture, and the mixture was subjected to oil-water separation. The separated organic layer was washed with water. Thereafter, the washed organic layer was dried over anhydrous magnesium sulfate, and the solvent was removed to obtain 3.5 g of oxime ester compound.

The obtained oxime ester compound was analyzed by ¹ H-NMR and an elemental analyzer to confirm its structure. As a result, it was confirmed that the compound had a structure of the following formula (3). The spectrum is shown in FIG. 2, and the result of elemental analysis is as follows.

(3)

Elemental analysis: C, 73.51; H, 6.61; N, 2.94; S, 6.74

< Photopolymerization  Composition Preparation>

Example  One.

As a photopolymerizable compound, 50 g of bisphenol A glycerolate (1 glycerol / phenol) diacrylate having the following general formula (8) and 10 g of dipentaerythritol hexaacrylate, 40 g of carbon black as a coloring agent as an additive, 2 was added to 100 g of a propylene glycol monomethyl ether acetate solvent, and the mixture was stirred for 30 minutes to prepare a photopolymerizable composition.

[Chemical Formula 8]

Example  2.

A photopolymerizable composition was prepared in the same manner as in Example 1 except that the oxime ester compound of Formula 3 prepared in Preparation Example 2 was used as a photopolymerization initiator.

Comparative Example  One.

A photopolymerizable composition was prepared in the same manner as in Example 1 except that 2,4,6-trimethylbenzoyldiphenylphosphine oxide (TPO, BASF Corp.) was used as a photopolymerization initiator.

Comparative Example  2.

The procedure of Example 1 was repeated except that OXE-01 (1,2-octanedione-1- [4- (phenylthio) phenyl] -2-O-benzoyloxime, Ciba) was used as a photopolymerization initiator To prepare a photopolymerizable composition.

Comparative Example  3.

Except that OXE-02 (1- [9-ethyl-6- (2-methylbenzoyl) -9H-carbazol-3-yl] ethanone-1-O-acetyloxime, Ciba) was used as a photopolymerization initiator Was prepared in the same manner as in Example 1 to prepare a photopolymerizable composition.

Experimental Example  One. Photopolymerization  Evaluation of pattern accuracy and straightness of composition

The photopolymerizable compositions of Examples 1 to 2 and Comparative Examples 1 to 3 were coated on a glass substrate having a clean surface of 1 mm in thickness using a spin coater so that the film thickness after drying was 1.0 占 퐉, Minute to form a photopolymerizable composition film. The photopolymerizable composition film was irradiated with ultraviolet rays selectively through a negative mask having a line width of 20 mu m and spray-developed at 25 DEG C for 60 seconds in a 0.5 wt% sodium carbonate aqueous solution to form a black matrix.

The formed black matrix was observed with a microscope to measure the precision of the pattern, and the linearity of the line was evaluated. The evaluation criteria are as follows.

<Accuracy Evaluation Standard>

The line width of the patterned film cured through a negative mask having a line width of 20 mu m was subtracted by 20 mu m, and the smaller the numerical value (5 mu m or less), the higher the accuracy.

<Straightness Evaluation Standard>

During microscopic observation,

No fine bending or dropping was observed on the side of the straight line: ○

Fine bending or dropout was observed but only in a small part: △

Fine bend or drop was observed at the front of the pattern: x

The precision and straightness results of the pattern are shown in Table 1 below.

division Precision Straightness Example 1 3μm ○ Example 2 3μm ○ Comparative Example 1 7μm △ Comparative Example 2 7μm △ Comparative Example 3 9μm ×

From the results of the above Table 1, it can be seen that the pattern of the black matrix prepared from the photopolymerizable composition of Examples 1 and 2, in which the oxime ester compound of the present invention was used as a photopolymerization initiator, showed a slight increase in line width, No dropouts were observed, showing excellent results in accuracy and straightness.

However, the pattern of the black matrix prepared from the photopolymerizable composition of Comparative Examples 1 to 3, in which a compound not corresponding to the oxime ester compound of the present invention was used as a photopolymerization initiator, greatly increased the line width, and the curvature and the dropout Respectively.

Therefore, it can be confirmed that the photopolymerizable composition using the oxime ester compound of the present invention as a photopolymerization initiator is excellent in the linearity of the pattern, and is capable of producing a pattern more precisely.

Claims (10)

An oxime ester compound represented by the following formula (1).
[Chemical Formula 1]

R is an alkyl group having 1 to 20 carbon atoms,
And n is an integer of 6 to 21. The oxime ester compound according to claim 1, wherein R in the formula (1) is an alkyl group having 1 or 6 carbon atoms. The oxime ester-based compound according to claim 1, wherein the formula (1) is at least one selected from the group consisting of the following formulas (2) to (3).
(2)

(3)

A photopolymerizable composition comprising a photopolymerizable compound and a photopolymerization initiator, wherein the photopolymerization initiator comprises an oxime ester compound represented by the following general formula (1).
[Chemical Formula 1]

R is an alkyl group having 1 to 20 carbon atoms,
And n is an integer of 6 to 21. 5. The photopolymerizable composition according to claim 4, wherein the photopolymerizable compound comprises an acrylic oligomer having an ethylenic unsaturated bond. The photopolymerizable composition according to claim 5, wherein the acrylic oligomer having an ethylenically unsaturated bond has a GPC weight average molecular weight of 200,000 to 1,000,000. The photopolymerizable composition according to claim 4, wherein R in the formula (1) is 1 or 6 carbon atoms. [4] The photopolymerizable composition according to claim 4, wherein the formula (1) is at least one selected from the group consisting of the following formulas (2) to (3).
(2)

(3)

The photopolymerizable composition according to claim 4, wherein the photopolymerization initiator is contained in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the photopolymerizable compound. 5. The photopolymerizable composition of claim 4, wherein the photopolymerizable composition further comprises a solvent.

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