JP6871667B2 - Curable composition and its cured product - Google Patents

Description

The present invention contains a polyfunctional (meth) acrylate having a 9,9-bis condensed polycyclic arylfluorene skeleton and a specific monofunctional (meth) acrylate, and has excellent handleability and a high refractive index. The present invention relates to a curable composition capable of forming a cured product and the cured product thereof.

The polyfunctional (meth) acrylate having a 9,9-bisarylfluorene skeleton is excellent in various properties such as optical properties (high refractive index, low birefringence), mechanical properties, and heat resistance. Therefore, the curable composition containing the polyfunctional (meth) acrylate is effectively used as an optical overcoating agent, an optical film (such as a display film such as an antireflection film), and an optical material such as a lens. .. In recent years, curable materials having a higher refractive index have been demanded and are being developed with the advancement of high functionality or added value of optical materials and further development of applications.

For example, in Japanese Patent Application Laid-Open No. 2009-173648 (Patent Document 1), a polyfunctional (meth) acrylate having a 9,9-bis condensed polycyclic arylfluorene skeleton has a high refractive index, high hardness, and high heat resistance. It is disclosed that a cured product having excellent properties such as can be formed. In the examples of this document, a viscous body containing 9,9-bis [6- (2-acryloyloxyethoxy) -2-naphthyl] fluorene as a main component is prepared.

However, probably because the 9,9-bis condensed polycyclic arylfluorene skeleton has high crystallinity, the polyfunctional (meth) acrylate is a solid white powder at room temperature and is handled in the form of a curable composition. Was difficult.

As a method for improving the handleability of the curable composition, a method of adding a diluent such as a solvent or a reactive diluent is known. The reactive diluent does not require a step of removing the solvent in the formation of the cured product, has a wide range of uses, and is often preferably used. For example, International Publication No. 2013/022065 (Patent Document 2) describes specific polyfunctional (meth) acrylates having a 9,9-bisphenylfluorene skeleton and monofunctional (meth) acrylates such as aromatic (meth) acrylates. It is disclosed that a curable composition containing a meta) acrylate can improve handleability, refractive index and scratch resistance in a well-balanced manner. In the examples of this document, 9,9-bis [acryloyloxy (poly) ethoxyphenyl] fluorene and monofunctional acrylates such as phenoxyethyl acrylate, phenylthioethyl acrylate and / or o-phenylphenol monoethoxyacrylate are used. A curable composition containing the mixture has been prepared.

Further, Japanese Patent Application Laid-Open No. 2015-199952 (Patent Document 3) describes a specific polyfunctional (meth) acrylate having a 9,9-bisphenylfluorene skeleton and a specific monofunctional (meth) having an aryl group. It is disclosed that a curable composition containing an acrylate can improve handleability, refractive index and scratch resistance in a well-balanced manner. In the examples of this document, a polyfunctional acrylate having a 9,9-bis [acryloyloxy (poly) alkoxyphenyl] fluorene skeleton and 2- (2-naphthoxy) ethyl acrylate, phenylthioethyl acrylate and / or o- A curable composition containing a monofunctional acrylate such as phenylphenoxyethyl acrylate has been prepared.

However, the curable compositions described in Patent Documents 2 and 3 have a low refractive index, and further improvement is required in order to meet the high demand characteristics in recent years.

Further, Patent Document 2 also describes that a reactive diluent such as arylaryloxyalkyl (meth) acrylate is used for increasing the refractive index. Such reactive diluents may not have sufficient flexibility in the cured product, probably due to the rigid polycyclic aromatic hydrocarbon ring, limiting their use in applications where flexibility is important. Therefore, it has been very difficult to prepare a curable composition capable of achieving high flexibility or toughness (or high durability) in the cured product in a well-balanced manner in addition to high refractive index and handleability.

JP-A-2009-173648 (Claims, Examples, [0033]) International Publication No. 2013/022065 (Claim 13, Example, [0113] [0115]) JP-A-2015-199952 (Claim 8, Example, [0106])

Therefore, an object of the present invention is to provide a curable composition capable of forming a cured product having excellent handleability and a high refractive index without containing a solvent, and a cured product thereof.

Another object of the present invention contains a large amount of (meth) acrylate having a polycyclic aromatic hydrocarbon ring skeleton such as a condensed polycyclic aromatic hydrocarbon ring and a ring-assembled polycyclic aromatic hydrocarbon ring. However, it is an object of the present invention to provide a curable composition having both a high refractive index and flexibility or toughness (or high durability) and a cured product thereof.

As a result of diligent studies to achieve the above problems, the present inventors have obtained a polyfunctional (meth) acrylate having a 9,9-bis condensed polycyclic arylfluorene skeleton and a specific monofunctional (meth) acrylate. When these are combined, they have been found to be excellent in handleability in spite of having a high refractive index, and have completed the present invention.

That is, the curable composition of the present invention has a first polyfunctional (meth) acrylate represented by the following formula (1) and a first monofunctional (meth) represented by the following formula (2). Contains acrylate.

(In the formula, each ring Z is a condensed polycyclic arene ring, each R ¹ and each R ² are substituents, each R ³ is a linear or branched alkylene group, and each R ⁴ is a hydrogen atom. Or a methyl group, each k is an integer of 0 to 4, each m is an integer of 0 or more, and each n is an integer of 1 or more).

(In the formula, R ⁵ is a hydrogen atom or a methyl group, R ⁶ is a linear or branched alkylene group, X is an oxygen atom or a sulfur atom, R ⁷ is an alkyl group, Ar is an allene ring, and p is 1 or more. An integer, q indicates an integer greater than or equal to 0).

In the above formula (1), each ring Z is the same or different fused polycyclic C _10-14 arene ring, each R ² is the same or different alkyl group or aryl group, and each R ³ is C _2-4. A linear or branched alkylene group, each k may be 0, each m may be an integer of about 0 to 2, and each n may be an integer of about 1-10.

The first monofunctional (meth) acrylate is the first condensed polycyclic aromatic monofunctional (meth) acrylate (A) in which Ar is a condensed polycyclic arene ring in the above formula (2). In addition, in the above formula (2), at least one selected from the first ring-assembled polycyclic aromatic monofunctional (meth) acrylate (B) in which Ar is a ring-assembled arene ring may be contained. In particular, it may contain at least the first fused polycyclic aromatic monofunctional (meth) acrylate (A). Further, the first monofunctional (meth) acrylate is a first ring-assembled polycyclic aromatic in addition to the first condensed polycyclic aromatic monofunctional (meth) acrylate (A). The monofunctional (meth) acrylate (B) and the first monocyclic aromatic monofunctional (meth) acrylate (C) in which Ar is a monocyclic arene ring in the above formula (2) are selected. It may contain at least one species.

In the above formula (2), R ⁶ may be a linear or branched C _2-4 alkylene group, X may be an oxygen atom, p may be an integer of about 1 to 4, and q may be 0.

The curable composition may further contain a second polyfunctional (meth) acrylate represented by the following formula (3).

(In the formula, each R ⁸ represents a hydrogen atom, an alkyl group or an aryl group, respectively, and the two R ^8s may be bonded to each other to form a hydrocarbon ring which may have an alkyl group, and each R 8 may be formed. ⁹ is an alkyl group or an aryl group, each R ¹⁰ is a linear or branched alkylene group, each R ¹¹ is a hydrogen atom or a methyl group, r is 0 or 1, and each s is an integer of 0 to 4, respectively. , Each t is an integer of 0 or more, and each u is 0 or 1, respectively).

In the above formula (3), each R ⁸ is a hydrogen atom or a C _1-4 alkyl group, each R ¹⁰ is a linear or branched C _2-4 alkylene group, r is 1, each s is 0, Each t may be an integer of about 0 to 5, respectively.

The ratio of the first monofunctional (meth) acrylate may be about 10 to 120 parts by weight with respect to 100 parts by weight of the first polyfunctional (meth) acrylate. Further, the ratio of the total amount of the first ring-assembled polycyclic aromatic monofunctional (meth) acrylate (B) and the first monocyclic aromatic monofunctional (meth) acrylate (C) is the first. It may be about 1 to 100 parts by weight with respect to 100 parts by weight of the condensed polycyclic aromatic monofunctional (meth) acrylate (A). Further, the ratio of the second polyfunctional (meth) acrylate is 5 to 30 parts by weight based on 100 parts by weight of the total of the first polyfunctional (meth) acrylate and the first monofunctional (meth) acrylate. It may be about a part.

The curable composition may further contain a second monofunctional (meth) acrylate represented by the following formula (4).

(In the formula, Ar ¹ represents an arene ring, R ¹² represents a hydrogen atom or a non-polymerizable substituent, and R ¹ , R ² , R ³ , R ⁴ , k, m and n are the same as in the above formula (1). .)

In the above formula (4), R ¹² may be a group represented by the following formula (5).

(In the formula, R ² , R ³ , m and n are the same as the above formula (1), and Ar ¹ is the same as the above formula (4).)

The ratio of the second monofunctional (meth) acrylate is, for example, 1 to 25 weight by weight with respect to 100 parts by weight of the total amount of the first polyfunctional (meth) acrylate and the second monofunctional (meth) acrylate. It may be about a part.

The curable composition may further contain a polymerization initiator. The present invention also includes a cured product obtained by curing the curable composition.

In the present invention, since a polyfunctional (meth) acrylate having a 9,9-bis condensed polycyclic arylfluorene skeleton and a specific monofunctional (meth) acrylate are combined, it is not only excellent in handleability but also high. A curable composition capable of forming a cured product having a refractive index can be formed. Further, the curable composition contains a large amount of (meth) acrylate having a polycyclic aromatic hydrocarbon ring skeleton such as a condensed polycyclic aromatic hydrocarbon ring and a ring-assembled polycyclic aromatic hydrocarbon ring. Even so, it is possible to form a cured product having both high refractive index and high flexibility (toughness or durability).

[First polyfunctional (meth) acrylate]
The curable composition of the present invention contains a first polyfunctional (meth) acrylate represented by the following formula (1).

(In the formula, each ring Z is a condensed polycyclic arene ring, each R ¹ and each R ² are substituents, each R ³ is a linear or branched alkylene group, and each R ⁴ is a hydrogen atom. Or a methyl group, each k is an integer of 0 to 4, each m is an integer of 0 or more, and each n is an integer of 1 or more).

In the above formula (1), as the fused polycyclic arene ring (condensed polycyclic aromatic hydrocarbon ring) represented by ring Z, for example, a condensed bicyclic arene ring (for example, a condensed dicyclic ring such as a naphthalene ring). A ring-type C _10-16 arene ring), a fused two- to four-cyclic arene ring such as a fused tricyclic arene ring (for example, anthracene ring, phenanthrene ring, etc.) and the like can be mentioned. The two rings Z attached to the 9-position of fluorene may be the same or different, and are usually often the same. Preferred ring Z includes condensed polycyclic C _10-16 arene ring (preferably condensed polycyclic C _10-14 arene ring) such as naphthalene ring and anthracene ring, and naphthalene ring is particularly preferable.

The substitution position of the ring Z bonded to the 9-position of fluorene is not particularly limited. For example, when the ring Z is a naphthalene ring, the group corresponding to the ring Z bonded to the 9-position of fluorene may be a 1-naphthyl group, a 2-naphthyl group, or the like.

In the formula (1), examples of the substituent R ^1, a hydrocarbon group [e.g., an alkyl group (e.g., methyl group, ethyl group, propyl group, isopropyl group, butyl group, like a linear, such as t- butyl group or Branched chain C _1-6 alkyl group, etc.), aryl group (eg, C _6-10 aryl group such as phenyl group), etc.], cyano group, halogen atom (eg, fluorine atom, chlorine atom, bromine atom, etc.) And so on. Among these groups ^{R 1,} an alkyl group (e.g., a linear or branched _{C 1-4} alkyl group (particularly, _{C 1-3} alkyl group such as methyl group)), a cyano group or a halogen atom, Alkyl groups are particularly preferred.

The substitution number k of the group R ¹ is an integer of 0 to 4, for example, an integer of about 0 to 3, preferably an integer of about 0 to 2, more preferably 0 or 1, and particularly 0. The number of substitutions k may be the same or different from each other. The type of radicals R ¹ to be substituted with two benzene rings form a fluorene skeleton may be the same or different from each other, when k is 2 or more, two or more substituted on the same benzene ring R ^{The types of 1} may be the same or different from each other. The substitution position of the group ^{R 1} is not particularly limited, for example, a fluorene ring 2-position or 7-position (2-position, 3-position and 7-positions, etc.).

In the formula (1), examples of the substituent R ^2, a halogen atom (e.g., fluorine atom, chlorine atom, bromine atom, iodine atom), a hydrocarbon group {e.g., an alkyl group (a methyl group, an ethyl group, a propyl group, _{A linear or branched C 1-10} alkyl group such as an isopropyl group, an n-butyl group, an s-butyl group, a t-butyl group, preferably a linear or branched C _1-6 alkyl group, and further. Preferred is a linear or branched C _1-4 alkyl group); cycloalkyl group (eg, C _5-10 cycloalkyl group such as cyclopentyl group, cyclohexyl group); aryl group [eg, phenyl group, alkyl phenyl group (e.g., methylphenyl group (tolyl group), a dimethylphenyl group (xylyl), etc.), a biphenylyl group, a C _6-12 aryl group such as a naphthyl group]; aralkyl groups (e.g., benzyl group, phenethyl group C _6-10 aryl-C _1-4 alkyl groups, etc.}, alkoxy groups (eg, methoxy group, ethoxy group, propoxy group, n-butoxy group, isobutoxy group, s-butoxy group, t-butoxy group, etc.) Linear or branched C _1-10 alkoxy groups, cycloalkyloxy groups (eg, C _5-10 cycloalkyloxy groups such as cyclohexyloxy groups), aryloxy groups (eg, phenoxy groups, etc.) C _6-10 aryloxy group, etc.), aralkyloxy group (eg, C _6-10 aryl-C _1-4 alkyloxy group, such as benzyloxy group), alkylthio group (eg, methylthio group, ethylthio group, propylthio group, etc.) , N-butylthio group, C _1-10 alkylthio group such as t-butylthio group), cycloalkylthio group (for example, C _5-10 cycloalkylthio group such as cyclohexylthio group), arylthio group (for example, thiophenoxy group, etc.) C _6-10 arylthio group, etc.), aralkylthio group (eg, C _6-10 aryl-C _1-4 alkylthio group, such as benzylthio group), acyl group (eg, C _1-6 acyl group, such as acetyl group). , Nitro group, cyano group, substituted amino group [eg, dialkylamino group (eg, diC _1-4 alkylamino group such as dimethylamino group), bis (alkylcarbonyl) amino group (eg, diacetylamino group) Bis (C _1-4 alkyl-carbonyl) amino group, etc.), etc.] etc. are examples. it can.

Of these groups R ^2, typically, a halogen atom, a hydrocarbon group (an alkyl group, a cycloalkyl group, an aryl group, an aralkyl group), an alkoxy group, an acyl group, a nitro group, a cyano group, a substituted amino group such as Can be mentioned. Preferred groups R ² include alkyl groups (such as linear or branched C _1-6 alkyl groups such as methyl groups), aryl groups (such as C _6-14 aryl groups such as phenyl groups), and alkoxy groups (methoxy). Linear or branched C _1-4 alkyl groups such as groups), in particular alkyl groups (particularly linear or branched C _1-4 alkyl groups such as methyl groups), aryl groups (phenyl groups). C _6-10 aryl group, etc.).

The substitution number m of the group R ² may be an integer of 0 or more, and can be appropriately selected depending on the type of the ring Z. For example, it may be an integer of about 0 to 8, preferably an integer of about 0 to 4 (for example, 0 to 3), more preferably an integer of about 0 to 2 (for example, 0 or 1), particularly 0. There may be. The number of substitutions m may be the same as or different from each other. ^{Further, the types of the groups R 2} to be substituted with different rings Z may be the same or different from each other, and when the number of substitutions m is 2 or more, the types of ^{the two or more groups R 2 to be substituted with the same ring Z are} , May be the same or different from each other. The substitution position of the group R ² is not particularly limited, and the group described later [-(OR ³ ) _n- OC (= O) -CR ⁴ = CH ₂ ] (may be simply referred to as a (meth) acryloyl group-containing group). It suffices to replace with a position other than the replacement position of.

In the formula (1), the group R ^3, includes straight chain or branched chain alkylene group. _{Examples of the linear alkylene group include a linear C 2-6} alkylene group (preferably a linear C _2-4 alkylene group, more preferably a linear C) such as an ethylene group, a trimethylene group, and a tetramethylene group. _{A 2-3} alkylene group (particularly an ethylene group) can be exemplified, and examples of the branched alkylene group include a branched C _3-6 alkylene such as a propylene group, a 1,2-butandyl group and a 1,3-butanjiyl group. Examples thereof include a group (preferably a branched C _3-4 alkylene group, particularly a propylene group). Among these groups R ^3, preferably a straight chain or branched chain C _2-6 alkylene group (e.g., a straight-chain or branched-chain C _2-4 alkylene group), more preferably a straight-chain or branched It may be a chain C _2-3 alkylene group (particularly an ethylene group). Note that in each of the (meth) acryloyl group-containing group substituted to different ring Z, the type of radicals R ³ may be the same or different from each other.

The number of repetitions n of the oxyalkylene group (OR ³ ) can be selected from a range of 1 or more integers (for example, an integer of about 1 to 20), and is, for example, an integer of about 1 to 15 (for example, 1 to 10), preferably. May be an integer of about 1 to 8 (for example, 2 to 7), more preferably an integer of about 1 to 6 (for example, 3 to 5), particularly an integer of about 1 to 4 (particularly 1). In applications where handleability, scratch resistance (or flexibility), etc. are important, n may be, for example, an integer of about 5 to 10 (for example, 6 to 9), preferably an integer of about 7 to 8. .. If n is too large, the refractive index may decrease. Further, each n may be the same as or different from each other. (Meth) In acryloyl group-containing group, if the number of repetitions n is 2 or more, two or more kinds of groups R ^3, which may be different from each other, but are preferably the same.

In the present specification, unless otherwise specified, the "repetition number of oxyalkylene groups" (and the "total number of oxyalkylene groups (total addition number)" described later) means oxyalkylene in one molecule of the compound. It is used to include both the number of groups (integer) and the average value of the number of oxyalkylene groups in the molecular assembly of the compound (arithmetic mean value or arithmetic mean value) [that is, the average number of added moles]. Therefore, the repetition number n may be an average value (arithmetic mean or arithmetic mean) in the molecular assembly of the compound represented by the formula (1), and the range may be a range of the integers and a preferred embodiment. It may be about the same including.

Further, in the formula (1), the total number of the two repetition numbers n means the total number (total addition number) of the oxyalkylene groups in one molecule of the compound represented by the formula (1), and is simply 2n. In some cases. 2n can be selected from a range of integers of, for example, about 0 to 30, for example, an integer of about 1 to 25 (for example, 2 to 20), preferably an integer of about 3 to 18 (for example, 4 to 16), and further. It may be preferably an integer of about 5 to 14 (for example, 6 to 12), particularly an integer of about 7 to 11 (for example, 8 to 10), and usually an integer of about 1 to 2 (particularly 1). There may be. In applications where handleability, scratch resistance (or flexibility), etc. are important, the 2n is, for example, an integer of about 10 to 20 (for example, 12 to 18), preferably 13 to 17 (for example, 14 to 16). It may be an integer of degree. Further, 2n may be an integer as described above, but may be the average number of moles added in the molecular assembly of the compound represented by the formula (1), and the range thereof is, for example, the integer. It may be about the same including the range and the preferred embodiment. If the value of 2n is too small, the viscosity of the curable composition tends to increase, and the handleability may decrease. However, in the present invention, even if a large amount of the first monofunctional (meth) acrylate, which is a reactive diluent, is mixed, a high refractive index can be maintained, so that even if the value of 2n is relatively small, it is effective. Handleability can be improved (viscosity can be reduced). If the value of 2n is too large, the 9,9-bis-condensed polycyclic arylfluorene skeleton content (for example, the number of moles contained) per unit amount (for example, unit weight) of the cured product decreases. Derived excellent properties such as high refractive index and high heat resistance may be deteriorated. 2n can be measured by a conventional method. For example, in the preparation of the compound represented by the above formula (1), a hydroxy compound having a 9,9-bis condensed polycyclic arylfluorene skeleton as a raw material. A method of calculating as an arithmetic mean or arithmetic mean value from the ratio of the amount of alkylene oxide (alkylene carbonate or haloalkanol) consumed in the reaction (for example, the method according to International Publication No. 2013/022065). Etc.) can be measured.

In the above formula (1), the group R ⁴ may be either a hydrogen atom or a methyl group, but is preferably a hydrogen atom. Two radicals R ⁴ may be different from each other, usually the same.

The substitution position of the (meth) acryloyl group-containing group is not particularly limited and can be substituted at an appropriate position of the ring Z. For example, when the ring Z is a naphthalene ring, any of the 5-8-positions of the naphthyl group. In many cases, the 9-position of fluorene is replaced with the 1-position or 2-position of the naphthalene ring (replaced in the relationship of 1-naphthyl or 2-naphthyl), and this substitution position is used. On the other hand, the (meth) acryloyl group-containing group is often substituted in relations such as the 1,5-position and the 2,6-position (particularly the relation of the 2,6-position).

As the first polyfunctional (meth) acrylate represented by the above formula (1), typically, fluorenes in which each ring Z is a naphthalene ring, 9,9-bis [(meth) acryloyloxy (poly). ) Alkoxynaphthyl] Fluorenes and the like can be mentioned. The fluorenes are used in the above formula (1) to mean that they also include a compound having k and / or m of 1 or more. Further, in the present specification and claims, "(poly) alkoxy" is used to mean including both an alkoxy group and a polyalkoxy group.

As the 9,9-bis [(meth) acryloyloxy (poly) alkoxynaphthyl] fluorenes, in the above formula (1), each ring Z is a naphthalene ring and each n is 1 to 10 (preferably 1 to 6). Certain compounds, such as 9,9-bis [(meth) acryloyloxy (poly) alkoxynaphthyl] fluorene {eg, 9,9-bis [6- (2- (meth) acryloyloxyethoxy) -2-naphthyl] fluorene , 9,9-bis [6- (2- (meth) acryloyloxypropoxy) -2-naphthyl] fluorene, 9,9-bis [5- (2- (meth) acryloyloxyethoxy) -1-naphthyl] fluorene , 9,9-bis [5- (2- (meth) acryloyloxypropoxy) -1-naphthyl] fluorene, 9,9-bis [6- (2- (2- (meth) acryloyloxyethoxy) ethoxy)- 2-naphthyl] fluorene, 9,9-bis [6-(2- (2- (meth) acryloyloxypropoxy) propoxy) -2-naphthyl] fluorene and other 9,9-bis [(meth) acryloyloxy (mono) ~ Deca) C _2-4 alkoxynaphthyl] fluorene, etc.} and the like.

These first polyfunctional (meth) acrylates can also be used alone or in combination of two or more. Preferred first polyfunctional (meth) acrylates include 9,9-bis [(meth) acryloyl] such as 9,9-bis [6-(2- (meth) acryloyloxyethoxy) -2-naphthyl] fluorene. Oxy (mono to hepta) C _2-4 alkoxynaphthyl] fluorene and the like can be mentioned. In addition, these first polyfunctional (meth) acrylates may be commercially available products, or may be prepared by a conventional method (for example, the method described in International Publication No. 2013/022065).

[First monofunctional (meth) acrylate]
The curable composition of the present invention retains the high refractive index of the first polyfunctional (meth) acrylate by containing the first monofunctional (meth) acrylate represented by the following formula (2). At the same time, the handleability can be effectively improved (or the viscosity can be reduced), and for example, it can be suitably used for applications such as a prism sheet.

(In the formula, R ⁵ is a hydrogen atom or a methyl group, R ⁶ is a linear or branched alkylene group, X is an oxygen atom or a sulfur atom, R ⁷ is an alkyl group, Ar is an allene ring, and p is 1 or more. An integer, q indicates an integer greater than or equal to 0).

In the formula (2), the radicals R ⁵ is a hydrogen atom or a methyl group, preferably a hydrogen atom.

Further, the group R ⁶ is a linear or branched alkylene group, and may be the same as the alkylene group described in the section ^{of R 3 of the above formula (1), including a preferable embodiment.} The number of repetitions p of the group (R ⁶ O) can be selected from a range of integers of, for example, about 1 to 30 (for example, 2 to 25), and for example, an integer of about 1 to 20 (for example, 3 to 15), preferably. Is an integer of about 1 to 12 (for example, 4 to 10), more preferably an integer of about 1 to 8 (for example, 5 to 6), particularly an integer of about 1 to 4 (for example, an integer of about 1 to 3, in particular. It may be 1). The number of repetitions p may be an average value (average number of added moles), and the range may be about the same as the range of the above integers, including preferred embodiments. If the number of repetitions p is too large, the refractive index of the cured product may decrease. In the case p is 2 or more, kinds of two or more groups R ^6, which may be different from each other, usually, it is often the same.

In the above formula (2), X is an oxygen atom or a sulfur atom, and in applications where high light resistance in the cured product is important, it is preferably an oxygen atom, and in applications where high refractive index and flexibility of the cured product are important. Then, it is preferable that it is a sulfur atom. When used as an optical material, it is usually an oxygen atom.

In the above formula (2), the allene ring (aromatic hydrocarbon ring) represented by the ring Ar is a monocyclic allene ring (monocyclic aromatic hydrocarbon ring) such as a benzene ring; a polycyclic allene ring. {e.g., fused polycyclic arene ring (condensed polycyclic aromatic hydrocarbon ring) [e.g., fused bicyclic hydrocarbon ring (e.g., indene, C _8-20 fused bicyclic hydrocarbon ring such as naphthalene, C _10-14 fused bicyclic hydrocarbon rings), fused tricyclic hydrocarbon rings (eg, anthracene, phenanthrene, etc.) and other fused bi to tetracyclic hydrocarbon rings]; ring-assembled arene rings (rings) Aggregate hydrocarbon ring) [biphenyl ring, terphenyl ring, binaphthyl ring, etc., or ter C _6-10 allene ring, etc.]} and the like. _{Preferred ring Ar includes C 6-14} arene rings such as benzene ring, naphthalene ring and biphenyl ring, and from the viewpoint of high refractive index, C _8-12 polycyclic arene ring such as naphthalene ring and biphenyl ring. Is particularly preferable, and from the viewpoint of high handleability, a benzene ring is particularly preferable.

In the above formula (2), ^{the bonding position of the group [-X- (R 6} O) _p- CO-CR ⁵ = CH ₂ ] with respect to the ring Ar is not particularly limited, and for example, when the ring Ar is a benzene ring. May be bonded to any of the 1- to 6-positions, and when the ring Ar is a naphthalene ring, it is bonded to any of the 1-position and 2-position. However, it is preferable that it is bonded to the 2-position. When the ring Ar is a biphenyl ring, any of the 2-position, 3-position, and 4-position (or 2'-position, 3'-position, and 4'-position) It may be bound to the 2-position (or 2'-position), but it is preferable to be bound to the 2-position (or 2'-position).

In the above formula (2), the group R ⁷ includes, for example, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, an s-butyl group, a t-butyl group, a pentyl group, and the like. _{Linear or branched C 1-12} alkyl groups such as neopentyl group, hexyl group, heptyl group, octyl group, 2-ethylhexyl group, nonyl group, decyl group, preferably linear or branched C _{1- 9} Alkyl groups, more preferably linear or branched C _1-6 alkyl groups (eg, linear or branched C _1-4 alkyl groups) and the like can be mentioned. The substitution number q of the group R ⁷ may be an integer of 0 or more and can be selected according to the type of the ring Ar. For example, an integer of about 0 to 4, preferably an integer of about 0 to 2, more preferably 0 or It may be 1, especially 0. When q is 2 or more, ^{the types of the groups R 7 having} 2 or more may be the same or different from each other. Further, ^{the substitution position of the group R 7} is not particularly limited, and it may be substituted at a position other than the substitution position of ^{the group [-X- (R 6} O) _p- CO-CR ⁵ = CH _2].

The first monofunctional (meth) acrylate is, for example, in the above formula (2), the first fused polycyclic aromatic monofunctional (meth) acrylate (A) in which the ring Ar is a condensed polycyclic arene ring. ) [Sometimes referred to simply as the diluent component (A)]; First ring-assembled polycyclic aromatic monofunctional (meth) acrylate (B) in which the ring Ar is a ring-assembled arene ring [Simply, a diluent Ingredient (B)]; First monocyclic aromatic monofunctional (meth) acrylate (C) in which the ring Ar is a monocyclic arene ring [Sometimes referred to simply as the diluent component (C). There is] can be roughly divided.

As a typical diluent component (A), for example, (A1) in the above formula (2), X is an oxygen atom, q is 0, and ring Ar is a condensed polycyclic allene ring. Alkoxy (meth) acrylates {For example, (A1-1) In the above formula (2), a condensed polycyclic aryloxyalkyl (meth) acrylate in which p is 1, [for example, 2- (2-naphthoxy) ethyl (meth). ) Alkoxy, 2- (1-naphthoxy) ethyl (meth) acrylate, condensed polycyclic C _10-14 aryloxy C _2-4 alkyl (meth) acrylate, etc., 2- (2-naphthoxy) propyl (meth) acrylate, etc. ]; (A1-2) In the above formula (2), a condensed polycyclic aryloxy (poly) alkoxyalkyl (meth) acrylate in which p is 2 or more (for example, about 2 to 20, preferably about 2 to 15) [ For example, 2- (2- (2-naphthoxy) ethoxy) ethyl (meth) acrylate, 2- (2- (1-naphthoxy) ethoxy) ethyl (meth) acrylate, 2- [2- (2-naphthoxy) propoxy]. _{Condensation polycyclic C 10-14} aryloxy (mono to nonadeca) C _2-4 alkoxy C _2-4 alkyl (meth) acrylate such as propyl (meth) acrylate] etc.}; (A2) In the above formula (2) , X is a sulfur atom, q is 0, and ring Ar is a condensed polycyclic allene ring. Condensed polycyclic arylthioalkyl (meth) acrylates [for example, exemplified in (A1-1) and (A1-2) above. Corresponding to the compound, the compound in which X in the formula (2) is a sulfur atom, etc.] and the like can be mentioned.

These diluent components (A) can be used alone or in combination of two or more. Among these diluent components (A), (A1) condensed polycyclic aryloxyalkyl (meth) acrylates such as (A1-1) condensed polycyclic aryloxyalkyl (meth) acrylates, especially 2- _{Condensation polycyclic C 10-14} aryloxy C _2-3 alkyl (meth) acrylates such as (2-naphthoxy) ethyl (meth) acrylates are preferred.

As a typical diluent component (B), for example, (B1) in the above formula (2), X is an oxygen atom, q is 0, and ring Ar is a ring-aggregated allene ring. Alkoxy {For example, (B1-1) In the above formula (2), a ring-assembled aryloxyalkyl (meth) acrylate in which p is 1, [for example, 2- (o-phenylphenoxy) ethyl (meth) acrylate, 2- Ring assembly of (m-phenylphenoxy) ethyl (meth) acrylate, 2- (p-phenylphenoxy) ethyl (meth) acrylate, 2- (o-phenylphenoxy) propyl (meth) acrylate, etc. C _12-20 aryloxy C _2-4 Alkoxy (meth) acrylate, etc.]; (B1-2) In the above formula (2), ring-assembled aryloxy (poly) having p of 2 or more (for example, about 2 to 20, preferably about 2 to 15). Alkoxyalkyl (meth) acrylate [eg, 2- (2- (o-phenylphenoxy) ethoxy) ethyl (meth) acrylate, 2- (2- (m-phenylphenoxy) ethoxy) ethyl (meth) acrylate, 2-( Ring assembly of 2- (p-phenylphenoxy) ethoxy) ethyl (meth) acrylate, 2- (2- (o-phenylphenoxy) propoxy) propyl (meth) acrylate, etc. C _12-20 aryloxy (mono to nonadeca) C _2-4, such as alkoxy _{C 2-4} alkyl (meth) acrylate], etc.}; (B2) in formula (2), X is a sulfur atom, q is 0, ring assembly arylthio ring Ar is a ring set arene ring Alkoxy (meth) acrylates [for example, a compound in which X is a sulfur atom in the formula (2) corresponding to the compounds exemplified in (B1-1) and (B1-2) above] and the like can be mentioned.

These diluent components (B) can also be used alone or in combination of two or more. Among these diluent components (B), (B1) fused polycyclic aryloxyalkyl (meth) acrylates such as (B1-1) ring-assembled aryloxyalkyl (meth) acrylates, especially 2- (o). _{Ring assembly C 12-20} aryloxy C _2-3 alkyl (meth) acrylate such as −phenylphenoxy) ethyl (meth) acrylate is preferred.

Typical diluent components (C) include, for example, (C1) phenoxyalkyl (meth) acrylates in which X is an oxygen atom, q is 0, and ring Ar is a monocyclic allene ring in the above formula (2). {For example, (C1-1) In the above formula (2), phenoxyalkyl (meth) acrylate in which p is 1, [for example, phenoxy C such as 2-phenoxyethyl (meth) acrylate, 2-phenoxypropyl (meth) acrylate. _2-4 Alkoxy (meth) acrylate, etc.]; (C1-2) In the above formula (2), phenoxy (poly) alkoxyalkyl (for example, about 2 to 20, preferably about 2 to 15) having p of 2 or more (for example, about 2 to 15). _{Meta) acrylate [eg, phenoxy (mono to nonadeca) C 2-4} alkoxy C _2-4 such as 2- (2-phenoxyethoxy) ethyl (meth) acrylate, 2- (2-phenoxypropoxy) propyl (meth) acrylate. Alkoxy (meth) acrylate, etc.] etc.}; (C2) In the above formula (2), phenylthioalkyl (meth) acrylates in which X is a sulfur atom, q is 0, and ring Ar is a monocyclic allene ring {for example, In formula (C2-1) (2), phenylthioalkyl (meth) acrylate having p of 1 [for example, phenylthio such as 2- (phenylthio) ethyl (meth) acrylate and 2- (phenylthio) propyl (meth) acrylate. C _2-4 alkyl (meth) acrylate, etc.]; (C2-2) In the above formula (2), phenylthio (poly) alkoxyalkyl having p of 2 or more (for example, about 2 to 20, preferably about 2 to 15). _{(Meta) acrylate [For example, phenylthio (mono to nonadeca) C 2-4} such as 2- (2- (phenylthio) ethoxy) ethyl (meth) acrylate, 2- (2- (phenylthio) propoxy) propyl (meth) acrylate. Alkoxy C _2-4 alkyl (meth) acrylate, etc.] etc.} and the like.

These diluent components (C) can be used alone or in combination of two or more. Among these diluent components (C), (C1-1) phenoxyalkyl (meth) acrylate, (C2-1) phenylthioalkyl (meth) acrylate and the like are preferable, and 2-phenoxyethyl (meth) acrylate among them. _{Phenoxy C 2-3} alkyl (meth) acrylate such as phenoxy C _{2-3 alkyl (meth) acrylate, phenylthio C 2-3} alkyl (meth) acrylate such as 2- (phenylthio) ethyl (meth) acrylate and the like are preferable.

As the compound represented by the above formula (2), a commercially available product may be used, and a known method, for example, an alkylene oxide (alkylene carbonate) of phenols (or thiophenols) corresponding to ring Ar can be used. Alternatively, the haloalkanol adduct is added in the presence of an esterification catalyst (p-toluenesulfonic acid, sulfuric acid, etc.), a polymerization inhibitor (4-methoxyphenol, hydroquinone, etc.), and optionally a solvent (toluene, etc.). Meta) It can be prepared by a method of reacting with acrylic acid.

These first monofunctional (meth) acrylates can also be used alone or in combination of two or more. Among these first monofunctional (meth) acrylates, the diluent component (C) is preferably contained from the viewpoint of handleability, and the diluent component (A) and the diluent are diluted from the viewpoint of high refractive index. It is preferable to contain at least one selected from the agent component (B) [particularly, at least the diluent component (A)].

In the curable composition of the present invention, not only the first polyfunctional (meth) acrylate but also a rigid condensed polycyclic or ring-aggregated polycyclic such as the diluent component (A) and / or the diluent component (B). Even if a large amount of (meth) acrylate having a cyclic aromatic skeleton is contained, the hardness of the obtained cured product is surprisingly low, so that both high refractive index and flexibility can be achieved at the same time. Moreover, the diluent component (A) and the diluent component (B) are curable compositions, probably because they easily weaken the π-π interaction that causes the high crystallinity of the first polyfunctional (meth) acrylate. The handleability of the product can also be improved.

The ratio of the total amount of the diluent component (A) and the diluent component (B) is, for example, 10% by weight or more (for example, 30 to 100% by weight) with respect to the entire first monofunctional (meth) acrylate. It may be preferably about 50% by weight (for example, 70 to 99% by weight), more preferably about 80% by weight or more (for example, 90 to 95% by weight), or substantially about 100% by weight. Good. If the ratio of the total amount of the diluent components (A) and (B) is too small, the refractive index may not be improved.

When both the diluent component (A) and the diluent component (B) are included, the ratio of the diluent component (B) is, for example, about 1 to 100 parts by weight with respect to 100 parts by weight of the diluent component (A). Can be selected from the range of, for example, 5 to 80 parts by weight (for example, 10 to 60 parts by weight), preferably 15 to 50 parts by weight (for example, 20 to 45 parts by weight), and more preferably 25 to 40 parts by weight (for example). , 30 to 35 parts by weight). If the proportion of the diluent component (B) is too large, the hardness may not be sufficiently reduced.

From the viewpoint of easily achieving both a high refractive index and handleability, the first monofunctional (meth) acrylate preferably contains at least the diluent component (A). In an embodiment in which the first monofunctional (meth) acrylate contains a diluent component (A), at least one selected from the diluent component (B) and the diluent component (C) [particularly, at least a diluent]. Agent component (B)] may be included. Surprisingly, when the diluent component (A) is combined with the diluent components (B) and / or (C), the curability with the same composition ratio is compared with the embodiment in which each diluent component is used alone. In some cases, the hardness of the cured product obtained from the composition can be reduced (flexibility is improved). The same composition ratio means that the ratio of the first polyfunctional (meth) acrylate and the first monofunctional (meth) acrylate is equal.

The ratio of the total amount of the diluent component (B) and the diluent component (C) can be selected from the range of, for example, about 1 to 100 parts by weight with respect to 100 parts by weight of the diluent component (A), for example, 5 to 100 parts by weight. It is about 80 parts by weight (for example, 10 to 60 parts by weight), preferably about 15 to 50 parts by weight (for example, 20 to 45 parts by weight), and more preferably about 25 to 40 parts by weight (for example, 30 to 35 parts by weight). You may. If the ratio of the total amount of the diluent components (B) and (C) is too large, the hardness may not be sufficiently reduced.

When the first monofunctional (meth) acrylate contains both the diluent component (B) and the diluent component (C), the ratio of the diluent component (C) is 100% by weight of the diluent component (B). It can be selected from the range of, for example, about 1 to 500 parts by weight, and for example, 10 to 450 parts by weight (for example, 30 to 400 parts by weight), preferably 50 to 380 parts by weight (for example, 70 to 350 parts by weight). Parts), more preferably about 80 to 330 parts by weight (for example, 90 to 320 parts by weight). If the proportion of the diluent component (C) is too large, the refractive index may decrease.

The ratio of the first monofunctional (meth) acrylate is, for example, 10% by weight or more (for example, 30 to 100% by weight), preferably 10% by weight or more, based on the total monofunctional (meth) acrylate contained in the curable composition. May be about 50% by weight or more (for example, 70 to 99% by weight), more preferably 90% by weight or more (for example, 90 to 95% by weight), or substantially 100% by weight.

The ratio of the first monofunctional (meth) acrylate is, for example, about 1 to 300 parts by weight (for example, 10 to 200 parts by weight) with respect to 100 parts by weight of the first polyfunctional (meth) acrylate. Can be selected from the range of, for example, 15 to 150 parts by weight (for example, 20 to 120 parts by weight), preferably 25 to 100 parts by weight (for example, 30 to 90 parts by weight), and more preferably 35 to 80 parts by weight (for example). , 40 to 70 parts by weight), usually about 45 to 110 parts by weight (for example, 50 to 100 parts by weight), preferably about 60 to 90 parts by weight (for example, 70 to 80 parts by weight). You may. If the proportion of monofunctional (meth) acrylate is too high, the refractive index of the cured product may decrease. However, the curable composition of the present invention can effectively suppress a decrease in the refractive index even if it contains a relatively large amount of the first monofunctional (meth) acrylate as a reactive diluent. Further, if the proportion of the first monofunctional (meth) acrylate is too small, the handleability may not be improved (viscosity may be reduced).

[Second polyfunctional (meth) acrylate]
The curable composition of the present invention may further contain a compound represented by the following formula (3) as the second polyfunctional (meth) acrylate. By containing such a compound, it is possible to impart flexibility (toughness or durability) while suppressing a decrease in the refractive index of the cured product, and it can be suitably used for applications such as coating agents (hard coating agents, etc.). ..

(In the formula, each R ⁸ represents a hydrogen atom, an alkyl group or an aryl group, respectively, and the two R ^8s may be bonded to each other to form a hydrocarbon ring which may have an alkyl group, and each R 8 may be formed. ⁹ is an alkyl group or an aryl group, each R ¹⁰ is a linear or branched alkylene group, each R ¹¹ is a hydrogen atom or a methyl group, r is 0 or 1, and each s is an integer of 0 to 4, respectively. , Each t is an integer of 0 or more, and each u is 0 or 1, respectively).

In the formula (3), the alkyl group of the group R ^8, for example, a methyl group, an ethyl group, an isopropyl group, n- butyl group, isobutyl group, s- butyl group, a linear, such as t- butyl group or It _{may be a branched C 1-6} alkyl group, preferably a linear or branched C _1-4 alkyl group (particularly a methyl group). The aryl group of the group R ⁸ may be, for example, a C _6-10 aryl group (particularly a phenyl group) such as a phenyl group or a naphthyl group. The type of each group R ⁸ may be the same or different from each other. As the two radicals R ⁸ are bonded may hydrocarbon ring which may be formed by one another, a cyclopentane ring, it may be a C _5-8 cycloalkane ring such as cyclohexane ring. The hydrocarbon ring substituted with an alkyl group optionally to, for example, an alkyl group exemplified in the paragraph of the above-described alkyl group radicals R ^8. These may be similar, including preferred embodiments. The number of substitutions and the substitution position of the alkyl group to be substituted on the hydrocarbon ring are not particularly limited. The number of substitutions may be, for example, an integer of 0 to 3, preferably an integer of 0 to 2, more preferably 0 or 1, and particularly 0. When the hydrocarbon ring is a cyclohexane ring, the substitution position may be substituted at any of the 3-position to 5-position, for example. The number of substitutions r may be either 0 or 1, but it is usually 1.

Examples of the group R ⁹ include the alkyl group and the aryl group exemplified in the section of the group R ^{8, and the same may be used including preferred embodiments.} The substitution number s of the group R ⁹ is an integer of 0 to 4, and may be, for example, an integer of 0 to 3, preferably an integer of 0 to 2, more preferably 0 or 1, and particularly 0. ^{Further, the types of the groups R 9} to be substituted with different benzene rings may be the same or different from each other, and when s is 2 or more, the types of ^{the two or more groups R 9 to be substituted with the same benzene ring may be the same or different from each other.} It may be the same or different. The substitution position of R ⁹ is not particularly limited, and may be substituted at any position (2-position, 3-position, etc.) of the benzene ring.

The linear or branched alkylene group represented by group R ^10, such as exemplified straight chain or branched chain alkylene group in terms of the radicals R ³ in the formula (1), with the preferred embodiment also It is the same including. Note that different groups _{^{[-O- (R 10 O) t}} - (CH 2 CH (OH) CH 2) u -OC (= O) -CR 11 = CH 2] types of groups ^{R 10} in the same or mutually It may be different. The number of repetitions t of the oxyalkylene group (OR ¹⁰ ) can be selected from, for example, an integer range of about 0 to 30, for example, an integer of about 0 to 20 (for example, 1 to 10), preferably 0. It may be an integer of about 8 (for example, 1 to 6), more preferably an integer of about 0 to 4 (for example, 1 to 3), and particularly an integer of about 0 to 2 (for example, 1 to 2). The number of repetitions t may be an average value (average number of added moles), and the range may be about the same as the range of the above integers, including preferred embodiments. In the case t is 2 or more, two or more kinds of groups R ^10, which may be different from each other, usually, it is often the same.

The total number of each t [the total number of oxyalkylene groups (total number of additions), may be simply 2t. ] Is, for example, an integer of about 0 to 30 (for example, 2 to 20), preferably an integer of about 0 to 16 (for example, 2 to 10), and more preferably about 0 to 8 (for example, 2 to 6). It may be an integer, particularly an integer of about 0 to 4 (for example, 2 to 4). 2t may be an average value (average number of added moles), and the range may be about the same as the range of the integer, including a preferred embodiment. If 2t (or the number of repetitions t) is too large, the refractive index of the cured product may decrease.

u may be either 0 or 1, and is preferably 0 from the viewpoint of handleability and flexibility. Each u may be different from each other, but usually they are often the same.

The group R ¹¹ may be either a hydrogen atom or a methyl group, but is preferably a hydrogen atom. The groups R ¹¹ may be the same or different from each other.

Among the second polyfunctional (meth) acrylates represented by the formula (3), typically (d) compounds in which u is 0 in the formula (3), that is, bi or bisphenols. (Or its alkylene oxide adduct) di (meth) acrylate; (e) In the above formula (3), the compound in which u is 1, that is, the di [epoxy] of bi or bisphenol (or its alkylene oxide adduct). (Meta) acrylate] and the like.

In the compounds (d) and (e), specific bi or bisphenols include, for example, (i) biphenols such as p, p'-bisphenol in which r corresponds to 0 in the above formula (3); (Ii) In the above formula (3), ^{bisphenols in which r is 1, each group R 8} is a hydrogen atom or an alkyl group, and each s is 0, for example, bis (4-hydroxyphenyl) methane (bisphenol F). , 1,1-bis (4-hydroxyphenyl) ethane (bisphenol AD), 2,2-bis (4-hydroxyphenyl) propane (bisphenol A), 1,1-bis (4-hydroxyphenyl) butane, 2, Bis such as 2-bis (4-hydroxyphenyl) butane (bisphenol B), 2,2-bis (4-hydroxyphenyl) -3-methylbutane, 2,2-bis (4-hydroxy-3-phenylphenyl) propane (Hydroxyphenyl) C _1-6 alkane, etc .; (iii) In the above formula (3), r is 1, each group R ⁸ is a hydrogen atom or an alkyl group, each s is 1, and each group R ⁹ is an alkyl group. Corresponding bisphenols such as 2,2-bis (4-hydroxy-3-methylphenyl) propane (bisphenol C), 2,2-bis (4-hydroxy-3-isopropylphenyl) propane (bisphenol G) and the like. Bis (C _1-6 alkyl-hydroxyphenyl) C _1-6 alcan, etc .; (iv) In the above formula (3), r is 1, ^{at least one of each group R 8} is an aryl group, and each s is 0. Corresponding bisphenols, such as 1,1-bis (4-hydroxyphenyl) -1-phenylethane (bisphenol AP), bis (4-hydroxyphenyl) -diphenylmethane (bisphenol BP) and other bis (hydroxyphenyl)-( Mono or di) C _6-10 aryl-C _1-6 alcan, etc .; (v) In the above formula (3), one or two ^{groups R 8} may be bonded to each other to have an alkyl group. Bisphenols that form a hydrocarbon ring and each s corresponds to 0, such as 1,1-bis (4-hydroxyphenyl) cyclopentane, 1,1-bis (4-hydroxyphenyl) cyclohexane (bisphenol Z), _{Examples thereof include bis (hydroxyphenyl) C 4-10} cycloalkane such as 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane (bisphenol TMC). To.

In the compounds (d) and (e), specific alkylene oxides include alkylene oxides ^{corresponding to the oxyalkylene group (R 10} _{O) in the formula (3), for example, C 2-} such as ethylene oxide and propylene oxide. _6- alkylene oxide, preferably C _2-3 alkylene oxide, more preferably C _2-3 alkylene oxide (particularly ethylene oxide) and the like can be mentioned. Further, the addition number (or average addition mole number) of the alkylene oxide corresponds to the range of the total number of oxyalkylene groups of 2t, and may be the same including the preferable embodiment.

These second polyfunctional (meth) acrylates can also be used alone or in combination of two or more. _{Among these second polyfunctional (meth) acrylates, C 2-4 with respect to 1 mol of bis (hydroxyphenyl) C 1-6} alkane (or bisphenols thereof) such as bisphenol F, bisphenol AD, and bisphenol A. Di (meth) acrylate or di [epoxy (meth) acrylate] of an adduct to which 2 to 10 mol of alkylene oxide is added is preferable, and among them, bis (hydroxyphenyl) C _1-3 alkane (or its) such as bisphenol A is preferable. Di (meth) acrylate or di [epoxy (meth) acrylate] of an adduct in which 2 to 6 mol of _{C 2-3} alkylene oxide (particularly ethylene oxide) is added to 1 mol of bisphenols is particularly preferable. As these second polyfunctional (meth) acrylates, commercially available products and the like may be used.

The ratio of the second polyfunctional (meth) acrylate is, for example, 0. It can be selected from a range of about 1 to 100 parts by weight (for example, 0.5 to 80 parts by weight), for example, 1 to 50 parts by weight (for example, 3 to 40 parts by weight), preferably 5 to 30 parts by weight (for example, 5 to 30 parts by weight).
It may be about 8 to 25 parts by weight), more preferably 10 to 20 parts by weight (for example, 10 to 15 parts by weight). If the proportion of the second polyfunctional (meth) acrylate is too large, the refractive index and handleability may decrease.

The ratio of the total amount of the first polyfunctional (meth) acrylate and the second polyfunctional (meth) acrylate is, for example, 10 with respect to the total amount of the polyfunctional (meth) acrylate contained in the curable composition. Even if it is about 70% by weight or more (for example, 30 to 100% by weight), preferably 50% by weight or more (for example, 70 to 99% by weight), and more preferably 90% by weight or more (for example, 90 to 95% by weight). It may be substantially 100% by weight.

The ratio of the second polyfunctional (meth) acrylate is, for example, 0.1 to 50 parts by weight (for example, 1 to 30 parts by weight) with respect to 100 parts by weight of the first polyfunctional (meth) acrylate. ), It may be preferably about 5 to 25 parts by weight (for example, 10 to 20 parts by weight), and more preferably about 12 to 18 parts by weight (for example, 14 to 17 parts by weight). If the proportion of the second polyfunctional (meth) acrylate is too large, the refractive index and handleability may decrease.

[Second monofunctional (meth) acrylate]
The curable composition of the present invention may further contain a compound represented by the following formula (4) as the second monofunctional (meth) acrylate.

(In the formula, Ar ¹ represents an arene ring, R ¹² represents a hydrogen atom or a non-polymerizable substituent, and R ¹ , R ² , R ³ , R ⁴ , k, m and n are the above formulas including preferred embodiments. Same as (1)).

In the formula (4), the ^{arene ring represented by Ar 1} includes, for example, the same as the arene ring exemplified in the section of the ring Ar in the formula (2). Of these rings Ar ¹ _{, C 6-14} arene rings such as a benzene ring, a naphthalene ring, and a biphenyl _{ring are preferable, and among them, a C 8-14} polycycle such as a naphthalene ring and a biphenyl ring is preferable from the viewpoint of high refractive index. It may be a formula arene ring (particularly, a naphthalene ring).

(Meth) substitution position of acryloyl group-containing group is not particularly limited, it can be replaced in a suitable position on the ring Ar ^1, when the ring Ar ¹ is a benzene ring, a phenyl group substituted in the 9-position of the fluorene ring It may be replaced with any of the 2 to 6-positions (for example, the 3 to 5 positions, preferably the 4-position). When the ring Ar ¹ is a naphthalene ring, it is often substituted with any of the 5-8-positions of the naphthyl group, for example, the 1-position or the 1-position of the naphthalene ring with respect to the 9-position of the fluorene ring. The 2-position is substituted (replaced by the relationship of 1-naphthyl or 2-naphthyl), and the relationship such as 1,5-position, 2,6-position (especially the 2,6-position) with respect to this substitution position. In many cases, the (meth) acryloyl group-containing group is substituted in (relationship). When the ring Ar ¹ is a biphenyl ring, the 9-position of the fluorene ring is often replaced by the 3-position or 4-position (particularly the 3-position) of the biphenyl ring, for example, the fluorene ring. In many cases, the 3-position of the biphenylyl group is substituted at the 9-position, and the (meth) acryloyl group-containing group is substituted at the 6-position of the biphenylyl group.

The substitution position of the group R ² is not particularly limited, and it may be substituted at a position other than the 9-position of the fluorene ring and the substitution position of the (meth) acryloyl group-containing group in the ^{ring Ar 1.}

The ^{non-polymerizable substituent (non-radical polymerizable substituent) represented by R 12} may be a group having no ethylenically unsaturated bond, and is, for example, a group exemplified as ^{R 2 in the above formula (1).} Examples thereof include a group similar to the above, a hydroxy (poly) alkoxyaryl group represented by the following formula (5), and the like.

(In the formula, R ² , R ³ , m and n are the same including the preferred embodiment in the above formula (1), and Ar ¹ is the same including the preferred embodiment in the above formula (4).)

In the hydroxy (poly) alkoxyaryl group represented by the formula (5), the substitution position of the hydroxy (poly) alkoxy group includes the same substitution position as the (meth) acryloyl group-containing group in the formula (4). .. The substitution position of the group R ² is not particularly limited, in the ring Ar ^1, need only be replaced in a position other than the substitution position of the 9-position and hydroxy (poly) alkoxy group fluorene ring.

Preferred ^{R 12,} a hydrogen atom, a hydrocarbon group [for example, _(such as _{C 1-6} alkyl group) alkyl group, _(such as _{C 5-10} cycloalkyl group) cycloalkyl group, an aryl group _{(C 6-12} aryl group , Etc.), aralkyl group (C _6-12aryl C _1-6 alkyl group, etc.)], alkoxy group, hydroxy (poly) alkoxyaryl group represented by the above formula (5), etc. A hydroxy (poly) alkoxyaryl group represented by the formula (5) is preferable.

As a typical compound represented by the above formula (4), for example, a compound represented by the following formula (4a) can be mentioned.

(In the formula, Ar ¹ , R ¹ , R ² , R ³ , R ⁴ , k, m and n are the same as those in the above formula (4) including preferable embodiments.)

In the above formula (4a), Ar ¹ , R ¹ , R ² , R ³ , k and m may be different from each other, but usually they are often the same. Further, n may be the same or different from each other.

Specifically, the compound represented by the formula (4a) is, for example, 9,9-bis [hydroxy (poly) alkoxyphenyl] fluorene {for example, 9,9-bis [hydroxy (poly) alkoxyphenyl] fluorene. (For example, 9,9-bis [hydroxy (mono to deca) C _2-4 alkoxyphenyl] fluorene such as 9,9-bis [4- (2-hydroxyethoxy) phenyl] fluorene); 9,9-bis [Alkyl-hydroxy (poly) alkoxyphenyl] fluorene (eg, 9,9-bis [3-methyl-4- (2-hydroxyethoxy) phenyl] fluorene, 9,9-bis [3,5-dimethyl-4-4] (2-Hydroxyethoxy) phenyl] fluorene, etc. 9,9-bis [(mono or di) C _1-4 alkyl-hydroxy (mono to deca) C _2-4 alkoxyphenyl] fluorene, etc.); 9,9-bis _{9,9-bis [C 6-10} aryl-hydroxy] such as [aryl-hydroxy (poly) alkoxyphenyl] fluorene (eg, 9,9-bis [3-phenyl-4- (2-hydroxyethoxy) phenyl] fluorene) (Mono to deca) C _2-4 alkoxyphenyl] fluorene, etc.}; 9,9-bis [hydroxy (poly) alkoxynaphthyl] fluorenes {for example, 9,9-bis [6- (2-hydroxyethoxy)) -2-naphthyl] fluorene, 9,9-bis [5- (2-hydroxyethoxy) -1-naphthyl] fluorene, etc. 9,9-bis [hydroxy (mono to deca) C _2-4 alkoxynaphthyl] fluorene, etc. } And the like (a compound in which the (meth) acryloyl group is replaced with a hydrogen atom in the above formula (4a)), such as mono (meth) acrylate.

The second monofunctional (meth) acrylate represented by these formulas (4) (or formula (4a)) can also be used alone or in combination of two or more. Of the second monofunctional (meth) acrylates represented by these formulas (4) (or formula (4a)), 9,9-bis [6-(from the viewpoint of high refractive index and ease of procurement). 2-Hydroxyethoxy) -2-naphthyl] fluorene, 9,9-bis [5- (2-hydroxyethoxy) -1-naphthyl] fluorene and other 9,9-bis [hydroxy (poly) alkoxynaphthyl] fluorenes Mono (meth) acrylate is preferred.

The second monofunctional (meth) acrylate represented by the formula (4) (for example, the formula (4a)) may be synthesized by a conventional method, and is usually represented by the formula (1). It may be synthesized as a by-product in preparing the first polyfunctional (meth) acrylate. The operation of isolating the first polyfunctional (meth) acrylate and the compound represented by the formula (4) (for example, the formula (4a)) may be difficult (complex or impractical). Therefore, after preparing the first polyfunctional (meth) acrylate, the compound represented by the formula (4) (for example, the formula (4a)) is not removed by purification in the curable composition. May be added to. When the curable composition contains a second monofunctional (meth) acrylate represented by the formula (4) (for example, the formula (4a)), the handleability and the scratch resistance are improved without lowering the refractive index. Can be improved.

The proportion of the second monofunctional (meth) acrylate is the area proportion in high performance (or high performance) liquid chromatography (HPLC), the first polyfunctional (meth) acrylate and the second monofunctional (meth) acrylate. ) With respect to the total amount of acrylate, for example, 1-30% (eg, 3-20%), preferably 4-15% (eg, 4-12%), more preferably 4.5-10% (eg, eg, 4-12%). It may be about 5 to 8%). The area ratio can be measured by the method described in Examples described later.

The ratio of the second monofunctional (meth) acrylate is, for example, 0.1 to 100 parts by weight based on 100 parts by weight of the total amount of the first polyfunctional (meth) acrylate and the second monofunctional (meth) acrylate. It is about 30 parts by weight (for example, 1 to 25 parts by weight), preferably about 2 to 20 parts by weight (for example, 3 to 15 parts by weight), and more preferably about 4 to 12 parts by weight (for example, 5 to 10 parts by weight). It may be usually about 3.5 to 8 parts by weight (for example, 4.5 to 6 parts by weight). If the proportion of the second monofunctional (meth) acrylate is too small, the handleability may be deteriorated.

The ratio of the second monofunctional (meth) acrylate is, for example, 0.1 to 100 parts by weight (for example, 0.5 to 50 parts by weight) with respect to 100 parts by weight of the first monofunctional (meth) acrylate. ), For example, 1 to 40 parts by weight (for example, 2 to 30 parts by weight), preferably 3 to 25 parts by weight (for example, 4 to 20 parts by weight), and more preferably 5 to 15 parts by weight. It may be about (for example, 5 to 10 parts by weight), for example, about 8 to 40 parts by weight (for example, 10 to 35 parts by weight), preferably about 15 to 30 parts by weight (for example, 20 to 25 parts by weight). It may be.

The ratio of the second monofunctional (meth) acrylate can be selected from the range of, for example, about 0.1 to 100% by weight (for example, 1 to 50% by weight) with respect to the entire monofunctional (meth) acrylate. For example, it may be about 2 to 40% by weight (for example, 3 to 30% by weight), preferably about 4 to 20% by weight (for example, 5 to 15% by weight), and for example, 10 to 30% by weight (for example). It may be about 15 to 25% by weight).

[Other ingredients]
(Other polymerizable components)
The curable composition of the present invention may further contain other polymerizable components (or monomer components), if necessary. The other polymerizable component is not particularly limited as long as it is a compound containing one or more ethylenically unsaturated bonds, and is not particularly limited as long as it contains an α-olefin monomer (for example, ethylene, propylene, etc.), a styrene monomer (for example, styrene, etc.). (Α-Methylstyrene, vinyltoluene, etc.), (meth) acrylic acid, etc. may be used, but usually, a third monofunctional (meth) acrylate, a third polyfunctional (meth) acrylate, etc., which will be described later, are used. Can be mentioned.

_{The third monofunctional (meth) acrylate includes, for example, C 1} such as an aliphatic monofunctional (meth) acrylate [for example, methyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate and the like. _-20 Alkyl (meth) acrylate, etc.]; Alicyclic monofunctional (meth) acrylate [eg, C _5-10 cycloalkyl (meth) acrylate, such as cyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, Bridging ring (meth) acrylates such as isobornyl (meth) acrylates]; aromatic monofunctional (meth) acrylates (but not including first and second monofunctional (meth) acrylates) [eg, not including first and second monofunctional (meth) acrylates). _{, C 6-12} aryl (meth) acrylate such as phenyl (meth) acrylate _{, C 7-13} aralkyl (meth) acrylate such as benzyl (meth) acrylate, bisphenol such as mono (meth) acrylate of ethylene oxide adduct of bisphenol A Mono (meth) acrylates of the same class (or alkylene oxide adducts thereof), (meth) acrylates having a fluorene skeleton such as 9- (meth) acryloyloxymethylfluorene]; monofunctional (meth) acrylates containing sulfur atoms. (However, the first and second monofunctional (meth) not including acrylate.) [e.g., _{C 6,} such as a _{C 1-6} alkylthio (meth) acrylate, phenylthio (meth) acrylates such as methylthio (meth) acrylate C _6-10 aryl C _{1-6 alkyl thio (meth) acrylate such as -10} aryl thio (meth) acrylate and benzyl thio (meth) acrylate] and the like. These third monofunctional (meth) acrylates can also be used alone or in combination of two or more.

Examples of the third polyfunctional (meth) acrylate include C _2-10 alkylene glycol di (meth) acrylates such as ethylene glycol di (meth) acrylate and butanediol di (meth) acrylate; diethylene glycol di (meth) acrylate. Polyalkylene glycol di (meth) acrylates such as 9,9-bis (4- (meth) acryloyloxy (poly) ethoxyphenyl) fluorene, 9,9-bis (4- (meth) acryloyloxy (poly) ethoxy- In the above formula (1) such as 3-methylphenyl) fluorene and 9,9-bis (4- (meth) acryloyloxy (poly) ethoxy-3-phenylphenyl) fluorene, the ring Z is a benzene ring or a biphenyl ring. Compounds: Poly (meth) poly (meth) of polyols such as trimethylolpropantri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate dipentaerythritol hexa (meth) acrylate. ) Acrylate; Urethane (meth) acrylate; Epoxy (meth) acrylate (however, the second polyfunctional (meth) acrylate is not included); polyester (meth) acrylate and the like. These third polyfunctional (meth) acrylates may be used alone or in combination of two or more.

The proportion of these other polymerizable components (eg, the total amount of the third monofunctional (meth) acrylate and the third polyfunctional (meth) acrylate) is the proportion of the first polyfunctional (meth) acrylate. With respect to 100 parts by weight, for example, it may be 0 to 200 parts by weight, preferably 10 to 100 parts by weight, and more preferably about 20 to 50 parts by weight.

(Polymerization initiator)
The curable composition may contain a polymerization initiator in addition to the polymerizable component (or monomer component). The polymerization initiator may be a thermal polymerization initiator (thermal radical generator) or a photopolymerization initiator (photoradical generator).

Examples of the thermal polymerization initiator include organic peroxides [eg, dialkyl peroxides (eg, di-tert-butyl peroxide, etc.), diacyl peroxides (eg, lauroyl peroxide, benzoyl peroxide, etc.), and the like. Peracids (or peracid esters) (eg, tert-butyl hydroperoxide, cumene hydroperoxide, tert-butyl peracetate, etc.), ketone peroxides, peroxycarbonates, peroxyketals, etc.], azo Examples thereof include compounds [for example, azonitrile compounds such as 2,2'-azobis (isobutyronitrile), azoamide compounds, azoamidine compounds, etc.]. These thermal polymerization initiators can be used alone or in combination of two or more.

Examples of the photopolymerization initiator include benzoins (for example, benzoin alkyl ethers such as benzoin and benzoin ethyl ether) and acetophenones (for example, acetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-). On, etc.), aminoacetophenones {eg, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinoaminopropanol-1, etc.}, anthraquinones (eg, anthraquinone, 2-methylanthraquinone, etc.), Thioxanthons (eg, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, 2-chlorothioxanthone, etc.), ketals (eg, acetophenone dimethyl ketal, benzyl dimethyl ketal, etc.), benzophenones (eg, benzophenone, etc.), Xanthons and the like can be exemplified. These photopolymerization initiators may be used alone or in combination of two or more.

The ratio of the polymerization initiator (heat and / or photopolymerization initiator) is 0.1 to 15 parts by weight, preferably 0.5 to 10 parts by weight (for example, 1 to 1) with respect to 100 parts by weight of the total amount of the polymerizable components. 8 parts by weight), more preferably about 2 to 5 parts by weight.

The photopolymerization initiator may be combined with a photosensitizer. Examples of photosensitizers include tertiary amines {eg, trialkylamines, trialkanolamines (eg, triethanolamine, etc.), ethyl N, N-dimethylaminobenzoate [eg, p- (dimethylamino, etc.). ) Ethyl benzoate, etc.], dialkylaminobenzoic acid alkyl esters such as N, N-dimethylaminobenzoate amyl [eg, p- (dimethylamino) benzoate amyl, etc.], 4,4-bis (diethylamino) benzophenone, etc. Examples thereof include conventional photosensitizers such as bis (dialkylamino) benzophenone and dialkylaminobenzophenone such as 4- (dimethylamino) benzophenone}. These photosensitizers may be used alone or in combination of two or more.

The ratio of the photosensitizer may be 1 to 200 parts by weight, preferably 5 to 150 parts by weight, and more preferably 10 to 100 parts by weight with respect to 100 parts by weight of the polymerization initiator.

(solvent)
Moreover, since the curable composition can improve the handleability, it does not have to contain a solvent substantially, but may contain a solvent if necessary. The solvent is not particularly limited, and for example, hydrocarbons (for example, aliphatic hydrocarbons such as hexane and heptane, alicyclic hydrocarbons such as cyclohexane, aromatic hydrocarbons such as toluene and xylene, etc.). Halogenized hydrocarbons (eg, methylene chloride, chloroform, 1,2-dichloroethane, chlorobenzene, etc.); Ethers (eg, dialkyl ethers such as diethyl ether, cyclic ethers such as tetrahydrofuran, dioxane, etc.); Ketones (For example, dialkyl ketones such as acetone and methyl ethyl ketone, cyclic ketones such as cyclohexanone, etc.); Esters (for example, acetate esters such as methyl acetate, ethyl acetate, butyl acetate, etc.); Glycol ether acetates (for example, propylene) (Poly) alkylene glycol monoalkyl ether acetates such as glycol monomethyl ether acetate, diethylene glycol monobutyl ether acetate, etc.); Sulfoxides (eg, dimethyl sulfoxide, etc.); Amidos (eg, dimethylformamide, dimethylacetamide, N-methylpyrrolidone, etc.) ); nitriles (for example, acetonitrile, etc.) can be exemplified. These solvents can also be used alone or as a mixed solvent in combination of two or more.

The ratio of the solvent may be about 1 to 5000 parts by weight, preferably 100 to 1000 parts by weight, and more preferably about 200 to 500 parts by weight with respect to 100 parts by weight of the total amount of the polymerizable component.

(Other additives)
In addition, the curable composition may optionally include conventional additives such as colorants, stabilizers (heat stabilizers, antioxidants, UV absorbers, etc.), fillers, antistatic agents, flame retardants, etc. It may contain a surfactant, a plasticizer, a curing agent, a polymerization inhibitor and the like. These additives can be used alone or in combination of two or more.

The ratio of the additive may be 0.1 to 30 parts by weight, preferably 0.5 to 10 parts by weight, and more preferably about 1 to 5 parts by weight with respect to 100 parts by weight of the total amount of the polymerizable component. ..

[Cursable composition and cured product]
The curable composition of the present invention is easily cured by applying active energy (or active energy rays) to produce a cured product. As the active energy, thermal energy and / or light energy (for example, ultraviolet rays, X-rays, etc.) are useful.

In the case of heat treatment using heat energy, the heating temperature may be, for example, 50 to 200 ° C., preferably 60 to 150 ° C., and more preferably 70 to 120 ° C.

When light is irradiated using light energy (for example, ultraviolet rays), the amount of light irradiation energy can be appropriately selected depending on the application, for example, 50 to 10,000 mJ / cm ² , preferably 70 to 8000 mJ / cm ^2. More preferably, it may be about 100 to 5000 mJ / cm ² (for example, ^{500 to 3000 mJ / cm 2).}

The shape of the cured product is not particularly limited and may be a cured product having a three-dimensional structure (for example, a lens, a tubular cured product, etc.), or a cured product (or a cured film) having a two-dimensional structure (for example, a film, etc.). It may be a cured product having a one-dimensional structure (for example, a cured product having a linear or rod shape).

The method for producing a cured product is not particularly limited. For example, as a method for producing a cured product having a three-dimensional structure or a one-dimensional structure, the curable composition is molded or in a predetermined mold according to the shape of the cured product. After casting (injection) into, it may be produced by curing treatment (heating and / or light irradiation). Further, as a method for producing a cured product having a two-dimensional structure, for example, the curable composition is used as a base material or a substrate [for example, metal (for example, aluminum), ceramics (for example, titanium oxide, glass, quartz, etc.), etc. To form a film-like coating film (or thin film) by applying it to an inorganic material, an organic material such as a plastic (for example, a cyclic olefin resin, a polycarbonate resin, etc.), a porous body such as wood, etc.] It may be manufactured by subjecting it to a curing treatment.

Since the curable composition of the present invention contains a first polyfunctional (meth) acrylate and a first monofunctional (meth) acrylate, it is not in a solid state despite having a high refractive index. , At least in a viscous (or liquid) form, and is excellent in handleability.

The viscosity (temperature 25 ° C.) of the curable composition can be selected from the range of, for example, 0.01 to 500 Pa · s (for example, 0.05 to 400 Pa · s), and is, for example, 0.1 to 300 Pa · s (for example). For example, about 0.3 to 200 Pa · s), preferably 0.5 to 100 Pa · s (for example, 0.8 to 50 Pa · s), and more preferably about 1 to 10 Pa · s (for example, 3 to 5 Pa · s). It may be, for example, about 2 to 20 Pa · s (for example, 3 to 8 Pa · s). The viscosity can be measured by the method described in Examples described later.

The refractive index (refractive index before curing) (temperature 25 ° C., wavelength 589 nm) of the curable composition before curing is, for example, 1.55 to 1.7 (for example, 1.57 to 1.65, or 1.58). It can be selected from the range of about 1.6), for example, 1.57 to 1.67 (for example, 1.58 to 1.66), preferably 1.59 to 1.65, and more preferably 1.6 to 1.65. It may be about 1.64. The refractive index can be measured by the method described in Examples described later.

Further, the cured product of the present invention is also excellent in curability, probably because it is easy to handle (or has a low viscosity). The curable composition usually has a tendency to improve the refractive index by curing, and a curable composition in which 3 parts by weight of a photopolymerization initiator is mixed with 100 parts by weight of a polymerizable component is prepared and UV-irradiated (UV irradiation). The refractive index (temperature 25 ° C., wavelength 589 nm) of the cured product cured by 500 mJ / cm ² ) (for example, the cured product cured by the method described in the section of Examples described later) is, for example, 1.55-1. It can be selected from a range of about .7, and may be, for example, 1.6 to 1.68, preferably 1.61 to 1.67, and more preferably 1.62 to 1.66.

Further, the cured product of the present invention has a surprisingly low hardness even though it contains a large amount of (meth) acrylate having a rigid polycyclic aromatic hydrocarbon ring skeleton. The pencil hardness of the cured product cured under the above conditions may be, for example, 5B to 3H (for example, 4B to 2H), preferably 3B to H (for example, 2B to F), and more preferably about B to HB. .. The pencil hardness can be measured by the method described in Examples described later.

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples. In addition, various evaluation methods and raw materials used are shown below.

(viscosity)
The viscosity at 25 ° C. was measured using a TV-22 type viscometer (cone plate type, "TVE-22L" manufactured by Toki Sangyo Co., Ltd.), and an optional rotor (01: 1 ° 34'x R24, according to the measured viscosity). 07: 3 ° x R7.7) was selected, and the measurement was performed at a rotation speed of 0.5 to 20 rpm.

(Refractive index)
The refractive index at a temperature of 25 ° C. and 589 nm was measured using a multi-wavelength Abbe refractometer (DR-M2 <circulating constant temperature water tank 60-C3> manufactured by Atago Co., Ltd.).

Since Comparative Example 3 was a white powder, a plurality of toluene solutions having different concentrations were prepared, and the refractive index of each solution was measured. The obtained results are plotted on a graph with the horizontal axis: density and the vertical axis: refractive index, an approximate straight line is calculated by the least squares method, and the value of 100% density in this approximate straight line is the refractive index of Comparative Example 3. And said.

(hardness)
The prepared cured product is placed on a surface measuring instrument (“HEIDON-14DR” manufactured by Shinto Kagaku Co., Ltd.), and various pencils are pressed against the cured product at an angle of 45 ° and a load of 750 g to cure at a speed of 1 mm / sec. Moved on the object. After the test, the pencil hardness was measured by visually confirming the presence or absence of scratches on the cured product.

(Curable)
From the tactile sensation of the prepared cured product surface, the curability was evaluated according to the following criteria.
◯: No tackiness (adhesiveness) on the surface of the cured product ×: Tackiness (adhesiveness) on the surface of the cured product.

(Scratch resistance)
Using a surface measuring instrument (“HEIDON-14DR” manufactured by Shinto Kagaku Co., Ltd.), attach steel wool # 0000 to the tip of a pencil hardness tester, and apply a load of 250 g vertically to the cured product (50 mm × 15 mm × 2 mm). It was loaded and moved on the cured product at a speed of 1 mm / s, and the presence or absence of scratches was visually confirmed. This operation was performed on five cured products, and scratch resistance was evaluated according to the following criteria.
◯: All cured products are not scratched △: There is a cured product that is damaged even by one, but recovery can be confirmed for all the cured products that are damaged. ×: There is a cured product that is damaged even by one, and there are scratches. Some of the attached cured products cannot be confirmed to be recoverable.

(HPLC)
Using "L-2000" manufactured by Hitachi High-Technologies Corporation, perform high performance (or high performance) liquid chromatography (HPLC) under the following conditions, and measure the area ratio (or LC purity) and acrylicization reaction rate. Was calculated.

Column Imtakt Cadenza 3 μm CD-CL18 3.0 × 250 mm
Guard Column Imtaket GCCDOS
Acetonitrile / distilled water = 70/30 (Kanto Chemical, LC grades), flow rate 0.5 ml / min Detector L-2420 form UV-VIS detector _{(D 2} lamp, 254 nm).

(Solid content concentration)
Using a halogen moisture meter (“HG53” manufactured by METTLER TOLEDO CO., LTD.), The volatile residue at 200 ° C. was measured as a solid content.

(material)
BPEFA: Osaka Gas Chemical Co., Ltd., 9,9-bis [4- (2-acryloyloxyethoxy) phenyl] fluorene BNEFA: 9,9-bis [6- (2-acryloyloxyethoxy) -2-naphthyl] Fluorene (prepared according to Synthesis Example 1 described later)
BNEF-1A: 9,9-bis [6- (2-hydroxyethoxy) -2-naphthyl] fluorene (BNEF) monoacrylate (by-product during the synthesis of BNEFA)
BNEF-xEOA: Diacrylate of BNEF-xEO {addition with x mol of ethylene oxide (EO) added to 1 mol of BNEF} (prepared according to Synthesis Examples 3 to 9 described later)
BNEF-xEO-1A: Monoacrylate of BNEF-xEO (by-product during synthesis of the corresponding BNEF-xEOA)
POA: "Light acrylate PO-A" manufactured by Kyoeisha Chemical Co., Ltd., 2-phenoxyethyl acrylate NEOA: 2- (2-naphthoxy) ethyl acrylate (prepared according to Synthesis Example 2 described later)
OPPEOA: Nippon Kayaku Co., Ltd., o-phenylphenoxyethyl acrylate PETA: Miwon Specialty Chemical Co., Ltd, 2- (phenylthio) ethyl acrylate epoxy ester 3000A: Kyoeisha Chemical Co., Ltd., bisphenol A diglycidyl Acrylic acid adduct of ether FA-324A: manufactured by Hitachi Kasei Kogyo Co., Ltd., diacrylate ylgacure 184: manufactured by BASF Japan Co., Ltd., in which an average value of 4 mol of ethylene oxide is added to 1 mol of bisphenol A. Photopolymerization initiator.

(Synthesis Example 1) Synthesis of BNEFA 43.5 g (0.08 mol) of 9,9-bis [6- (2-hydroxyethoxy) -2-naphthyl] fluorene (BNEF) in a 500 mL three-necked flask equipped with Dean-Stark. 45.4 g (0.63 mol) of acrylic acid, 0.17 g (0.0014 mol) of 2-methoxyphenol and 79 g of toluene were added. The inside of the system was replaced with nitrogen, the temperature was raised to 60 ° C. to dissolve the components, and then 3.84 g (0.020 mol) of p-toluenesulfonic acid monohydrate was added. After nitrogen substitution again, the temperature was raised to 115 ° C. and reflux dehydration was carried out for 4 hours.

The obtained solution was washed with 281 g of toluene and 20% by weight saline solution, and then neutralized with 10 wt% sodium hydroxide aqueous solution and 20 wt% saline solution, and it was confirmed that the aqueous layer had a pH of 10 or more. Then, 500 ppm of 2-methoxyphenol was added to the organic layer to homogenize the solution. This solution was washed twice with 20 wt% saline solution and twice with distilled water, and it was confirmed that the aqueous layer had a pH of 7. The filtrate obtained by filtering the organic layer with Celite was concentrated and then dried under reduced pressure to obtain a powdery white solid containing BNEFA (yield 47 g, yield 90%). When the obtained BNEFA mixture (first polyfunctional acrylate mixture) was analyzed by HPLC, the area ratio of BNEFA, which is a diacrylate (2A), was 87.5%, and the monoacrylate (1A). The area ratio of BNEF-1A was 4.9%.

(Synthesis Example 2) Synthesis of NEOA In a 500 mL three-necked flask equipped with Dean-Stark, 49.4 g (0.26 mol) of 2- (2-naphthyloxy) ethanol (NEO), 24.6 g (0.34 mol) of acrylic acid, 0.56 g (0.0046 mol) of 4-methoxyphenol and 256 g of toluene were added. The inside of the system was replaced with nitrogen, the temperature was raised to 60 ° C. to dissolve the components, and then 6.24 g (0.033 mol) of p-toluenesulfonic acid monohydrate was added. After nitrogen substitution again, the temperature was raised to 115 ° C. and reflux dehydration was performed for 3 hours.

The obtained solution was washed with 20% by weight saline solution and then neutralized with 10 wt% sodium hydroxide aqueous solution and 20 wt% saline solution, and it was confirmed that the aqueous layer had a pH of 10 or more. Then, 500 ppm of 4-methoxyphenol was added to the organic layer to homogenize the solution. This solution was washed twice with 20 wt% saline solution and three times with distilled water, and after confirming that the aqueous layer had a pH of 7, the organic layer was concentrated and filtered through Celite. After filtration, the filtrate was concentrated and dried to obtain NEOA, which is a powdery white solid. The refractive index (25 ° C., 589 nm) of the obtained NEOA was 1.59.

(Comparative Examples 1 to 3 and Examples 1 to 6)
Each polymerizable component was mixed at the ratio shown in Table 1 to prepare a curable composition, and the viscosity and the refractive index (before curing) were measured.

To 100 parts by weight of each curable composition (polymerizable component) prepared, 3 parts by weight of a photopolymerization initiator was added, and the mixture was heated, melted and mixed. Each of the obtained curable compositions was applied onto a TAC (cellulose acetate) film to a film thickness of 200 μm using an applicator, and UV irradiation (500 mJ / cm ² ) was performed once to prepare a cured product. .. Each of the obtained cured products was in the form of a film having a film thickness of about 100 μm, and the refractive index, pencil hardness and curability of this cured product were measured.

The composition and evaluation results of the curable composition are shown in Table 1. In Table 1, the first polyfunctional acrylate mixture containing the 1A compound obtained in the synthetic example is also simply referred to as "first polyfunctional acrylate". In addition, the numbers in parentheses in Table 1 mean parts by weight (hereinafter, the same applies to Tables 2 to 7).

As is clear from Table 1, in the examples, as compared with the comparative examples, both high refractive index and handleability (or low viscosity) could be achieved, and the curability was also good. In particular, in Examples 1 and 2, the obtained curable composition became a viscous body even though the solids were mixed with each other, and the handleability was unexpectedly improved. In the field of optical materials, a difference of 0.01 after curing is evaluated as a significant difference. Further, in Examples 1 to 6, as compared with Comparative Example 2, even if a large amount of (meth) acrylate having a polycyclic aromatic hydrocarbon ring skeleton is contained, the hardness is the same or low, and the refractive index is high and the handling is high. We were able to improve both sexuality and flexibility in a well-balanced manner. In particular, Examples 1 to 2 and 5 to 6 contain a first monofunctional (meth) acrylate having a more rigid naphthalene skeleton and a biphenyl skeleton as compared with the benzene skeleton, but Examples 3 and 5 to 6 contain. Compared with 4, the hardness was unexpectedly low.

(Examples 7 to 15)
Each polymerizable component is mixed at the ratio shown in Table 2 to prepare a curable composition, and the viscosity and refractive index of the curable composition are prepared by the same methods as in Comparative Examples 1 to 3 and Examples 1 to 6. (Before curing), the refractive index, pencil hardness and curability of the cured product were measured. Table 2 shows the composition and evaluation results of the curable composition.

As is clear from Table 2, in each of the examples, both high refractive index and handleability were compatible, and the curability was also good. Further, as compared with Comparative Example 2, although it contains a large amount of (meth) acrylate having a polycyclic aromatic hydrocarbon ring skeleton, it has low hardness, high refractive index, handleability and flexibility. I was able to improve it in a well-balanced manner.

Furthermore, in Examples 8 and 10 in which NEOA is combined with OPPEOA or POA, the composition ratios of the first polyfunctional and monofunctional (meth) acrylates are equal, and a single first monofunctionality ( Compared with Examples 2, 4 and 6 containing meta) acrylate, the hardness could be unexpectedly reduced.

(Examples 16 to 19)
Each polymerizable component is mixed at the ratio shown in Table 3 to prepare a curable composition, and the viscosity and refractive index of the curable composition are prepared by the same methods as in Comparative Examples 1 to 3 and Examples 1 to 6. (Before curing), refractive index of cured product), pencil hardness and curability were measured. The composition and evaluation results of the curable composition are shown in Table 3.

As is clear from Table 3, in each of the examples, both high refractive index and handleability were compatible, and the curability was also good. Further, as compared with Comparative Example 2, although it contains a large amount of (meth) acrylate having a polycyclic aromatic hydrocarbon ring skeleton, it has low hardness, high refractive index, handleability and flexibility. I was able to improve it in a well-balanced manner. Further, as compared with Examples 3 and 4 containing POA, in Examples 16 to 19, the hardness could be further reduced while suppressing the increase in viscosity and the decrease in the refractive index.

(Synthesis Example 3) Synthesis of BNEF-10.3EOA 9,9-bis [6- (2-hydroxyethoxy)] according to the method for preparing an ethylene oxide adduct described in Example 1 of JP-A-2001-139651. -2-naphthyl] Ethylene oxide adduct of BNEF was prepared using 10 mol of ethylene oxide (EO) with respect to 1 mol of fluorene (BNEF, manufactured by Osaka Gas Chemical Co., Ltd.). From the hydroxyl value of 113 mgKOH / g of the obtained product, it was found that the compound BNEF-10.3EO had 10.3 mol of EO added to 1 mol of BNEF.

BNEF-10.3EO 77.8 g (0.07 mol), acrylic acid 13.7 g (0.19 mol), 2-methoxyphenol 0.16 g (0.0013 mol) and toluene 86 g in a 500 mL three-necked flask with Dean Stark. added. The inside of the system was replaced with nitrogen, the temperature was raised to 60 ° C. to dissolve the components, 1.7 g (0.009 mol) of p-toluenesulfonic acid monohydrate was added, and after nitrogen replacement again, the temperature was 115 ° C. The temperature was raised to about 4 hours, and the mixture was dehydrated by reflux and cooled. After washing by adding 254 g of toluene and 20% by weight saline solution to the obtained solution, it was neutralized with 10 wt% sodium hydroxide aqueous solution and 20 wt% saline solution, and it was confirmed that the aqueous layer had a pH of 10 or more. did. After adding 500 ppm of 2-methoxyphenol to the organic layer and homogenizing the solution, it was washed twice with 20 wt% saline solution and twice with distilled water, and it was confirmed that the aqueous layer had a pH of 7. Then, the organic layer was concentrated, filtered through Celite, and then concentrated and dried to obtain a first polyfunctional acrylate mixture containing BNEF-10.3EOA. When the obtained first polyfunctional acrylate mixture was analyzed by HPLC, the area ratio of BNEF-10.3EOA, which is a diacrylate body (2A body), was 88.2%, and it was a monoacrylate body (1A body). The area ratio of BNEF-10.3EO-1A was 8.3%.

(Synthesis Example 4) Synthesis of BNEF-11.1EOA An EO adduct of BNEF was prepared in the same manner as in Synthesis Example 3 except that the amount of EO used in Synthesis Example 3 was 12.0 mol. From the hydroxyl value of 109 mgKOH / g of the obtained product, it was found that the compound was BNEF-11.1 EO in which 11.1 mol of EO was added to 1 mol of BNEF.

BNEF-11.1EO 75.2 g (0.07 mol), acrylic acid 13.2 g (0.18 mol), 2-methoxyphenol 0.15 g (0.0012 mol) and toluene 102 g in a 500 mL three-necked flask with Dean Stark. added. The inside of the system was replaced with nitrogen, the temperature was raised to 60 ° C. to dissolve the components, 1.7 g (0.009 mol) of p-toluenesulfonic acid monohydrate was added, and after nitrogen replacement again, the temperature was 115 ° C. The temperature was raised to about 4 hours, and the mixture was dehydrated by reflux and cooled. After washing by adding 245 g of toluene and 20% by weight saline solution to the obtained solution, neutralize with 10 wt% sodium hydroxide aqueous solution and 20 wt% saline solution, and confirm that the aqueous layer has a pH of 10 or more. did. After adding 500 ppm of 2-methoxyphenol to the organic layer and homogenizing the solution, it was washed twice with 20 wt% saline solution and twice with distilled water, and it was confirmed that the aqueous layer had a pH of 7. Then, the organic layer was concentrated, filtered through Celite, and then concentrated and dried to obtain a first polyfunctional acrylate mixture containing BNEF-11.1EOA. When the obtained first polyfunctional acrylate mixture was analyzed by HPLC, the area ratio of BNEF-11.1EOA, which is a diacrylate body (2A body), was 82.6%, and it was a monoacrylate body (1A body). The area ratio of BNEF-11.1EO-1A was 13.6%.

(Synthesis Example 5) Synthesis of BNEF-11.1EOA In Synthesis Example 4, the first mixture containing BNEF-11.1EOA was obtained in the same manner as in Synthesis Example 4, except that the amount of acrylic acid used was 0.20 mol. A functional acrylate mixture was obtained. When the obtained first polyfunctional acrylate mixture was analyzed by HPLC, the area ratio of BNEF-11.1EOA, which is a diacrylate body (2A body), was 89.0%, and it was a monoacrylate body (1A body). The area ratio of BNEF-11.1EO-1A was 7.8%.

(Synthesis Example 6) Synthesis of BNEF-13.0EOA An EO adduct of BNEF was prepared in the same manner as in Synthesis Example 3 except that the amount of EO used in Synthesis Example 3 was 13.0 mol. From the hydroxyl value of 101 mgKOH / g of the obtained product, it was found that the compound was BNEF-13.0EO in which 13.0 mol of EO was added to 1 mol of BNEF.

BNEF-13.0EO 77.7 g (0.07 mol), acrylic acid 13.1 g (0.18 mol), 2-methoxyphenol 0.15 g (0.0012 mol) and toluene 102 g in a 500 mL three-necked flask with Dean Stark. added. The inside of the system was replaced with nitrogen, the temperature was raised to 60 ° C. to dissolve the components, 1.7 g (0.009 mol) of p-toluenesulfonic acid monohydrate was added, and after nitrogen replacement again, the temperature was 115 ° C. The temperature was raised to about 4 hours, and the mixture was dehydrated by reflux and cooled. After washing by adding 243 g of toluene and 20% by weight saline solution to the obtained solution, neutralize with 10 wt% sodium hydroxide aqueous solution and 20 wt% saline solution, and confirm that the aqueous layer has a pH of 10 or more. did. After adding 500 ppm of 2-methoxyphenol to the organic layer and homogenizing the solution, it was washed twice with 20 wt% saline solution and twice with distilled water, and it was confirmed that the aqueous layer had a pH of 7. Then, the organic layer was concentrated, filtered through Celite, and then concentrated and dried to obtain a first polyfunctional acrylate mixture containing BNEF-13.0EOA. When the obtained first polyfunctional acrylate mixture was analyzed by HPLC, the area ratio of BNEF-13.0EOA, which is a diacrylate body (2A body), was 78.6%, and it was a monoacrylate body (1A body). The area ratio of BNEF-13.0EO-1A was 17.7%.

(Synthesis Example 7) Synthesis of BNEF-13.0EOA In Synthesis Example 6, the first mixture containing BNEF-13.0EOA was obtained in the same manner as in Synthesis Example 6 except that the amount of acrylic acid used was 0.20 mol. A functional acrylate mixture was obtained. When the obtained first polyfunctional acrylate mixture was analyzed by HPLC, the area ratio of BNEF-13.0EOA, which is a diacrylate body (2A body), was 86.3%, and it was a monoacrylate body (1A body). The area ratio of BNEF-13.0EO-1A was 10.1%.

(Synthesis Example 8) Synthesis of BNEF-13.0EOA In Synthesis Example 6, the first mixture containing BNEF-13.0EOA was obtained in the same manner as in Synthesis Example 6 except that the amount of acrylic acid used was 0.22 mol. A functional acrylate mixture was obtained. When the obtained first polyfunctional acrylate mixture was analyzed by HPLC, the area ratio of BNEF-13.0EOA, which is a diacrylate body (2A body), was 90.7%, and it was a monoacrylate body (1A body). The area ratio of BNEF-13.0EO-1A was 5.8%.

(Synthesis Example 9) Synthesis of BNEF-13.0EOA In Synthesis Example 6, the first mixture containing BNEF-13.0EOA was obtained in the same manner as in Synthesis Example 6 except that the amount of acrylic acid used was 0.25 mol. A functional acrylate mixture was obtained. When the obtained first polyfunctional acrylate mixture was analyzed by HPLC, the area ratio of BNEF-13.0EOA, which is a diacrylate body (2A body), was 92.8%, and it was a monoacrylate body (1A body). The area ratio of BNEF-13.0EO-1A was 4.0%.

Using the BNEF-xEOA mixture obtained in Synthesis Examples 3 to 9, a cured product was prepared by the same method as described in Comparative Examples 1 to 3 and Examples 1 to 6. The evaluation results are shown in Table 4. The ratio of 2A body and 1A body is the area ratio by HPLC analysis.

(Examples 20 to 22)
Each polymerizable component was mixed at the ratio shown in Table 5 to prepare a curable composition, and a cured product was prepared by the same method as described in Comparative Examples 1 to 3 and Examples 1 to 6. The composition and evaluation results of the curable composition are shown in Table 5.

As is clear from Table 5, in each of the examples, both high refractive index and handleability were compatible, and scratch resistance (flexibility) and curability were also good. Further, in Examples 20 and 22, the same scratch resistance was exhibited even though a large amount of (meth) acrylate having a polycyclic aromatic hydrocarbon ring skeleton was contained as compared with Example 21. High refractive index, handleability and flexibility could be improved in a well-balanced manner.

(Examples 23 to 25)
Each polymerizable component was mixed at the ratio shown in Table 6 to prepare a curable composition, and a cured product was prepared by the same method as described in Comparative Examples 1 to 3 and Examples 1 to 6. The composition and evaluation results of the curable composition are shown in Table 6.

As is clear from Table 6, in each of the examples, both high refractive index and handleability were compatible, and scratch resistance (flexibility) and curability were also good. Further, in Example 24, as compared with Example 25, although it contains a large amount of (meth) acrylate having a polycyclic aromatic hydrocarbon ring skeleton, it exhibits the same scratch resistance and high refractive index. The rate, handleability and flexibility could be improved in a well-balanced manner.

(Examples 26 to 29)
Each polymerizable component was mixed at the ratio shown in Table 7 to prepare a curable composition, and a cured product was prepared by the same method as described in Comparative Examples 1 to 3 and Examples 1 to 6. The composition and evaluation results of the curable composition are shown in Table 7.

As is clear from Table 7, in each of the examples, both high refractive index and handleability were compatible, and the curability was also good.

Since the curable composition of the present invention is excellent in properties such as low viscosity and high refractive index, it can be used for various purposes. For example, ink materials, light emitting materials (for example, light emitting materials for organic EL), organic semiconductors, graphitization precursors, gas separation films (for example, CO ₂ gas separation films, etc.), coating agents (for example, LEDs (light emitting diodes)). Optical overcoating agents such as coating agents for elements or hard coating agents), lenses [for example, pickup lenses (for example, pickup lenses for DVD (digital versatile disc)), microlenses (for example, for liquid crystal projectors). Microlenses, etc.), optics lenses, etc.], polarizing films (for example, polarizing films for liquid crystal displays, etc.), antireflection films (or antireflection films, for example, antireflection films for display devices, etc.), touch panel films, flexible substrates, etc. Films, Display Films [For example, PDP (Plasma Display), LCD (Liquid Crystal Display), VFD (Vacuum Fluorescent Display), SED (Surface Conduction Electron Emission Display), FED (Electromagnetic Emission Display), NED (Nano Emissive) -Displays), cathode ray tubes, films for displays (especially thin displays) such as electronic paper (filters, protective films, etc.)], membranes for fuel cells, optical fibers, optical waveguides, holograms, etc. In particular, the curable composition of the present invention can be suitably used for optical material applications, and examples of the shape of such an optical material include a film shape (or sheet shape), a plate shape, a lens shape, and a tubular shape. Be done.

Claims (13)

The following formula (1)

(In the formula, each ring Z is a condensed polycyclic arene ring, each R ¹ and each R ² are substituents, each R ³ is a linear or branched alkylene group, and each R ⁴ is a hydrogen atom. Or a methyl group, each k is an integer of 0 to 4, each m is an integer of 0 or more, and each n is an integer of 1 or more.)
The first polyfunctional (meth) acrylate represented by the following formula (2)

(In the formula, R ⁵ is a hydrogen atom or a methyl group, R ⁶ is a linear or branched alkylene group, X is an oxygen atom or a sulfur atom, R ⁷ is an alkyl group, Ar is an allene ring, and p is 1 or more. An integer, q indicates an integer of 0 or more.)
A curable composition comprising a first monofunctional (meth) acrylate represented by and a second monofunctional (meth) acrylate .
The first monofunctional (meth) acrylate is the first condensed polycyclic aromatic monofunctional (meth) acrylate (A) in which Ar is a condensed polycyclic arene ring in the above formula (2). In addition, in the above formula (2), Ar contains at least one selected from the first ring-assembled polycyclic aromatic monofunctional (meth) acrylate (B) in which Ar is a ring-assembled arene ring.
The second monofunctional (meth) acrylate is represented by the following formula (4).

(In the formula, R ¹² is the following formula (5).

^{Ar 1} represents a condensed polycyclic arene ring, and R ¹ , R ² , R ³ , R ⁴ , k, m and n are the same as those in the above formula (1). )
Represented by
The ratio of the second monofunctional (meth) acrylate is 1 to 30% by area ratio in HPLC with respect to the total amount of the first polyfunctional (meth) acrylate and the second monofunctional (meth) acrylate. Is a curable composition . In formula (1), each ring Z is the same or different condensed polycyclic C _10-14 arene ring, each R ² is the same or different alkyl group or aryl group, and each R ³ is C _{2-4 integer.} The curable composition according to claim 1, wherein each k is an integer of 0 to 2, each m is an integer of 0 to 2, and each n is an integer of 1 to 10. The curable composition according to claim 1 or 2 , wherein the first monofunctional (meth) acrylate contains at least the first condensed polycyclic aromatic monofunctional (meth) acrylate (A). In the first monofunctional (meth) acrylate, further, in the first ring-assembled polycyclic aromatic monofunctional (meth) acrylate (B), and in the formula (2) according to claim 1, Ar is used. The curable composition according to claim 3, which comprises at least one selected from the first monocyclic aromatic monofunctional (meth) acrylate (C) which is a monocyclic arene ring. In the formula (2), any of claims 1 to 4 ^{in which R 6} is a linear or branched C _2-4 alkylene group, X is an oxygen atom, p is an integer of 1 to 4, and q is 0. The curable composition according to the description. Furthermore, the following formula (3)

(In the formula, each R ⁸ represents a hydrogen atom, an alkyl group or an aryl group, respectively, and the two R ^8s may be bonded to each other to form a hydrocarbon ring which may have an alkyl group, and each R 8 may be formed. ⁹ is an alkyl group or an aryl group, each R ¹⁰ is a linear or branched alkylene group, each R ¹¹ is a hydrogen atom or a methyl group, r is 0 or 1, and each s is an integer of 0 to 4, respectively. , Each t is an integer of 0 or more, and each u is 0 or 1, respectively.)
The curable composition according to any one of claims 1 to 5 , which comprises a second polyfunctional (meth) acrylate represented by. In formula (3), each R ⁸ is a hydrogen atom or C _1-4 alkyl group, each R ¹⁰ is a linear or branched C _2-4 alkylene group, r is 1, each s is 0, and each. The curable composition according to claim 6 , wherein t is an integer of 0 to 5, respectively. The curing according to any one of claims 1 to 7 , wherein the ratio of the first monofunctional (meth) acrylate is 10 to 120 parts by weight with respect to 100 parts by weight of the first polyfunctional (meth) acrylate. Sex composition. The ratio of the total amount of the first ring-aggregated polycyclic aromatic monofunctional (meth) acrylate (B) and the first monocyclic aromatic monofunctional (meth) acrylate (C) is the first condensation polymorphism. The curable composition according to any one of claims 4 to 8, which is 1 to 100 parts by weight with respect to 100 parts by weight of the cyclic aromatic monofunctional (meth) acrylate (A). The proportion of the second polyfunctional (meth) acrylate is 5 to 30 parts by weight based on 100 parts by weight of the total of the first polyfunctional (meth) acrylate and the first monofunctional (meth) acrylate. The curable composition according to any one of claims 6 to 9. The proportion of the second monofunctional (meth) acrylate is 1 to 25 parts by weight based on 100 parts by weight of the total amount of the first polyfunctional (meth) acrylate and the second monofunctional (meth) acrylate. The curable composition according to any one of claims 1 to 10. The curable composition according to any one of claims 1 to 11 , further comprising a polymerization initiator. A cured product obtained by curing the curable composition according to any one of claims 1 to 12.