JPWO2011093089A1 - Optical disc having organic dye recording layer and ultraviolet curable resin composition therefor - Google Patents

Abstract

(Meth) acrylate having an interface layer on the organic dye recording layer, and having a structure represented by (A) the following formula (1) (wherein n represents an integer of 1 to 10) on the interface layer. (Excluding urethane acrylate), (B) a photopolymerization initiator, preferably an optical disc having a cured product layer of an ultraviolet curable resin composition containing a methacrylate (C) other than (A), and The present invention relates to an ultraviolet curable resin composition for optical discs, and the optical discs have excellent recording signal characteristics and durability.

Description

  The present invention relates to an optical disc having an organic dye recording layer and an ultraviolet curable resin composition useful for the optical disc.

  Optical disc recording media currently in practical use include CD-R, CD-RW, and 0.6 mm, in which a recording layer, a reflective layer, and a protective layer made of an ultraviolet curable resin are laminated on a 1.2 mm polycarbonate substrate. There are DVD-R, DVD + R, DVD-RW, DVD + RW, and DVD-RAM in which a polycarbonate substrate of 0.6 mm and a 0.6 mm polycarbonate substrate having a recording layer and a reflective layer are bonded together with an ultraviolet curable resin.

  In recent years, a Blu-ray Disc (BD-R) having a recording capacity about five times that of a single-layer DVD has been put on the market. For example, in a Blu-ray disc, a reflective layer, a recording layer, and an interface layer (also referred to as a dielectric layer) are formed on a 1.1 mm transparent or opaque plastic substrate, and then approximately about the interface layer. The disc has a structure in which a 0.1 mm light transmission layer (also referred to as a cover layer) is laminated and records / reproduces through the light transmission layer. An organic dye or an inorganic compound is used for the recording layer, and a light-transmitting inorganic compound is used for the interface layer. Moreover, the hardened | cured material layer of an ultraviolet curable resin is used as a light transmissive layer.

  In a Blu-ray disc having a recording layer made of an organic dye, recording is performed by irradiating the recording layer with laser light and utilizing deformation due to a volume change of the organic dye. For the purpose of assisting the volume change of the dye and obtaining excellent recording signal characteristics (for example, jitter characteristics), a light-transmitting cover layer is formed of a curable resin, and the elastic modulus of the interface region facing the recording layer is 25 ° C. 40 MPa or less, an optical information recording medium (Patent Document 1), and an optical information recording medium having a cured resin layer having an elastic modulus of 34 to 96 MPa at 25 ° C. on a recording layer of an organic dye (Patent Document 1) Document 2) has been proposed. However, these documents do not disclose at all what kind of composition the cured layer of the resin composition can achieve such an elastic modulus.

  In addition, as an evaluation index for the reliability of the optical disk recording medium described above, an environmental test is performed in which the optical disk recording medium is left for 100 hours in an environment of temperature 80 ° C./relative humidity 80% RH. In order to keep the degree of deterioration of the recording signal before and after this environmental test within a predetermined range, both the storage elastic modulus at 5 ° C. and 55 ° C. on the interface layer is 100 MPa or less, and the storage elastic modulus at 55 ° C. and 55 The ratio of the storage elastic modulus at 0 ° C. is 10 or less, a curable resin containing a flexible urethane acrylate as a main component and a monofunctional acrylate as a diluent, or a urethane acrylate as a main component and a monofunctional acrylate as a diluent And the technique (patent document 3) which forms the hardened | cured material layer of curable resin containing polyfunctional acrylate is proposed. However, as described above, this document only discloses that the main component is urethane acrylate, and monofunctional acrylate alone or a combination of monofunctional acrylate and polyfunctional acrylate as a diluent. There is no disclosure about the specific component composition.

JP 2008-123631 A JP 2008-269703 A JP 2009-026379 A

  An object of the present invention is to provide an ultraviolet curable resin composition capable of imparting excellent recording signal characteristics and durability in an optical disk having an organic dye recording layer.

  As a result of intensive studies to solve the above problems, the present inventors have found that an ultraviolet curable resin composition containing a (meth) acrylate having a specific structure is excellent in an optical disc having an organic dye recording layer. The inventors have found that recording signal characteristics and durability are exhibited, and have completed the present invention.

（式中、ｎは１〜１０の整数を示す）
及び、
（Ｂ）光重合開始剤、
を含有する紫外線硬化型樹脂組成物（以下単に樹脂組成物という）の硬化物層を有する光ディスク。
（２） 式（１）で示される構造を有する（メタ）アクリレート（Ａ）が、カプロラクトン変性ヒドロキシエチル（メタ）アクリレート、カプロラクトン変性ヒドロキシブチル（メタ）アクリレート、カプロラクトン変性ヒドロキシピバリン酸ネオペンチルグリコールジ（メタ）アクリレート、カプロラクトン変性トリス（アクリロキシエチル）イソシアヌレート及びカプロラクトン変性ジペンタエリスリトールヘキサ（メタ）アクリレートからなる群から選ばれる少なくとも一種である上記（１）に記載の光ディスク。
（３） 前記樹脂組成物が、更に、（Ａ）以外の（メタ）アクリレート（Ｃ）を含有する紫外線硬化型樹脂組成物である上記（１）又は（２）に記載の光ディスク。That is, the present invention relates to the following (1) to (32).
(1) Having an interface layer on the organic dye recording layer,
(A) (meth) acrylate having a structure represented by the following formula (1) (excluding urethane (meth) acrylate)

(In the formula, n represents an integer of 1 to 10)
as well as,
(B) a photopolymerization initiator,
An optical disc having a cured product layer of an ultraviolet curable resin composition (hereinafter, simply referred to as a resin composition) containing benzene.
(2) The (meth) acrylate (A) having the structure represented by the formula (1) is converted into caprolactone modified hydroxyethyl (meth) acrylate, caprolactone modified hydroxybutyl (meth) acrylate, caprolactone modified hydroxypivalate neopentyl glycol di ( The optical disk according to (1), which is at least one selected from the group consisting of (meth) acrylate, caprolactone-modified tris (acryloxyethyl) isocyanurate, and caprolactone-modified dipentaerythritol hexa (meth) acrylate.
(3) The optical disk according to (1) or (2), wherein the resin composition is an ultraviolet curable resin composition further containing (meth) acrylate (C) other than (A).

(4) Any one of said (1)-(3) which contains 20-95weight% of (meth) acrylate (A) which has a structure shown by Formula (1) with respect to the said whole resin composition. The optical disc described in 1.
(5) The group which the said (meth) acrylate (C) consists of a polyester polyol or polyether polyol, the urethane acrylate which is a reaction material of polyisocyanate and 2-hydroxyethyl acrylate, and a polyethylene oxide modified bisphenol A type diacrylate. The optical disk according to (3) or (4), wherein the optical disk is at least one selected from:
(6) As said (meth) acrylate (C), from the group which consists of the (meth) acrylate monomer (c-3a) of the following (I) group, and the (meth) acrylate monomer (c-3b) of the following (II) group. The optical disc according to (3) or (4), which contains at least one selected from the above;
(I) Group (c-3a):
(I) C5-C18 alkyl (meth) acrylate or C7-18 alkylene glycol di (meth) acrylate;
(Ii) propylene oxide modified mono- or di (meth) acrylate;
(Iii) polyethylene oxide modified bisphenol A type di (meth) acrylate;
(Iv) polyethylene oxide-modified phenol acrylate; or (v) (meth) acrylate having a polytetramethylene glycol structure;
(II) Group (c-3b):
Dicyclopentenyloxyethyl (meth) acrylate (or dicyclopentadieneoxyethyl (meth) acrylate), 1,6-hexanediol di (meth) acrylate, dipropylene glycol di (meth) acrylate, or tripropylene glycol di (meta) Acrylate

（式中、ｎは１〜１０の整数を示す。）
及び、
（Ｂ）光重合開始剤、
を含有する紫外線硬化型樹脂組成物を塗布し、次いで、該塗布膜に、活性エネルギー線を照射して、硬化物層を形成する工程を含む光ディスクの製造方法。
（１４） 紫外線硬化型樹脂組成物が、更に、（Ａ）以外の（メタ）アクリレート（Ｃ）を含有する紫外線硬化型樹脂組成物である上記（１３）に記載の光ディスクの製造方法。(7) The optical disk according to (6), wherein the (meth) acrylate (C) includes the (meth) acrylate monomer (c-3a) of the group (I).
(8) The optical disk according to (7), which contains a C5-C18 alkyl (meth) acrylate as the (meth) acrylate monomer (c-3a) of the group (I).
(9) The optical disk according to (6), wherein the (meth) acrylate (C) includes the (meth) acrylate monomer (c-3b) in the group (II).
(10) The optical disc according to any one of (3) to (9), which includes urethane (meth) acrylate (C-2) as the (meth) acrylate (C).
(11) The above (10), wherein the urethane (meth) acrylate (C-2) is a urethane (meth) acrylate obtained by reaction with poly C2 to C6 alkylene glycol, isophorone diisocyanate and hydroxy C2 to C4 (meth) acrylate. ) Optical disc.
(12) The optical disc according to any one of (1) to (11), wherein the resin composition further includes a hindered amine compound (D).
(13) At least on the interface layer of the optical disk substrate having the interface layer on the organic dye recording layer,
(A) (meth) acrylate having a structure represented by the following formula (1),

(In the formula, n represents an integer of 1 to 10.)
as well as,
(B) a photopolymerization initiator,
A method for producing an optical disk, comprising a step of applying a UV-curable resin composition containing, and then irradiating the coating film with active energy rays to form a cured product layer.
(14) The method for producing an optical disk according to (13), wherein the ultraviolet curable resin composition is an ultraviolet curable resin composition further containing (meth) acrylate (C) other than (A).

（式中、ｎは１〜１０の整数を示す。）
及び、
（Ｂ）光重合開始剤、
を含有する光ディスク用紫外線硬化型樹脂組成物。
（１６） 式（１）で示される構造を有する（メタ）アクリレート（Ａ）が、カプロラクトン変性ヒドロキシエチル（メタ）アクリレート、カプロラクトン変性ヒドロキシブチル（メタ）アクリレート、カプロラクトン変性ヒドロキシピバリン酸ネオペンチルグリコールジ（メタ）アクリレート、カプロラクトン変性トリス（アクリロキシエチル）イソシアヌレート及びカプロラクトン変性ジペンタエリスリトールヘキサ（メタ）アクリレートからなる群から選ばれる少なくとも一種である上記（１５）に記載の光ディスク用紫外線硬化型樹脂組成物。
（１７） 更に、上記（Ａ）以外の（メタ）アクリレート（Ｃ）を含有する上記（１５）又は（１６）に記載の光ディスク用紫外線硬化型樹脂組成物。
（１８） 式（１）で示される構造を有する（メタ）アクリレート（Ａ）を、前記樹脂組成物全体に対して２０〜９５重量％含有する上記（１５）〜（１７）の何れか一項に記載の光ディスク用紫外線硬化型樹脂組成物。
（１９） 前記（メタ）アクリレート（Ｃ）が、ポリエステルポリオール又はポリエーテルポリオールと、ポリイソシアネート及び２−ヒドロキシエチルアクリレートとの反応物であるウレタンアクリレート、及びポリエチレンオキサイド変性ビスフェノールＡ型ジアクリレートからなる群から選ばれる少なくとも一種である上記（１７）又は（１８）に記載の光ディスク用紫外線硬化型樹脂組成物。(15) (A) (meth) acrylate having a structure represented by the following formula (1) (however, excluding urethane (meth) acrylate)

(In the formula, n represents an integer of 1 to 10.)
as well as,
(B) a photopolymerization initiator,
An ultraviolet curable resin composition for optical discs containing
(16) The (meth) acrylate (A) having the structure represented by the formula (1) is converted into caprolactone-modified hydroxyethyl (meth) acrylate, caprolactone-modified hydroxybutyl (meth) acrylate, caprolactone-modified hydroxypivalate neopentyl glycol di ( The ultraviolet curable resin composition for optical disks according to (15), which is at least one selected from the group consisting of (meth) acrylate, caprolactone-modified tris (acryloxyethyl) isocyanurate, and caprolactone-modified dipentaerythritol hexa (meth) acrylate. .
(17) The ultraviolet curable resin composition for optical disks according to (15) or (16), further comprising (meth) acrylate (C) other than (A).
(18) Any one of the above (15) to (17), wherein the (meth) acrylate (A) having a structure represented by the formula (1) is contained in an amount of 20 to 95% by weight based on the entire resin composition. An ultraviolet curable resin composition for optical discs as described in 1.
(19) The group in which the (meth) acrylate (C) is a urethane acrylate that is a reaction product of a polyester polyol or a polyether polyol, a polyisocyanate, and 2-hydroxyethyl acrylate, and a polyethylene oxide-modified bisphenol A type diacrylate. The ultraviolet curable resin composition for optical disks according to the above (17) or (18), which is at least one selected from:

(20) From the group consisting of (meth) acrylate monomer (c-3a) of the following (I) group and (meth) acrylate monomer (c-3b) of the following (II) group as the (meth) acrylate (C). The ultraviolet curable resin composition for optical discs according to any one of (17) to (19), which contains at least one selected from the above;
(I) Group (c-3a):
(I) C5-C18 alkyl (meth) acrylate or C7-18 alkylene glycol di (meth) acrylate;
(Ii) propylene oxide modified mono- or di (meth) acrylate;
(Iii) polyethylene oxide modified bisphenol A type di (meth) acrylate;
(Iii) polyethylene oxide modified phenol acrylate;
(Iv) (meth) acrylates having a polytetramethylene glycol structure;
(II) Group (c-3b):
Dicyclopentenyloxyethyl (meth) acrylate (or dicyclopentadieneoxyethyl (meth) acrylate), 1,6-hexanediol di (meth) acrylate, dipropylene glycol di (meth) acrylate, or tripropylene glycol di (meta) ) Acrylate.
(21) The ultraviolet curable resin composition for an optical disc according to (20), which contains (meth) acrylate monomer (c-3a) of group (I) as (meth) acrylate (C).
(22) The ultraviolet curable resin composition for an optical disc according to (21), which contains a C5-C18 alkyl (meth) acrylate as the (meth) acrylate monomer (c-3a) of the group (I).
(23) The content of the (meth) acrylate monomer (c-3a) in the group (I) is 20 to 60% by weight with respect to the total amount of the resin composition, as described in (20) or (21) above An ultraviolet curable resin composition for optical disks.
(24) The ultraviolet ray for an optical disc according to any one of (20) to (23), wherein the (meth) acrylate (C) includes the (meth) acrylate monomer (c-3b) of the group (II). A curable resin composition.

(25) The ultraviolet curable resin composition for optical disks according to any one of (17) to (24), wherein urethane (meth) acrylate (C-2) is contained as the (meth) acrylate (C).
(26) The above (25), wherein the urethane (meth) acrylate (C-2) is a urethane (meth) acrylate obtained by reaction with poly C2 to C6 alkylene glycol, isophorone diisocyanate and hydroxy C2 to C4 (meth) acrylate. ) UV curable resin composition for optical discs.
(27) As component (C), C5-C18 alkyl (meth) acrylate, polyethylene oxide 5-15 mol modified bisphenol A type di (meth) acrylate, dicyclopentadieneoxyethyl (meth) acrylate and polypropylene glycol di (meth) It contains at least one selected from the group consisting of acrylates, and the content thereof is 50% to 100% with respect to the total amount of component (C). The ultraviolet curable resin composition for optical disks described.
(28) As the component (A) and the (meth) acrylate (C), urethane (meth) acrylate (C-2), the (meth) acrylate monomer (c-3a) of the group (I) and the above ( II) containing at least one selected from the group consisting of (meth) acrylate monomers (c-3b) of group (A), (C-2), (c-3a) and (c-3b) The ultraviolet curable resin composition for optical disks according to any one of (17) to (27), wherein the total amount of the components is 70 to 99% by weight based on the total amount of the resin composition.
(29) The above (28) containing at least one selected from the group consisting of the (meth) acrylate monomer (c-3a) of the (I) group and the (meth) acrylate monomer (c-3b) of the (II) group. ) UV curable resin composition for optical discs.
(30) When urethane (meth) acrylate (C-2) is included, (i) component (A) is caprolactone-modified hydroxyethyl (meth) acrylate, or (ii) (I) of (I) group The ultraviolet curable resin composition for optical disks according to the above (28), which comprises any one of (meth) acrylate monomers (c-3a).
(31) The ultraviolet curable resin composition for optical disks according to any one of (15) to (30), further comprising a hindered amine compound (D).
(32) The ultraviolet curable resin composition for optical disks according to any one of (17) to (31), wherein the cured product has an elastic modulus at 25 ° C. of 0.01 to 9.5 MPa when cured. .

    The optical disc of the present invention having the cured layer of the ultraviolet curable resin composition of the present invention on the interface layer (dielectric layer) directly laminated on the organic dye recording layer has a jidder value before and after the durability test. Even when used for a long time under high temperature and high humidity, the reliability of recording and reproduction is high, and the production is easy.

  The ultraviolet curable resin composition of the present invention (hereinafter also referred to as the resin composition of the present invention) used for the optical disk of the present invention contains a (meth) acrylate having a specific structure and a photopolymerization initiator.

The (meth) acrylate (A) having the structure represented by the formula (1) contained in the resin composition of the present invention is preferably a monomer. In, it can be used without limitation. A preferable value of n is 2 to 7, more preferably 4 to 6.
The (meth) acrylate (A) having the structure of the formula (1) used in the present invention does not include an oligomer having the caprolactone-modified structure, for example, a urethane acrylate having a caprolactone-modified structure.
Specific compounds of the (meth) acrylate (A) having the structure of the above formula (1) include, for example, caprolactone-modified hydroxyethyl (meth) acrylate (for example, SR-495 manufactured by Sartomer Co., Ltd.), caprolactone-modified hydroxybutyl (meta ) Acrylate, caprolactone-modified hydroxypivalate neopentyl glycol di (meth) acrylate (for example, Kayrad ^RTM HX-220, HX-620 manufactured by Nippon Kayaku Co., Ltd.), caprolactone-modified tris (acryloxyethyl) isocyanurate (for example, new Nakamura Chemical Co., Ltd. NK Esters A-9300-1CL, A-9300-3CL, A-9300-6CL) and caprolactone-modified dipentaerythritol hexa (meth) acrylate, for example, Nippon Kayaku Co., Ltd. Kaya Head ^{RTM DPCA-20, DPCA-30} , DPCA-60, DPCA-120) are preferred.

  The content of the component (A) in the ultraviolet curable resin composition is usually 10 to 95% by weight, preferably 20 to 95% by weight, more preferably 30 to 95% by weight, based on the total amount of the resin composition. More preferably, it is 40 to 95% by weight. In some cases, 20 to 80% by weight is also preferred. If the amount is too small, the change in the volume of the dye cannot be assisted, and the jitter value (%), which is an indicator of the recording signal characteristics, deteriorates.

The photopolymerization initiator (B) contained in the composition of the present invention is not particularly limited. For example, 1-hydroxycyclohexyl phenyl ketone (Irgacure ^RTM 184; manufactured by Ciba Specialty Chemicals), 2-hydroxy-2-methyl- [4- (1-methylvinyl) phenyl] propanol oligomer (ONE-Rifened), 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one (Irgacure ^RTM 2959; manufactured by Ciba Specialty Chemicals), 2-hydroxy-1- {4- [4- (2-hydroxy-2-methyl-propionyl) -benzyl] -phenyl} -2-methyl-propan-1-one (Irgacure ^RTM 127; manufactured by Ciba Specialty Chemicals), 2,2-dimethoxy-2 - phenyl acetophenone (Irgacure ^RTM 651 Manufactured by Ciba Specialty Chemicals), 2-hydroxy-2-methyl-1-phenyl - propane-1-one (Darocure ^RTM 1173; manufactured by Ciba Specialty Chemicals), 2-methyl-1- [4- (methylthio) Phenyl] -2-morpholinopropan-1-one (Irgacure ^RTM 907; manufactured by Ciba Specialty Chemicals), 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one, 2-chloro Thioxanthone, 2,4-dimethylthioxanthone, 2,4-diisopropylthioxanthone, isopropylthioxanthone, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, bis (2 May be mentioned 6-dimethoxybenzoyl) -2,4,4-trimethyl pentyl phosphine oxide and the like.
In the above, the superscript RTM indicates a registered trademark (the same applies hereinafter).

  In the ultraviolet curable resin composition of this invention, these (B) components can be used 1 type or in mixture of 2 or more types by arbitrary ratios. The content of the component (B) in the ultraviolet curable resin composition is usually 0.5 to 20% by weight, preferably 1 to 20% by weight, more preferably 1 to 10%, based on the total amount of the resin composition. % By weight. In the following, “%” represents “% by weight” unless otherwise specified.

  Furthermore, amines that can serve as photopolymerization initiation assistants can be used in combination with the photopolymerization initiator. Examples of amines that can be used include benzoic acid 2-dimethylaminoethyl ester, dimethylaminoacetophenone, p-dimethylaminobenzoic acid ethyl ester, and p-dimethylaminobenzoic acid isoamyl ester. When using a photopolymerization initiation assistant such as the amines, the content in the adhesive resin composition of the present invention is usually 0.005 to 5% by weight, preferably based on the total amount of the resin composition. 0.01 to 3% by weight.

In the resin composition of the composition of the present invention, it is usually preferable to contain (meth) acrylate (C) other than the component (A). Examples of the (meth) acrylate (C) include (meth) acrylate having one or more (meth) acryloyl groups, usually 1 to 6. Although the kind is not specifically limited, (C-1) epoxy (meth) acrylate (henceforth (C-1) component) and / or (C-2) urethane (meth) acrylate (henceforth (C-2) component) In addition, (C-3) (meth) acrylate monomer (hereinafter also referred to as (C-3) component) other than the components (A), (C-1) and (C-2) described above. ) Etc. can be used.
In the present invention, (meth) acrylate means methacrylate or acrylate.

The epoxy (meth) acrylate (C-1) that can be used in the present invention has a function of improving curability and improving the hardness and curing speed of a cured product.
In the present invention, the epoxy (meth) acrylate (C-1) can be obtained by reacting a glycidyl ether type epoxy compound with (meth) acrylic acid.
Examples of the glycidyl ether type epoxy compound for obtaining the epoxy (meth) acrylate (C-1) include diglycidyl ethers of glycols described below.
As the glycol for the diglycidyl ether, bisphenol A or its alkylene oxide adduct, bisphenol F or its alkylene oxide adduct, hydrogenated bisphenol A or its alkylene oxide adduct, hydrogenated bisphenol F or its alkylene oxide addition Body, ethylene glycol, propylene glycol, neopentyl glycol, butanediol, hexanediol, cyclohexanedimethanol, polypropylene glycol and the like.

  In the epoxy (meth) acrylate (C-1), these glycidyl ether type epoxy compounds and (meth) acrylic acid are reacted, for example, under the following conditions, and the epoxy group of the epoxy compound is reacted with (meth) acrylic acid. It is obtained by ring-opening addition of a carboxyl group.

  (Meth) acrylic acid is reacted at a ratio of 0.9 to 1.5 mol, more preferably 0.95 to 1.1 mol, per 1 equivalent of the epoxy group of the glycidyl ether type epoxy compound. The reaction temperature is preferably 80 to 120 ° C., and the reaction time is about 10 to 35 hours. In order to accelerate the reaction, it is preferable to use a catalyst such as triphenylphosphine, 2,4,6-tris (dimethylaminomethyl) phenol (TAP), triethanolamine or tetraethylammonium chloride. Further, in order to prevent polymerization during the reaction, for example, paramethoxyphenol, methylhydroquinone or the like can be used as a polymerization inhibitor.

  In the present invention, the epoxy (meth) acrylate (C-1) is more preferably a bisphenol A type epoxy (meth) acrylate obtained from a bisphenol A type epoxy compound. In the present invention, the molecular weight of the epoxy (meth) acrylate (C-1) is preferably 500 to 10,000.

The urethane (meth) acrylate (C-2) is obtained by reacting a polyhydric alcohol, a polyisocyanate, and a hydroxy (meth) acrylate compound. More specifically, it can be obtained by reacting a polyhydric alcohol and polyisocyanate and reacting the resulting urethane oligomer with a hydroxy (meth) acrylate compound.
In the urethane (meth) acrylate (C-2), the viscosity adjustment of the resin composition of the present invention and the adjustment of the elastic modulus in the cured product, and the cured product layer of the resin composition were used as a light transmission layer. Sometimes there is a function to improve mechanical properties (reduce warpage, distortion, etc.).

Examples of the polyhydric alcohol include the following polyhydric alcohols.
(I) Neopentyl glycol, 3-methyl-1,5-pentanediol, ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, trimethylolpropane, pentaerythritol, tricyclodecane dimethylol Aliphatic polyhydric alcohols such as bis- [hydroxymethyl] -cyclohexane, preferably 2 to 10 carbon aliphatic polyhydric alcohols.
(Ii) A polyester polyol obtained by reacting one of the aliphatic polyhydric alcohols described in (i) above with a polybasic acid.
Examples of the polybasic acid include succinic acid, phthalic acid, hexahydrophthalic anhydride, terephthalic acid, adipic acid, azelaic acid, and tetrahydrophthalic anhydride.
(Iii) Caprolactone alcohol obtained by reaction of polyhydric alcohol and ε-caprolactone.
(Iv) Polycarbonate polyol. For example, polycarbonate diol obtained by reaction of 1,6-hexanediol and diphenyl carbonate.
(V) Polyether polyol. For example, poly C2-C4 alkylene glycol such as polyethylene glycol, polypropylene glycol or polytetramethylene glycol, ethylene oxide modified bisphenol A, and the like.
Among these, as the polyhydric alcohol, polyether polyol or polyester polyol is preferable. These average molecular weights are preferably about 200 to 8000, more preferably about 200 to 3000, still more preferably about 300 to 1800, and most preferably about 400 to 1500. More preferred is poly C2-C4 alkylene glycol.
Examples of the organic polyisocyanate used for the synthesis of urethane (meth) acrylate (C-2) include isophorone diisocyanate, hexamethylene diisocyanate, tolylene diisocyanate, xylene diisocyanate, diphenylmethane-4,4′-diisocyanate, or dicyclopentanyl. Diisocyanate etc. are mentioned. Of these, isophorone diisocyanate is more preferred.

  Examples of the hydroxy (meth) acrylate compound used for the synthesis of urethane (meth) acrylate (C-2) include hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, and dimethylolcyclohexyl. Examples thereof include hydroxy C2-C8 aliphatic hydrocarbon (meth) acrylate such as mono (meth) acrylate and hydroxycaprolactone (meth) acrylate. Among these, preferred hydroxy (meth) acrylate is hydroxy C2-C8 aliphatic hydrocarbon (meth) acrylate, more preferably hydroxy C2-C4 alkyl (meth) acrylate, and most preferably hydroxyethyl (meth) acrylate. is there.

The reaction is performed as follows, for example. That is, an organic polyisocyanate is mixed with a polyhydric alcohol per equivalent of the hydroxyl group so that the isocyanate group is preferably 1.1 to 2.0 equivalents, and the reaction temperature is preferably 70 to 90 ° C. Synthesize oligomers. Next, the hydroxy (meth) acrylate compound is mixed so that the hydroxyl group is preferably 1 to 1.5 equivalents per equivalent of isocyanate group of the urethane oligomer, and reacted at 70 to 90 ° C. to obtain the target urethane (meta ) Acrylate can be obtained.
As a preferred urethane (meth) acrylate (C-2), a polyester polyol or a polyether polyol is used as a polyhydric alcohol, and a urethane (meth) obtained using 2-hydroxyethyl (meth) acrylate as a hydroxy (meth) acrylate. It is an acrylate, More preferably, the urethane acrylate (c-2a) obtained from three of polyester polyol or polyether polyol, polyisocyanate, and 2-hydroxyethyl acrylate can be mentioned.
A urethane (meth) acrylate obtained using a polyester polyol or polyether polyol having a molecular weight of about 200 to 3000 (preferably a molecular weight of 300 to 1800) is also one of the preferred urethane (meth) acrylates (C-2). .
Further, in some cases, urethane obtained by reaction with poly C2-C6 alkylene glycol of about 300-1800, more preferably C3-C5 alkylene glycol of molecular weight of about 300-1800, isophorone diisocyanate and hydroxy C2-C4 (meth) acrylate. (Meth) acrylate is also a preferred urethane (meth) acrylate (C-2).
Moreover, it is also possible to obtain from the market as UX-0937: polyether urethane acrylate (manufactured by Nippon Kayaku Co., Ltd.). The molecular weight of the urethane (meth) acrylate (C-2) is preferably about 400 to 10,000.
In the resin composition of the present invention, an embodiment containing urethane (meth) acrylate (C-2) is one of preferred embodiments, and an embodiment containing urethane (meth) acrylate (C-2) alone as the component (C). It may also be an embodiment used in combination with other component (C).
In the resin composition of the present invention, when the urethane (meth) acrylate (C-2) is contained, the content is larger than 0%, usually 50% or less, preferably 40% or less, with respect to the total amount of the resin composition. More preferably, it is 30% or less, and may be 15% or less in some cases.

The (meth) acrylate monomer (C-3) used as the (meth) acrylate (C) other than the component (A), the component (C-1) and the component (C-2) is not particularly limited and is monofunctional as described below. Or a polyfunctional (preferably 2-6 functional) (meth) acrylate can be mentioned.
For example, as the monofunctional (meth) acrylate ((meth) acrylate having one (meth) acryloyl group) in the component (C-3), the following compounds can be specifically exemplified.
(I) Isooctyl (meth) acrylate, isoamyl (meth) acrylate, lauryl (meth) acrylate, isodecyl (meth) acrylate, stearyl (meth) acrylate, cetyl (meth) acrylate, isomyristyl (meth) acrylate, tridecyl (meth) C5-C18 (preferably C7-C18) alkyl (meth) acrylate such as acrylate;
(Ii) Tricyclodecane (meth) acrylate, isobornyl (meth) acrylate, dicyclopentenyl acrylate (for example, FANCYL FA-511A manufactured by Hitachi Chemical Co., Ltd.), dicyclopentenyloxyethyl acrylate (dicyclopentadieneoxyethyl (meth) Acrylate) (for example, FANCYL FA-512A manufactured by Hitachi Chemical Co., Ltd.), dicyclopentenyloxy methacrylate (for example, FANCYL FA-512M manufactured by Hitachi Chemical Co., Ltd.), dicyclopentanyl acrylate (for example, Hitachi Chemical Co., Ltd.) FANCYL FA-513A manufactured by company), dicyclopentanyl methacrylate (for example, FANCRRYL FA-513M manufactured by Hitachi Chemical Co., Ltd.), 1-adamantyl acrylate (for example, Kako Kosan Co., Ltd. Adamantate AA), 2-methyl-2-adamantyl acrylate (eg, Idemitsu Kosan Co., Ltd. Adamantate MA), 2-ethyl-2-adamantyl acrylate (eg, Idemitsu Kosan Co., Ltd. Adamantate EA), 1 A (meth) acrylate compound having a C7 to C10 aliphatic ring such as adamantyl methacrylate (for example, Adamantate AM manufactured by Idemitsu Kosan Co., Ltd.);

(Iii) Polypropylene glycol (meth) acrylate, polypropylene oxide modified nonylphenyl (meth) acrylate, polypropylene oxide modified (meth) acrylate such as methoxytripropylene glycol (meth) acrylate, or ethoxydiethylene glycol (meth) acrylate, ethylene oxide modified C2 or C3 alkylene oxides such as ethylene oxide modified (meth) acrylates such as phenoxylated phosphoric acid (meth) acrylate, ethylene oxide modified butoxylated phosphoric acid (meth) acrylate and ethylene oxide modified octyloxylated phosphoric acid (meth) acrylate Modified (meth) acrylate compounds;
(Iv) Further, monofunctional (meth) acrylates other than those described above, for example, benzyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, morpholine (meth) acrylate, phenylglycidyl (meth) acrylate, 2-hydroxypropyl A (meth) acrylate etc. can be mentioned.
The (meth) acrylate monomer having one (meth) acryloyl group is a mechanical property (suppression of warpage, distortion, etc.) of an optical disc (for example, a Blu-ray disc) in which the ultraviolet curable resin composition of the present invention is formed as a light transmission layer. It has the function to improve.
For example, in an optical disc having an organic dye recording layer (for example, a Blu-ray disc), the ultraviolet curable resin composition of the present invention is formed on the interface layer so as to be in direct contact with the interface layer formed on the organic dye recording layer. The above function is exhibited in an optical disc in which a cured product layer of a product is laminated.
Among the above, C5-C18 (preferably C7-C18) alkyl (meth) acrylate has a function of lowering the elastic modulus of the cured product of the resin composition of the present invention, and if necessary, the resin of the present invention. The cured product of the composition can be used to obtain a preferred elastic modulus.

Examples of the polyfunctional (meth) acrylate monomer in the (meth) acrylate monomer (C-3) include (meth) acrylate monomers having 2 to 6 (meth) acryloyl groups described below.
(I) (meth) acrylate monomer having two (meth) acryloyl groups as component (C-3);
Cyclohexane-1,4-dimethanol di (meth) acrylate, cyclohexane-1,3-dimethanol di (meth) acrylate, tricyclodecane dimethylol di (meth) acrylate (for example, KAYARAD R-684, manufactured by Nippon Kayaku Co., Ltd.) , Tricyclodecane dimethylol diacrylate, etc.), dioxane glycol di (meth) acrylate (for example, KAYARAD R-604, dioxane glycol diacrylate etc., manufactured by Nippon Kayaku Co., Ltd.), neopentyl glycol di (meth) acrylate Dicyclopentanyl di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, ethylene oxide modified 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, Lucylene oxide modified neopentyl glycol di (meth) acrylate, hydroxypivalic acid neopentyl glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, (poly) ethylene oxide or (poly) (Poly) alkylene oxide modified bisphenol A type di (meth) acrylate such as propylene oxide and ethylene oxide modified phosphoric acid di (meth) acrylate.
Among the above, polyethylene oxide-modified bisphenol A type di (meth) acrylate is preferable, and in some cases, ethylene oxide 5 to 15 mol modified bisphenol A type di (meth) acrylate is more preferable.
In addition, alkylene having 7 to 18 carbon atoms such as 2-ethyl-2-butyl-propanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate and 1,10-decandiol di (meth) acrylate Also preferred are di (meth) acrylates of glycols having groups.
These have a function of lowering the elastic modulus of the cured product of the resin composition, and can be used as needed to make the cured product of the resin composition of the present invention have a preferable elastic modulus.

(Ii) (meth) acrylate monomer having three (meth) acryloyl groups as component (C-3);
Trimethylolpropane tri (meth) acrylate, trimethyloloctane tri (meth) acrylate, trimethylolpropane polyethoxytri (meth) acrylate, trimethylolpropane polypropoxytri (meth) acrylate, trimethylolpropane polyethoxypolypropoxytri (meta) ) Acrylate, tris [(meth) acryloyloxyethyl] isocyanurate, pentaerythritol tri (meth) acrylate, ethylene oxide modified trimethylolpropane tri (meth) acrylate, propylene oxide modified trimethylolpropane tri (meth) acrylate, etc. Can be mentioned.

(Iii) (meth) acrylate monomer having four (meth) acryloyl groups as component (C-3);
Examples include pentaerythritol polyethoxytetra (meth) acrylate, pentaerythritol polypropoxytetra (meth) acrylate, pentaerythritol tetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, dipentaerythritol tetra (meth) acrylate and the like. it can.
(Iv) a (meth) acrylate monomer having five (meth) acryloyl groups as the component (C-3);
Examples thereof include dipentaerythritol penta (meth) acrylate.
(V) (meth) acrylate monomer having 6 (meth) acryloyl groups as component (C-3);
Dipentaerythritol hexa (meth) acrylate etc. can be mentioned. The (meth) acrylate monomer that can be used in the present invention may be a polyfunctional monomer having 7 or more (meth) acryloyl groups.

Among the components (C-3) ((meth) acrylate monomers) listed above, the (meth) acrylate monomer (c-3a) described in the following group (I) is used together with the component (A): This may improve the recording characteristics of the obtained optical disc (for example, a Blu-ray disc), and is a preferred (meth) acrylate monomer.
(I) Group:
(I) Isooctyl (meth) acrylate, isoamyl (meth) acrylate, lauryl (meth) acrylate, isodecyl (meth) acrylate, stearyl (meth) acrylate, cetyl (meth) acrylate, isomyristyl (meth) acrylate and tridecyl (meth) C5-C18 alkyl (meth) acrylates such as acrylate, and 2-ethyl-2-butyl-propanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate and 1,10-decanediol di ( C7-18 alkylene glycol di (meth) acrylate such as (meth) acrylate;
(Ii) Polypropylene glycol (meth) acrylate, polypropylene glycol di (meth) acrylate, polypropylene oxide modified nonylphenyl (meth) acrylate, polypropylene oxide modified neopentyl glycol di (meth) acrylate, polypropylene oxide modified 1,6-hexanediol di Propylene oxide modified mono- or di (meth) acrylate such as (meth) acrylate, polypropylene oxide modified bisphenol A type di (meth) acrylate and methoxytripropylene glycol (meth) acrylate;
(Iii) Polyethylene oxide modified bisphenol A type di (meth) acrylate, preferably polyethylene oxide 5-15 mol modified bisphenol A type di (meth) acrylate, more preferably polyethylene oxide 10 mol modified bisphenol A type di (meth) acrylate:

(Iv) polyethylene oxide-modified phenol acrylates such as ethylene oxide 2 mol modified phenol acrylate, ethylene oxide 6 mol modified phenol acrylate, preferably ethylene oxide 2-10 mol modified phenol acrylate;
(V) Poly (ethylene glycol-tetramethylene glycol) diacrylate, poly (propylene glycol-tetramethylene glycol) diacrylate, polytetramethylene glycol diacrylate, poly (ethylene glycol-tetramethylene glycol) dimethacrylate, poly (propylene glycol) -(Meth) acrylate having a polytetramethylene glycol structure such as tetramethylene glycol) dimethacrylate or polytetramethylene glycol dimethacrylate, preferably polytetramethylene glycol di (meth) acrylate, or poly (C2-C3 alkylene glycol) Polytetramethylene glycol) di (meth) acrylate (note that poly is preferably about 2 to 20);

Among the above, propylene oxide-modified mono- or di (meth) acrylate is one of preferable ones as the (meth) acrylate monomer (c-3a), and in some cases, the recording signal characteristics and durability superior to the Blu-ray Disc of the present invention. Sex can be imparted.
The number of repeating propylene oxide units (modified number of moles) in the propylene oxide-modified (meth) acrylate is preferably about 2 to 15. When the number of (meth) acryloyl groups in the molecule is large, those having a large number of moles of modification with propylene oxide are preferred. For example, when there is one (meth) acryloyl group in the molecule, the number of repeating propylene oxide units (modified mole number) is preferably 2 or more, and preferably about 2 to 10. When the number of (meth) acryloyl groups is 2, the number of repeating propylene oxide units is preferably 7 or more, specifically about 7 to 15.
Examples of preferable propylene oxide-modified (meth) acrylate include polypropylene glycol mono- or di (meth) acrylate, polypropylene oxide-modified nonylphenyl (meth) acrylate, methoxytripropylene glycol (meth) acrylate, and the like.

Examples of the polypropylene glycol (meth) acrylate include Bremer ^RTM AP-150 (repeat number of propylene glycol units 3), AP-400 (repeat number of propylene glycol units 6), AP-550 (manufactured by NOF Corporation). And a number of repeating propylene glycol units 9). Examples of the polypropylene glycol di (meth) acrylate include FANCYL ^RTM FA-P240A (repetition number of propylene glycol units 7), FA-P270A (repetition number of propylene glycol units 12), polypropylene, manufactured by Hitachi Chemical Co., Ltd. Examples of the oxide-modified nonylphenyl (meth) acrylate include M-117 (Propylene oxide unit repeat number 2.5) manufactured by Toa Gosei Co., Ltd., New Frontier ^RTM NP-5P (Daiichi Kogyo Seiyaku Co., Ltd.) Examples of the propylene oxide unit repeating number 5) and methoxytripropylene glycol (meth) acrylate include NK ester AM-30PG (propylene glycol unit repeating number 3) manufactured by Shin-Nakamura Chemical Co., Ltd. Can be mentioned. Polypropylene glycol di (meth) acrylate having about 12 repeating propylene glycol units, such as FA-P270A, may be more preferable in some cases.
Further, among the (meth) acrylate monomers (c-3a) described in the group (I), C5-C18 alkyl (meth) acrylate and C7-18 alkylene glycol di (meth) acrylate are also preferable (meta) ) One of the acrylate monomers. These may give excellent recording signal characteristics and durability. Among these, C10-C15 alkyl (meth) acrylate is more preferable, and lauryl (meth) acrylate is particularly preferable.

In addition, the elastic modulus of the cured product of the resin composition of the present invention is preferable in the present invention by using the (meth) acrylate monomer (c-3a) of the above (I) group together with the component (A). Elastic modulus (25 ° C.), for example, 0.01 to 40 MPa or less, preferably 0.01 to less than 10 MPa, more preferably 0.01 to 9.5 MPa.
When adjusting the elastic modulus at 25 ° C. of the cured product layer of the resin composition of the present invention to preferably 0.01 to 40 MPa or less, the cured product layer is an interface layer laminated on the organic dye recording layer. The above optical disk has more excellent recording characteristics.
These (meth) acrylate monomers (c-3a) of group (I) can be used in a range of about 0 to 60%, preferably 10 to 60%, more based on the total amount of the resin composition. Preferably it is 20 to 60%, More preferably, it is 30 to 60% of range.

Moreover, in the said (C-3) component, the (meth) acrylate monomer (c-3b) of the following (II) group can be used as needed.
(II) group:
Dicyclopentenyloxyethyl (meth) acrylate (or dicyclopentadieneoxyethyl (meth) acrylate), 1,6-hexanediol di (meth) acrylate, dipropylene glycol di (meth) acrylate, or tripropylene glycol di (meta) ) Acrylate.
The (meth) acrylate monomer (c-3b) of the group (II) is further combined with the component (A) and, if necessary, either the component (C-2) or the component (c-3b). Or by using together with both, the change of the elasticity modulus of the hardened | cured material by a temperature change is less, and the hardened | cured material which has moderate hardness can be obtained.
These (meth) acrylate monomers (c-3b) of group (II) can be used in a range of about 0 to 60% with respect to the total amount of the resin composition. Preferably it is about 10 to 50%.
More preferable examples of the component (C) include C5 to C18 alkyl (meth) acrylate, polyethylene oxide 5 to 15 mol modified bisphenol A type di (meth) acrylate and dicyclopentadieneoxyethyl (meth) acrylate. it can. The resin composition of the present invention that contains at least one selected from the group consisting of these and has a content of 50 to 100% of the component (C) is more preferable.

In the resin composition of this invention, these (C) components can be used 1 type or 2 types or more mixed in arbitrary ratios. The content of the component (C) in the ultraviolet curable resin composition is usually 90% or less, preferably 80% or less, more preferably 70% or less, and further preferably 55% or less. The component (C) may be 0%, but it is usually preferable to include it. When it is included, it may be larger than 0%, preferably 4% or more, and preferably 30 to 80% by weight, or 40 to 70% by weight.
Moreover, when using together (C-1) and (C-2) as (C) component, normally (C-1) and / or (C-2) are respectively with respect to 100 weight part of (C) component. 5 to 50 parts by weight, preferably about 10 to 30 parts by weight, and (C-3) is used in an amount of 20 to 80 parts by weight, preferably about 25 to 75 parts by weight with respect to 100 parts by weight of component (C).
As one of the preferable resin compositions of the present invention, as the component (A) and the (meth) acrylate (C), urethane (meth) acrylate (C-2), (meth) acrylate of the group (I) Containing at least one selected from the group consisting of the monomer (c-3a) and the (meth) acrylate monomer (c-3b) of the group (II), (A) component, (C-2) component, (c- 3a) The total amount of component and (c-3b) is 70 to 99%, more preferably 80 to 99%, still more preferably 90 to 99%, based on the total amount of the resin composition. Examples thereof include an ultraviolet curable resin composition for optical discs in which the polymerization initiator (B) is 1 to 10% and the component (C) or additive other than the above is 0 to 20%.

In the resin composition of the present invention, the content ratio of the component (A), the component (B) and the component (C) is usually based on the total amount of the resin composition of the present invention.
The component (A) is 10 to 95% by weight (hereinafter, “%” represents “% by weight unless otherwise specified”), the component (B) is 1 to 20%, and the component (C) is 4% to 89%.
Preferably,
The component (A) is 20 to 95%, the component (B) is 1 to 20%, and the component (C) is 4% to 79%.
More preferably,
The component (A) is 30 to 95%, the component (B) is 1 to 10%, and the component (C) is 4 to 69%.
More preferably,
The component (A) is 40 to 95%, the component (B) is 1 to 10%, and the component (C) is 4 to 59%.
Most preferably,
The component (A) is 45 to 95%, the component (B) is 1 to 10%, and the component (C) is 4 to 54%.

Some preferred embodiments of the resin composition of the present invention are exemplified below.
(i) A mode including (A) component, (B) component and (C) component.
(ii) The content ratio of the three components (A), (B) and (C) is any of the above three components (A), (B) and (C) The embodiment according to (i) above, wherein the ratio is one.
(iii) The component (A) is caprolactone-modified hydroxyethyl (meth) acrylate, caprolactone-modified hydroxybutyl (meth) acrylate, caprolactone-modified hydroxypivalic acid neopentyl glycol di (meth) acrylate, caprolactone-modified tris (acryloxyethyl) isocyanate The embodiment according to (i) or (ii) above, which is at least one selected from the group consisting of nurate and caprolactone-modified dipentaerythritol hexa (meth) acrylate.
(iv) As the component (C), at least one selected from the group consisting of epoxy (meth) acrylate (C-1), urethane (meth) acrylate (C-2) and (meth) acrylate monomer (C-3). The embodiment according to any one of (i) to (iii) above.

(v) The embodiment described in (iv) above, which contains urethane (meth) acrylate (C-2) as the component (C).
(vi) The urethane (meth) acrylate (C-2) content is any one of the above (i) to (iv), which is larger than 0% and not larger than 15% with respect to the total amount of the resin composition of the present invention. The embodiment described in 1.
(vii) The urethane (meth) acrylate (C-2) is a urethane acrylate obtained by reacting a polyester polyol or a polyether polyol with polyisocyanate and 2-hydroxyethyl acrylate, as described in (v) or (vi) above Aspects.
(viii) The urethane (meth) acrylate (C-2) is a urethane acrylate obtained by using a poly C2-C6 alkylene glycol, a polyisocyanate and a hydroxy (meth) acrylate compound. Description aspect.
(ix) The embodiment described in (vii) or (viii) above, wherein the polyisocyanate is isophorone diisocyanate.

(x) The embodiment described in (viii) or (ix) above, wherein the hydroxy (meth) acrylate compound is a hydroxy C2-C4 alkyl (meth) acrylate.
(Xi) The aspect as described in any one of (i) to (x) above, which contains a (meth) acrylate monomer (C-3) as the component (C).
(Xii) As the (meth) acrylate monomer (C-3), from the (meth) acrylate monomer (c-3a) of the (I) group and the (meth) acrylate monomer (c-3b) of the (II) group The aspect as described in (xi) above, comprising at least one selected from the group consisting of:
(Xiii) The embodiment described in (xii) above, containing at least one kind from the (meth) acrylate monomer (c-3a).
(Xiv) The aspect as described in (xii) or (xiii) above, which contains a C5-C18 alkyl (meth) acrylate as the (c-3a).
(Xv) The aspect as described in (xiv) above, which contains a C10 to C15 alkyl (meth) acrylate as the (c-3a).
(Xvi) The aspect according to any one of (xii) to (xv) above, which contains propylene oxide-modified mono- or di (meth) acrylate as the (c-3a).
(Xvii) The aspect according to the above (xii) to (xvi), which contains 5 to 15 moles of modified bisphenol A type di (meth) acrylate as (c-3a).

(Xviii) The mode according to any one of the above (xii) to (xvii), which contains at least one kind from the (meth) acrylate monomer (c-3b) of the group (II).
(Xix) The aspect of the above (xviii) comprising dicyclopentadieneoxyethyl (meth) acrylate as the (c-3b).
(Xx) The above (xii) to (xii) to (x) wherein the content of at least one selected from the group consisting of (c-3a) and (c-3b) is 10 to 60% with respect to the total amount of the resin composition of the present invention. xix).
(Xxi) The aspect described in (xx) above, wherein the content of at least one selected from the group consisting of (c-3a) is 20 to 50%.
(Xxii) The embodiment described in (xx) above, wherein the content of at least one selected from the group consisting of (c-3a) is 30 to 50%.
(Xxiii) As said (meth) acrylate monomer (C-3), C5-C18 alkyl (meth) acrylate, polyethylene oxide 5-15 mol modified bisphenol A type di (meth) acrylate, dicyclopentadieneoxyethyl (meth) acrylate And at least one selected from the group consisting of polypropylene glycol di (meth) acrylate, the content of which is 50% to 100% with respect to the total amount of component (C), (xx), (xx ) To (xxii).

(Xxiv) The embodiment described in (xxiii) above, which contains a C5 to C18 alkyl (meth) acrylate as the component (C).
(Xxv) The embodiment according to (xxiv), wherein the C5 to C18 alkyl (meth) acrylate is lauryl (meth) acrylate.
(Xxvi) The embodiment according to any one of (i) to (xxv) above, wherein hindered amine is contained in an amount of 0.01 to 3% based on the total amount of the resin composition of the present invention.
(Xxvii) The embodiment according to any one of (i) to (xxvi), wherein the cured product of the resin composition of the present invention has an elastic modulus at 25 ° C. of 0.01 to 40 MPa.
(Xxviii) The mode described in the above (xxviii), wherein the cured product of the resin composition of the present invention has an elastic modulus at 25 ° C. of 0.01 to 9.5 MPa.

The ultraviolet curable resin composition for an optical disk of the present invention includes a rust inhibitor, an antioxidant, an organic solvent, a silane coupling agent, a polymerization inhibitor, a leveling agent, an antistatic agent, a surface lubricant, a fluorescent agent as necessary. Additives such as brighteners, light stabilizers (eg, hindered amine compounds), fillers and the like may be added. Specific examples of the hindered amine compound include, for example, 1,2,2,6,6-pentamethyl-4-piperidyl alcohol, 2,2,6,6-tetramethyl-4-piperidyl alcohol, 1,2,2,6,6. -Pentamethyl-4-piperidyl (meth) acrylate (manufactured by Adeka Co., Ltd., LA-82). The compounding quantity with respect to the total amount of the resin composition of this invention of these additives exists in the range of about 0 to 10%.
The hindered amine compound is one of preferred additives, and can be added in a range of 0.001 to 10%, preferably in a range of 0.01 to 3%, based on the total amount of the resin composition of the present invention.

  The ultraviolet curable resin composition for optical disks of the present invention can be obtained by mixing and dissolving the above-mentioned components at room temperature to 80 ° C., and if necessary, impurities may be removed by an operation such as filtration. In the adhesive resin composition of the present invention, it is preferable to appropriately adjust the blending ratio of the components so that the viscosity at 25 ° C. is in the range of 30 to 2000 mPa · s in view of applicability.

The ultraviolet curable resin composition for optical discs of the present invention can be suitably used as a coating agent for a light transmission layer on the laser incident side of a Blu-ray disc or the like. Specifically, the composition is applied to the optical disk substrate by an arbitrary method such as a spin coating method, a 2P method, a roll coating method, or a screen printing method so that the thickness of the applied resin becomes 1 to 100 μm. After coating, the film is cured by irradiating ultraviolet rays to near ultraviolet rays (wavelength of 200 to 400 nm) from one side or both sides. Irradiation dose is preferably from about 50~1500mJ / cm ^2, particularly preferably about 100~1000mJ / cm ^2. For curing by irradiation with ultraviolet to near ultraviolet rays, any light source may be used as long as it is a lamp that irradiates ultraviolet to near ultraviolet rays. For example, a low-pressure, high-pressure or ultrahigh-pressure mercury lamp, metal halide lamp, (pulse) xenon lamp, or electrodeless lamp can be used.

The ultraviolet curable resin composition of the present invention includes a first resin layer in which a light transmission layer is formed on a recording layer or an interface layer, and a surface opposite to the recording layer or interface layer side as viewed from the first resin layer. In the case where the second resin layer is formed on the top, it can be suitably used for the first resin layer.
In this case, the thickness of the first resin layer is usually 1 μm to 50 μm, preferably 5 μm to 40 μm, more preferably 10 μm to 30 μm.
The thickness of the second resin layer is usually 50 μm to 100 μm, preferably 60 μm to 95 μm, more preferably 70 μm to 90 μm.

In the case where the light transmission layer (protective layer) is composed of two layers, as a method for forming the light transmission layer (protective layer), specifically, the thickness of the resin applied as the first resin layer is 1 to 30 μm. The composition is applied to the optical disk substrate by an arbitrary method such as spin coating, 2P, roll coating, or screen printing. After coating, the film is cured by irradiating ultraviolet rays to near ultraviolet rays (wavelength of 200 to 400 nm) from one side or both sides. Irradiation dose is preferably 50~1500mJ / cm ^2, particularly preferably about 100~1000mJ / cm ^2. After curing, the composition is applied to the optical disk substrate by an arbitrary method such as a spin coating method, a 2P method, a roll coating method, or a screen printing method so that the film thickness becomes 70 to 100 μm as the second resin layer. . After coating, the film is cured by irradiating ultraviolet rays to near ultraviolet rays (wavelength of 200 to 400 nm) from one side or both sides. Irradiation dose is preferably from about 50~1500mJ / cm ^2, particularly preferably about 100~1000mJ / cm ^2. Further, for curing by irradiation with ultraviolet to near ultraviolet rays, any light source may be used as long as it is a lamp that irradiates ultraviolet to near ultraviolet rays. For example, a low-pressure, high-pressure or ultrahigh-pressure mercury lamp, metal halide lamp, (pulse) xenon lamp, or electrodeless lamp can be used.

The optical disk of the present invention obtained as described above comprises at least a plastic support substrate such as carbonate having a guide groove, a reflective layer formed on the guide groove, and an organic dye (usually an azo compound) formed on the reflective layer. An optical disc having a recording layer, an interface layer (dielectric layer) formed on the recording layer, and a cured layer (light transmission layer) of the resin composition of the present invention formed on the interface layer is there.
The optical disc of the present invention may further have a cured product layer of another resin composition on the cured product layer of the resin composition of the present invention. In this case, the light transmission layer is formed from two layers of a cured product layer of the resin composition of the present invention and a cured product layer of another resin composition.
In the optical disk of the present invention, it is necessary that the cured product layer of the resin composition of the present invention is directly formed on the interface layer formed on the recording layer containing an organic dye (usually an azo dye or the like). Thereby, the effect of the present invention is achieved.
As is well known to those skilled in the art, the interface layer is a layer formed of a metal atom-containing inorganic compound such as a composite containing a metal atom such as Zn.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

  The ultraviolet curable resin compositions of Examples 1 to 5 were prepared by uniformly mixing the components shown in Table 1 at the ratio (parts by weight) shown in Table 1.

In addition, each component shown with the abbreviation in Table 1 is as follows.
SR-495: caprolactone-modified (2 mole modified) hydroxyethyl acrylate, Hart-620 made by Sartomer Co., Ltd .: caprolactone modified (4 mole modified) hydroxypivalate neopentyl glycol diacrylate, Nippon Kayaku Co., Ltd. DPCA-120: caprolactone Modified (6 mol modified) dipentaerythritol hexaacrylate, Nippon Kayaku Co., Ltd. UA-1: 3 components of polytetramethylene glycol (molecular weight 850), isophorone diisocyanate, 2-hydroxyethyl acrylate 1: 2: Urethane acrylate BPE-10 obtained by reacting with 2: ethylene oxide 10 mol modified bisphenol A type diacrylate (Daiichi Kogyo Seiyaku Co., Ltd.)
FA-512A: dicyclopentadieneoxyethyl acrylate (manufactured by Hitachi Chemical Co., Ltd.)
FA-P270A: Polypropylene glycol diacrylate (manufactured by Hitachi Chemical Co., Ltd., trade name: FANCLILL ^RTM FA-P270A)
Irgacure 184: 1-hydroxycyclohexyl phenyl ketone (Ciba Specialty Chemicals)
LA-82: hindered amine (1,2,2,6,6-pentamethyl-4-piperidyl methacrylate: manufactured by Asahi Denka Co., Ltd.)
PMP: 4-mercaptophenol

  Using the obtained ultraviolet curable resin composition of the present invention, a Blu-ray disc having a dye recording layer was prepared and evaluated.

Production of Blu-ray Disc with Dye Recording Layer A reflective layer was formed by sputtering a silver alloy to a thickness of 100 nm on a polycarbonate substrate having a diameter of 12 cm and a thickness of 1.1 mm having guide grooves with a track pitch of 0.32 μm. Thereafter, a dye solution in which an azo dye was dissolved in a TFP (tetrafluoropropanol) solvent was applied by spin coating, and dried at 80 ° C. for 30 minutes to form a dye recording layer. Further, ZnS—SiO 2 (molar ratio 80:20) was sputtered to a thickness of about 15 nm to form an interface layer, and a Blu-ray Disc substrate was produced.
2. A Blu-ray disc substrate is placed on a spin table so that the interface layer is on top, and a circular cap treatment is performed so as to cover the inner diameter of 11.5 mm, and then the UV curable resin composition of the present invention is 2.0 g in the center cap. Fed on.
3. In accordance with the viscosity of the ultraviolet curable resin composition of the present invention, spin coating was performed at a speed range of 1000 rpm to 1500 rpm for 4 seconds to 7 seconds, and each coating film thickness was 25 μm. Immediately after the end of spin coating, the xenon flash lamp was irradiated with two shots, and cured so that the fluidity of the surface disappeared.
4). Using a high pressure mercury lamp, the ultraviolet curable resin composition of the present invention was completely cured by irradiation from the upper side at 400 mJ / cm ² for 3 seconds.
5. The cured UV-curable resin composition of the present invention is placed on a spin table, and a circular cap treatment is performed so as to cover the inner diameter of 11.5 mm, followed by BRD-864 (Nippon Kayaku Co., Ltd. The resin for the light transmission layer for disk) was supplied onto the cap at the center of 3.0 g.
6. Spin coating was performed for 4 to 7 seconds at a speed range of 1500 rpm, and the coating film thickness was 75 μm. Immediately after the end of spin coating, the xenon flash lamp was irradiated with two shots, and cured so that the fluidity of the surface disappeared.
7). Using a high-pressure mercury lamp, BRD-864 was completely cured by irradiating at 400 mJ / cm ² from the upper side for 3 seconds to produce a Blu-ray Disc of the present invention.

(I) Recording signal characteristics before and after durability test of Blu-ray Disc The optical disc of the present invention was left in an environment of 80 ° C. and 85% RH for 250 hours. Using a Blu-ray Disc data signal measuring device ODU-1000 manufactured by Pulse Tech Co., Ltd., recorded at a linear velocity of 4.92 m / s, playback power of 0.30 mW, T continuous recording (1T length = 0.08 μm), before and after durability test The recording signal characteristics (jitter value) of Blu-ray Discs were measured and evaluated according to the following criteria. The jitter value is one of the electrical signals of the optical disk. The higher these values are, the more the signal data of the Blu-ray disk is degraded. When the value is 10% or more, it becomes difficult to read and write data.
Jitter value evaluation ○ Jitter value less than 10.0%.
X: Jitter value of 10.0% or more.

(Ii) Measurement of elastic modulus of cured resin layer of the present invention The elastic modulus was measured according to a dynamic viscoelasticity measurement method based on JIS K 7244-5. That is, with the resin composition of the present invention, a coating film was formed so that the thickness after curing was 1 mm, and after curing at an accumulated light amount of 1 J / cm ² using a Fusion lamp D bulb, A sample piece having a length of 5 cm, a width of 1 cm, and a thickness of 1 mm was prepared and measured with a viscoelasticity measuring device DMS6100 manufactured by SII Nanotechnology. The measurement was performed in a bending mode, and measurement was performed in the range of −50 ° C. to 200 ° C. under conditions of an amplitude load of 10 mN, a frequency of 1 Hz, and a heating rate of 2 ° C./min.
(Iii) Light transmittance of 405 nm of the cured resin layer of the present invention:
A cured film of 100 μm was prepared, and the absorbance value at 405 nm of the film was measured using a spectrophotometer (U-3310, manufactured by Hitachi High-Technologies Corporation). As a result, all of the cured products of the resin compositions of Examples 1 to 5 had a light transmittance of 85% or more.

  From the results shown in Table 1, the resin compositions of Examples 1 to 5 containing (meth) acrylates having the structure represented by the formula (1) have good recording signal characteristics before and after the durability test. It was.

（式中、ｎは１〜１０の整数を示す）
及び、
（Ｂ）光重合開始剤、
を含有する紫外線硬化型樹脂組成物（以下単に樹脂組成物という）の硬化物層を有するブルーレイディスク。
（２） 式（１）で示される構造を有する（メタ）アクリレート（Ａ）が、カプロラクトン変性ヒドロキシエチル（メタ）アクリレート、カプロラクトン変性ヒドロキシブチル（メタ）アクリレート、カプロラクトン変性ヒドロキシピバリン酸ネオペンチルグリコールジ（メタ）アクリレート、カプロラクトン変性トリス（アクリロキシエチル）イソシアヌレート及びカプロラクトン変性ジペンタエリスリトールヘキサ（メタ）アクリレートからなる群から選ばれる少なくとも一種である上記（１）に記載のブルーレイディスク。
（３） 前記樹脂組成物が、更に、（Ａ）以外の（メタ）アクリレート（Ｃ）を含有する紫外線硬化型樹脂組成物である上記（１）又は（２）に記載のブルーレイディスク。
That is, the present invention relates to the following (1) to ( 36 ).
(1) Having an interface layer on the organic dye recording layer, directly on the interface layer ,
(A) (meth) acrylate having a structure represented by the following formula (1) (excluding urethane (meth) acrylate)

(In the formula, n represents an integer of 1 to 10)
as well as,
(B) a photopolymerization initiator,
Blu-ray disc having a cured product layer of an ultraviolet curable resin composition (hereinafter simply referred to as a resin composition).
(2) The (meth) acrylate (A) having the structure represented by the formula (1) is converted into caprolactone modified hydroxyethyl (meth) acrylate, caprolactone modified hydroxybutyl (meth) acrylate, caprolactone modified hydroxypivalate neopentyl glycol di ( The Blu-ray disc according to (1) above, which is at least one selected from the group consisting of (meth) acrylate, caprolactone-modified tris (acryloxyethyl) isocyanurate, and caprolactone-modified dipentaerythritol hexa (meth) acrylate.
(3) The Blu-ray disc according to (1) or (2), wherein the resin composition is an ultraviolet curable resin composition further containing (meth) acrylate (C) other than (A).

(4) Any one of said (1)-(3) which contains 20-95weight% of (meth) acrylate (A) which has a structure shown by Formula (1) with respect to the said whole resin composition. Blu-ray Disc as described in.
(5) The group which the said (meth) acrylate (C) consists of a polyester polyol or polyether polyol, the urethane acrylate which is a reaction material of polyisocyanate and 2-hydroxyethyl acrylate, and a polyethylene oxide modified bisphenol A type diacrylate. The Blu-ray disc according to (3) or (4) above, which is at least one selected from
(6) As said (meth) acrylate (C), from the group which consists of the (meth) acrylate monomer (c-3a) of the following (I) group, and the (meth) acrylate monomer (c-3b) of the following (II) group. The Blu-ray disc according to (3) or (4) above, which contains at least one selected
(I) Group (c-3a):
(I) C5-C18 alkyl (meth) acrylate or C7-18 alkylene glycol di (meth) acrylate;
(Ii) propylene oxide modified mono- or di (meth) acrylate;
(Iii) polyethylene oxide modified bisphenol A type di (meth) acrylate;
(Iv) polyethylene oxide-modified phenol acrylate; or (v) (meth) acrylate having a polytetramethylene glycol structure;
(II) Group (c-3b):
Dicyclopentenyloxyethyl (meth) acrylate (or dicyclopentadieneoxyethyl (meth) acrylate), 1,6-hexanediol di (meth) acrylate, dipropylene glycol di (meth) acrylate, or tripropylene glycol di (meta) ) Acrylate .

（式中、ｎは１〜１０の整数を示す。）
及び、
（Ｂ）光重合開始剤、
を含有する紫外線硬化型樹脂組成物を塗布し、次いで、該塗布膜に、活性エネルギー線を照射して、硬化物層を形成する工程を含むブルーレイディスクの製造方法。
（１４） 紫外線硬化型樹脂組成物が、更に、（Ａ）以外の（メタ）アクリレート（Ｃ）を含有する紫外線硬化型樹脂組成物である上記（１３）に記載のブルーレイディスクの製造方法。
(7) The Blu-ray disc according to (6) above, which contains (meth) acrylate monomer (c-3a) of (I) group as the (meth) acrylate (C).
(8) The Blu-ray disc according to (7) above, which contains a C5-C18 alkyl (meth) acrylate as the (meth) acrylate monomer (c-3a) of the group (I).
(9) The Blu-ray disc according to (6) above, which contains (meth) acrylate monomer (c-3b) of group (II) as (meth) acrylate (C).
(10) The Blu-ray disc according to any one of (3) to (9), which includes urethane (meth) acrylate (C-2) as the (meth) acrylate (C).
(11) The above (10), wherein the urethane (meth) acrylate (C-2) is a urethane (meth) acrylate obtained by reaction with poly C2 to C6 alkylene glycol, isophorone diisocyanate and hydroxy C2 to C4 (meth) acrylate. Blu-ray disc as described in).
(12) The Blu-ray disc according to any one of (1) to (11), wherein the resin composition further includes a hindered amine compound (D).
(13) At least directly on the interface layer of the Blu-ray disc substrate having the interface layer on the organic dye recording layer ,
(A) (meth) acrylate having a structure represented by the following formula (1),

(In the formula, n represents an integer of 1 to 10.)
as well as,
(B) a photopolymerization initiator,
A method for producing a Blu-ray disc, which comprises a step of applying a UV-curable resin composition containing, and then irradiating the coating film with active energy rays to form a cured product layer.
(14) The method for producing a Blu-ray disc according to the above (13), wherein the ultraviolet curable resin composition is an ultraviolet curable resin composition further containing (meth) acrylate (C) other than (A).

（式中、ｎは１〜１０の整数を示す。）
及び、
（Ｂ）光重合開始剤、
を含有し、かつ、有機色素記録層上に界面層を有するブルーレイディスクの界面層上に直接硬化物層を形成するための、ブルーレイディスク用紫外線硬化型樹脂組成物。
（１６） 式（１）で示される構造を有する（メタ）アクリレート（Ａ）が、カプロラクトン変性ヒドロキシエチル（メタ）アクリレート、カプロラクトン変性ヒドロキシブチル（メタ）アクリレート、カプロラクトン変性ヒドロキシピバリン酸ネオペンチルグリコールジ（メタ）アクリレート、カプロラクトン変性トリス（アクリロキシエチル）イソシアヌレート及びカプロラクトン変性ジペンタエリスリトールヘキサ（メタ）アクリレートからなる群から選ばれる少なくとも一種である上記（１５）に記載のブルーレイディスク用紫外線硬化型樹脂組成物。
（１７） 更に、上記（Ａ）以外の（メタ）アクリレート（Ｃ）を含有する上記（１５）又は（１６）に記載のブルーレイディスク用紫外線硬化型樹脂組成物。
（１８） 式（１）で示される構造を有する（メタ）アクリレート（Ａ）を、前記樹脂組成物全体に対して２０〜９５重量％含有する上記（１５）〜（１７）の何れか一項に記載のブルーレイディスク用紫外線硬化型樹脂組成物。
（１９） 前記（メタ）アクリレート（Ｃ）が、ポリエステルポリオール又はポリエーテルポリオールと、ポリイソシアネート及び２−ヒドロキシエチルアクリレートとの反応物であるウレタンアクリレート、及びポリエチレンオキサイド変性ビスフェノールＡ型ジアクリレートからなる群から選ばれる少なくとも一種である上記（１７）又は（１８）に記載のブルーレイディスク用紫外線硬化型樹脂組成物。
(15) (A) (meth) acrylate having a structure represented by the following formula (1) (however, excluding urethane (meth) acrylate)

(In the formula, n represents an integer of 1 to 10.)
as well as,
(B) a photopolymerization initiator,
And an ultraviolet curable resin composition for Blu-ray Disc, for directly forming a cured product layer on an interface layer of a Blu-ray Disc having an interface layer on an organic dye recording layer .
(16) The (meth) acrylate (A) having the structure represented by the formula (1) is converted into caprolactone-modified hydroxyethyl (meth) acrylate, caprolactone-modified hydroxybutyl (meth) acrylate, caprolactone-modified hydroxypivalate neopentyl glycol di ( The ultraviolet curable resin composition for Blu-ray Disc according to (15), which is at least one selected from the group consisting of (meth) acrylate, caprolactone-modified tris (acryloxyethyl) isocyanurate and caprolactone-modified dipentaerythritol hexa (meth) acrylate. object.
(17) The ultraviolet curable resin composition for Blu-ray discs according to (15) or (16), further comprising (meth) acrylate (C) other than (A).
(18) Any one of the above (15) to (17), wherein the (meth) acrylate (A) having a structure represented by the formula (1) is contained in an amount of 20 to 95% by weight based on the entire resin composition. 4. An ultraviolet curable resin composition for Blu-ray Discs.
(19) The group in which the (meth) acrylate (C) is a urethane acrylate that is a reaction product of a polyester polyol or a polyether polyol, a polyisocyanate, and 2-hydroxyethyl acrylate, and a polyethylene oxide-modified bisphenol A type diacrylate. The ultraviolet curable resin composition for Blu-ray Discs according to the above (17) or (18), which is at least one selected from:

(20) From the group consisting of (meth) acrylate monomer (c-3a) of the following (I) group and (meth) acrylate monomer (c-3b) of the following (II) group as the (meth) acrylate (C). The ultraviolet curable resin composition for Blu-ray Discs according to any one of (17) to (19), which contains at least one selected from the above;
(I) Group (c-3a):
(I) C5-C18 alkyl (meth) acrylate or C7-18 alkylene glycol di (meth) acrylate;
(Ii) propylene oxide modified mono- or di (meth) acrylate;
(Iii) polyethylene oxide modified bisphenol A type di (meth) acrylate;
(Iii) polyethylene oxide modified phenol acrylate;
(Iv) (meth) acrylates having a polytetramethylene glycol structure;
(II) Group (c-3b):
Dicyclopentenyloxyethyl (meth) acrylate (or dicyclopentadieneoxyethyl (meth) acrylate), 1,6-hexanediol di (meth) acrylate, dipropylene glycol di (meth) acrylate, or tripropylene glycol di (meta) ) Acrylate.
(21) The ultraviolet curable resin composition for Blu-ray Discs according to (20) above, which contains (meth) acrylate monomer (c-3a) of group (I) as (meth) acrylate (C).
(22) The ultraviolet curable resin composition for Blu-ray Discs according to (21), which contains a C5-C18 alkyl (meth) acrylate as the (meth) acrylate monomer (c-3a) of the group (I).
(23) The content of the (meth) acrylate monomer (c-3a) in the group (I) is 20 to 60% by weight with respect to the total amount of the resin composition, as described in (20) or (21) above UV curable resin composition for Blu-ray Disc.
(24) For the Blu-ray Disc according to any one of (20) to (23), comprising (meth) acrylate monomer (c-3b) of group (II) as (meth) acrylate (C). UV curable resin composition.

(25) The ultraviolet curable resin composition for Blu-ray Discs according to any one of (17) to (24), wherein urethane (meth) acrylate (C-2) is contained as the (meth) acrylate (C). .
(26) The above (25), wherein the urethane (meth) acrylate (C-2) is a urethane (meth) acrylate obtained by reaction with poly C2 to C6 alkylene glycol, isophorone diisocyanate and hydroxy C2 to C4 (meth) acrylate. ) UV curable resin composition for Blu-ray Discs.
(27) As component (C), C5-C18 alkyl (meth) acrylate, polyethylene oxide 5-15 mol modified bisphenol A type di (meth) acrylate, dicyclopentadieneoxyethyl (meth) acrylate and polypropylene glycol di (meth) It contains at least one selected from the group consisting of acrylates, and the content thereof is 50% to 100% with respect to the total amount of component (C). The ultraviolet curable resin composition for Blu-ray Discs described.
(28) As the component (A) and the (meth) acrylate (C), urethane (meth) acrylate (C-2), the (meth) acrylate monomer (c-3a) of the group (I) and the above ( II) containing at least one selected from the group consisting of (meth) acrylate monomers (c-3b) of group (A), (C-2), (c-3a) and (c-3b) The ultraviolet curable resin composition for Blu-ray Discs according to any one of (17) to (27), wherein the total amount of the components is 70 to 99% by weight based on the total amount of the resin composition.
(29) The above (28) containing at least one selected from the group consisting of the (meth) acrylate monomer (c-3a) of the (I) group and the (meth) acrylate monomer (c-3b) of the (II) group. ) UV curable resin composition for Blu-ray Discs.
(30) When urethane (meth) acrylate (C-2) is included, (i) component (A) is caprolactone-modified hydroxyethyl (meth) acrylate, or (ii) (I) of (I) group The ultraviolet curable resin composition for Blu-ray Discs according to the above (28), which comprises any one of (meth) acrylate monomers (c-3a).
(31) The ultraviolet curable resin composition for Blu-ray Discs according to any one of (15) to (30), further comprising a hindered amine compound (D).
(32) The ultraviolet curable resin composition for Blu-ray Discs according to any one of (17) to (31), wherein the cured product has an elastic modulus at 25 ° C. of 0.01 to 9.5 MPa when cured. object.
(33) At least one content selected from the group consisting of (meth) acrylate monomer (c-3a) in group (I) and (meth) acrylate monomer (c-3b) in group (II) is a resin composition. The ultraviolet curable resin composition for Blu-ray Discs according to (20) above, which is 10 to 60% by weight based on the total amount of the product.
(34) The ultraviolet ray for a Blu-ray disc according to (21), wherein the content of the (meth) acrylate monomer (c-3a) in the group (I) is 10 to 60% by weight based on the total amount of the resin composition. A curable resin composition.
(35) The ultraviolet ray for Blu-ray Disc according to (21), wherein the content of the (meth) acrylate monomer (c-3a) in the group (I) is 20 to 50% by weight based on the total amount of the resin composition A curable resin composition.
(36) The ultraviolet ray for a Blu-ray disc according to (21), wherein the content of the (meth) acrylate monomer (c-3a) of the group (I) is 30 to 50% by weight with respect to the total amount of the resin composition A curable resin composition.

Claims (32)

Having an interface layer on the organic dye recording layer, on the interface layer,
(A) (meth) acrylate having a structure represented by the following formula (1) (excluding urethane (meth) acrylate)

(In the formula, n represents an integer of 1 to 10.)
as well as,
(B) a photopolymerization initiator,
An optical disc having a cured product layer of an ultraviolet curable resin composition (hereinafter, simply referred to as a resin composition) containing benzene.   The (meth) acrylate (A) having the structure represented by the formula (1) is caprolactone-modified hydroxyethyl (meth) acrylate, caprolactone-modified hydroxybutyl (meth) acrylate, caprolactone-modified hydroxypivalic acid neopentyl glycol di (meth) acrylate The optical disk according to claim 1, wherein the optical disk is at least one selected from the group consisting of caprolactone-modified tris (acryloxyethyl) isocyanurate and caprolactone-modified dipentaerythritol hexa (meth) acrylate.   The optical disk according to claim 1, wherein the resin composition is an ultraviolet curable resin composition further containing (meth) acrylate (C) other than (A).   The optical disk according to claim 1, wherein the (meth) acrylate (A) having a structure represented by the formula (1) is contained in an amount of 20 to 95% by weight based on the entire resin composition.   The (meth) acrylate (C) is selected from the group consisting of a polyester polyol or polyether polyol, a urethane acrylate that is a reaction product of polyisocyanate and 2-hydroxyethyl acrylate, and a polyethylene oxide-modified bisphenol A type diacrylate. The optical disk according to claim 3, wherein the optical disk is at least one kind. The (meth) acrylate (C) is at least selected from the group consisting of (meth) acrylate monomer (c-3a) of the following (I) group and (meth) acrylate monomer (c-3b) of the following (II) group: The optical disc according to claim 3, containing one kind.
(I) Group (c-3a):
(I) C5-C18 alkyl (meth) acrylate or C7-18 alkylene glycol di (meth) acrylate;
(Ii) propylene oxide modified mono- or di (meth) acrylate;
(Iii) polyethylene oxide modified bisphenol A type di (meth) acrylate;
(Iv) polyethylene oxide modified phenol acrylate; or
(V) a (meth) acrylate having a polytetramethylene glycol structure;
(II) Group (c-3b):
Dicyclopentenyloxyethyl (meth) acrylate (or dicyclopentadieneoxyethyl (meth) acrylate), 1,6-hexanediol di (meth) acrylate, dipropylene glycol di (meth) acrylate, or tripropylene glycol di (meta) ) Acrylate.   The optical disk according to claim 6, comprising the (meth) acrylate monomer (c-3a) of the group (I) as the (meth) acrylate (C).   The optical disk according to claim 7, comprising a C5-C18 alkyl (meth) acrylate as the (meth) acrylate monomer (c-3a) of the group (I).   The optical disk according to claim 6, comprising the (meth) acrylate monomer (c-3b) of the group (II) as the (meth) acrylate (C).   The optical disk according to claim 3, comprising urethane (meth) acrylate (C-2) as the (meth) acrylate (C).   The urethane (meth) acrylate (C-2) is a urethane (meth) acrylate obtained by a reaction with poly C2 to C6 alkylene glycol, isophorone diisocyanate and hydroxy C2 to C4 (meth) acrylate. optical disk.   The optical disk according to claim 1, wherein the resin composition is a resin composition further comprising a hindered amine compound (D). At least on the interface layer of the optical disk substrate having an interface layer on the organic dye recording layer,
(A) (meth) acrylate having a structure represented by the following formula (1),

(In the formula, n represents an integer of 1 to 10.)
as well as,
(B) a photopolymerization initiator,
A method for producing an optical disk, comprising a step of applying a UV-curable resin composition containing, and then irradiating the coating film with active energy rays to form a cured product layer.   The method for producing an optical disk according to claim 13, wherein the ultraviolet curable resin composition is an ultraviolet curable resin composition further containing (meth) acrylate (C) other than (A). (A) (meth) acrylate having a structure represented by the following formula (1) (excluding urethane (meth) acrylate)

(In the formula, n represents an integer of 1 to 10.)
as well as,
(B) a photopolymerization initiator,
An ultraviolet curable resin composition for optical discs containing   The (meth) acrylate (A) having the structure represented by the formula (1) is caprolactone-modified hydroxyethyl (meth) acrylate, caprolactone-modified hydroxybutyl (meth) acrylate, caprolactone-modified hydroxypivalic acid neopentyl glycol di (meth) acrylate The ultraviolet curable resin composition for an optical disk according to claim 15, which is at least one selected from the group consisting of caprolactone-modified tris (acryloxyethyl) isocyanurate and caprolactone-modified dipentaerythritol hexa (meth) acrylate.   Furthermore, the ultraviolet curable resin composition for optical discs of Claim 15 containing (meth) acrylate (C) other than the said (A) component.   The ultraviolet curable resin composition for optical disks according to claim 15, comprising (meth) acrylate (A) having a structure represented by the formula (1) in an amount of 20 to 95% by weight based on the entire resin composition.   The (meth) acrylate (C) is selected from the group consisting of urethane acrylate which is a reaction product of polyester polyol or polyether polyol, polyisocyanate and 2-hydroxyethyl acrylate, and polyethylene oxide-modified bisphenol A diacrylate. The ultraviolet curable resin composition for optical discs according to claim 15, which is at least one kind. The (meth) acrylate (C) is at least selected from the group consisting of (meth) acrylate monomer (c-3a) of the following (I) group and (meth) acrylate monomer (c-3b) of the following (II) group: The ultraviolet curable resin composition for optical disks according to claim 15, which contains one kind.
(I) Group (c-3a):
(I) C5-C18 alkyl (meth) acrylate or C7-18 alkylene glycol di (meth) acrylate;
(Ii) propylene oxide modified mono- or di (meth) acrylate;
(Iii) polyethylene oxide modified bisphenol A type di (meth) acrylate;
(Iv) polyethylene oxide modified phenol acrylate;
(V) a (meth) acrylate having a polytetramethylene glycol structure;
(II) Group (c-3b):
Dicyclopentenyloxyethyl (meth) acrylate, 1,6-hexanediol di (meth) acrylate, dipropylene glycol di (meth) acrylate, or tripropylene glycol di (meth) acrylate.   21. The ultraviolet curable resin composition for an optical disk according to claim 20, comprising (meth) acrylate monomer (c-3a) of group (I) as (meth) acrylate (C).   The ultraviolet curable resin composition for optical disks according to claim 21, comprising a C5-C18 alkyl (meth) acrylate as the (meth) acrylate monomer (c-3a) of the group (I).   The ultraviolet curable resin composition for an optical disk according to claim 21, wherein the content of the (meth) acrylate monomer (c-3a) of the group (I) is 20 to 60% by weight based on the total amount of the resin composition. .   The ultraviolet curable resin composition for optical disks according to claim 20, comprising (meth) acrylate monomer (c-3b) of group (II) as (meth) acrylate (C).   The ultraviolet curable resin composition for optical discs of Claim 17 containing urethane (meth) acrylate (C-2) as said (meth) acrylate (C). The ultraviolet ray for optical disks according to claim 25, wherein the urethane acrylate (C-2) is a urethane (meth) acrylate obtained by a reaction with poly C2 to C6 alkylene glycol, isophorone diisocyanate and hydroxy C2 to C4 (meth) acrylate. A curable resin composition.   As component (C), C5 to C18 alkyl (meth) acrylate, polyethylene oxide 5 to 15 mol modified bisphenol A type di (meth) acrylate, dicyclopentadieneoxyethyl (meth) acrylate and polypropylene glycol di (meth) acrylate The ultraviolet curable resin composition for an optical disk according to claim 17, comprising at least one selected from the group, wherein the content is 50% to 100% with respect to the total amount of component (C).   As the component (A) and the (meth) acrylate (C), urethane (meth) acrylate (C-2), the (meth) acrylate monomer (c-3a) of the group (I) and the group (II) The total amount of (A) component, (C-2) component, (c-3a) component, and (c-3b) component, containing at least one selected from the group consisting of (meth) acrylate monomers (c-3b) The UV curable resin composition for an optical disk according to claim 17, wherein the content is 70 to 99% by weight based on the total amount of the resin composition.   The at least one selected from the group consisting of the (meth) acrylate monomer (c-3a) of the (I) group and the (meth) acrylate monomer (c-3b) of the (II) group. An ultraviolet curable resin composition for optical disks.   When urethane (meth) acrylate (C-2) is included, (i) component (A) is caprolactone-modified hydroxyethyl (meth) acrylate, or (ii) (meth) acrylate of group (I) above The ultraviolet curable resin composition for an optical disk according to claim 28, wherein the composition contains any of monomers (c-3a). Furthermore, the ultraviolet curable resin composition for optical discs of Claim 15 containing a hindered amine compound (D).   The ultraviolet curable resin composition for optical discs according to claim 17, wherein the cured product has an elastic modulus at 25 ° C of 0.01 to 9.5 MPa when cured.