JP2004195974A - Laminated film for optical parts, rolled film layer product, optical parts, and optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a laminated film for optical parts which has good optical characteristics and improved mold releasability, and to obtain a rolled film layer product, optical parts, and an optical disk. <P>SOLUTION: The laminated film, rolled film product, optical parts, and optical disk are characterized by having at least a light transmissive layer and a resin substrate layer, and the light transmissive layer, containing a silicone resin, is mainly composed of a thermoplastic resin, has a birefringence of ≤20 nm, and has a haze of <1%, and the resin substrate layer is laminated with the light transmissive layer and peeled and removed at the time of use. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a laminated film for an optical component, a film wound body, an optical component, and an optical disc that can be used as a member of an optical component such as a DVD, an organic EL, a flexible display, and electronic paper.

  2. Description of the Related Art Various polymer materials are used as components for home appliances, cameras, mobile phones, OA devices, electronic devices, and the like, and optical components such as CDs and DVDs.

  Representative polymer materials include, for example, acrylic resins, styrene resins, aromatic polyamide resins, liquid crystalline polymers, polyimide resins, polymer alloy materials, thermosetting resins, and the like.

  Acrylic resin or styrene-based resin has high transparency, and can easily produce polymers having various characteristics from rubbery materials to glassy polymers, and has properties such as easy modification. Although relatively inexpensive, there remains a major challenge in improving strength, heat resistance and toughness in film form. Lack of toughness is a problem common to all acrylic resins, and several methods for solving the lack of toughness have been reported. For example, it is known to add rubber particles to a resin (Patent Documents 1 and 2). Patent Document 2). However, in these methods, when a thin film is formed from a resin, a whitening phenomenon occurs when the resin is bent, and good bending workability cannot be obtained. For this reason, an acrylic resin having a glass transition point equal to or higher than room temperature and excellent in toughness and bending workability has not been found, and it has been difficult to form a thin film.

  As the aromatic polyamide resin, polyparaphenylene terephthalamide is mentioned as the most typical resin. Polyparaphenylene terephthalamide has excellent mechanical strength, low linear expansion coefficient, and the like, particularly because it has a high melting point, high crystallinity, flame retardancy, and a rigid molecular structure. However, aromatic polyamide resins such as polyparaphenylene terephthalamide are hardly soluble in organic solvents, and it is necessary to use an inorganic strong acid such as concentrated sulfuric acid as a solvent. Fiber spun from a concentrated solution such as concentrated sulfuric acid is known to exhibit high strength and elastic modulus, and has been industrially practiced, but has few applications to films. For example, a technique that can be formed into a film by stretching in a swollen state has been disclosed (see Patent Document 3). However, in this method, a manufacturing process is extremely complicated, productivity is reduced, and a product price is increased. Had the problem that As a method for improving the solubility in an organic solvent, a method of improving the solubility in an organic solvent by copolymerizing a unit having a halogen group introduced into an aromatic nucleus or a unit having high flexibility is known (Patent Reference 4). However, since the monomer is expensive, the product price increases, and there is a concern that heat resistance and flame retardancy may be impaired, and metal corrosion of halogen atoms is a problem.

  Polyimide resins are extremely useful industrially because they have extremely high heat resistance and toughness and have excellent film performance. In order to process the polyimide into a film, generally, a polyimide solution is applied and then heated to a high temperature to form an imide ring. When an imide ring is formed, excellent heat resistance and toughness can be obtained. However, once an imide ring is formed, the solubility in a solvent is remarkably reduced, which has been a very serious drawback when recycling polyimide. Therefore, development of a material having both properties of solubility in a solvent and heat resistance is required.For example, a unit in which a substituent such as an alkyl is introduced into an aromatic nucleus is copolymerized to improve the solubility in an organic solvent. Methods for improving are known. However, this method has problems that a material having a glass transition temperature of 320 ° C. or higher cannot be obtained, and that the monomer is expensive and the product price rises.

  Polymer alloy materials are intended to exhibit new performance by mixing different types of polymer materials, but polymers having different affinities have been mixed by using compatibilizers. Was. According to this method, the dispersion state forming the sea-island structure can be controlled because the technique aims at reducing the surface energy with a compatibilizing agent, but it cannot be completely compatibilized. There is no report of complete compatibilization of different polymers at present. In addition, since the compatibilizer is relatively expensive, the product price becomes high, and when the polymer alloy material is used for a long period of time, the compatibilizer bleeds out to the surface and causes contamination. And the dispersion state of the polymer alloy material changes.

  Since thermosetting resins are generally insoluble and infusible cured products, they have characteristics of being extremely excellent in durability such as solvent resistance or strength retention at high temperatures. However, since the cross-linking reaction is formed by a covalent bond, there is a drawback that it cannot be reprocessed, and this drawback has been fatal in securing recyclability in recent years. The closest to the recyclable thermosetting resin is an ionomer resin. An ionomer resin is a polymer having a carboxyl group in a side chain, and a metal oxide or metal hydroxide such as magnesium oxide or calcium hydroxide added thereto, and forms an ionic bond between the metal and the carboxyl group. Thus, a pseudo crosslinking point was formed. According to this method, although some improvement in heat resistance and toughness is observed, the bonding strength between the metal compound and the carboxyl group is weak, and the solubility of the metal compound in the resin is low and only a small amount can be added. No significant improvement in characteristics is observed.

Therefore, by mixing one or more kinds of synthetic polymers to form hydrogen bonds between the molecules, a pseudo-crosslinking structure is provided to introduce new characteristics that cannot be realized with conventional materials. A resin composition has been developed (see Patent Document 5). Further, an acrylic polymer (vinyl polymer A) containing a hydroxyl group which is a proton donating group as a polymer having a low glass transition temperature, and an amine group which is a proton accepting group as a polymer having a high glass transition temperature. Is formed by blending an acrylic polymer (vinyl polymer B) containing, and forming a hydrogen bond between the molecules to form a pseudo-crosslinked resin composition having a pseudo crosslinked structure. It has been reported that a film having excellent properties and a contradictory property of heat resistance and toughness can be obtained (see Patent Document 6).
JP-B-58-167605 JP-A-3-52910 JP-A-4-6738 JP-B-56-45421 JP 2000-273319 A JP 2002-38036 A

  However, the film formed from the pseudo-crosslinked resin composition has a problem in that if the film is wound alone, the films adhere to each other and it is difficult to re-extend the film.

  Therefore, in order to prevent sticking of the films, a method of attaching a protect film to the film or a method of sandwiching an interleaf paper or the like are being studied. However, in the method of bonding the protection film, the surface of the protection film is transferred, and in the method of sandwiching the interleaf paper or the like, bubbles and the like are involved when the bonding is performed. As a result, the bubble portion is transferred to the film. However, there is a problem that the surface smoothness of the film is deteriorated. Therefore, at present, the method of laminating the protected film to the film or the method of sandwiching the interleaf paper or the like has not been put to practical use, and it is difficult to form the film into a wound shape, and this problem has not been solved. .

  As another method, a method has been proposed in which the film is wound up together with the raw material without peeling the film from the raw material. According to this method, work such as laminating a protected film to the film becomes unnecessary, and it is possible to prevent a decrease in surface smoothness due to entrapment of air bubbles and the like and to wind up the film while maintaining surface smoothness. However, in order to reduce the warpage of the film, the amount of the blend of the vinyl polymer A and the vinyl polymer B in the pseudo-crosslinked resin composition is adjusted, and the pseudo-crosslinked resin is controlled by controlling the elastic modulus. Although the composition was improved, there was a new problem that the film was liable to stick to the raw material with the improvement, and it was difficult to peel off the film from the raw material.

  In recent years, optical disks such as CDs and DVDs have increased in capacity, and optical members such as DVD surface protection films have been increasing in recording density. When irregularities of about several μm occur on the film surface due to high recording density, errors occur during reading and it becomes difficult to read recorded information accurately, so a film with good surface smoothness is required. ing. A film applied as an optical component is produced, for example, by applying a film forming material on a raw PET (polyethylene terephthalate) film serving as a base material and then drying it. However, if the substrate is subjected to a release treatment or the like in order to easily peel the film from the substrate, the surface smoothness of the film is impaired. Therefore, it is necessary to apply a film material to a substrate having good surface smoothness and dry it without producing a release treatment or the like on the substrate to produce a film. However, when a substrate having good surface smoothness is applied, on the other hand, the film causes the substrate to stiffen and the releasability is deteriorated. As a result, there are problems such as poor workability and reduced yield. Was.

  Further, during actual use, the film serving as the light transmitting layer comes into direct contact with various objects, so that the surface may be damaged. In this case, since the light transmittance of the damaged portion is significantly reduced, it becomes difficult to read the signal, and there is a problem that the recording capacity is reduced.

  The present invention has been made to solve the above problems, and provides a laminated film for an optical component, a film wound body, an optical component, and an optical disc having good optical characteristics and improved releasability. The purpose is to:

  A further object of the present invention is to obtain, in addition to the above, a laminated film for an optical component, a film wound body, an optical component, and an optical disc having excellent surface scratch resistance in practical use.

  The present inventors have conducted various studies to achieve the above object, and as a result, in a thermoplastic resin solution forming a film, for example, by adding an optimal amount of a silicone resin that does not inhibit transparency as a mold release agent, The present invention has been accomplished by focusing on obtaining a film having good releasability from a raw material without impairing transparency.

  That is, the laminated film for an optical component of the present invention contains a silicone resin, is mainly composed of a thermoplastic resin, has a birefringence of 20 nm or less, and has a haze of less than 1%. And a resin substrate layer that is peeled and removed at the time of use.

  In the above invention, a hard coat layer having a pencil hardness of 3H or more is formed on the light transmission layer, and the resin base material layer is formed on the hard coat layer or on the light transmission layer opposite to the hard coat layer. They may be stacked.

  The thickness of the hard coat layer is preferably 0.5 to 8.0 μm, and the thickness accuracy is preferably within ± 1.0 μm. The hard coat layer is not particularly limited, but preferably has a crosslinked structure, more preferably a silicone crosslinked structure or an acrylic crosslinked structure. Further, the hard coat layer preferably contains 0.2 to 10.0% by weight of a silicone-based thermoplastic resin.

  In the above invention, in order to improve the reading accuracy of the recording layer, the birefringence of the light transmitting layer is more preferably 10 nm or less, still more preferably 5 nm or less, and particularly high density DVD having a birefringence of more than 20 GB. In this case, it is particularly preferable that the thickness be 2 nm or less.

Further, in the above invention, the thickness of the light transmitting layer is preferably 15 to 250 μm, more preferably 25 to 200 μm, and still more preferably 35 to 150 μm, and the thickness accuracy is within ± 2.0 μm. Preferably, there is. On the other hand, the thickness of the resin base material layer is preferably from 20 to 250 μm, more preferably from 25 to 200 μm, particularly preferably from 25 to 150 μm, and the thickness accuracy is within ± 1.0 μm. Preferably, there is. The measurement of the film thickness, a laser focus displacement meter (manufactured by Keyence Corporation, LT-8010) with, any size for (e.g. ^{1cm 2 ~10000cm} 2 in the plane), suitably from the entire (e.g., 25 to 1000 Point) A measurement point is selected and measured, and the average value can be used as the film thickness.

  In the above invention, the light transmittance of the light transmitting layer at 405 nm is preferably 87% or more, more preferably 90% or more.

  Further, in the above invention, the surface smoothness of the resin substrate layer on the light transmission layer side is preferably 20 nm or less, more preferably 15 nm or less, and further preferably 12 nm or less. According to the present invention, even when a base material (raw material) having a good surface smoothness of a coated surface is used at the time of film formation, the release property is improved by adding a silicone resin to the thermoplastic resin. As a result, it is possible to prevent the resin substrate layer and the light transmitting layer from being hardened. In addition, since a substrate (raw material) having a good surface smoothness of the coated surface is used, a film having a good surface smoothness can be obtained.

Further, in the above invention, it is desirable that the peeling residue due to the stiffness when the light transmitting layer is peeled off from the resin base material layer at 25 ° C. and a mold release speed of 100 mm / sec is 3 or less per 1 m ² . When the remaining peel by sticking exceeds 3 places per 1 m ^2, workability is deteriorated, because the cause of yield loss.

  In the above invention, the coefficient of static friction of the light transmitting layer with respect to PET at 25 ° C. is 0.42 or less, more preferably 0.40 or less. According to the present invention, since the silicone resin is added to the thermoplastic resin, a film having a low static friction coefficient can be obtained.

Furthermore, in the above invention, the thickness of the resin base material layer is preferably from 20 to 250 μm, more preferably from 25 to 200 μm, and still more preferably from 25 to 150 μm. Further, the film thickness accuracy is preferably within ± 1.0 μm. The measurement of the film thickness, a laser focus displacement meter (manufactured by Keyence Corporation, LT-8010) with, any size for (e.g. ^{1cm 2 ~10000cm} 2 in the plane), suitably from the entire (e.g., 25 to 1000 Point) A measurement point is selected and measured, and the average value can be used as the thickness.

  Further, in the above invention, the thermoplastic resin is preferably a vinyl-based polymer, and the vinyl-based polymer is a vinyl-based polymer A containing at least one proton-donating atomic group in a molecule, A vinyl-based polymer B containing at least one proton-accepting group in the molecule, wherein pseudo-crosslinks are formed between the proton-donating group and the proton-accepting group by intermolecular hydrogen bonding. Is more preferable. In the present invention, the light transmission layer is formed from a vinyl polymer in which two or more kinds of vinyl polymers having different properties are mixed and a pseudo crosslinked structure is formed between molecules. The crosslinked structure of the vinyl polymer of the present invention is cut by heat or a solvent at a temperature lower than the thermal decomposition temperature, and when the temperature is lowered or the solvent is removed, the crosslinked structure is used. This is because the structure is reformed. By forming a film using the vinyl polymer, it becomes possible to wait for a plurality of properties that cannot be obtained when a film is formed from one kind of vinyl polymer. For example, when two kinds of vinyl polymers are mixed, one vinyl polymer having good heat resistance and positive birefringence and the other vinyl polymer having flexibility and negative birefringence are used. Are used to mix the two vinyl polymers to form pseudocrosslinks. By forming pseudo-crosslinking, the film has both heat resistance and flexibility characteristics, and cancels out positive and negative birefringence and makes it zero birefringent to have low birefringence, giving the film contradictory characteristics.

  Further, since the present invention contains a silicone resin, it is possible not only to introduce contradictory properties by mixing two or more vinyl polymers, but also to improve strength and improve releasability.

  In the above invention, specific examples of the proton donating atomic group and the proton accepting atomic group are exemplified below.

  The proton donating group is a group including a functional group such as a carboxyl group, a sulfonic acid group, a phosphoric acid group, a hydroxyl group, a phenolic hydroxyl group, a mercapto group, a thiophenolic mercapto group, a primary amino group, and a secondary amino group. It is preferable that the proton accepting atomic group is a selected one, and the proton accepting atomic group is a functional group such as a carbonyl group, a sulfonyl group, a phosphoryl group, a cyano group, a secondary amino group, a tertiary amino group, and a nitrogen-containing heterocyclic group. Is preferably selected from the group containing

  More preferably, the proton donating group is preferably selected from the group containing a functional group such as a carboxyl group, a hydroxyl group, and a phenolic hydroxyl group. The proton accepting group is a secondary amino group. It is preferably selected from the group containing a functional group such as a tertiary amino group and a nitrogen-containing heterocyclic group.

  In the above invention, the vinyl polymer A containing at least one kind of proton-donating atomic group in the molecule may have one or more functional groups selected from a carboxyl group, a hydroxyl group or a phenolic hydroxyl group in the molecule. Is a polymer obtained by polymerizing a monomer mixture containing a vinyl monomer having the following formula, and the vinyl polymer B containing at least one proton-accepting atom group in the molecule is a nitrogen-containing polymer in the molecule. A polymer obtained by polymerizing a monomer mixture containing a vinyl monomer having an atom, and one of the vinyl polymer A and the vinyl polymer B has a glass transition temperature of 25 ° C. It is preferable that the other has a glass transition temperature of less than 25 ° C. According to the present invention, flexibility can be imparted to the vinyl polymer obtained by mixing the vinyl polymer A and the vinyl polymer B. Further, as will be described later, by adjusting the molecular weight of the obtained vinyl polymer, it is possible to prevent the film between the light transmitting layer and the resin base material layer from being hardened.

  In the above invention, the vinyl polymer is preferably a (meth) acrylic resin, and at least one of the vinyl polymer A and the vinyl polymer B is preferably an acrylic polymer. .

  In the above invention, the resin substrate layer is not particularly limited, but is preferably mainly composed of a polyester resin.

  Further, in the laminated film for optical parts of the present invention, it is preferable that the light transmitting layer of the laminated film for optical parts is used for the light transmitting layer of an optical disk. In this case, the surface on which the film, which is the light transmitting layer, is adhered, the surface in contact with the resin material layer is adhered to the optical disk side on which the recording layer is formed, so that the flatness with the recording layer is maintained, and the reading error is reduced. Is preferred in that the amount of

  Further, the present invention is a film wound layered body characterized in that the above-mentioned laminated film for optical parts is wound around, for example, an outer peripheral surface of a cylindrical core material and formed into a roll shape. According to the present invention, the light-transmitting layer, which is a film, can be wound without being peeled off from the raw material, which is a resin base material layer, so that surface smoothness is not impaired.

  Further, the optical component of the present invention is characterized in that the optical component is formed by attaching a light transmitting layer peeled from the resin base material layer of the laminated film for optical component, and the optical component is an optical disc. Is preferred.

  Further, a specific optical disc of the present invention is one in which a recording layer, an adhesive layer and a light transmitting layer are sequentially formed on a support base, and the light transmitting layer is a resin base of the laminated film for an optical component of the present invention. It is formed by peeling off the material layer and attaching it to the recording layer, which is mainly made of a thermoplastic resin containing a silicone resin, and has a birefringence of 20 nm or less and a haze of less than 1%. . Further, a hard coat layer having a pencil hardness of 3H or more may be further formed on the light transmitting layer.

  According to the laminated film for optical components and the film roll of the present invention, not only the transparency of the light transmitting layer is high, but also the releasability from the resin substrate layer is good, and the surface smoothness is good. Thus, it is possible to provide a high-quality optical component such as an optical disk having excellent mechanical strength and optical characteristics. Furthermore, a laminated film having a hard coat layer formed on the surface is excellent in scratch resistance in actual use, so that it is possible to provide optical components such as optical disks of higher quality, With the development of information and the like, it is possible to realize a large recording capacity required for an optical disk or the like.

  Hereinafter, a high-density DVD having a large capacity exceeding 20 GB will be described as an example of an optical disk to which a light transmission layer obtained by peeling a resin base layer from a laminated film for an optical component of the present invention is applied.

  FIG. 1 is a perspective view showing a partial structure of a high-density DVD, and FIG. 2 is a sectional view thereof. As shown in FIGS. 1 and 2, the high-density DVD 1 includes a recording layer 3 on a support base 2, and a light transmitting layer 5 is formed on the recording layer 3 via an adhesive layer 4.

  The DVD irradiates a short wavelength laser beam 6 of 405 nm from the light transmitting layer 5 side to reproduce and record signal information of the recording layer 3 through the light transmitting layer 5. The layer 5 is made thinner and the laminated film for optical parts of the present invention is applied.

  The constituent material of the DVD is not particularly limited except that a laminated film for an optical component is used for the light transmitting layer 5, and the support base 2 and the recording layer 3 may be made of the same material as in the related art. it can. For example, the support base 2 is formed of a plastic substrate such as polycarbonate, and the material of the adhesive layer 4 is not particularly limited as long as the transparency is not impaired. For example, an ultraviolet curable resin, a pressure-sensitive adhesive film, or the like may be used. Can be.

  The thickness of the support base 2 can be in the range of 0.4 mm to 1.2 mm, and the thickness of the recording layer 3 and the adhesive layer 4 can be in the range of 30 μm to 250 μm. 4 has a thickness of 30 μm to 150 μm.

  In addition, as a method of laminating each of the above-described support base 2, recording layer 3, adhesive layer 4, and light transmission layer 5, any method may be used.

  The laminated film for an optical component of the present invention is mainly composed of a thermoplastic resin containing a silicone resin, and has a birefringence of 20 nm or less and a haze of less than 1%, and a resin base laminated with the light transmission layer. And a material layer, and the resin substrate layer is peeled and removed at the time of use.

  The thermoplastic resin containing the silicone resin is not particularly limited as long as it has a birefringence of 20 nm or less and a haze of 1% or less, particularly in the form of a film. Examples of the silicone resin to be added to the thermoplastic resin include, for example, common silicones such as dimethyl silicone and methyl phenyl silicone; alkyl-modified silicones, fluorosilicone, polyether-modified silicone, fatty acid ester-modified silicone, and amino-modified silicone obtained by modifying these. Examples include silicone, carboxylic acid-modified silicone, carbino-modified silicone, epoxy-modified silicone, and mercapto-modified silicone.

  Among these, alkyl-modified silicone and polyether-modified silicone are preferred from the viewpoint of mold release and transparency.

As the alkyl-modified silicone and the polyether-modified silicone, for example, those having a structure represented by the following formula 1 can be used.

(Where R is an alkyl group or a group having a polyoxyalkylene structure, and n and m are integers indicating the degree of polymerization)

  Among those having the structure represented by the above formula 1, ethoxy-modified dimethyl silicone resin, methoxy-modified dimethyl silicone resin, n-propoxy-modified dimethyl silicone resin, iso-propoxy-modified dimethyl silicone resin, n-butoxy Group-modified dimethylsilicone resin, iso-butoxy group-modified dimethylsilicone resin, t-butoxy group-modified dimethylsilicone resin, wherein R is an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, and A modified dimethyl silicone resin which is a group having a polyoxyalkylene structure such as an ethylene chain or a polyoxypropylene chain can be used.

  In Formula 1, n and m are integers indicating the degree of polymerization, and the preferable degree of polymerization (n + m) of the silicone resin is 20 to 100,000. More preferably, it is 40 to 50,000, and still more preferably 100 to 10,000. If the degree of polymerization is less than 20, the abrasion resistance and smoothness of the film surface decrease, and if the degree of polymerization exceeds 100,000, the transparency tends to decrease.

  The degree of polymerization (m) of the segment having the structure of R as the modified portion is preferably from 5 to 100,000, more preferably from 10 to 50,000 from the viewpoint of smoothness and transparency of the film surface. And more preferably 20 to 1,000.

  Further, the silicone resin is preferably added in a range of 0.01% by weight to 0.5% by weight based on the thermoplastic resin, and more preferably in a range of 0.02% by weight to 0.3% by weight. . If the addition amount of the silicone resin is less than 0.01%, no effect of improving the releasability can be seen, and if the addition amount exceeds 0.5%, the transparency is impaired when the film is formed, and the surface of the silicone resin is damaged. Bleed out, which may cause a problem in surface smoothness.

  Further, the thermoplastic resin containing a silicone resin has a thickness accuracy within ± 2.0 μm, a light transmittance at 405 nm of 87% or more, and a birefringence when a film having a thickness of 15 to 250 μm is produced. Satisfies the condition of 20 nm or less. If the film thickness accuracy at this time exceeds ± 2.0 μm or the birefringence exceeds 20 nm, when used as a light transmitting layer, laser light passing through the light transmitting layer will not hit a correct position, and a reading error will occur. When the light transmittance at 405 nm is less than 87%, the laser light is weakened by absorption and scattering, and a reading error may occur. It is preferable to select

The laminated film for an optical component of the present invention is a film in which a light transmission layer mainly composed of the thermoplastic resin and a resin substrate layer are laminated at least, and the resin substrate layer is peeled off when used. As a criterion for peeling the film which is the light transmitting layer from the resin base material layer, when peeling at 25 ° C. and a mold release speed of 100 mm / sec, the peeling residue due to the hardness should be 3 places or less per 1 m ^2. preferable. This is because the yield of the obtained film decreases when the peeling residue per 1 m ² exceeds 3 places.

  In the present invention, by adding a silicone resin to the thermoplastic resin forming the light transmitting layer, the coefficient of static friction of the film is reduced, the releasability from the resin base material layer and the abrasion of the film as the light transmitting layer are reduced. An effect such as improvement of the property can be expected. Specifically, the coefficient of static friction with respect to PET is preferably 0.42 or less, more preferably 0.40 or less. If the coefficient of static friction exceeds 0.42, sticking occurs at the time of release from the resin base material layer, and when applied as a protective film for an optical component, there is a problem that the film is easily damaged.

  In the present invention, it is important to select a cast substrate when preparing a film to be a light transmitting layer. Specifically, it is preferable to apply on a resin base material layer having a thickness of 20 to 250 μm, a film thickness accuracy within ± 1.0 μm, and a surface smoothness of 20 nm or less. If the thickness of the resin base material layer is less than 20 μm, deflection occurs during coating, and surface accuracy may be reduced. If the thickness exceeds 250 μm, economy and roll take-up properties are deteriorated. . Further, in order to maintain the surface smoothness of the obtained film, it is preferable that the film pressure accuracy of the resin substrate layer is within ± 1.0 μm and the surface smoothness is 20 nm or less.

  Further, the thermoplastic resin in the present invention is preferably mainly composed of a vinyl polymer, and a vinyl polymer A containing at least one kind of proton-donating atomic group in a molecule and at least one kind or more in a molecule. It is more preferable that the pseudo-crosslinked resin composition prepared by mixing a vinyl polymer B containing a proton-accepting group with an organic solvent in an organic solvent, which comprises a proton-donating atom group and a proton-accepting atom group Are pseudo-crosslinked by intermolecular hydrogen bonds between the two.

  Examples of the vinyl-based monomer for producing the vinyl-based polymer A containing at least one proton-donating atomic group in the molecule include acrylic acid, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and the like. 2-hydroxybutyl acrylate, 2-acryloyloxyethyl succinic acid, 2-acryloyloxyethyl hexahydrophthalic acid, 2-acryloyloxyethyl-2-hydroxypropyl phthalate, 2-acryloyloxyethyl acid phosphate, 2- Hydroxy-3-acryloyloxypropyl acrylate, methacrylic acid, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2-hydroxybutyl methacrylate, 2-methacryloyloxyethyl succinic acid, 2-methacryloyl Siethyl hexahydrophthalic acid, 2-methacryloyloxyethyl-2-hydroxypropyl phthalate, 2-methacryloyloxyethyl acid phosphate, 2-hydroxy-3-methacryloyloxypropyl acrylate, vinyl benzoic acid, vinyl benzoate and the like Derivatives and the like. However, the compounds shown here are examples, and the present invention is not limited to these compounds. When this component is copolymerized with another vinyl monomer, the copolymerization ratio is preferably 2 mol%, more preferably 5 mol% or more, and the upper limit is particularly preferably from the viewpoint of solubility. Although there is no limitation, 40 mol% or less is preferable.

  Examples of the vinyl-based monomer for producing the vinyl-based polymer B containing at least one proton-accepting atomic group in the molecule include aminoethyl acrylate, aminoethyl methacrylate, methylaminoethyl acrylate, methylamino Amino (meth) acrylates such as ethyl methacrylate, (meth) acrylamides such as acrylamide, methacrylamide, N-methylacrylamide, N-ethylacrylamide, N-methylmethacrylamide and N-ethylmethacrylamide; , 6-Tetramethyl-4-piperidyl methacrylate, 2,2,6,6-tetramethyl-4-piperidyl acrylate, 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate, 1,2,2 , 6,6-pentamethyl-4-pi Lysyl acrylate, N- (2 ′, 2 ′, 6 ′, 6′-tetramethyl-4-piperidyl) -methacrylamide, N- (2 ′, 2 ′, 6 ′, 6′-tetramethyl-4-piperidyl) ) -Acrylamide, N- (1 ′, 2 ′, 2 ′, 6 ′, 6′-pentamethyl-4-piperidyl) -methacrylamide, N- (1 ′, 2 ′, 2 ′, 6 ′, 6′- Pentamethyl-4-piperidyl) -acrylamide and the like. However, the compounds shown here are examples, and the present invention is not limited to these compounds. When this component is copolymerized with another vinyl monomer, the copolymerization ratio is preferably 1 mol%, more preferably 2 mol% or more, from the viewpoint of solubility, as described above. . The upper limit is not particularly limited, but is preferably 30 mol% or less.

  Further, regarding the vinyl polymer, a vinyl polymer containing at least one kind of proton donating atom group in a molecule and a vinyl polymer containing at least one kind of proton accepting atom group in a molecule. When either one has a glass transition temperature of less than 25 ° C. and the other has a glass transition temperature of 25 ° C. or more, heat resistance and flexibility can be imparted to the obtained polymer. If the temperature deviates from this temperature condition, there is a problem that flexibility cannot be imparted at room temperature and thermal deformation occurs. Therefore, there is no particular problem as long as the glass transition temperature is within a range satisfying the above conditions. It is preferred that the temperature is less than + 50 ° C., more preferably less than 0 ° C., and the other is + 100 ° C. The glass transition temperature can be measured by DVA (dynamic viscoelasticity measurement), TMA, DSC method or the like, and is preferably based on DVA (dynamic viscoelasticity measurement). Measured by DVA.

In order to satisfy the above-mentioned temperature conditions, a vinyl-based polymer A containing at least one proton-donating atomic group in a molecule and a vinyl-based polymer B containing at least one or more proton-accepting atomic group in a molecule Can be copolymerized with other vinyl monomers. The monomer that can be used is not particularly limited as long as it does not impair the transparency of the obtained polymer, and specific examples include methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, I-butyl acrylate, t-butyl acrylate, pentyl acrylate, n-hexyl acrylate, 2-ethylhexyl acrylate, n-octyl acrylate, dodecyl acrylate, octadecyl acrylate, butoxyethyl acrylate, phenyl acrylate , Benzyl acrylate, naphthyl acrylate, glycidyl acrylate, 2-hydroxyethyl acrylate, cyclohexyl acrylate, methylcyclohexyl acrylate, trimethylcyclohexyl acrylate, norbornyl acrylate, norbornylmethyl acrylate, silicon acrylate Nonoruboruniru, isobornyl acrylate, bornyl acrylate, menthyl acrylate, fenchyl acrylate, adamantyl acrylate, dimethyl adamantyl, acrylic acid tricyclo [5.2.1.0 ^2,6] dec-8-yl, acrylic acid Acrylic esters such as tricyclo [5.2.1.0 ^2,6 ] dec-4-methyl, cyclodecyl acrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, i-butyl methacrylate, methacryl T-butyl acrylate, pentyl methacrylate, n-hexyl methacrylate, 2-ethylhexyl methacrylate, n-octyl methacrylate, dodecyl methacrylate, octadecyl methacrylate, butoxyethyl methacrylate, phenyl methacrylate, phenyl methacrylate, naphthyl methacrylate, Glycidyl acrylate, cyclopentyl methacrylate, cyclohexyl methacrylate, methylcyclohexyl methacrylate, trimethylcyclohexyl methacrylate, norbornyl methacrylate, norbornyl methacrylate, cyanonorbornyl methacrylate, phenylnorbornyl methacrylate, isobornyl methacrylate Bornyl methacrylate, Menthyl methacrylate, Fentyl methacrylate, Adamantyl methacrylate, Dimethyl adamantyl methacrylate, Tricyclo [5.2.1.0 ^2,6 ] dec-8-yl, Tricyclomethacrylate [5.2 .1.0 ^2,6] dec-4-methyl, methacrylic acid esters such as methacrylic acid cyclodecyl, alpha-methyl styrene, alpha-ethylstyrene, alpha-fluoro styrene, alpha-click Aromatic vinyl compounds such as styrene, α-bromostyrene, fluorostyrene, chlorostyrene, bromostyrene, methylstyrene and methoxystyrene, calcium acrylate, barium acrylate, lead acrylate, tin acrylate, zinc acrylate, methacrylic acid Metal salts of (meth) acrylates such as calcium, barium methacrylate, lead methacrylate, tin methacrylate, zinc methacrylate, unsaturated fatty acids such as acrylic acid and methacrylic acid, vinyl cyanide compounds such as acrylonitrile and methacrylonitrile, N-methylmaleimide, N-ethylmaleimide, N-propylmaleimide, Ni-propylmaleimide, N-butylmaleimide, Ni-butylmaleimide, Nt-butylmaleimide, N-laurylmaleimide, N-cyclohexyl Lumaleimide, N-benzylmaleimide, N-phenylmaleimide, N- (2-chlorophenyl) maleimide, N- (4-chlorophenyl) maleimide, N- (4-bromophenyl) phenylmaleimide, N- (2-methylphenyl) maleimide N- (2-ethylphenyl) maleimide, N- (2-methoxyphenyl) maleimide, N- (2,4,6-trimethylphenyl) maleimide, N- (4-benzylphenyl) maleimide, N- (2 4,6-tribromophenyl) maleimide and the like. These may be used alone or in combination of two or more.

  Further, regarding the molecular weight of the polymer, a vinyl-based polymer A containing at least one proton-donating atomic group in the molecule and a vinyl-based polymer B containing at least one or more proton-accepting atomic group in the molecule. Among them, the polymer having a glass transition temperature of less than 25 ° C. is not limited, but the weight average molecular weight (in terms of polystyrene) is in the range of 10,000 to 1,000,000 from the viewpoint of strength and moldability. For polymers having a glass transition temperature of 25 ° C. or higher, the weight average molecular weight (in terms of polystyrene) is preferably 50,000 or higher, and more preferably 70,000 to 1,000,000. When the polymerization average molecular weight is less than 50,000, there is a problem in strength reduction and releasability of the obtained film, and when the polymerization average molecular weight exceeds 1,000,000, the viscosity of the resin solution before film coating becomes too high. This is because handling becomes difficult.

  In the present invention, a method of mixing a vinyl polymer A containing at least one kind of proton donating atom group in a molecule and a vinyl polymer B containing at least one kind of proton accepting atom group in a molecule Is not particularly limited, such as a melt kneading method and a varnish blending method.

  As a polymerization method for producing the polymer, existing methods such as bulk polymerization, suspension polymerization, emulsion polymerization, and solution polymerization can be applied.

  When performing polymerization, a polymerization initiator can be used. Examples of the polymerization initiator include benzoyl peroxide, lauroyl peroxide, di-t-butylperoxyhexahydroterephthalate, t-butylperoxy-2-ethylhexanoate, 1,1-t-butylperoxy-3, Organic peroxides such as 3,5-trimethylcyclohexane, azo compounds such as azobisisobutyronitrile, azobis-4-methoxy-2,4-dimethylvaleronitrile, azobiscyclohexanone-1-carbonitrile, and azodibenzoyl Any of those that can be used for ordinary radical polymerization, such as water-soluble catalysts such as potassium persulfate and ammonium persulfate, and redox catalysts using a combination of a peroxide or a persulfate and a reducing agent can be used. The polymerization initiator is preferably used in a range of 0.01 to 10% by weight based on the total amount of the monomers.

  Further, as a molecular weight modifier, a mercaptan compound, thioglycol, carbon tetrachloride, α-methylstyrene dimer, or the like can be added as needed.

  In the case of thermal polymerization, the polymerization temperature can be appropriately selected from 0 to 200 ° C, and is preferably in the range of 50 to 120 ° C.

  The thermoplastic resin in the present invention, when used, from the viewpoint of deterioration prevention, thermal stability, moldability and processability, etc., phenol-based, phosphite-based, thioether-based antioxidants, aliphatic alcohols, fatty acids Adds release agents such as esters, phthalates, triglycerides, fluorine-based surfactants, metal salts of higher fatty acids, other lubricants, plasticizers, antistatic agents, ultraviolet absorbers, flame retardants, heavy metal deactivators, etc. You may use it.

  In the present invention, the material of the resin substrate layer is not particularly limited, PET film, PEN film, polysulfone film, polyethersulfone film, polyetherketone film, polyether film, polyamideimide film, polyimide film, polycarbonate film, An acrylic resin film, an epoxy resin film, a norbornene-based polymer film and the like can be mentioned. Among them, a film mainly composed of a PET film is preferable in terms of heat resistance, surface flatness, and economy.

  Further, in the laminated film for an optical component of the present invention, a hard coat layer having a pencil hardness of 3H or more is further formed on the light transmissive layer, and the light transmissive layer on the hard coat layer or on the side opposite to the hard coat layer is further formed. The resin base material layer may be laminated thereon. In actual use, bonding the surface where the light transmitting layer is in contact with the resin base material layer to the optical disk side on which the recording layer is formed maintains flatness with the recording layer and reduces reading errors. Therefore, it is preferable that the resin base material layer of the three-layer laminated film is formed on the light transmitting layer on the side opposite to the hard coat layer.

  If the pencil hardness of the hard coat layer is less than 3H, the scratch resistance is insufficient. The hard coat layer is not particularly limited, but preferably has a crosslinked structure, more preferably a silicone crosslinked structure or an acrylic crosslinked structure. Further, the thickness of the hard coat layer is preferably 0.5 to 8.0 μm, and the thickness accuracy is preferably within ± 1.0 μm. If the thickness of the hard coat layer is less than 0.5 μm, the effect of improving the scratch resistance is low, and if it exceeds 8.0 μm, cracks occur during an environmental test.

  The method for forming such a hard coat layer on the light transmission layer is not particularly limited, but, for example, a hard coat precursor to which a curing catalyst is added is applied to a previously prepared light transmission layer film to a uniform thickness. After that, it can be cured by heating or irradiating with ultraviolet rays to form.

  Examples of the hard coat precursor that forms the silicone-based crosslinked structure include tetraethoxysilane, tetramethoxysilane, C1 to C12 alkyltrimethoxysilane, C1 to C12 alkyltriethoxysilane, and di (C1 to C12 alkyl) trialkylsilane. Hydrolysis condensates such as methoxysilane, di (C1 to C12 alkyl) triethoxysilane, tri (C1 to C12 alkyl) methoxysilane, and tri (C1 to C12 alkyl) ethoxysilane can be used. These silane compounds may be used alone or in combination of two or more.

  Examples of the curing catalyst added to the hard coat precursor include, for example, alkali metal hydroxides such as potassium hydroxide, sodium hydroxide, barium hydroxide, strontium hydroxide, lithium hydroxide, magnesium hydroxide, and calcium hydroxide. , Trimethylamine, triethylamine, tri (C3-C8 alkyl) amine, dimethylamine, diethylamine, di (C3-C8 alkyl) amine, methylamine, ethylamine, (C3-C8 alkyl) amine, cyclohexamine, morpholine, trimethylammonium hydro Amine compounds such as oxide, triethylammonium hydroxide, tetramethylammonium hydroxide, hydroxyethyldimethylhydroxide, hydroxyethyldiethylhydroxide You can to have, among others potassium hydroxide, sodium hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, hydroxyethyl trimethylammonium hydroxide, hydroxyethyl triethylammonium hydroxide and the like. Among them, potassium hydroxide, sodium hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, hydroxyethyltrimethylammonium hydroxide, hydroxyethyltriethylammonium hydroxide and the like are more preferable. However, these are merely examples, and the present invention is not limited to those shown here. These may be used alone or in combination of two or more. The amount of the curing catalyst to be added is not particularly limited, but can be appropriately selected in the range of 0.05% by weight to 10% by weight based on the solid content of the hard coat precursor.

  The curing temperature by heating is not particularly limited as long as it is a temperature at which the hard coat precursor can be cured, but generally, about 60 ° C. to 180 ° C. is suitable. The most preferred temperature is about 120C to 160C.

  A catalyst is used when producing the hard coat precursor. Examples of the catalyst include alkali hydroxides and amine compounds similar to the above-described curing catalysts, and further include hydrochloric acid, sulfuric acid, nitric acid, Acids such as toluenesulfonic acid, phosphoric acid, phenolsulfonic acid and polyphosphoric acid can be used. These can be used alone or in combination of two or more. Note that what is shown here is merely an example, and the present invention is not limited to these.

  The reaction temperature for producing the hard coat precursor in the present invention is not particularly limited, but a temperature of about 20C to 100C is preferable. When the temperature is lower than 20 ° C., the reaction rate decreases and productivity decreases. If the temperature exceeds 100 ° C., there is a danger because alcohol or water produced by hydrolysis or condensation boils. The reaction is preferably performed in a solution. Examples of the solvent that can be used include alcohols such as methanol, ethanol, propanol, butanol, pentanol, hexanol, heptanol, and octanol. What is shown here is one example, and the present invention is not limited to these.

  The acrylic crosslinked structure serving as the hard coat layer in the present invention can be formed using a polymerizable material (hard coat material) containing a polymerizable compound having an acryloyl group or a methacryloyl group.

  Examples of the polymerizable compound that can be used in the hard coat material include two or more (meth) acryloyl groups such as a urethane (meth) acrylate oligomer, an epoxy (meth) acrylate oligomer, and an oligoester (meth) acrylate. Oligomer: ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate Such as alkylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, and dipropylene glycol di (meth) acrylate. Dialkylene di (meth) acrylate, glycerin di (meth) acrylate, di (meth) acrylate of an adduct of alkylene oxide (ethylene oxide or propylene oxide) added to bisphenol A [for example, 2,2-bis [4- Bifunctional (meth) acrylates such as (2- (meth) acryloyloxyethoxy) phenyl] propane, 2,2-bis [4- (2- (meth) acryloyloxypropoxy) phenyl] propane, etc .; trimethylolpropane Tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, having a phosphazo group -P = N- and a (meth) acryloyl group ( Data) include multifunctional (meth) acrylates such as acrylates.

Further, in order to adjust the properties of the cured coating film, a monofunctional (meth) acrylate such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl ( _C1-20 alkyl (meth) acrylates such as meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, cyclohexyl (meth) acrylate, phenyl (meth) acrylate, benzyl (meth) acrylate, isobornyl (meth) acrylate , 2-hydroxyethyl (meth) acrylate, hydroxyl group-containing (meth) acrylates such as 2-hydroxypropyl (meth) acrylate, glycidyl (meth) acrylate, N, N-diethylaminoethyl (meth) acrylate A halogen-containing (meth) acrylate such as a basic nitrogen atom-containing (meth) acrylate such as a lylate, trifluoroethyl (meth) acrylate, or tetrafluoropropyl (meth) acrylate may be used in combination.

  Such a polymerizable hard coat material may be a thermosetting material containing a thermal polymerization initiator (organic peroxide such as benzoylperoxide, cumene hydroperoxide, dicumyl peroxide, etc.). In order to improve the viscosity, a photocurable type containing a photopolymerization initiator is preferable, and an ultraviolet curable type is particularly preferable.

  Examples of the compound used to initiate photopolymerization include benzoin or its derivatives (benzoin, benzoin isopropyl ether, benzoin isobutyl ether, etc.), ketones (1-hydroxycyclohexyl phenyl ketone, acetophenone and its derivatives (alkoxyacetophenone, etc.) ), Propiophenone or its derivatives (such as 2-hydroxy-2-methylpropiophenone), benzophenone or its derivatives (such as 4,4'-dimethoxybenzophenone, 4,4'-bis (4-diethylaminophenyl) ketone) , Benzyl or a derivative thereof (such as benzyl and benzyl methyl ketal), thioxanthone or a derivative thereof (2,4-diethylthioxanthone, 2-ethylthioxanthone, 2-isopropylthioxanthone Chlorothioxanthone, etc.) can be used conventional photopolymerization initiator or a sensitizer such as these may be used alone or may be used in combination of two or more.

  The amount of the thermal polymerization initiator or the photopolymerization initiator is preferably about 0.1 to 10 parts by weight based on 100 parts by weight of the polymerizable compound.

  The hard coat material may be an organic solvent-containing coating material containing an organic solvent such as hydrocarbons, alcohols, esters, ketones, and ethers, if necessary.

  Further, the hard coat layer in the present invention preferably contains a silicone-based thermoplastic resin in an amount of 0.2 to 10.0% by weight. By containing the silicone-based thermoplastic resin, the slip property of the surface of the hard coat layer is improved, and the scratch resistance can be further improved.

  When the hard coat layer is formed on the light transmission layer to form the optical component film of the present invention, the birefringence of the two layers including the light transmission layer and the hard coat layer is a preferable value of the light transmission layer alone. Is preferably 20 nm or less, more preferably 10 nm or less, still more preferably 5 nm or less, and especially 2 nm or less in the case of a high-density DVD exceeding 20 GB. preferable.

  In the laminated film for optical parts of the present invention, an adhesive layer may be further formed on the light transmitting layer, and in this case, the base material layer is laminated on the light transmitting layer or the adhesive layer. . When a hard coat layer is formed on the light transmitting layer, the adhesive layer is formed on the light transmitting layer on the side opposite to the hard coat layer, and the base material layer is formed on the hard coat layer or the adhesive layer. Will be laminated. Further, when the adhesive layer is located on the outermost layer, it may be protected, and a protective layer which is peeled off when used may be further formed. As described above, the laminated film of the present invention can be a laminated film having a two- to five-layer structure in which the adhesive layer, the hard coat layer, and the protective layer are laminated in addition to the light transmitting layer and the base layer. The “adhesive layer” refers to a layer formed by applying an adhesive or a pressure-sensitive adhesive, or laminating those films, and is capable of bonding a laminated film and a recording layer. If so, known materials can be used, and the type and forming method are not particularly limited.

  The method for producing the laminated film for an optical component of the present invention is not particularly limited, and examples thereof include a multi-layer extrusion method and a method such as a melt casting method, among which a method of obtaining a film by volatilizing an organic solvent by a melt casting method. Is preferred in that a film having good surface smoothness can be obtained. The conditions for the casting are not particularly limited. For example, the casting can be performed in air or an inert gas at a temperature of 50 ° C to 160 ° C.

  Moreover, the laminated film for optical parts of the present invention can be wound into a roll shape to form a wound layer body.

  Next, the following Examples 1 to 6 and Comparative Examples 1 and 2 were used to evaluate characteristics of the laminated film for optical parts of the present invention.

[Example 1]
(Polymer A)
1252 g of acetone was charged as a polymerization solvent into a 4 liter stainless steel autoclave having a pressure resistance of 2.3 kg / cm ² G, 1035 g of butyl acrylate (BA, manufactured by Wako Pure Chemical Industries, Ltd.), and acrylic acid (AA, Wako Pure Chemical) 46 g (manufactured by K.K.). Thereafter, nitrogen gas was passed at room temperature for about 1 hour to replace dissolved oxygen, and then the autoclave was pressurized and sealed, and the temperature was raised to 60 ° C. Further, as a polymerization initiator, 3.1 g of lauroyl peroxide (LPO, manufactured by NOF Corporation), 1.1 g of t-butylperoxy 2-ethylhexanate (PBO, manufactured by NOF Corporation), α-methyl 0.03 g of styrene dimer (AMSD, manufactured by Goi Chemical Co., Ltd.) was dissolved in 40 g of acetone, and nitrogen gas was passed through at room temperature for about 10 minutes, and a mixed solution in which dissolved oxygen had been replaced was added. Thereafter, the same temperature was maintained for about 14 hours. Further, after the temperature was raised to 90 ° C. and maintained at the same temperature for about 6 hours, a polymer solution was obtained. At this time, the conversion was 98% or more, and the weight average molecular weight was 250,000.

(Polymer B)
1500 g of acetone as a polymerization solvent was charged into a 4 liter stainless steel autoclave having a pressure resistance of 2.3 kg / cm ² G, 749 g of methyl methacrylate (MMA, manufactured by Wako Pure Chemical Industries, Ltd.), and tricyclomethacrylate [5.2. 1.0 ^2,6 ] dec-8-yl (TCDMA, manufactured by Hitachi Chemical Co., Ltd.) 103 g, butyl acrylate (BA) 69 g, 2,2,6,6-pentamethyl-4-piperidyl methacrylate (LA- 79 g (manufactured by Hitachi Chemical Co., Ltd.) was weighed. Thereafter, nitrogen gas was passed at room temperature for about 1 hour to dissolve dissolved oxygen, pressurize and seal the inside of the autoclave, and raised the temperature to 65 ° C. Then, azobisisobutyronitrile (AIBN, AIBN, 3.0 g of Wako Pure Chemical Industries, Ltd.) and 1.0 g of azobiscyclohexanone-1-carbonitrile (ACHN, manufactured by Wako Pure Chemical Industries, Ltd.) are dissolved in 40 g of acetone, and nitrogen gas is added at room temperature to about 10 g. After passing through for a minute, a mixed solution in which dissolved oxygen was replaced was added. Thereafter, the same temperature was maintained for about 18 hours. Thereafter, the temperature was raised to 90 ° C. and maintained at the same temperature for about 6 hours to obtain a polymer solution. At this time, the polymerization rate was 98% or more, and the weight average molecular weight was 65,000.

(Preparation of laminated film)
The obtained polymer A varnish and polymer B varnish were used as a resin at a solid content ratio of 4: 6, and SH28PA (dimethylpolysiloxane copolymer modified with a side chain having a polyoxyethylene structure) was used as a release agent. ) (Toray Dow Corning Co., Ltd., having the following structure)

Wherein n is about 1000, m is about 400, and R is an alkyl group or hydrogen.
Was added to the resin at 0.05%. The solution was applied to a raw PET (Cosmo Shine A-4150, Toyobo Co., Ltd.) at a speed of 3 m / min using a Hirano Techseed comma coater head coating machine, and continuously dried at 50 ° C. For 3 minutes and a drying path at 140 ° C. for 3 minutes to obtain a laminated film for evaluation. The film thickness of the used raw PET was 125 μm, the film thickness accuracy was 1.5 μm, and the surface smoothness of the coated surface was 5 nm.

[Example 2]
In this example, the same procedure as in Example 1 was used except that the amount of SH28PA (manufactured by Dow Corning Toray Co., Ltd.) as a release agent was 0.20% with respect to the resin.

[Example 3]
In this example, the same procedure as in Example 1 was used except that the thickness of the light transmission layer was set to 100 μm.

[Example 4]
In this example, the same procedure as in Example 1 was used except that the thickness of the light transmitting layer was set to 50 μm.

[Example 5]
In this example, the same procedure as in Example 1 was used except that Cosmoshine A-4100 (Toyobo Co., Ltd.) was used for the base material layer. The film thickness of the used raw PET is 100 μm, the film thickness accuracy is 1.5 μm, and the surface smoothness is 12 nm.

[Example 6]
In this example, the following hard coat precursor was applied and laminated on the light transmitting layer of the laminated film produced in Example 1, and then cured by heating to form a hard coat layer, which was used as a laminated film for evaluation. .

(Hard coat precursor)
1,200 g of butanol (manufactured by Wako Pure Chemical Industries, Ltd.) was charged as a solvent into a 4-liter stainless steel autoclave having a pressure resistance of 2.3 kg / cm ² G, and 32 g of tetraethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd.) and methyltriethoxy were added. 187.6 g of silane (manufactured by Shin-Etsu Chemical Co., Ltd.) and 180.4 g of dimethyldiethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd.) were weighed, and 80 g of distilled water was added with stirring. Thereafter, 0.04 g of a 10% potassium hydroxide solution was added, and the temperature was raised to 60 ° C. while stirring. The same temperature was maintained for 2 hours to obtain a hard coat precursor. The solid content at this time was 20%.

(Formation of hard coat layer)
3.3% by weight of a 15% aqueous solution of tetramethylammonium hydroxide (manufactured by Wako Pure Chemical Industries, Ltd.) was added to the solid content of the obtained hard coat precursor to prepare a hard coat precursor solution. This solution was applied on the film prepared in Example 1 above using a Hirano Techseed comma coater head coating machine, and continuously passed through a drying path at 50 ° C. for 3 minutes and a drying path at 150 ° C. for 3 minutes. To form a laminated film. Since the thickness of the laminated film at this time was 82.9 μm, the thickness of the hard coat layer becomes 3.0 μm by subtracting the thickness of the light transmitting layer.

[Comparative Example 1]
In this comparative example, the same procedure as in Example 1 was used, except that SH28PA (manufactured by Dow Corning Toray Co., Ltd.) as a release agent was not added.

[Comparative Example 2]
In this comparative example, the same procedure as in Example 1 was performed except that the amount of SH28PA (manufactured by Dow Corning Toray Co., Ltd.) as a release agent was 1.00% with respect to the resin.

With respect to each of the films for evaluation produced in Examples 1 to 6 and Comparative Examples 1 and 2, each characteristic was evaluated using the measurement methods described below.
[Glass transition temperature (Tg)]
Measured by DVA. As a measuring device, a rheospectra DVE-V4 manufactured by UBM was used. The measurement conditions were as follows: the tensile modulus was measured at a temperature rising rate of 3.0 ° C./min and a frequency of 10.0 hz, and the peak top of tan δ in the obtained data was defined as Tg.

[Haze (%)]
The haze (cloudiness value) was measured at room temperature (25 ° C.) using a haze meter (HGM-2, manufactured by Suga Test Instruments Co., Ltd.).

[Light transmittance (%)]
The light transmittance of the film was measured using a spectrophotometer at room temperature (25 ° C.) in a wavelength region of 405 nm. The measuring instrument used was V-570 manufactured by JASCO.

[Hue (Yellowness Index) (%)]
The hue (yellowness) of the film was measured for a yellowness index using a color difference meter (COH-300A manufactured by Nippon Denshoku Industries Co., Ltd.).

[Birefringence (nm)]
The birefringence was measured using a 50 μm thick film using an ellipsometer AEP-100 manufactured by Shimadzu Corporation.

[Static friction coefficient]
The coefficient of static friction is such that a film is laminated on a glass substrate of 20 cm × 20 cm, and a PET film (Cosmo Shine A4150) is attached on the bottom of a cylindrical body having a bottom surface of 3 cm in diameter, a height of 2 cm and a weight of 75 g. The angle at which the cylindrical body began to move when the film was tilted was defined as θ, and the static friction coefficient μ = tan θ (θ: the angle at which the cylindrical body began to move) was calculated from the angle θ to obtain the static friction coefficient μ.

[Bendability]
The presence or absence of cracks and the degree of whitening when the film was bent were visually observed. When no crack or whitening phenomenon was observed, the evaluation was evaluated as ○, and when observed, the evaluation was evaluated as ×.

[Film thickness (μm), film thickness error (μm)]
The film thickness of the film was measured for a square film having a size of 12 cm × 12 cm using a laser focus displacement meter (manufactured by Keyence, LT-8100).

  The four sides of the square film were designated as straight line A, straight line B, straight line C, and straight line D, respectively, the side facing straight line A was taken as straight line C, and the side facing straight line B was taken as straight line D. Three parallel straight lines spaced 3 cm from the straight line A to the straight line C are referred to as a straight line A1, a straight line A2, and a straight line A3, respectively. These three parallel straight lines (A1, straight line A2, straight line A3) and straight line A And a total of five straight lines C, the thickness of the film at each point on the straight line was measured by the following procedure. First, a point 1 cm inside the square from one end of the straight line A is used as a reference point. For each point spaced 1 mm from the reference point toward the other end of the straight line A, from the other end to a point 1 cm inside the square. The film thickness of the film was measured at a total of 101 points over a length of 10 cm. Next, using the same method as that for the straight line A, the film thickness at each point of the straight line A1, the straight line A2, the straight line A3, and the straight line C was measured. It was measured. Further, similarly to the above-described straight lines from the straight line A to the straight line C, a total of 505 straight lines (straight line B, straight line B1, straight line B2, straight line B3, and straight line D) from the straight line B to the straight line D are obtained. The film thickness was measured for the points. Finally, the average value of the film thickness of a total of 1010 pieces in the square film measured by the method described above was defined as the film thickness.

  Further, a value obtained by subtracting the average film thickness from the maximum value of the film thickness and a value obtained by subtracting the minimum value of the film thickness from the average film thickness were calculated, and a larger value among the calculated values was regarded as a film thickness error.

[Surface smoothness (nm)]
As for the surface smoothness, irregularities at a width of 15 μm were measured. In the measurement, AFM manufactured by SEIKO INSTRUMENT was used. The points at which the irregularities at a width of 15 μm were obtained were measured at a total of 5 points: a point at the center of the film, which is a square of 12 cm × 12 cm, and a point 1 cm inside from the center of each of the four sides. Was defined as surface smoothness.

[Hardness]
The film applied to the raw PET was cut into a size of 15 cm × 1 m. With the light-transmitting layer film side down and the film flat, the cut side of the film is set at room temperature (25 ° C.) and at a mold release speed of 100 mm / sec, with the short side of the rectangle as the upper base. From the left side to the right side of the upper base, peel off all the upper base so that the amount of peeling always increases on the short side compared to the long side and the short side, and then peel off so that the left and right sides are at the same position, The raw PET was peeled toward the lower bottom. At this time, the peeled PET film was peeled so as to have a height of 30 cm or less. The value of the hardness was determined by measuring the number of remaining pieces peeled off from the raw PET. Measurements number are each a five, the value measures the total number was expressed in terms of number per 1 m ^2.

[Pencil hardness of hard coat layer]
After adding 3.3% by weight of a 15% aqueous solution of tetramethylammonium hydroxide (manufactured by Wako Pure Chemical Industries, Ltd.) to the solid content of the hard coat precursor, the mixture was coated on a glass plate and then heated at 50 ° C./3. Immediately after the minute, the mixture was heated at 150 ° C. for 3 minutes to form a hard coat layer, and its pencil hardness was measured according to JIS K5400.

[Scratch resistance of laminated film]
The abrasion resistance of the laminated film was measured using a wear tester at a load of 250 g, a worn wheel CSF-1, and the number of rotations was 100. The haze after the test was used as a measure of the abrasion resistance.

Table 1 shows the results measured by the above measurement method.

As shown in Table 1, each of the films of Examples 1 to 5 to which a predetermined amount of silicone resin was added had high optical transmittance, low haze, and low birefringence, and thus had good optical characteristics. In addition, the number of peeling remaining pieces per 1 m ³ was 3 or less, and the releasability was good. However, each of the films of Comparative Example 1 had a large value of the resilience, and an excessive amount of silicone. The film of Comparative Example 2 to which the film was added had no sharpness, became cloudy and had a high haze, and the transmittance was lower than the reference value and the optical characteristics were deteriorated. Also, by forming the hard coat layer on the light transmitting layer as in Example 6, the scratch resistance of the laminated film can be improved.

  Therefore, according to the present embodiment, by mixing two or more kinds of vinyl polymers, it is possible not only to obtain new characteristics that cannot be obtained with one kind of vinyl polymer, but also to have good releasability. A laminated film for an optical component can be obtained, and by applying the laminated film for an optical component to an optical component such as an optical disk, the density and precision of the optical component can be increased. As a result, it is possible to increase the recording capacity required for an optical disk or the like with the development of video information, moving image information, and the like.

  Moreover, since the laminated film for optical parts of the present invention can be formed into a rolled film by winding the film into a roll while maintaining the surface smoothness, the workability can be improved.

  In the present embodiment, as a specific application of the laminated film for an optical component of the present invention, a DVD having a large capacity is given as an example. However, the optical component is not limited to this. It can also be used as a substrate film for liquid crystal touch panels, a substrate film for flexible displays, a retardation film for liquid crystal panels, and the like.

FIG. 1 is a perspective view showing a partial structure of a high-density DVD according to an embodiment of the present invention. FIG. 2 is an exemplary sectional view showing the structure of a part of the high-density DVD shown in FIG. 1;

Explanation of reference numerals

1 High density DVD
2 support base 3 recording layer 4 adhesive layer 5 light transmitting layer 6 laser beam

Claims (24)

  A light-transmitting layer containing a silicone resin and mainly composed of a thermoplastic resin and having a birefringence of 20 nm or less and a haze of less than 1%; a resin base layer laminated with the light-transmitting layer and peeled off during use; And a laminated film for an optical component.   A hard coat layer having a pencil hardness of 3H or more is formed on the light transmitting layer, and the resin base material layer is laminated on the hard coat layer or on the light transmitting layer opposite to the hard coat layer. The laminated film for an optical component according to claim 1, wherein:   3. The laminated film for an optical component according to claim 2, wherein the thickness of the hard coat layer is 0.5 to 8 [mu] m, and the thickness accuracy is within ± 1.0 [mu] m.   4. The laminated film for an optical component according to claim 2, wherein the hard coat layer is a crosslinked structure.   The laminated film for an optical component according to any one of claims 2 to 4, wherein the hard coat layer is a silicone-based crosslinked structure or an acrylic-based crosslinked structure.   The laminated film for an optical component according to any one of claims 2 to 5, wherein the hard coat layer contains 0.2 to 10.0% by weight of a silicone-based thermoplastic resin.   The laminated film for an optical component according to any one of claims 1 to 6, wherein the light transmitting layer has a thickness of 15 to 250 µm, and the thickness accuracy is within ± 2.0 µm.   The optical component laminated film according to any one of claims 1 to 7, wherein the light transmission layer has a light transmittance at 405 nm of 87% or more.   The laminated film for an optical component according to any one of claims 1 to 8, wherein a surface smoothness of the resin base material layer on the light transmission layer side is 20 nm or less. 2. The method according to claim 1, wherein, under conditions of 25 ° C. and a mold release speed of 100 mm / sec, the peeling residue due to the stiffness when the light transmitting layer is separated from the resin base material layer is 3 or less per 1 m ^2. 10. The laminated film for optical parts according to any one of claims 9 to 9.   The laminated film for an optical component according to any one of claims 1 to 10, wherein the light transmission layer has a coefficient of static friction against PET at 25 ° C of 0.42 or less.   12. The laminated film for an optical component according to claim 1, wherein the resin base material layer has a thickness of 20 to 250 μm, and the thickness accuracy is within ± 1.0 μm. 13.   13. The laminated film for an optical component according to claim 1, wherein the thermoplastic resin is a vinyl polymer.   The vinyl-based polymer includes a vinyl-based polymer A containing at least one proton-donating atomic group in a molecule and a vinyl-based polymer B containing at least one proton-accepting atomic group in a molecule. 14. The laminated film for an optical component according to claim 13, wherein a pseudo cross-link is formed between the proton-donating atomic group and the proton-accepting atomic group by an intermolecular hydrogen bond.   The vinyl polymer A is obtained by polymerizing a monomer mixture containing a vinyl monomer having one or more functional groups selected from carboxyl groups, hydroxyl groups or phenolic hydroxyl groups in the molecule. The vinyl polymer B is a polymer obtained by polymerizing a monomer mixture containing a vinyl monomer having a nitrogen atom in the molecule, and the vinyl polymer The glass transition temperature of either one of the coalesced A and the vinyl polymer B is 25 ° C. or more, and the other glass transition temperature is less than 25 ° C., The optical component laminate according to claim 14, wherein the film.   The laminated film for an optical component according to any one of claims 13 to 15, wherein the vinyl polymer is an acrylic resin.   The laminated film for an optical component according to any one of claims 1 to 16, wherein the silicone resin is contained in an amount of 0.01 to 0.5% by weight based on the thermoplastic resin.   The laminated film for an optical component according to any one of claims 1 to 17, wherein the resin base material layer is mainly made of a polyester resin.   19. The laminated film for an optical component according to claim 1, wherein the light transmitting layer is used for a light transmitting layer of an optical disk.   20. A film wound layered product formed by winding the laminated film for an optical component according to any one of claims 1 to 19 into a roll shape.   An optical component formed by attaching a light transmitting layer peeled from a resin substrate layer of the laminated film for an optical component according to any one of claims 1 to 19.   The optical component according to claim 21, which is an optical disk.   20. An optical disc in which a recording layer, an adhesive layer, and a light transmitting layer are sequentially formed on a support base, wherein the light transmitting layer is formed of the laminated film for an optical component according to any one of claims 1 to 19. An optical disc, which is obtained by peeling a material layer, is a film mainly containing a thermoplastic resin and containing a silicone resin, and has a birefringence of 20 nm or less and a haze of less than 1%.   24. The optical disc according to claim 23, wherein a hard coat layer having a pencil hardness of 3H or more is further formed on the light transmitting layer.

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