JP2006196043A - Laminated film for optical component, film wound body, optical component, and optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated film for an optical component having smooth optical characteristics without any defect and foreign matter, satisfactory surface smoothness and satisfactory operability in manufacture, wherein transfer of a bubble part to a light transmission layer and peeling difficulty in an interleaf insertion method or a winding method together with a base material for improving aggravation of re-feed-out properties due to mutual sticking of light transmission layers are further improved when the film-shaped light transmission layer having both characteristics of thermal resistance and toughness is made to be a wound body, also to provide a film wound body, to provide the optical component and to provide an optical disk. <P>SOLUTION: The light transmission layer having 20 to 250 μm film thickness, film thickness accuracy within ±2.0 μm and ≥90% light transmittance in 405 nm wavelength and a protection layer, whose surface in contact with the light transmission layer is subjected to peelable adhesion treatment, are separately formed and then laminated to form a two layered laminated film to be the laminated film for the optical component having 30 to 350 μm film thickness. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a laminated film for an optical component, a film wound layer, an optical component, and an optical disc that can be applied as a member of an optical component such as a high-density DVD, organic EL, flexible display, or electronic paper having a large capacity.

In an optical disc, a recording layer on which signal information consisting of bit strings and grooves consisting of fine irregularities is formed on a support base made of a transparent plastic base is formed from the side facing the surface on which the recording layer is formed. This is a system for reading out information by irradiating a laser beam or the like and changing the amount of reflected light according to the signal information on the support base.
Examples of such optical disks include compact disks (CDs), DVDs (Digital Versatile Disks), and magneto-optical recording disks. In a CD that is a typical optical disc, a transparent light-transmitting layer for reading information is formed on a support base having a thickness of 0.6 mm, and the light-transmitting layer also serves as a support base having a recording layer. It is. The CD uses laser light having a wavelength of 780 nm for recording / reproducing, and irradiates the recording / reproducing laser light from the light transmitting layer side, and signal information including bit strings and grooves engraved on the recording layer on the support substrate. The information recorded on the recording layer is reproduced based on the amount of reflected light that changes in accordance with.

In an optical disk typified by a DVD having a higher recording capacity than a CD, the laser wavelength for recording / reproducing is 635 nm. Basically, like the CD described above, the recording layer is irradiated with laser light to signal information. Recording and playback.
FIG. 3 is an enlarged perspective view of a part of the DVD for schematically explaining the structure of the DVD, and FIG. 4 is a sectional view thereof. As shown in FIGS. 3 and 4, the DVD 10 includes a support base 11, a recording layer 12 formed on the support base 11, and a light transmission layer 13 formed on the recording layer 12. More specifically, the thickness of the transparent support base 11 from which information is read out in a single layer plate is 0.6 mm, and information such as bits 14 and recording grooves are recorded on the support base 11. The recording layer 12 is formed, and a transparent support base having the same thickness (0.6 mm) as the support base 11 is laminated on the recording layer 12 to form a light transmission layer 13. The light transmission layer 13 formed on the recording layer 12 is generally called “dummy” and plays a role of improving the strength of the optical disc itself. As shown in FIGS. 3 and 4, the laser beam 15 is irradiated from the light transmission layer 13 side to record and reproduce information on the recording layer.
Furthermore, with the development of video information and video information in recent years, DVDs with a large recording capacity have been demanded, and the development of high-density DVDs with a recording capacity exceeding 20 GB called a next-generation disk has been promoted. It has been. A high-density DVD is 12 centimeters in diameter and is the same size as the conventional one. Therefore, it is required to reduce the track pitch in the recording layer or reduce the bit length so as to increase the density. ing.
Specifically, a recording layer on which signal information is recorded by a bit string or a groove is formed on a support base having a thickness of about 1.1 mm, and a transparent film having a thickness of about 0.1 mm is formed on the surface of the recording layer. Are bonded to form a light transmission layer. Then, signal information is recorded and reproduced by irradiating a blue laser with a short wavelength of about 400 nm from the surface side of the light transmission layer.
Polycarbonate is usually used as the light transmission layer which is the support base and dummy layer of the above-mentioned CD, DVD and next generation disc, etc., and polycarbonate is also used as the light transmission layer of the next generation disc. Development of new polymer materials to replace them is ongoing.

Typical polymer materials that are being developed include, for example, acrylic resins. Acrylic resins are relatively inexpensive, have high transparency, and are diverse such as rubbery materials and glassy polymers. A polymer having various characteristics can be produced relatively easily, and further, it has excellent properties such as easy modification. However, while having excellent properties, in order to make acrylic resin into a film shape, it is necessary to make the properties of strength, heat resistance and toughness contradict each other. Conventional acrylic resins satisfy both of the above properties. Because it is difficult to do so, it has been a big problem. Although it is a problem that the toughness is low in common with all acrylic resins, for example, several methods for increasing the toughness of a film formed from an acrylic resin by adding rubber particles to the resin have been reported (patents) Reference 1 and Patent Reference 2). However, although it is possible to improve the toughness of the film by adding rubber particles to the resin, a whitening phenomenon occurs when the film is folded, and the folding processability of the film is lowered. For this reason, an acrylic resin that has both a glass transition point at room temperature (25 ° C.) or higher and a thin film film forming ability (folding workability) that requires toughness has not been found.
Therefore, for example, one or more synthetic polymers were mixed to form hydrogen bonds between molecules to give a pseudo-crosslinked structure, introducing new characteristics that could not be realized with conventional materials. A resin composition has been developed (see Patent Document 3). For example, an acrylic polymer containing a hydroxyl group that is a proton-donating atomic group as a polymer having a low glass transition temperature, and an acrylic polymer containing an amine group that is a proton-accepting atomic group as a polymer having a high glass transition temperature. It has been reported that a film for a light transmission layer having both heat resistance and toughness properties obtained as a pseudo-crosslinked structure by blending coalesces and forming hydrogen bonds between molecules can be obtained (see Patent Document 4). ).

Japanese Patent Publication No. 58-167605 Japanese Patent Laid-Open No. 3-52910 JP 2000-273319 A JP 2002-38036 A

Since the film for a light transmission layer produced by the above method can obtain both characteristics of heat resistance and toughness, this film is used to produce an optical component such as an optical disk. However, the light transmissive layer produced by this method has a problem in that it is difficult to re-feed out because the light transmissive layers are stuck to each other when wound alone.
Therefore, in order to solve this problem, a method of winding the interleaf paper or the like without taking it off from the base material layer has been studied. The latter can be wound while maintaining the surface smoothness, but in order to obtain a light-transmitting layer with good surface smoothness, the base material layer used is smooth and adheres well. Since it is necessary to use a material having high properties, it is difficult to remove the base material layer after processing, so that the problem of the winding shape has not been solved since it is not practical.

In optical disks such as high-density DVDs with increased capacity, as described above, if there are large defects or foreign objects compared to the wavelength of the laser beam used on the film surface, there will be problems such as reading errors. There was a problem that the characteristics deteriorated. For this reason, the film which comprises an optical component is requested | required that the surface should be smooth.
The present invention is for solving the above-described problems, and has a good optical property and surface smoothness, and a good laminated film for optical parts, a film wound layer, and an optical part with good workability during production. And to obtain an optical disc.

As a result of various studies conducted by the present inventors in order to achieve the above object, it was found that forming a film having a two-layer laminated structure exhibiting specific characteristics eliminates defects and foreign matters on the film surface, thereby completing the present invention. It has been made. Moreover, since it was set as the two-layer laminated film using the protective film which performed the light peeling adhesion process, it discovered that workability | operativity at the time of manufacture could also be improved.
That is, the present invention relates to the following items.
[1] A light transmissive layer having a film thickness of 20 to 250 μm, a film thickness accuracy of within ± 2.0 μm, and a light transmittance at 405 nm of 90% or more, and peeled and removed during use, and the light transmissive layer A laminated film body for an optical component having a thickness of 30 to 350 μm, which is a two-layer laminated film obtained by separately forming a protective layer whose surface in contact with the surface is peeled and bonded.
[2] The laminated film for optical components according to [1], wherein the protective layer has a film thickness accuracy within ± 2.0 μm on the surface in contact with the light transmission layer.
[3] The laminated film for optical parts according to [1] or [2], wherein the protective layer has a film thickness accuracy of ± 2.0 μm or less on a surface that has not been peeled and bonded.
[4] The laminated film for optical components according to any one of [1] to [3], wherein the light transmission layer is mainly composed of an acrylic polymer.
[5] The light transmission layer includes a vinyl polymer A containing at least one proton-donating atomic group in the molecule and a vinyl polymer B containing at least one accepting atomic group in the molecule. In addition, by mixing the vinyl polymer A and the vinyl polymer B, heat in which pseudo-crosslinking due to intermolecular hydrogen bonding is formed between the proton-donating atomic group and the proton-accepting atomic group The laminated film for optical components according to any one of [1] to [4], which is mainly composed of a plastic resin.
[6] The laminated film for optical components according to any one of [1] to [5], wherein the protective layer has a thickness of 10 to 200 μm.
[7] The laminated film for an optical component according to any one of [1] to [6], wherein the protective layer peeling adhesion treatment is a mold release treatment by applying a polymer compound onto the protective layer.
[8] The laminated film for optical components according to any one of [1] to [7], wherein the protective layer is mainly made of polyethylene, polypropylene, and polyester resin.
[9] A film winding layer formed by winding the laminated film for optical components according to any one of [1] to [8] into a roll shape.
[10] An optical component formed by attaching a light transmission layer peeled off from the protective layer of the laminated film for optical components according to any one of [1] to [8].
[11] The optical component according to [10], which is an optical disk.
[12] An optical disc in which a recording layer, an adhesive layer, and a light transmission layer are sequentially formed on a support substrate, wherein the light transmission layer is the laminated film for optical components according to any one of [1] to [8]. An optical disc that is formed using.

  According to the present invention, it is possible to obtain a laminated film for optical parts, a film wound layer, an optical part, and an optical disk that have good optical properties and surface smoothness and good workability during production. In particular, by forming a film with a two-layer laminate structure that exhibits specific characteristics, defects and foreign matter can be eliminated on the film surface, and a two-layer laminate film using a protective film that has been subjected to a light release adhesive treatment is used. In addition, workability during manufacturing can be improved.

The present invention provides a light transmissive layer having a film thickness of 20 to 250 μm, a film thickness accuracy of within ± 2.0 μm, and a light transmittance of 90% or more at 405 nm, and is peeled and removed at the time of use. It is a two-layer laminated film in which a protective layer whose surface in contact with the layer is peeled and bonded is laminated, and is a laminated film for optical parts having a thickness of 30 to 350 μm.
In the present invention, the film thickness of the two-layer laminated film is defined as 30 μm to 350 μm, but when the film thickness is less than 30 μm, the surface smoothness and workability deteriorate, and when the film thickness exceeds 350 μm, the surface smoothness and 405 nm This is because the light transmittance is deteriorated. The film thickness of the two-layer laminated film is preferably 35 to 300 μm, more preferably 40 to 250 μm. Further, the film thickness accuracy of the light transmission layer is within ± 2.0 μm, and the light transmittance is 90% or more. In addition, the measurement of a film thickness, film thickness precision, and light transmittance is demonstrated in the Example mentioned later.

  The laminated film for optical components has a light transmissive layer having a light transmissive layer thickness of 20 to 250 μm, a film thickness accuracy within ± 2.0 μm, and a light transmittance at 405 nm of 90% or more. And This is because when the thickness of the light transmission layer is less than 20 μm, the surface smoothness and workability are poor, and when the thickness exceeds 250 μm, the surface smoothness and the light transmittance of 405 nm are deteriorated. Moreover, it is preferable that the film thickness of a light transmissive layer is 25-200 micrometers, More preferably, it is the range of 25-150 micrometers. In addition, the film thickness accuracy of the light transmission layer is within ± 2.0 μm, and the light transmittance is 90% or more.

On the other hand, the film thickness of the protective layer is preferably 15 to 150 μm, more preferably 20 to 125 μm, the film thickness accuracy is within ± 2.0 μm, more preferably within ± 1.0 μm, and the surface smoothness is 20 μm. The following is preferable. This film thickness accuracy is within ± 2.0 μm for both the film thickness accuracy of the surface in contact with the light transmission layer and the film thickness accuracy of the surface not in contact with the light transmission layer (surface that does not require the peel adhesion treatment). It is preferable.
The measurement of the film thickness in the present invention, a laser focus displacement meter (manufactured by Keyence Corporation, LT-8010) with, any size for (e.g. ^{1cm 2 ~10000cm} 2 in the plane), from the whole appropriate (e.g. (25 to 1000 points) Measurement points can be selected and measured, and the average value can be taken as the film thickness.

  In the protective layer according to the present invention, the surface in contact with the light transmission layer is peeled and bonded. Here, the peeling adhesion treatment means that the layer is adhered to the light transmission layer in a state where it is easy to peel off, and specifically, there are those subjected to various mold release treatments. Examples of the mold release treatment include a method of depositing an inorganic thin film such as fluorinated magnesium, fluorinated silicon oxide (SiOF), or silicon nitride on the base material layer by vapor deposition, or a solvent-soluble fluorination. Examples thereof include a method of applying an olefin polymer or a polymer having a cyclohexane structure onto a roll by dipping or the like, drying the solvent, and forming a film on the substrate layer. The mold release treatment method for the base material layer shown here is merely an example, and is not limited to these methods, but a mold release treatment by applying a polymer compound is preferable.

In the laminated film for optical parts, the light transmission layer is preferably mainly composed of an acrylic polymer.
Furthermore, in the above laminated film for optical parts, the light transmission layer includes a vinyl polymer A containing at least one proton-donating atomic group in the molecule and a vinyl containing at least one accepting atomic group in the molecule. A polymer B, and by mixing the vinyl polymer A and the vinyl polymer B, an artificial hydrogen bond between the proton-donating atomic group and the proton-accepting atomic group is generated between the proton-donating atomic group and the proton-accepting atomic group. It is preferable to mainly consist of a thermoplastic resin in which cross-linking is formed.

  This light-transmitting layer is formed from a vinyl polymer in which two or more types of vinyl polymers having different characteristics are mixed and a pseudo-crosslink is formed between the molecules. Although the expression is used, this is because the crosslinking of the vinyl polymer is cut by heat or a solvent below the thermal decomposition temperature, and when the temperature is lowered or the solvent is removed, the crosslinked structure is re-formed. . By forming a film using the vinyl polymer, it becomes possible to wait for a plurality of characteristics that cannot be obtained when a film is formed from one 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 to mix both vinyl polymers to form pseudo-crosslinks. By forming pseudo-crosslinks, it is possible to achieve both heat resistance and flexibility characteristics, cancel out positive and negative birefringence, make it zero birefringence, lower birefringence, and give the film opposite characteristics. Also, conflicting characteristics can be introduced by mixing two or more vinyl polymers.

In the above invention, the proton-donating atomic group is a functional group such as carboxyl group, sulfonic acid group, phosphoric acid group, hydroxyl group, phenolic hydroxyl group, mercapto group, thiophenolic mercapto group, primary amino group, and secondary amino group. Preferably, the proton-accepting atomic group includes a carbonyl group, a sulfonyl group, a phosphoryl group, a cyano group, a secondary amino group, a tertiary amino group, a nitrogen-containing heterocyclic group, and the like. It is preferable to use a material selected from the group containing the functional group.
Furthermore, in the above invention, the proton-donating atomic group is preferably selected from the group containing a functional group such as a carboxyl group, a hydroxyl group, and a phenolic hydroxyl group, and the proton-accepting atomic group is a secondary amino group A material selected from the group containing functional groups such as tertiary amino groups and nitrogen-containing heterocyclic groups is preferred.

Moreover, in the said invention, it is preferable that the surface smoothness of a two-layer laminated film, specifically, the unevenness | corrugation in 15 micron width is 20 nm or less.
The laminated film for optical components of the present invention is suitable for a light transmission layer of an optical disc.

Hereinafter, an example in which an optical disk is constructed using the laminated film for optical components of the present invention and a large-capacity high-density DVD exceeding 20 GB will be described.
FIG. 1 is a perspective view showing a partial structure of a high-density DVD, and FIG. 2 is a cross-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 transmission layer 5 is formed on the recording layer 3 via an adhesive layer 4.
The DVD irradiates a short wavelength laser beam 7 of 405 nm from the light transmission layer 5 side to reproduce and record the signal information of the recording layer 3 through the light transmission layer 5, and the high density DVD 1 is a light transmission layer. 5 is thinned.

The laminated film for optical parts of the present invention is a film in which two layers of a protective layer and a light transmissive layer are laminated, and the light transmissive layer of this film is peeled off as a light transmissive layer of a high-density DVD having the above structure. used.
In each layer constituting the high-density DVD, for example, the thickness of the support base 2 is 0.90 mm to 1.15 mm, the thickness of the recording layer 3 is 10 μm to 60 μm, and more preferably the thickness of the support base 2 is 1. It is preferable that the recording layer 3 has a thickness of 15 μm to 50 μm.

The constituent materials of each layer constituting the high-density DVD will be described. The light transmission layer 5 uses the laminated film for optical parts of the present invention, and the support base 2 and the recording layer 3 can be made of the same material as the conventional one. For example, the support base 2 is made of a plastic substrate such as polycarbonate.
The pressure-sensitive adhesive layer 4 can be formed by producing a film using a pressure-sensitive adhesive. Examples of the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 3 include an acrylic pressure-sensitive adhesive, a natural rubber pressure-sensitive adhesive, and ethylene-vinyl acetate. Polymer-based adhesives, silicone-based adhesives, ester-based adhesives, and the like can be selected. In particular, it is preferable to use an acrylic adhesive as the adhesive. However, the pressure-sensitive adhesive shown here is only an example, and is not limited thereto.

When producing a film as the adhesive layer, a film in which an adhesive is previously applied to a substrate can be used. For example, polyethylene film, polypropylene-based elastomer film, polyolefin-based elastomer film, polyester film, polyvinyl chloride film, polycarbonate cellophane film, acetate film, various fluorine films, polyimide film, etc. are selected as the base material for applying the adhesive. can do. However, the base material for applying the pressure-sensitive adhesive shown here is an example, and is not limited thereto.
Further, it is particularly preferable that the adhesive layer is laminated on the film after the film is applied and dried. However, the time when the adhesive layer is laminated on the film shown here is an example, and is not limited thereto.

  The protective layer according to the present invention has a peel-bonded surface provided on the light-transmitting layer side, and the same treatment can be provided on the opposite surface as necessary. As a protective layer for a film having a two-layer structure, for example, polyethylene film, polypropylene film, PET film, PEN film, stainless steel, Teflon (registered trademark) film, polyester film, polysulfone film, polyethersulfone film, polyetheretherketone film A polyether film, a polyamideimide film, a polyimide film, a polycarbonate film, an acrylic resin film, an epoxy resin film, a norbornene-based polymer and a resin blended with these can be selected. The protect layer shown here is an example, and is not limited to the above-described film.

The film obtained by the above method has toughness and flexibility, is excellent in mechanical properties, and can easily maintain its shape.
The light transmission layer 5 is a film mainly formed of a thermoplastic resin, and this thermoplastic resin is composed of a vinyl polymer A containing at least one proton-donating atomic group in the molecule and at least one type in the molecule. It is preferable that it is a vinyl polymer containing the vinyl polymer B containing the said receptive atom group. This vinyl polymer is obtained by mixing both the vinyl polymer A and the vinyl polymer B so that pseudo-crosslinking is caused by intermolecular hydrogen bonding between the proton-donating atomic group and the proton-accepting atomic group. It is preferable that is formed.

  Examples of the vinyl monomer for producing the vinyl polymer A containing at least one proton donating atomic group in the molecule include acrylic acid, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 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-methacryloyloxy Tylhexahydrophthalic acid, 2-methacryloyloxyethyl-2-hydroxypropyl phthalate, 2-methacryloyloxyethyl acid phosphate, 2-hydroxy-3-methacryloyloxypropyl acrylate, vinyl benzoic acid, vinyl benzoate and derivatives thereof Etc. However, the compound shown here is an example and is not limited thereto.

  Examples of the vinyl monomer for producing the vinyl polymer B containing at least one proton-accepting atomic group in the molecule include dimethylaminoethyl acrylate, diethylaminoethyl acrylate, dimethylaminoethyl acrylate, (Meth) acrylamides such as dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, dimethylaminoethyl methacrylate, acrylamide, methacrylamide, N-dimethylacrylamide, N-diethylacrylamide, N-dimethylmethacrylamide, N-diethylmethacrylamide, vinylpyridine And derivatives thereof. However, the compound shown here is an example and is not limited thereto.

Furthermore, for each of the vinyl polymer A containing at least one proton-donating atomic group in the molecule and the vinyl polymer B containing at least one proton-accepting atomic group in the molecule, a description will be given later. It is possible to copolymerize with other vinyl polymers. The monomer that can be used is not particularly limited as long as it does not impair the transparency of the resulting copolymer. Specific examples include methyl acrylate, ethyl acrylate, propyl acrylate, and 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, acrylic acid Phenyl, benzyl acrylate, naphthyl acrylate, glycidyl acrylate, 2-hydroxyethyl acrylate, cyclohexyl acrylate, methyl cyclohexyl acrylate, trimethyl cyclohexyl acrylate, norbornyl acrylate, norbornyl methyl acrylate, acrylic acid Anonoruboruniru, 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 acid, pentyl methacrylate, n-hexyl methacrylate, 2-ethylhexyl methacrylate, n-octyl methacrylate, dodecyl methacrylate, octadecyl methacrylate, butoxyethyl methacrylate, phenyl methacrylate, naphthyl methacrylate, Glycidyl tacrylate, cyclopentyl methacrylate, cyclohexyl methacrylate, methyl cyclohexyl methacrylate, trimethyl cyclohexyl methacrylate, norbornyl methacrylate, norbornyl methyl methacrylate, cyano norbornyl methacrylate, phenyl norbornyl methacrylate, isobornyl methacrylate Boronyl methacrylate, menthyl methacrylate, fentyl methacrylate, adamantyl methacrylate, dimethyladamantyl methacrylate, tricyclo [5.2.1.0 ^2,6 ] deca-8-yl methacrylate, 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- Aromatic vinyl compounds such as roll styrene, α-bromostyrene, fluorostyrene, chlorostyrene, bromostyrene, methylstyrene, methoxystyrene, calcium acrylate, barium acrylate, lead acrylate, tin acrylate, zinc acrylate, methacrylic acid (Meth) acrylic acid metal salts 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-cyclohex Rumaleimide, 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. Moreover, you may use these by 1 type (s) or 2 or more types. However, the compound shown here is an example and is not limited thereto.

In the present invention, the vinyl polymer A containing at least one proton-donating atomic group in the molecule and the vinyl polymer B containing at least one proton-accepting atomic group in the molecule are mixed. As a method of performing, a melt-kneading method, a varnish blending method, or the like can be applied, and any method can be used.
Moreover, as a polymerization method for producing a resin composition for forming a film for a light transmission layer, existing methods such as bulk polymerization, suspension polymerization, emulsion polymerization, and solution polymerization can be used.
When performing the polymerization, a polymerization initiator can be used. Specifically, benzoyl peroxide, lauroyl peroxide, di-t-butylperoxyhexahydroterephthalate, t-butylperoxy-2-ethylhexanoate, 1,1-t-butylperoxy-3,3 Organic peroxides such as 1,5-trimethylcyclohexane, azo compounds such as azobisisobutyronitrile, azobis-4-methoxy-2,4-dimethylvaleronitrile, azobiscyclohexanone-1-carbonitrile, azodibenzoyl, Any water-soluble catalyst such as potassium persulfate and ammonium persulfate, and a redox catalyst based on a combination of peroxide or persulfate and a reducing agent can be used.

As a molecular weight modifier, a mercaptan compound, thioglycol, carbon tetrachloride, α-methylstyrene dimer or the like can be added as necessary. The molecular weight modifiers shown here may be used alone or in combination of two or more if necessary, but the molecular weight modifiers shown here are merely examples, and the exemplified molecular weight modifiers It is not limited to.
When thermal polymerization is used as the polymerization method, the polymerization temperature can be appropriately selected between 0-200 ° C, and the more preferable polymerization temperature is in the range of 50-120 ° C.
Polymers (light-transmitting layers) must be protected from deterioration, thermal stability, moldability and processability, and other antioxidants such as phenols, phosphites and thioethers, aliphatic alcohols. , Fatty acid esters, phthalate esters, triglycerides, release agents such as fluorosurfactants, higher fatty acid metal salts, other lubricants, plasticizers, antistatic agents, UV absorbers, flame retardants, heavy metal deactivators, etc. May be used.
In the present invention, a film can be obtained by volatilizing an organic solvent from the obtained polymer by a melt-kneading method or a solvent casting method. The casting conditions are not particularly limited. For example, the casting can be performed in air or in an inert gas at a temperature of 50 ° C. to 160 ° C. Moreover, after pre-drying using these conditions, it is possible to peel off a film, and also to dry this at high temperature of 160-350 degreeC, and to shorten drying time.

  In the case of producing a film as a light transmission layer using the above material, a base material layer is preferably selected. Specifically, as the base material layer, PET film, PEN film, stainless steel, Teflon (registered trademark) film, polyester film, polysulfone film, polyethersulfone film, polyetheretherketone film, polyether film, polyamideimide film, A polyimide film, a polycarbonate film, an acrylic resin film, an epoxy resin film, a norbornene-based polymer and a resin blended with the same can be selected. In particular, it is preferable to use a PET film or a PEN film, more preferably a PET film. Good. In addition, the base material layer shown here shows an example, The base material layer should just have favorable surface smoothness, and is not limited to the film mentioned above.

  In the present invention, the light-transmitting layer and the protective layer are laminated to form a two-layer film, but the lamination may be performed either before or after the substrate layer is peeled off. The direction after peeling is preferable because the two-layer film is not damaged by the operation of peeling the substrate layer after lamination.

Example 1
In this example, as the light transmissive layer, a solution for polymer A and polymer B was used to prepare a film for the light transmissive layer on the film of the base layer, and after the substrate film was peeled off, the protective film was protected. A film was laminated and formed into a two-layer laminated film from a light transmitting layer film and a protective film.

(Polymer A) Into a 4 liter stainless steel autoclave having a pressure resistance of 2.3 kg / cm ² G, 1279 g of acetone as a polymerization solvent was charged, 994 g of butyl acrylate (BA, manufactured by Wako Pure Chemical Industries, Ltd.), acrylic acid (AA 86 g of Wako Pure Chemical Industries, Ltd. and 160 g of isopropyl alcohol (IPA, Tokuyama Corporation) were weighed. Thereafter, nitrogen gas was passed at room temperature (25 ° C.) for about 1 hour to replace dissolved oxygen, and then lauroyl peroxide (LPO, manufactured by NOF Corporation) 0.72 g as a polymerization initiator, t-butylperoxy 0.24 g of 2-ethylhexanate (PBO, manufactured by NOF Corporation), 0.054 g of α-methylstyrene dimer as a molecular weight regulator were dissolved in 40 g of acetone, and nitrogen gas was passed at room temperature for about 10 minutes. A mixed solution in which dissolved oxygen was replaced was added. Thereafter, the inside of the autoclave was pressurized and sealed, and the temperature was raised to 60 ° C., kept at the same temperature for about 20 hours, and then heated to 90 ° C. Thereafter, the polymer solution was obtained by maintaining at the same temperature for about 10 hours. The polymerization rate of the obtained polymer solution was 97% or more.

(Polymer B) Into a 4 liter stainless steel autoclave having a pressure resistance of 2.3 kg / cm ² G, 1279 g of acetone as a polymerization solvent was charged, 810 g of methyl methacrylate (MMA, manufactured by Asahi Kasei Co., Ltd.), tricyclomethacrylate [5. 2.1.0 ^2,6 ] Deca-8-yl (TCDMA, manufactured by Hitachi Chemical Co., Ltd.) 205 g, butyl acrylate (BA) 32 g, 2,2,6,6-tetramethyl-4-piperidyl methacrylate ( 32 g of FA712HM (manufactured by Hitachi Chemical Co., Ltd.) was weighed. Thereafter, nitrogen gas was passed at room temperature for about 1 hour to replace dissolved oxygen, and then 2.88 g of azobisisobutyronitrile (AIBN, manufactured by Wako Pure Chemical Industries, Ltd.) as a polymerization initiator, azobiscyclohexanone-1 -0.96 g of carbonitrile (ACHN, manufactured by Wako Pure Chemical Industries, Ltd.) was dissolved in 40 g of acetone, nitrogen gas was passed at room temperature for about 10 minutes, and a mixed solution in which dissolved oxygen was replaced was added. Thereafter, the inside of the autoclave was pressurized and sealed, the temperature was raised to 60 ° C., and the temperature was maintained for about 20 hours. Furthermore, after heating up to 90 degreeC, it hold | maintained at the same temperature for about 10 hours, and obtained the polymer solution. The polymerization rate of the obtained polymer solution was 97% or more.
The obtained polymer A varnish and polymer B varnish were mixed at a solid weight ratio of 4: 6 to obtain a mixed solution.

<Production of two-layer laminated film>
Using the mixed solution of the polymer A and the polymer B, coating was performed on a base material layer of Cosmo Shine A-4100 (Toyobo Co., Ltd.) using a coating machine of a comma coater head manufactured by Hirano Techseed, and dried. Then, after peeling off the base material layer Cosmo Shine A-4100, using the protection layer of Tretec # 7531 (Toray Industries, Inc., which has been subjected to release treatment with a polymer compound), the release treatment side is This was laminated with a light transmission layer and used as a sample. At this time, the thickness of the two-layer laminated film was 111 μm. Further, the light transmittance at a wavelength of 405 nm in the single film of the light transmissive layer was 92.5%, and the film thickness accuracy was ± 1.6 μm.

(Example 2)
The same operation was performed except that Tretec # 7531 used in Example 1 was changed to Hitarex L-8110 (Hitachi Chemical Co., Ltd., which was subjected to release treatment with a polymer). At this time, the thickness of the two-layer laminated film was 130 μm. Further, the light transmittance at a wavelength of 405 nm in the single film of the light transmissive layer was 92.3%, and the film thickness accuracy was ± 1.8 μm.

(Comparative Example 1)
The same operation was performed except that Tretec # 7531 used in Example 1 was changed to Sanitect PAC-2 (San-A Kaken Co., Ltd., which was not subjected to mold release treatment). The thickness of the two-layer laminated film at this time was 152 μm. Further, the light transmittance at a wavelength of 405 nm in the single film of the light transmissive layer was 91.9%, and the film thickness accuracy was ± 2.1 μm.

Various characteristics of the samples prepared from Example 1, Example 2, and Comparative Example 1 were evaluated using the measurement methods shown below, and the evaluation results are shown in Table 1.
[405 nm light transmittance]
The light transmittance of the light-transmitting layer was measured using a JASCO V-570 spectrophotometer, and the measurement conditions were room temperature (25 ° C.) and a wavelength of 405 nm.
[Film thickness (μm), film thickness accuracy (μm)]
The film thickness was measured on 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 defined as a straight line A, a straight line B, a straight line C, and a straight line D, respectively, a side facing the straight line A was a straight line C, and a side facing the straight line B was a straight line D. Three parallel straight lines spaced from each other by a distance of 3 cm from the straight line A to the straight line C are defined as a straight line A1, a straight line A2, and a straight line A3, respectively, and these three parallel straight lines (straight line A1, straight line A2, straight line A3) and straight line With respect to a total of five lines A and straight line C, the film thickness 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, and for each point spaced 1 mm from the reference point to 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 for 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 for the straight line A1, the straight line A2, the straight line A3, and the straight line C is measured. It was measured. Further, like each of the straight lines from the straight line A to the straight line C described above, a total of 505 each of five straight lines from the straight line B to the straight line D (straight line B, straight line B1, straight line B2, straight line B3, straight line D). The film thickness was measured for the points. Finally, the average value of the film thicknesses for a total of 1010 square films measured by the method described above was taken 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 the larger value among the calculated values was defined as the film thickness accuracy.
[Glass transition temperature (Tg)]
Measured with DVA. As a measuring device, UBM Co., Ltd. Leospectra DVE-V4 was used. The measurement conditions were as follows: the tensile modulus was measured at a heating 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 the glass transition temperature (Tg).

  The laminated film for optical components, which is a two-layer laminated film that is laminated after the protective layer whose surface in contact with the light-transmitting layer of the present invention is peeled and bonded separately is formed, has both heat resistance and toughness characteristics. It has good re-feeding property and good workability during manufacturing. On the other hand, the two-layer laminated film without the protective layer of the comparative example was inferior in re-drawing property and deteriorated workability.

The perspective view which shows the structure of a part of high-density DVD in embodiment of this invention. Sectional drawing which shows the structure of a part of high-density DVD shown in FIG. The perspective view which expanded a part of DVD in order to demonstrate roughly the structure of DVD in a prior art example. Sectional drawing of DVD shown in FIG.

Explanation of symbols

1 High-density DVD
2 Support base 3 Recording layer 4 Adhesive layer 5 Light transmission layer 6 Hard coat layer 7 Laser beam 10 DVD
11 Support base 12 Recording layer 13 Light transmission layer 14 Bit 15 Laser light

Claims (12)

A light transmitting layer having a film thickness of 20 to 250 μm, a film thickness accuracy within ± 2.0 μm, and a light transmittance of 90% or more at 405 nm, and a surface that is peeled and removed during use and is in contact with the light transmitting layer A laminated film for an optical component having a thickness of 30 to 350 μm, which is a two-layer laminated film laminated after a protective layer having been peeled and bonded is separately formed. 2. The laminated film for optical components according to claim 1, wherein the protective layer has a film thickness accuracy within ± 2.0 μm on the surface in contact with the light transmission layer. 3. The laminated film for optical components according to claim 1, wherein the protective layer has a film thickness accuracy of ± 2.0 μm or less on a surface that is not peeled and bonded. The laminated film for optical components according to any one of claims 1 to 3, wherein the light transmission layer is mainly composed of an acrylic polymer. The light transmission layer includes a vinyl polymer A containing at least one proton-donating atomic group in the molecule, and a vinyl polymer B containing at least one accepting atomic group in the molecule, By mixing a vinyl polymer A and a vinyl polymer B, from a thermoplastic resin in which a pseudo-crosslink due to intermolecular hydrogen bonding is formed between the proton donating atomic group and the proton accepting atomic group The laminated film for optical components according to any one of claims 1 to 4, which is mainly used. The laminated film for optical components according to claim 1, wherein the protective layer has a thickness of 10 to 200 μm. The laminated film for an optical component according to any one of claims 1 to 6, wherein the protective layer is peeled and bonded to the protective layer by releasing a polymer compound. The laminated film for optical components according to claim 1, wherein the protective layer is mainly made of polyethylene, polypropylene, or polyester resin. A film winding layer formed by winding the laminated film for optical components according to any one of claims 1 to 8 into a roll shape. The optical component formed by affixing the light transmission layer peeled off from the protective layer of the laminated | multilayer film for optical components of any one of Claims 1-8. The optical component according to claim 10, which is an optical disc. An optical disc in which a recording layer, an adhesive layer, and a light transmission layer are sequentially formed on a support base, wherein the light transmission layer is formed using the laminated film for optical components according to any one of claims 1 to 8. An optical disc.

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