JPWO2007074693A1 - Anti-reflection optical film and method for producing the same - Google Patents

Abstract

A transparent base film is coated with a thermosetting low refractive index layer coating containing a silicone resin material (an oligomer of an alkoxysilane compound, an aminosilane coupling agent, and a silicone graft acrylic polymer) that does not have a fluorine-containing organic substituent. By continuously performing drying and thermosetting in the dryer, there is no quality deterioration due to winding tightening, excellent anti-reflection, antifouling, chemical resistance, scratch resistance, etc. The present invention relates to an anti-reflection optical film, and the anti-reflection optical film having a layer having near-infrared absorption and / or neon absorption is suitable as an optical film for PDP.

Description

  The present invention relates to an optical film. More specifically, the present invention relates to a low-reflection optical film for improving visibility by affixing to the front surface of a display or the like to reduce the reflection of the background and the like, a manufacturing method thereof, and an optical film for a plasma display panel using the same. About.

  Transparent substrates made of glass or transparent plastic are used for displays such as televisions, personal computers, word processors, and video cameras. When observing or recognizing visual information such as characters, figures, still images, and moving images through these transparent substrates, there is a problem of visibility that external light is reflected on the surfaces of these transparent substrates, making it difficult to see the visual information.

  As a method for suppressing such reflection of external light, for example, there is a method of reducing reflection by providing an extremely thin low refractive index layer on the display surface. As a method of providing a low refractive index layer, a low refractive index layer is directly provided on a display surface or a protective film substrate for display protection, or a low refractive index layer is separately provided on a transparent film to obtain a low refractive index. There is a method of bonding the transparent film with a rate layer to the display surface or the substrate surface of the protective film. In addition, in a plasma display panel (hereinafter referred to as PDP), a function of shielding electromagnetic waves that are emitted from the front of the panel and are said to be harmful to the body, a function of shielding near infrared rays that cause malfunction of peripheral devices, red Since a function of shielding electromagnetic waves in the vicinity of a wavelength of 595 nm, which hinders the clearness of light, is required, an optical filter with a composite function having both of these functions and a low reflection function is attached to the front surface of the PDP or directly pasted. For example, a method of reducing the reflection of external light and shielding harmful electromagnetic waves is adopted.

There are a wet coating method and a dry coating method as a method of providing an ultrathin low refractive index layer on various substrates. When trying to obtain a large amount of low refractive index layer in a large area, a method of wet coating the composition for the low refractive index layer on the surface of the transparent substrate film is generally used from the viewpoint of production efficiency and ease of handling of the low reflection product. It is. This method is said to be the most suitable method for the recent enlargement of displays.
In addition, as the size of displays increases and the spread of them to consumers, it is required to improve the performance and reduce the price of anti-reflective optical films, and how to manufacture excellent films at low cost is a major technical issue. ing. Anti-reflective optical films need functions such as anti-fouling, scratch resistance, chemical resistance, and transparency as well as low reflection and surface uniformity. In order to obtain an optical film, it is necessary to reduce the price by developing an inexpensive material for a low refractive index layer and simplifying the process.

  When a low refractive index layer is provided on a transparent substrate film by a wet coating method, the coating film is generally cured by a heat curing method or an active energy ray curing method. Ultraviolet rays are most commonly used for the active energy ray curing method. The advantage of the ultraviolet curing method is that the surface can be continuously cured in the process flow by installing an ultraviolet irradiation device at the place where the film passes after drying because of curing by ultraviolet irradiation. The merit of the thermosetting method is that an expensive facility such as an ultraviolet curing device is not necessary and only a heat source is required. However, the thermosetting method has the following problems (1) to (3). Usually, in the thermosetting method, after coating the coating material for the low refractive index layer, drying the coating layer, and winding up the obtained film onto a roll, the obtained roll film is heated in a thermosetting chamber. Harden. However, in this method, (1) since the base film usually has a property of heat shrinking at a high temperature, when the thermosetting temperature is higher than the temperature at which the film starts to heat shrink, the heat shrinkage of the film The roll film may be tightened and the quality of the film may be significantly reduced. (2) Although it is not as expensive as the ultraviolet curing facility, a thermosetting facility such as a thermosetting chamber is required. ) Since it is allowed to stand for a certain period of time in a thermosetting chamber and hardened, it may be impossible to produce speedily. In order to solve such problems, a coating material for a low refractive index layer that can be thermally cured at a low temperature in a short time is desired. Patent Documents 1 and 2 disclose what can be cured in a short time at a relatively low temperature. However, these do not allow the drying process and the thermosetting process to be performed continuously in a heating device such as a dryer, and because they use a silicone resin having a fluorine-containing organic substituent, they are difficult in terms of cost. There is also. For this reason, it is difficult to say that this technique can efficiently produce a low-reflection optical film having excellent performance at a low cost.

JP 2002-53804 A Japanese Patent Laid-Open No. 2002-3595

  The present invention produces a low-reflection optical film excellent in performance such as anti-reflection, surface uniformity, antifouling property, chemical resistance and scratch resistance, efficiently and inexpensively by a simplified manufacturing process. The purpose of the present invention is to develop a coating material for a low refractive index layer and a low-reflective optical film using the same, and to establish a manufacturing technique.

  As a result of intensive studies to solve the above problems, the present inventors have directly or directly provided a thermosetting layer of a resin composition containing an inexpensive silicon compound not containing fluorine as a low refractive index layer on a transparent substrate film. The above-mentioned problem is solved by providing on another layer provided on the base film, in particular, a silicone oligomer containing no fluorine atom, an aminosilane coupling agent containing no fluorine atom, and The present inventors have found that a resin composition containing a silicone-grafted acrylic polymer containing no fluorine atom can be cured in a short time at a relatively low temperature.

〔式中、Ｒ_１は水素原子又はメチル基を示し、Ｒ_２は水素原子又は炭素数１〜６のアルキル基を示し、Ｒ_３は水素原子又はメチル基を示す。これらは繰り返し単位ごとに同一であっても異なっていてもよい、ｎは１〜１００００の正数、ｍは１〜３５００の正数、ｐは１〜５００の正数である〕
で表される構成単位からなるシリコーングラフトアクリルポリマーである（１）に記載の減反射性光学フィルム、
（１３）含フッ素有機置換基を有さないアルコキシシラン化合物のオリゴマーがテトラ（メトキシ又はエトキシ）シラン、メチルトリ（メトキシ又はエトキシ）シラン、フェニルトリ（メトキシ又はエトキシ）シラン、ビニルトリ（メトキシ又はエトキシ）シラン、３−グリシドキシプロピルトリ（メトキシ又はエトキシ）シラン、３−グリシドキシプロピルメチル（メトキシ又はエトキシ）シラン、３−クロロプロピルトリ（メトキシ又はエトキシ）シラン、ジメチルジ（メトキシ又はエトキシ）シラン及びジフェニルジ（メトキシ又はエトキシ）シランからなる群から選ばれる少なくとも一種の化合物のオリゴマーであり、含フッ素有機置換基を有さないアミノシランカップリング剤がＮ−（２−アミノエチル）アミノプロピルトリ（メトキシ又はエトキシ）シラン、Ｎ−（２−アミノエチル）アミノプロピルメチルジ（メトキシ又はエトキシ）シラン及び３−アミノプロピルトリ（メトキシ又はエトキシ）シランからなる群から選ばれる少なくとも一種である（１２）に記載の減反射性光学フィルム、
（１４）下記式（１）
Ｒ_aＳｉＸ_（4−a） （１）
（ａは０、１、２であり、Ｒは含フッ素有機基を有さない有機基であって、ａが２のとき２つのＲは同一でも異なっていてもよく、Ｘは加水分解性基であって、複数個あるＸは、互いに同一でも異なっていても良い）で表される化合物の加水分解及び脱水縮合により得られるオリゴマー、フッ素原子を含まないアミノシランカップリング剤、シリコーン変性したアクリル系単量体とアクリル系単量体の共重合によって得られたフッ素原子を含まないシリコーングラフトアクリルポリマーを含有する熱硬化性樹脂組成物、
に関する。That is, the present invention is (1) an oligomer of an alkoxysilane compound having no fluorine-containing organic substituent, an aminosilane coupling agent having no fluorine-containing organic substituent, and a silicone graft acrylic polymer having no fluorine-containing organic substituent. And a low-reflective optical film having a low refractive index layer obtained by curing a coating layer of a thermosetting resin composition containing a solvent on a transparent substrate film.
(2) A reduced reflection optical film in which a hard coat layer, a high refractive index layer, and the low refractive index layer according to (1) are provided in this order on a transparent substrate film,
(3) The antireflection optical film according to (2), wherein the high refractive index layer is a layer containing antimony-doped tin oxide or antimony-doped zinc oxide, or both.
(4) Contains an oligomer of an alkoxysilane compound having no fluorine-containing organic substituent, an aminosilane coupling agent having no fluorine-containing organic substituent, a silicone graft acrylic polymer having no fluorine-containing organic substituent, and a solvent. After coating the coating liquid comprising the thermosetting resin composition on the transparent substrate film or the transparent substrate film in which the hard coat layer and the high refractive index layer are provided in this order, air at 70 to 200 ° C. A method for producing a low-reflective optical film, wherein a low refractive index layer is formed by passing through a supplied hot air dryer in 0.5 to 5 minutes and continuously performing a solvent drying step and a thermosetting step. ,
(5) The near-infrared ray having a wavelength of 700 to 1100 nm is absorbed by the anti-reflection optical film according to any one of (1) to (3) or the anti-reflection optical film obtained by the production method of (4). An optical film for a plasma display panel comprising a compound and / or a layer containing a compound having a maximum absorption at a wavelength of 550 to 620 nm,
(6) The surface provided with the low refractive index layer of the anti-reflection optical film according to any one of (1) to (3) or the anti-reflection optical film obtained by the production method of (4) An optical film for a plasma display panel comprising a compound that absorbs near-infrared light having a wavelength of 700 to 1100 nm, a compound having maximum absorption at a wavelength of 550 to 620 nm, or an adhesive layer containing both on the opposite surface;
(7) An oligomer of an alkoxysilane compound having no fluorine-containing organic substituent is represented by the following formula (1)
R _a SiX _(4-a) (1)
(In the formula, a is 0, 1 or 2, R is an organic group having no fluorine-containing organic group, and when a is 2, two Rs may be the same or different, and X is hydrolyzed. A low reflection optical film according to (1), which is an oligomer of a compound represented by the following formula:
(8) The anti-reflection optical film according to (7), which is an alkoxysilane compound oligomer in which R is a C1-C10 hydrocarbon residue, and X is a C1-C4 alkoxy group,
(9) The anti-reflection optical film according to (8), wherein R is a C1-C4 alkyl group,
(10) The aminosilane coupling agent having no fluorine-containing organic substituent is an amino C1-C4 alkyl tri-C1-C3 alkoxysilane optionally having N-amino C1-C4 alkyl substitution. Anti-reflection optical film,
(11) N-amino C1-C4 alkyl tri-C1-C3 alkoxysilane optionally having N-amino C1-C4 alkyl substitution is N-amino C1-C4 alkylaminopropyltri (methoxy or ethoxy) silane or aminopropyltri ( (Methoxy or ethoxy) silane) (10)
(12) A silicone-grafted acrylic polymer having no fluorine-containing organic substituent is represented by the following formula (2)

[Wherein, R ₁ represents a hydrogen atom or a methyl group, R ₂ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and R ₃ represents a hydrogen atom or a methyl group. These may be the same or different for each repeating unit, n is a positive number from 1 to 10,000, m is a positive number from 1 to 3,500, and p is a positive number from 1 to 500.
The anti-reflection optical film according to (1), which is a silicone-grafted acrylic polymer comprising a structural unit represented by:
(13) Oligomers of alkoxysilane compounds having no fluorine-containing organic substituent are tetra (methoxy or ethoxy) silane, methyltri (methoxy or ethoxy) silane, phenyltri (methoxy or ethoxy) silane, vinyltri (methoxy or ethoxy) silane 3-glycidoxypropyltri (methoxy or ethoxy) silane, 3-glycidoxypropylmethyl (methoxy or ethoxy) silane, 3-chloropropyltri (methoxy or ethoxy) silane, dimethyldi (methoxy or ethoxy) silane and diphenyl An aminosilane coupling agent which is an oligomer of at least one compound selected from the group consisting of di (methoxy or ethoxy) silane and does not have a fluorine-containing organic substituent is N- (2-aminoethyl) aminopropyltri (me (12) which is at least one selected from the group consisting of (xy or ethoxy) silane, N- (2-aminoethyl) aminopropylmethyldi (methoxy or ethoxy) silane and 3-aminopropyltri (methoxy or ethoxy) silane The low-reflection optical film as described,
(14) The following formula (1)
R _a SiX _(4-a) (1)
(A is 0, 1, 2; R is an organic group having no fluorine-containing organic group, and when a is 2, two Rs may be the same or different, and X is a hydrolyzable group. And a plurality of Xs may be the same or different from each other) oligomers obtained by hydrolysis and dehydration condensation of compounds represented by the following formulas, aminosilane coupling agents not containing fluorine atoms, silicone-modified acrylics A thermosetting resin composition containing a silicone-grafted acrylic polymer containing no fluorine atom obtained by copolymerization of a monomer and an acrylic monomer;
About.

  The anti-reflection optical film and the optical film for PDP of the present invention can be manufactured at a low cost because the anti-reflection layer is obtained from an inexpensive material and can be cured at a relatively low temperature in a short time. In addition, it has excellent anti-reflection properties, surface uniformity, antifouling properties, chemical resistance, scratch resistance and the like. Further, the resin composition used in the present invention can be cured at a relatively low temperature and in a short time, and is optimal for the above-mentioned use.

The present invention is described in detail below.
For anti-reflection optical film,
(1) A clear type that suppresses reflection of external light and improves visible light transmittance by providing a low refractive index layer of an ultrathin film layer on the surface of the transparent substrate film,
(2) An anti-glare type in which a coating film is provided on the surface of a transparent substrate film with a resin composition containing fine particles, thereby providing irregularities on the film surface, thereby irregularly reflecting external light and suppressing the transfer of external light ,
(3) A type in which the surface of the transparent substrate film is made uneven by the method of (2) and a low refractive index layer is provided by the method of (1) to exhibit the characteristics of both methods,
There are three forms. The present invention can be applied to these methods (1) and (3), but a hard coat layer for preventing scratches and a high refractive index layer for enhancing antireflection properties are further provided on the transparent substrate film. In addition, it is possible to take an aspect in which a low-reflective optical film with better performance is obtained by providing a low refractive index layer thereon.
That is, the low refractive index layer in the present invention only needs to be on the transparent substrate film, and does not need to be in direct contact with the transparent substrate film, but the hard coat layer and / or the anti-reflection property on the substrate film. It may be provided on another layer such as a high refractive index layer for increasing the thickness.

  The transparent base film used in the reduced reflection optical film of the present invention can be used as long as it has elasticity and high transparency, but as a specific example of the transparent base film that can be used, Polyester resins such as polyethylene terephthalate (hereinafter referred to as PET) or polyethylene naphthalate; Polyolefin resins such as cyclic polyethylene naphthalate, cyclic polyolefin, polyethylene, polypropylene or polystyrene; Vinyl resins such as polyvinyl chloride or polychlorinated biphenyl A polycarbonate film; an acrylic resin; a triacetyl cellulose; a polyether sulfone; a polyether ketone; or a transparent film such as a norbornene resin. However, it is not limited to these. The haze value relating to transparency is preferably 5% or less, and more preferably a film having high transparency of 1% or less. A PET film is more preferable in view of various physical properties such as elasticity and heat resistance, handleability, and availability. The surface of the transparent substrate film can be easily subjected to corona discharge treatment, plasma treatment, glow discharge treatment, surface roughening treatment, chemical treatment, treatment with an anchor coating agent or primer, etc. in order to improve adhesion to the coating agent. Adhesion treatment may be performed. Moreover, the film which hold | maintained ultraviolet-ray shielding property may be sufficient. The thickness of the transparent substrate film is 10 to 400 μm, more preferably 20 to 250 μm. The base film is preferably a film that can be wound into a roll, and is preferably a transparent film that is highly uniform in thickness, free of fish eyes and foreign matter, and managed to withstand use as a base for optical films. . Such transparent substrate films are “Cosmo Shine” series (trade name, manufactured by Toyobo Co., Ltd.), “Lumilla” series (trade name, manufactured by Toray Industries, Inc.), “Diafoil” series. (Trade name, manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.) and the like.

Next, the resin composition of the present invention (hereinafter simply referred to as a resin composition) will be described.
The resin composition is an oligomer of an alkoxysilane compound having no fluorine-containing organic substituent (a fluorine-containing organic group in which a hydrolyzable group such as an alkoxy group of an alkoxysilane compound is hydrolyzed and then oligomerized by dehydration polycondensation) An alkoxysilane polycondensation compound having no fluorine; hereinafter also referred to as the present alkoxysilane polycondensation compound), an aminosilane coupling agent having no fluorine-containing organic group (also referred to as F-free aminosilane coupling agent), and a fluorine-containing organic group Is a composition obtained by uniformly dissolving or dispersing a silicone-grafted acrylic polymer (also referred to as F-free silicone-grafted acrylic polymer) in a solvent together with other additives as necessary, Composed of inexpensive compounds and relatively low in parallel with drying in heating equipment such as dryers In Can thermosetting, it is characterized to be able to easily form the low-refractive index resin coating layer.

The alkoxysilane compound for obtaining the alkoxysilane polycondensation compound is represented by the following formula (1):
R _a SiX _(4-a) (1)
(Wherein a is 0, 1, 2; R is an organic group having no fluorine-containing organic group, and when a is 2, two Rs may be the same or different; And a plurality of Xs may be the same or different from each other). The organic group having no fluorine-containing organic group of R is not particularly limited as long as it is an organic group not containing X and not containing a fluorine atom. Usually, R can include a hydrocarbon residue having about 1 to 10 carbon atoms which may have a functional substituent, and more preferably has a functional substituent such as an epoxy group or a vinyl group. Can be mentioned hydrocarbon residues having about 1 to 6 carbon atoms. Examples of the functional substituent include a chloro atom, a hydroxy group, an epoxy group, a glycidyl group, or a C1-C4 lower alkoxy group substituted with these groups. Preferred functional substituents include chloro atoms or glycidyl groups, with glycidyl groups being more preferred. Specific examples of preferred R include hydrocarbon residues having about 1 to 6 carbon atoms such as methyl, ethyl, propyl, butyl, pentyl, hexyl, vinyl, phenyl, glycidoxypropyl and the like. More preferable R includes a C1-C4 alkyl group, a vinyl group, a phenyl group, a glycidoxy-substituted C1-C4 alkyl group, and the like. More preferred R is a C1-C4 alkyl group.
Examples of X include a chloro atom, a bromine atom, an alkoxy group, and the like, preferably a C1-C4 alkoxy group, and most preferably a methoxy group.
Specific examples of such compounds include tetramethoxysilane, methyltrimethoxysilane, phenyltrimethoxysilane, vinyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3 -Chloropropyltrimethoxysilane, dimethyldimethoxysilane, diphenyldimethoxysilane, and those in which the alkoxy group of these silanes is an ethoxy group. However, it is not limited to these.
In order to synthesize oligomers from these alkoxysilane compounds, these compounds can be obtained by performing hydrolysis polycondensation (more preferably acid hydrolysis polycondensation) by a conventional method. The raw silane compounds may be used alone or in combination of two or more. In the hydrolysis polycondensation, hydrolyzable groups (preferably alkoxy groups) of these alkoxysilane compounds are hydrolyzed and then oligomerized by dehydration condensation to become alkoxysilane polycondensation compounds. The hydrolysis may be acid hydrolysis or alkali hydrolysis, but acid hydrolysis is preferred. In some cases, a low molecular weight oligomer (for example, a condensate of tetramethoxysilane such as methyl silicate 51) is used as a raw material to perform polycondensation to obtain a higher molecular weight oligomer. In the present invention, a compound obtained by polycondensation of a low molecular weight oligomer is also included in the alkoxysilane polycondensation compound. The desired alkoxysilane polycondensation compound can be obtained by appropriately selecting the type of alkoxysilane compound and the degree of dehydration condensation. By using it, the resin composition which hardens | cures on desired conditions can be obtained, and it can use suitably for a thermosetting low refractive index layer. The degree of polymerization of the alkoxysilane polycondensation compound (oligomer) is in the range of about 2 to 100, usually about 2 to 50, more preferably about 3 to 30, and in some cases about 4 to 20 or about 2 to 10. In the present invention, those having these polymerization degrees are called oligomers for convenience. These alkoxysilane polycondensation compounds are obtained by hydrolysis, for example, hydrolysis with an acid such as hydrochloric acid, and polycondensation in the presence of a catalyst such as a tin-based catalyst, if necessary. Can do. Further, for example, Solgar NP-730 (trade name, manufactured by Nippon Dacro Shamrock Co., Ltd.), Tosguard 510 (trade name, manufactured by Toshiba Silicone Co., Ltd.) or KP-64 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) It can also be easily obtained from the market. Among these commercially available products, the tossard 510 is one of the more preferable ones.
Preferred examples of the alkoxysilane polycondensation compound include compounds obtained by hydrolysis polycondensation of alkoxysilane compounds described below.
Examples of the alkoxysilane compound include tetra (methoxy or ethoxy) silane, methyltri (methoxy or ethoxy) silane, phenyltri (methoxy or ethoxy) silane, vinyltri (methoxy or ethoxy) silane, 3-glycidoxypropyltri (methoxy or Ethoxy) silane, 3-glycidoxypropylmethyl (methoxy or ethoxy) silane, 3-chloropropyltri (methoxy or ethoxy) silane, dimethyldi (methoxy or ethoxy) silane and diphenyldi (methoxy or ethoxy) silane At least one selected alkoxysilane compound, more preferably tetramethoxysilane, tetraethoxysilane, methyltrimethoxysilane, dimethyldimethoxysilane, phenyltrimethoxysilane and di- One or two or more selected from the group consisting of E sulfonyl dimethoxysilane (preferably two) can be exemplified alkoxysilane compounds.
More preferable alkoxysilane polycondensation compounds are compounds (oligomers) obtained by hydrolysis polycondensation of at least one compound selected from the group consisting of tetramethoxysilane, methyltrimethoxysilane and dimethyldimethoxysilane. In some cases, the more preferred polycondensation compound is an alkoxysilane polycondensation compound (poly C1-C4 alkylsiloxane) obtained by hydrolysis polycondensation of diC1-C4 alkyldimethoxysilane such as dimethyldimethoxysilane. The alkoxysilane polycondensation compound may be used alone or in combination of two or more as required. For example, the polycondensation compound of phenyltrimethoxysilane or diphenyldimethoxysilane can be used in combination with the above-mentioned preferable alkoxysilane polycondensation compound. The terminal of the polycondensation compound may be a hydroxy group or an alkoxy group. Usually a hydroxy group.

The F-free aminosilane coupling agent has a function of accelerating curing and giving the low refractive index layer scratch resistance and adhesion by improving surface hardness. The aminosilane coupling agent is not particularly limited as long as it is a silane coupling agent having an amino group. Typical examples include amino C1-C5 alkyl tri-C1-C3 alkoxy silane, amino C1-C5 alkyl C1-C3 alkyl di-C1-C3 alkoxy silane, N- (amino C1-C3 alkyl) -3-aminoalkyl tri-C1- C3 alkoxysilane or N- (amino C1-C3 alkyl) -3-aminoalkyl C1-C3 alkyldiC1-C3 alkoxysilane may be mentioned. More specifically, for example, N- (2-aminoethyl) aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltriethoxysilane, N- (2-aminoethyl) aminopropylmethyl Dimethoxysilane, N- (2-aminoethyl) aminopropylmethyldiethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, and partial hydrolysates or polymers of these compounds can be used. These are used alone or in combination of two or more. These coupling agents can also be obtained from the market as TSL8300 series (trade name, manufactured by Toshiba Silicone Co., Ltd.), KBM series and KBE series (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.).
Preferable examples include amino C1-C5 alkyl tri-C1-C3 alkoxysilane, and 3-aminopropyltrimethoxysilane is more preferable.

  In addition, F-free silicone graft acrylic polymer is a polymer alloy of silicone resin and acrylic resin, so it has the properties of both resins. It has a function of imparting sex. Furthermore, this polymer is excellent in the action of promoting the curing of the resin composition at a relatively low temperature when used together with the alkoxysilane polycondensation compound and the aminosilane coupling agent. This polymer can be used without particular limitation as long as it is a polymer in which a side chain mainly composed of dimethylsiloxane is grafted to a main chain composed of an acrylic polymer. For example, as shown in the following formula (2), acrylic Those obtained by copolymerizing a structural unit derived from a monomer (n = repeating unit) and a silicone-modified acrylic monomer (m = repeating unit) are preferably used.

[In Formula (2), R ₁ represents a hydrogen atom or a methyl group, R ₂ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and R ₃ represents a hydrogen atom or a methyl group. These may be the same or different for each repeating unit. n is a positive number of 1 to 10,000, m is a positive number of 1 to 3500, and p is a positive number of 1 to 500. ]
Further, as disclosed in JP-A-7-97770, the copolymer can be obtained by radical copolymerization of a silicone-modified acrylic monomer and an acrylic monomer by a conventional method. The acrylic monomers used for the synthesis of the graft polymer include acrylic acid and methacrylic acid, and their C1-C6 alkyl esters, preferably C1-C4 alkyl esters, more preferably methyl and ethyl esters. There may be mentioned at least one selected from the group, preferably one or a combination of two to three.
Examples of silicone-modified acrylic monomers include silicone-modified (meth) acrylic acid C1-C6 alkyl esters. More specifically, it is silicone-modified acrylic acid C1-C6 alkyl ester or silicone-modified methacrylic acid C1-C6 alkyl ester. Preferable examples include silicone-modified (meth) acrylic acid propyl ester. The silicone-modified acrylic acid C1-C6 alkyl ester is
_{CH 2 = C (R 3)} COOR 4 -Si (R 5) 3-Q Cl Q
(In the formula, R ₃ represents a hydrogen atom or a methyl group, R ₄ represents a C1-C6 alkylene group, R ₅ represents a methyl group or a methoxy group, Cl represents a chloro atom, and Q represents an integer of 1 to 3, preferably 1. ) And a dimethylsiloxane compound having a hydroxy group at one end (a C1-C4 alkyl group such as a methyl group, preferably a methyl group is preferred at the opposite end of the hydroxy group). It can be obtained by dehydrochlorination reaction by the method. Using a silicone-modified (meth) acrylic acid propyl ester obtained by reacting the dimethylsiloxane compound with a (meth) acrylate-substituted chlorosilane compound in which R ₄ is a propylene group and Q is 1, When copolymerized with a monomer, a silicone-grafted acrylic polymer having a structural unit represented by the above formula (2) can be obtained.

In the above formula (2), R ₁ is a methyl group, or optionally a hydrogen atom and a methyl group (for example, both (acrylic) and methacrylic acid or C1-C2 alkyl esters thereof are used as (meth) acrylic monomers. Case), and R ₂ is preferably a hydrogen atom, a methyl group or an ethyl group. And n is preferably 1 to 5000, particularly preferably 1 to 2500, m is about 1 to 2000, 10 to 2000 is preferable, particularly preferably 1 to 1000, and p is about 5 to 300. Yes, 10 to 300 are preferable. In some cases, about 6 to 100 is preferable. In addition, the repeating numbers n and m represent the total number of segments of each component in the silicone graft acrylic polymer, and do not necessarily indicate the number of continuous monomers.
The preferred number average molecular weight of the polymer is about 1000 to 100,000.
The silicone content in the silicone-grafted acrylic polymer is in the range of 5 to 90% by weight (hereinafter, unless otherwise specified,% represents% by weight), preferably in the range of 10 to 90%, 10 to 60%, Most preferably, it is 20 to 50%. Moreover, 5 to 60% is preferable depending on the case, More preferably, it is 5 to 50%.
The silicone graft acrylic polymer can be obtained from the market as, for example, Cymac US-270, US-380 (trade name, manufactured by Toagosei Co., Ltd.), X-22-8000 series (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), etc. .

None of the above-described components used in the present invention has a fluorine-containing organic group, and since the coating material for the low refractive index layer is composed of such a compound, a resin having a fluorine-containing organic group is used. It is less expensive than the resin composition used, and has good adhesion, scratch resistance, antifouling property, chemical resistance, etc., and also due to the phenomenon of puncturing the coating film (hereinafter referred to as “repellency”). Low refractive index resin coating that can be cured in a short time at a relatively low temperature with few reflection defects (reflective dotted surface defects) (a phenomenon in which the coating film is repelled and dot-like holes are formed) can do.
The composition ratio of each component is 5 to 40 parts, preferably 10 to 10 parts by weight of the aminosilane coupling agent with respect to 100 parts by weight of the alkoxysilane polycondensation compound (unless otherwise indicated, parts are parts by weight). 30 parts, silicone graft acrylic polymer is 0.5-10 parts, more preferably 1-5 parts. In some cases, the aminosilane coupling agent may be 3 to 40 parts, more preferably 5 to 30 parts, and the silicone graft acrylic polymer may be about 2 to 8 parts with respect to 100 parts of the alkoxysilane polycondensation compound. Each of these components is contained in a total amount of 0.5 to 20% by weight (hereinafter,% indicates% by weight unless otherwise specified), more preferably 1 to 10%, based on the entire resin composition including the solvent. . In some cases, the total amount of each component may be 1 to 30%, preferably about 5 to 15%, based on the entire resin composition including the solvent. The balance is a solvent other than the above components and additives that are added as necessary.
A resin composition for a low refractive index layer can be prepared by uniformly dissolving and / or dispersing each of the above components in a solvent. The method of dissolution and / or dispersion is not particularly limited, but may be gelled. Therefore, it is preferable to mix each of the above components in a solution dissolved in a solvent. For example, a solution in which the alkoxysilane polycondensation compound is dissolved in the following solvent in advance and a solution in which the silicone graft acrylic polymer is dissolved in the solvent are uniformly mixed, and the resulting mixture and the aminosilane coupling agent are dissolved in the following solvent. It is preferable that the whole is not gelled by a method such as mixing with the prepared solution.
When the resin composition thus obtained is applied such that the film thickness after curing is 1 μm or less, for example, about 0.01 to 1 μm, more preferably about 0.05 to 0.5 μm, Relatively low temperature, for example, about 80 to 200 ° C, preferably about 90 to 170 ° C, more preferably about 95 to 160 ° C, for a short time, for example, 0.5 to 10 minutes, preferably 0.5 to 5 minutes, Preferably, the resin composition can be cured in 1 to 5 minutes, more preferably in about 1 to 4 minutes, and can be cured at a relatively low temperature for a short time.

  In preparing the resin composition of the present invention, any solvent that can be used can be used as long as it has high solubility in the above-mentioned components. Usually, the solvent may be appropriately selected in consideration of the uniformity of the coating layer, easiness of drying, flammability, toxicity, availability, and the like. Specific examples of the solvent include, for example, dioxane, tetrahydrofuran, 1,2-dimethoxymethane, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, triethylene glycol dimethyl ether, triethylene. Ethers such as glycol diethyl ether, tetraethylene glycol dimethyl ether or tetraethylene glycol diethyl ether; carbonates such as ethylene carbonate or propylene carbonate; ketones such as methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone or acetophenone; phenol, cresol or xylenol Fe Ethols such as ethyl acetate, butyl acetate, ethyl cellosolve acetate, butyl cellosolve acetate, carbitol acetate, butyl carbitol acetate or propylene glycol monomethyl ether acetate; hydrocarbons such as toluene, xylene, diethylbenzene or cyclohexane; trichloroethane; Halogenated hydrocarbons such as tetrachloroethane or monochlorobenzene; alcohols such as methyl alcohol, ethyl alcohol, isopropyl alcohol, n-butyl alcohol, 2-butyl alcohol or n-hexyl alcohol; petroleum systems such as petroleum ether or petroleum naphtha Although organic solvents, such as a solvent, can be mentioned, it is not limited to these. These solvents may be used alone or in combination of two or more.

  In preparing the resin composition, additives such as a viscosity modifier, an antifoaming agent and / or a leveling agent (surfactant, etc.) may be added as desired.

  The resin composition for the thermosetting low refractive index layer used in the present invention may be used as it is, or diluted with the solvent so as to have an appropriate viscosity according to the coating method described below. You can also The viscosity of the coating agent is usually preferably 1 mPa · S (millipascal · second) or less.

When the low refractive index layer coating is applied directly on the transparent substrate film to provide the low refractive index layer, the following steps are performed.
What is necessary is just to apply | coat the coating agent for low refractive index layers to a transparent base film using a normal coater. As the coater, for example, a curtain flow coater, a micro gravure coater, a roll coater, a spin coater, a lip coater, a blade coater, a bar coater, a reverse coater or a die coater can be used. The thickness of the low refractive index layer is preferably 1/4 of the wavelength of visible light whose reflection should be reduced. Usually, the thickness after curing is about 0.01 to 1 μm, preferably 0.05 to 0. It is preferable to apply so that the thickness is about 0.5 μm, about 0.05 to 0.3 μm, and most preferably about 0.1 μm. In the present invention, since the coating film is cured at a relatively low temperature in a short time, the coating film drying process and the thermosetting process can be performed continuously in a hot air dryer. Therefore, in the present invention, it is used for a low refractive index layer by allowing the inside of a heating device to be supplied with normal optical film drying conditions, for example, air having a temperature of 70 to 200 ° C., for 0.5 to 5 minutes. The coating film of the coating is dried at the same time as it is dried. The refractive index of the obtained low refractive index layer is preferably 1.5 or less, more preferably 1.35 to 1.49.

  Further, the anti-reflection optical film of the present invention is one in which at least one other layer is provided on the transparent substrate film, even if the low refractive index layer is directly provided. Also good. Examples of the other layer include a hard coat layer for complementing the ease of scratching of the transparent substrate film and / or a high refractive index layer for enhancing the low reflection property. When both a hard coat layer and a high refractive index layer are provided, a hard coat layer is provided on the base film, then a high refractive index layer is provided thereon, and further the low refractive index layer is provided thereon. Thus, the reduced reflection optical film of the present invention can be obtained. These layers contain fine particles such as silica for imparting antiglare properties, and further, the high-refractive index layer and the low-refractive index layer are alternately and repeatedly laminated to widen the wavelength range of dereflection. Aspects can also be employed. When the coating agent for a low refractive index layer is applied on a transparent substrate film provided with a hard coat layer and / or a high refractive index layer, it can be carried out in the same manner as described above using the coater.

  The hard coat layer coating is not particularly limited as long as it has a high hardness and can form a transparent layer having excellent scratch resistance. Usually, the coating agent is a thermosetting monomer and an active energy ray-curable monomer that can be cured by active energy rays such as ultraviolet rays (hereinafter, both are also simply referred to as a curable monomer), a polymerization initiator. In addition, a solution obtained by dissolving and / or dispersing other additives such as a dispersant, which is added as necessary, in a solvent is used.

  Here, as the thermosetting monomer and the active energy ray curable monomer, a polyfunctional monomer having two or more polymerizable unsaturated groups, for example, dipentaerythritol hexa (meth) acrylate, di Pentaerythritol penta (meth) acrylate, dipentaerythritol tetra (meth) acrylate, pentaerythritol tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol di (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, Ditrimethylolpropane di (meth) acrylate, ditrimethylolpropane tri (meth) acrylate, trimethylolpropane di (meth) acrylate, tetramethylolmethane tetraacrylate, 1,1,1-tris (a Liloyloxyethoxyethoxycyclohexyl) propane, 2,2-bis (4-acryloyloxyethoxyethoxyphenyl) propane, 2,2-bis (4-acryloyloxyethoxyethoxyphenyl) methane, neopentyl glycol di (meth) Acrylate, hydrogenated dicyclopentadienyl di (meth) acrylate, tris (hydroxyethyl) isocyanurate triacrylate, tris (hydroxyethyl) isocyanurate diacrylate, 1,4-butanediol di (meth) acrylate, 1,6 -Hexanediol di (meth) acrylate, isobornyl di (meth) acrylate or polyalkylene glycol di (meth) acrylate (eg, polyethylene glycol di (meth) acrylate, polypropylene glycol) Ruji (meth) acrylate or 2 to 4 functional (meth) acrylates of polytetramethylene glycol di (meth) acrylate) and the like are used, it may be used in combination alone or in combination.

Examples of the polymerization initiator include azo radical polymerization initiators such as azobisisobutyronitrile, azobiscyclohexanecarbonitrile, and azobisvaleronitrile, benzoyl peroxide, tert-butyl hydroperoxide, cumene parper. Organic peroxide radical polymerization initiators such as oxide or diacyl peroxide, benzoin compounds such as benzoin, benzoin methyl ether, benzoin ethyl ether or benzoin isopropyl ether, carbonyl compounds such as benzyl, benzophenone, acetophenone or Michler's ketone, azo Photopolymerization initiators such as azo compounds such as bisisobutyronitrile or azodibenzoyl, or a mixture of an α-diketone and a tertiary amine can be used.
Furthermore, as an additive, a leveling agent known per se, an antifoaming agent and the like are appropriately added.
Furthermore, as the solvent, the solvents described in the coating agent for the low refractive index layer can be used, and may be appropriately selected in consideration of solubility, easiness of drying, safety and the like.

The hard coat layer coating agent is prepared by uniformly dissolving and / or dispersing the above-mentioned curable monomer, polymerization initiator, dispersing agent and other additives in a solvent so that the concentration becomes easy to apply as required. It can be obtained by adjusting. Generally, the total content of the curable monomer and the polymerization initiator is adjusted to 20 to 80% by weight, more preferably 30 to 70% by weight in the hard coat layer coating. The balance is solvent and other additives. The polymerization initiator is preferably used in an amount of 0.01 to 10 parts by weight per 100 parts by weight of the curable monomer.
Such a hard coat layer coating agent in which a curable monomer, a polymerization initiator, a dispersant and the like are prepared in a solvent is a hard rock OP / UV series (trade name, manufactured by Denki Kagaku Kogyo Co., Ltd.), KAYANOVA. It can also be obtained from the market as POP series (trade name, manufactured by Nippon Kayaku Co., Ltd.), Reicure OP series (trade name, manufactured by Jujo Chemical Co., Ltd.), and the like.

Further, by adding inorganic fine particles such as silicon oxide, aluminum oxide, tin oxide, and titanium oxide to the hard coat layer coating agent, a higher surface hardness can be obtained, and the refractive index can be adjusted and the resin can be used. Shrinkage due to curing can be alleviated. In addition, a dispersant, a leveling agent for coating, or other additives can be added to the coating agent. The film thickness of the hard coat layer is preferably 1 to 15 μm, and if it is 1 μm or less, sufficient surface hardness cannot be obtained, and if it exceeds 15 μm, curling of the transparent substrate film increases and cracks are likely to occur. Absent.
In addition, in the case of a reduced reflection optical film with antiglare property, it is preferable to contain fine particles in any one of a hard coat layer, a low refractive index layer and a high refractive index layer in order to diffusely reflect the reflected light. The hard coat layer having a relatively large layer thickness is advantageously contained. The fine particles may be inorganic compounds or organic compounds such as silica, melamine, and acryl, and have an average particle diameter of 0.5 to 10 μm, more preferably 1 to 5 μm.

  The hard coat layer coating can be applied directly to the transparent base film using, for example, a coater, and a film with a hard coat layer can be obtained through a drying step and a curing step. As the coater, for example, a curtain flow coater, a micro gravure coater, a roll coater, a lip coater, a spin coater, a blade coater, a bar coater, a reverse coater, a die coater, etc. can be used, and it is appropriately selected depending on the desired film thickness and surface condition. be able to. The drying process and the curing process of the coating film can be performed by conventional methods. The pencil hardness of the film surface is preferably H or higher, more preferably 2H or higher, and 3H or higher may be required depending on the application. Selection of a curable monomer, selection of film thickness, addition of inorganic fine particles, A hard coat layer having a desired surface hardness can be provided by a treatment such as nitrogen purge during curing. By providing the low refractive index layer on this, a low reflection optical film with a hard coat layer can be obtained.

  A resin layer having a high refractive index can be formed as a lower layer of the low refractive index layer as necessary for the purpose of further increasing the antireflection property. For this purpose, the coating material for the high refractive index layer includes, for example, a thermosetting monomer, an active energy ray curable monomer, a polymerization initiator, and a metal oxide that provides high refractive index properties. The product can be obtained by dissolving and / or dispersing in the solvent together with other additives added as necessary. Examples of metal oxides that provide high refractive index include titanium oxide, zirconium oxide, zinc oxide, tin oxide, iron oxide, indium tin oxide, antimony-doped tin oxide, antimony-doped zinc oxide, and aluminum-doped zinc oxide. Antimony-doped tin oxide and antimony-doped zinc oxide are more preferred from the standpoints of ease of coating, imparting electrical conductivity (antistatic properties) and cost. The refractive index of the high refractive index layer is preferably 1.55 or more. The film thickness is preferably set so that the wavelength indicating the maximum reflectance of the film provided with the high refractive index layer is 400 to 900 nm, and is usually in the range of 0.1 to 0.3 μm. It is preferable to set.

Such a high refractive index layer is preferably provided on the hard coat layer, and a common coater similar to the coating of the hard coat layer may be used for coating, for example, curtain flow coater, microgravure A film coater, a roll coater, a curtain flow coater, a lip coater, a spin coater, a blade coater, a bar coater, a reverse coater, a die coater and the like can be appropriately selected in consideration of a desired film thickness and surface condition. After coating, a film having a high refractive index layer can be obtained through a drying step and a curing step, and an excellent anti-reflection optical film can be obtained by providing the low refractive index layer thereon.
As is apparent from the above description, the hard coat layer is first provided on the transparent base film, then the high refractive index layer is provided, and finally the low refractive index layer is provided. An anti-reflection optical film is the most preferred embodiment of the present invention.

  PDP applies the voltage to a rare gas (neon, xenon, etc.) enclosed in a cell sandwiched between two plate-like glasses, and the necessary visible light is applied to the luminous body treated on the cell wall surface. Light is generated and the image is displayed on the display. Therefore, in the PDP, the purity of red light due to near infrared rays (hereinafter also referred to as NIR in some cases) having a wavelength of 700 to 1100 nm, which causes malfunction of peripheral home appliances simultaneously with visible light, electromagnetic waves that are harmful to the human body, and neon gas. Since harmful electromagnetic waves such as orange light (hereinafter referred to as neon light, and sometimes also referred to as NE) in the vicinity of a wavelength of 595 nm, which emits light, are emitted together, they transmit useful visible light, but these harmful electromagnetic waves Need to be shielded. Therefore, an optical filter for this purpose is required on the front surface of the PDP module. For this reason, when the reduced reflection optical film is used as an optical film for PDP, it is usual to use a film for shielding these electromagnetic waves on the reduced reflection optical film. The reduced reflection optical film of the present invention can be optimally used for such applications, and can be made into a composite optical film for PDP which is excellent in reduced reflection property, near infrared absorption property and neon light absorption property. For example, a transparent body that shields electromagnetic waves that are harmful to the human body (hereinafter referred to as an electromagnetic wave shielding transparent body) is bonded with the anti-reflection optical film, and a layer having other functions is provided as necessary. It can be used as an optical filter for PDP having a low reflection property.

The electromagnetic shielding transparent body has a mesh type in which ultrafine wires made of metal such as copper do not affect visibility and are held in a transparent body such as a transparent film, and visible light transmission. There is a thin film type in which the ultrathin film of the metal is held in a transparent body within a range having the property. Since the thin film type electromagnetic wave shielding transparent body normally reflects near infrared rays and does not transmit it to the viewer side, when it is used for the optical filter, a layer having neon light shielding properties is used. It can be used as an optical filter for the PDP by combining the transparent body or the anti-reflection optical film and combining them, but when a mesh type electromagnetic wave shielding transparent body is used for the optical filter, the electromagnetic wave shielding In the layer provided in at least one of the transparent body or the reduced reflection optical film, it is necessary to have a near infrared shielding property and a neon light shielding property. Usually, a compound that absorbs near infrared light having a wavelength of 700 to 1100 nm (also referred to as a near infrared light absorbing compound) is used for shielding near infrared rays, and a compound that has a maximum absorption at a wavelength of 550 to 620 nm for shielding neon light (neon light absorbing). Also referred to as a compound). Although it does not specifically limit as this layer which has this shielding property, As a preferable one aspect | mode, the binder provided between the adhesion layer for bonding together this electromagnetic wave shielding transparent body and the said low reflection optical film, and a low reflection film You can list the layers. In that case, using a coating material containing each of the above compounds and a binder resin, a binder layer is provided on the transparent substrate film surface opposite to the anti-reflection surface of the anti-reflection film, and an adhesive layer is further formed thereon. By providing, it can be set as the low reflection optical film (optical film for plasma displays) of this invention which has a composite function.
Further, in the present invention, a compound that absorbs the above-described wavelength is contained under the low refractive index layer of the low reflection optical film, that is, the hard coat layer or the high refractive index layer, or the transparent side opposite to the low reflection surface is included. By newly providing a layer such as a coating film containing the compound on the base film surface or by providing the compound in the adhesive layer when providing an adhesive layer on the opposite side of the anti-reflection surface, etc. It can be set as the low reflection optical film (optical film for plasma displays) of this invention which has a composite function.

As the near-infrared absorbing compound, any compound can be used as long as it can efficiently absorb near-infrared light having a wavelength of 700 to 1100 nm and has a good visible light transmittance. For example, phthalocyanine-based, thiol metal complex-based, azo Known near-infrared absorbing compounds such as compounds, polymethine-based, diphenylmethane-based, triphenylmethane-based, quinone-based or diimonium salt-based dyes can be used. These can be used alone or in combination of two or more. Any neon light absorbing compound can be used as long as it can efficiently absorb neon light and has other visible light transmittance, such as cyanine, azaporphyrin, squarylium, azomethine, xanthene. Known neon light-absorbing compounds such as oxonol, oxonol and azo compounds can be used. These can be used alone or in combination of two or more. In the present invention, when these compounds are contained in a layer such as a hard coat layer, in the case of PDP using a mesh type electromagnetic wave shielding transparent body, a near-infrared absorbing compound and a neon light absorbing compound are mixed in a coating material. On the other hand, in the case of a PDP using a thin-film type electromagnetic wave shielding transparent body, only a neon light absorbing compound is mixed with a coating material to form a coating material containing each, and the coating layer is used as a target layer. May be formed.
In addition, when forming a binder layer containing a compound that absorbs light of each of these wavelengths as described above (hereinafter also simply referred to as an absorbing compound), the binder resin material is color adjusted as necessary. It is preferable that the absorbing compound is dissolved and / or dispersed in a solvent together with additives such as a dye and a stabilizer to form a coating agent. In particular, since these absorbing compounds may deteriorate over time in the binder layer, it is preferable to give sufficient consideration to the selection of durable compounds and the assembly of formulations. Examples of the binder resin that can be used include materials such as polyester resins, acrylic resins, polyamide resins, polyurethane resins, polyolefin resins, and polycarbonate resins, with solvents and coating conditions suitable for each material. As with the hard coat layer, coating may be performed using a normal coater.
In the optical film or optical filter having a layer having near-infrared absorbability and neon light absorbency obtained as described above, the transmittance of near-infrared light having a wavelength of 700 to 1100 nm is 20% or less, more preferably 10%. In the following, it is preferable to set the amount of each absorbing compound and / or the coating conditions so that the neon light transmittance, for example, the light transmittance in the vicinity of a wavelength of 590 nm is 50% or less, more preferably 40% or less.

  Since the anti-reflection optical film of the present invention is usually used by being bonded to a planar body of a target device, it is convenient to provide an adhesive layer on the film. One of the most preferable embodiments of the optical film for PDP of the present invention is one in which the adhesive layer contains the above-mentioned near-infrared absorbing compound and / or neon light-absorbing compound, and the transmittance of near-infrared light having a wavelength of 700 to 1100 nm is 20 It is preferable to contain each absorbing compound so that the neon light transmittance, for example, the transmittance of light in the vicinity of a wavelength of 590 nm, is 50% or less, more preferably 40% or less.

The adhesive layer is preferably highly transparent, and examples of the adhesive component that can be used for the adhesive layer include acrylic resin adhesives, rubber adhesives, and silicone resin adhesives. The adhesive component constituting the adhesive layer has a high molecular weight (degree of polymerization) in order to maintain adhesion, that is, the weight average molecular weight Mw of the main polymer is preferably about 600,000 to 2,000,000, more preferably 800,000 to 180. It is about ten thousand.
Among these, an acrylic resin adhesive is preferable in that it is excellent in transparency, adhesiveness, heat resistance, ease of handling, price, and the like. This pressure-sensitive adhesive is usually an acrylic acid alkyl ester as a main component, a polar monomer copolymerized therewith to form a copolymer, and further crosslinked with a crosslinking agent. This adhesive material has excellent adhesive strength and cohesive strength, and since it has no unsaturated bond in the polymer, it is highly stable against light and oxygen. In addition, the type and molecular weight of the monomer used to obtain the copolymer can be selected. It is excellent in that the degree of freedom is high. The proportion of the polar monomer component in the copolymer is preferably 0.1 to 20 parts by weight, more preferably 0.5 to 15 parts by weight, and still more preferably per 100 parts by weight of the acrylic acid alkyl ester component. Is 1 to 10 parts by weight.

Specific examples of the main component acrylic acid alkyl ester include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, pentyl (meth) acrylate, ( Hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, nonyl (meth) acrylate, decyl (meth) acrylate, undecyl (meth) acrylate or dodecyl (meth) acrylate, Examples include acrylic acid alkyl esters or methacrylic acid alkyl esters (the alkyl group in the alkyl ester preferably has about 1 to 12 carbon atoms). However, it is not limited to these. These are used alone or in combination of two or more.
In this specification, for example, “methyl (meth) acrylate” or the like is used to mean “methyl acrylate or / and methyl methacrylate” or the like, and the same “(meth) acryl” or “(meta) In terms including expressions such as “) acrylate”, the same meaning is used.

  As the polar monomer, those functioning as a crosslinking point with the crosslinking agent described below are used, and those having a hydroxyl group or a carboxyl group as the polar group are preferable, for example, containing a carboxyl group such as acrylic acid or methacrylic acid Monomer, (meth) acrylic acid 2-hydroxylethyl or (meth) acrylic acid 2-hydroxylpropyl-containing (meth) acrylic acid ester monomer, N, N-dimethylaminoethyl acrylate, N- Acrylic polar monomers such as amino group-containing (meth) acrylic acid ester monomers such as t-butylaminoethyl acrylate, or maleic acid can be used. However, these are not limited. These are used alone or in combination of two or more.

Specific examples of the crosslinking agent that can be used include polyisocyanate compounds (for example, aliphatic diisocyanates such as hexamethylene diisocyanate or a trimethylolpropane adduct of hexamethylene diisocyanate, or aromatics such as a trimethylolpropane adduct of tolylene diisocyanate). Diamine compounds such as hexamethylenediamine or triethyldiamine; epoxy compounds (for example, epoxy resins such as bisphenol A or epichlorohydrin, or epoxy resin compounds such as polyethylene glycol diglycidyl ether); urea resin compounds; metal salts ( Examples thereof include aluminum chloride, ferric chloride, aluminum sulfate, and copper sulfate. However, it is not limited to these. These crosslinking agents are used alone or in combination of two or more.
These crosslinking agents are generally used in an amount of 0.001 to 10 parts by weight, preferably 0.005 to 5 parts by weight, more preferably 0.01 to 3 parts by weight per 100 parts by weight of the acrylic resin adhesive. .

  The above-mentioned adhesive component is dissolved and / or dispersed in a solvent together with other additives added as necessary, and used as an adhesive layer coating. Examples of solvents that can be used include acetone, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, propyl acetate, methanol, ethanol, isopropyl alcohol, ethyl cellosolve, butyl cellosolve, benzene, toluene, xylene, tetrahydrofuran, n-hexane, and n-heptane. , Methylene chloride, chloroform, N, N-dimethylformamide and the like. However, it is not limited to these. These are used alone or in combination of two or more. Examples of other additives used as necessary include the above-mentioned near infrared absorbing compound, neon light absorbing compound, ultraviolet absorber and / or color adjusting dye.

  In the reduced reflection optical film of the present invention having an adhesive layer, the adhesive layer coating is applied to an ordinary bar coater or reverse coater so that the thickness of the adhesive layer after drying is 5 to 100 μm, preferably 10 to 50 μm. Using a coating machine such as a comma coater, gravure coater, die coater, lip coater, etc., usually directly on the opposite side of the anti-reflective surface of the anti-reflective optical film (if there are other layers in some cases) Applied to the adhesive layer and dried, and if necessary, a method of laminating the release film on the adhesive layer and winding it, or applying the adhesive layer coating material to the surface of the release film in advance in the same manner, After drying, it is produced by a method such as pressure-bonding a release film having a pressure-sensitive adhesive layer to the surface opposite to the anti-reflection surface of the anti-reflective optical film, transferring the pressure-sensitive adhesive layer, and winding it up The Since some commonly used near-infrared absorbing compounds and neon light-absorbing compounds are deteriorated by ultraviolet rays, it is important to select a compound that does not easily deteriorate or to compose a composition that does not easily deteriorate. In addition, it is also possible to incorporate an ultraviolet absorber on the external light side of the adhesive layer, that is, the hard coat layer of the anti-reflection surface, or to use a transparent substrate film containing an ultraviolet absorber to reduce the deterioration of the absorbing compound. It is effective to prevent and improve durability.

In the following, specific examples of the layer structure in the case where both the anti-reflection optical film and the optical film for PDP produced in the present invention are provided with an adhesive layer are (1) to (4) and (5) to (10), respectively. However, the present invention is not limited to these. In the following, NIR indicates that it has near infrared absorption, Ne indicates that it has neon light absorption, and AG indicates that it has antiglare properties.
Non-NIR / Ne-NeNedecreasing optical film (1) Low refractive index layer / hard coat layer / transparent substrate film / adhesive layer, (2) Low refractive index layer / high refractive index layer / hard coat layer / transparent Base film / adhesive layer, (3) low refractive index layer / high refractive index layer / AG hard coat layer / transparent base film / adhesive layer, (4) low refractive index layer / high refractive index layer / low refractive index Layer / high refractive index layer / hard coat layer / transparent substrate film / adhesive layer,
In the case of NIR / Ne reduced reflection optical film (PDP optical film) The following PDP optical film is a layer structure for PDP using a mesh type electromagnetic wave shielding transparent body, and is a thin film type electromagnetic wave shielding transparent. In the case of a PDP using a body, the near-infrared absorption performance is omitted, that is, a layer configuration in which NIR is deleted. (5) Low refractive index layer / High refractive index layer / NIR / Ne / hard coat absorption layer / Transparent substrate film / Color adjusting adhesive layer, (6) Low refractive index layer / High refractive index layer / Hard coat layer / Transparent Base film / NIR / Ne / Adhesive layer, (7) Low refractive index layer / NIR / Ne / Hard coat absorption layer / Transparent base film / Adhesive layer, (8) Low refractive index layer / Hard coat layer / Transparent group Material film / NIR / Ne / adhesive layer, (9) low refractive index layer / high refractive index layer / NIR / hard coat layer / transparent substrate film / Ne / adhesive layer, (10) low refractive index layer / high refractive index Layer / hard coat layer / transparent substrate film / NIR / Ne layer / color adjusting adhesive layer, (11) low refractive index layer / hard coat layer / transparent substrate film / NIR / Ne layer / color adjusting adhesive layer

  The anti-reflection optical film of the present invention is excellent in anti-reflection properties, antifouling properties, scratch resistance, chemical resistance and the like. In addition, since the raw materials to be used are inexpensive and the curing temperature in the production process is relatively low, the production equipment can be simplified, so that production at low cost is possible. Moreover, the low-reflection optical film having a hard coat layer, a high refractive index layer and the like is suitable for application to an optical film for PDP and the like.

  Hereinafter, the present invention will be described in more detail with reference to examples. In Examples, “part” means “part by weight” and “%” means “% by weight”.

Preparation of each coating material (1) Hard coating layer coating UV curable acrylic hard coating agent (trade name KAYANOVA POP-052AS; Nippon Kayaku Co., Ltd.) containing multifunctional acrylic monomer, polymerization initiator, etc. 100 parts), 18 parts of butyl acetate, and 42 parts of methyl ethyl ketone were sufficiently mixed and dissolved to obtain a hard coat layer coating agent.

(2) Coating agent for high refractive index layer Antimony-doped zinc oxide having a solid content of 60% (trade name Celnax CX-Z600M-3; manufactured by Nissan Chemical Industries, Ltd.) while stirring 100 parts of cationic dispersant (trade name) Solsperse 20000 (manufactured by Zeneca Co., Ltd.) 3.5 parts, and dipentaerythritol hexaacrylate (trade name KAYARAD DPHA; Nippon Kayaku Co., Ltd.) 15 parts, photopolymerization initiator (trade name Irgacure-184: 2.7 parts of Ciba Geigy Co., Ltd.), 16.4 parts of toluene and 35 parts of methyl ethyl ketone were mixed to obtain a UV curable coating for a high refractive index layer.

(3) Low refractive index layer coating
100 parts of isopropyl alcohol, 32 parts of this alkoxysilane polycondensation compound solution (content about 20 to 21%) (trade name Tosgard 510; manufactured by Toshiba Silicone) and F-free silicone graft acrylic polymer solution (content about 30%) (product) 0.9 part (name Saimak US270; manufactured by Toagosei Co., Ltd.) was mixed and dissolved. 10 parts of a 5% isopropyl alcohol solution of F-free aminosilane coupling agent (trade name KBM903; manufactured by Shin-Etsu Chemical Co., Ltd .: active ingredient 3-aminopropylmethoxysilane) was gradually added to and mixed with 40 parts of this solution. Further, 50 parts of isopropyl alcohol was added to make a uniform solution, and a coating for a low refractive index layer was obtained. The refractive index after curing of the coating film obtained from this coating agent was about 1.45.

(4) Adhesive layer coating material The materials shown in Table 1 below were sufficiently mixed and dissolved to obtain an ultraviolet absorber-containing adhesive layer coating material.
Table 1
Acrylic adhesive (trade name: PTR-2500T; manufactured by Nippon Kayaku Co., Ltd.) 100 parts UV absorber (trade name: Tinuvin 109; manufactured by Ciba Geigy Co., Ltd.) 1 part Curing agent 1 (trade name: M12ATY; manufactured by Nippon Kayaku Co., Ltd.) ) 0.5 part Curing agent 2 (trade name L45EY; manufactured by Nippon Kayaku Co., Ltd.) 0.4 part Curing agent 3 (trade name C-50; manufactured by Soken Chemical Co., Ltd.) 0.1 part Methyl ethyl ketone 70 parts (salmon) Tinuvin 109; benzotriazole compound,
M12ATY; metal chelate compound,
L45EY; isocyanate compound,
C-50; Silane coupling agent

Example 1
(1) Production of a low-reflection optical film having a hard coat layer and a high refractive index layer A roll-like PET film having a thickness of 1300 mm and a length of 1000 m having a thickness of 1300 mm and an easy-adhesion treatment on both sides (trade name; Lumirror 100U46) The hard coat layer coating agent is applied to one side of Toray Industries, Inc.) at a speed of 15 m / min so that the thickness of the cured layer becomes 8 μm with a micro gravure coater, and hot air of 50 ° C. is applied. The coating was dried while feeding. Subsequently, the coating film was continuously irradiated with ultraviolet rays and cured to obtain a film having a hard coat layer. Next, a high refractive index layer coating material was applied on the hard coat layer of the film with a microgravure coater at a speed of 25 m / min so that the thickness of the cured layer was 0.1 μm, and a temperature of 50 ° C. It was dried while supplying warm air. Next, the coating film was cured by continuously irradiating the coating film with ultraviolet rays to obtain a film having a high refractive index layer laminated thereon. Further, the above-mentioned coating agent for low refractive index layer was coated on the microgravure coater at a speed of 12 m / min so that the thickness of the layer after curing was 0.1 μm. Next, the obtained film having the coating film is supplied to a 25 m hot air dryer with the first 1/3 at 100 ° C., the middle 1/3 at 140 ° C., and the last 1/3 at 100 ° C. The coating film was dried and cured in the dryer while passing through (time required for passing through the hot air dryer: about 2 minutes). The obtained anti-reflection optical film of the present invention had a luminous reflectance of 1.2% and was excellent in scratch resistance, antifouling property and chemical resistance as described later.
The microgravure coater used in the examples and comparative examples is an apparatus in which a coater part, a dryer part, and an ultraviolet irradiation part are integrated. The film production speed is the same as the coating speed, and each film is 3 inches. It was wound up on a winding core to form a roll. The luminous reflectance was measured with an ultraviolet / visible spectrophotometer (trade name “UV-3150” manufactured by Shimadzu Corporation) equipped with a 5 ° specular reflection measuring device.

(2) Production of reduced-reflection optical film with adhesive layer The adhesive layer coating material of Table 1 was applied to the surface of a PET release film (trade name: Diafoil MR-38; manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.) having a thickness of 38 μm. It applied so that the thickness of the adhesion layer after drying might be set to 18 micrometers with a comma coater, it dried, and the peeling film which has an adhesion layer was obtained. The adhesive surface is wound around a 3 inch diameter core while roll-pressing the PET surface on the opposite side of the anti-reflective surface of the previously obtained anti-reflective optical film, and the adhesive layer is adhered to the PET surface. This invention film with the adhesion layer by which the layer was covered with the peeling film was obtained.

Example 2
Production of antiglare-providing reduced reflection optical film 160 parts of hard coat layer coating agent described in (1) above and 2.4 parts of silica fine particles having an average particle diameter of 1.8 μm (trade name SYLYSIA350; manufactured by Fuji Silysia Chemical Ltd.) Was added and dispersed uniformly. A film of the present invention is produced in the same manner as in Example 1 except that the obtained coating is used instead of the hard coat layer coating in Example 1, and a film of the present invention having excellent antiglare properties is obtained. It was.
This film was made into the film with the adhesion layer by the same method as Example 1, and this invention film which has anti-glare property with the adhesion layer by which the adhesion layer was covered with the peeling film was obtained. This film diffused external light and satisfactorily suppressed reflection of the background.

Example 3
Production of reduced reflection optical film (optical film for PDP) having adhesive layer and NIR / Ne layer UV-absorbing PET (trade name Lumirror 100QT78; Toray Industries, Inc.) instead of PET film (trade name Lumirror 100U46; manufactured by Toray Industries, Inc.) The anti-reflection optical film of the present invention was produced in the same manner as in Example 1 except that (manufactured by company) was used. The regular reflectance of the film was 1.2%, and the film had excellent scratch resistance, antifouling property and chemical resistance. A coating for near infrared and neon light absorbing layer (NIR / Ne layer) shown in Table 2 below is applied to the opposite side of the anti-reflection surface of the film so as to have a layer thickness of about 8 μm after drying. The coated surface was dried with hot air at 120 ° C. in a drier to prepare an anti-reflection optical film (PDP optical film) having a NIR / Ne layer. The near-infrared transmittance at a wavelength of 700 to 1100 nm of the film was 9%, and the neon light transmittance at a wavelength of 585 nm was 32%. An adhesive layer was provided on the NIR / Ne layer of this film in the same manner as in Example 1 to produce an NIR / Ne reduced-reflection optical film (PDP optical film) with an adhesive layer suitable for a mesh type electromagnetic wave shielding transparent body. .

Preparation of NIR / Ne layer coating agent In the ratios shown in Table 2 below, the other components shown in Table 2 below were added to methyl ethyl ketone shown in Table 2 below, and the mixture was sufficiently stirred to dissolve the added components. A coating for NIR / Ne layer was obtained.
Table 2
Acrylic resin ^* (trade name IR-G205; manufactured by Nippon Shokubai Co., Ltd.) 76.0 parts Ne light absorber (trade name TY-102; manufactured by Asahi Denka Kogyo Co., Ltd.) 0.03 parts NIR absorbent (trade name IRG) -022; manufactured by Nippon Kayaku Co., Ltd.) 0.80 parts NIR absorbent (trade name CY-40BE; manufactured by Nippon Kayaku Co., Ltd.) 0.05 parts NIR absorbent (trade name IR-12; manufactured by Nippon Shokubai Co., Ltd.) ) 0.20 parts methyl ethyl ketone 23.0 parts (Note) ^* The solid content of acrylic resin is 30%

Example 4
(Invention film for PDP with adhesive layer)
A NIR / Ne / color adjusting adhesive layer coating comprising the components and compositions described in Table 3 below, including a near infrared absorbing compound, a neon light absorber, an ultraviolet absorber, a color adjusting dye and an adhesive, and having a thickness of 38 μm The release film (trade name: Diafoil MR-38; manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.) was coated with a comma coater so that the thickness of the pressure-sensitive adhesive layer after drying was 18 μm and dried. After drying, this pressure-sensitive adhesive surface was wound around a 3 inch diameter core while roll-pressing the PET surface on the opposite side of the reduced-reflection surface of the reduced-reflection optical film obtained in Example 1 (1), and the pressure-sensitive adhesive layer The present invention film (near-infrared compound, neon light absorbing compound and optical film for PDP with a color adjusting dye-containing adhesive layer) having a NIR / Ne / color adjusting adhesive layer covered with a release film was prepared. The near-infrared transmittance at a wavelength of 700 to 1100 nm of the film was 9%, and the neon light transmittance at a wavelength of 585 nm was 32%.

Preparation of NIR / Ne / Color Adjusting Adhesive Layer Coating Agent In the ratio shown in Table 3 below, the other components shown in Table 3 below are mixed with methyl ethyl ketone shown in Table 3 below, and they are dissolved. A coating for NIR / Ne / color adjusting adhesive layer was obtained.
Table 3
Near-infrared absorbing compound (compound of formula (3) below) 1.0 part neon light absorber (trade name TAP-2) 0.1 part ultraviolet absorber (trade name Tinuvin 109) 1.2 parts yellow pigment (trade name) KAYASET Yellow GN) 0.006 parts blue dye (trade name KAYASET Blue N) 0.007 parts acrylic resin (trade name PTR-2500T) 120.0 parts hardener (trade name M12ATY) 0.32 parts hardener (product) Name L45EY) 0.44 parts curing agent (trade name C-50) 0.14 parts methyl ethyl ketone 84.0 parts (註)
TAP-2; Tetraazaporphyrin compound; Tinuvin 109 manufactured by Yamada Chemical Co., Ltd .; Benzotriazole compound; Yellow pigment (Color Index) manufactured by Ciba Geigy Corp .; Solvent Yellow 93; Blue pigment (Color Index) manufactured by Nippon Kayaku Co., Ltd. Solvent Blue 35 M12ATY manufactured by Nippon Kayaku Co., Ltd .; Metal chelate compound; L45EY manufactured by Nippon Kayaku Co., Ltd .; Isocyanate compound; C-50 manufactured by Nippon Kayaku Co., Ltd .; Silane coupling agent;

λmax; 1109 nm (dichloromethane),
Molar extinction coefficient (ε); 107000

Comparative Example 1
Instead of the low refractive index layer coating material of Example 1, a low refractive index layer coating material obtained by adding 32 parts of this alkoxysilane polycondensation compound solution (Tosgard 510) to 100 parts of isopropyl alcohol to form a uniform solution is used. A comparative film 1 was obtained in the same manner as in Example 1 except for the above.

Comparative Example 2
5. 32 parts of this alkoxysilane polycondensation compound solution (Tosgard 510; solid content 20%) contained in the coating material for low refractive index layer of Example 1 is tetraethoxysilane (trade name KBE04; manufactured by Shin-Etsu Chemical Co., Ltd.) Comparative film 2 was obtained in the same manner as in Example 1 except that 4 parts and 25.6 parts of isopropyl alcohol were used.

Comparative Example 3
Similar to Example 1 except that the aminosilane coupling agent (KBM903) contained in the coating material for low refractive index layer of Example 1 is replaced with an epoxy group-containing silane coupling agent (trade name KBM403; manufactured by Shin-Etsu Chemical Co., Ltd.). Comparative film 3 was obtained by this method.

Comparative Example 4
Except that the silicone graft acrylic polymer (Symac US270) contained in the coating material for low refractive index layer of Example 1 is replaced with an alkoxysilane compound having a fluorine-containing organic substituent (trade name XC93-A5382; manufactured by Toshiba Silicone Co., Ltd.). A comparative film 4 was obtained in the same manner as in Example 1.

  About the anti-reflective optical film obtained by said Example 1, Example 2, and Comparative Examples 1-Comparative Example 4, using the anti-reflective optical film before providing an adhesion layer as a specimen, a performance test by the following test method Went. The results are shown in Table 4.

(Anti-reflection test and evaluation criteria)
The surface on the opposite side of each sample's anti-reflective surface is roughened by sandpaper to shield it from light, and the luminous reflectance by the C light source on the de-reflective surface is measured with an ultraviolet light with a 5 ° specular reflection measuring device. Measurement was performed with a visible light spectrophotometer (trade name “UV-3150”, manufactured by Shimadzu Corporation). Evaluation criteria for reduced reflectivity: The luminous reflectance is preferably 1.5% or less, and is slightly inferior at 1.5 to 2.0%.

(Abrasion test and scratch resistance evaluation criteria)
With a surface property measuring instrument (trade name “HEIDON-14S” manufactured by Shinto Kagaku Co., Ltd.), with the anti-reflective surface of each specimen facing upward, rubbing 10 times with steel wool (# 0000) under a load of 200 g / cm 2, The scratch state was observed.
Scratch resistance evaluation criteria: Less scratches are better, and scratch resistance is excellent if 5 or less.

(Adhesion test and evaluation criteria)
The adhesion of the reduced reflection surface of each specimen was measured according to the cross-cut peel test method of JIS K5400.
Adhesiveness evaluation criteria: Adhesiveness is excellent if the grid (non-peeling degree) not peeled is 95/100 or more.

(Anti-fouling test and evaluation criteria)
2 microliters of pure water was dropped on the reduced reflection surface of each specimen at room temperature, and the contact angle was measured with a contact angle meter (trade name “contact angle meter CA-D type” manufactured by Kyowa Interface Science Co., Ltd.).
Antifouling evaluation criteria: The larger the contact angle, the better the antifouling property, and the antifouling property is excellent at 95 ° or more.

(Chemical resistance test and evaluation criteria)
After 0.2 ml of the following chemical solution was dropped with the antireflection surface of each specimen facing up and the state was maintained for 30 minutes, the presence or absence of changes in the test surface (peeling of the coating layer, discoloration, etc.) was evaluated. Test chemical solution: (1) 3% by weight sodium hydroxide aqueous solution, (2) methyl ethyl ketone, (3) 5% by weight neutral detergent aqueous solution (trade name Fresh Lime; manufactured by Nissan Soap), (4) 5% by weight alkaline detergent aqueous solution (Product name: Mypet; manufactured by Kao Corporation) Chemical resistance evaluation criteria: All chemical solutions are unchanged.

(Coating property test and evaluation criteria)
The reduced reflection surface of each specimen was cut out to a size of 100 cm × 100 cm, and the number of reflective spot-like surface defects having a size of 0.1 mm ² or more was visually counted. In addition, a reflective dotted surface defect means the point-shaped non-uniform reflection unevenness in the de-reflection surface produced by the dot hole etc. which arise when a coating film is repelled.
Evaluation criteria for coating properties: Less reflective dot-like surface defects result in less repellency on the coated surface, and a coating liquid formulation is suitable.

Evaluation result table 4

Discussion Example 1 is good in all items, and Example 2 is slightly inferior in the numerical value of luminous reflectance, but when the same film with an adhesive layer is pasted on the front surface of a 42-inch PDP via an adhesive layer, It was possible to suppress the reflection almost completely by irregularly reflecting outside light. The other items were excellent.
Comparative Example 1 is inferior in scratch resistance and chemical resistance, and Comparative Example 2 and Comparative Example 3 are inferior in scratch resistance, adhesion, and chemical resistance, and it can be judged that they were not sufficiently cured under these curing conditions. In Comparative Example 4, many reflection defects due to the repelling phenomenon occurred on the coating surface, and the coating property was poor. This is considered to be due to the influence of the alkoxysilane compound having a fluorine-containing organic substituent contained in the coating material for the low refractive index layer.
As a result, Example 1 and Example 2 were comprehensively superior to any of the comparative examples.

Claims (14)

  Thermosetting containing an oligomer of an alkoxysilane compound having no fluorine-containing organic substituent, an aminosilane coupling agent having no fluorine-containing organic substituent, a silicone graft acrylic polymer having no fluorine-containing organic substituent, and a solvent A low-reflective optical film having a low refractive index layer obtained by curing a coating layer of a resin composition on a transparent substrate film.   A reduced reflection optical film in which a hard coat layer, a high refractive index layer, and the low refractive index layer according to claim 1 are provided in this order on a transparent substrate film.   The antireflective optical film according to claim 2, wherein the high refractive index layer is a layer containing antimony-doped tin oxide or antimony-doped zinc oxide, or both.   Thermosetting containing an oligomer of an alkoxysilane compound having no fluorine-containing organic substituent, an aminosilane coupling agent having no fluorine-containing organic substituent, a silicone graft acrylic polymer having no fluorine-containing organic substituent, and a solvent After coating the coating liquid composed of the resin composition on the transparent base film or the transparent base film provided with the hard coat layer and the high refractive index layer in this order, air at 70 to 200 ° C. is supplied. A method for producing a low-reflective optical film, wherein a low-refractive index layer is formed by passing through a hot-air dryer in 0.5 to 5 minutes and successively performing a solvent drying step and a thermosetting step.   A compound that absorbs near-infrared light having a wavelength of 700 to 1100 nm in the anti-reflection optical film according to any one of claims 1 to 3 or the anti-reflection optical film obtained by the production method of claim 4 and / or Or the optical film for plasma display panels in which the layer containing the compound which has maximum absorption in wavelength 550-620 nm is provided.   The surface of the reduced reflection optical film according to any one of claims 1 to 3 or the surface of the reduced reflection optical film obtained by the production method of claim 4 opposite to the surface provided with the low refractive index layer. An optical film for a plasma display panel, comprising an adhesive layer containing a compound that absorbs near-infrared light having a wavelength of 700 to 1100 nm and / or a compound having maximum absorption at a wavelength of 550 to 620 nm on the surface. An oligomer of an alkoxysilane compound having no fluorine-containing organic substituent is represented by the following formula (1)
R _a SiX _(4-a) (1)
(In the formula, a is 0, 1 or 2, R is an organic group having no fluorine-containing organic group, and when a is 2, two Rs may be the same or different, and X is hydrolyzed. 2. The anti-reflection optical film according to claim 1, which is an oligomer of a compound represented by the following formula: wherein a plurality of Xs may be the same or different from each other.   8. The anti-reflection optical film according to claim 7, wherein R is an oligomer of an alkoxysilane compound in which R is a C1-C10 hydrocarbon residue and X is a C1-C4 alkoxy group.   The anti-reflection optical film according to claim 8, wherein R is a C1-C4 alkyl group.   2. The antireflection property according to claim 1, wherein the aminosilane coupling agent having no fluorine-containing organic substituent is an amino C1-C4 alkyl tri-C1-C3 alkoxysilane optionally having N-amino C1-C4 alkyl substitution. Optical film.   N-amino C1-C4 alkyl tri-C1-C3 alkoxysilane optionally having N-amino C1-C4 alkyl substitution is N-amino C1-C4 alkylaminopropyltri (methoxy or ethoxy) silane or aminopropyltri (methoxy or ethoxy) The reduced-reflection optical film according to claim 10, which is a silane. A silicone-grafted acrylic polymer having no fluorine-containing organic substituent is represented by the following formula (2)

[Wherein, R ₁ represents a hydrogen atom or a methyl group, R ₂ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and R ₃ represents a hydrogen atom or a methyl group. These may be the same or different for each repeating unit. n is a positive number of 1 to 10,000, m is a positive number of 1 to 3500, and p is a positive number of 1 to 500. ]
The anti-reflection optical film according to claim 1, which is a silicone-grafted acrylic polymer comprising a structural unit represented by: An oligomer of an alkoxysilane compound having no fluorine-containing organic substituent is tetra (methoxy or ethoxy) silane, methyltri (methoxy or ethoxy) silane, phenyltri (methoxy or ethoxy) silane, vinyltri (methoxy or ethoxy) silane, 3- Glycidoxypropyltri (methoxy or ethoxy) silane, 3-glycidoxypropylmethyl (methoxy or ethoxy) silane, 3-chloropropyltri (methoxy or ethoxy) silane, dimethyldi (methoxy or ethoxy) silane and diphenyldi (methoxy) Or an ethoxy) silane oligomer of at least one compound selected from the group consisting of silane) and an aminosilane coupling agent having no fluorine-containing organic substituent is N- (2-aminoethyl) aminopropyltri (methoxy or The ethoxy) silane, N- (2-aminoethyl) aminopropylmethyldi (methoxy or ethoxy) silane and 3-aminopropyltri (methoxy or ethoxy) silane are at least one selected from the group consisting of: Anti-reflective optical film. Following formula (1)
RaSiX _(4-a) (1)
(A is 0, 1, 2; R is an organic group having no fluorine-containing organic group, and when a is 2, two Rs may be the same or different, and X is a hydrolyzable group. And a plurality of Xs may be the same or different from each other) oligomers obtained by hydrolysis and dehydration condensation of compounds represented by the following formulas, aminosilane coupling agents not containing fluorine atoms, silicone-modified acrylics A thermosetting resin composition comprising a silicone-grafted acrylic polymer containing no fluorine atom obtained by copolymerization of a monomer and an acrylic monomer.