JP2023122649A - Multilayer light reflection film and eyewear equipped therewith - Google Patents

Abstract

To provide a light reflection film, etc., for adding a design property, such as a feeling of metallic luster, to an eyewear.SOLUTION: Provided is a multilayer light reflection film for eyewears in which a light reflection layer and at least one light reflection layer are laminated, wherein the light reflection layer is selected from the group consisting of a light reflection layer, a light reflection layer and a light reflection layer, the light reflection layer being a cholesteric liquid crystal layer having a reflection wavelength in a range of 610 to 630 nm, the light reflection layer being a cholesteric liquid crystal layer having a reflection wavelength in a range of 440 to 460 nm, the light reflection layer being a cholesteric liquid crystal layer having a reflection wavelength in a range of 540 to 560 nm, the light reflection layer being a cholesteric liquid crystal layer having a reflection wavelength in a range of 720 to 740 nm.SELECTED DRAWING: None

Description

The present invention relates to a light reflecting film suitable for eyewear and the like.

BACKGROUND ART So-called eyewear such as sunglasses and goggles use mirror-processed lenses to impart fashionability and anti-glare properties. In addition, a polarizing lens imparted with a polarizing function is also used in order to impart even higher antiglare properties. A polarizing element used in a polarizing lens generally uses a polyvinyl alcohol film in which iodine and/or a dichroic dye are adsorbed and oriented on a polyvinyl alcohol film. A polarizing plate is formed by bonding a transparent protective substrate to both surfaces of the polarizing element, and a polarizing lens is formed by bending. Furthermore, for the purpose of improving impact resistance or making it a lens for vision correction, an injection polarizing lens that is backed with polycarbonate resin or polyamide resin by injection molding after being subjected to bending is also widely used. . A mirror function can be imparted to the thus obtained lens surface by subjecting it to a vapor deposition process.

In some cases, a multilayer film is vapor-deposited on the surface of sunglasses in order to impart design properties or further improve visibility. By applying a multilayer film, other people can see colors such as blue, green, and red reflected on the surface of the sunglasses, and from the wearer's point of view, by reflecting specific light, glare can be reduced as well. The visibility of the scenery is further improved. Applying a multilayer film in this way is beneficial for the wearer, but there are problems in handling such as sebum and the like being difficult to remove when attached to the multilayer film, and in places such as the sea where it is exposed to moisture and sea breezes. There was a problem that the film was peeled off.
In order to solve such problems, Patent Document 1 discloses a technique in which a mirror layer made of a cholesteric liquid crystal film is provided. In the case of vapor deposition, the reflection performance is designed based on the difference in the refractive index between the air interface and the vapor deposition layer. Even if a layer is provided, the mirror feeling is not impaired. Therefore, it is possible to eliminate the occurrence of peeling and scratches due to moisture or the like.

WO2016/002582

Patent Document 1 describes color tones such as blue, green, and red in a mirror layer produced using cholesteric liquid crystals. No mode was shown.
An object of the present application is to provide a light reflecting film or the like for imparting a metallic luster design to eyewear.

The present inventors have made intensive studies to solve the above problems, and as a result, have found a multilayer light reflective film having the following structure, and have completed the present invention.

The present invention relates to, but is not limited to:
[Invention 1]
A multilayer light reflective film for eyewear comprising a light reflective layer 1 and at least one light reflective layer 2 laminated,
the light reflective layer 2 is selected from the group consisting of a light reflective layer 2a, a light reflective layer 2b, and a light reflective layer 2c;
The light reflecting layer 1 is a cholesteric liquid crystal layer having a reflection wavelength in the range of 610 to 630 nm, the light reflecting layer 2a is a cholesteric liquid crystal layer having a reflection wavelength in the range of 440 to 460 nm, and the light reflecting layer 2b is a cholesteric liquid crystal layer having a reflection wavelength in the range of 540 to 560 nm. is a cholesteric liquid crystal layer having a reflection wavelength in the range of , and the light reflection layer 2c is a cholesteric liquid crystal layer having a reflection wavelength in the range of 720 to 740 nm.
Multilayer light reflective film.
[Invention 2]
The multilayer light reflective film for eyewear according to Invention 1, wherein the light reflective layer 2b and the light reflective layer 2c are laminated as the light reflective layer 2, and the reflection color is gold.
[Invention 3]
The multi-layer light-reflecting film for eyewear according to invention 1, wherein the light-reflecting layer 2a and the light-reflecting layer 2b are laminated as the light-reflecting layer 2, and the reflection color is silver.
[Invention 4]
The multi-layer light-reflecting film for eyewear according to Invention 1, wherein a light-reflecting layer 2c is laminated as the light-reflecting layer 2, and the reflection color is copper.
[Invention 5]
A composite polarizing film for eyewear comprising the multilayer light reflective film according to any one of Inventions 1 to 4 and a polarizing element.
[Invention 6]
The composite polarizing film according to Invention 5, which has a degree of polarization of 70% or more.
[Invention 7]
An optical laminate for eyewear, wherein the multilayer light reflective film according to any one of inventions 1 to 5 or the composite polarizing film according to invention 5 is sandwiched between supports.
[Invention 8]
An eyewear lens comprising the multilayer light reflective film according to any one of Inventions 1 to 4, the composite polarizing film according to Invention 5, or the optical laminate according to Invention 6.
[Invention 9]
Eyewear comprising the lens according to invention 8.

INDUSTRIAL APPLICABILITY According to the present invention, eyewear such as polarized sunglasses can be provided with a metallic luster design.

1 is a configuration diagram of an optical layered body of the present invention; FIG.

In order to impart metallic luster to the multilayer light reflective film for eyewear of the present invention, a light reflective layer 1 and at least one kind of light reflective layer 2 are laminated. Light reflecting layer 2 is selected from the group consisting of light reflecting layer 2a, light reflecting layer 2b, and light reflecting layer 2c. The light reflection layer 1 is a cholesteric liquid crystal layer having a reflection wavelength in the range of 610-630 nm, the light reflection layer 2a is a cholesteric liquid crystal layer having a reflection wavelength in the range of 440-460 nm, and the reflection wavelength is in the range of 540-560 nm. and the light reflecting layer 2c is a cholesteric liquid crystal layer having a reflection wavelength in the range of 720 to 740 nm.

In the present application, "reflected wavelength" means the wavelength at which the reflectance is maximum. A feeling of metallic luster shown in the present invention means exhibiting a gold, silver, or copper color. Here, gold is a color obtained by laminating a light reflecting layer having a plurality of reflection wavelengths separated by at least 50 nm in the visible wavelength range of 550 to 750 nm. The silver color referred to here is a color obtained by laminating light reflecting layers having a plurality of reflection wavelengths separated by at least 50 nm in the visible wavelength range of 400 to 750 nm. Further, the copper color referred to here is a color obtained by laminating a light reflecting layer having a plurality of reflection wavelengths separated by at least 50 nm or more in the visible wavelength range of 600 to 750 nm.

The cholesteric liquid crystals (layers) used for manufacturing the light-reflecting layer of the multilayer light-reflecting film of the present invention include nematic liquid crystals having chirality and mixtures of nematic liquid crystals with a chiral agent added thereto. A method of adding a chiral agent to a nematic liquid crystal to obtain a cholesteric liquid crystal is preferable because the direction of the helix and the reflection wavelength can be arbitrarily designed by changing the type and amount of the chiral agent. Since the nematic liquid crystal used in the present invention is used in a fixed helical alignment state, unlike the so-called liquid crystal operated by an electric field, it is preferable to use a nematic liquid crystal monomer having a polymerizable group.
A nematic liquid crystal monomer having a polymerizable group is a compound that has a polymerizable group in its molecule and exhibits liquid crystallinity within a certain temperature range or concentration range. Examples of polymerizable groups include (meth)acryloyl groups, vinyl groups, carbonyl groups, cinnamoyl groups, and epoxy groups. In addition, in order to exhibit liquid crystallinity, it is preferable to have a mesogenic group in the molecule, and the mesogenic group means a group having the ability to induce liquid crystal phase behavior. Rod-shaped or plate-shaped substituents such as acid phenyl ester groups, (poly)ether groups, benzylideneaniline groups, or acenaphthoquinoxaline groups, or disk-shaped substituents such as triphenylene groups, phthalocyanine groups, or azacrown groups is mentioned. Liquid crystal compounds with rod-like or platelet-like groups are known in the art as calamitic liquid crystals.
Specific examples of nematic liquid crystal monomers having such a polymerizable group include the PALIOCOLOR series (manufactured by BASF) and the RMM series (manufactured by Merck). These nematic liquid crystal monomers having a polymerizable group can be used alone or in combination.

The chiral agent is preferably a compound capable of causing right-handed or left-handed spiral alignment of the nematic liquid crystal monomer having a polymerizable group and having a polymerizable group like the nematic liquid crystal monomer having a polymerizable group. As such a chiral agent. For example, Paliocolor LC756 (manufactured by BASF), compounds having an optically active binaphthyl structure described in JP-A-2002-179668 and JP-A-2007-271808, JP-A-2003-306491 and JP-A-2003- Examples thereof include compounds having an optically active isosorbide structure described in JP-A-313292. The amount of the chiral agent added varies depending on the type of chiral agent and the wavelength to be reflected, but is preferably about 0.5 to 30 wt%, more preferably about 1 to 20 wt%, relative to the nematic liquid crystal monomer having a polymerizable group. good.

Furthermore, it is also possible to add a polymerizable compound having no liquid crystallinity and capable of reacting with a nematic liquid crystal monomer having a polymerizable group. Examples of such compounds include UV-curable resins. Examples of UV curable resins include dipentaerythritol hexa(meth)acrylate, a reaction product of dipentaerythritol penta(meth)acrylate and 1,6-hexamethylene-diisocyanate, triisocyanate having an isocyanuric ring and penta Reaction product with erythritol tri(meth)acrylate, reaction product with pentaerythritol tri(meth)acrylate and isophorone-di-isocyanate, dipentaerythritol penta(meth)acrylate, dipentaerythritol tetra(meth)acrylate, penta Erythritol tetra(meth)acrylate, pentaerythritol tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, tris(acryloxyethyl)isocyanurate, tris(methacryloxyethyl)isocyanate Nurate, reaction product of glycerol triglycidyl ether and (meth)acrylic acid, caprolactone-modified tris(acryloxyethyl)isocyanurate, reaction product of trimethylolpropane triglycidyl ether and (meth)acrylic acid, triglycerol- Di-(meth)acrylate, reaction product of propylene glycol-di-glycidyl ether and (meth)acrylic acid, polypropylene glycol-di-(meth)acrylate, tripropylene glycol-di-(meth)acrylate, polyethylene glycol- Di-(meth)acrylate, tetraethylene glycol-di-(meth)acrylate, triethylene glycol-di-(meth)acrylate, pentaerythritol-di-(meth)acrylate, 1,6-hexanediol-di-glycidyl ether and (meth)acrylic acid reaction products, 1,6-hexanediol-di-(meth)acrylate, glycerol-di-(meth)acrylate, ethylene glycol-di-glycidyl ether and (meth)acrylic acid Reaction products, reaction products of diethylene glycol-di-glycidyl ether and (meth)acrylic acid, bis(acryloxyethyl) hydroxyethyl isocyanurate, bis(methacryloxyethyl) hydroxyethyl isocyanurate, bisphenol A-di- Reaction products of glycidyl ether and (meth)acrylic acid, tetrahydrofurfuryl (meth)acrylate, caprolactone-modified tetrahydrofurfuryl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, polypropylene glycol (meth)acrylate, polyethylene glycol (meth)acrylate, phenoxyhydroxypropyl (meth)acrylate, acryloylmorpholine, methoxypolyethyleneglycol (meth)acrylate, methoxytetraethyleneglycol (meth)acrylate, methoxytriethyleneglycol (meth)acrylate , methoxyethylene glycol (meth)acrylate, methoxyethyl (meth)acrylate, glycidyl (meth)acrylate, glycerol (meth)acrylate, ethyl carbitol (meth)acrylate, 2-ethoxyethyl (meth)acrylate, N,N-dimethyl Aminoethyl (meth) acrylate, 2-cyanoethyl (meth) acrylate, a reaction product of butyl glycidyl ether and (meth) acrylic acid, butoxytriethylene glycol (meth) acrylate, or butanediol mono (meth) acrylate, and the like. These can be used singly or in combination. When these UV curable resins having no liquid crystallinity are added, they must be added to such an extent that the liquid crystallinity is not lost. %, more preferably about 1.0 to 10% by weight.

When the nematic liquid crystal monomer having a polymerizable group or other polymerizable compound used for producing the cholesteric liquid crystal layer is of an ultraviolet curable type, a photopolymerization initiator is used to cure the composition containing it with ultraviolet light. may be added. Examples of photopolymerization initiators include 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (Omnirad TPO H manufactured by IGM resins), 1-hydroxycyclohexylphenyl ketone (Omnirad 184 manufactured by IGM resins or Irgacure 184 manufactured by BASF). ), 2-benzyl-2-(dimethylamino)-4′-morpholinobtyrophenone (OMNIRAD 369 from IGM resins), 2-dimethylamino-2-(4-methylbenzyl)-1-(4-morpholine-4- yl-phenyl)-butan-1-one (Omnirad 379 from IGM resins), bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide (Omnirad 819 from IGM resins), 2-methyl-1-[4 -(methylthio)phenyl]-2-morpholinopropan-1-one (OMNIRAD 907 from IGM resins), hydroxybenzophenone, 4-benzoyl-4'-methyldiphenylsulfide, 3,3'-dimethyl-4-methoxybenzophenone ( Benzophenone compounds such as Kayacure MBP manufactured by Nippon Kayaku Co., Ltd.; ,4-dichlorothioxanthone (Kayacure CTX manufactured by Nippon Kayaku Co., Ltd.), 2,4-diethylthioxanthone (Kayacure DETX manufactured by Nippon Kayaku Co., Ltd.), or 2,4-diisopropylthioxanthone (Kayacure DITX manufactured by Nippon Kayaku Co., Ltd.), etc. A thioxanthone-based compound and the like can be mentioned. Preferred examples include Omnirad TPO H, Omnirad 184, Omnirad 369, Omnirad 379, Omnirad 819 and Omnirad 907 (all manufactured by IGM resins). These photopolymerization initiators can be used singly or as a mixture of two or more at any ratio.

In order to accelerate the photopolymerization reaction, it is possible to use an auxiliary agent in combination, preferably when using a benzophenone-based compound or a thioxanthone-based compound. Examples of such auxiliaries are triethanolamine, methyldiethanolamine, triisopropanolamine, n-butylamine, N-methyldiethanolamine, diethylaminoethyl methacrylate, Michler's ketone, 4,4'-diethylaminophenone, 4-dimethylaminobenzoic acid. Examples include amine compounds such as ethyl, (n-butoxy)ethyl 4-dimethylaminobenzoate, and isoamyl 4-dimethylaminobenzoate.

The amount of the photopolymerization initiator and auxiliary agent to be added is preferably within a range that does not affect the liquid crystallinity of the composition used for producing the cholesteric liquid crystal layer. Specifically, it is preferably 0.5 parts by weight or more and 10 parts by weight or less, more preferably about 2 parts by weight or more and 8 parts by weight or less with respect to 100 parts by weight of the ultraviolet curable compound in the composition used. . Moreover, it is preferable to use the auxiliary agent in an amount of about 0.5 to 2 times the amount of the photopolymerization initiator.

Examples of methods for producing a light reflecting layer using the cholesteric liquid crystal include the following methods.
A nematic liquid crystal monomer having a polymerizable group is added with a necessary amount of a right-handed or left-handed chiral agent so as to reflect a desired wavelength. Next, these are dissolved in a solvent and a photopolymerization initiator is added. Next, this solution is applied onto a plastic substrate such as a PET film or the like so that the thickness is as uniform as possible. Leave for a certain period of time under temperature conditions. At this time, by subjecting the surface of the plastic film to orientation treatment such as rubbing or stretching before coating, the orientation of the cholesteric liquid crystal can be made more uniform, and the haze value of the film can be reduced. . Next, while maintaining this orientation state, the film is irradiated with ultraviolet light from a high-pressure mercury lamp or the like to fix the orientation, thereby obtaining a film having a light-reflecting layer. Here, when a chiral agent for right-handed spiral orientation is selected, the resulting light-reflecting layer is called the R-configuration, and when a chiral agent for left-handed spiral orientation is selected, the resulting light-reflecting layer is referred to as the L-configuration. In the present invention, either the R-isomer or the L-isomer, or both may be used, but it is preferable to use both.

As a preferred configuration of the present invention, for example, in order to obtain a multilayer light reflective film exhibiting a copper color, a light reflective layer 1 (reflected wavelength: 610 to 630 nm) and a light reflective layer 2b (reflected wavelength: 720 to 720 nm) are used. 740 nm), and more preferably an L-type light reflecting layer 1 (reflection wavelength: 610-630 nm) and an R-type light reflecting layer 2b (reflection wavelength: 720-740 nm). In order to obtain a multi-layer light reflective film that exhibits a silver color, light reflective layer 1 (reflected wavelength is 610 to 630 nm), light reflective layer 2a (reflected wavelength is 440 to 460 nm) and light reflective layer 2b (reflected wavelength is 540 nm). ~ 560 nm), more preferably L-type light reflection layer 1 (reflection wavelength is 610 to 630 nm), R-type light reflection layer 2a (reflection wavelength is 440-460 nm) and R-type light reflection Layer 2b (reflection wavelength 540-560 nm) is deposited. In order to obtain a multi-layer light reflective film with a gold color, light reflective layer 1 (reflected wavelength: 610 to 630 nm), light reflective layer 2b (reflected wavelength: 540 to 560 nm) and light reflective layer 2c (reflected wavelength: 720 nm) are used. ~740 nm), more preferably L-type light reflecting layer 1 (reflected wavelength is 610 to 630 nm), R-type light reflecting layer 2b (reflected wavelength is 540-560 nm) and R-type light reflection Layer 2c (reflection wavelength 720-740 nm) is deposited. As described above, if the light reflecting layer 2 is an R body, the reflectance in the region where the reflection bands overlap can be improved by making the light reflecting layer 1 (reflection wavelength 610 to 630 nm) an L body. Therefore, the difference in reflectance between the wavelength at which the maximum reflectance is exhibited and the wavelength region other than that is reduced, and as a result, it is possible to exhibit a more realistic metallic hue, which is particularly preferable. If the light reflecting layer 2 is L-form, the light reflecting layer 1 (reflection wavelength is 610 to 630 nm) may be R-form. As described above, the multilayer light reflective film for eyewear of the present invention can be obtained by laminating a plurality of light reflective layers.

The reflectance of the light-reflecting layer used in the present invention can be appropriately adjusted according to the desired metallic luster. Specifically, the maximum reflectance is preferably about 10 to 50%, more preferably about 15 to 45%. The maximum reflectance of each light reflecting layer in each wavelength region should be approximately the same, and the difference in the reflection wavelength of each light reflecting layer should be within 0 to 20%, more preferably within 0 to 15%, and more preferably 0 to 15%. It is better to keep it within 10%.

There is no particular limitation on the means for producing the multilayer light reflective film for eyewear of the present invention, but it is preferable to laminate the light reflective layer using a pressure-sensitive adhesive or an adhesive. In addition, for workability and molding stability, lamination may be performed via a support, which will be described later, if necessary. Examples of adhesives include acrylic adhesives and rubber adhesives, but acrylic adhesives are preferred because adhesiveness, holding power, and the like can be easily adjusted. Moreover, the adhesive is not particularly limited, but both a hot-melt adhesive and a curable adhesive can be used. Usually, the curable adhesive includes an ultraviolet curable resin composition and a thermosetting resin composition. In the case of an ultraviolet curable resin, a composition obtained by mixing a plurality of monomers having an acryloyl group or an epoxy group, In the presence of a photopolymerization initiator, it can be cured and adhered by irradiating with ultraviolet rays. In the case of a thermosetting resin composition, a composition obtained by mixing a plurality of monomers having an epoxy group, an acrylic resin material, a urethane resin material, a polyester resin material, a melamine resin material, an epoxy resin material, and a silicone material. A composition in which a curing agent is blended can be used. Furthermore, an adhesive in which a photochromic dye is dissolved may be used as the pressure-sensitive adhesive or the adhesive. As the photochromic dye, for example, near the boundary between blue and green (480 to 520 nm), near the boundary between green and red (580 to 600 nm), or by using a substance that absorbs light in both wavelength regions, visual recognition It is preferable because it has a role to improve the property.

The composite polarizing film for eyewear of the present invention can be obtained by further laminating a polarizing element on the multilayer light reflective film for eyewear of the present invention. As the polarizing element, there are a PVA polarizing element obtained by adsorbing a dichroic dye to PVA, and a coated polarizing element obtained by applying a dichroic dye exhibiting lyotropic liquid crystallinity to an orientation-treated base material. typically a PVA polarizing element. The production method is not particularly limited, but for example, a polymer film made of polyvinyl alcohol or a derivative thereof is adsorbed with a dye such as iodine or a dichroic dye, and the film is uniaxially stretched and oriented to produce a PVA polarizing element. be done. As the dye, a dichroic dye is preferable from the viewpoint of heat resistance, and a direct dye which is an azo dye having a sulfonic acid group is particularly preferable. The kind of dichroic dye used and, when using a plurality of dichroic dyes, the compounding ratio thereof may be appropriately adjusted so that the hue of the polarizing element becomes a desired hue. In particular, the combination of the multilayer light reflective film for eyewear of the present invention and the polarizing element allows the hue of transmission when worn as sunglasses, for example, the relative luminosity attenuation rate Q value specified in JIS T7333 regarding the visibility of traffic lights to fall within the standard. It is particularly preferable to appropriately adjust the types of dyes used in the polarizing element and, when multiple dyes are used, the compounding ratio thereof. Specifically, the Q value is adjusted to be equal to or greater than the value shown below.
Qred (red): 0.8
Qyellow: 0.6
Q green (green): 0.6
Q blue (blue): 0.4
The composite polarizing film or optical laminate of the present invention conforming to such signal visibility standards is particularly preferable as eyewear used when driving a car. The degree of polarization should be sufficient for sunglasses, preferably 70% or more, more preferably 80% or more, and even more preferably 90% or more.

By sandwiching the composite polarizing film for eyewear of the present invention thus obtained between supports, the optical laminate for eyewear of the present invention can be obtained. FIG. 1 shows an example of a configuration diagram of the optical layered body for eyewear of the present invention. The eyewear of the present invention is obtained by laminating a multilayer light reflective film 4 for eyewear in which three types of light reflective layers are laminated with an adhesive or adhesive 3 and a polarizing element 5 with an adhesive or adhesive 3. can obtain a composite polarizing film 6 for Furthermore, by sandwiching the composite polarizing film 6 for eyewear between supports 7, the optical laminate 8 for eyewear of the present invention can be obtained. Specifically, for example, an L-form light reflecting layer 1 having a reflection wavelength of 620 nm, an R-form light reflecting layer 2b having a reflection wavelength of 550 nm, and an R-form light reflecting layer 2c having a reflection wavelength of 730 nm are formed into an ultraviolet curing type. By laminating with a pressure-sensitive adhesive or adhesive 3 containing a resin, the gold multi-layered light reflection film 4 for eyewear of the present invention can be obtained. Furthermore, by laminating a so-called dye-based polarizing element 5 obtained by adsorbing a dichroic dye to polyvinyl alcohol and stretching it using an adhesive or an adhesive 3, the composite polarizing film 6 for eyewear of the present invention is obtained. . Furthermore, as the support 7, a composite polarizing film 6 for eyewear is sandwiched using a triacetyl cellulose film on the light reflecting layer side, polycarbonate on the polarizing element side, and a pressure-sensitive adhesive or adhesive 4. By doing so, the optical laminate 8 for eyewear of the present invention can be obtained.
The optical layered body for eyewear of the present invention is not limited to the above, and for example, the type and number of light reflecting layers can be changed. Further, the lamination method of the optical layered body for eyewear of the present invention is not limited to the above. A method of sequentially laminating the seed, the polarizing element, and the other support 8 may be used, or a method in which two or three kinds of light reflecting layers are sequentially laminated on the support 8 and the polarizing element is laminated on the other support 8. , and a method of bonding the two together.

As the support, resins such as polycarbonate, polyamide, and triacetylcellulose (TAC) can be used. For sunglasses or goggles that require impact resistance and heat resistance, polycarbonate is preferably used as the support, and aromatic polycarbonate having a structural unit derived from bisphenol A is more preferably used. The total light transmittance of the support is preferably 70% or more, more preferably 80% or more, still more preferably 85% or more, in order to easily ensure visibility. Further, when the optimum processing temperature of each polarizing film layer is low, for example, an aromatic polycarbonate/PCC composition (entirely alicyclic polyester composition), a polyamide having a glass transition temperature of 130° C. or less, or the like is selected. is preferred.

The optical layered body for eyewear of the present invention thus obtained is molded into a desired shape so that the light reflecting layer is on the outside, and fixed to a frame. You can get the eyewear of For example, sunglasses can be produced by punching out the optical laminate for eyewear of the present invention into a desired shape and then bending the punch. There is no particular limitation on the method of bending, and the bending may be performed through a process that can impart a shape to a spherical or aspherical surface according to the purpose. The bent product may be further injected with resin. In this case, there is also the advantage that the thickness unevenness of the optical layered body for eyewear of the present invention becomes invisible. injection is used. As the resin to be injected, it is preferable to use the same material as the layer with which the injected resin is in contact, in order to prevent deterioration of the appearance due to the difference in refractive index. A hard coat, an antireflection film, or the like is appropriately formed on the surface, and then the sunglasses are obtained by fixing them to a frame by beading, drilling, screwing, or the like.

EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited to these examples. In the present examples, the unit of formula is parts by weight.

Coating solutions A _R1 and A _L1 having compositions shown in the table below were prepared. LC756 is a chiral agent for right-handed helical orientation and compound 1 is a chiral agent for left-handed helical orientation.

Chiral agent: compound 1 (compound described in JP-A-2002-179668)

Next, coating liquids A R2 and A _R3 were prepared in the same formulation as coating liquid A _R1 except that the amount of the chiral agent in coating liquid A _R1 was changed to the amount shown in the table below.

Example 1
Using the prepared coating solution A _R1 or A _L1 , each light reflective layer is produced by the following procedure, and then these are laminated to produce a laminate (film) of the light reflective layer used in the present invention, and then a film was evaluated for the reflection color of A PET film (without undercoat layer) manufactured by Toyobo Co., Ltd. was used as the plastic substrate.
(1) Using a wire bar, each coating solution was applied onto a PET film at room temperature so that the film thickness after drying was 4 μm.
(2) The film coated in (1) was heated at 150° C. for 5 minutes to remove the solvent and convert it into a cholesteric liquid crystal phase. Then, UV irradiation was performed for 5 to 10 seconds with a high-pressure mercury lamp (UV conveyor device manufactured by Eyegraphic Co., Ltd.) at an output of 120 W to fix the cholesteric liquid crystal phase and obtain a light reflecting layer with a substrate. The obtained light reflecting layer R _R1 with substrate had a reflection wavelength of 730 nm and a maximum reflectance of 40%, and the light reflection layer R _L1 with a substrate had a reflection wavelength of 620 nm and a maximum reflectance of 43%.
(3) The substrate-attached light-reflecting layer R _R1 and the substrate-attached light-reflecting layer R _L1 prepared in (2) are attached to each other on the light-reflecting layer sides with an ultraviolet curable resin adhesive (DHR-014: Nippon Kayaku Co., Ltd. (manufactured by Harrison Toshiba Lighting Co., Ltd.) and cured by UV irradiation for 5 to 10 seconds with a high-pressure mercury lamp (manufactured by Harrison Toshiba Lighting Co., Ltd.) at 120 W output, and the multilayer light reflective film for eyewear of the present invention having PET films on both sides. got In addition, this PET film was peelable.
(4) When the reflected color of the film prepared in (3) was observed on a black mount, it exhibited a copper color with metallic luster.

Example 2
Light reflecting layers were obtained in the same manner as in Example 1, except that the prepared coating liquids A _L1 , A _R2 and A _R3 were used. The obtained light reflecting layer R _L1 with substrate had a reflection wavelength of 620 nm and a maximum reflectance of 43%, and the light reflection layer R _R2 with a substrate had a reflection wavelength of 550 nm and a maximum reflectance of 40%. The reflection wavelength of layer R _R3 was 450 nm and the maximum reflectance was 37%. Next, these light reflecting layers with substrates were laminated in the same manner as in Example 1. Specifically, the light-reflecting layer sides of the light-reflecting layer R _L1 with the substrate and the light-reflecting layer R _R2 with the substrate are bonded together using an ultraviolet curing resin adhesive (DHR-014: manufactured by Nippon Kayaku Co., Ltd.). Lamination was carried out in the same manner as in Example 1. Next, the PET film on the side of the light reflecting layer R _R2 is peeled off, and the light reflecting layer R _R2 and the light reflecting layer R _R3 with the substrate are bonded together with an ultraviolet curable resin adhesive ( DHR-014 (manufactured by Nippon Kayaku Co., Ltd.) was used for lamination in the same manner as in Example 1. Thus, a multilayer light reflective film for eyewear of the present invention was obtained. When the reflected color of this film was observed on a black mount, it exhibited a silver color with metallic luster.

Example 3
A light reflecting layer with a substrate was obtained in the same manner as in Example 1 except that the prepared coating liquids A _L1 , A _R1 and A _R2 were used. The obtained light reflecting layer R _L1 with substrate had a reflection wavelength of 620 nm and a maximum reflectance of 40% _. The reflection wavelength of layer R _R2 was 550 nm and the maximum reflectance was 35%. Next, these light reflecting layers with substrates were laminated in the same manner as in Examples 1 and 2. Specifically, the substrate-attached light-reflecting layer _RL1 and the substrate-attached light-reflecting layer _RR1 were laminated by the same operation as in Example 2 on the light-reflecting layer sides thereof. Next, the PET film on the side of the light reflecting layer _RR1 is peeled off, and the light reflecting layer _RR1 and the light reflecting layer _RR2 with the substrate are adhered to each other in the same manner as in Example 2. Laminated by Thus, a multilayer light reflective film for eyewear of the present invention was obtained. When the reflected color of this film was observed on a black mount, it exhibited a gold color with metallic luster.

Example 4
PET film on the light reflecting layer R _L1 side of the multilayer light reflecting film of Example 3 is peeled off, and a polarizing element having a light reflecting layer R _L1 and a peelable protective film (NSA33T: manufactured by San Aikaken Co., Ltd.) on one side (dye-based polarizing element NYSH-30: manufactured by Polatechno Co., Ltd.) and an ultraviolet curable resin adhesive (DHR-014: manufactured by Nippon Kayaku Co., Ltd.) in the same manner as in Example 1. A composite polarizing film for eyewear of the invention was obtained.

Example 5
The protective film on the polarizing element side of the composite polarizing film for eyewear obtained in Example 4 and the PET film on the light reflecting layer _RR2 side were peeled off, and the polarizing element side and the support (120 μm thick PC film, Teijin) ) was laminated in the same manner as in Example 1 using an ultraviolet curable resin adhesive (DHR-014: manufactured by Nippon Kayaku Co., Ltd.), and then the light reflecting layer _RR2 side and the support (80 μm thick TAC film, manufactured by IPI) was laminated in the same manner as in Example 1 using an ultraviolet curable resin adhesive (DHR-014: manufactured by Nippon Kayaku Co., Ltd.). In this way, an optical laminate for eyewear of the present invention in which the composite polarizing film for eyewear was sandwiched between supports was obtained.

Comparative Example When only the light reflecting layer R _R3 was used and the reflection color was observed in the same manner as in Example 1, the color was blue and no metallic luster was obtained.

The multilayer reflective film for eyewear, the composite polarizing film for eyewear, and the optical laminate for eyewear obtained by the present invention are films and laminates with metallic luster such as gold, silver, and copper. Designability can be imparted to the part.

1: Light reflecting layer 2b: Light reflecting layer 2c: Light reflecting layer 3: Adhesive or adhesive layer 4: Multilayer light reflecting film 5: Polarizing element 6: Composite polarizing film 7: Support 8: Optical laminate

Claims (9)

A multilayer light reflective film for eyewear comprising a light reflective layer 1 and at least one light reflective layer 2 laminated,
the light reflective layer 2 is selected from the group consisting of a light reflective layer 2a, a light reflective layer 2b, and a light reflective layer 2c;
The light reflecting layer 1 is a cholesteric liquid crystal layer having a reflection wavelength in the range of 610 to 630 nm, the light reflecting layer 2a is a cholesteric liquid crystal layer having a reflection wavelength in the range of 440 to 460 nm, and the light reflecting layer 2b is a cholesteric liquid crystal layer having a reflection wavelength in the range of 540 to 560 nm. is a cholesteric liquid crystal layer having a reflection wavelength in the range of , and the light reflection layer 2c is a cholesteric liquid crystal layer having a reflection wavelength in the range of 720 to 740 nm.
Multilayer light reflective film. 2. The multi-layer light-reflecting film for eyewear according to claim 1, wherein the light-reflecting layer 2b and the light-reflecting layer 2c are laminated as the light-reflecting layer 2, and the reflection color is gold. 2. The multi-layer light-reflecting film for eyewear according to claim 1, wherein the light-reflecting layer 2a and the light-reflecting layer 2b are laminated as the light-reflecting layer 2, and the reflection color is silver. 2. The multi-layer light-reflecting film for eyewear according to claim 1, wherein a light-reflecting layer 2c is laminated as the light-reflecting layer 2, and the reflection color is copper. A composite polarizing film for eyewear comprising the multilayer light reflective film according to any one of claims 1 to 4 and a polarizing element. 6. The composite polarizing film according to claim 5, having a degree of polarization of 70% or more. 6. An optical laminate for eyewear, wherein the multilayer light reflective film according to any one of claims 1 to 5 or the composite polarizing film according to claim 5 is sandwiched between supports. An eyewear lens comprising the multilayer light reflective film according to any one of claims 1 to 4, the composite polarizing film according to claim 5, or the optical laminate according to claim 6. Eyewear comprising the lens according to claim 8.