JP6911558B2 - Liquid composition for forming an optical film - Google Patents

Description

The present invention relates to an optical film forming liquid composition used for forming an optical film containing a coloring material.

As an optical lens used for a lens for sunglasses and the like, a lens provided with an optical film containing a coloring material is widely known.

In this optical film, in order to make the optical characteristics such as ultraviolet shielding property and visible light transmission more uniform in the optical film (particularly in the plane direction thereof), the coloring material is more uniformly dispersed in the optical film. It is required to be done. Therefore, there is a demand for the development of an optical film forming liquid composition capable of forming an optical film in a state in which the coloring material is more evenly dispersed.

Further, in recent years, an optical film containing a photochromic material, which is one of the coloring materials, has been proposed as a coloring material, and this optical film develops color outdoors when exposed to light including ultraviolet rays such as sunlight. Therefore, attention has been paid to the fact that it fades and exhibits transparency indoors where it is not irradiated with light including ultraviolet rays (see, for example, Patent Document 1) and can be used for both sunglasses and glasses. There is.

When an optical film contains such a photochromic material and is colored or faded depending on the presence or absence of irradiation with light including ultraviolet rays, the optical film is excellent in responsiveness of color development and fading as its required characteristic. Is required. Therefore, there is a demand for the development of a liquid composition for forming an optical film capable of forming an optical film exhibiting such characteristics.

Japanese Unexamined Patent Publication No. 11-116565

An object of the present invention is an optical film forming liquid composition capable of forming an optical film in a state in which a coloring material is more uniformly dispersed, and in particular, optics including a photochromic material which is a kind of coloring material as a coloring material. When applied to the formation of a film, it is an object of the present invention to provide an optical film forming liquid composition capable of forming an optical film having excellent responsiveness to color development and fading.

Such an object is achieved by the present invention described in the following (1) to ( 6).
(1) An optical film forming liquid composition used for forming an optical film containing a coloring material.
It contains water, a water-soluble resin, a surfactant, the coloring material, and glycols .

The coloring material is a photochromic material contained as a coloring material.
The water content is 46.2 wt% or more and 85 wt% or less, the water-soluble resin content is 5 wt% or more and 15.4 wt% or less, and the glycols content is 10 wt% or more and 20 wt% or less.
The optical film forming liquid composition is an emulsion having micelles containing the water, the surfactant, and the coloring material .

( 2 ) The liquid composition for forming an optical film according to (1 ) above, wherein the micelle has a size of 30 nm or more and 300 μm or less.

( 3 ) The liquid composition for forming an optical film according to (1) or (2) above, wherein the water-soluble resin has a content of 5 wt% or more and 15.4 wt% or less.

( 4 ) The liquid composition for forming an optical film according to any one of (1) to ( 3 ) above, wherein the content of the surfactant is 7 wt% or more and 12 wt% or less.

( 5 ) The liquid composition for forming an optical film according to any one of (1) to ( 4 ) above, wherein the colorant has a content of 0.2 wt% or more and 0.6 wt% or less.

( 6 ) The liquid composition for forming an optical film according to any one of (1) to (5 ) above, wherein the water-soluble resin is polyvinyl alcohol.

According to the present invention, an optical film can be formed in a state in which the coloring material is more evenly dispersed. Therefore, the formed optical film can exhibit more homogeneous optical characteristics.

Further, when applied to the formation of an optical film containing a photochromic material, which is one of the coloring materials, as a coloring material, the color of the optical film is developed when light including ultraviolet rays is irradiated, and when the light is not irradiated. It is possible to form an optical film having excellent color development and fading responsiveness to the fading of the optical film.

It is a schematic diagram for demonstrating the manufacturing method of the optical lens using the liquid composition for forming an optical film. It is a schematic diagram for demonstrating the manufacturing method of the optical lens using the liquid composition for forming an optical film. It is a vertical cross-sectional view which shows the embodiment of the laminated body which comprises the optical film formed by using the liquid composition for forming an optical film of this invention.

Hereinafter, the liquid composition for forming an optical film of the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.

The liquid composition for forming an optical film of the present invention is used for forming an optical film containing a coloring material, and contains water, a water-soluble resin, a surfactant, a coloring material, and glycols. It is characterized by doing.

When the liquid composition for forming an optical film used for forming the optical film has such a structure, the optical film can be formed in a state in which the coloring material is more evenly dispersed. Therefore, the formed optical film can exhibit more homogeneous optical properties, especially in the plane direction thereof.

Further, when applied to the formation of an optical film containing a photochromic material, which is one of the coloring materials, as a coloring material, the color of the optical film is developed when light including ultraviolet rays is irradiated, and when the light is not irradiated. It is possible to form an optical film having excellent color development and fading responsiveness to the fading of the optical film.

Hereinafter, prior to explaining the liquid composition for forming an optical film of the present invention, first, a method for manufacturing an optical lens (lens for sunglasses) using the liquid composition for forming an optical film will be described.

<Manufacturing method of optical lens>
1 and 2 are schematic views for explaining a method of manufacturing an optical lens using a liquid composition for forming an optical film. In the following, for convenience of explanation, the upper side of FIGS. 1 and 2 will be referred to as "upper" and the lower side will be referred to as "lower".

Hereinafter, each step of the method for manufacturing an optical lens will be described.
[1] First, a flat substrate 24 is prepared (see FIG. 1A), and an optical film-forming liquid composition containing a coloring material is supplied onto the substrate 24, and then, for example, an optical film. An optical layer 23 (optical film) is formed on the substrate 24 by drying the forming liquid composition (see FIG. 1 (b)).

When forming the optical layer 23 having a thick film thickness, a wall portion (bank) protruding in the thickness direction is provided on the outer peripheral portion of the substrate 24, and a recess formed by the substrate 24 and the wall portion is provided. After forming and supplying the liquid composition for forming an optical film into the recess, the liquid composition for forming an optical film is dried to form the optical layer 23, and then the wall portion is removed to form the optical layer 23 on the substrate 24. The optical layer 23 can be formed on the surface.

Further, the optical layer 23 may be formed on the substrate 24 by forming the optical layer 23 on a substrate different from the substrate 24 as described above, peeling the optical layer 23 from the substrate, and then joining the optical layer 23 on the substrate 24. can.

In this case, the optical layer 23 and the substrate 24 can be bonded by forming an adhesive layer containing an adhesive between them. In addition, various adhesives can be used, and examples thereof include urethane-based adhesives, silicon-based adhesives, and epoxy-based adhesives. Among them, urethane-based adhesives are preferably used.

[2] Next, the substrate 24 and the substrate 24 are joined by joining the same substrate 24 prepared in the above step [1] on the optical layer 23, that is, on the side of the optical layer 23 opposite to the substrate 24. A laminate 21 in which the optical layer 23 and the substrate 24 are laminated in this order, that is, a laminate 21 in which the optical layer 23 is sandwiched between the two substrates 24 is obtained (see FIG. 1C).

[3] Next, by attaching the protective film 10 (masking tape) to both sides of the obtained laminate 21, a film laminate 100 having the protective film 10 attached to both sides of the laminate 21 is obtained (FIG. 6). 1 (d)).

[4] Next, as shown in FIG. 2A, the film laminate 100 is punched out in the thickness direction of the film laminate 100, that is, with the protective films 10 attached to both sides of the laminate 21. Therefore, the film laminate 100 is formed to have a circular shape in a plan view.

[5] Next, as shown in FIG. 2B, the circular film laminate 100 is subjected to a thermal bending process under heating.

This thermal bending process is usually performed by press molding or vacuum forming.
The heating temperature (molding temperature) of the film laminate 100 (laminate 21) at this time is usually set to a temperature at which the laminate 21 is in a softened or melted state, whereby the laminate 21 is reliably thermally bent. be able to.

[6] Next, as shown in FIG. 2C, after the protective film 10 is peeled off from the heat-bent laminate 21, that is, the film laminate 100, the concave surface of the laminate 21 is coated with a polycarbonate resin. The constituent polycarbonate layer 30 is injection-molded. A polyamide layer made of a polyamide resin may be formed on the concave surface of the laminate 21 instead of the polycarbonate layer 30.

As a result, an optical lens 200 (lens for sunglasses) including the heat-bent laminated body 21 is manufactured.

In the method for manufacturing an optical lens as described above, by using the liquid composition for forming an optical film of the present invention for forming the optical layer 23 (optical film) in the step [1], the coloring material is more uniformly dispersed. An optical film can be formed in such a state, so that the formed optical layer 23 can exhibit more uniform optical characteristics. Hereinafter, water, a water-soluble resin, and a surfactant are used. , The optical film forming liquid composition of the present invention containing a coloring material and glycols will be described in detail.

<Liquid composition for forming optical film>
<< Water >>
Water is contained in the liquid composition for forming an optical film together with a surfactant and a coloring material, that is, water, a water-soluble resin, a surfactant, and a coloring material are contained in the liquid composition for forming an optical film. Is contained to form micelles, and the liquid composition for forming an optical film is an emulsion (emulsion) of an oil-in-water type (W / O type), and the coloring material is uniformly dispersed in the liquid composition for forming an optical film. It is included for the purpose of uniformly dissolving the water-soluble resin in the liquid composition for forming an optical film.

Examples of this water include distilled water, ion-exchanged water, pure water, RO water and the like, and among these, distilled water or ion-exchanged water is preferably used.

The content of water in the liquid composition for forming an optical film is not particularly limited, but is preferably 35 wt% or more and 85 wt% or less, and more preferably 61 wt% or more and 75 wt% or less. When the water content is at least the above lower limit value, micelles are more reliably formed in the liquid composition for forming an optical film, and the liquid composition for forming an optical film is stabilized in an oil-in-water type (W / O type). Emulsion can be obtained, so that the coloring material can be more evenly dispersed in the liquid composition for forming an optical film. Moreover, since the water-soluble resin can be more reliably dissolved, the uniformity of the water-soluble resin in the liquid composition for forming an optical film can be further improved. Further, when the water content is not more than the upper limit value, the liquid composition for forming an optical film can be relatively easily dried when the optical layer 23 is formed in the step [1].

<< Surfactant >>
The surfactant is contained in the liquid composition for forming an optical film together with water and a coloring material to form micelles, and the liquid composition for forming an optical film is made into an oil-in-water emulsion to form a coloring material. It is included to uniformly disperse in the liquid composition for forming an optical film.

The surfactant is not particularly limited, and examples thereof include nonionic (nonionic) surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants and the like.

Examples of the nonionic (nonionic) surfactant include ether-based surfactants, ester-based surfactants, ether ester-based surfactants, nitrogen-containing surfactants and the like. Examples of the anionic surfactant include various rosins, various carboxylates, various sulfates, various sulfonates, and various phosphates. Further, examples of the cationic surfactant include various ammonium salts such as a primary ammonium salt, a secondary ammonium salt, a tertiary ammonium salt and a quaternary ammonium salt. Examples of amphoteric tenside agents include various betaines such as carboxybetaine and sulfobetaine, various aminocarboxylic acids, and various phosphate ester salts.

The content of the surfactant in the liquid composition for forming an optical film is not particularly limited, but is preferably 2 wt% or more and 20 wt% or less, and more preferably 7 wt% or more and 12 wt% or less. When the content of the surfactant is within such a range, micelles are more reliably formed in the liquid composition for forming an optical film, and the liquid composition for forming an optical film is made into an oil-in-water stable emulsion. Therefore, the coloring material can be more evenly dispersed in the liquid composition for forming an optical film.

<< Color material >>
The coloring material imparts optical properties such as ultraviolet shielding property and visible light transmission to the optical layer 23 formed by using the liquid composition for forming an optical film, and by extension, the optical lens 200 provided with the optical layer 23. In the optical film forming liquid composition, by being contained together with water and a surfactant, micelles are formed, and the optical film forming liquid composition is formed as an oil-in-water emulsion. It is uniformly dispersed in the liquid composition.

Examples of the coloring material (coloring agent) include pigments and dyes, as well as coloring materials.
By appropriately selecting the types of pigments and dyes contained as the coloring material, the optical layer 23 can be colored with a desired color, and the desired optical properties such as ultraviolet shielding property and visible light transmission can be exhibited. be able to.

Further, by assuming that the coloring material contains a photochromic material as a coloring material, the optical layer 23 (optical film) is colored outdoors when exposed to light including ultraviolet rays such as sunlight, whereas ultraviolet rays are emitted. The optical lens 200 provided with the optical layer 23 can function not only as a lens for sunglasses but also as a lens for glasses. Can have.

In this case, the photochromic material is contained in the optical layer 23 formed in the step [1] in a state where micelles are formed, and due to this, the optical layer 23 is excellent in color development / fading responsiveness. It becomes a thing.

As the pigment, either an inorganic pigment or an organic pigment can be used, and examples of the inorganic pigment include carbon blacks such as furnace black, lamp black, acetylene black and channel black, iron oxide and titanium oxide. These can be mentioned, and one or a combination of two or more of these can be used. Examples of organic pigments include insoluble azo pigments, condensed azo pigments, azo pigments such as azolake, phthalocyanine pigments, perylene pigments, perinone pigments, anthraquinone pigments, quinacridone pigments, dioxane pigments, and polycyclic pigments such as thioindigo pigments. Pigments, nitro pigments, nitroso pigments, aniline blacks, daylight fluorescent pigments and the like can be mentioned, and one or a combination of two or more of these can be used.

The average particle size of the pigment is preferably 50 nm or more and 3000 nm or less, and more preferably 100 nm or more and 200 nm or less. As a result, micelles can be more reliably formed together with water and a surfactant.

Examples of the dye include acid dyes, direct dyes, reactive dyes, basic dyes and the like, and more specifically, for example, C.I. I. Acid Yellow 17, 23, 42, 44, 79, 142, C.I. I. Acid Red 52,80,82,249,254,289, C.I. I. Acid Blue 9,45,249, C.I. I. Acid Black 1,2,24,94, C.I. I. Hood Black 1, 2, C.I. I. Direct Yellow 1,12,24,33,50,55,58,86,132,142,144,173, C.I. I. Direct Red 1,4,9,80,81,225,227, C.I. I. Direct Blue 1,2,15,71,86,87,98,165,199,202, C.I. I. Dilekdo Black 19, 38, 51, 71, 154, 168, 171, 195, C.I. I. Reactive Red 14, 32, 55, 79, 249, C.I. I. Reactive blacks 3, 4, 35 and the like can be mentioned, and one or a combination of two or more of these can be used.

Examples of the color-developing material include a photochromic material that develops C (cyan), M (magenta), or Y (yellow) when irradiated with light containing ultraviolet rays and fades under conditions where light containing ultraviolet rays is not irradiated. By mixing a plurality of such photochromic materials, it is possible to prepare a material that develops a desired color.

Examples of this photochromic material include _{inorganic compounds such as tungsten oxide (WO 3} ) and silver halide (for example, AgBr), organic compounds such as spiroxazine, spiropyran, azobenzene, flugide, chromene and diarylethene compounds, and among these. One or a combination of two or more of the above can be used. More specifically, for example, JP-A-2-28154, JP-A-62-288830, WO94 / 22850 pamphlet, WO96 / 14596. Examples are those disclosed in pamphlets and the like.

The content of the coloring material in the liquid composition for forming an optical film is, for example, preferably 0.01 wt% or more and 5 wt% or less, and more preferably 0.2 wt% or more and 0.6 wt% or less. When the content of the coloring material is at least the lower limit value, the optical layer 23 formed in the step [1] is surely exhibited excellent optical characteristics such as ultraviolet shielding property and visible light transmission. Can be done. Further, when the content of the coloring material is not more than the above upper limit value, micelles are more reliably formed in the liquid composition for forming an optical film, and the liquid composition for forming an optical film is a stable emulsion of an oil-in-water type. Therefore, the coloring material can be more evenly dispersed in the liquid composition for forming an optical film.

As described above, when water, a surfactant, and a coloring material are contained in the liquid composition for forming an optical film, micelles containing these are formed in the liquid composition for forming an optical film for forming an optical film. Since the liquid composition can be an oil-in-water emulsion, the micelles can be uniformly dispersed in the liquid composition for forming an optical film. As a result, the coloring material contained in the micelles is more uniformly dispersed in the liquid composition for forming an optical film.

The size of micelles in the liquid composition for forming an optical film is preferably, for example, 30 nm or more and 300 μm or less, and more preferably 30 nm or more and 300 nm or less. When the size of the micelle is equal to or larger than the lower limit value, the optical layer 23 formed in the step [1] can surely exhibit excellent optical characteristics such as ultraviolet shielding property and visible light transmission. .. Further, when the size of the micelles is not more than the upper limit value, the micelles can be more uniformly dispersed in the liquid composition for forming an optical film.

The size of the micelles refers to the diameter of the granules formed by the coloring material and the surfactant in the liquid composition for forming an optical film.

<< Glycols >>
The glycols function as a water-retaining agent for retaining water (moisture) contained in the optical film-forming liquid composition in the optical layer 23 formed by drying the optical film-forming liquid composition. It is a thing.

When the glycols that function as such a water-retaining agent are contained in the optical layer 23 obtained from the liquid composition for forming an optical film, water (moisture) is retained in the optical layer 23 as well, so that the water (moisture) is retained at the interface with water. Micelle containing the activator and the coloring material can be reliably formed. Therefore, the coloring material contained in the optical layer 23 can be more uniformly dispersed in the optical layer 23.

Further, when a photochromic material is contained as the coloring material, the optical layer 23 contains the coloring material (photochromic material) in a state where micelles are formed in the optical layer 23, so that the optical layer 23 is irradiated with light including ultraviolet rays. The optical layer 23 can be made excellent in the color development / fading responsiveness between the color development of the above and the fading of the optical layer 23 when the light is not irradiated.

Examples of the glycols include aliphatic glycols and aromatic glycols. Examples of the aliphatic glycols include (linear) alkylene glycols such as ethylene glycol, 1,3-propylene glycol, 1,4-butene glycol, 1,6-hexene glycol, and 1,12-dodecamethylene glycol. Can be mentioned. Examples of aromatic glycols include p-xylylene glycol and the like. Furthermore, the glycols may be any of monomers, oligomers and polymers.

The content of glycols in the liquid composition for forming an optical film is, for example, preferably 3 wt% or more and 30 wt% or less, and more preferably 10 wt% or more and 20 wt% or less. When the content of glycols is within the above range, the content of glycols in the optical layer 23 obtained from the liquid composition for forming an optical film is set within an appropriate range, and water (moisture) is set in the optical layer 23. ) Can be held more reliably. Therefore, even in the optical layer 23, micelles containing water, a surfactant, and a coloring material can be more reliably formed, so that the coloring material contained in the optical layer 23 is more uniformly dispersed in the optical layer 23. Can be made to.

<< Water-soluble resin >>
The water-soluble resin is contained as a base resin in the optical layer 23 formed by drying the liquid composition for forming an optical film, maintains the shape of the optical layer 23, and forms micelles in the water-soluble resin. The purpose is to evenly disperse the coloring material in this state.

Examples of the water-soluble resin include polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), polycaprolactone diol, sodium polyacrylate, ammonium polyacrylate, polyacrylamide, modified polyamide, polyethyleneimine, polyethylene oxide and the like. , One or a combination of two or more of these can be used.

Among these, the water-soluble resin is preferably polyvinyl alcohol. As a result, the optical layer 23 formed by the liquid composition for forming an optical film can be made to have particularly excellent mechanical strength. Further, since it exhibits excellent affinity for micelles, the micelles and thus the coloring material can be more uniformly dispersed in the water-soluble resin contained in the optical layer 23.

Further, when the water-soluble resin contains polyvinyl alcohol, the saponification degree of this polyvinyl alcohol is preferably 75 or more and 100 or less, and more preferably 85 or more and 100 or less. Further, in this case, the degree of polymerization of polyvinyl alcohol is preferably 300 or more and 2400 or less, and more preferably 1000 or more and 2400 or less. As a result, polyvinyl alcohol can be dissolved in water with excellent solubility in the liquid composition for forming an optical film.

The content of the water-soluble resin in the liquid composition for forming an optical film is, for example, preferably 5 wt% or more and 50 wt% or less, and more preferably 10 wt% or more and 25 wt% or less. When the content of the water-soluble resin is within the above range, the shape of the optical layer 23 can be more reliably maintained in the optical layer 23 formed by drying the liquid composition for forming an optical film. , The coloring material can be more uniformly dispersed in the water-soluble resin in a state where the optics are formed.

Further, in the liquid composition for forming an optical film, in addition to the above-mentioned water, water-soluble resin, surfactant, coloring material, glycols, and other components, for example, a dispersant, a solvent, etc. Permeation enhancers, preservatives, antioxidants, UV absorbers, chelating agents, pH regulators, thickeners, fillers, anti-aggregating agents, defoaming agents and the like may be included.

Examples of the solvent include polar solvents and non-polar solvents, and examples of the polar solvent include those other than the above-mentioned water, such as γ-butyrolactone, acetone, acetonitrile, N, N-dimethylformamide (DMF), and dimethyl. Aprotic polar solvents such as sulfoxide (DMSO), 1,3-dimethyl-2-imidazolidinone (DMI), protic polarities such as acetic acid, methanol, ethanol, 1-propanol, 2-propanol, butanol, ethylenediamine, etc. Examples include a solvent. With such a configuration containing a polar solvent, it is possible to easily adjust the viscosity of the liquid composition for forming an optical film. Examples of the non-polar solvent include hexane, benzene, toluene, diethyl ether, chloroform, ethyl acetate, tetrahydrofuran and the like. With such a configuration containing a non-polar solvent, micelles are formed with a surfactant and water in a state in which the coloring material is dissolved or dispersed in the non-polar solvent in the liquid composition for forming an optical film. Then, the liquid composition for forming an optical film can be emulsified in an oil-in-water type.

The optical formed by forming the optical layer 23 (optical film) in the step [1] of the above-described method for manufacturing an optical lens using the above-mentioned liquid composition for forming an optical film of the present invention. In the layer 23, the coloring material can be dispersed more uniformly. Therefore, the formed optical layer 23 can exhibit more homogeneous optical characteristics. Hereinafter, the description of the optical layer 23 can be obtained in the step [2], and the substrate 24 having two optical layers 23 is obtained. This will be done by explaining the laminated body 21 having a structure sandwiched between the two.

<Laminated body 21>
FIG. 3 is a vertical cross-sectional view showing an embodiment of a laminate including an optical film formed by using the liquid composition for forming an optical film of the present invention. In the following, for convenience of explanation, the upper side of FIG. 3 is referred to as “upper” and the lower side is referred to as “lower”.

Hereinafter, since the optical layer 23 (optical film) is formed by using the liquid composition for forming an optical film of the present invention, the difference between the optical layer 23 and the liquid composition for forming an optical film of the present invention is described. The explanation will be centered, and the explanation of similar matters may be omitted.

The laminated body 21 is obtained in the step [2] and serves as a base base material for the optical lens 200, and the substrate 24, the optical layer 23, and the substrate 24 are laminated in this order, that is, The optical layer 23 is sandwiched between two substrates 24 (see FIG. 3).

<Board 24>
The substrate 24 is formed so as to cover the upper surface and the lower surface of the optical layer 23, respectively, and functions as a protective layer that protects the optical layer 23.

The substrate 24 is not particularly limited as long as it has excellent transparency, and is, for example, a polycarbonate resin layer, a polyamide resin layer, a resin layer such as a cellulose resin layer, a quartz glass layer, and soda lime glass. Examples thereof include a monolayer or a laminated body having at least one of glass layers such as a layer and a hardlex (reinforced inorganic glass) layer.

<Optical layer 23>
The optical layer 23 is made of an optical film formed by drying the liquid composition for forming an optical film of the present invention in the step [1], and includes water, a water-soluble resin, and a surfactant as constituent materials. , A coloring material, and glycols.
Hereinafter, these constituent materials will be described.

<< Water >>
Water is retained (residual) in the optical layer 23 to form micelles together with the surfactant and the coloring material in the optical layer 23, so that the coloring material is uniformly dispersed in the optical layer 23. Included to let you.

The content of water in the optical layer 23 is not particularly limited, but is preferably 3 wt% or more and 20 wt% or less, and more preferably 9 wt% or more and 13 wt% or less. When the water content is within the above range, micelles can be more reliably formed in the optical layer 23, so that the optical layer 23 is formed in a state where the coloring material is more uniformly dispersed in the optical layer 23. ..

<< Surfactant >>
The surfactant is contained in the optical layer 23 together with water and the coloring material to form micelles so that the coloring material is uniformly dispersed in the optical layer 23.

The content of the surfactant in the optical layer 23 is not particularly limited, but is preferably 4 wt% or more and 40 wt% or less, and more preferably 20 wt% or more and 30 wt% or less. When the content of the surfactant is within such a range, micelles can be more reliably formed in the optical layer 23, so that the optical layer is in a state where the coloring material is more uniformly dispersed in the optical layer 23. 23 is formed.

<< Color material >>
The coloring material is included in order to impart optical characteristics such as ultraviolet shielding property and visible light transmission to the optical layer 23 and, by extension, the laminated body 21 (optical lens 200) provided with the optical layer 23, in the optical layer 23. By being contained together with water and a surfactant, the micelles are uniformly dispersed in the optical layer 23 in a state of forming micelles.

Examples of the coloring material (coloring agent) include pigments and dyes, as well as coloring materials.
By appropriately selecting the types of pigments and dyes contained as the coloring material, the optical layer 23 can be colored with a desired color, and the desired optical properties such as ultraviolet shielding property and visible light transmission can be exhibited. be able to.

At this time, since the coloring material is uniformly dispersed in the optical layer 23 in a state where the micelles are formed, the optical layer 23 (optical film) has a more uniform ultraviolet shielding property, especially in the plane direction thereof. , It can exhibit optical characteristics such as visible light transmission.

Further, by assuming that the coloring material contains a photochromic material as a coloring material, the optical layer 23 (optical film) is colored outdoors when exposed to light including ultraviolet rays such as sunlight, whereas ultraviolet rays are emitted. The optical lens 200 provided with the optical layer 23 can function not only as a lens for sunglasses but also as a lens for glasses. Can have.

At this time, the optical layer 23 can be made excellent in color development / fading responsiveness because the photochromic material is contained in the optical layer 23 in a state where micelles are formed.

The content of the coloring material in the optical layer 23 is, for example, preferably 0.02 wt% or more and 13 wt% or less, and more preferably 0.7 wt% or more and 1 wt% or less. When the content of the coloring material is at least the above lower limit value, the optical layer 23 can surely exhibit optical characteristics such as ultraviolet shielding property and visible light transmission. Further, when the content of the coloring material is not more than the upper limit value, micelles can be more reliably formed in the optical layer 23, so that the optical layer 23 in which the coloring material is more uniformly dispersed can be obtained.

As described above, when water, the surfactant, and the coloring material are contained in the optical layer 23, micelles containing these are formed in the optical layer 23, so that the micelles are uniformly dispersed in the optical layer 23. Layer 23 is formed. As a result, the optical layer 23 is formed in a state where the coloring materials contained in the micelles are uniformly dispersed.

<< Glycols >>
The glycols are intended to function as a water-retaining agent for retaining water (moisture) contained in the optical layer 23 in the optical layer 23.

By including glycols that function as such a water-retaining agent in the optical layer 23, water (moisture) is retained in the optical layer 23, so that micelles containing water, a surfactant, and a coloring material are surely secured. Therefore, the coloring material contained in the optical layer 23 can be more uniformly dispersed in the optical layer 23.

Further, when a photochromic material is contained as the coloring material, the optical layer 23 is excellent in color development / fading responsiveness because the coloring material (photochromic material) is contained in the optical layer 23 in a state where micelles are formed. Can be.

The content of glycols in the optical layer 23 is, for example, preferably 5 wt% or more and 50 wt% or less, and more preferably 25 wt% or more and 40 wt% or less. When the content of glycols is within the above range, the content of glycols in the optical layer 23 is set within an appropriate range, and water (moisture) can be more reliably retained in the optical layer 23. .. Therefore, since micelles containing water, a surfactant, and a coloring material can be more reliably formed in the optical layer 23, the coloring material contained in the optical layer 23 can be more uniformly dispersed in the optical layer 23. ..

<< Water-soluble resin >>
The water-soluble resin is contained as a base resin in the optical layer 23 to maintain the shape of the optical layer 23 and uniformly disperse the coloring material in the water-soluble resin in a state where micelles are formed. be.

The content of the water-soluble resin in the optical layer 23 is, for example, preferably 10 wt% or more and 70 wt% or less, and more preferably 25 wt% or more and 50 wt% or less. When the content of the water-soluble resin is within the above range, the shape of the optical layer 23 can be more reliably maintained in the optical layer 23, and the color of the micelles is formed in the water-soluble resin. The material can be dispersed more evenly.

Although the liquid composition for forming an optical film of the present invention has been described above, the present invention is not limited to this, and the liquid composition for forming an optical film has an arbitrary configuration capable of exhibiting the same function. Materials can be added.

Hereinafter, the present invention will be described in more detail based on Examples. The present invention is not limited to these examples.

1. 1. Preparation of Raw Materials First, the raw materials used when preparing the liquid composition for forming an optical film used for producing the optical films of Examples and Comparative Examples are as follows.

<Photochromic material (color material)>
The diarylethene compound represented by the following formula (1)

<Surfactant>
Ester-based surfactant (glycerin fatty acid ester, manufactured by Mitsubishi Chemical Foods, "S-24D")

<Glycols>
Polyethylene glycol (manufactured by Wako Pure Chemical Industries, Ltd., "075-00616")

<Water-soluble resin>
Polyvinyl alcohol (PVA) (manufactured by Kuraray, "PVA117")
Polyvinylpyrrolidone (PVP) (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., "Bitscol K-30")

<Solvent>
Isobutanol (manufactured by Sankyo Chemical Co., Ltd., "isobutanol")

2. Production of Optical Film (Example 1A)
[1A] First, in forming an optical film, the content of water, a diarylethane compound represented by the above formula (1), an ester-based surfactant, polyethylene glycol, PVA and isobutanol is 53.7 wt%. , 0.2 wt%, 7.7 wt%, 11.5 wt%, 15.4 wt% and 11.5 wt% to prepare an optical film forming liquid composition (resin composition). When the state of the liquid composition for forming an optical film was confirmed using a microscope, micelles were observed in the liquid composition for forming an optical film, and the liquid composition for forming an optical film was an oil-in-water type (W / O type). ) Was found to form an emulsion.

[2A] Next, the prepared liquid composition for forming an optical film was supplied onto a polycarbonate substrate (manufactured by Sumitomo Bakelite Co., Ltd., "EC105") and then dried at 80 ° C. for 14 hours to obtain a polycarbonate substrate. An optical film was formed on the top, and then the optical film was peeled off from the polycarbonate substrate to obtain the optical film of Example 1A.

The water content of the obtained optical film of Example 1A, the diarylethane compound represented by the above formula (1), the ester-based surfactant, polyethylene glycol, PVA, and isobutanol were measured by a water content measuring device (ITS). When measured using "Aquatrack-3E" manufactured by Japan, it was 8.0 wt%, 0.5 wt%, 20.4 wt%, 30.4 wt%, 40.7 wt% and 0 wt%, respectively.

Moreover, when the state of the optical film was confirmed using a microscope, it was confirmed that micelles were also formed in the optical film.

(Example 2A to Example 8A, Comparative Example 1A to Comparative Example 2A)
The content of water contained in the liquid composition for forming an optical film prepared in the step [1A], the diarylethane compound represented by the above formula (1), an ester-based surfactant, polyethylene glycol, and PVA, and further. , Example 2A to Example 8A, Comparative Example 1A to Comparative Example in the same manner as in Example 1A, except that the content of PVP used in place of PVA was changed as shown in Table 1, respectively. A 2A optical film was obtained.

3. 3. Evaluation The optical films of each example and each comparative example were evaluated by the following methods.

<1> Absorbance measurement during color development For each of the optical films of each example and each comparative example, by measuring the color tone of the film immediately after irradiation with ultraviolet rays, when the optical film is irradiated with ultraviolet rays, the color is developed. The absorbance of the film was measured.

<2> Absorbance measurement during fading For each of the optical films of each example and each comparative example, by measuring the color tone of the film before ultraviolet irradiation, when the optical film is not irradiated with ultraviolet rays, the color is faded. Absorbance 1 was measured. Further, by measuring the color tone of the film after irradiating the optical film with ultraviolet rays in <1> and then allowing the film to stand at 23 ° C. for 1 minute, the optical film is irradiated with ultraviolet rays and then allowed to stand for a certain period of time to fade. Absorbance 2 at the time was measured.

Then, by taking the quotient of the absorbance at the time of color development measured in <1> and the absorbance 1 at the time of fading (absorbance at the time of color development / absorbance at the time of fading 1), the color development ratio (-) (before and after ultraviolet irradiation irradiation) is taken. Absorbance ratio in (-) (Absorbance ratio immediately after irradiation with ultraviolet rays and after standing at 23 ° C. for 1 minute) was obtained.

<3> Uniformity of Absorbance at the Time of Color Development When the optical film is irradiated with ultraviolet rays by measuring the color tone of the film immediately after irradiation with ultraviolet rays for each of the optical films of each example and each comparative example. The absorbance at the time of color development was measured. Then, the measurement of the absorbance at the time of color development was carried out at 10 points for each of the optical films of each Example and each Comparative Example, and the difference between the measured maximum value and the minimum value of the absorbance at the time of color development was deviated. The amount of deviation obtained was evaluated according to the evaluation criteria shown below.

·Evaluation criteria
◎: Less than 0.05
◯: 0.05 or more and 0.15 or less
×: Over 0.15

The evaluation results of the optical films of the Examples and Comparative Examples obtained as described above are shown in Table 1 below.

As shown in Table 1, in each example, the liquid composition for forming an optical film contains water, a water-soluble resin, a surfactant, a photochromic material (coloring material), and glycols. As a result, micelles are formed in the optical film obtained from the liquid composition for forming an optical film, so that the optical film has excellent color development / fading responsiveness and more uniform optical characteristics. Indicated.

On the other hand, in each comparative example, the liquid composition for forming an optical film does not contain either one of the surfactant and the glycols, and due to this, the liquid composition for forming an optical film In the optical film obtained from the above, micelles were not formed, and therefore, the optical film was inferior in color development / fading responsiveness, and further, it could not be said that the optical film exhibited more uniform optical characteristics.

10 Protective film 21 Laminated body 23 Optical layer 24 Substrate 30 Polycarbonate layer 100 Film laminated body 200 Optical lens

Claims (6)

An optical film forming liquid composition used for forming an optical film containing a coloring material.
It contains water, a water-soluble resin, a surfactant, the coloring material, and glycols .
The coloring material is a photochromic material contained as a coloring material.
The water content is 46.2 wt% or more and 85 wt% or less, and the glycols content is 10 wt% or more and 20 wt% or less.
The optical film forming liquid composition is an emulsion having micelles containing the water, the surfactant, and the coloring material . The liquid composition for forming an optical film according to claim 1 , wherein the micelle has a size of 30 nm or more and 300 μm or less. The liquid composition for forming an optical film according to claim 1 or 2 , wherein the water-soluble resin has a content of 5 wt% or more and 15.4 wt% or less. The liquid composition for forming an optical film according to any one of claims 1 to 3 , wherein the content of the surfactant is 7 wt% or more and 12 wt% or less. The liquid composition for forming an optical film according to any one of claims 1 to 4 , wherein the coloring material has a content of 0.2 wt% or more and 0.6 wt% or less. The liquid composition for forming an optical film according to any one of claims 1 to 5 , wherein the water-soluble resin is polyvinyl alcohol.

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