JP4742636B2 - Plastic lens dyeing method - Google Patents

Description

  The present invention relates to a plastic lens dyeing method in which a plastic lens is immersed in a dyeing solution for dyeing.

Plastic lenses, particularly plastic lenses for spectacles, are used in color for imparting fashionability and protecting eyes. As a coloring method, the method of dying by immersing a plastic lens in a dyeing liquid in which a dye is dispersed in a solvent is simple, wide choice of colors, half and gradation dyeing, etc. Widely used in.
Dyeing is performed on the plastic lens base material itself and the hard coat film provided on the base material. Further, if necessary, an optical functional film such as an antireflection film is formed on the surface of the plastic lens after dyeing.
In the method of dying by immersing a plastic lens in a staining solution, it is known to add a surfactant as a dispersing agent to the staining solution in order to disperse the dye in a solvent (for example, see Patent Document 1). .

JP-A-9-146050 (page 3, paragraph number [0010])

However, the surfactant as a dispersing agent causes bubbles to be generated in the staining solution and on the surface. Foam generated by the surfactant adheres to the surface of the plastic lens, and the dyeing liquid does not contact the portion where the foam is adhered. Here, if the bubbles do not move easily, the portion cannot be impregnated with the dye. Accordingly, there is a problem that uneven dyeing and non-dyeing (hereinafter, uneven dyeing, etc.) occur in that part. Unevenness of dyeing or the like impairs the appearance of the plastic lens. In particular, in half and gradient dyeing, which dyes approximately half of plastic lenses, the plastic lens is dyed while being immersed in the dyeing solution half and swung up and down. large.
In addition, since bubbles are more difficult to move when bubbles are attached to the hard coat film, etc. than when bubbles are attached to the plastic lens substrate itself, problems such as uneven dyeing can occur with the hard coat film. More frequently when dyeing.

  An object of the present invention is to provide a method for dyeing a plastic lens with less occurrence of uneven dyeing.

The method for dyeing a plastic lens according to the present invention is a method for dyeing a plastic lens in which a plastic lens is immersed in a dyeing liquid in which a plurality of dyes are mixed, and is a fluorine-based surfactant for one liter of the dyeing liquid. 0.02-2.0g was added, It is characterized by the above-mentioned.

According to this invention, since the hydrophobic group containing fluorine is disposed on the atmosphere side on the surface of the bubbles generated in the staining liquid, the surface energy is lower than that of the hydrophobic group not containing fluorine. That is, even if bubbles adhere to the surface of the plastic lens, the adhesion is weak and the plastic lens moves easily. Therefore, uneven dyeing and the like are unlikely to occur.
When the concentration of the fluorosurfactant is 0.02 g or more with respect to 1 liter of the dyeing solution, the surface energy of the foam is lowered until the foam attached to the surface becomes slippery.
Further, if the concentration of the fluorosurfactant is 2.0 g or less with respect to 1 liter of the dyeing solution, there are few economic disadvantages as long as the fluorosurfactant is added.
In the present invention, the plastic lens refers to both a plastic lens substrate itself and a plastic lens having a hard coat film or the like formed on the surface thereof.

In this invention, the structure which added the carrier agent to the said dyeing | staining liquid is preferable.
In this invention, since the dyeing solution contains a carrier agent, impregnation of the dye is promoted. In addition, even if a carrier agent made of an organic compound is added to the staining solution, the hydrophobic group of the surfactant contains fluorine having a low affinity with the organic compound, so fluorine is arranged on the surface of the generated foam, The aforementioned effects can be achieved.

In the present invention, it is preferable that the plastic lens has a dyeable coat film, and the coat film contains an organosilicon compound.
In this invention, a plastic lens having a coat film that can be dyed such as a hard coat film and an antireflection film on the surface, even if the surface energy is different, the surface energy of the foam arranged on the surface is lower, so In addition to the functions of the coating film itself, the above-described effects can be achieved.

  In addition, even when the coating film contains an organosilicon compound, the surface energy of the coating film surface is high, and bubbles generated in the staining solution are likely to adhere, the surface energy of the bubbles arranged on the surface is even lower. Therefore, the above-described effects can be further achieved.

Embodiments of the present invention will be described below.
In the plastic lens dyeing method of this embodiment, the plastic lens is immersed in a dyeing solution in which the dye is dispersed, and the dye is impregnated from the surface of the plastic lens to dye the plastic lens.

Hereinafter, the plastic lens used in the present embodiment will be described in more detail.
The base material of the plastic lens is not particularly limited, and examples thereof include diethylene glycol bisallyl carbonate polymer, polyurethane resin, acrylic resin, polycarbonate resin, and polystyrene.

On the surface of the plastic lens substrate, a primer layer that serves to bond the hard coat film or the plastic lens substrate and the hard coat film may be formed.
Dyeing may be performed on the plastic lens substrate itself or may be performed on the hard coat film formed on the plastic lens. If the primer layer is provided, the hard coat film and the primer layer are dyed.

Dyeable hard coat film contains inorganic fine particles to give hardness, coupling agent between inorganic compound and organic compound, organosilicon compound as binder, polyfunctional epoxy compound as dyeing component, and curing catalyst Formed from a composition for hard coating.
The inorganic fine particles are particles having an average particle size of 1 to 100 mμm. Inorganic fine particles include one or more oxide fine particles or composite oxides of metals selected from Si, Al, Sn, Sb, Ta, Ce, La, Fe, Zn, W, Zr, In, and Ti. Can be illustrated. Specifically, colloidally dispersed inorganic oxide fine particles such as SiO ₂ , SnO ₂ , Sb ₂ O ₅ , CeO ₂ , ZrO ₂ , TiO ₂ in water, alcohols or other organic solvents, Alternatively, composite fine particles composed of two or more inorganic oxides of Si, Al, Sn, Sb, Ta, Ce, La, Fe, Zn, W, Zr, In, and Ti are mixed with water, alcohol, or other organic materials. The thing disperse | distributed colloidally to the solvent can be illustrated. In either case, an average particle size of 1 to 100 mμm is used, but a range of 5 to 30 mμm is preferable.

  The kind and blending amount of the inorganic fine particles are determined by the target hardness, refractive index, etc., but the blending amount is 5 to 80% by weight, particularly 10 to 50% by weight of the solid content in the hard coat composition. It is preferably in the range of% by weight. If the blending amount is too small, the adhesion with the antireflection film made of an inorganic material formed on the hard coat film may be insufficient, or the wear resistance of the hard coat film may be insufficient. Moreover, when there are too many compounding quantities, a crack will arise in a hard-coat film | membrane and dyeing | staining property may become inadequate.

  Examples of the organosilicon compound include vinyl trialkoxysilane, vinyltrichlorosilane, vinyltri (β-methoxy-ethoxy) silane, allyltrialkoxysilane, acryloxypropyltrialkoxysilane, methacryloxypropyltrialkoxysilane, methacryloxypropyldioxysilane. Alkoxymethylsilane, γ-glycidoxypropyltrialkoxysilane, β- (3,4-epoxycyclohexyl) -ethyltrialkoxysilane, mercaptopropyltrialkoxysilane, γ-aminopropyltrialkoxysilane, N-β (aminoethyl) ) -Γ-aminopropylmethyl dialkoxysilane. These compounds may be used as a mixture of two or more. Moreover, it is more effective to use after hydrolyzing.

  The organosilicon compound is preferably in the range of 10 to 70% by weight, particularly 20 to 60% by weight of the solid content in the hard coat composition. If the amount is too small, the adhesion with the antireflection film may be insufficient. On the other hand, if the amount is too large, it may cause cracks in the cured coating.

  The polyfunctional epoxy compound functions as a dye component of the hard coat film. In addition, the polyfunctional epoxy compound can improve the water resistance and warm water resistance of the hard coat film, and even if it is immersed in a high temperature dyeing solution for a long time during dyeing, it effectively prevents the generation of cracks. Can be suppressed. Furthermore, the hard coat film containing the polyfunctional epoxy compound can improve the impact resistance of the plastic lens.

  Polyfunctional epoxy compounds are widely used for adhesives, casting, etc., and are obtained from, for example, polyolefin epoxy resins synthesized by peroxidation methods, cyclopentadiene oxide, cyclohexene oxide, hexahydrophthalic acid and epichlorohydrin. Alicyclic epoxy resins such as polyglycidyl esters, polyhydric phenols such as bisphenol A, catechol, and resorcinol, or (poly) ethylene glycol, (poly) propylene glycol, neopentyl glycol, glycerin, trimethylolpropane, pentaerythritol, di Obtained from polyglycidyl ether obtained from polyhydric alcohols such as glycerol and sorbitol and epichlorohydrin, epoxidized vegetable oil, novolac phenolic resin and epichlorohydrin Epoxy novolac, epoxy resin obtained from phenolphthalein and epichlorohydrin, glycidyl methacrylate and methyl methacrylate acrylic monomer or copolymer such as styrene, and further the above epoxy compound and monocarboxylic acid-containing (meth) acrylic acid Examples thereof include epoxy acrylate obtained by a glycidyl group ring-opening reaction.

It is recognized that when a hydroxyl group is present in the molecule of the polyfunctional epoxy compound, adhesion to other coating films and dyeability are improved. Therefore, the polyfunctional epoxy compound preferably contains a plurality of epoxy groups and one or more hydroxyl groups in one molecule.
For example, neopentyl glycol diglycidyl ether, trimethylolpropane diglycidyl ether, glycerol diglycidyl ether, diglycerol triglycidyl ether, diglycerol triglycidyl ether, pentaerythritol diglycidyl ether, pentaerythritol triglycidyl ether, tris (2-hydroxy Ethyl) isocyanurate diglycidyl ether, phenol novolac polyglycidyl ether, cresol novolac polyglycidyl ether and the like can be preferably used. In this embodiment, one kind of a polyfunctional epoxy compound having a plurality of epoxy groups and one or more hydroxyl groups in one molecule is used alone, or two or more kinds are used in combination, and a hydroxyl group is contained in one molecule. It can be used in combination with a polyfunctional epoxy compound that does not have.

  The compounding amount of the polyfunctional epoxy compound is 5 to 40% by weight of the solid content in the hard coat composition when the hard coat film is directly formed on the base material of the plastic lens, but is formed through the primer layer. In this case, since the dyeability is improved by the presence of the primer layer, it can be reduced to a range of 0.1 to 25% by weight, preferably 0.5 to 20% by weight. If the amount is too small, the water resistance of the hard coat film may be insufficient. On the other hand, if the amount is too large, the adhesion with the antireflection film tends to be insufficient.

  The curing catalyst is added as a curing catalyst for silanol or an epoxy compound, and preferable ones are perchloric acids such as perchloric acid, ammonium perchlorate, and magnesium perchlorate, Cu (II), Zn (II). , Co (II), Ni (II), Be (II), Ce (III), Ta (III), Ti (III), Mn (III), La (III), Cr (III), V (III) , Amino acids such as acetylacetonate, amine, glycine and the like having a central metal atom, Co (III), Fe (III), Al (III), Ce (IV), Zr (IV), V (IV), etc., Lewis acid And organic acid metal salts. Among these, in this embodiment, acetylacetonate of magnesium perchlorate, Al (III), and Fe (III) is more preferable in terms of curing conditions, pot life of the coating liquid, and the like. The addition amount is preferably in the range of 0.01 to 5.0% of the solid content concentration.

The hard coat composition containing these is diluted with a solvent, if necessary. As the solvent, solvents such as alcohols, esters, ketones, ethers and aromatics are used.
In addition to the above-mentioned components, the hard coat composition of the present embodiment includes a small amount of surfactant, antistatic agent, ultraviolet absorber, antioxidant, disperse dye, oil-soluble dye, fluorescent dye as necessary. Furthermore, pigments, photochromic compounds, light-resistant heat-resistant stabilizers such as hindered amines and hindered phenols, and the like can be added to improve the coating properties of the hard coat solution and the coating performance after curing. In particular, it is possible to impart excellent weather resistance to the hard coat film by adding one or more selected from light- and heat-resistant stabilizers such as UV absorbers, antioxidants, hindered amines and hindered phenols. It is.

The hard coat composition is applied and cured by dipping, spinner, spray, or flow method after applying the hard coat composition to the plastic lens substrate, and at a temperature of 40 to 200 ° C. for several hours. A hard coat film is formed by heating and drying.
The film thickness of the hard coat layer is preferably in the range of 0.05 to 30 μm, particularly about 0.1 to 20 μm. If it is too thin, basic performance may not be exhibited, whereas if it is too thick, optical distortion may occur.

In the present embodiment, a primer layer may be provided between the plastic lens substrate and the hard coat layer.
As the main component of the primer layer, an aqueous acrylic-urethane resin or a polyester-based thermoplastic elastomer is preferable. These main components can greatly improve the impact resistance of the plastic lens, and are excellent in water resistance and light resistance, and also in excellent adhesion to a dyeable hard coat layer.
The polyfunctional epoxy compound contained in the hard coat film has excellent adhesion specifically to the water-based acrylic-urethane resin and polyester-based thermoplastic elastomer of the primer layer. Furthermore, due to the presence of the primer layer, the dyeability is much higher than when a dyeable hard coat film is formed on a plastic lens substrate. Therefore, when the primer layer is provided, it is possible to reduce the blending amount of the polyfunctional epoxy compound in the hard coat film, and after securing sufficient dyeability, the hardness, that is, the scratch resistance is improved. A plastic lens is obtained.

Since these resins have a refractive index of about 1.5, interference fringes occur when they are provided on a plastic lens substrate having a high refractive index. Therefore, it is preferable to adjust the refractive index by blending metal oxide fine particles into the primer layer.
As such metal oxide fine particles, one or more oxide fine particles of a metal selected from Si, Al, Sn, Sb, Ta, Ce, La, Fe, Zn, W, Zr, In, and Ti are used. Or a complex oxide can be illustrated. Specifically, colloidally dispersed inorganic oxide fine particles such as SiO ₂ , SnO ₂ , Sb ₂ O ₅ , CeO ₂ , ZrO ₂ , TiO ₂ in water, alcohols or other organic solvents, Alternatively, composite fine particles composed of two or more inorganic oxides of Si, Al, Sn, Sb, Ta, Ce, La, Fe, Zn, W, Zr, In, and Ti are mixed with water, alcohols, or other organic materials. The thing disperse | distributed colloidally to the solvent can be illustrated. In any case, the average particle size is preferably about 1 to 300 mμm.

The ratio of the metal oxide fine particles to the solid content in the primer composition is preferably 0 to 65% by weight, particularly 55% by weight or less. If it exceeds 65% by weight, the primer layer may become cloudy and the appearance may deteriorate.
The primer composition for forming the primer layer is obtained by, for example, blending metal oxide fine particles in an aqueous solution containing an aqueous acrylic-urethane resin and diluting with a solvent as necessary. As the solvent, solvents such as alcohols, esters, ketones, ethers and aromatics are used. Various conventionally known additives such as a leveling agent may be added. The primer layer can be formed by applying the prepared primer composition to a plastic lens substrate by a method such as spin coating or dipping, drying, and curing.
The film thickness of the primer layer is preferably 0.01 μm to 50 μm, particularly preferably 0.1 μm to 30 μm. When the primer layer is too thin, the improvement of the dyeability and impact resistance of the hard coat film is reduced. On the other hand, if it is too thick, the smoothness of the flat surface is impaired, and optical distortion may occur.

Hereinafter, the staining solution used for staining will be described in more detail.
In the present embodiment, a fluorosurfactant is added to the staining solution. The dyeing liquid is obtained by dispersing a dye in a solvent and adding a carrier agent and other additives that promote the impregnation of the dye.
As dyes, nitroso dyes, nitro dyes, azo dyes, stilbene azo dyes, ketoimine dyes, triphenylmethane dyes, xanthene dyes, acridine dyes, quinoline dyes, methine dyes, polymethine dyes, thiazole dyes, indamine dyes, indophenol dyes, Examples include azine dyes, oxazine dyes, thiazine dyes, sulfur dyes, aminoketone dyes, oxyketone dyes, anthraquinone dyes, indigoid dyes, and phthalocyanine dyes, and at least one of them can be used.
As the solvent, water is usually used, but an organic solvent such as methanol, ethanol, benzyl alcohol or the like may be used in combination.

  A surfactant can be added to the dyeing liquid as a dispersant for the dye. Examples of surfactants include anionic surfactants such as alkyl benzene sulfonates, alkyl naphthalene sulfonates, alkyl sulfosuccinates, aromatic sulfonic acid formalin condensates, lauryl sulfates, polyoxyethyl alkyl ethers, alkyls. Nonionic surfactants such as amine ethers and polyoxyethylene sorbitan fatty acid esters are listed. These surfactants are preferably used in the range of 5 to 200% by weight based on the amount of dye used depending on the color density of the lens.

  As the carrier agent, a water-soluble organic solvent is often used. Various types are presented in Japanese Patent No. 83501, Japanese Patent Laid-Open No. 04-41785, and the like. An example is benzyl alcohol. It is preferable to add 0.1 to 20 parts by weight of the carrier agent.

As the fluorine-based surfactant, it is sufficient if the hydrophobic group contains fluorine, and those having a perfluoroalkyl group are preferable. Further, nonionic, amphoteric and nonionic are preferred, but cationic and anionic may also be used.
In this embodiment, 0.02 to 2.0 g of these fluorosurfactants are added to 1 liter of the dyeing liquid to obtain a dyeing liquid. Preferably, 0.05 to 2.0 g of a fluorosurfactant is added to 1 liter of the staining solution to obtain a staining solution. More preferably, 0.05 to 1.0 g of a fluorosurfactant is added to 1 liter of the staining solution to obtain a staining solution.

The lens is dyed by dispersing the dye in a solvent, adding an additive, and immersing the lens in a dyeing solution heated to 70 to 95 ° C. The staining density is proportional to the staining time. In the case of dyeing with a predetermined color tone, the toning and dyeing time are determined as a standard color, and when there is a sample color, the sample color is analyzed with a spectrophotometer to perform the color adjustment. This toning can be performed by computer processing the target color data obtained by measuring with a spectrophotometer and obtaining an appropriate dyeing bath and dyeing time.
By immersing in the above dyeing solution for an appropriate dyeing time, a plastic lens free from uneven dyeing can be obtained.

According to this embodiment, there are the following effects.
(1) Since the hydrophobic group containing fluorine is arranged on the atmosphere side on the surface of the bubbles generated in the staining solution, the surface energy can be further reduced as compared with the hydrophobic group not containing fluorine. That is, even if bubbles adhere to the surface of the plastic lens, the adhesive force is weak and it can be easily moved. Therefore, uneven dyeing and the like can be hardly generated.
If the density | concentration of a fluorochemical surfactant is 0.02g or more with respect to 1 liter of dyeing | staining liquids, the surface energy of a bubble can be reduced until the bubble adhering to the surface becomes slippery.
Further, if the concentration of the fluorosurfactant is 2.0 g or less with respect to 1 liter of the dyeing solution, economical disadvantages can be reduced within a range having the effect of adding the fluorosurfactant.

(2) When a plurality of dyes are mixed and used in the dyeing solution, the effect on the impregnation rate of the surfactant for each dye is different. Therefore, if the concentration of the surfactant is high, the color tone after dyeing It will change. Here, when the amount of the surfactant is 2.0 g or less with respect to 1 liter of the dyeing liquid, the influence on the impregnation rate of each dye can be reduced even if a plurality of dyes are present. That is, it is possible to prevent the occurrence of uneven dyeing while suppressing changes in color tone. More preferably, if the amount of the fluorosurfactant is 1.0 g or less with respect to 1 liter of the dyeing solution, the influence on the impregnation rate of each dye can be further reduced.

(3) Since the dyeing solution contains a carrier agent, the impregnation of the dye can be promoted. In addition, even if a carrier agent made of an organic compound is added to the staining solution, the hydrophobic group of the surfactant contains fluorine having a low affinity with the organic compound, so fluorine is arranged on the surface of the generated foam, The aforementioned effects can be achieved.

(4) A plastic lens provided with a coat film that can be dyed such as a hard coat film or an antireflection film on the surface, and even if the surface energy is different, the surface energy of the foam placed on the surface can be lowered, and the coat In addition to the function of the film itself, the above-mentioned effects can be achieved.

(5) Even when the coating film contains an organosilicon compound, the surface energy of the coating film surface is high, and bubbles generated in the dyeing solution are likely to adhere, the surface energy of the bubbles arranged on the surface is more The above-mentioned effect can be achieved.

EXAMPLES Hereinafter, although an Example demonstrates this invention in more detail, this invention is not limited to these Examples.
[Example]
In the examples, two types of plastic lenses having different refractive indexes formed with a hard coat film were prepared and dyed.
The production of a medium refractive index plastic lens having a refractive index of 1.55 will be described in detail below.
The plastic lens was obtained by injecting a photopolymerizable composition into a mold and polymerizing it by irradiating light.
(1) Assembly of plastic lens manufacturing mold Convex glass mold and concave glass mold designed to have a power of +3.00 diopters when the refractive index of the plastic lens substrate is 1.55 (diameter is 80 mm ) In this order in a water bath containing a surfactant and in a water-only bath, and after ultrasonic cleaning to remove the dirt on the surface, it is immersed in a bath of isopropyl alcohol to remove the attached water. did.
Next, didecyl acid phosphate, which is a phosphate ester, is diluted with isopropyl alcohol as a mold release agent, and a solution prepared to have a concentration of 1000 ppm is spinned onto the use surfaces of the convex and concave glass molds previously washed. The coating method was applied. As the coating conditions at this time, 5 cc of a diluent of a release agent was dropped at a rotation speed of 500 rpm, and then rotated at 2000 rpm for 10 seconds to obtain a glass mold uniformly coated with the release agent.
Thereafter, the outer periphery of the two glass molds was wound with a lens polymerization tape (the base material was polyethylene terephthalate, the thickness was 50 μm, and the adhesive was acrylic), and a plastic lens manufacturing mold was assembled.

(2) Preparation of photopolymerization composition 40 g of epoxy dimethacrylate obtained by reacting bisphenol A diglycidyl ether and methacrylic acid, 20 g of nonabutylene glycol dimethacrylate, 25 g of phenyl methacrylate, isophorone diisocyanate and 2-hydroxypropyl methacrylate 15 g of urethane dimethacrylate obtained by reaction, 0.03 g of 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 0.1 g of t-butylperoxyisobutyrate, 0.05 g of 2-hydroxy-4-methoxybenzophenone, After 0.2 g of tridodecyl phosphate was mixed and stirred well at room temperature, the pressure was reduced to 50 mmHg and deaerated for 10 minutes to obtain a photopolymerization composition.

(3) Molding of plastic lens After injecting the photopolymerization composition into the plastic lens manufacturing mold prepared above, the mold was irradiated with ultraviolet rays of 30 J / cm ² from both sides with a 10-inch long lamp and a 2 kW high-pressure mercury lamp. did. Thereafter, the mold was removed from the plastic lens, but the plastic lens and the glass mold were not broken or damaged at all, and the mold release property was good. Thereafter, annealing was performed at 130 ° C. for 2 hours to obtain a plastic lens. The obtained lens was colorless and transparent.

(4) Preparation of hard coat composition After mixing 197.3 g of methyl cellosolve and 364.8 g of methanol-dispersed colloidal silica (manufactured by Catalytic Chemical Industry Co., Ltd., trade name “Oscar 1132” solid content concentration 30 wt%), γ -184.5 g of glycidoxypropyltrimethoxysilane were mixed. To this mixed solution, 51.0 g of 0.05N hydrochloric acid aqueous solution was added dropwise with stirring, and the mixture was further stirred for 4 hours and then aged overnight. , 0.2 g of a trade name “L-7001”), 0.9 g of a hindered phenolic antioxidant (manufactured by Nippon Ciba-Geigy Co., Ltd., trade name “IRGANOX1010”), and an dye for anthraquinone oil (Mitsubishi Kasei Co., Ltd.) Manufactured, trade name “Diaresin Blue J”) 0.02 g was added, and the mixture was stirred for 4 hours and then aged overnight to obtain a composition for hard coat.

  The hard coat composition thus obtained was applied to the alkali-treated plastic lens by a dipping method. The pulling speed was 15 cm / min. After the coating, it was air-dried at 80 ° C. for 20 minutes and then baked at 130 ° C. for 120 minutes. The hard coat film thus obtained had a thickness of about 2 μm and an excellent appearance.

Hereinafter, the production of a high refractive index plastic lens having a refractive index of 1.67 will be described in detail.
A primer layer and a hard coat film were formed on the high refractive index plastic lens.
(1) Formation of primer layer 186 g of commercially available water-based polyester “A-160P” (manufactured by Takamatsu Yushi Co., Ltd., solid content concentration 25%), 257 g of methanol, 15 g of water, 37 g of butyl cellosolve, and γ-glycidoxypropyl 5 g of trimethoxysilane and 0.1 g of a silicon surfactant (manufactured by Nippon Unicar Co., Ltd., trade name “L-7604”) were added and stirred for 3 hours. This primer composition was applied on a plastic lens substrate for Seiko Sovereign (trade name) (Seiko Epson Corporation, refractive index: 1.67) by a dipping method (pickup speed: 15 cm / min). The base material coated with the primer composition was heat-treated at 100 ° C. for 20 minutes to form a primer layer having a layer thickness of 1.0 μm on the base material.

(2) Formation of hard coat film 73 g of butyl cellosolve, 148 g of methanol, and 57 g of γ-glycidoxypropyltrimethoxysilane were mixed. To this mixed solution, 18 g of 0.1N hydrochloric acid aqueous solution was added dropwise with stirring. After further stirring for 3 hours, the mixture was aged overnight. In this solution, 146 g of methanol-dispersed SiO ₂ fine particle sol (manufactured by Catalyst Kasei Kogyo Co., Ltd., trade name “Oscar 1132” solid content concentration 30%), diglycerol polyglycidyl ether (manufactured by Nagase ChemteX Corporation, trade name “Deconal EX- 421 ") 50 g, magnesium perchlorate 3 g, silicon surfactant (manufactured by Nippon Unicar Co., Ltd., trade name" L-7001 ") 0.16 g, phenolic antioxidant (manufactured by Kawaguchi Chemical Co., Ltd., product) After adding 0.6 g of the name “ANTAGE CRYSTAL” and stirring for 4 hours, it was aged overnight to obtain a composition for hard coat.

  This hard coat composition was applied on the primer layer by a dipping method (pickup speed 30 cm / min). The substrate coated with the hard coat composition was heat-treated at 125 ° C. for 3 hours to form a hard coat layer having a thickness of 2.5 μm.

In this example, the two types of plastic lenses obtained were dyed by the following method, and uneven dyeing and the like were evaluated.
(Preparation of staining solution)
To 1 liter of water heated to 70 ° C., 1.4 g of Dianix Blue AC-E (manufactured by Mitsubishi Kasei Hoechst Co., Ltd.), 0.1 g of Miketon Polyester Red4BF # 300 (manufactured by Mitsui Toatsu Dye Co., Ltd.), and Miketon Fast Brown 3R ( 0.6 g of Mitsui Toatsu Dye Co., Ltd.), 3 cc of Mama Lemon (Lion Yushi Co., Ltd.) as a surfactant, and 30 cc of benzyl alcohol as a carrier agent were stirred and used as a dyeing solution.
For 1 liter of this dyeing solution, the following four types of fluorosurfactants are separately added, and the respective addition amounts are 0.01, 0.02, 0.05, 1.0, 1.05, and 2.0 g. In addition, 24 types of staining solutions were prepared.
(1) Fluorard FC-170C (nonionic, perfluoroalkyl polyoxyethylene ethanol), Sumitomo 3M.
(2) Megafac F-1405 (nonionic, perfluoroalkyl group-containing polyoxyethylene), manufactured by Dainippon Ink & Chemicals, Inc.
(3) Surflon S-131 (amphoteric, perfluoroalkyl betai) Seimi Chemical.
(4) Surflon S-141 (nonionic, perfluoroalkylamine oxide) Seimi Chemical.

(staining)
The dyeing solution to which the fluorosurfactant was added was allowed to stand for 20 minutes while stirring, and then half and gradient dyeing were performed while approximately half of the two plastic lenses were immersed in the dyeing solution for 5 minutes and rocked up and down. .

(Evaluation methods)
The dyeing unevenness of the dyed plastic lens was visually evaluated in the following three stages.
○: Dyeing unevenness cannot be confirmed.
Δ: Slight unevenness and the like can be confirmed slightly, but the appearance is not affected.
X: Dyeing unevenness etc. can be confirmed clearly, affecting the appearance.

[Comparative Example 1]
The following chlorine sulfate surfactants 0.01, 0.02, 0.05, 1.0, 1.05, and 2.0 g were added to the staining solution to obtain six types of staining solutions. For dyeing, the same plastic lens as in the embodiment was used, and half and gradient dyeing were performed in the same manner as in the examples. Evaluation was performed in the same manner as in the examples.
NES-203 (nonionic polyethylene (3) sodium alkyl ether sulfate) manufactured by Nikko Chemicals Corporation.

[Comparative Example 2]
Half and gradient dyeing was performed with the dyeing solution prepared in Comparative Example 1 on a base material of a medium refractive index and a high refractive index, on which no hard coat film and primer layer were formed. Evaluation was performed in the same manner as in the examples.

The evaluation results are shown in Table 1. The dyeing method in which a fluorosurfactant is added to the dyeing solution allows dyeing with little dyeing unevenness, and has been confirmed to be particularly effective for dyeing plastic lenses having a hard coat film.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in the above-described embodiment, half and gradient dyeing are performed, but in the present invention, the entire surface of the plastic lens may be dyed.
The best method for carrying out the present invention has been disclosed in the above description, but the present invention is not limited to this. That is, the present invention has been described primarily with reference to specific embodiments and examples, but may be used for the above-described embodiments and examples without departing from the scope of the technical idea and purpose of the present invention. Various modifications may be made by those skilled in the art in terms of materials to be processed, processing time, concentration, and other details.
Accordingly, the descriptions of the materials, processing times, concentrations, and the like disclosed above are exemplary for ease of understanding of the present invention, and are not intended to limit the present invention. Descriptions excluding some or all of the limitations on materials, processing time, concentration, and the like are included in the present invention.

  The present invention can be used not only for dyeing plastic lenses but also for dyeing other plastic products.

Claims (3)

A plastic lens dyeing method in which a plastic lens is immersed in a dyeing liquid mixed with a plurality of dyes to dye the plastic lens,
A plastic lens dyeing method, wherein 0.02 to 2.0 g of a fluorosurfactant is added to 1 liter of the dyeing solution. In the dyeing method of the plastic lens according to claim 1,
A plastic lens dyeing method comprising adding a carrier agent to the dyeing solution. The plastic lens dyeing method according to claim 1 or 2,
The plastic lens has a coat film that can be dyed,
The method for dyeing a plastic lens, wherein the coating film contains an organosilicon compound.