JPH11305003A - Method for dyeing optical plastic lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and cost effectively dye an optical plastic lens to an arbitrary color tone and concentration levels by using a dyeing liquid which is prepared. by dissolving and/or suspending disperse dye into an organic. sol vent. SOLUTION: A liquid prepared. by dissolving and/or suspending the disperse dyes into the organic solvent is used as the dyeing solution. The organic solvent used for this dyeing solution may consist of a single component or may consist of 2 or more multiple components kinds. The organic solvent is preferably an organic compound having the carrier characteristic of the dyes. Organic compdounds, etc., in which-OH groups,-Cl groups or-NH2 groups are bonded to atom. rings, have superior carrier characteristics. This organic solvent may contain an oligomer as well. The dyeing solution is prepared by dissolving and/or suspending these disperse dyes beforehand in the organic solvent and thereafter, the optical plastic dye is dyed by using such dyeing solution. The lens is preferably heat treated, in order to diffuse the disperse dye in the dyeing liquid into the lens.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved method for dyeing an optical plastic lens and a colored optical plastic lens obtained by the method. More specifically, the present invention provides a method for efficiently and economically dyeing an optical plastic lens, which is difficult to dye with a disperse dye solution containing water as a dispersion medium, at an arbitrary color tone and concentration, and with this method. The present invention relates to colored plastic lenses suitable for use as contact lenses, spectacle lenses, camera lenses, projector lenses, telescope lenses, magnifying lenses, and the like.

[0002]

2. Description of the Related Art In recent years, plastic lenses for optical use have been used in various fields instead of glass lenses. Among them, contact lenses and eyeglass lenses used for correcting vision have a cosmetic effect or a medical effect (for example, from ultraviolet rays). For the purpose of protecting the lens, etc.), the use of colored lenses has been actively performed. The reason why the glass lens is replaced by the plastic lens is that the plastic lens can be reduced in weight and safety (hard to be broken) as well as dyeability.

Various methods have been used for dyeing plastic lenses for optical use. For example, as a method of dyeing a plastic lens for optical use, particularly a plastic lens for spectacles, (1) a method in which a liquid having coloring ability is adhered to a base lens and fixed, and (2) a colored film is attached to the spectacle lens. (3) heating the organic dye in the gas phase to transfer the dye contained in the film
A method of sublimation and coloring (Japanese Patent Publication No. 35-1384) is known.

The above method (1) is a conventional method for coloring spectacle lenses, in which a disperse dye having a coloring ability for an optical plastic lens is dissolved and / or dissolved in water.
Or after heating the suspended dye solution, and immersing the optical plastic lens to be dyed therein for a predetermined time,
This is a method in which the optical plastic lens is heated to stabilize the dye that has penetrated therein by further diffusing into the inside. However, recently, in response to market needs for high added value, the diversification of optical plastic lens materials has progressed, and as a result, materials that are difficult to dye by conventional methods have increased.

[0005] Therefore, methods of increasing the temperature of the dyeing solution as much as possible, adding a dye accelerating agent, a so-called carrier, to the dyeing solution, or extending the time of immersion in the dyeing solution have been used. However, even with these methods, there is a problem in that the attained concentration is limited, it takes a long time to reach the target concentration, and it is not possible to dye at a high concentration even over a long time.

A method of dissolving a dye in a monomer solution of a raw material for an optical plastic lens substrate and polymerizing the dye is conceivable. However, the coloring density of the formed lens depends on the thickness of the lens. However, in a concave lens that is thinner than the peripheral part, the color of the central part becomes lighter, the peripheral part becomes darker, and the color becomes lighter and darker in the entire lens. However, this method is not practical because of the problem that Furthermore, according to market needs,
It is practically impossible to prepare many kinds of colored optical plastic lens substrates by preparing a large number of raw material liquids having different colors and concentrations.

A method of dyeing a coating film applied on a plastic lens material instead of directly dyeing the material (Japanese Patent Laid-Open No. 60-235101) has also been used. The method of coloring the optical plastic lens is a method of applying an organic hard coat solution in which a dye is dissolved on the surface of the optical plastic lens and then performing a curing treatment. The application method includes a dipping method, a spray method, and a spinning ( (Spin coating) method or the like is used. However, also in this method, since it is difficult to contain a large amount of dye in the thin film, the attained concentration is still limited, and dyeing at a high concentration cannot be performed.

On the other hand, the method (2) for transferring a dye is effective if it is a flat plate, but it is difficult to apply a film to a curved optical plastic lens neatly. In practice, it is actually impossible to perform uniform dyeing. Further, in the method of (3), in which the dye is sublimated in the gas phase to be colored, the degree of sublimation of the dye is different for blue, red, and yellow, so that it is difficult to obtain stable color development, It is not a tactical method.

[0009]

SUMMARY OF THE INVENTION Under such circumstances, the present invention efficiently converts an optical plastic lens, which is difficult to dye with a disperse dye solution containing water as a dispersion medium, to an arbitrary color tone and density. It is an object of the present invention to provide an industrial method for economically advantageous dyeing.

[0010]

Means for Solving the Problems The inventors of the present invention have made intensive studies to achieve the above object, and as a result, have used a dyeing solution in which a disperse dye is dissolved and / or suspended in an organic solvent. Finds that the purpose can be achieved by
Based on this finding, the present invention has been completed.

That is, the present invention provides a dye solution obtained by dissolving and / or suspending a disperse dye in an organic solvent.
An object of the present invention is to provide a method for dyeing an optical plastic lens, which comprises dyeing an optical plastic lens. The present invention also provides a colored optical plastic lens dyed by the above method.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In the dyeing method of the present invention, a dye solution in which a disperse dye is dissolved and / or suspended in an organic solvent is used. The organic solvent used in the staining solution may be composed of a single component,
It may be composed of two or more kinds of multi-components. In the present invention, the organic solvent has excellent solubility of the disperse dye, does not dissolve the optical plastic lens to be dyed, does not swell, does not adversely affect the lens characteristics, and has high safety. , Low volatility, environmentally friendly, cheap, etc.
There is no particular limitation, and it can be appropriately selected from various compounds. As such an organic solvent, benzene,
Examples thereof include aromatic hydrocarbons such as toluene and xylene, and particularly preferred are organic compounds having dye carrier properties.

The organic compound having a carrier property used in the present invention is a compound having a property of diffusing into a plastic lens for optics prior to a disperse dye and thereafter displacing the disperse dye. The present inventors have searched for an organic compound having carrier characteristics, and have found that an aromatic ring has a direct -OH group,
It has been found that there are compounds having excellent carrier characteristics, such as organic compounds to which a -Cl group or a -NH ₂ group is bonded.

Examples of the compound having excellent carrier characteristics include, as compounds having an -OH group, methyl salicylate, ethyl salicylate, n-propyl salicylate, salicylic acid, phenyl salicylate, salicyl alcohol, phenol, o-chlorophenol, m-chlorophenol, p-chlorophenol, 2,6-di-t
-Butyl-p-cresol, α, α'-bis (4-hydroxyphenyl) -1,4-diisopropylbenzene and the like as compounds having a -Cl group, chlorobenzene, o-dichlorobenzene, m-dichloro Benzene, p
- dichlorobenzene, 1-chloronaphthalene, and 2-chloronaphthalene, as a compound having a -NH ₂ group, aniline, o- toluidine, m- toluidine, p-
Toluidine, 2,3-toluenediamine, 2,4-toluenediamine, 2,6-toluenediamine, 3,5-toluenediamine, 2,3-xylidine, 2,4-xylidine, 2,5-xylidine and the like. be able to.
These compounds having carrier characteristics may be used alone or in combination of two or more if there is no interaction.

It is desirable to use the organic compound having the carrier characteristics without diluting as much as possible in order to effectively utilize the effect. However, when the compound having the carrier characteristics is solid at room temperature, benzene, toluene , Xylene, methyl salicylate, etc.
It can be used by appropriately dissolving in these solvents. In particular, methyl salicylate is a preferable diluent in that it functions as a compound having carrier characteristics as well as a solvent. Listing the preferred characteristics as a compound having carrier characteristics, it is excellent as a carrier, does not attack the lens surface, has high safety as a chemical,
Examples include high boiling point, liquid at room temperature, low viscosity, good dye solubility, and low cost. In these respects, methyl salicylate, phenyl salicylate, 1-chloronaphthalene, aniline and the like are preferred.

The organic solvent used in the present invention may contain an oligomer. As the oligomer, for example, those which are liquid at ordinary temperature, have relatively low viscosity, and have good dye solubility, for example, polyester oligomers are preferably used. As the polyester-based oligomer, a commercially available polyester-based plasticizer or the like can be used.

The optical plastic lens to which the staining method of the present invention is applied includes, for example, optical lenses used for contact lenses, spectacle lenses, camera lenses, projector lenses, telescope lenses, magnifying lenses, and the like. Visual acuity correcting lenses such as contact lenses and spectacle lenses are suitable. Specifically, diethylene glycol bisallyl carbonate, methyl methacrylate homopolymer, copolymer of methyl methacrylate and one or more other monomers, polycarbonate, polystyrene, polyethylene terephthalate, polyurethane, polythiourethane, and other sulfur-containing polymers And the like.

The dyeing method of the present invention is preferably applied to an optical plastic lens which is difficult to dye with a disperse dye solution containing water as a dispersion medium among the above-mentioned lenses for correcting visual acuity.
Such optical plastic lenses include, for example, methyl methacrylate homopolymer, a copolymer of methyl methacrylate and one or more other monomers, polycarbonate, polystyrene, polyethylene terephthalate,
Plastic lenses made of polyurethane, polythiourethane, other sulfur-containing polymers, and the like can be given.

The dye used in the dyeing method of the present invention is a dye generally called a disperse dye, which is a dye which is hardly soluble in water and which is widely used as a suspension dissolved and / or dispersed in water. Used for dyeing. Since many of them have sublimability, they are sometimes called sublimation dyes or sublimation dyes. Particularly preferred dyes are Dianix Blue AC-E and Dianix Red AC-E manufactured by Dystar Japan Co., Ltd., and Disperse Dye Kayalon Polyester Color Yellow manufactured by Nippon Kayaku Co., Ltd. (Kayal
on PolyesterColors Yellow) 4G-E and Kayaron
Polyester color scarlet (Kayalon Poly)
ester Colors Scarlet) 2RE.

In the present invention, these disperse dyes are
After dissolving and / or suspending in an organic solvent in advance to prepare a staining solution, an optical plastic lens is stained using the staining solution. When the dye is used after being dissolved, the concentration is preferably as high as possible. When used as ink for ink jet recording, it is necessary to completely dissolve the ink to avoid clogging of the ink jet nozzles. However, in other coating methods, the insoluble matter can be used in a suspended state. Even if not completely dissolved, there is no practical problem. The concentration of the dissolved and / or suspended disperse dye in the dyeing solution is selected in the range of usually 0.1 to 20% by weight, preferably 3 to 10% by weight.

The method for adhering the staining solution to the surface of the optical plastic lens is not particularly limited, as long as the method can uniformly and uniformly adhere the staining solution to the surface of the optical plastic lens. For example, a method of directly applying to the lens surface by a method such as brush coating, spin coating, ink jet recording, or the like, or an immersion method, a spray method, or the like can be used. Among these methods, a method of directly applying to the lens surface and an immersion method are preferable. In particular, the application method by ink jet recording is applicable to (1) effective use of ink, (2) a database and an application stored in a computer. Can be applied to the desired color and density based on
(3) It is suitable because it can be applied in a short time.
When the staining solution is applied to the surface of the plastic lens for optics by these methods, it is preferable to perform the staining at room temperature.

The ink-jet recording method is a method in which several kinds of inks are selectively discharged as droplets to perform recording on the surface of a recording object, and the discharge of the ink is controlled by data processing of a computer. Ink used when paper is used as a print medium is basically a dye or pigment ink using water as a dispersion medium.In the present invention, as described above, an ink in which a disperse dye is dissolved in an organic solvent, particularly an -OH group is used. An organic solvent including a compound having excellent carrier characteristics such as a compound having a compound, a compound having a -Cl group, a compound having a -NH ₂ group, or an organic solvent including a mixture of these compounds and another organic solvent was used. Use ink.

When the ink is applied to the surface of the optical plastic lens by the ink jet recording method, the surface of the optical plastic lens and the ejection direction of the ink jet nozzle are adjusted so that the ink droplets hit the surface of the optical plastic lens at right angles. Is preferably adjusted so that data controlled by the computer is faithfully reproduced on the surface of the optical plastic lens. For such adjustment, an optical lens coloring system described in Japanese Patent Application No. 10-024201 can be used.

In the present invention, the optical plastic lens having the dyeing solution adhered to the surface by the dipping method or the direct coating method in this way allows the disperse dye in the dyeing solution to diffuse inside the lens. Therefore, it is desirable to perform a heat treatment. In particular, when an organic solvent containing an organic compound having carrier characteristics is used, the organic compound having carrier characteristics diffuses into the plastic lens for optics prior to the disperse dye, and is subsequently replaced with the disperse dye. It is advantageous to carry out a heat treatment in order to effectively diffuse the carrier into the optical plastic lens in time, displace the subsequent disperse dye and further diffuse the disperse dye into the optical plastic lens. The heating temperature at this time is usually 100 to 200 ° C, preferably 120 to 150 ° C.
It is selected in the range of ° C. The heating time depends on the heating temperature and the like, and cannot be determined unconditionally, but is usually in the range of 10 minutes to 24 hours, preferably 30 minutes to 6 hours. The heating temperature and the heating time are determined in consideration of the balance between the characteristics of the lens and the dyeing property so that the surface shape of the optical plastic lens is not adversely affected such as deformation or yellowing. It is desirable to select the optimum value for each case.

The heating furnace used for this heat treatment includes:
Any device can be used as long as it can uniformly heat the plastic lens for optics, and is not particularly limited. For example, an electric furnace, a hot-air circulating furnace, an infrared oven, or the like can be used. It is preferable to use a hot air circulating furnace in which safe measures are taken against vapors of organic compounds such as carriers.

After the heating is completed, the organic plastic lens and the disperse dye which could not be diffused into the interior remain on the surface of the optical plastic lens. To remove them, a washing treatment or a wiping treatment is performed. Will be In this case, in order to efficiently clean a large number of optical plastic lenses in a short time, it is better to perform ultrasonic cleaning in an organic solvent, but the solvent used is dispersed inside and fixed by the disperse dye. It is not preferable to use a solvent having a high solubility in a disperse dye, which would cause the extraction of a solvent, and it is preferable to use a solvent such as ethyl alcohol, isopropyl alcohol, or acetone. Solvents stained by dissolution or suspension of disperse dyes and organic solvents are usually recovered by distillation and reused.

The present invention also provides a colored optical plastic lens dyed by the above method. The plastic lens for coloring optics is suitably used, for example, as a contact lens, an eyeglass lens, a camera lens, a projector lens, a telescope lens, a magnifying lens, and the like.

[0028]

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

Example 1 (1) Preparation of Disperse Dye Liquid 8 parts by weight of a disperse dye Dianix Blue AC-E manufactured by Dystar Japan Co., Ltd. were added to 92 parts by weight of o-xylene, and the mixture was heated at 50 ° C. The mixture was stirred for 30 minutes to prepare a liquid in which the disperse dye was partially suspended.

(2) Coloring of plastic lens for optics A flat lens (thickness: 2 mm) made of diethylene glycol bisallyl carbonate is immersed in the disperse dye solution obtained in the above (1) at room temperature, and then dyed on both surfaces. Was heated in an oven at 120 ° C. for 30 minutes. After cooling, the mixture was taken out, the dispersion medium on the surface and the remaining disperse dye were wiped off with a paper impregnated with acetone, and the dyeing density was measured using a spectrophotometer at a light transmittance of 400 nanometers. As a result of comparison with the untreated flat lens, the staining density of the flat lens was 25%.

Comparative Example 1 The same type of optical diethylene glycol bisallyl carbonate lens used in Example 1 was used as a carrier in a solution prepared by dissolving 5 parts by weight of sodium salt of o-phenylphenol in 100 parts by weight of water. It was immersed at 80 ° C. for 1 hour. Using 100 parts by weight of water, Dianix Blue A manufactured by Dystar Japan Co., Ltd.
8 parts by weight of CE and 1 part by weight of a stabilizer were mixed, immersed in a liquid heated to 80 ° C. for 1 hour, taken out, and wiped with a paper impregnated with benzene. The result of measuring the staining concentration in the same manner as in Example 1 was 5%. The time required for the treatment was 2 hours in total and 4 times that of Example 1, but the staining density was 1/5.

Example 2 (1) Preparation of Disperse Dye Solution 10 parts by weight of Disperse Dye Dyanix Thread (Dianix Red) AC-E manufactured by Dystar Japan Co., Ltd. was mixed with a polyester oligomer (trade name: Asahi Denka Kogyo KK) (Adekasizer PN-170) (90 parts by weight) and stirred at 50 ° C. for 30 minutes to prepare a disperse dye solution.

(2) Coloring of plastic lens for optics The disperse dye solution obtained in the above (1) is applied to a concave surface of a polycarbonate concave lens (degree: -3.00, diopter, center thickness 1.5 mm, outer diameter 70 mm). First stage 8
00 rpm / 15 seconds, 2nd stage 3000 rpm / 3
Spin coating was performed under the condition of 0 seconds. The concave lens with the disperse dye solution attached to the concave surface was heated in an oven at 150 ° C. for 30 minutes. After cooling, it was taken out, and the dispersing medium and the remaining disperse dye on the surface were wiped off with paper impregnated with isopropyl alcohol. Next, the convex surface was spin-coated in the same manner as the concave surface, and heat-treated under the same conditions as the concave surface. After wiping off the dispersing medium and the remaining disperse dye on the surface in the same manner as the concave surface, the dyeing density near the center was measured using a spectrophotometer at a light transmittance of 700 nanometers. As a result of comparison with the untreated flat lens, the staining density of the flat lens was 28%.

Comparative Example 2 A polycarbonate lens of the same kind used in Example 2 was used in an amount of 100 parts by weight of water, and a disperse dye Dianix Red AC-E1 manufactured by Dystar Japan Co., Ltd.
0 parts by weight and 1 part by weight of a stabilizer were mixed, immersed in a liquid heated to 90 ° C. for 1 hour, taken out, and wiped with a paper impregnated with isopropyl alcohol. The result of measuring the staining concentration in the same manner as in Example 2 was 0 to 1%, and almost no staining was possible. The time required for the treatment was one hour, the same as in Example 2, but the concentration was less than 1/28.

A polycarbonate lens of the same type as used in Example 2 was immersed in a solution of 5 parts by weight of o-phenylphenol as a carrier in 100 parts by weight of water at 50 ° C. for 1 hour. The lens surface was attacked and the transparency was reduced. Therefore, the pretreatment by the carrier was stopped.

Example 3 (1) Preparation of Ink for Inkjet Recording Disperse dye Kayalon Polyester Color Yellow manufactured by Nippon Kayaku Co., Ltd.
ow) 10 parts by weight of 4G-E was added to a mixture of 50 parts by weight of phenyl salicylate / 40 parts by weight of methyl salicylate to give 6 parts by weight.
Stirred at 0 ° C. for 30 minutes. After cooling to room temperature, a small amount of insoluble matter was removed by suction filtration using Whatman filter paper No. 3 to prepare an ink jet recording ink.

(2) Coloring of plastic lens for optics Using the ink obtained in the above (1), HOYA Corporation
Was recorded on one side of a base lens (flat lens having a thickness of 2 mm and an outer diameter of 80 mm) of a polythiourethane-based lens (trade name: IAS) at a pitch of 128 dpi by an inkjet printer. The optical polythiourethane-based lens to which the ink was attached was heated in an oven at 125 ° C. for 30 minutes. After cooling, the ink was taken out, the solvent on the surface and the remaining disperse dye were wiped off with a paper impregnated with acetone, and then the ink was adhered to the opposite surface in the same manner and heated under the same conditions. After wiping off the solvent and the remaining disperse dye on the surface as in the case of the concave surface, the dyeing density near the center was measured by using a spectrophotometer at a light transmittance of 550 nanometers. As a result, it was 30%.

Comparative Example 3 5 parts by weight of o-phenylphenol was added as a carrier to 10 parts by weight.
In a solution dissolved in 0 parts by weight of water, the same kind of optical polythiourethane lens used in Example 3 was used at 90 ° C. for 1 hour.
Soaked for hours. Using 100 parts by weight of water, Nippon Kayaku Co., Ltd. disperse dye Kayalon polyester color
Yellow (Kayalon Polyester Colors Yellow) 4
10 parts by weight of GE and 1 part by weight of a stabilizer were mixed, immersed in a liquid heated to 95 ° C. for 2 hours, taken out, and wiped with a paper impregnated with acetone. As a result of measuring the concentration in the same manner as in Example 3, the result was 5%. The time required for the treatment was 3 hours, which was three times longer than that in Example 3, but the concentration was 1/6.

Example 4 (1) Preparation of Disperse Dye Solution 10 parts by weight of a disperse dye Dianix Blue AC-E manufactured by Dystar Japan Co., Ltd. were added to 90 parts by weight of 1-chloronaphthalene, and 50 parts by weight were added. The mixture was stirred at 30 ° C. for 30 minutes to prepare a liquid in which a disperse dye was partially suspended.

(2) Coloring of plastic lens for optics A base lens of a polythiourethane-based lens (trade name: IAS) of HOYA CORPORATION (power: -2.00 diopter, center thickness: 1.5 mm, outer diameter: 80 mm) After the concave lens was immersed in the disperse dye solution obtained in the above (1) at room temperature, the concave lens having the disperse dye solution adhered to both surfaces was heated in an oven at 125 ° C. for 30 minutes.

After cooling, the resin was taken out, the dispersion medium on the surface and the remaining disperse dye were wiped off with a paper impregnated with acetone, and the dyeing density near the center was determined using a spectrophotometer with a light transmittance of 400 nanometers. It was measured. As a result of comparison with the untreated concave lens, the staining density of the concave lens is 30%.
Met.

Comparative Example 4 5 parts by weight of o-phenylphenol was added as a carrier to 10 parts by weight.
In a solution dissolved in 0 parts by weight of water, the same kind of optical polythiourethane lens used in Example 3 was used at 90 ° C. for 1 hour.
Soaked for hours. The lens was mixed with 100 parts by weight of water, 10 parts by weight of a disperse dye Dianix Blue AC-E manufactured by Dystar Japan, and 1 part by weight of a stabilizer, and heated to 95 ° C. After immersion for 4 hours, it was taken out and the surface was wiped off with a paper impregnated with acetone. The concentration was measured to be 10%, and the time required for the treatment was 5 hours, which was 10 times that of Example 4, but the concentration was 3%.
It was one in one.

Example 5 (1) Preparation of Disperse Dye Solution 10 parts by weight of a disperse dye, Dianix Red AC-E manufactured by Dystar Japan Co., Ltd. were added to 90 parts by weight of m-toluidine, and 50 ° C. For 30 minutes to prepare a liquid in which the disperse dye is partially suspended.

(2) Coloring of plastic lens for optics Base lens of sulfur-containing plastic lens (trade name: Teslalid) of HOYA CORPORATION (power: 1.00 diopter, center thickness 2.5 mm, convex lens 75 mm in outer diameter) Is immersed in the disperse dye solution obtained in the above (1) at room temperature,
The convex lens having the disperse dye solution attached to both surfaces was heated in an oven at 125 ° C. for 30 minutes.

After cooling, the mixture was taken out, the dispersion medium on the surface and the remaining disperse dye were wiped off with acetone-soaked paper, and the dyeing density near the center was determined using a spectrophotometer with a light transmittance of 700 nanometers. It was measured. As a result of comparison with the untreated convex lens, the staining density of the convex lens was 20%.
Met.

Comparative Example 5 As a carrier, 5 parts by weight of o-phenylphenol was added to 10 parts by weight.
The same type of sulfur-containing plastic lens used in Example 5 was immersed in a solution dissolved in 0 parts by weight of water at 90 ° C. for 1 hour. Using 100 parts by weight of water, a disperse dye dianetic thread (Diastar Japan Co., Ltd.)
nix Red) 10 parts by weight of AC-E and 1 part by weight of a stabilizer were mixed, immersed in a mixture heated to 95 ° C. for 3 hours, taken out, and wiped with acetone-soaked paper. As a result of measuring the concentration, it was 2%. The time required for the treatment was 4 hours in total, which was 8 times that of Example 5, but the concentration was 1/10.

[0047]

According to the present invention, an optical plastic lens, which is difficult to dye particularly with a disperse dye solution containing water as a dispersion medium, can be dyed efficiently and economically at an arbitrary color tone and density.

The colored optical plastic lens dyed by the method of the present invention is suitably used, for example, as a contact lens, a spectacle lens, a camera lens, a projector lens, a telescope lens, a magnifying lens, and the like.

Claims (9)

[Claims] 1. A method for dyeing an optical plastic lens, comprising dyeing an optical plastic lens with a dye solution obtained by dissolving and / or suspending a disperse dye in an organic solvent. 2. The method according to claim 1, wherein the organic solvent is an oligomer alone or a mixture thereof with another organic solvent. 3. The method according to claim 1, wherein the organic solvent contains an organic compound having carrier characteristics. 4. The organic compound having carrier characteristics is at least one selected from organic compounds in which an —OH group, —NH ₂ group, or —Cl group is directly bonded to an aromatic ring. the method of. 5. The method according to claim 1, wherein the plastic lens for optical use is immersed in the dyeing solution, and then heated to diffuse the disperse dye into the plastic lens for optical use. 6. The method according to claim 1, wherein the dyeing solution is applied to the surface of the optical plastic lens and then heated to diffuse the disperse dye into the optical plastic lens. 7. The method according to claim 6, wherein the dyeing liquid is used as an ink for ink jet recording, and is applied to the surface of an optical plastic lens. 8. An optical plastic lens which is difficult to dye with a disperse dye liquid containing water as a dispersion medium.
8. The method according to any one of items 7 to 7. 9. A colored optical plastic lens dyed by the method according to claim 1. Description: