JP2005156631A - Method for dyeing plastic lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for uniformly dyeing a plastic lens by a sublimating dye. <P>SOLUTION: In the method for dyeing the plastic lens by heating a holding material for dyeing containing a sublimating dye by a member for heating to sublimate the sublimating dye, the surface on the plastic lens side of the holding material for dyeing is provided with a curved surface nearly complementary to the surface to be dyed of the plastic lens and the holding material for dyeing is arranged between the plastic lens and the member for heating and the curved surface of the holding material for dyeing and the surface to be dyed of the plastic lens are opposed apart a prescribed spacing disposed therebetween. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for dyeing a plastic lens that can be uniformly and uniformly dyed with a sublimation dye.

  In recent years, plastic lenses have been used in many fields instead of glass lenses, but contact lenses and eyeglass lenses used for correcting vision are often used for dyeing lenses for purposes such as cosmetic effects. Yes. As a reason why the glass lens is replaced with a plastic lens, in addition to the light weight and safety of the plastic lens, easy dyeing that can be easily dyed can be mentioned.

  Various methods have been implemented so far for dyeing plastic lenses. For example, as a method of uniformly dyeing plastic lenses, particularly plastic lenses for spectacles, mainly (i) a method of immersing in a disperse dye solution, (ii) a method of applying a coating agent containing a disperse dye or a dyeable coating agent (Iii) a method of polymerizing a raw material monomer of a plastic lens in the presence of a disperse dye, and (iv) a method of sublimating by heating a sublimable dye.

  In the first method, the lens is immersed in a heated disperse dye bath, and then the lens is heated to fix the dye. However, recently, as a result of the diversification of plastic lens materials in response to market needs for high added value, there are an increasing number of materials that are difficult to dye using such disperse dyes.

  The second method is not to dye the plastic lens material directly, but to apply the organic hard coat liquid in which the disperse dye is dispersed or dissolved to the plastic lens, and then to cure the lens so that the dyed hard coat thin film becomes a lens. A method of forming on the surface (JP-A-6-347606) has also been proposed. The organic hard coat liquid is applied by a dipping method, a spray method, a spin coating method, or the like. Instead of applying an organic hard coat solution containing a dye to the plastic lens, a hard coat capable of being dyed is formed on the surface of the plastic lens, and then the plastic lens is immersed in a disperse dye bath and heated for dyeing. A method (Japanese Patent Laid-Open No. 2000-266905) is also performed. However, these methods are also difficult to contain a large amount of dye in the hard coat thin film, so that there is a limit to the reached density, and the lens cannot be dyed at a high density.

  As a third method, a method in which a disperse dye is previously dissolved in a raw material monomer for a plastic lens and then polymerized (Japanese Patent Laid-Open No. 7-018586) has been proposed. However, with this method, the color density of the formed lens depends on the thickness of the lens.For example, in a concave lens where the center of the lens is thinner than the periphery, the color at the center becomes lighter and the color density of the entire lens is reduced. Occurs. In the case of spectacle lenses having different powers on the left and right, there arises a problem that the color density differs on the left and right. In addition, this method of dyeing at the time of polymerization requires a wide variety of stocks due to diversification of commodities, and it is difficult to respond quickly when trying to manufacture at the time of order to avoid this. Thus, this method is not practical.

  As a fourth method, a method of dyeing by heating and sublimating a sublimable dye has been proposed. This method has an advantage that a lens, which is difficult to be dyed by a conventional immersion method, can be easily dyed. As this sublimation dyeing method, for example, (a) a method of dyeing a plastic lens by sublimating a solid sublimable dye (Japanese Patent Laid-Open Nos. 56-153321 and 56-159376), (b) including a sublimable dye A method in which a substrate formed by applying a solution is opposed to a plastic lens in a non-contact state and is dyed by heating the substrate and the lens (for example, JP-A Nos. 1-277814 and 2000-329901 (Patent Documents 1 and 2)), (c) A method of dyeing by transferring a transfer layer composed of a colored layer containing a sublimable dye and an adhesive layer to a plastic lens and then heating (for example, JP-A-2000-009905 ( Patent Document 3)) has been proposed.

  However, in the method (a), it is difficult to quantitatively attach the solid sublimable dye to the lens, and it is difficult to uniformly heat the coloring source and adjust the dye concentration. In the method (b), it is easier to uniformly heat the coloring source than in the method (b) above, but when the substrate is heated with a certain distance between the substrate and the lens, the sublimation dye diffuses due to heating unevenness. It becomes difficult to dye the lens uniformly. In the method (c), the dyed lens is dyed through the pressure-sensitive adhesive layer between the colored layer and the plastic lens, so that the dyed lens cannot be dyed at a high density. In addition, these dyeing methods for plastic lenses have a problem that efficiency is poor because only one type of pattern can be dyed at a time.

  Japanese Patent No. 3229291 (Patent Document 4) and Japanese Patent Application Laid-Open No. 2001-66401 (Patent Document 5) have a color layer containing a sublimation dye having a size equal to or larger than the portion of the lens to be colored, In addition, a coloring method is disclosed in which a heating member is brought into contact with the entire colored layer corresponding to the portion of the lens to be colored and heated. However, if the heating member is brought into contact with the entire colored layer corresponding to the portion to be colored and heated, the heat from the heating member is directly transferred to the colored layer, resulting in inhomogeneous heating and uneven dyeing. There's a problem.

Japanese Unexamined Patent Publication No. 1-277814 JP 2000-329901 A JP 2000-009905 A Japanese Patent No. 3229291 JP 2001-66401 A

  Accordingly, an object of the present invention is to provide a method for dyeing a plastic lens that can be uniformly and uniformly dyed with a sublimation dye.

  As a result of diligent research in view of the above object, the present inventors have used a heating member to heat a dye-holding material containing a sublimable dye, sublimate the sublimable dye, and dye a plastic lens. By providing a curved surface substantially complementary to the surface to be stained of the plastic lens on the surface of the holding material on the plastic lens side, and making the curved surface of the staining holding material and the surface to be stained of the plastic lens face each other with a predetermined interval The present inventors have found that the dye that has been sublimated can be uniformly diffused on the lens and the plastic lens can be uniformly dyed without unevenness, and the present invention has been conceived.

  That is, the dyeing holding material containing a sublimable dye is heated by a heating member, and the dyeing method for a plastic lens of the present invention for dyeing a plastic lens by sublimating the sublimable dye comprises: The plastic lens side surface is provided with a curved surface substantially complementary to the surface to be stained of the plastic lens, the dyeing holding material is disposed between the plastic lens and the heating member, and the dyeing holding The curved surface of the material and the stained surface of the plastic lens are opposed to each other with a predetermined interval.

  It is preferable to provide at least one heating buffer layer between the dyeing holding material and the heating member. The heating buffer layer preferably has a gas layer or a vacuum layer. You may provide the said gas layer or a vacuum layer by forming a some hole in the surface which contact | connects the heating member of the said dyeing | holding material. The gas layer or the vacuum layer is formed in an area having a size equal to or larger than the surface to be dyed of the plastic lens, the center of the area where the gas layer or the vacuum layer is formed, the sublimation of the dyeing holding material. It is preferable to arrange the heating buffer layer, the dyeing holding material, and the plastic lens so that the center of the portion to which the dye is applied and the center of the dyed surface of the plastic lens are substantially coaxial.

  In the method for dyeing a plastic lens of the present invention, a curved surface almost complementary to the surface to be dyed of the plastic lens is provided on the surface of the dyeing holding material on the plastic lens side, so that sublimation and diffusion of the sublimable dye becomes uniform. It is possible to dye plastic lenses uniformly and without unevenness. Furthermore, by providing a heating buffer layer between the dyeing holding material and the heating member, uneven heating of the dyeing holding material can be reduced, and the plastic lens can be dyed more uniformly and without unevenness.

[1] Material of plastic lens The material of the plastic lens to which the dyeing method of the present invention is applied is not particularly limited. Examples of applicable materials include methyl methacrylate homopolymer, copolymer of methyl methacrylate and one or more other monomers, diethylene glycol bisallyl carbonate homopolymer, diethylene glycol bisallyl carbonate and one or more other monomers. Copolymer, acrylonitrile-styrene copolymer, sulfur-containing copolymer, halogen-containing copolymer, polycarbonate, polystyrene, polyvinyl chloride, unsaturated polyester, polyethylene terephthalate, polyurethane, polythiourethane, epoxy resin, etc. Can be mentioned.

  The shape of the plastic lens to which the dyeing method of the present invention is applied is not particularly limited. The present invention can be applied to plastic lenses having various curved surfaces such as spherical surfaces, rotationally symmetric aspheric surfaces, multifocal lenses, aspheric surfaces such as toric surfaces, convex surfaces, and concave surfaces.

[2] Dye The sublimable dye is not particularly limited as long as it has a property of sublimation by heating. Examples of sublimation dyes include Kayaset Blue N (manufactured by Nippon Kayaku Co., Ltd.), Sumikaron Yellow EG (manufactured by Sumitomo Chemical Co., Ltd.), Kayaset Blue 906 (manufactured by Nippon Kayaku Co., Ltd.), Kayaset Brown 939 (manufactured by Nippon Kayaku Co., Ltd.), Kayaset Red 130 (manufactured by Nippon Kayaku Co., Ltd.), Delacil Blue 3RL (manufactured by Nippon Ciba Geigy Co., Ltd.), Delacil Brown (manufactured by Ciba Geigy Japan Co., Ltd.) , PS Yellow GG (Mitsui Chemicals), Dianix Red TA-N (Mitsubishi Chemical), Kayalon Microester Red C-LS conc (Nippon Kayaku), Kayalon Microester Red AQ-LE (Nippon Kayaku Co., Ltd.), Miketon Fast Red Z (Mitsui Chemicals Co., Ltd.), Kayalon Microester Red DX-LS (Nippon Kayaku Co., Ltd.), Dianix Blue UN-SE (Mitsubishi Chemical Corporation) ), Disperse Fast Blue Z (Mitsui Chemicals), Dianix / Samaron Navy Blue TA-N (Mitsubishi Chemical), Kayalon Mic roester Blue C-LS conc (Nippon Kayaku Co., Ltd.), Kayalon Microester Blue AQ-LE (Nippon Kayaku Co., Ltd.), Kayalon Microester Blue DX-LS conc (Nippon Kayaku Co., Ltd.), Dianix / Samaron Orange TA-N (Mitsubishi Chemical Corporation), Dianix Yellow TA-N (Mitsubishi Chemical Corporation), Kayalon Microester Yellow AQ-LE (Nippon Kayaku Co., Ltd.), Kayalon Microester Yellow DX- LS conc (Nippon Kayaku Co., Ltd.), Miketon Fast Yellow Z (Mitsui Chemicals Co., Ltd.), Kalonon Microester Yellow C-LS (Nippon Kayaku Co., Ltd.), Lurafix Blue 660 (BASF, JAPAN ( Co., Ltd.), LuraFix Red 420 (BASF, JAPAN Co., Ltd.) and the like.

[3] Plastic lens dyeing method
(1) Production of dyeing holding material A dyeing holding material containing a sublimable dye is produced as an intermediate medium for dyeing plastic lenses. The material for the dyeing holding material may be any of an organic material, a metal material, and an inorganic material. Examples of the holding material for dyeing made of an organic material include paper making made of synthetic fiber or natural fiber, woven or non-woven fabric, sheet made of rubber or thermoplastic elastomer, polymer film, and the like. Examples of the rubber include natural rubber and synthetic rubber such as silicone rubber, neoprene rubber, fluoro rubber, EPM (ethylene-propylene copolymer), EPDM (ethylene-propylene-diene copolymer). Examples of the thermoplastic elastomer include polystyrene-based, olefin-based, urethane-based, ester-based, and amide-based thermoplastic elastomers. Polymer films include cellulose polymer films such as TAC (triacetyl cellulose), ester polymer films such as PET (polyethylene terephthalate) and PEN (polyethylene naphthalate), and fluorine such as PTFE (polytrifluoroethylene). Examples thereof include a polymer film, a polyimide film, and a silicone polymer film. Examples of the dyeing holding material made of a metal material include plates, sheets, and the like made of aluminum, stainless steel, copper, and alloys thereof. Examples of the dyeing holding material made of an inorganic material include a plate made of glass, quartz, mica, or the like, a woven fabric or a non-woven fabric made of an inorganic polymer compound such as glass fiber or silicon carbide fiber. The dyeing holding material may be formed of a composite material obtained by combining two or more of the above materials, or may be a multilayer structure made of a plurality of materials.

  In the present invention, a curved surface substantially complementary to the surface to be stained (curved surface) of the plastic lens is provided on the surface of the dyeing holding material on the plastic lens side. As a result, when the curved surface of the dyeing holding material and the surface to be dyed of the plastic lens face each other, the distance between the dyeing holding material and the plastic lens becomes almost constant over the entire curved surface of the lens, and the sublimated dye is placed on the lens. It can diffuse evenly and dye plastic lenses uniformly and without unevenness. The curved surface substantially complementary to the surface to be stained of the plastic lens means that the error is small when the lens surface is superimposed on the curved surface provided on the staining holding material. Specifically, the error is preferably 2 mm or less, and more preferably 1 mm or less. It is preferable that the curved surface provided on the dyeing holding material has a size equal to or larger than the size of the plastic lens.

(2) Application of sublimation dye As a method of applying a sublimation dye to the dyeing holding material, (a) a method of immersing in a coating liquid containing a sublimation dye, (b) a coating liquid containing a sublimation dye. (C) a method of printing with an ink jet printer or the like, (c) a method of applying, spraying or transferring a coating liquid containing a sublimation dye, (d) a method of kneading the sublimation dye into a resin and forming a sheet, and (e) a sublimation dye. And a method of polymerizing monomers in the presence of. In particular, it is preferable to apply a sublimable dye to the dyeing holding material by dipping, printing or coating. In that case, it may be applied to the entire dyeing holding material by dipping, or may be applied to the curved surface of the dyeing holding material by printing or coating. The application method may be a known method. For example, a curtain coating method, an extrusion coating method, a roll coating method, a spin coating method, a bar coating method, a spray coating method, a slide coating method, or the like can be used. The method for preparing the coating liquid is not particularly limited, and for example, it can be prepared by dispersing a sublimation dye in an aqueous medium. An organic solvent, a viscosity adjusting agent, a pH adjusting agent, a surfactant and the like may be added to the aqueous medium. Moreover, you may add binders (water-soluble acrylic resin etc.) etc. to a coating liquid.

  When printing by the inkjet method, a commercially available inkjet printer can be used. As ink for an ink jet printer, inks of a plurality of colors such as magenta, yellow, and cyan can be used. You may comprise so that multicolor printing can be performed by adjusting the discharge amount, discharge ratio, etc. of these multiple color inks. Further, gradation expression (gradation) may be made possible by gradually changing the ink discharge amount or discharge ratio with time.

  The ink for an inkjet printer preferably contains 0.1 to 30% by mass, more preferably 0.5 to 15% by mass of a sublimable dye in the ink medium. The sublimable dye is preferably a sublimable disperse dye. Each ink is stored in an ink cartridge and mounted on an ink jet printer.

  The ink jet printer preferably includes a control unit. Information such as the print pattern and the ejection amount of each ink is input in advance to the control unit, and a print signal is sent from the control unit to the recording head based on the input information. The ink discharge amount from the recording head is adjusted based on the print signal, and a desired pattern is printed on the dyeing holding material.

  The size of the portion to which the sublimable dye is applied is preferably equal to or greater than the size of the surface to be dyed of the plastic lens. When the entire surface of the plastic lens is dyed with a sublimable dye, the diameter of the portion provided with the sublimable dye is preferably equal to or greater than the diameter of the lens. By setting the size of the portion to which the sublimable dye is applied to be equal to or greater than the size of the surface to be dyed of the lens, the surface to be dyed of the plastic lens can be uniformly dyed.

(3) Production of Heat Buffer Layer In the method for dyeing a plastic lens of the present invention, it is preferable to provide at least one heat buffer layer between the dyeing holding material and the heating member. By providing the heating buffer layer, when the dyeing holding material is heated by the heating member, the heat from the heating member is uniformly transmitted to the dyeing holding material, and heating unevenness is greatly generated in the dyeing holding material. Can be reduced. The heating buffer layer may be a single layer or a laminate of two or more layers. The heating buffer layer may be formed on the entire surface between the dyeing holding material and the heating member or may be formed on a part between the dyeing holding material and the heating member.

  In order to dye the plastic lens uniformly and uniformly, it is preferable to form the heating buffer layer with a size equal to or larger than the size of the surface to be dyed of the plastic lens. For example, the diameter of the heating buffer layer (the length in the short direction when the heating buffer layer is other than circular) is preferably formed to be equal to or greater than the diameter of the lens. The heating buffer layer may be attached as an independent structure between the dyeing holding material and the heating member, or may be integrated with the dyeing holding material or the heating member. The thickness of the heating buffer layer is preferably 100 μm to 10 mm, more preferably 1 mm to 5 mm. If the thickness is less than 100 μm, it is difficult to heat the dyeing holding material uniformly, and if it is thicker than 10 mm, the heating takes time and the dyeing efficiency decreases.

The heating buffer layer preferably has a gas layer (air layer, nitrogen layer, etc.) or a vacuum layer, and particularly preferably has an air layer or a vacuum layer. The vacuum layer means a layer having a pressure in the pores of 1 × 10 ⁻² Pa or less. The gas layer or the vacuum layer may be provided, for example, by forming holes in a part of the heating buffer layer, or one or a plurality of the layers on the surfaces of the dyeing holding material 2 and / or the heating member 3 that are in contact with each other. You may provide by forming a hole.

  The gas layer or vacuum layer 5a is preferably formed in a region having a size equal to or larger than the size of the surface to be stained of the plastic lens 1. The region having a size equal to or larger than the size of the surface to be stained of the plastic lens 1 is the diameter of the region containing the gas layer or the vacuum layer 5a (the length in the short direction of the region if the region is other than a circle). Means that it is equal to or larger than the diameter of the plastic lens 1. In that case, the entire region may be a gas layer or a vacuum layer 5a, or a plurality of holes may be formed in the region to provide the gas layer or the vacuum layer 5a. For example, as shown in FIGS. 1 and 2, a heating buffer layer 5 having a gas layer or a vacuum layer 5a having a size equal to or larger than the surface to be stained of the plastic lens 1 may be provided. The gas layer 5 a is preferably in contact with the dyeing holding material 2, and more preferably, the through hole is formed in the heating buffer layer 5 and in contact with both the dyeing holding material 2 and the heating member 3. Further, as shown in FIG. 4, a gas layer is formed by forming a plurality of holes in a region having a size equal to or larger than the surface to be dyed of the plastic lens 1 on the surface of the dyeing holding material 2 in contact with the heating member 3. Or you may provide the heating buffer layer 5 which consists of the vacuum layer 5a.

  Even if the heating buffer layer 5 made of a gas layer or a vacuum layer is formed between the dyeing holding material 2 and the heating member 3 by roughening the interface between the dyeing holding material 2 and the heating member 3. Good. In that case, the surface of the dyeing holding material may be roughened, the surface of the heating member may be roughened, or both surfaces may be roughened. The surface roughness (Ra) due to roughening is preferably 100 μm or more, more preferably 100 to 1000 μm, and even more preferably 300 to 500 μm. If it is less than 100 μm, the dyeing holding material cannot be heated uniformly, and if it exceeds 1000 μm, it becomes structurally brittle. The surface roughness (Ra) means an arithmetic average roughness defined by JIS B 0601-1994.

  As shown in FIG. 3, the heating buffer layer 5 may be a network structure. The network structure has a three-dimensional network structure composed of a skeleton and voids (gas layer or vacuum layer). As a material constituting the skeleton, a metal (copper, iron, aluminum, etc.), an inorganic material (ceramics, glass, etc.), an organic material (organic polymer compound, etc.), or a composite material thereof can be used. The network structure may be regular or irregular. For example, a network structure may be formed by crossing or connecting a plurality of linear metals or the like in a lattice pattern, or a plurality of linear metals or the like may be irregularly entangled with each other to form a network structure. Also good. Further, a network structure may be formed by using an inorganic material or an organic material with a sponge-like porous structure. Not limited to the example shown in FIG. 3, the heating buffer layer 5 may have a network structure in a part thereof, or may be a laminate in which a plurality of network structures having different materials or shapes are stacked. Good.

  When the heating buffer layer 5 has a gas layer or a vacuum layer other than the air layer, the heating buffer layer 5 can be formed in the same manner as when the heating buffer layer 5 has an air layer. For example, in the case of a gas layer other than the air layer, after forming the air layer, the air may be replaced with a target gas. In the case of a vacuum layer, the air in the air layer may be exhausted with a vacuum pump or the like.

  The heating buffer layer 5 may have a layer made of an inorganic material (alumina, zirconia, silicon dioxide, etc.) or an organic material (polyimide, organosilicon compound, epoxy resin, phenol resin, etc.). In that case, for example, instead of the gas layer or the vacuum layer 5a, these inorganic material or organic material may be filled in the holes of the heating buffer layer. Effects similar to those of the gas layer or the vacuum layer 5a can also be obtained by these inorganic materials or organic materials.

(4) Heat treatment The dyeing holding material 2 containing a sublimable dye is subjected to a heat treatment by the heating member 3, and the plastic lens is dyed by sublimating the sublimable dye. At that time, a curved surface substantially complementary to the surface to be dyed of the plastic lens is provided on the surface of the dyeing holding material 2 on the plastic lens side, and the dyeing holding material 2 is placed between the plastic lens 1 and the heating member 3. It arrange | positions and heat-processes by making the said curved surface of the dyeing | holding material 2 and the to-be-dyed surface of the plastic lens 1 face each other at a predetermined interval. In order to reduce heating unevenness of the dyeing holding material 2, a heating buffer layer 5 is preferably provided between the dyeing holding material 2 and the heating member 3. The interval between the dyeing holding material 2 and the plastic lens 1 is preferably 1 to 30 mm, and more preferably 3 to 10 mm. If the interval is narrower than 1 mm, the optical characteristics of the plastic lens 1 may be impaired by the heat of the heating member 3, and the dye is not diffused uniformly and uneven dyeing tends to occur. If the interval is larger than 30 mm, the dye sublimated diffuses and the dyeing density of the plastic lens 1 is lowered.

  In order to dye the plastic lens 1 uniformly, as shown in FIG. 6, the center of the plastic lens 1, the center of the portion 12 to which the sublimation dye of the dyeing holding material 2 is applied, and the center of the heating buffer layer 5 are almost the same. It is preferable to arrange the plastic lens 1, the dyeing holding material 2 and the heating buffer layer 5 so as to be coaxial. When the heating buffer layer 5 has a gas layer or a vacuum layer 5a, the center of the gas layer or the vacuum layer 5a is substantially coaxial with the center of the plastic lens 1 and the center of the portion 12 to which the sublimation dye of the dyeing holding material 2 is applied. It is preferable to arrange so that. By arranging in this way, the sublimable dye can be sublimated uniformly over the entire surface to be dyed of the plastic lens.

  Although the heating temperature of the dyeing holding material 2 by the heating member 3 depends on the desired dyeing concentration and the like, it is usually about 130 to 250 ° C. When the heating temperature is lower than 130 ° C., a sufficient dyeing effect cannot be obtained, and when the heating temperature is higher than 250 ° C., discoloration and deformation of the plastic lens 1 occur. A preferable heating temperature is 150 to 230 ° C. Although the heating time of the dyeing holding material 2 depends on the desired dyeing concentration and the like, it is usually about 5 to 60 minutes. If the heating time is less than 5 minutes, a sufficient dyeing effect cannot be obtained, and if the heating time exceeds 60 minutes, the dyeing density becomes too high, or the plastic lens 1 is discolored and deformed. The heat treatment may be performed in the air or in a vacuum or a gas other than air. In a vacuum, the dye can easily penetrate into the lens, so that the dyeing time can be shortened.

  It is preferable to heat the plastic lens 1 to a predetermined temperature during the heat treatment. For example, as shown in FIGS. 1 to 4, it is preferable that the plastic lens 1 is dyed while being heated in a state where the plastic lens is placed or attached on the lens temperature controller 4. By heating the plastic lens 1, the molecular chains constituting the lens can be loosened, and the dye can easily penetrate into the lens. The temperature of the plastic lens 1 may be appropriately set depending on the kind of sublimable dye, the material of the lens, the dyeing density, etc., but is usually preferably 50 to 180 ° C, more preferably 100 to 150 ° C. When the temperature is lower than 50 ° C, the dye does not sufficiently diffuse inside the lens, and when the temperature is higher than 180 ° C, the plastic lens is discolored and deformed by heat.

  The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto.

Example 1
Formed on one surface of an aluminum plate (length 100 mm x width 100 mm) a surface that is almost complementary to the surface to be stained of the plastic lens (diameter 80 mm, error when the lens surfaces are overlapped is 2 mm or less) Thus, a dyeing holding material was produced. Inkjet printer (MMP-900RT, manufactured by Mastermind) and ink (including sublimation disperse dye for inkjet printer (HANAE-II, manufactured by Sanryu Co., Ltd.)) are used on the curved surface formed on the dyeing holding material. A pattern with a diameter of 80 mm was printed. As shown in FIG. 1, a plastic lens (diameter 75 mm, MR-8: polythiourethane, manufactured by Mitsui Chemicals) 1 is used as the lens holding member of the hot plate 4 with the dyed surface on the dyeing holding material 2 side. An aluminum plate (dyeing holding material 2) attached to 4 a and printed with a sublimable disperse dye was placed on the hot plate 3 through the heating buffer layer 5 with the printing surface 12 facing the plastic lens 1. As the heating buffer layer 5, a silicon sheet 5b having a thickness of 2 mm and a through-hole having a diameter of 80 mm (air layer 5a) was used. As shown in FIG. 6, the plastic lens 1, the center of the plastic lens 1, the center of the pattern of the aluminum plate (dyeing holding material 2), and the center of the through hole of the heating buffer layer 5 are substantially coaxial. The dyeing holding material 2 and the heating buffer layer 5 were arranged. The distance between the aluminum plate (dyeing holding material 2) and the plastic lens 1 was adjusted to 4 mm. While the plastic lens 1 was heated to 130 ° C., the aluminum plate (dyeing holding material 2) was heated to 200 ° C. and dyed for 30 minutes. When the treated plastic lens was visually observed, the entire lens was uniformly and uniformly dyed.

Example 2
The dyeing process was performed in the same manner as in Example 1 except that the aluminum plate (dyeing holding material 2) was directly placed on the hot plate 3 without using the heating buffer layer 5. When the treated plastic lens was visually observed, the entire lens was uniformly and uniformly dyed.

Example 3
As shown in FIG. 2, a cork sheet 5b having a thickness of 3 mm in which a through hole (air layer 5a) having a diameter of 80 mm is formed instead of a silicon sheet as the heat buffer layer 5, and an aluminum plate (dyeing holding material 2) Is attached to the hot plate 3 via a cork sheet 5b with the printing surface 12 facing the plastic lens 1, and an aluminum plate (dyeing support 2) is placed on the plastic lens 1 with a spacing of 5 mm from the plastic lens 1. Except for this, the dyeing treatment was performed in the same manner as in Example 1. When the treated plastic lens was visually observed, the entire lens was uniformly and uniformly dyed.

Example 4
As shown in FIG. 3, a hot plate 3 and an aluminum plate (dyeing holding material) are formed as a heating buffer layer 5 by using a network structure (diameter: 100 mm, thickness: 2 mm) in which copper wires are knitted in a lattice pattern instead of a silicon sheet. 2) between the plastic lens 1 and the aluminum plate so that the center of the plastic lens 1, the center of the aluminum plate pattern, and the center of the heating buffer layer (network structure) 5 are substantially coaxial. In addition, the dyeing treatment was performed in the same manner as in Example 1 except that the mesh structure was disposed. When the treated plastic lens was visually observed, the entire lens was uniformly and uniformly dyed.

Example 5
As shown in FIG. 4, a plurality of holes (air layer 5a) having a hole diameter of 1 mm, a depth of 1 mm, and a hole-to-hole interval of 2 mm are formed in a region of about 90 mm in diameter on the surface of the aluminum plate contacting the hot plate 3 as the heating buffer layer 5. ), And a pattern having a diameter of 80 mm is printed on the aluminum plate (dyeing holding material 2) on the plastic lens 1 side so that the center coincides with the center of the region where the air layer 5a is formed. Dyeing is carried out in the same manner as in Example 1 except that the plastic lens 1 and the aluminum plate are arranged so that the center of the region where the film is formed, the center of the pattern of the aluminum plate, and the center of the plastic lens 1 are substantially coaxial. Processed. When the treated plastic lens was visually observed, the entire lens was uniformly and uniformly dyed.

Comparative Example 1
As shown in FIG. 5, the inkjet printing paper (dyeing holding material 2) is directly placed on the hot plate 3 without providing the heating buffer layer 5, and the dyeing holding material 2 is heated to 180 ° C. for dyeing. Dyeing was performed in the same manner as in Example 1. Deflection was observed in the ink jet printing paper (dyeing holding material 2) by heating. When the plastic lens after treatment was observed with the naked eye, it was considerably uneven as compared with the lens of Example 1.

It is a schematic sectional drawing which shows the apparatus used for dyeing | staining of a plastic lens in Example 1. FIG. It is a schematic sectional drawing which shows the apparatus used for dyeing | staining of a plastic lens in Example 3. FIG. It is a schematic sectional drawing which shows the apparatus used for dyeing | staining of a plastic lens in Example 4. FIG. It is a schematic sectional drawing which shows the apparatus used for dyeing | staining of a plastic lens in Example 5. FIG. It is a schematic sectional drawing which shows the apparatus used for dyeing | staining of a plastic lens in the comparative example 1. In the heat treatment, it is an exploded view showing a state where the center of the plastic lens, the center of the dye-holding material provided with the sublimation dye, and the center of the region where the air layer of the heating buffer layer is formed are coaxially arranged. .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Plastic lens 2 ... Dye holding material 3 ... Heating member (hot plate)
4 ... Lens temperature controller (hot plate)
4a ... Lens holding member 5 ... Heat buffer layer 5a ... Gas layer (air layer) or vacuum layer 5b ... Silicon sheet or cork sheet
12 ・ ・ ・ Parts with sublimation dye (printed surface)

Claims (5)

In the method of dyeing a plastic lens by heating a dyeing holding material containing a sublimation dye with a heating member and sublimating the sublimation dye, the plastic on the plastic lens side surface of the dyeing holding material A curved surface substantially complementary to the surface to be dyed of the lens is provided, the dyeing holding material is disposed between the plastic lens and the heating member, and the curved surface of the dyeing holding material and the plastic lens A method for dyeing a plastic lens, wherein the surfaces to be dyed are opposed to each other with a predetermined interval. 2. The plastic lens dyeing method according to claim 1, wherein at least one heating buffer layer is provided between the dyeing holding member and the heating member. 3. The plastic lens dyeing method according to claim 1, wherein the heating buffer layer has a gas layer or a vacuum layer. 4. The plastic lens dyeing method according to claim 3, wherein the gas layer or the vacuum layer is provided by forming a plurality of holes in a surface in contact with the heating member of the dyeing holding material. Dyeing method. 5. The plastic lens dyeing method according to claim 3, wherein the gas layer or the vacuum layer is formed in a region having a size equal to or larger than a surface to be dyed of the plastic lens, and the gas layer or the vacuum layer is formed. The heating buffer layer and the dyeing holding so that the center of the region, the center of the dyeing holding material provided with the sublimation dye and the center of the dyed surface of the plastic lens are substantially coaxial. A plastic lens dyeing method comprising arranging a material and the plastic lens.

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