KR102149839B1 - Method of manufacture for colored contact lens - Google Patents

Abstract

The present invention relates to a method for manufacturing a colored contact lens in which a colored layer is formed in a laminated structure on the outer surface of the contact lens, the method comprising a step for manufacturing a colored contact lens in which an iris pattern is transferred from an iris pattern portion containing a colored layer forming material to a silicon pad portion, and then the silicon pad portion is pressed onto the upper surface of the prepared contact lens and coloring with the iris pattern. The present invention is characterized in that the colored layer forming material is uniformly supplied to the iris pattern portion (F) at a predetermined thickness, and is also characterized in that a binder component of the colored layer forming material is composed of the same component as the molding material of the previously prepared contact lens (A) to improve the affinity between the iris pattern (Fa) and the contact lens (A), so that the iris pattern (Fa) is stably and uniformly formed on the contact lens (A), thereby keeping the life of the iris pattern Fa is maintained for a long time.

Description

TECHNICAL FIELD [Method of manufacture for colored contact lens]

The present invention relates to a method of manufacturing a colored contact lens, and more specifically, to a method of manufacturing a colored contact lens by molding so that a colored layer is stably laminated on the outer surface of the contact lens.

In general, colored contact lenses are manufactured to change the color of the iris by coloring the contact in the center of the lens according to the shape of the iris, and it is mainly applied to uncorrected contact lenses to change the visual effect. However, it is also applied to contact lenses for vision correction.

The manufacturing technology of colored contact lenses is known in various ways, but the method of color printing in the shape of an iris at a certain position of the contact lens is mainly directed, but the iris shape is not natural, the colored layer is easily damaged, and the user wears a coated contact lens. When used, pigments and dyes are easily in contact with the cornea, causing problems such as dry eye syndrome and visual impairment.

For example, in relation to the manufacturing technology of the colored contact lens, in the color contact lens provided with an iris-shaped colored part in Patent Document 1, the method comprising: coloring a design having a desired shape on a corrosion plate to corrode it; Printing a composition for forming a colored part on the corrosion plate on which the design is formed; Attaching the printed composition for forming a colored part to a silicone pad; Printing a silicone pad on a mold to transfer the design composed of the composition for forming the colored part to the mold; Irradiating UV for 8 to 25 minutes until the polymerization rate of the composition for forming the colored part becomes 60 to 80%, and polymerizing the composition to form a colored part; Disclosing a method of manufacturing a color contact lens comprising a step of forming a lens by applying a lens-forming polymer to the upper portion of the colored portion, and in the colored contact lens having an iris-shaped colored portion in Patent Document 2, a corrosion plate Corroding the iris shape design of the desired shape; Printing a composition for forming a colored part including a color powder, 2-HEMA, a polymerization initiator, and a crosslinking agent on the corrosion plate on which the design is formed; Attaching the printed composition for forming a colored part to a silicone pad; Printing a silicone pad on the upper mold to transfer the design composed of the composition for forming the colored part to the mold; Forming a spherical colored portion by polymerizing the composition by irradiating UV for 25 to 60 minutes until the polymerization rate of the composition for forming the colored portion is 90 to 95%; And a method of manufacturing a colored contact lens in which the colored part is embedded in the lens by applying the lens-forming polymer to the hammold, inserting the upper mold with the colored part formed therein, and polymerizing the lens-forming polymer. .

In addition, a coating solution manufacturing step of preparing a transparent coating solution in Patent Document 3; A transparent coating step of forming a transparent coating layer by transparent coating the transparent coating solution on an upper mold; A first drying step of drying the transparent coating layer; A color coating step of forming a color coating layer by color coating on the dried transparent coating layer; A second drying step of drying the color coating layer; A polymerization solution injection step of injecting a polymerization solution between the upper and lower molds; A polymerization step of polymerizing the injected polymerization solution; Disclosed is an alginate coating method for a contact lens comprising a contact lens separation step of separating the contact lens from the upper and lower molds.

The inventors of the present application have a simple manufacturing process, easy to arbitrarily control the concentration of the colored layer, and to maintain the life of the colored layer for a long time, the coloring layer is stably laminated on the outer surface of the contact lens. A contact lens was manufactured and the present invention was completed.

KR 10-0910298 B KR 10-1190303 B KR 10-1810370 B

The problem to be solved in the present invention relates to providing a method of manufacturing a colored contact lens by molding so that a colored layer is laminated on the outer surface of the contact lens.

More specifically, a colored contact lens is manufactured by a simple method by a coloring process in which a colored layer forming material composed of a component included in the contact lens molding material is formed on the outer surface of the contact lens with a stable and uniform thickness layered structure. It is for the purpose of how to do it.

As a means of solving the problems of the present invention, a method for manufacturing a colored contact lens is a). A first step of supplying a colored layer forming material from the colored layer forming material supply means to the iris pattern portion, b). A second step of transferring the colored iris pattern from the iris pattern portion to the silicon pad portion, c). A third step of placing the prepared contact lens fixedly in the lens seat, d). A fourth step of forming a colored layer on the front surface of the contact lens by bonding the iris pattern transferred to the silicon pad portion of the second step to the upper surface of the contact lens placed in the lens seat portion, and e). And a fifth step of separating the silicone pad portion and removing the colored contact lens from the lens seat portion.

A method of manufacturing a colored contact lens according to an embodiment of the present invention a). The colored layer forming material (F1) from the colored layer-forming material supply means (2) installed on the upper part of the support frame (1) so as to be movable in a sliding manner to the iris pattern portion (F) formed in the lower support frame (1) A first step of supplying and b). The colored layer forming material supply means 2 installed on the supporting frame 1 is moved from the supporting frame 1 in a sliding manner to expose the iris pattern part F containing the colored layer forming material to the outside, and then a silicon pad A second step of lowering the portion S to transfer the iris pattern Fa from the iris pattern portion F to the silicon pad portion S, and c). A third step of placing the prepared contact lens (A) fixedly in the lens mounting portion 3, and d). The material for forming the colored layer of the iris pattern F2 is cured by bonding it to the upper surface of the contact lens placed in the lens receiving unit 3 while lowering the silicon pad unit S to which the iris pattern F2 has been transferred. To form a colored layer (B) and e). And a fifth step of removing the colored contact lens L by separating the silicon pad portion S upwardly from the lens seat portion 3.

The lower surface of the support frame 1 according to the present invention is installed in contact with the upper surface of the colored layer-forming material supplying means 2, and the colored layer-forming material supplying means 2 slides from the support frame 1 Is made to move in a way.

The colored layer forming material (F1) of the present invention is composed of a colorant, a binder component, and a solvent, and the binder component is preferably a component included in the molding material of the contact lens (A) prepared for coloring.

The colored contact lens manufacturing method of the present invention has a simple manufacturing process, and by combining a colorant with a component included in the molding material of the contact lens as a binder component, the colored layer has good affinity with the contact lens, so that the color layer is applied to the surface of the contact lens. It shows the effect that the colored layer is formed in a stable and uniformly-thick laminated structure, and the life of the colored layer is maintained for a long time.

1 is a diagram schematically showing a manufacturing process of a colored contact lens according to the present invention
2 is a schematic view showing a colored contact lens according to the present invention

Hereinafter, the present invention will be specifically described with reference to specific details for carrying out the present invention, but the present invention is not limited by the following description.

1 is a diagram schematically showing a manufacturing process of a colored contact lens L according to the present invention, and FIG. 2 is a view schematically showing a colored contact lens according to the present invention, and the present invention with reference to FIGS. 1 and 2 When explaining in more detail the manufacturing method of the colored contact lens,

1 and 2, the colored contact lens L of the present invention has a structure in which a contact lens A and a colored layer B are stacked in an iris pattern in the center of the outer surface of the contact lens.

As shown in Fig. 1, the method of manufacturing a colored contact lens of the present invention is a). The colored layer forming material (F1) from the colored layer-forming material supply means (2) installed on the upper part of the support frame (1) so as to be movable in a sliding manner to the iris pattern part (F) formed in the lower support frame (1) A first step of supplying and b). The colored layer forming material supply means (2) installed on the support frame (1) is moved from the support frame (1) in a sliding manner to expose the iris pattern portion (F) containing the colored layer forming material (F1) to the outside. , A second process of lowering the silicon pad portion S to transfer the iris pattern Fa from the iris pattern portion F to the silicon pad portion S, and c). A third step of placing the prepared contact lens (A) fixedly in the lens mounting portion 3, and d). The material for forming the colored layer of the iris pattern Fa is cured by bonding it to the upper surface of the contact lens placed in the lens seat 3 while lowering the silicon pad part S to which the iris pattern Fa has been transferred. To form a colored layer (B) and e). It consists of a fifth step of removing the silicon pad part S upward from the lens seat part 3 to take out the colored contact lens L.

In the first process according to the present invention, the colored layer is formed from the colored layer forming material supply means (2) to the iris pattern portion (F) formed on the support frame (1) in order to form the colored layer (B) as an iris pattern on the contact lens. This is a step of supplying the forming material F1.

The colored layer forming material supply means (2) is provided with a colored layer forming material supply port (2a) to supply the colored layer forming material (F1) to the iris pattern portion (F) formed in the support frame (1). It is preferable that the frame 1 is made of a steel material.

In addition, the lower surface of the support frame 1 and the upper surface of the colored layer forming material supply means 2 are installed in close contact with each other, and the colored layer forming material supply means 2 slides from the support frame 2. It is combined to be movable.

The iris pattern part F formed on the support frame 1 forms an iris shape by etching the surface of the support frame 1 made of steel material into fine dots (dots) by a laser etching method, and the depth of the laser etching is fine. Etching is performed to a certain depth so that the colored layer forming material can be deposited on the dots (dots).

The depth of the laser etching is determined according to the concentration of the desired iris pattern and is formed to be approximately 10 to 20 μm, and the diameter of the iris pattern part F is correlated with the swelling rate (water content) of the contact lens, but approximately 5 It is formed to ~ 14mm.

Since the support frame (1) and the colored layer forming material supply means (2) are installed in close contact with each other, it is particularly important to precisely form the iris pattern part (F) so that there is no protruding part due to melting during the laser etching process. In addition, the lower surface of the support frame 1 and the upper surface of the colored layer forming material supply means 2 are in close contact with each other and move, thereby obtaining an iris pattern having a uniform thickness.

The binder component of the colored layer forming material (F1) according to the present invention is preferably composed of the same components as the hydrophilic polymerizable monomer and auxiliary monomer, which are the molding materials of the contact lens (A) prepared in the third step.

The colored layer-forming material (F1) according to the present invention includes 5 to 15% by weight of a pigment for the desired coloring and 60 to 70% by weight of 2-hydroxyethyl methacrylate (2-HEMA), a polymerizable monomer as a binder component It includes, and consists of an auxiliary monomer, an initiator, a crosslinking agent and a solvent.

As the co-monomer, at least one component selected from N-vinylpyrrolidone, N,N-dimethylacrylamide and methacrylic acid is selected, and based on 2-hydroxyethyl methacrylate (2-HEMA), 5 It is preferable to blend in a ratio of ~ 10%.

The crosslinking agent is one or more from methacrylic acid, methyl methacrylate, glycidyl methacrylate, ethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, and aryl methacrylate. The ingredients are selected and based on the total weight of the colored layer forming material It is preferable to contain 0.3 to 1% by weight.

Examples of the initiators include benzoyl peroxide, cumyl peroxide, butyl peroxide, butyl peroxybenzoate, 2,2'-azobis (2,4-dimethylpentanenitrile) and 2,2'-azobis (2-methyl Propanenitrile) is selected from at least one component, and preferably contains 0.03 to 0.5% by weight based on the total weight of the colored layer forming material, and a solvent is included in order to maintain a viscosity suitable for coloring the iris pattern.

As the pigment, a pigment used for coloring contact lenses is selected, CI REACTIVE BLACK 5 (CAS NO. 17095-24-8), titanium oxide (TITANIUM DIOXIDE), D&C YELLOW (CAS NO. 8004-92-0), and Iron oxide (IRON OXIDE) and D&C GREEN (CAS NO. 128-80-3) are exemplified, and 2-ethoxyethanol and N-butyl acetate are used as solvents.

The second process according to the present invention is a process of exposing the iris pattern portion (F) containing the colored layer forming material to the outside to transfer the iris pattern (Fa) from the iris pattern portion (F) to the silicon pad portion (S). , The iris pattern portion F in which the colored layer forming material is accommodated moves the colored layer forming material supply means 2 in a sliding manner to expose the iris pattern portion F to the outside.

By moving the colored layer forming material supply means 2 in a sliding manner, the colored layer forming material F1 accommodated in the iris pattern portion F can be maintained at a uniform thickness, and the colored layer forming material F1 In order to be formed with a uniform thickness, it is important to install the colored layer forming material supply means 2 in close contact with the supporting frame 1 installed below.

The third process according to the present invention is a process in which the contact lens A is fixedly placed in the lens seat 3 in order to color the contact lens A, and the contact lens A is a well-known conventional contact lens. Select the one made with the molding material.

The contact lens molding material of the contact lens (A) is, for example, a hydrophilic polymerizable monomer, 2-hydroxyethyl methacrylate (2-HEMA) as a main component, as an auxiliary monomer, and N-vinylpyrrolidone , N,N-dimethylacrylamide and at least one component selected from methacrylic acid, and crosslinking agents include ethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, and aryl methacrylate Benzoylperoxide, cumylperoxide, butylperoxide, butylperoxybenzoate, 2,2'-azobis (2,4-dimethylpentanenitrile) and 2,2'-azobis as at least one component and initiator selected from It consists of at least one component selected from (2-methylpropanenitrile) and an adjuvant.

In addition, in the contact lens (A) of the present invention, in addition to the hydrophilic polymerizable monomer and co-monomer, a phosphorylcholine-based monomer may be additionally formed, and the phosphorylcholine-based monomer is phosphorylcholine formed by polymerization. )-Based polymer improves the wettability of the contact lens and improves the fit of the contact lens.

The phosphorylcholine-based polymer is a material known in the art to which the present invention pertains, and for example, in the copolymerization of a phosphorylcholine-based monomer, 2-methacryloyloxyethylphospholinecholine monomer. Is manufactured by

The fourth process according to the present invention is a process of forming the iris pattern Fa transferred to the silicon pad portion S on the upper surface of the contact lens A, and lowering the silicon pad portion S to lower the seat portion 3 ), the iris pattern (Fa) is formed on the upper surface of the contact lens (A) placed in the contact lens (A) is pressed at 100 ~ 130 ℃ 30 ~ 60 minutes.

When the silicon pad part S is pressed against the upper surface of the contact lens A, the silicon pad part S is compressed along the curved surface of the contact lens A due to its elastic properties, and is then compressed to the upper surface of the contact lens A. The iris pattern Fa is transferred, polymerized and cured by heating to form the colored layer B of the iris pattern Fa on the outside of the contact lens A.

Thereafter, as in the fifth process of the present invention, the silicone pad part S is separated upward from the lens seat part 3 to take out the colored contact lens L, and the colored contact lens L is processed, etc. It is produced as a finished product by performing the process.

In the manufacturing method of the colored contact lens (L) according to the present invention, the support frame (1) and the colored layer forming material supply means (2) are installed in contact with each other so as to be movable in a sliding manner, It is characterized by uniformly supplying the layer-forming material at a certain thickness.

Another feature of the present invention is that the iris pattern portion (F) forms the surface of the support frame (1) by a laser etching method, and a contact prepared with a binder component of the colored layer forming material (F1) in advance The iris pattern (Fa) is formed stably and uniformly on the contact lens (A) by improving the affinity between the iris pattern (Fa) and the contact lens (A) by using the same ingredients as the molding material of the lens (A). It has the characteristic of maintaining the life of (Fa) for a long time.

A: contact lens, F: iris pattern portion, F1: colored layer forming material Fa: iris pattern, S: silicone pad portion, L: colored contact lens, 1; Support frame, 2: means for supplying epitaxial layer forming material, 3: contact lens seat

Claims (5)

a). A colored layer forming material supply means installed on the upper part of the support frame 1 in which the iris pattern portion F is formed by etching the surface of the support frame 1 into fine points by a laser etching method so as to move in a sliding manner A first step of supplying the colored layer forming material (F1) from (2) to the iris pattern portion (F) formed on the lower support frame (1),
b). The colored layer forming material supply means (2) installed on the support frame (1) is moved from the support frame (1) in a sliding manner to expose the iris pattern portion (F) containing the colored layer forming material (F1) to the outside. , A second process of transferring the iris pattern Fa from the iris pattern part F to the silicon pad part S by lowering the elastic silicone pad part S so that it can be compressed along the curved surface of the contact lens,
c). A third step of placing the prepared contact lens (A) fixedly in the lens receiving portion 3,
d). While lowering the silicon pad part S to which the iris pattern Fa has been transferred, the upper surface of the contact lens placed in the lens receiving part 3 is crimped along the curved surface of the contact lens, and heated to 100 to 130°C. And a fourth step of forming a colored layer (B) by curing the colored layer forming material of the iris pattern (Fa) by pressing, and
e). And a fifth step of removing the silicon pad portion (S) upward from the lens seat portion (3) to take out the colored contact lens (L). delete delete The method according to claim 1, wherein the colored layer forming material (F1) is a colorant for coloring 5 to 15% by weight and a polymerizable monomer as a binder component, 2-hydroxyethyl methacrylate (2-HEMA) 60 to 70% by weight, auxiliary It is composed of a monomer, a crosslinking agent, an initiator and a solvent,
The co-monomer is selected from at least one component selected from N-vinylpyrrolidone, N,N-dimethylacrylamide, and methacrylic acid, and is 5 based on 2-hydroxyethyl methacrylate (2-HEMA). Blended in a ratio of ~ 10%,
The crosslinking agent is selected from one or more components from ethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, and aryl methacrylate, based on the total weight of the colored layer forming material 0.3 It contains ~ 1% by weight,
Examples of the initiators include benzoyl peroxide, cumyl peroxide, butyl peroxide, butyl peroxybenzoate, 2,2'-azobis (2,4-dimethylpentanenitrile) and 2,2'-azobis (2-methyl Propanenitrile), one or more components are selected, containing 0.03 to 0.5% by weight based on the total weight of the colored layer forming material, and a solvent is formed,
The contact lens (A) is formed of a contact lens molding material composed of the polymerizable monomer, 2-hydroxyethyl methacrylate (2-HEMA), and the same ingredients as the initiator and crosslinking agent. Way. The method for manufacturing a colored contact lens according to claim 4, wherein a phosphorylcholine-based monomer is additionally formed in the molding material of the contact lens (A).

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