KR940003920B1 - Color contact lens - Google Patents

Abstract

The lens preserves the thickness like the general soft lens with good luster and transparency. The manufacturing procedure comprises: forming the first lens with 0.02-0.04 (mm) thickness exposed to ultraviolet rays after injecting two hydroxy ethyl metharcrelate (2-HEMA); forming the colored spot on the first lens after transferring a pattern on the lens; forming the colored area (12) of the desired color and shape on the second lens (15); the second lens recombining the first lens employing the casting mold method.

Description

Cosmetic colored contact lens and manufacturing method thereof

1 shows a lens manufactured by a conventional method.

1A is an enlarged cross-sectional view of a lens in which colored portions are located on an upper surface portion.

1B is an enlarged cross-sectional view of the lens in which the colored portion is located at the bottom surface portion.

Figure 1c is an enlarged cross-sectional view of the lens in which the colored portion is located on the surface of the upper layer and the bottom portion.

1D is an enlarged cross-sectional view of the lens where the colored portion is located on the surface portion of the lens.

2 is an example of the present invention produced using a casting mold method in a concave mold (concave mold).

3 is an example of the present invention is completed by the spin casting method after forming the primary lens in the concave moold casting method.

4 is an example of the present invention to form a primary lens by a spin casting method in a concave moold and then completed by a casting moold method.

5 is an example of the present invention produced using a spin casting method in a concave moold.

Figure 6 is an example of the present invention produced by the method of casting cast in a convex mold (convex mold).

FIG. 7 is an example of the present invention in which a primary lens is formed in a convex moold using a casting moold method and then completed by a spin casting method.

8 is an enlarged cross-sectional view of a lens completed according to the present invention.

* Explanation of symbols for main parts of the drawings

5: concave moold 6: convex moold

10: primary lens 12: coloring part

15 ': monomer for forming secondary lens 15: secondary lens

L: Beauty Contact Lenses

According to the present invention, in the beauty colored contact lens, the iris coloring portion colored in the desired shape and color while the lens thickness is comfortable to wear and excellent oxygen permeability like the thickness of a general contact lens is provided. The present invention relates to a new cosmetic contact lens positioned at the center of a contact lens and a manufacturing method thereof.

As the use of contact lenses has increased and their products have diversified, the development of cosmetic contact lenses that satisfy the aesthetic needs of women has been active for a long time. In Egypt, five thousand years ago, efforts were made to emphasize the beauty of the eyes and to change the color of the eyes for the beauty of women. Today, such desires are increasing.

In particular, women in Western cultures are increasingly interested in cosmetic lenses that can vary the color of the eyes by changing the color of the eyes according to individual personality.

There are two major types of cosmetic lenses. First, they are transparent colored lenses that use transparent dyes to emphasize transparency or block light, rather than changing the original iris color. However, with transparent colored lenses, brown eyes cannot change the color of the iris such as sky blue or light green to the desired color.

Second is an opaque colored lens that can change the original iris color to another color.

However, the opaque dyes or pigments used in this lens generally have a problem that it is difficult to color the pigment directly on the lens because the particle size is larger than the pores of the soft lens.

In order to solve this problem, the conventional opaque cosmetic lens was developed by attempting various manufacturing methods. In US Pat. No. 3,034,403, a method of coloring the front part of the lens with a certain color without distinguishing the pupil and the iris was attempted There are also problems with the combination of colorants and lenses and problems with vision categories, including pupils.

U.S. Patent No. 4376499 also provides a method of dipping and pressing the colorant onto the lens surface using a brush-like instrument, which states that the method causes deformation of the lens and causes toxicity to the human body. It is to completely combine with the surface or the inner surface of the lens, and the difficulty of the method is also described.

U.S. Patent Nos. 3536386 and 3679504 propose a method of arriving at a colorant between two completed soft lenses that have been polymerized using a coloring pattern. It has been proved to have the disadvantage of shortened lifespan due to turbulence and good adsorption of proteins, and easy cracking at the point where the colored and non-colored portions meet.

In US Pat. No. 3,712,718, in order to prevent the opaque dyes and pigments used for coloring from directly contacting the eye and causing harm, the iris shape is cut out in an already formed lens, and the polymerized color is inserted therein. The manufacturing process of the present invention is described, and US Patent No. 4,252,421 describes a cosmetic lens composed of two layers by combining a polymerized colorant with a general lens by a copolymerization reaction, and French Patent No. 1,499,774. Describes the cosmetic lens manufactured by artificially preparing pupils, irises, sclera, etc. using an opaque colorant, and then combining them with a soft lens and pouring a monoomer on it. The problem that the bonding force with the lens body is unstable and thick have. Another technique is to inject a monomer onto the polished glass plate, cover and shape the glass plate to form a thin hydrophilic polymer film, then color the coloring pattern and drop the monomer on it to repolymerize to complete the cosmetic lens. Although this method has been proposed, this method, which requires manual work by hand, has a big disadvantage that mass production is impossible and the cost is increased.

After that, cosmetic lenses have been continuously developed, and if opaque dyes and pigments come into direct contact with the eyes, they not only cause harm to various symptoms, but also reduce gloss and transparency, and the colored parts come off the lens. Has been trying to solve the problem.

In Korean Patent No. 046919, owned by the present inventor, the iris portion shows a cosmetic lens in which a lens is formed by polymerizing a contact lens on a printed film that arrives on a thin contact lens surface of a printed film. Although it has the advantage of expressing natural beauty by being expressed in the same way as the actual eye shape, there is a disadvantage that the mass production is impossible, expensive expenses are required, and the thickness of the lens is thickened to decrease the oxygen transmittance.

One of the recent cosmetic lens manufacturing methods is using a mould so that the coloring pattern is placed between the concave and the convex of the lens so that the colored part is removed when the lens is removed from the mould. There is a method in which the state is directly inserted into the lens. At this time, the coloring site is polymerized by mixing an opaque pigment and a monomer, the pigment itself acts as a polymerization inhibitor, the monomer (monomer) is likely to be in an incomplete polymerization state.

Korean Patent Laid-Open Publication No. 86-6045 discloses a method of coating a coloring coating on the surface of a contact lens or coating the coloring coating with the coloring coating, which is laminated with a transparent coating containing no pigment. This has been proposed.

However, this method does not completely solve the problem that only the manufacturing method is different from the existing process, the manufacturing process is complicated, and the coating is easy to be incompletely polymerized and the thickness of the lens becomes thick.

As with all plastics, a fully polymerized state is not toxic, but it is almost impossible to maintain a complete polymerization state by coating or the like. In an incomplete polymerization state, it is toxic due to the residual amount of monomer. For this reason, the toxicity generated at the pigmented part of the lens surface harms the upper eyelid when worn, and causes allergic reactions, keratitis, and protein adhesion.

The pigmented bird portion of the incompletely polymerized state is not completely combined with the lens body, so that the pigmented portion falls off from the surface of the lens, and it becomes difficult to maintain the glossiness or transparency of the lens.

Therefore, the coloring part is not in direct contact with the eye, which does not harm the eye, and while maintaining the same thickness as a general soft lens, there is a strong demand for the development of a cosmetic soft lens that maintains continuous beauty with excellent gloss and transparency.

An object of the present invention is to complete the research results to solve the above problems, to provide the following advantages.

In the present invention, the iris color is positioned at the inner center of the lens and the polymerization of the monomers is completed by using a mold so that no residual monomer is left. The present invention solves problems such as allergic reactions caused by conjunctivitis and protein adsorption, and at the same time provides cosmetic contact lenses having excellent oxygen permeability.

Yet another object of the present invention is to completely solve the disadvantage that the colored part is separated from the lens body because the whole lens is composed of one polymer, while maintaining excellent gloss and transparency and at the same time enabling mass production in an eye. To provide a manufacturing method.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

However, the content of the present invention is not limited only to the following examples.

The manufacturing process of the present invention uses a casting mold method and a spin casting method.

The casting moold method is a method of preparing a lens by polymerizing monomers while compressing two moulds by inserting a monomer between a concave mold and a convex mold.

The spin casting method is a method of preparing a lens by injecting a monomer for forming a lens into a concave moold and polymerizing the monomer by thinly spreading it by centrifugal force. Adopting the casting mold method or the spin casting method in the lens manufacturing process is not an essential part of the present invention.

Hereinafter will be described step by step the manufacturing process of the cosmetic lens of the present invention.

Example 1

① Inject a 2-hydroxy ethyl meta-arcrate (hereinafter referred to as 2-HEMA) into a concave mold (5) for a casting mold, and then apply 0.02 mm-under UV light. The primary lens 10 of about 0.04 mm is partially polymerized and molded.

② The color portion 12 is formed by transferring a pattern to the primary lens 10 after the pattern (pattern) in the etched plate. The monomers in the colored portion are partially polymerized according to convenience so that the monomers can be perfectly combined with the lens body.

③ Inject 2-HEMA (15 ') onto the primary lens 10 to which the coloring part 12 is attached, and then repolymerize in ultraviolet light using a casting mold method to complete the secondary lens 15. The unit 12 and the lens L are integrally formed with an iris-shaped colored portion 12 having a desired color and shape in the center of the interior thereof.

Example 2

(1) A monomer is injected into a concave mold 5 for spin casting and then polymerized in a suitable state to form a thin primary lens 10.

(2) The colored portion (12) having the model is transferred to the primary lens (10).

(3) Injecting the monomer (15 ') thereon and forming a thin secondary lens (15) by a spin casting method to complete the polymerization to complete the use lens (L).

Example 3

(1) After the monomer is injected into the concave mold (5), a thin secondary lens (10) is formed by a spin casting method.

(2) The colored portion 12 having the model is transferred onto the primary lens 10 and then polymerized.

③ The monomer 15 'is injected thereon, and the secondary lens 15 is molded by a casting mold method and the polymerization is completed, and the cosmetic lens L is completed.

Example 4

(1) A monomer is injected into a convex mold (6) using a casting mold method, and the primary lens 10 is formed on ultraviolet energy.

(2) The colored portion 12 is transferred onto the primary lens 10 and then polymerized.

③ The monomer 15 'is injected thereon, and the secondary lens 15 is formed by a casting mold method, and the polymerization lens is completed when the cosmetic lens L is formed.

Example 5

(1) A monomer is injected into a convex mold (6) using a casting mold method to form a primary lens (10).

② The colored portion 12 is formed by transferring onto the primary lens 10.

③ After injecting a monomer (15 ') thereon, the secondary lens (15) is formed by spin casting, and the polymerization is completed, and the cosmetic lens (L) is completed.

As described above, the conventional cosmetic lens (L ') forms the colored portion 12' to be part of the lens surface, so that the residual amount of monomer in the incompletely polymerized colored portion directly invades the eye, causing allergic reactions, conjunctivitis, While the glossiness, transparency and degradation of the colored portion come out of the lens, the cosmetic lens L of the present invention has a disadvantage of the conventional cosmetic lens because the colored portion 12 is seated inside the lens L. It solves perfectly.

The present invention is made of a two-layered lens, but since the colored portion 12 and the lens L are integrally molded, they can provide a comfortable fit with the same thickness as a general soft lens and can be supplied in large quantities at an eye. It is an invention having features.

Cosmetic lens (L) manufacturing method of the present invention is a manufacturing process of a contact lens made of a mold (Mold), the coloring portion 12 of the iris portion is made of a mixture of transparent or opaque dye, pigment and monomer (monomer) The monomer may be any synthetic resin used for thermoplastic contact lenses such as curable liquids or acrylic resins.

The colored portion 12 is preferably made to occupy 10% to 90% of the total and more preferably 50% to 90%, and the colored portion 12 may be formed of the primary molded lens 10 and the secondary lens ( 15) It is molded to be integrated with the lens body by using the manufacturing method of casting mold and spin casting so that it can be positioned between them, while the conventional cosmetic lens is much thicker than the general soft lens. The present invention is formed into a thin and safe cosmetic lens.

The coloring unit 12 uses a pad made of a material such as poly dimethyl siloxane to form a model of the colored portion on the etching plate, and then transfers and colors the primary molded lens 10 onto the primary molded lens 10. do. Generally, the colorant should not be removed from cleaning agents, antibacterial agents, or tears, and the colorant is 2-HEMA in the present embodiment, but acrylic resins or vinyl acetate resins may be selected and used to form a lens. (monomer) can use products, such as alcohol which has a hydroxyl group and esterifiable hydroxyl group as hydrophilicity. Examples thereof include polyalkylene glycol monoesters, monomers of methacrylic acid or acrylic acid, alkyl esters, and the like.

The polymerization reaction to form the cosmetic lens uses inorganic materials such as organic peroxides, alkyl percarbonates, hydrogen peroxide, ammonium, sodium and potassium persulfate as catalysts, or radiation and energy such as ultraviolet rays or X- You can proceed with ray, microwave, etc. The material of the mould (M) may be made of aluminum steel, polycarbonate, polysulfone, or the like, or may use various alloys such as nickel and tin. The rotation speed of the mold can be easily used between 20 rpm and 1000 rpm and varies depending on the type of catalyst, the initiator, the radiant energy, or the type and viscosity of the monomer.

Claims (6)

In the cosmetic coloring contact lens, the cosmetic coloring contact lens in which the iris-shaped coloring part 12 is formed between the primary lens 10 and the secondary lens 15 so that the coloring part 12 is located at the center of the lens. . In the method for manufacturing a cosmetic colored contact lens, after forming the primary lens 10 in a mold (old), an iris-shaped pattern is transferred thereon to form colored colored portions 12 and again A method of manufacturing a cosmetically colored contact lens in which a monomer is injected thereon to form a secondary lens (15) and polymerization is completed so that the coloring portion (12) is located at the center of the lens. The method of claim 2, wherein the primary lens is formed by a casting mold method in a concave mold, and then the secondary lens is formed by spin casting. The method of manufacturing a cosmetic colored contact lens according to claim 2, wherein the primary lens is formed by the spin casting method and then the secondary lens is formed by the casting mold method. The method of claim 2, wherein the primary lens is formed in a convex mold using a casting mold method, and then the secondary lens is formed with the casting mold. The method of manufacturing a cosmetically colored contact lens according to claim 2, wherein the primary lens and the secondary lens are formed by a spin casting method.