JP3646997B2 - Colored contact lens and manufacturing method thereof - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a colored contact lens and a method for producing the same.
[0002]
More specifically, the present invention relates to a colored contact lens and a method for manufacturing the same, which do not cause discoloration or omission of the colored pattern, and can conceal the original color of the human eye and exhibit other colors.
[0003]
[Prior art]
A colored contact lens (hereinafter referred to as a colored lens) is a transparent colored lens of the same color as the iris used to emphasize the original color of the human eye, and hides the iris color of the human eye. There are two patterns of colored lenses that are used to give a color different from the color, and the iris is colored opaque.
[0004]
These colored lenses are required to be free from color fading and dropping off of the colorant, to have a clear colored pattern, and to be easily and easily colored, and various studies have been made.
[0005]
For example, Japanese Patent Laid-Open No. 3-54519 discloses that a resin pattern in which an insoluble pigment or the like is dispersed is printed on the bottom of a casting mold, and then a monomer is placed in the casting mold to polymerize. Then, a method of processing the obtained lens block to obtain a colored lens with an iris pattern is disclosed, but this method requires a post-process for further processing the lens block into a finished lens shape, and the manufacturing process is complicated. There was a problem of being.
[0006]
U.S. Pat. No. 3,476,499 proposes precipitating insoluble material in a hydrogel lens to absorb light, but it has been found that it is not always easy to obtain a precipitate of the desired density.
[0007]
Japanese Patent Application No. Hei 5-156344 proposes a method of coloring an organic solvent that chemically reacts with a lens substrate with a colorant in order to prevent discoloration or discoloration of the colored pattern. Although this method is sufficient for fading, omission, etc., in order to conceal the original eye iris color, it is necessary to prepare a colorant using a white pigment as a turbidity agent. Skilled techniques were required to prepare the ink. In addition, in the color imparting process by the pad printer, it is necessary to print in the same color tone unit, and when printing with a different color tone, there is a preparation such as replacement of the transfer body, and the work may be complicated. .
[0008]
[Problems to be solved by the invention]
The object of the present invention is to conceal the original color of the iris of the eye, and there is no discoloration or loss of the colored pattern. Another object of the present invention is to provide a colored contact lens that is unnecessary and has little variation in color tone among lots of prepared ink, and that can be colored into a desired color by an efficient and simple operation, and a method for manufacturing the same.
[0009]
[Means for Solving the Problems]
The present invention has a white ink layer formed by coating and curing a white ink liquid containing at least a white pigment, 2-hydroxyethyl methacrylate and hexamethylene diisocyanate cyclic trimer on the surface of a substrate contact lens. The colored contact lens is characterized in that the iris portion which is the region of the white ink layer is colored with a reactive dye.
[0010]
Further, in the present invention, a white ink layer is formed by applying a white ink liquid comprising at least a white pigment, 2-hydroxyethyl methacrylate and hexamethylene diisocyanate cyclic trimer to the iris portion of the surface of the substrate contact lens and curing it. Forming the first step,
The substrate contact lens with the white ink layer region prepared in the first step is placed in a jig that masks the portion other than the iris portion and immersed in the reactive dye solution, and the iris portion that is the region of the white ink layer is removed. A second step of coloring,
This is a method for producing a colored contact lens comprising at least two steps as described above.
[0011]
As the white pigment, generally known inorganic fine powders such as titanium oxide, calcium carbonate, barium sulfate, calcium phosphate, talc, and alumina can be used, but titanium oxide is particularly effective because of its excellent hiding power. Is preferably used.
[0012]
The white ink layer is preferably formed in an iris pattern, but a uniform layer can be formed on a desired portion of the lens according to the purpose, and a white layer is formed in the pupil for the purpose of artificial eye etc. You can also.
[0013]
The material of the contact lens is preferably a polyhydroxyethyl methacrylate (P-HEMA) -based water-containing soft contact lens, but glycidyl methacrylate-based polymer, vinyl pyrrolidone-based polymer, or a copolymer thereof is ethylene glycol as a crosslinking agent. The present invention can also be applied to a polymer system containing an alkylene glycol dimethacrylate represented by dimethacrylate.
[0014]
As the reactive dye, those confirmed to be physiologically safe are preferably used. Specifically, Reactive Black 5, Reactive Blue 21, Reactive Orange 78, Reactive Yellow 15, Reactive Blue No. 19, Reactive Blue No. 19 4, C.I. I. Reactive Red 11, C.I. I. Reactive Yellow 86, C.I. I. Reactive Blue 163, C.I. I. Reactive blue 77 can be used alone or in combination of two or more.
[0015]
The white ink liquid is titanium oxide 10-50 parts by weight, polyvinylpyrrolidone 15-30 parts by weight, hexamethylene diisocyanate cyclic trimer 10-20 parts by weight, 2-HEMA 60-80 parts by weight, polymerization initiator 0.2. It is preferable to prepare by mixing ~ 0.4 part by weight. In this case, in particular, when the amount of titanium oxide is more than 50 parts by weight, the printing of the iris pattern of the white ink layer becomes unclear, and unnecessary unevenness is imparted to the lens surface, which is not preferable. On the other hand, when the amount is less than 10 parts by weight, the iris pattern of the white ink layer is insufficiently printed, the hiding power is lowered, and the intended color tone and uniform iris pattern cannot be obtained.
[0016]
【Example】
Hereinafter, the present invention will be specifically described by way of examples.
[0017]
(A) Preparation of white ink liquid After 30 parts by weight of titanium oxide and 20 parts by weight of polyvinylpyrrolidone were pulverized and mixed in a mortar, hexamethylene diisocyanate cyclic trimer (trade name Duranate, TPA-100, manufactured by Asahi Kasei) 15 parts by weight, 70 parts by weight of 2-HEMA and 0.3 parts by weight of azobisisobutyronitrile (AIBN) were added and kneaded uniformly, and 150 parts by weight of thinner was further added to obtain a white ink liquid.
[0018]
(B) Formation of white ink layer A dried P-HEMA hydrous soft contact lens finished product was fixed to a printing jig with the front side facing up. Next, the white ink liquid was applied to the iris pattern portion of the stainless steel plate with the iris pattern. Next, an iris pattern was printed on the lens using a silicone transfer body of a printing machine for pad printing. Immediately after printing, it was placed in an oven at 80 ° C. and polymerized for 16 hours to obtain a lens with a white ink layer. After this, the lens was swollen with physiological saline.
[0019]
(C) Coloring method of lens with white ink layer In order to mask only the iris part forming the white ink layer, the swollen lens prepared in (B) is placed in a dedicated jig.
[0020]
As the color tone, each color is used singly or in combination of two or more types, but the brown, blue and green colors as basic color tones will be described below.
[0021]
(Brown)
C. I. Reactive Red 11 2.4g, C.I. I. 2.4 g of Reactive Yellow 86 and 10 g of Reactive Black 5 are dissolved in 800 ml of purified water, and 8 g of sodium sulfate as an auxiliary agent is added to prepare a brown colored dye solution. The swollen lens masked with a dedicated jig is immersed in the colored dye solution together with the jig, and is held at 55 ° C. for about 60 minutes for dyeing. After the dyeing process is finished, the colored dye solution is taken out, washed with running water together with the jig, the lens is taken out from the jig, and an alkaline solution treatment known as a general reactive dye fixing method is applied, and the iris part is brown. A colored lens was obtained.
[0022]
(Blue)
Similarly, C.I. I. 16 g of reactive blue 77 is dissolved in 800 ml of purified water, and a blue colored dye solution is prepared in the same manner. A lens masked with a dedicated jig is immersed in the colored dye solution together with the jig and held at 55 ° C. for about 60 minutes. Thereafter, the same processing as described above was performed to obtain a colored lens having a blue iris part.
[0023]
(Green)
Similarly, C.I. I. 12.8 g of reactive blue 77, C.I. I. 3.2 g of reactive yellow 86 and these two kinds of dyes are dissolved in 800 ml of purified water, and a green colored dye solution is prepared in the same manner. A lens masked with a dedicated jig is immersed in the colored dye solution together with the jig and held at 55 ° C. for about 60 minutes. Thereafter, the same process as described above was performed to obtain a colored lens having a green iris part.
[0024]
(D) Evaluation The above three types of colored lens iris patterns and the degree of concealment were observed with the naked eye and a magnifying glass (× 20 times) after coloring and washing.
[0025]
Next, as a durability test of the colored pattern, these colored lenses were boiled for 6 hours with physiological saline, but no color fading or dropping off was observed.
[0026]
In addition, the colored lens after the durability test was subjected to a rubbing test on the index finger by dripping a dedicated cleaning agent on a special sponge cleaning puff. It was.
[0027]
【The invention's effect】
According to the present invention,
1. The white ink layer on the surface of the substrate contact lens is firmly bonded to the lens substrate by chemical bonding, and the region of the white ink layer is colored with a reactive dye, so that the colored layer does not lose color or fall off.
2. By forming a white ink layer having excellent hiding power, the original iris color of the eye can be changed to a desired iris color.
3. Conventionally, titanium oxide, which has been used as a turbid agent, is applied separately from the dye, so that variations in ink color tone between preparation lots are small, and a stable color tone can be obtained.
That is, since various color tones can be obtained by combining only reactive dyes, fine adjustment of the color tone and density is easy.
4). The substrate contact lens can be stored in a state in which a white ink layer is formed, and can be easily colored to a desired color tone as necessary, so that it is not necessary to have an unnecessary product inventory of colored lenses.

Claims (4)

A white ink layer formed by applying and curing a white ink liquid containing at least a white pigment, 2-hydroxyethyl methacrylate and hexamethylene diisocyanate cyclic trimer on the surface of the substrate contact lens, A colored contact lens, wherein an ink layer region is colored with a reactive dye. 2. The colored contact lens according to claim 1, wherein the white ink layer is formed in an iris pattern or uniformly on an entire surface of an iris portion that is a region of the white ink layer. The colored contact lens according to claim 1, wherein the white pigment is titanium oxide. First, a white ink layer comprising at least a white pigment, 2-hydroxyethyl methacrylate and hexamethylene diisocyanate cyclic trimer is applied to the iris portion of the surface of the substrate contact lens and cured to form a white ink layer. Process,
The substrate contact lens with the white ink layer region prepared in the first step is placed in a jig that masks the portion other than the iris portion and immersed in the reactive dye solution, and the iris portion that is the region of the white ink layer is removed. A second step of coloring,
The manufacturing method of the colored contact lens characterized by including the above at least 2 processes.