KR20230010057A - Method of Manufacturing Coating Solution for Color Contact Lenses - Google Patents

Abstract

The present invention relates to a method for manufacturing a coating solution for color contact lenses, and more particularly, to a method for manufacturing a coating solution for color contact lenses with improved physical properties such as biocompatibility, tensile strength, and wettability by containing collagen, which is a biomaterial, in a coating layer that comes in direct contact with a wearer's cornea. The method for manufacturing a coating solution for color contact lenses comprises the steps of: pre-processing atelocollagen; preparing an atelocollagen solution containing the pre-processed atelocollagen; preparing a hydroxyethyl methacrylate solution; preparing a mixture by stirring the atelocollagen solution and the hydroxyethyl methacrylate solution; and adding at least one monomer to the mixture and then polymerizing the same to form a coating polymer.

Description

Manufacturing method of coating solution for color contact lenses {Method of Manufacturing Coating Solution for Color Contact Lenses}

The present invention relates to a method for manufacturing a coating solution for color contact lenses, and more particularly, to manufacture color contact lenses with improved physical properties such as biocompatibility, tensile strength, and wettability by containing collagen, a biomaterial, in a coating layer in direct contact with the cornea. It relates to a method for preparing a coating solution.

A color contact lens (hereinafter, referred to as a color lens) refers to a contact lens in which a pigment that supports changing all or part of the color of the wearer's iris to a selected color is applied to a specific area selected. Such a color contact lens is to change the color of the iris by coloring the contact lens for vision correction according to the shape of the iris.

These color lenses, also referred to as beauty lenses and circle lenses, can give an external aesthetic sense while correcting eyesight, so demand for them is steadily increasing not only in Korea but also abroad. However, as a factor commonly mentioned by consumers of color lenses, there is discomfort in wearing them for a long time. As a result of the investigation, many consumers who wore color lenses for a long time experienced side effects such as foreign body sensation, dry eye syndrome, keratitis, and corneal edema.

As a specific example of causing side effects, due to defects in the process for applying pigment to the iris coloring part or the pigment exposed to the outer skin, damage is applied to the inner surface of the eyelid while causing continuous friction with the inner surface of the eyelid, resulting in conjunctivitis etc. may occur. In addition, the coating liquid applied to the color lens includes organic compounds and organic solvents for uniform mixing with organic pigments and viscosity stabilization, which directly contact the cornea and continuously stimulate it.

In order to reduce the side effects of these color lenses, many studies are currently in progress. For example, Korean Patent Publication No. 10-2020-0107904 introduces a technique that can reduce damage to the eyelid and cornea by reducing the friction coefficient of the contact lens by adding hydrophilicity to the coating solution for contact lenses by including a hydrophilic polymer, there is.

However, despite these studies, the problem of long-term wearing of color lenses is still a problem to be solved. Accordingly, the present invention has developed a technology capable of improving the wearing comfort by improving the hydrophilicity and biocompatibility of the color lens coating layer, and at the same time securing excellent physical properties of the color lens.

The technical problem to be achieved by the present invention is to provide a coating solution for color contact lenses comprising a hydrophilic coating polymer containing collagen as a biomaterial, and a color contact lens having excellent biocompatibility and mechanical properties manufactured by the same. .

The technical problem to be achieved by the present invention is not limited to the above-mentioned technical problem, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

In order to achieve the above technical problem, the color contact lens coating solution according to an embodiment of the present invention is a coating polymer containing atelocollagen and hydroxyethyl methacrylate in an amount of 50 to 100 based on 100 weight of the coating solution for color contact lenses. 95% by weight, and the atelocollagen is included in 0.1 to 3% by weight based on 100% by weight of the coating polymer. The atelocollagen has an endotoxin content of 0.001 to 0.3 EU/ml, a purity of 95% to 99.9%, and a DNA content of 0.0005 to 0.001 ng/ml. The viscosity of the coating solution is characterized in that 200 cp to 400 cp.

In addition, the method for producing a color contact lens coating liquid according to an embodiment of the present invention includes the steps of pre-treating atelocollagen; Preparing an atelocollagen solution containing the pretreated atelocollagen; Preparing a hydroxyethyl methacrylate solution containing hydroxyethyl methacrylate and an acid; Preparing a mixture by stirring the atelocollagen solution and the hydroxyethyl methacrylate solution; and adding at least one monomer to the mixture, followed by polymerization to form a coating polymer. includes

The pretreatment step includes dipping (soaking) the connective tissue of the atelocollagen raw material in an acid solution to expand the connective tissue; Grinding the expanded connective tissue in an acidic condition and then washing to obtain a collagen matrix; and salt-treating the collagen matrix to extract atelocollagen; It is characterized in that it includes. The pretreated atelocollagen has an endotoxin content of 0.1 to 0.3 EU/ml, a purity of 95% to 99.9%, and a DNA content of 0.0005 to 0.001 ng/ml. In the mixture, the atelocollagen and the hydroxyethyl methacrylate are characterized in that they have a content ratio of 1: 5 to 1: 25.

In addition, the color contact lens according to an embodiment of the present invention, the lens base layer forming the base of the color contact lens; a printing layer located on the lens base layer and including a pigment for color implementation; and a coating layer positioned on the printing layer and forming a surface in contact with the cornea. Including, the coating layer comprises a coating polymer containing atelocollagen and hydroxyethyl methacrylate, wherein the atelocollagen is characterized in that it comprises 0.1 to 3 weight relative to 100 weight of the coating polymer. The lens base layer includes a silicone hydrogel polymer, and the silicone hydrogel polymer includes polydimethylsiloxane and dimethylacrylamide in a content ratio of 1:1.5 to 1:2.5. The silicone hydrogel polymer is characterized in that hydroxyethyl methacrylate is included in an amount of 1 to 30 weight based on the total weight of the polymer.

According to an embodiment of the present invention, by preparing a coating solution for color contact lenses comprising a hydrophilic coating polymer containing collagen, which is a biomaterial, to improve the biocompatibility of the coating layer of the lens in direct contact with the cornea, thereby improving the feeling of wearing The side effects of eye diseases can be significantly reduced.

In addition, by manufacturing a color contact lens including the coating layer of the present invention and synthesizing and blending a silicone hydrogel material, which is a lens raw material, the color contact lens of the present invention has excellent mechanical properties such as improved biocompatibility, wettability, and tensile strength. properties can be obtained at the same time.

The effects of the present invention are not limited to the above effects, and should be understood to include all effects that can be inferred from the description of the present invention or the configuration of the invention described in the claims.

1 is a flow chart showing a method for manufacturing a color contact lens coating solution according to an embodiment of the present invention.
2 is a schematic diagram showing the structure of a color contact lens according to an embodiment of the present invention.
3 is an image showing the result of measuring the purity of atelocollagen according to Example 1 of the present invention.
Figure 4 is a table showing the results of the virus verification test of atelocollagen according to Example 1 of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and, therefore, is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, combined)" with another part, this is not only "directly connected", but also "indirectly connected" with another member in between. "Including cases where In addition, when a part "includes" a certain component, it means that it may further include other components without excluding other components unless otherwise stated.

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

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

<Coating solution for color contact lenses>

The coating solution for color contact lenses of the present invention includes a coating polymer including atelo collagen and hydroxyethyl methacrylate (HEMA). The coating solution may form a coating layer, which is an inner surface of the color contact lens in direct contact with the cornea.

Specifically, the coating polymer may be obtained by forming a copolymer of the atelocollagen and the hydrophilic monomer of hydroxyethyl methacrylate. The coating polymer is a hydrophilic natural polymer containing atelocollagen, and exhibits excellent biocompatibility to minimize irritation when the coating layer directly contacts the cornea, thereby providing excellent wearing comfort even when the lens is used for a long time.

The atelocollagen is collagen obtained by removing a telopeptide portion in which an antigen is located in porcine skin. When the atelocollagen is applied to the lens coating solution, biocompatibility can be further improved compared to conventional synthetic collagen.

The atelocollagen may be included in an amount of 0.1 to 3 parts by weight, specifically, 0.1 to 2 parts by weight, and more specifically, 0.1 to 1 part by weight, based on 100 parts by weight of the coating polymer. When the content of atelocollagen is less than 0.1 parts by weight or greater than 3 parts by weight, it may not be uniformly mixed with the coating polymer.

The atelocollagen may have an endotoxin content of less than 0.3 EU/ml, for example, 0.1 to 0.3 EU/ml. The purity of the atelocollagen may be 95% or more, for example, 95% to 99.9%. The DNA content in the atelocollagen may be less than 0.001 ng/ml, for example in the range of 0.0005 to 0.001 ng/ml. If the atelocollagen has the above-described characteristics, when applied to a coating solution for color contact lenses, the body's immune response to atelocollagen can be significantly lowered to improve biocompatibility.

The coating polymer may be included in 50 to 95 parts by weight, for example, 50 to 90 parts by weight, specifically, 50 to 75 parts by weight, more specifically, 65 to 70 parts by weight, based on 100 parts by weight of the total coating solution. In addition to the coating polymer, the coating liquid may further include additives such as a polymerization initiator, a viscosity modifier, a pH modifier, a solvent, and a residual amount of purified water.

The coating solution may have a viscosity of 200 cp to 400 cp. The coating solution containing atelocollagen may have a lower viscosity than the conventional coating solution. This may be due to a process of treating atelocollagen with a weak acid to apply it in a stirable form as a polymer.

1 is a flowchart showing a method for preparing a coating liquid for color contact lenses according to an embodiment of the present invention.

Referring to Figure 1, the manufacturing method of the coating liquid for color contact lenses, a first step of pre-treating atelocollagen; A second step of preparing an atelocollagen solution; A third step of preparing a hydroxyethyl methacrylate solution containing hydroxyethyl methacrylate and an acid; A fourth step of preparing a mixture by stirring the atelocollagen solution and the hydroxyethyl methacrylate solution; and a fifth step of adding at least one monomer to the mixture and then polymerizing the mixture to form a coating polymer. includes

Hereinafter, the coating liquid manufacturing method will be described in more detail according to each step.

In the first step, the pretreatment step includes dipping the connective tissue of the collagen raw material in an acid solution to expand the connective tissue (dermis or tendon); Grinding the expanded connective tissue under acidic conditions and then washing to obtain a collagen matrix; extracting collagen from the collagen matrix; includes

More specifically, the connective tissue refers to the pig's dermis or tendon, which is the raw material of atelocollagen. The acid of the acid solution may be formic acid, oxalic acid, acetic acid, citric acid, lactic acid, malic acid, phosphoric acid, or a mixture thereof, and for example, the acid solution may be an acetic acid solution. The immersion may be performed for 20 hours to 28 hours, for example, 24 hours. The immersion may be performed at a refrigerating temperature, for example, in the range of 0 °C to 15 °C to inhibit the propagation of microorganisms. During the immersion, ultrasonic treatment may be performed.

The grinding may be to homogenize the connective tissue by pulverizing the expanded connective tissue using a homogenizer or the like under acidic conditions (PH 3-5). The crushing process can increase the purity of atelocollagen by removing cell nuclei and DNA in atelocollagen and inactivate viruses in collagen to further increase biocompatibility to the human body.

The washing may be washing the homogenized connective tissue in a washing solution containing a detergent, proteolytic enzyme such as pepsin, or a mixture thereof. A collagen matrix may be obtained by removing non-collagenous substances from the homogenized connective tissue by the washing. Ultrasonic treatment may be performed during the washing.

In the step of extracting atelocollagen from the collagen matrix, high-purity collagen may be obtained by subjecting the collagen matrix to salt treatment. The salt may be, for example, sodium chloride or potassium chloride, but is not limited thereto. In the extraction process, at least one filtration may be performed.

The first step, that is, the pretreatment process, can improve the purity of atelocollagen and minimize the immune response, and exhibits an effect of improving the compatibility of atelocollagen and monomers during subsequent polymerization.

The atelocollagen, specifically, the atelocollagen subjected to the pretreatment process may have an endotoxin content of less than 0.3 EU/ml, for example, 0.1 to 0.3 EU/ml. The purity of the atelocollagen may be 95% or more, for example, 95% to 99.9%. The DNA content in the atelocollagen may be less than 0.001 ng/ml, for example in the range of 0.0005 to 0.001 ng/ml. When the atelocollagen has the above-described characteristics, it can exhibit excellent biocompatibility by minimizing the immune response to the human body when applied to a coating solution for color contact lenses.

In the second step, in order to inactivate the enzymatic reaction of atelocollagen that has undergone the pretreatment, a basic solution and distilled water are mixed to raise the pH to about pH 8, reacted for a certain time, and then an acidic solution (HCl solution) is added again. The pH is lowered to about 3 to prepare an atelocollagen solution. Thereafter, the attello collagen solution may be filtered using, for example, a microfilter or the like.

In the third step, the hydroxyethyl methacrylate solution may be a mixture of hydroxyethyl methacrylate in an acidic aqueous solution. The acid of the acidic aqueous solution may be formic acid, oxalic acid, acetic acid, citric acid, lactic acid, malic acid, phosphoric acid, or a mixture thereof, but is not limited thereto. For example, the acidic aqueous solution may be a formic acid aqueous solution.

In the fourth step, a mixture of the atelocollagen solution of the second step and the hydroxyethyl methacrylate solution of the third step is prepared. The mixing may be performed, for example, at 10° C. to 35° C. for 1 hour to 8 hours. The atelocollagen and the hydroxyethyl methacrylate are, for example, 1: 5 to 1: 25, specifically, 1: 15 to 1: 22, in another example, 1: 1.5 to 1: 1: 75, specifically As, 1: 3.5 to 1: 5.5 content ratio can be mixed. The mixing allows the atelocollagen to form a uniform mixture with the hydroxyethyl methacrylate under acidic conditions, so that at the time of polymerization of the coating polymer later, the atelocollagen exhibits excellent compatibility with the monomers This makes it easier to form the coating polymer.

The monomers in the fifth step may be at least one hydrophilic monomer, at least one hydrophobic monomer, or a mixture thereof. The hydrophilic monomer may further improve the hydrophilicity of the coating polymer to be formed later. The hydrophilic monomer is at least one selected from acrylic monomers such as methacrylate (MA), methylmethacrylate (MMA), 2-hydroxyethyl methacrylate, and hydroxypropyl methacrylate, It may be at least one selected from allyl monomers such as allyl alcohol and allyl glycol carbonate, or a mixture thereof. However, it is not limited thereto. For example, the hydrophilic monomer may be a mixture of methacrylate (MA) and methylmethacrylate (MMA).

The hydrophobic monomer is 4-methacryloxy-2-hydroxybenzophenone, ethyl-3 benzoyl acrylate, N-propyl methacrylate, styrene, glycidyl methacryl It may be at least one selected from glycidyl methacrylate and N-butyl acetate. For example, the hydrophobic monomer may be 4-methacryloxy-2-hydroxybenzophenone.

The monomer may be included in an amount of 10 to 50 weight based on 100 weight of the mixture in the fourth step.

The polymerization may be carried out, for example, at 25 °C to 70 °C for 10 minutes to 50 minutes. The polymerization may form a hydrophilic coating polymer for color contact lenses containing atelocollagen. During the polymerization, additives such as a polymerization initiator and a crosslinking agent may be further included.

The coating polymer may include, for example, 50 to 95 weight, for example, 50 to 75 weight, for example, 65 to 70 weight based on the total weight of 100 weight of the coating solution for color contact lenses.

The coating solution for color contact lenses may further include, in addition to the coating polymer, a viscosity modifier, which is an additive included in a conventional coating solution for lenses, and a residual amount of a solvent.

<Color contact lenses>

Figure 2 is a schematic diagram showing the color contact lens of the present invention.

Referring to Figure 2, the color contact lens of the present invention, the lens base layer 30 forming the base of the color contact lens; a printing layer 20 located on the lens base layer and containing a pigment for color implementation; And Positioned on the printing layer, to form a surface in contact with the cornea, the coating layer (10); The coating layer includes a coating polymer of atelocollagen and hydroxyethyl methacrylate, and the attelocollagen is characterized in that it comprises 0.1 to 3 parts by weight based on 100 weight of the coating polymer.

The color contact lens manufacturing method is as follows.

The coating layer may be formed by printing and curing the color contact lens coating solution of the present invention on the surface of a mold in the shape of a contact lens. The printing layer may be prepared by curing after printing an ink composition including a pigment and a dye on the coating layer.

The lens base layer may be manufactured by printing and curing a solution containing a polymer forming the body of the lens on the print layer. The polymer may include, for example, a silicone hydrogel polymer, and specifically, the silicone hydrogel polymer may include a silicone polymer and a hydrophilic monomer.

For example, the silicone polymer may be formed by polymerization of polydimethylsiloxane (PDMS) and dimethylacrylamide (DMA). The mixing ratio of the polydimethylsiloxane (PDMS) and dimethylacrylate (DMA) may be, for example, 1: 1.5 to 1: 2.5, specifically, 1: 1.7 to 1: 2.3, for example, 1: 2. there is. The range of the mixing ratio exerts an effect of increasing the water content and wettability of a lens to be manufactured later.

The hydrophilic monomer may be, for example, 2-hydroxyethyl methacrylate (HEMA). The 2-hydroxyethyl methacrylate (HEMA) polymer has a hydrophilic group, -OH group terminated at its end, so that the moisture content of the formed lens can be further increased.

The hydrophilic monomer may be included in an amount of 1 to 30 weight, for example, 5 to 30 weight, specifically, 12 to 28 weight, for example, 20 weight, based on the total weight of 100 weight of the silicone hydrogel polymer.

When the silicone polymer and the hydrophilic monomer have a mixing ratio within the range described above during polymerization, mechanical properties such as water content, wettability, and tensile strength of the lens may be improved.

The silicone hydrogel polymer is, for example, methylmethacrylate (MMA) methacrylate (Methacrylate, MA), ethylene glycol dimethacrylate (EGDMA) 0 azobisisobutyronitrile (AIBN), 1,1- Dimethyl-2-propynyl)oxy]trimethylsilane (1,1-Dimethyl-2-propynyl)oxy]trimethylsilane), (3-Methacrylamidopropyltris(trimethylsiloxy)silane ), at least one additive selected from the group consisting of tris(2methoxyethoxy)vinylsilane, and vinyltrimethoxysilane.

The additive may be included in an amount of 0.1 to 20 weight, another example, 0.1 to 5.0 weight, and another example, 0.1 to 1.0 weight, based on 100 weight of the silicone hydrogel polymer.

When the additive is blended during the preparation of the silicone hydrogel polymer, mechanical properties such as water content, wettability, and tensile strength of the lens may be further improved.

The visible light transmittance of the color contact lens is 95% or more, for example, 95% to 99.9%, the moisture content is 40% or more, for example, 40% to 55%, specifically, 50% to 55%, and the contact angle is 40º or less, for example, 33º or more to 40º or less, the tensile strength may exhibit physical properties of 0.2 kgf or more, for example, 0.203 kgf to 0.260 kgf.

<Example 1: Preparation of coating solution for color contact lenses>

1. Pretreatment and selection of atelocollagen

Pretreatment

Pork skin was immersed in 0.5M acetic acid at a refrigeration temperature (1 ° C) for 24 hours to swell, and then frozen in a freezer for 1 hour or more. After physically removing fat from pork skin using a knife, washing it with purified water, dehydrating it using a sieve, weighing 500 g, and keeping it frozen for about 3 hours. Then, the pork skin was homogenized by grinding using a homogenizer. After mixing 500 g of homogenized pork skin and 50 L of 0.5M acetic acid, it was stirred for 24 hours under refrigeration (1 ° C.) conditions, and at the same time, 10% pepsine based on the total weight of pork skin was administered and reacted. Next, after harvesting the gelated collagen (collagen matrix) using a centrifuge, it was diluted to 4% while measuring the water content. Thereafter, the container sterilized in a clean bench was sealed so that air from subdivision did not enter.

Then, in order to inactivate the enzyme reaction, the sample was reacted with sodium hydroxide (NaOH) (pH 8) for about 1 hour and then adjusted to pH 3 using HCl. Then, primary filtration was performed using a filter having a pore size of 1.0 μm, and secondary filtration was performed using a filter having a pore size of 0.75 μm. After one more filtration, the sample was placed in a semi-finished product container (SUS tank), and salt (NaCl) was added to coagulate it. After salting out, only pure collagen was taken using the pellet after centrifugation for 1 hour to harvest collagen. Thereafter, the collagen was dialyzed against 20 L of 0.5 M acetic acid under refrigerated conditions (1° C.) to remove NaCl. Collagen that had undergone the dialysis process was diluted 10-fold using 0.5M acetic acid for filtration. Thereafter, 3rd filtration was performed using a 0.45 μm filter and 4th filtration was performed using a 0.22 μm filter. Then, it was concentrated using a filter dedicated to TFF, and the concentrated collagen solution was gelled at pH 4.5 using NaOH.

go. Sorting purity measurement of atelocollagen for color contact lenses

Using the SDS-PAGE method, the high-purity control and atelocollagen according to the examples

Purity was compared.

3 is an image showing the result of measuring the purity of atelocollagen according to Example 1. Referring to FIG. 3, as a result of the test, the thickness and type of protein bands shown through protein separation of the high-purity atelocollagen sample as a control group and the atelocollagen of Example 1 were similar, so that the high-purity attelocollagen sample was compared to the control group. It was confirmed that it was Locollagen.

me. Measurement of DNA and nuclear content

Two groups of 50 g of pork skin from which fat was removed were prepared, and a grinding process was applied in D.W and ascorbic acid environments, respectively. Thereafter, after fixing the sample, DNA quantitative measurement was performed using a DAPI staining method for staining cell nuclei in blue and a Genomic DNA branching kit to quantitatively confirm the remaining DNA concentration.

As a result, in the group subjected to exposure to ascorbic acid and pulverized, all cell components were pulverized and decomposed by acid, so that DAPI reaction was hardly observed. On the other hand, in the group in which pork skin was put in D.W. and ground, a large amount of cell nuclei were confirmed in the ground tissue. Through this test, it can be confirmed that cell nuclei, which are immunoreactive substances, are efficiently removed in the acid grinding step.

On the other hand, about 200 ng / ml of genomic DNA was detected in the group in which pig skin was put in D.W. and ground, and about 0.0005 ng / ml or less in genomic DNA was detected in the group exposed to ascorbic acid and ground. Through this test, it was confirmed that DNA, an immune response material, was efficiently removed in the acid grinding step.

all. Virus inactivation verification test

Six swine-derived viruses (porcine adenovirus: ADV, porcine parvovirus:　PPV, transmissible gastroenteritis virus: TGEV, porcine hamagglutinating encephalomyelitis virus: PHEV, porcine rotavirus: PRoV, pesudorabies virus: PRV) were tested using TaqMan probes to detect contamination. -time PCR was used to detect the DNA of pig-derived viruses pADV, PPV, and PRV, and the RNA of TGEV, PHEV, and PRoV in pig-derived collagen (Q5A ICH guideline and Ministry of Food and Drug Safety Biological Drug Evaluation Guide “Nucleic Acid Amplification Test Verification Guideline”, and performed with a validated TaqMan probe real-time PCR test method).

Figure 4 is a table showing the virus verification test results of atelocollagen according to Example 1. Referring to FIG. 4, in the atelocollagen according to Example 1, porcine-derived viral DNA and RNA were not detected, confirming that it was not contaminated with porcine-derived viruses.

2. Preparation of coating solution

An atelocollagen solution was prepared by mixing 0.5 g of atelocollagen subjected to the above-described pretreatment with 2 ml of a 1 M formic acid solution. Meanwhile, a HEMA solution was prepared by mixing 10 g of hydroxyethyl methacrylate (HEMA) with 5 ml of a 1 M formic acid solution, and then stirred with the atelocollagen solution to prepare a mixture. (At this time, the mixing ratio of HEMA and atelocollagen was 20: 1) Next, hydrophilic and hydrophobic monomers were added to the mixture, stirred, and then 0.7 g of a polymerization initiator and 1 g of a crosslinking agent were added to prepare a coating polymer. In addition to the coating polymer, a solvent and a viscosity modifier were further included to prepare a coating solution for lenses (viscosity: 231 cp).

<Example 2: Manufacturing color contact lenses>

Preparation of silicone hydrogel polymers

Polydimethylsiloxane (PDMS) 1g, dimethylacrylamide (DMA) 2g, hydroxyethyl methacrylate (HEMA) 0.6g, Tris 0.9g, methyl methacrylate (MMA) 0.04g, methacrylate (MA) 0.02g , 0.03 g of ethylene glycol dimethacrylate (EGDMA) and 0.006 g of azobisisobutyronitrile (AIBN) were blended to prepare 4.596 g of a silicone hydrogel polymer (HEMA-Co-urethane-co-polydimethylsiloxane).

Manufacture of colored contact lenses

1 mg of the coating solution prepared in Example 1 was printed on the surface of the ball mold and then cured to prepare a coating layer. Then, 2.1 mg of pigment was printed on the coating layer to prepare a printed layer. Thereafter, a polymer solution containing 1 g of the silicone hydrogel polymer (HEMA-Co-urethane-co-polydimethylsiloxane), 0.62 g of a hydrophilic monomer, and 2.94 g of a hydrophobic monomer was coated on the printed layer, followed by a polymerization process (100 ° C.) , 1 hour) and then cured to prepare a lens base layer.

<Experimental Example: Comparison of physical properties of lenses according to mixing ratio in silicone hydrogel polymer>

The moisture content, refractive index, and wettability of the lenses according to the mixing ratio of the components in the silicone hydrogel polymer were measured and compared.

Table 1 shows the compositions of Preparation Examples 1 to 6 prepared by varying the mixing ratio of DMA to PDMS_A, which is a silicone hydrogel polymer (HEMA-Co-urethane-co-polydimethylsiloxane), and PDMS_B, which is a control group that does not bind urethane, It shows the result of measuring the refractive index and moisture content of the lens manufactured by Preparation Example 1-6. Table 2 shows the composition of Preparation Examples 7 to 12 prepared by varying the content of HEMA.

Referring to Tables 1 and 2, the refractive index increased as the amount of PDMS increased regardless of the synthesis method of PDMS. It was confirmed that PDMS_A had a higher refractive index than PDMS_B. As a result of measuring the moisture content, PDMS_A was 50.47%, 54.79%, and 41.84%, respectively, and PDMS_B was 55.25%, 59.68%, and 48.54%, respectively, depending on the mixing ratio, and it can be confirmed that this is inversely proportional to the refractive index. Among them, in the case of Preparation Example 2, the water content was 54.79% and exhibited excellent physical properties. On the other hand, when HEMA was contained in an amount of 15 to 25 weight, for example, 20 weight based on the total weight of the polymer, the moisture content and wettability were excellent.

<Evaluation example: evaluation of physical properties of color contact lenses>

A physical property evaluation test (visible light transmittance, moisture content, contact angle, and tensile strength measurement test) of the color contact lens prepared in Example 2 was performed. The specific measurement method is described below. In addition, the attello of the prepared color contact lens Endotoxin, purity, DNA content, and degree of cytotoxicity of collagen were measured, and lens comfort (eye irritation, skin sensitization) was evaluated.The results are shown in Table 3 below.

visible light transmittance

Measurements were made using an Agilent Technologies Cary 60. For the test sample, a sufficiently hydrated lens is placed in a measuring cuvette with ISO 18369-3 standard physiological saline solution, and after removing moisture on the surface of the sample using portion Whatman #1 filter paper, UV-B, UV-A and visible light Each area was measured.

moisture content

It was measured using the Gravimetric method based on ISO1869-4: 2006 (Ophthalmic optics-Contact lenses-Part 4: Physicochemical properties of contact lens materials).

contact angle

The contact angle was measured using a contact angle measuring instrument to measure the hydrophilicity of the lens surface. Distilled water at room temperature was dropped on the surface of the sample prepared by the sessile drop method, the spreading angle was measured, and the difference was compared with the average value.

The tensile strength

Tensile strength was measured for contact lens product groups manufactured using a jig with a curvature for contact lenses and a support for contact lenses developed (ASTM).

Referring to Table 3, it can be confirmed that the contact lens according to Example 2 exhibits excellent biocompatibility and excellent physical properties such as tensile strength and water content.

The above description of the present invention is for illustrative purposes, and those skilled in the art can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included in the scope of the present invention.

10: coating layer 20: printing layer
30: lens substrate layer

Claims (4)

Pre-treating atelocollagen;
Preparing an atelocollagen solution containing the pretreated atelocollagen;
Preparing a hydroxyethyl methacrylate solution containing hydroxyethyl methacrylate and an acid;
Preparing a mixture by stirring the atelocollagen solution and the hydroxyethyl methacrylate solution; and
adding at least one monomer to the mixture and then polymerizing to form a coating polymer; Color contact lens coating liquid manufacturing method comprising a. The method of claim 1,
The pretreatment,
Expanding the connective tissue by soaking the connective tissue of the atelocollagen raw material in an acid solution;
Grinding the expanded connective tissue in an acidic condition and then washing to obtain a collagen matrix; and
salt-treating the collagen matrix to extract atelocollagen; Color contact lens coating liquid manufacturing method comprising a. The method of claim 2,
The pretreated atelocollagen,
A method for producing a color contact lens coating solution, characterized in that the endotoxin content is 0.1 to 0.3 EU / ml, the purity is 95% to 99.9%, and the DNA content is 0.0005 to 0.001 ng / ml. The method of claim 1,
In the mixture, the atelocollagen and the hydroxyethyl methacrylate have a content ratio of 1: 5 to 1: 25, characterized in that the color contact lens coating liquid manufacturing method.

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