JPH07168139A - Contact lens - Google Patents

Abstract

PURPOSE:To obtain a lens such as a moisture absorptive soft contact lens and an oxygen-permeable hard contact lens having moisture absorptivity, fitting feeling and oxygen permeability and excellent in contamination resistance, mechanical strength, workability or the like by incorporating a specific polymer into the lens. CONSTITUTION:This contact lens contains the polymer obtained by polymerizing a polymerizing component containing a cross-linking vinyl monomer (cross- linking vinyl monomer A) expressed by formula. In the formula, each of X and Y is the same or different group and denotes hydrogen atom or methyl group, P represents 0 or 1 and each of (q1) and (q2) denotes integer of 0-3, where, (p)+(q1)+(q2) denotes >=1. And the moisture absorptive soft contact lens containing the polymer obtained by copolymerizing the cross-linking vinyl monomer A and the polymerizing component containing a hydrophilic monomer is obtained. And the oxygen permeable hard contact lens containing the polymer obtained by copolymerizing the cross-linking vinyl monomer A and the polymerizing component containing a hydrophobic monomer is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact lens, and more specifically, to a water-containing soft contact lens, an oxygen permeable hard contact lens, a semi-hard contact lens having excellent antifouling property, workability, mechanical strength and durability. Etc. for a wide variety of contact lenses.

[0002]

2. Description of the Related Art As a contact lens, a water-containing soft contact lens is known which is more comfortable to the eye than a non-water-containing hard contact lens and is excellent in wearing feeling. For this hydrous soft contact lens, 2
A material containing hydroxyethyl methacrylate as a main component is used. This has excellent mechanical strength and workability, but has a water content of 40% or less, and has a drawback that oxygen permeability and wearing feeling are poor. Therefore, in recent years, high water content soft contact lenses have been proposed for continuous wear by increasing the water content of the lens material. For example, N-
There is a copolymer of vinylpyrrolidone as a main component with methyl methacrylate, 2-hydroxyethyl methacrylate or methacrylic acid. However, those containing N-vinylpyrrolidone as a main component have the drawbacks that stains tend to adhere and the strength decreases, and lens processing by cutting and polishing is difficult, and yellowing is caused by repeated sterilization treatment, which is essential for soft contact lenses. There are various problems such as deformation and the problem that the mechanical strength of the lens decreases when the water content is increased.

On the other hand, as a hard contact lens,
Methyl methacrylate has been widely used as a main component, and it has excellent antifouling properties, mechanical strength, wettability, workability, etc., but it has the drawback of hardly permeating oxygen required for corneal physiology. is there. Therefore, recently, in order to impart oxygen permeability, an oxygen permeable hard contact lens containing methyl methacrylate, siloxanyl methacrylate or the like as a monomer main component has been proposed (Japanese Patent Publication No. 52-33502). However, since this oxygen-permeable hard contact lens is inferior in processability and mechanical strength to a hard contact lens containing methyl methacrylate as a main component, it requires careful handling in daily life and inferior durability. There are problems such as.

It is also known that a polymer contains lipophilic silicone, but it is easily contaminated by lipids and proteins in tear fluid. Therefore, fluoroacrylate is added as a means for solving this contamination. Attempts have been made, but the current situation is that they have not been fully resolved.

[0005]

The object of the present invention is to provide a water-containing soft contact lens having water content, a feeling of wearing, oxygen permeability, and further excellent in antifouling property, mechanical strength, processability, and the like. It is intended to provide a contact lens including an oxygen permeable hard contact lens and the like.

[0006]

According to the present invention, a polymer obtained by polymerizing a polymerizable component containing a crosslinkable vinyl monomer represented by the following general formula 4 (hereinafter referred to as crosslinkable vinyl monomer A). A contact lens containing is provided.

[0007]

[Chemical 4]

According to the present invention, there is also provided a hydrous soft contact lens containing a polymer obtained by copolymerizing the crosslinkable vinyl monomer A and a polymerizable component containing a hydrophilic monomer.

Further, according to the present invention, there is provided an oxygen permeable hard contact lens containing a polymer obtained by copolymerizing the crosslinkable vinyl monomer A and a polymerizable component containing a hydrophobic monomer.

The present invention will be described in more detail below.

The contact lens of the present invention contains a polymer obtained by polymerizing a polymerizable component containing the crosslinkable vinyl monomer A represented by the general formula 4. In the crosslinkable vinyl monomer A, the group represented by the following formula 5 in the formula gives the resulting contact lens mechanical strength, processability, light refraction property, etc., and the group represented by the following formula 6 is obtained. Hydrophilicity, flexibility and the like are imparted to the obtained contact lens. Further, the (meth) acrylic group is polymerized and cross-linked with other copolymerized monomers to impart mechanical strength, processability, durability and the like to the obtained contact lens. Therefore, the crosslinkable vinyl monomer A improves the processability, mechanical strength, durability and the like of the obtained contact lens. At this time, if p, q ₁ and q _{2 in the} formula are out of the above ranges, the production is difficult.

[0012]

[Chemical 5]

[0013]

[Chemical 6]

Examples of the crosslinkable vinyl monomer A include those represented by the following chemical formulas 7 to 11 (wherein X represents a hydrogen atom or a methyl machine) and the like. When used, they are used alone or as a mixture. You can

[0015]

[Chemical 7]

[0016]

[Chemical 8]

[0017]

[Chemical 9]

[0018]

[Chemical 10]

[0019]

[Chemical 11]

The crosslinkable vinyl monomer A can be easily prepared by, for example, an esterification reaction between a corresponding epoxy compound and (meth) acrylic acid. In addition, the commercially available product name “Light Ester B”
P-2EM, BP4EA, BP4PA, epoxy ester 3002M, epoxy ester 3002A, epoxy ester 3000M, epoxy ester 3000A "
(Manufactured by Kyoeisha Chemical Co., Ltd.), trade name "Viscoat # 70"
0 "(manufactured by Osaka Organic Chemical Industry Co., Ltd.), product name" BPE1 "
00, BPE200, BPE300, A-BPE-4,
A-BPE-10 "(manufactured by Shin-Nakamura Chemical Co., Ltd.) and the like can be used as they are.

As the polymerizable component constituting the contact lens of the present invention, in addition to the crosslinkable vinyl monomer A, another copolymerizable monomer may be used. Examples of the other copolymerizable monomer include hydrophilic monomers,
Examples thereof include a copolymerizable vinyl monomer containing a hydrophobic monomer and / or a crosslinkable polyfunctional monomer. The copolymerizable vinyl monomer is a component that adjusts the water content of the contact lens to be obtained, oxygen permeability, processability, mechanical strength and the like, and specifically, for example, styrene, methylstyrene, methyl nucleus-substituted styrene, Chloro nucleus-substituted styrene, methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, (meth)
Acrylic acid, (meth) acrylamide, N, N-dimethyl (meth) acrylamide, 2-hydroxyethyl (meth) acrylate, N-vinylpyrrolidone, vinylpyridine, vinyl acetate, vinyl propionate, vinyl pivalate, methyl vinyl ether, ethyl Vinyl ether,
n-butyl vinyl ether, diethyl itaconate, di-n-butyl itaconate, 2-methacryloyloxyethylphosphorylcholine, di-t-butyl fumarate,
Tris-methoxysilylpropyl methacrylate, 2,
2,2-trifluoroethyl methacrylate etc. can be mentioned.

The crosslinkable polyfunctional monomer is a component for improving or adjusting the heat resistance, processability, shape stability and the like of the contact lens, and specifically, for example, allyl (meth) acrylate, ethylene glycol di ( Meta)
Acrylate, diethylene glycol di (meth) acrylate, triethylene glycol (meth) acrylate, tetraethylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate,
1,4-butanediol di (meth) acrylate, divinylbenzene, diallyl phthalate, diethylene glycol bisallyl carbonate, methylene bisacrylamide, triallyl trimellitate, triallyl cyanurate, divinyl adipate and the like can be mentioned.

In the contact lens of the present invention, when the above-mentioned other copolymerizable monomer is used as the polymerizable component, the charging ratio is the crosslinkable vinyl monomer A 100.
20,000 other monomers copolymerizable with respect to parts by weight
To 200 parts by weight is preferable, and a range of 10,000 to 400 parts by weight is particularly preferable. If the amount of the other copolymerizable monomer to be charged exceeds 20,000 parts by weight, the resulting contact lens may have remarkably reduced stain resistance, processability, mechanical strength and heat resistance, and is less than 200 parts by weight. Then, the water content and processability of the contact lens tend to decrease, which is not preferable.

To prepare the contact lens of the present invention, the polymerizable component and the polymerization initiator are mixed and poured into a desired shape made of metal, glass or plastic, such as a test tube or a lens. After sealing, the material for the lens and the lens-shaped product can be obtained by performing polymerization by heating or light. Further, the obtained material can be obtained by a method such as cutting and polishing to obtain a contact lens and hydrating and swelling. In addition, a method of directly forming a contact lens by a cast polymerization method, a method of casting while irradiating with light, and the like can also be carried out. At this time, in addition to the polymer obtained by polymerizing or copolymerizing the polymerizable component, other components may be contained, but the other components are not particularly limited.

As the above-mentioned polymerization initiator, a usual radical polymerization initiator or the like can be used. For example, benzoyl peroxide, diisopropyl peroxydicarbonate, t-
Butylperoxy-2-ethylhexanoate, t-butylperoxypivalate, t-butylperoxydiisobutyrate, lauroyl peroxide, azobisisobutyronitrile, azobis (2,4-dimethylvaleronitrile), benzoin methyl ether , Benzoin ethyl ether and the like. The mixing ratio of the polymerization initiator is
The amount is preferably 10 parts by weight or less, more preferably 5 parts by weight or less, relative to 100 parts by weight of the polymerizable component.

As the conditions of the above-mentioned polymerization reaction, it is desirable to replace the polymerization system with an inert gas such as nitrogen, helium, argon or the like at a suitable time or under an atmosphere. The polymerization temperature is usually different depending on the kind of the polymerization initiator. 20 ~ 140 ℃
It is preferable to carry out the polymerization in the range of about 6 to 120 hours. It is also possible to add a colorant such as a dye or an additive such as an ultraviolet absorber to the polymerizable component for polymerization.

The hydrous soft contact lens of the present invention contains a polymer obtained by copolymerizing a polymerizable component containing the crosslinkable vinyl monomer A and the hydrophilic monomer.

As the hydrophilic monomer, (meth) acrylamide, N, N-dimethyl (meth) acrylamide, 2-hydroxyethyl (meth) acrylate, N-
Examples thereof include vinylpyrrolidone, vinylpyridine, 2-methacryloyloxyethylphosphorylcholine and the like. The blending amount of the hydrophilic monomer is 200 to 20000 with respect to 100 parts by weight of the crosslinkable vinyl monomer A.
It is preferably in the range of 400 parts by weight, particularly 400 to 10,000 parts by weight. If it exceeds 20,000 parts by weight, the stain resistance, processability, mechanical strength and heat resistance of the obtained contact lens will be remarkably lowered, and if it is less than 200 parts by weight, the obtained contact lens will be fragile, and the processability and water content will be low. It is not preferable because it may deteriorate the property.

The hydrous soft contact lens of the present invention can use, as the polymerizable component, the above-mentioned other copolymerizable monomers other than the essential polymerizable component.
Specifically, the same listed monomers other than the hydrophilic monomer can be preferably mentioned.

To prepare the hydrous soft contact lens of the present invention, the specific polymerizable component can be obtained by the same method as the method for preparing the contact lens described above. It is also possible to add a colorant such as a dye or an additive such as an ultraviolet absorber to the polymerizable component for polymerization.

The oxygen permeable hard contact lens of the present invention contains a polymer obtained by copolymerizing a polymerizable component containing the crosslinkable vinyl monomer A and the hydrophobic monomer.

As the hydrophobic monomer, methyl (meth) acrylate, ethyl (meth) acrylate, diisopropyl fumarate, di-t-butyl fumarate, dicyclohexyl fumarate, diisopropyl itaconate, di-t-butyl itaconate, Tris-trimethoxysilylpropyl methacrylate, 2,2,2-trifluoroethyl methacrylate, isopropyl-tris-
Examples thereof include trimethoxysilylpropyl fumarate. The blending amount of the hydrophobic monomer is 200 to 2000 with respect to 100 parts by weight of the crosslinkable vinyl monomer A.
It is preferably 0 parts by weight, particularly 400 to 10,000 parts by weight. If it exceeds 20,000 parts by weight, the workability, mechanical strength, and heat resistance of the obtained contact lens may be remarkably deteriorated. If it is less than 200 parts by weight, the obtained contact lens becomes brittle, and the oxygen permeability and the processing property are high. It is also not preferable because there is a possibility that the property may deteriorate.

In the oxygen-permeable hard contact lens of the present invention, the above-mentioned other copolymerizable monomers other than the above-mentioned essential polymerizable component can be used as the polymerizable component, specifically, a hydrophobic monomer. Other than those listed, similar monomers can be preferably mentioned.

To prepare the oxygen permeable hard contact lens of the present invention, the specific polymerizable component can be obtained by the same method as the above-mentioned method for preparing a contact lens. It is also possible to add a colorant such as a dye or an additive such as an ultraviolet absorber to the polymerizable component for polymerization.

In the present invention, the type of contact lens obtained by appropriately changing the type and amount of the polymerizable component can be arbitrarily selected from a hydrous soft contact lens to an oxygen permeable hard contact lens. Further, the polymer can be used not only as a contact lens but also as an intraocular lens.

[0036]

Since the contact lens of the present invention uses the crosslinkable vinyl monomer A as a polymerizable component, the resulting contact lens is excellent in water content, wearing sensation and oxygen permeability, and further has antifouling property. Excellent mechanical strength and workability. Therefore, it is useful for a wide range of contact lenses, from hydrous soft contact lenses to oxygen permeable hard contact lenses.

[0037]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

[0038]

Example 1 2 g of a trade name “epoxy ester 3000M” (manufactured by Kyoeisha Chemical Co., Ltd.) represented by the following structural formula 12 as a polymerizable component (referred to as compound A in the table),

[0039]

[Chemical 12]

2-hydroxyethyl methacrylate 98
g and 0.2 g of azobisisobutyronitrile as a polymerization initiator were poured into a test tubular glass mold, the system was sufficiently replaced with nitrogen and deaeration was repeated, and the mold was sealed and then heated. Cured. Heating is in a constant temperature room at 40 ° C-12
The temperature was raised to 0 ° C. over 50 hours. After the polymerization was completed, the cured product was taken out of the mold. The polymer was a colorless and transparent material. The obtained polymer is cut and polished by a usual processing method to prepare a water-containing soft contact lens and a test piece with a diameter of 10 mm and a thickness of 0.3 mm, and the water content, oxygen permeability, mechanical strength, and stain resistance. And each measurement of workability was measured by the following methods. The results are shown in Table 1.

(1) Moisture content: After being immersed in 0.9% physiological saline and swollen, the water content was determined according to the following formula. Moisture content (% by weight) = [(W1-W2) / W1] × 100 W1: Weight when saturated water content, W2: Weight when dehydrated and dried of lens (2) Oxygen permeability coefficient; Seikaken film oxygen permeation meter (Rika Seiki Co., Ltd., trade name "K-316IPI
Type ") at 35 ° C. in 0.9% saline. (3) Machinability: Scratches, polishing by ordinary methods,
Evaluation of easiness of cracking and easiness of polishing (○ good, △ normal,
X Bad) I went. (4) Mechanical strength; a) Tensile test of hydrous soft contact lens An array-shaped flat plate with a constricted center was used as a test piece, and 20
The sample was immersed in 0.9% physiological saline at 0 ° C. to make it saturated with water, and then tested at a pulling speed of 60 mm / min. (5) Antifouling property: After immersing the contact lens in a physiological saline solution containing 0.39% by weight of albumin, 0.17% by weight of lysozyme and 0.105% by weight of globulin at 35 ° C. for 2 weeks, After washing with physiological saline, proteins were separated from the contact lenses with a surfactant. A reagent for protein quantification was injected into the separated solution, and the amount of protein adsorbed on the contact lens was measured.

[0042]

Examples 2 to 5, Comparative Examples 1 and 2 A contact lens and a test piece were prepared in the same manner as in Example 1 except that the polymerizable component having the composition shown in Table 1 was used, and the physical properties of the contact lens were measured. . The results are shown in Table 1.

[0043]

[Table 1]

[0044]

Example 6 5 g of a trade name "light ester BP-2EM" (manufactured by Kyoeisha Chemical Co., Ltd.) represented by the following structural formula 13 as a polymerizable component (referred to as compound B in the table),

[0045]

[Chemical 13]

50 g of methyl methacrylate and Tris-
45 g of trimethoxysilylpropyl methacrylate,
Azobisisobutyronitrile as a polymerization initiator 0.0
A mixed solution of 2 g was poured into a test tubular glass mold, the system was thoroughly replaced with nitrogen and deaeration was repeated, and the mold was sealed and then heat-cured. The heating was carried out in a constant temperature chamber from 40 ° C to 120 ° C over 50 hours. After the polymerization was completed, the cured product was taken out of the mold. The polymer was a colorless and transparent material. The obtained polymer is cut and polished by a usual processing method to prepare a hard contact lens and a test piece having a diameter of 10 mm and a thickness of 0.3 mm, which is the same as in Example 1 in terms of oxygen permeability, stain resistance and workability. Was measured, and the mechanical strength was measured by the following method. The results are shown in Table 2.

Mechanical strength; b) Compressive strength test of oxygen permeable hard contact lens: thickness 0.2 mm, diameter 9 mm, base curve 8.00 m
The load at the moment when the contact lens is broken is applied from above and below the contact lens processed into the shape of m, and the load at the moment when the contact lens is destroyed is the product name “Leonar RE330” manufactured by Sanden Co., Ltd.
5 ”.

[0048]

Examples 7 to 10 and Comparative Examples 3 and 4 Hard contact lenses and test pieces were prepared in the same manner as in Example 6 except that the polymerizable components having the compositions shown in Table 2 were used, and their physical properties were measured. . The results are shown in Table 2.

[0049]

[Table 2]

The abbreviations in Tables 1 and 2 indicate the following compounds. HEMA; 2-hydroxyethylmethacrylate NVP; N-vinylpyrrolidone DMAm; dimethylacrylamide MPC; 2-methacryloyloxyethylphosphorylcholine MMA; methylmethacrylate EMA; ethylmethacrylate SiMA; tris-trimethoxysilylpropylmethacrylate SiFu; isopropyl-tris-trimethoxy Silylpropyl fumarate F ₃ MA; 2,2,2-trifluoroethyl methacrylate DtBFu; di-t-butyl fumarate 2GDM; diethylene glycol dimethacrylate 2G; diethylene glycol compound C;

[0051]

[Chemical 14]

Compound D;

[0053]

[Chemical 15]

Claims (3)

[Claims] 1. A contact lens containing a polymer obtained by polymerizing a polymerizable component containing a crosslinkable vinyl monomer represented by the following general formula 1. [Chemical 1] 2. A hydrous soft contact lens containing a polymer obtained by copolymerizing a polymerizable component containing a crosslinkable vinyl monomer represented by the following general formula 2 and a hydrophilic monomer. [Chemical 2] 3. An oxygen-permeable hard contact lens containing a polymer obtained by copolymerizing a polymerizable component containing a crosslinkable vinyl monomer represented by the following general formula 3 and a hydrophobic monomer. [Chemical 3]