JP3084662B2 - Anti-glare hard contact lens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard contact lens having a high antiglare effect.

[0002]

2. Description of the Related Art Originally, spectacle lenses are mainly used for correcting eyesight, but there is also a demand for an effect of protecting eyes from ultraviolet rays and strong light. Glass lenses are examples of spectacle lenses that prevent the glare of strong sunlight and automobile light.
This is because silicate or borosilicate glass is Nd ₂ O ₂
And a glass lens for eyeglasses characterized by using Er ₂ O ₂ (Japanese Patent Publication No. 48-78).
8723, JP-A-53-85813).

[0003] However, at the present time, glass cannot be used for contact lenses in terms of eye safety, and Nd ₂ O ₂ and Er ₂ O ₂ cannot be easily and uniformly introduced with plastics. is there. Therefore, the appearance of a contact lens having the same high anti-glare property as the glass lens has been desired. The most desirable anti-glare effect is between 555 nm, which indicates the highest relative luminosity of the normal naked eye adapted to a bright outdoor state, and 507 nm, which indicates the highest relative luminosity of the normal naked eye adapted to a dark indoor state. To have a reasonable absorption.

[0004]

The problem to be solved is that even a contact lens having the same anti-glare effect as a glass lens, that is, a normal naked eye adapted to a bright outdoor condition. 555n showing the highest relative luminous efficiency
The objective of the present invention is to obtain a plastic contact lens having a corresponding absorption between m and 507 nm, which shows the highest relative luminous efficiency of a normal naked eye adapted to a dark state indoors.

[0005]

SUMMARY OF THE INVENTION The present invention has been made as a result of repeated studies to obtain such a plastic contact lens. That is, after mixing a dye having an absorption in the visible region up to about 560 nm among the oil-soluble dyes in a specific resin monomer described below, a copolymer having an absorption in the visible region is obtained by casting polymerization. By grinding and polishing, a hard contact lens having a high antiglare effect can be obtained.

Hereinafter, the present invention will be described in detail. The dye used in the present invention has an object of the present invention, in which 555 nm showing the highest relative luminosity of the normal naked eye adapted to outdoor bright conditions, and
It has an anti-glare effect by having a corresponding absorption between 507 nm, which shows the highest relative luminous efficiency of the normal naked eye adapted to the indoor dark state, so that it can be used in the visible range up to around 560 nm. It must have a corresponding absorption. Usually organic dyes are said to be not resistant to polymerization initiators. In this sense, a specific resin monomer that is cured until it can be sufficiently ground and polished even under a low-activity polymerization initiator that does not decompose the dye is required.

The dye used in the present invention needs to be an oil-soluble dye in order to dissolve in a specific monomer described below. In addition, any material having absorption in the visible region up to around 560 nm can be used without particular limitation.

The specific monomer used in the present invention is
It is necessary that a radical polymerization initiator having relatively low activity can be easily polymerized and easily ground and polished into a contact lens. In this sense, those in which polymerization undergoes three-dimensional crosslinking are more preferred. Further, since the cured resin is used for a contact lens, it needs to have a composition such that polymerization progresses uniformly optically. In consideration of this, the monomer of the present invention has the following composition.

That is, 50 to 90 parts by weight of methyl methacrylate, 5 to 30 parts by weight of a diacrylic ester (or dimethacrylic ester) represented by the following chemical structural formula (1) ,
3-20 parts by weight of methylstyrene are used. Methyl methacrylate is transparent, optically specific, and the polymerization proceeds well even with a relatively low activity radical polymerization initiator,
In the present invention, it is used as a main component. But this is 9
If the amount exceeds 0 parts by weight, the heat resistance becomes poor and the crosslinking and curing become poor, so that the contact lens may not be able to withstand the heat generated during grinding and polishing. From that meaning 50-90
Parts by weight are used. The monomer of the chemical structural formula (1) is
Since it is bifunctional, the crosslinking effect is remarkable and it is indispensable for grinding and polishing the resin. But this is 30
If the amount exceeds the weight part, the three-dimensional cross-linking proceeds excessively, and the brittleness becomes rather brittle, and grinding becomes impossible. If less than 5 parts by weight,
Lack of grinding and polishing properties. As a good contact lens, 5 to 30 parts by weight is used as a preferable processing range.

[0010]

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In the monomer of the chemical structural formula (1) , R ₁ is C
_The reason why n is an integer of 1 to 3 in the alkyl group of _{4 to} C ₈ or the following chemical structural formula (2) is that if R ₁ is larger than C ₄ , the crosslinking effect tends to proceed too much and the resin becomes brittle. Because it is easy. Conversely, if R ₁ is greater than C ₈ or n is greater than 3, the resin becomes soft and the workability is reduced.

[0012]

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Α-Methylstyrene is an essential component in the present invention so that the polymerization reaction proceeds uniformly. It is used for the obtained resin to have optical uniformity (particularly for removing distortion in the resin). However, if it is used in an amount exceeding 20 parts by weight, the polymer is apt to be unpolymerized. If the amount is less than 3 parts by weight, the resin is likely to be distorted, and in the present invention, 3 to 20 parts by weight is used as a preferable range.

Specific examples of the monomer of the chemical structural formula (1) used in the present invention include butylene glycol diacrylate (dimethacrylate), n-pentene glycol diacrylate (dimethacrylate), and n-octene glycol diacrylate ( Dimethacrylate), diethylene glycol diacrylate (dimethacrylate), triethylene glycol diacrylate (dimethacrylate), and the like, but the invention is not limited thereto.

Next, in the present invention, the oil-soluble dye having absorption in the visible region up to around 560 nm is mixed and polymerized with the monomer composition described above. In the present invention, 0.001 to 8.0 parts by weight of the dye is used per 100 parts by weight of the monomer. If the amount is less than 0.001 part, a good antiglare effect cannot be exhibited, and even if the amount exceeds 8.0 parts by weight, further effects cannot be expected and polymerization may be inhibited. More preferably, a range of 0.05 to 3.0 parts by weight is used.

The monomer composition of the present invention has excellent solubility,
The dye can be uniformly dissolved. The dye and monomer of the present invention mixed and dissolved are added to a radical polymerization initiator and bulk-polymerized into a preferable shape. The radical polymerization initiator is not particularly limited, and a normal radical polymerization initiator is used. Depending on the type, about 30 ° C. to 130 ° C.,
It is heated in a range of about 0 hours and polymerized and molded.

The thus obtained crosslinked copolymer of the present invention has excellent grinding and polishing characteristics, and can be easily processed into a contact lens. The hard contact lens obtained by the present invention is useful because it has absorption near 500 to 550 nm, which shows the highest relative luminous efficiency in dark adaptation and light adaptation, and has an appropriate antiglare effect. Hereinafter, the present invention will be described with reference to examples.

[0018]

EXAMPLES Example (1) Oil-soluble dye (Sumiplast Red FB manufactured by Sumitomo Chemical Co., Ltd.)
After dissolving 0.25 parts by weight in a mixed monomer of 75 parts by weight of methyl methacrylate, 15 parts by weight of triethylene glycol dimethacrylate and 10 parts by weight of α-methylstyrene, and uniformly mixed, as a radical polymerization initiator,
After adding 1.2 parts by weight of lauroyl peroxide and degassing, the mixture was poured into a glass reaction vessel. This was placed in a polymerization furnace and polymerized and cured sequentially at 50 ° C. for 5 hours, 55 ° C. for 5 hours, 60 ° C. for 12 hours, and 100 ° C. for 2 hours to obtain a red crosslinked copolymer. This polymer could be easily ground and polished, and a contact lens having -3.00 diopters, a center thickness of 0.09 mm and an outer diameter of 8.5 mm could be produced. Next, FIG. 1 shows the absorption characteristics of the contact lens in the visible region. That is, in the hard contact lens of the present invention, the absorption thereof shows the highest value of the relative luminous efficiency of a normal eye in light adaptation and dark adaptation.
It has absorption characteristics up to around 500 nm, indicating that the lens has an appropriate antiglare effect.

Example (2) Oil-soluble dye (Sumiplast Red H3G manufactured by Sumitomo Chemical Co., Ltd.)
0.15 parts by weight was dissolved in a mixed monomer of 74 parts by weight of methyl methacrylate, 20 parts by weight of butylene glycol dimethacrylate and 6 parts by weight of α-methylstyrene and uniformly mixed. Then, lauroyl peroxide 1 was used as a radical polymerization initiator. After adding 2 parts by weight and degassing,
It was poured into a glass reaction vessel. This was put into a polymerization furnace, and it was successively stepwise at 50 ° C. for 5 hours, at 55 ° C. for 5 hours,
Polymerization and curing were performed at 60 ° C. for 12 hours and at 100 ° C. for 2 hours to obtain a crosslinked copolymer. This polymer can be easily ground and polished, and a contact lens having a center thickness of -4.00 diopters and a center thickness of 0.1 mm could be easily formed. Next, FIG. 2 shows the absorption characteristics of the spectacle lens in the visible part. That is, the hard contact lens of the present invention
The absorption has absorption characteristics in the vicinity of 550 to 500 nm at which the relative luminous efficiency of a normal eye in light adaptation and dark adaptation is the highest, indicating that the lens has an appropriate antiglare effect.

[0020]

As described above, according to the present invention, 555 nm, which indicates the highest relative luminous efficiency of the normal naked eye adapted to a bright outdoor state, and 555 nm of the normal naked eye adapted to a dark indoor state, according to the present invention. There is an effect that a plastic contact lens having a corresponding absorption between 507 nm, which is the highest, can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing absorption characteristics of a first embodiment according to the present invention, in which the horizontal axis represents wavelength (nm) and the vertical axis represents transmittance (%).

FIG. 2 is a diagram showing absorption characteristics of a second embodiment according to the present invention, in which the horizontal axis represents wavelength (nm) and the vertical axis represents transmittance (%).

Claims (1)

(57) [Claims] 1. 50 to 90 parts by weight of methyl methacrylate, 5 to 30 parts by weight of a bifunctional acrylic ester (or methacrylic ester) represented by the following chemical structural formula (1) ,
In a specified mixed monomer composed of 3 to 20 parts by weight of α-methylstyrene, 0.001 to 8.0 parts by weight of an oil-soluble dye having absorption in a visible region around 560 nm is dissolved, and after casting polymerization, Hard contact lens for anti-glare, obtained by cutting and polishing