JPS5874169A - Lens coating method - Google Patents

Abstract

PURPOSE:To prevent a liquid from staying in a boundary line, by supporting the boundary line vertically or by inclining it by 20 degrees or less against the liquid surface of an immersing liquid, and executing the immerse-painting, when immerse-painting a hard coat liquid, etc. to the surface of a plastic lens having the boundary line. CONSTITUTION:Immerse-painting is executed by supporting a plastic lens having a boundary line vertically or so as to be inclined by 20 degrees against the vertical, against the liquid surface of a hard coat liquid or a tarnish-proof coat liquid 2. After that, it is left as it is in the air for 30min, a solvent is scattered, and after that, it is heated at 130 deg.C for 40min, and is hardened. In this way, it is possible to obtain clear-cut lens by which no liquid stays in the boundary line of the lens.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for coating plastic lenses, and more particularly to a method for coating plastic lenses with borders by dipping.

Since the introduction of the PI)A standard in the United States in 1972, the safety of eyeglass lenses has been reconsidered, and inorganic glass lenses have been replaced by synthetic resins, which are safer as lens materials. The shift from inorganic glass lenses to synthetic resin lenses is a global trend, and in Japan, the share of synthetic resin lenses is increasing year by year.In particular, diethylene glycol bisallyl The ratio of lenses made of carbonate (hereinafter abbreviated as 0R-59) resin has already reached 50% in the United States and France.
6.Synthetic resin lenses are expected to be able to withstand many types of damage. Even if they break, they will not break into minute pieces like inorganic glass, and are less likely to cause eye damage. It has many advantages compared to glass, such as being lighter, easier to process, and easier to color. On the other hand, plastic lenses made of synthetic resin materials have drawbacks such as being easily scratched and easily fogged.

In modern times, in order to improve the scratch resistance of plastic lenses with synthetic resin material layers, silicone-based and ataryl-based materials are used.
-Toko) has started to be coated. Furthermore, the tendency of plastic lenses to fog has been solved by applying an anti-fog coating to the lens surface. On the other hand, as the population ages, the demand for double-focal lenses, focal lenses, and trifocal lenses is rapidly increasing, and the same trend holds true for synthetic resin lenses. Accordingly, in the future lens market, there will be a growing demand for multifocal lenses such as bifocal and trifocal synthetic resin lenses that are coated with BARTCO) and ISCO F. These bifocal and trifocal lenses have two or three different lens curves depending on their purpose, so there is a boundary (step) on the lens surface. If a lens is coated by dipping without proper boundary direction, for example, when the dipping is done horizontally to the Deitzbinder liquid level, a problem arises in that the coating liquid accumulates at the lens boundary, as shown in FIG. 1. This liquid pool blurs the image near the boundary between the lenses and obstructs visibility.
(2) In view of the above points, the present invention relates to a method of coating lenses with these boundaries. That is, as shown in FIG. 2, the plastic plate with a boundary according to the present invention is supported with the boundary perpendicular to the liquid level or at an angle of less than 20 degrees to the vertical, and dipping is carried out. By supporting the boundary perpendicularly to the dipping liquid level or at an angle of 20 degrees or less, the dipping liquid flows down smoothly and no liquid pool is formed at the boundary, eliminating the problem of blurred images at the boundary. According to this method,
It is applicable to any type of multifocal lens such as a bifocal lens or a trifocal lens.

The examples described below serve to better explain the invention and are not intended to limit the scope of the invention.

The compositions of the hard coating solution and the antifogging coating solution in the examples are as follows.

t Hazucomito solution (1) Preparation of tetraethoxysilane partial hydrolyzate solution, dissolve 2150 parts by weight of fethoxysilane in 50 parts by weight of isoptabil alcohol, and further add O, OSS.
The mixture was stirred at a normal aqueous hydrochloric acid solution temperature for 10 hours or more.

(2) Preparation of r-glycidoxyp4pyltrimethoxysilane partially hydrolyzed eyelid solution Isopsovir alcohol 13
Hydrolysis was carried out in the same manner as in (1) using 3 parts by weight, 55 parts by weight of r-glycidoxypropyltrimethoxysilane, and 12 parts by weight of a05 normal hydrochloric acid aqueous solution.

A solution obtained by mixing the solutions (1) and (2) at a ratio of 1:1, adding a ring-opening polymerization catalyst at α01 times relative to the total weight of the solution, and mixing and stirring.

2. Anti-fog coating liquid 2- and droxyethyl methacrylate prepolymer 1
8 parts by weight of ethylene glycol methyl ether solution (trade name: Hyde Gastric) was used as a thermoplastic resin matrix, and 15 times of Limeritol was added outside the chemical equivalent to this hard carving component.
Furthermore, a surfactant and Cite polyoxyethylene nonylphenol ether (trade name: Emulgen 950, manufactured by Kao Acillus Co., Ltd.) were added at a weight ratio of 15 to the resin hard carving component.
The arc was combined. A solution made by adding a small amount of cartoluenesulfone as a catalyst to this.

Example t Vista Pi Focal 8 2 B-6s (Banbu BHt
Store product name, Figure 4 a type) Support the lens so that the lens border is perpendicular to the dipping liquid level,
The coating was coated with the 8-decoat solution No. 1 by dipping, and heated in a constant temperature bath at 150° C. for 1 hour to cure.

Further, the anti-fog coating liquid of No. 2 was applied to the same Vista 828-65 lens by dipping while supporting the lens so that the boundary portion of the lens was perpendicular to the dipping liquid level. Thereafter, it was left in the air for 30 minutes to scatter the solvent, and then heated for 40 minutes in a thermostat at 150° C. to be cured.

When we inspected the boundary between the hard-cured lens and the anti-fog lens, we found that there were no liquid pools, and the lens was clear with no blurred images.

Example 2 A Bismet Life Ocal TR Knee 1X (product name of Hattori Watch Store (type b lens in Fig. 4)) lens was supported with the lens border at an angle of 20 degrees to the perpendicular to the Dipinder liquid surface. Then, the hard coat solution No. 1 was coated and cured by the method of Example 1.

In addition, a Vista Tri 7 Ocal TR1-mlX lens was similarly supported using the method described above, coated with the antifogging coating solution of No. 2, and dried and cured using the method of Example 1. When we inspected the boundary between the hard-coated lens and the anti-fog lens after it had hardened, we found that there were no liquid pools and the lens was clear with no blurred images.

[Brief explanation of the drawing]

FIG. 1 is a diagram when the boundary of the lens is supported horizontally with respect to the liquid surface, and FIG. 2 is a diagram of the first lens formed by dipping in the first W1 attitude. Chapter sv! J is a diagram when the lens is supported so that the borderline is perpendicular to the liquid level, and FIG. 4 shows the type of the lens in the example. 1... Lens support part 2... Dipinder liquid 3... Lens 4... Liquid pool (α)... Vista 82B-65 (6)... Vismet Life Ocal TRX-11 or later
Applicant Matsushima Kogyo Kinsha Co., Ltd. Suwa Seikosha Co., Ltd. Agent Patent Attorney Tsutomu Mogami 1 1 Atsushi 1 Group 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A lens coating method characterized in that when coating a plastic lens with a border by dipping, the border is supported perpendicular to the liquid surface or at an angle of less than 2O2 with respect to the vertical.