JPH07164550A - Manufacture of plastic lens for eyeglasses - Google Patents

Abstract

PURPOSE:To manufacture a plastic lens for eyeglasses having an excellent optical face by sealing an injection opening with an aluminum seal material after a liquid setting compound is injected from the injection opening into a mold. CONSTITUTION:A device for manufacturing a plastic lens for eyeglasses comprises a mold 1, an aluminum seal material supply section 3 and a sealing section 5. The mold 1 comprises a forming mold 11 made of glass or metal and a gasket 12 having a material injection opening made of soft resin. The aluminum seal material supply section 3 supplies an aluminum seal material 4 to the material injection opening attached to the gasket 12. The aluminum seal material 4 is heated by a heater 6 connected to the sealing section 5 and the material injection opening is sealed. The aluminum seal material 4 has a basic structure that an aluminum foil (evaporated aluminum) 22 is sandwiched by an overcoat 21 and a heat seal agent layer 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a plastic lens for spectacles. More specifically, the present invention relates to a method for manufacturing a plastic lens for eyeglasses, which has a good optical surface and is capable of manufacturing a plastic lens with high efficiency and high productivity.

[0002]

2. Description of the Related Art Since plastic lenses are lighter in weight than conventional glass lenses and have excellent impact resistance and dyeability, demand for eyeglass lenses and other demand is rapidly expanding. There is. As a method for forming these plastic lenses by cast polymerization, for example, FIG.
Molding mold (11) made of glass or metal and gasket (12) made of soft resin as illustrated in
The method of using the template (1) consisting of is generally used. Further, when injecting the plastic lens raw material into this mold (1), a method is used in which an inlet is provided in the gasket (12) and the raw material is injected from the inlet.

Conventionally, when a gasket (12) having these inlets is used and casting polymerization of a plastic lens raw material is performed, polymerization is performed with the inlets left open, or sealing is performed with a stopper (10). I was stopping. However, in these methods, liquid leakage occurs due to deterioration of the sealing property, the shape and accuracy of the plastic lens cannot be maintained,
It has been difficult to obtain a plastic lens having a good optical surface. In addition, the work of plugging the inlet (10) is not efficient and is difficult to automate.

The present invention has been made in view of the above circumstances, solves the drawbacks of the prior art, and provides a method for manufacturing a plastic lens for eyeglasses having a good optical surface and an efficient sealing of an injection port. It is intended to provide a way.

[0005]

The present invention is to solve the above problems by injecting a plastic lens raw material into a mold comprising a forming mold and a gasket having a raw material injection inlet through the injection inlet. A method for producing a plastic lens for spectacles, which comprises polymerizing the above, wherein after the raw material is injected into the injection port, the injection port is sealed with an aluminum sealing material.

That is, according to the present invention, after the liquid curable compound is injected into the mold through the injection port, the injection port is sealed with the aluminum sealing material so that the sealing property can be secured, the automation is easy, and the efficiency is high. The lens can be manufactured.
This aluminum sealing material, which is a feature of the present invention, has an overcoat (21) as illustrated in FIG. 2, for example.
It is possible to suitably use a structure having a basic structure in which an aluminum foil (vapor-deposited aluminum) (22) is sandwiched between the heat-sealing agent layer (23) and the heat-sealant layer (23), or an improved product thereof.

As the aluminum sealing material, those used as lid materials for various containers can be used. For example, MP type (MP-3, MP-8, MP-10, etc.) manufactured by Toyo Aluminum Co., Ltd., M type, B
-1 type lid material etc. are mentioned. The sealing is performed by placing an aluminum sealing material on the injection port, pressing a heater to heat, and heat sealing.

A gasket having an injection port is formed into a gasket having a predetermined shape by injection molding, compression molding, or extrusion molding in some cases. The material used for the gasket is not particularly limited, but the soft resin used for conventional plastic lens forming gaskets can be used. Examples thereof include soft resins such as polyethylene copolymers such as ethylene-vinyl acetate resin, ethylene hoethyl acrylate resin, and ethylene-methyl methacrylate resin, polyurethane elastomers, and elastomeric elastomers such as polyolefin elastomers.

[0009]

In the present invention, the plastic lens raw material is injected from the injection port into the mold made of the forming mold made of glass or metal and the gasket having the injection port.
In addition to the resin, a catalyst and, if necessary, known additives such as an ultraviolet absorber, a light stabilizer, and a bluing agent are added to this raw material. After injecting a liquid containing a resin into the mold, the inlet is sealed with an aluminum sealant (heat seal), and polymerization is performed by a method such as heating or ultraviolet irradiation.

As the thermosetting resin for plastic lenses applicable to such a cast polymerization method, a wide range of resins including resins used in conventional plastic lenses can be used. For example, an allyl resin such as diethylene glycol bisallyl carbonate resin,
Examples thereof include (meth) acrylate resins such as methyl (meth) acrylate, polythiols, and polyurethane resins obtained by polymerizing polyol and polyisocyanate.

In order to explain the present invention in more detail,
Examples will be shown below. Of course, the present invention is not limited to these embodiments.

[0012]

EXAMPLE 1 An apparatus for manufacturing a plastic lens for spectacles according to the present invention is illustrated in FIG. This apparatus comprises a mold (1), an aluminum seal supply part (3) and a sealing part (5), and the mold (1) is made of glass or metal for forming mold (1).
1) and a gasket (12) having a raw material inlet (2) made of a soft resin.

The aluminum seal portion (3) has a gasket (1
The aluminum seal material (4) is supplied to the raw material inlet (2) attached to 2), and the aluminum seal material (4) is heated by the heater (6) connected to the sealing part (5),
The raw material inlet (2) is sealed. Example 2 Using the plastic lens manufacturing apparatus for eyeglasses of Example 1, a plastic lens for eyeglasses was actually manufactured.

First, an ethylene-fomethylmethacrylate resin is injection-molded to form a gasket having a predetermined shape having an injection port, and then a mold is made from the formed gasket and two lens-forming molds, and diethylene glycol is used. A plastic raw material consisting of 100 parts of bisallyl carbonate and 3 parts of diisopropyl peroxydicarbonate as an initiator was injected from an injection port. Further, an aluminum seal material MP-3 (manufactured by Toyo Aluminum Co., Ltd.) was placed on the raw material inlet, and a heater heated to 200 ° C. was pressed for 3 seconds for sealing (heat sealing). The airtightness of the aluminum sealant gasket was good.

After sealing the raw material inlet, the temperature was raised from 40 ° C. to 80 ° C. over 20 hours to carry out polymerization. After the polymerization was completed, the lens was taken out of the mold and heat-treated at 120 for 1 hour. From these, the obtained lens had a good optical surface without leakage. Example 3 Using the manufacturing apparatus of Example 1, a plastic lens for spectacles was actually manufactured.

First, an ethylene-fomethylmethacrylate resin (Acryft WH401 manufactured by Sumitomo Chemical Co., Ltd.) was injection-molded to prepare a gasket having a predetermined shape having an injection port. Next, a mold was made from the prepared gasket and two lens-forming molds, and a plastic raw material consisting of 100 parts of diethylene glycol bisallyl carbonate and 3 parts of diisopropyl peroxydicarbonate as an initiator was injected from an injection port.

Further, an aluminum sealing material MP-3 (manufactured by Toyo Aluminum Co., Ltd.) was put on the raw material injection port, and 20
A heater heated to 0 ° C. was pressed for 5 seconds for sealing (heat sealing). The aluminum sealant was applied well to the airtight gasket. After sealing the raw material injection port, the temperature was raised from 40 ° C. to 80 ° C. over 20 hours to carry out polymerization. After the polymerization was completed, the lens was taken out of the mold and heat-treated at 120 for 1 hour.

From these, the obtained lens had a good optical surface without leakage. Example 4 Using the manufacturing apparatus of Example 1, a plastic lens for spectacles was actually manufactured. First, an olefinic elastomer (Milastomer 6030B manufactured by Mitsui Petrochemical Co., Ltd.) was injection-molded to prepare a gasket having a predetermined shape having an injection port.

Next, a mold was made from the prepared gasket and two lens forming molds, and a plastic raw material consisting of 100 parts of diethylene glycol bisallyl carbonate and 3 parts of diisopropyl peroxydicarbonate as an initiator was injected from an injection port. . Furthermore, aluminum sealant MP-3 (Toyo Aluminum Co., Ltd.)
Manufactured) was placed, and a heater heated to 230 ° C. was pressed for 4 seconds for sealing (heat sealing). The airtightness of the gasket made of the aluminum sealing material was good.

After sealing the raw material inlet, the temperature was raised from 40 ° C. to 80 ° C. over 20 hours to carry out polymerization. After the polymerization was completed, the lens was taken out of the mold and heat-treated at 120 for 1 hour. From these, the obtained lens had a good optical surface without leakage. Comparative Example 1 First, an ethylene-fomethylmethacrylate resin (Akulift WH401 manufactured by Sumitomo Chemical Co., Ltd.) was injection-molded to prepare a gasket having a predetermined shape having an injection port.

Next, a mold was made from the prepared gasket and two lens forming molds, and a plastic raw material consisting of 100 parts of diethylene glycol bisallyl carbonate and 3 parts of diisopropyl peroxydicarbonate as an initiator was injected from an injection port. . With the raw material inlet opened, the temperature was raised from 40 ° C to 80 ° C over 20 hours to carry out polymerization. After the polymerization, take out the lens from the mold
Heat treatment was performed for an hour. As a result, bubbles were generated in the obtained lens due to liquid leakage, and a lens having a good optical surface could not be obtained.

Comparative Example 2 First, an olefinic elastomer (Mitsui Petrochemical Co., Ltd.)
(Milastomer 6030B) manufactured by injection molding to prepare a gasket having a predetermined shape having an injection port. Next, make a mold from the created gasket and two lens forming molds,
Diethylene glycol bisallyl carbonate 100
Parts, a plastic raw material composed of 3 parts of diisopropyl peroxydicarbonate as an initiator was injected from an injection port.

Further, a sheet of olefinic elastomer having a thickness of 0.5 mm was placed on the raw material inlet, and a heater heated to 230 ° C. was applied to seal (heat seal). The sheet melted due to the heat at the time of sealing and a hole was opened, and complete sealing was not possible. With the raw material inlet opened, the temperature was raised from 40 ° C to 80 ° C over 20 hours to carry out polymerization. After the polymerization was completed, the obtained lens had bubbles due to liquid leakage, and a lens having a good optical surface could not be obtained.

[0024]

As described above in detail, the method of manufacturing a plastic lens for spectacles of the present invention has the following excellent effects. 1) Since the injection port can be reliably sealed with the aluminum sealing material, there is no liquid leakage due to deterioration of the sealing property, and a plastic lens having a good optical surface can be obtained. 2) Since it is a heat seal using an aluminum sealing material, it can be easily sealed, has high efficiency, and is easy to automate. Therefore, it becomes possible to manufacture a plastic lens with high productivity.

[0025]

[Brief description of drawings]

[0026]

FIG. 1 is a conceptual diagram of a plastic lens forming apparatus according to a conventional method.

[0027]

FIG. 2 is a conceptual diagram showing an aluminum seal material of the present invention.

[0028]

FIG. 3 is a conceptual diagram of a plastic lens forming apparatus using the present invention.

[0029]

[Explanation of symbols]

 1 Mold 2 Raw Material Injecting Port 3 Aluminum Sealing Material Supplying Section 4 Aluminum Sealing Section 5 Sealing Section 6 Heater 7 Plug 11 Molding Mold 12 Gasket with Injection Port 41 Overcoat 42 Aluminum Foil (Evaporated Aluminum) 43 Heat Sealing Agent Layer

Claims (1)

[Claims] 1. A method for producing a plastic lens for spectacles, which comprises injecting a plastic lens raw material through an inlet and polymerizing the plastic lens raw material into a mold formed of a gasket having a forming die and a raw material inlet. A method of manufacturing a plastic lens, comprising pouring a plastic raw material into an inlet and then sealing the inlet with an aluminum sealing material.