JP2000326347A - Mold for lens for eye and manufacture of lens for eye using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold for a lens for eye such as contact lens which is excellent in releasability, can display permanently stabilized releasability, and is low in manufacturing cost. SOLUTION: This mold is constituted so that a first mold 2 is registered to a second mold 4, and a molding cavity 6 having a shape to prepare a lens for eye is formed between those molds. Lens for eye is molded by polymerization of a specific polymerizable material in the molding cavity 6. At least either of the first mold 2 and the second mold 4 comprises a glass mold wherein at least molding cavity face 2a part is made of glass material, and surface- treated by a silane compound.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for an ophthalmic lens such as a contact lens or an intraocular lens and a method for manufacturing an ophthalmic lens using the same, and more particularly, to a mold formed by polymerization of a polymerizable material for providing an ophthalmic lens. The present invention relates to a mold that can be suitably used for a molding operation, and an effective method for manufacturing an ophthalmic lens using the mold.

[0002]

2. Description of the Related Art Conventionally, a combination of a first mold and a second mold, such as a combination of a male mold and a female mold or a combination of an upper mold and a lower mold, is performed, and the molds are combined. In between, using a mold for an ophthalmic lens such that a predetermined molding cavity is formed in a shape that gives a target ophthalmic lens such as a contact lens or an intraocular lens, and molding such a mold A technique in which a predetermined polymerizable material is polymerized in a cavity and molded, and then a target ophthalmic lens (polymerized product) is released from such a mold and taken out. It is known as one of the manufacturing techniques for ophthalmic lenses.

[0003] In such a manufacturing method,
When the polymer (ophthalmic lens product), which is a polymerization product obtained by molding, is released from the mold, the polymer serves as an adhesive with the mold. Various measures have been taken to release such a polymer (ophthalmic lens product) because it is difficult to release it.

For example, as one of such measures, a method of applying a release agent to the surface of a mold is disclosed in
No. 1359 discloses a method for facilitating peeling of a produced polymer by immersing a mold obtained by molding and processing a silicone resin in an organic solvent.
Japanese Patent Application Laid-Open No. 9-183131 discloses a method for improving the release characteristics of a produced polymer by applying a surfactant to a mold surface. Release agents such as organic solvents and surfactants are mixed, and there is a risk that such release agents may be included in the ophthalmic lens after molding, and there is a problem in terms of safety. Met.

Further, in Japanese Patent Application Laid-Open Nos. 55-123429 and 3-89314, a predetermined release agent is contained in a monomer mixture (polymerizable material) for providing a polymer. A method of polymerizing in the cavity of the mold has been clarified, but this method poses a problem in terms of safety because the resulting polymer necessarily contains a release agent. This is the same as the countermeasures described above.

Further, there has been proposed a mechanical release method in which an external force is applied to the mold to peel off the formed polymer and the mold at an interface between them and release the polymer.
In Japanese Patent Application Laid-Open No. 8-99370, a polymer produced between two molds constituting a mold is fixed to one mold and heated to give a temperature difference between the molds. Meanwhile, a method of removing the mold by applying a mechanical force has been clarified, and Japanese Patent Application Laid-Open No. 8-174700 discloses that a mold is provided around two molds constituting a mold.
After providing an annular peripheral flange portion and performing molding in a molding cavity formed between the halves, predetermined leverage means is inserted between the annular peripheral flange portions of the halves to separate them. It has been clarified that there is a method in which demolding (release) is performed by applying a force in the direction in which the material is released. However, these mechanical release methods require a large load (force). In addition to,
There is also an inherent problem that the mold itself is damaged, the resulting polymer is damaged, and the yield rate is reduced.

Further, measures to enhance the releasability of the polymer by the material characteristics of the mold have been considered. For example, in Japanese Patent Application Laid-Open No. 61-106211, a mold is made of a predetermined fluorine-based glass. In order to improve the releasability by reducing the adhesive force between the mold and the monomer, a method has been proposed in Japanese Patent Application Laid-Open No. 7-195558. The corona discharge treatment of one of the molding surfaces of the mold outside the optically active area of the contact lens causes the polymerization product (contact lens) to adhere to the mold half on the treated side when the mold is opened. In this way, the method of removing the mold has been clarified.However, in these countermeasures, by forming the mold with an expensive material such as fluorine-based glass,
There is a problem that the lens cost will increase eventually,
In addition, when a treatment such as corona discharge is employed, the number of working steps is increased, and the processing apparatus itself is expensive, which in turn leads to an increase in product cost.

[0008]

Here, the present invention has been made in view of such circumstances, and an object of the present invention is to exhibit excellent releasability and permanently exhibit stable releasability. To provide a mold for an ophthalmic lens, which is inexpensive to produce, and using such a mold,
An object of the present invention is to provide a method for easily and easily manufacturing an objective ophthalmic lens.

[0009]

According to the present invention, in order to solve the problems relating to the molding die as described above, a first die and a second die are combined, and an object is provided between the dies. A molding die configured to form a molding cavity having a shape to provide an ophthalmic lens, and the objective ophthalmic lens is molded by polymerization of a predetermined polymerizable material in the molding cavity. And, at least one of the first and second molds, at least the molding cavity surface portion is made of a glass material, and is constituted by a glass mold which is surface-treated with a silane compound, The gist of the present invention is a mold for an ophthalmic lens to be formed.

Thus, in the mold for an ophthalmic lens according to the present invention, at least one of the first and second molds constituting the mold has at least a molding cavity surface portion made of a glass material. And the surface treatment with the silane compound is used to form a glass type on which the coating layer with the silane compound is formed, so that the coating layer of such a silane compound adheres the polymerization product to the glass type. Is effectively suppressed or prevented, thereby imparting excellent releasability, and effectively releasing the ophthalmic lens, which is a polymerization product obtained by molding, from such a glass mold. Can be done.

Moreover, such a silane compound reacts very effectively and quickly with a glass mold to form a firm coating layer on its surface and impart excellent release properties. Therefore, in addition to having the feature that the work is extremely simple and easy, it can exhibit its excellent mold release performance stably and permanently. As described above, the mold release agent is not simply attached to the mold surface, or is not added to the polymerizable material, but exerts the release property in the coating layer bonded to the mold surface by reaction. However, it is also excellent in terms of safety.

Further, in the present invention, at least one of the two molds constituting the mold is a glass mold,
Since it can be formed of a normal glass material, the mold cost is relatively inexpensive and can be reused, thereby advantageously reducing the mold cost. At the same time, such a glass material is excellent in light transmittance, so that it can exhibit a feature that can effectively promote photopolymerization of the polymerizable material in the molding cavity.

In the present invention, the first mold and the second mold are combined, and a molding cavity having a shape for providing a desired ophthalmic lens is formed between the first mold and the second mold. In such a configuration, by polymerization of a predetermined polymerizable material in the molding cavity, the intended ophthalmic lens is molded into a mold, and the first mold is at least While the molding cavity surface portion is made of a glass material and is formed of a glass mold which is surface-treated with a silane compound, the second mold is a resin mold having at least the molding cavity surface portion made of a resin material. An ophthalmic lens molding die characterized by comprising
This is the gist.

As in the mold structure according to the present invention, the first mold which is one of the two molds constituting the mold is
While the glass mold of the silane compound treatment as described above is used, the other second mold is a resin mold of a predetermined resin material, so that damage to the glass mold during use can be effectively avoided. In addition, when the mold is opened, the mold is opened while the molded ophthalmic lens is always held in the resin mold. This makes it extremely easy to take out the mold from the mold, thereby making it possible to automate the production process and thereby improving the productivity.

According to one preferred embodiment of the mold for an ophthalmic lens according to the present invention, the first mold is a convex mold that provides a molded cavity surface corresponding to a concave surface of the ophthalmic lens. A male mold exhibiting a shape, and wherein the second mold is configured to be a female mold exhibiting a concave shape that provides a molded cavity surface corresponding to the convex surface of the ophthalmic lens; By using the glass mold according to the present invention as the first male mold as the first male mold, the mold can be easily manufactured and the manufacturing cost can be reduced. When the target ophthalmic lens is a contact lens, a mold for molding a front curve, which requires a large number of lens molding surface shapes, is a female mold, and a male mold is for molding a base curve surface of a contact lens. It is only necessary to prepare a limited number of male molds from the point where it is only necessary to do so. Because it becomes.

In the present invention, preferably, at least a surface of the molding cavity of the glass mold is surface-treated with the silane compound to form a coating layer of the silane compound in a thickness of 0.1 nm to 0.1 μm. It is desirable that the glass mold is releasable, thereby effectively releasing the ophthalmic lens (polymerized product) obtained by molding from the glass mold when the mold is opened. It can be realized in

Further, as the silane compound applied to such a glass mold and reacting with the surface thereof to form a coating layer exhibiting effective releasability, chlorosilane, chlorosilane, Those selected from the group consisting of alkoxysilane, silazane, trimethylsilylated acetamide and trimethylsilylated urea will be advantageously used.

The present invention also provides a method for manufacturing an ophthalmic lens using the mold for an ophthalmic lens according to the present invention as described above. As a method of manufacturing, the first mold and the second mold are mold-matched, and a molding cavity having a shape to give an objective ophthalmic lens is formed between the molds, and the molding is performed. In a state where the coating layer of the silane compound is present on the surface of at least one of the molds that form the cavities, the polymerizable material filled in the molding cavities is molded by polymerization to form a mold for the intended eye. After forming the lens,
The gist of the present invention is a method for manufacturing an ophthalmic lens, characterized in that a mold opening is performed and a molded ophthalmic lens is taken out from between the first mold and the second mold. .

That is, according to the method for manufacturing an ophthalmic lens according to the present invention, a glass mold surface-treated with a silane compound is used for at least one of two molds constituting a mold. In a state where a coating layer of a predetermined silane compound is present on the surface of the mold including at least the molding cavity surface of such a glass mold, the polymerizable material is polymerized, and the intended ophthalmic lens is molded. By doing so, strong adhesion of the resulting ophthalmic lens to the glass mold can be effectively avoided,
Thus, the mold release from the glass mold is effectively performed at the time of opening the mold, and such a coating layer of the silane compound is formed by the reaction on the surface of the glass mold. Even by repeated use, the effective mold releasability can be exerted permanently, and an effective ophthalmic lens can be molded safely and inexpensively.

According to a preferred embodiment of the method for manufacturing an ophthalmic lens according to the present invention, light is guided into the molding cavity through the glass mold, and the polymerization filled in the molding cavity is performed. A method in which the conductive material is photopolymerized is advantageously employed. Utilizing the good light-transmitting properties of glass molds, by directing light through such glass molds into the interior molding cavities to allow photopolymerization of the polymerizable material, This allows the polymerization operation to proceed more effectively.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be more specifically described below with reference to the drawings.

FIG. 1 shows an example of a contact lens mold to which the present invention is applied. FIG. 1 (a) shows a male mold 2 and FIG. Female type 4
It is shown. Here, the male mold 2 has a cylindrical shape, and one end surface in the axial direction (the upper end surface in the figure) has a shape protruding in an arc shape or a spherical shape, and corresponds to a base curve of a target contact lens. The female mold 4 has a dish shape as a whole, and has an arc-shaped or spherical concave portion formed on the upper surface thereof. Is formed as a mold having a concave shape that provides a molded cavity surface 4a corresponding to the other surface (here, a front curve) of the contact lens.

The male mold 2 and the female mold 4 as shown in FIGS. 1A and 1B are assembled and matched as shown in FIG. Between them, a molding cavity 6 having a shape for providing a target contact lens is formed. That is, the molding cavity 6 is constituted by a space between the molding cavity surface 2a of the male mold 2 and the molding cavity surface 4a of the female mold 4. And such a male type 2
As is well known, in a molding operation using a mold composed of a female mold 4 and a female mold 4, a predetermined polymerizable material is filled in a molding cavity 6 formed between the molds. After the desired contact lens is molded by polymerization, the mold is opened, and the obtained contact lens is released from the molds 2 and 4 to be taken out.

According to the present invention, at least one of the male mold 2 and the female mold 4 constituting such a mold is replaced with at least a mold cavity surface portion, that is, a mold cavity surface (2a, 4a). In this case, the entirety of the male mold 2 is made of a glass material and is made of a glass material, while the female mold 4 is made of a resin material. It is composed of a resin mold as a material.

In the male mold 2, as long as at least the molding cavity surface 2a is made of a glass material, even if the other part is made of another material such as a resin or a metal, the mold structure may be any one. Also, it can be used as a glass mold, and as a glass material for providing such a glass mold, may be appropriately selected from various commonly used known materials, for example, silicate glass, Examples thereof include borosilicate glass, quartz glass, soda-lime glass, and lead glass.

As described above, by using at least one of the male mold 2 and the female mold 4 as a glass mold made of a glass material, the optical accuracy of a contact lens as an ophthalmic lens obtained by molding is improved. In addition to the feature that it is easy to take out, it has excellent transparency to ultraviolet rays (UV) and the like, and therefore has the feature that the polymerization operation of a polymerizable material in molding can be effectively performed using light. In addition, since the mold can be used repeatedly, the mold economy is excellent, and the surface treatment with the silane compound can be easily performed without any pretreatment. In the molding cavity surface,
A release layer comprising a coating layer of a silane compound can be advantageously formed.

The glass mold (2) is subjected to a surface treatment with a predetermined silane compound so as to include at least the molding cavity surface (2a), and the surface of the glass mold (2) is treated. Reacts with the silanol group (-Si-OH) existing in the glass mold to form a coating layer made of such a silane compound on the surface of the glass mold as a strong layer, so that the excellent release characteristics are permanent. It can be demonstrated in

As the silane compound according to the present invention, various known silane compounds capable of reacting with a glass mold can be used.
_a SiX _(4-a) (where R is hydrogen or an organic group such as a methyl group or a phenyl group, and X is Cl, -OCH ₃ , -O
A hydrolyzable group such as C ₂ H ₅ , and a is an integer of 0 to 3).

Specifically, such silane compounds include chlorosilanes such as methyltrichlorosilane, methyldichlorosilane, dimethyldichlorosilane, trimethylchlorosilane, phenyltrichlorosilane, diphenyldichlorosilane and tert-butyldimethylchlorosilane; Methoxysilane, methyltrimethoxysilane, dimethyldimethoxysilane, phenyltrimethoxysilane, diphenyldimethoxysilane, tetraethoxysilane, methyltriethoxysilane, dimethyldiethoxysilane, phenyltriethoxysilane, diphenyldiethoxysilane, hexyltrimethoxysilane,
Alkoxysilanes such as decyltrimethoxysilane; silazanes such as hexamethyldisilazane; trimethylsilylated acetamides such as N, O- (bistrimethylsilyl) acetamide; N, N- (bistrimethylsilyl)
Examples thereof include trimethylsilylated ureas such as urea.

Such a silane compound easily reacts with a glass mold, and can effectively form a coating layer of such a silane compound on a glass mold surface in a short processing time. Since the glass mold can be instantaneously reacted simply by dipping or contacting it with such a solution of a silane compound, the processing operation (formation of a coating layer) is extremely simple and easy. It has the feature of being easy.

In the surface treatment with the silane compound as described above, the coating layer of the silane compound formed on the surface of the glass mold has an appropriate thickness depending on the purpose. It is desirable that the film be formed in a thickness of 0.1 nm to 0.1 μm. If the thickness of the coating layer is too small, less than 0.1 nm, the effect of improving the releasability cannot be sufficiently expected. If the thickness exceeds 1 μm, problems such as adverse effects on the optical properties of the ophthalmic lens obtained by molding will occur.

Further, another mold (here, a female mold) which is combined with the glass mold (2) surface-treated with such a silane compound to constitute a mold for giving a desired ophthalmic lens. As 4), a mold made of various known materials is used so as to have sufficient rigidity and strength to withstand the molding operation of the ophthalmic lens in the molding cavity.
For example, a mold made of an appropriate material such as metal, glass, and ceramic will be used.However, the mold is not damaged by contact, and when removing the product, avoid adhesion of the product to the glass mold side. In order to enable a constant product to be taken out, it is preferable to form a resin mold having at least a molding cavity surface portion made of a resin material, as shown in the example.

The resin type is generally made of a known material such as polypropylene, polyethylene, polyethylene terephthalate, polystyrene, polycarbonate, polyvinyl chloride, polyamide, polyacetal, and fluororesin. Polyolefins, polyethylene terephthalate and the like are preferably used.

Further, in the present invention, as illustrated in FIGS. 1 and 2, of the male mold 2 and the female mold 4 that provide the first and second molds, respectively, the male mold 2 is replaced with the glass mold. In order to change the lens power when molding a contact lens as an ophthalmic lens using a molding die in which the configuration in which the female mold 4 is a resin mold is advantageously employed, the molding of the female mold 4 is performed. It is necessary to change the curvature of the cavity surface 4a. Therefore, in order to obtain contact lenses having various lens powers, it is necessary to prepare various female molds 4 having different curvatures of the molding cavity surface 4a. This is because a resin mold is more advantageous than a glass mold in manufacturing a large number of female dies 4.

By the way, when a contact lens as an objective ophthalmic lens is molded (polymerized) using a molding die composed of the male mold 2 and the female mold 4 as described above,
For example, a method via a process as shown in FIG. 3 will be adopted.

That is, as shown in FIG. 3, first, a predetermined supply device (not shown) is provided in a recess (molding cavity) formed by the molding cavity surface 4a of the female mold 4.
Is supplied with a predetermined amount of a polymerizable material 8 for providing a polymer constituting a contact lens as an objective ophthalmic lens, and in a state of being accommodated therein, the above-described male mold 2 is replaced with such a female mold. 4 and the cores are aligned and the molds are aligned. As a result, the polymerizable material 8 is placed in the molding cavity 6 (see FIG. 2) formed between the male mold 2 and the female mold 4. It is filled.

Next, after the male mold 2 and the female mold 4 are mold-matched as described above and the polymerizable material 8 is filled in the molding cavity 6 formed between the molds, such a state is obtained. Below, a polymerization operation of the polymerizable material 8 filled in the molding cavity 6 is performed with the help of UV light or heat from a light source or a heat source, so that a desired contact lens is molded. is there. In addition,
Here, since the male mold 2 is a glass mold,
Through such a glass mold, UV light for photopolymerizing the polymerizable material 8 is introduced and irradiated.

The polymerizable material 8 used here may be any of various conventionally known liquid monomer compositions which give a polymer constituting a target contact lens. And, such a monomer composition is generally one or two or more conventionally used radically polymerizable compounds are blended, and is also composed of a macromer or a prepolymer. Even if it is a thing, there is no problem. Further, such a compound has at least one vinyl group, allyl group, acrylic group or methacryl group in the molecule,
Usually, it is a monomer used as a raw material for hard contact lenses, soft contact lenses, and the like. Specifically, alkyl (meth) acrylate, siloxanyl (meth) acrylate, fluoroalkyl (meth) acrylate, hydroxyalkyl (meth) acrylate,
Examples include (meth) acrylic esters such as polyethylene glycol (meth) acrylate and polyhydric alcohol (meth) acrylate, derivatives of styrene, N-vinyllactam, and the like. If necessary, ethylene glycol di (meth) A polyfunctional monomer such as acrylate and diethylene glycol di (meth) acrylate is compounded as a crosslinking agent, and further, necessary polymerization initiators, for example, a heat polymerization initiator, a photopolymerization initiator, and additives such as a sensitizer are compounded. Thus, a liquid monomer composition is obtained.

The polymerization of the polymerizable material 8 comprising such a liquid monomer composition is carried out, for example, according to a usual thermal polymerization method or a usual photopolymerization method. In the case where the polymerization method is adopted, it is necessary to irradiate the polymerizable material 8 with light such as UV light. Therefore, at least one of the two types, that is, the male mold 2 and the female mold 4 is used. Is made of a glass mold made of a glass material that can transmit light, so that light guided through such a mold effectively performs photopolymerization of the polymerizable material 8.

By performing the molding (polymerization operation) of the contact lens in this manner,
The polymerizable material in the molding cavity 6 becomes a polymerization product 10 that gives a target contact lens. After that, by opening the male mold 2 and the female mold 4, the polymerization product 10 and the male The mold release from the mold 2 can be effectively performed by the presence of a coating layer of a predetermined silane compound formed on the molding cavity surface 2a, and the polymerization product 10 is a resin mold female After being separated from the male mold 2 while being attached to the molding cavity surface 4 a of the mold 4, it is further separated from the female mold 4 according to a known method.

Incidentally, such a polymerization product 10 and the female mold 4
For the separation operation, a known chemical or physical method or a mechanical method is appropriately adopted, for example, with an appropriate liquid,
A method such as swelling the polymerization product 10 to separate it from the molding cavity surface 4a of the female mold 4 or deforming the female mold 4 by applying a mechanical force to peel the polymerization product 10 Is adopted.

Further, as described above, by allowing the polymerization product 10 to adhere to only one of the resin molds (4) and opening the mold, the workability in releasing the mold is improved. Has the greatest effect, and in this connection, since the polymerization product 10 adheres to the mold (4) of one fixed material, the peel strength when the polymerization product 10 is detached is Is substantially constant, and it is only necessary to remove the lens with a constant force when the polymerization product 10 is peeled off by, for example, a machine or the like, so that the yield rate can be improved.

According to the molding operation according to the present invention as described above, the polymerization product 10 and the male mold 2 can be released from the mold very effectively due to the presence of the coating layer of the predetermined silane compound. In addition, since such a male mold 2 is a glass mold, the optical accuracy of a contact lens, such as an ophthalmic lens, provided by such a polymerization product 10 can be effectively increased, and the quality thereof can be improved. The coating layer which gives a mold releasing effect and which is present in a state of being bonded to the surface of the glass mold constituting the male mold 2 by reaction is mixed in the polymerization product 10. In addition, it is excellent in safety and can exhibit its release performance for a long time or permanently.

[0044]

Hereinafter, typical examples of the present invention will be described to clarify the present invention more specifically. However, the present invention imposes no restrictions on the description of such examples. It is needless to say that it is not something to receive.

Example 1 First, a mold as shown in FIGS. 1 and 2 was prepared.
That is, after the male mold 2 having the shape shown in FIG. 1A is formed as a glass mold made of optical glass (BK7, manufactured by Schottgrass-Berke, Germany), it includes at least the molding cavity surface 2a. Clean the surface with acetone,
Further, the cleaning surface is contacted with dimethyldichlorosilane as a silane compound to cause an instantaneous reaction, and then the reaction is stopped with distilled water to form a coating layer (thickness) of dimethyldichlorosilane. Sa:
1 nm) was used as a glass mold having at least the molding cavity surface 2a.

The other female mold 4 is shown in FIG.
Was prepared as a resin mold using polypropylene as a material. In addition, such a resin mold as the female mold 4 is manufactured by a normal molding operation or a cutting operation.

Next, as the polymerizable material 8, 100 parts by weight of 2-hydroxymethyl methacrylate, 0.2 parts by weight of ethylene glycol dimethacrylate as a crosslinking agent, and a photoreactive polymerization initiator (2-hydroxy-2-methyl) -1-phenylpropan-1-one): After preparing a monomer solution consisting of 0.2 parts by weight, using 10 molds composed of a combination of the male mold 2 and the female mold 4 as shown in FIG. The recesses (4a) in the female mold 4 of each mold according to the steps shown.
The above-mentioned monomer liquid is accommodated therein, the male mold 2 is overlapped, the male mold 2 (glass mold) and the female mold 4 (resin mold) are matched, and then UV light (main wavelength: 360 nm,
Irradiation intensity: 3 mW / cm ² ) is irradiated from the upper part of the male mold 2 for 1 hour, thereby polymerizing the polymerizable material 8 filled in the molding cavity 6 between the male mold 2 and the female mold 4. As a result, a molding operation was performed to form ten target polymerization products 10.

After the polymerization, the male mold 2 and the female mold 4 of each mold were opened.
Are all held by the resin mold 4, which is excellent in the releasability of the male mold 2, and the polymerization product 10 adhered and held on the resin mold 4 is retained. Could be easily removed from the female mold 4 by performing the hydration treatment.

Further, the male mold 2 used above was used again, combined with the female mold 4 similar to the above, and the molding operation was repeated 10 times in the same manner as above.
In the 0th molding operation, the same effect as in the first molding operation, that is, the polymerization product 10 is effectively released from the male mold 2 at the time of release, and is held by the female mold 4 which is a resin mold. Admitted.

Example 2 A plano-convex type optical glass (trade name: BK7) having a shape as shown in FIG. 1A was washed with acetone and then immersed in a methyltriethoxysilane solution as a silane compound. After the solution was drained, the coating layer was heated at 100 ° C. for 1 hour to form a coating layer (thickness:
10 nm) on at least the molding cavity surface 2a. On the other hand, as a female mold 4 to be combined with the male mold 2, a resin mold having a shape as shown in FIG. 1B was prepared using polypropylene as a material.

The monomer liquid prepared in Example 1 was filled into each of the molding cavities 6 using ten such molding dies comprising the combination of the male mold 2 and the female mold 4. Photopolymerization was carried out in the same manner as described above, and ten polymerization products 10 were molded.

Next, after the polymerization, the mold was opened.
And that the releasability from the male mold 2 was extremely good. Further, the polymerization product 10 held in the female mold 4 could be easily removed from the female mold 4 by performing hydration treatment.

[0053]

As is apparent from the above description, the mold for an ophthalmic lens according to the present invention is excellent in mold releasability of an ophthalmic lens obtained by molding.
A coating layer made of a predetermined silane compound that gives such release properties is firmly fixed and does not release, and therefore does not mix into a polymerization product that provides an ophthalmic lens. Therefore, it has excellent characteristics such as being excellent in safety and capable of exhibiting a releasing effect permanently.

Further, an ophthalmic lens having excellent optical accuracy can be advantageously obtained by molding an ophthalmic lens using a mold having such excellent characteristics. Since the molding die can be used repeatedly, the molding cost such as the mold cost is reduced and the manufacturing cost of the ophthalmic lens can be effectively reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional explanatory view showing an example of a mold for an ophthalmic lens to which the present invention can be applied, wherein FIG. 1 (a) is a cross-sectional explanatory view of a male mold constituting such a mold, and FIG. () Is an explanatory sectional view of a female die constituting such a molding die.

FIG. 2 is an explanatory sectional view showing a state where a male mold and a female mold shown in FIG. 1 are assembled and a molding cavity is formed between the molds.

FIG. 3 is an explanatory view showing a step of molding the target ophthalmic lens by applying the present invention to the mold shown in FIGS. 1 and 2;

[Explanation of symbols]

 2 Male mold 2a Mold cavity surface 4 Female mold 4a recess 6 Mold cavity 8 Polymerizable material 10 Polymerization product

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) // B29K 105: 24 B29L 11:00 (72) Inventor Kenichi Ishihara 5-1-1 Takamoridai, Kasugai-shi, Aichi Prefecture 10 F-term in Menicon Research Institute, Inc. SA00 UA01 UA08 VA04 WA07

Claims (7)

[Claims] 1. The first mold and the second mold are matched,
A molding cavity having a shape giving an objective ophthalmic lens is formed between the molds, and the intended ophthalmic lens is formed by polymerization of a predetermined polymerizable material in the molding cavity. In a mold that is to be molded, at least one of the first and second molds, at least the molding cavity surface portion is made of glass material,
A mold for an ophthalmic lens, comprising a glass mold surface-treated with a silane compound. 2. The first mold and the second mold are matched with each other,
A molding cavity having a shape giving an objective ophthalmic lens is formed between the molds, and the intended ophthalmic lens is formed by polymerization of a predetermined polymerizable material in the molding cavity. While the first mold, at least the molding cavity surface portion is made of a glass material, and a glass mold which is surface-treated with a silane compound, The second mold,
A molding die for an ophthalmic lens, wherein at least the molding cavity surface portion is formed of a resin mold made of a resin material. 3. The method according to claim 1, wherein the first mold is a male mold having a convex shape that provides a molding cavity surface corresponding to the concave surface of the ophthalmic lens, and the second mold is formed on the convex surface of the ophthalmic lens. 3. The mold for an ophthalmic lens according to claim 1, wherein the mold is a female mold having a concave shape that provides a corresponding molding cavity surface. 4. A surface treatment of at least a molding cavity surface portion of the glass mold with the silane compound causes a coating layer of the silane compound to have a thickness of 0.1 nm.
The mold for an ophthalmic lens according to any one of claims 1 to 3, wherein the mold is formed to a thickness of 0.1 m to 0.1 m. 5. The ophthalmic lens according to claim 1, wherein the silane compound is selected from the group consisting of chlorosilane, alkoxysilane, silazane, trimethylsilylated acetamide, and trimethylsilylated urea. Mold. 6. A method for manufacturing a target ophthalmic lens using the mold for an ophthalmic lens according to any one of claims 1 to 5, wherein the first mold and the second mold are provided. And a mold cavity having a shape giving an objective ophthalmic lens is formed between the molds, and at least one mold surface forming such a mold cavity is coated with the silane compound. In the state where the coating layer is present, the polymerizable material filled in the molding cavity is molded by polymerizing the polymerizable material to form a desired ophthalmic lens, and then the mold is opened. Wherein the molded ophthalmic lens is taken out from between the first mold and the second mold. 7. The method for manufacturing an ophthalmic lens according to claim 6, wherein light is guided into the molding cavity through the glass mold, and the polymerizable material filled in the molding cavity is photopolymerized.