JP4214870B2 - Method for manufacturing optical article - Google Patents

Description

  The present invention relates to a method for producing an optical article by a cast molding method.

  Examples of the method for producing a plastic lens, which is an optical article, include a casting method, a cutting and polishing method, and an injection molding method. Generally, a casting method that can be easily molded is often used. Yes. In the casting method, two molds having a molding surface are opposed to each other at a predetermined interval, and the outer peripheral surfaces of the two molds are sealed with an adhesive tape coated with an adhesive on a film substrate. A method of forming a plastic lens by polymerizing and curing a raw material composition injected into a plastic lens molding die having an internal space formed by two molds (hereinafter referred to as a tape molding method) is becoming mainstream. .

  On the other hand, plastic lens materials have recently been increased in refractive index, and allyl carbonate resins, acrylate resins, methacrylate resins, and thiourethane resins are widely used. Of these, thiourethane resin compositions are particularly frequently used because a plastic lens having a refractive index of 1.60 or more can be obtained after polymerization and curing. Recently, episulfide compounds have been proposed as resins capable of obtaining a higher refractive index.

  The thiourethane resin is polymerized by mixing a polyisocyanate compound and a polythiol compound as a raw material composition. Moreover, an episulfide type compound polymerizes a compound having at least one episulfide group in one molecule.

  As a method for ensuring the quality of plastic lenses in the casting method, a method for obtaining a plastic lens free from optical distortion by forming the base material of the adhesive tape with a material that defines oxygen transmission rate and water vapor transmission rate as constant values. Is disclosed (for example, see Patent Document 1).

  Further, a method is disclosed in which at least two plastic lens raw materials are mixed, the viscosity of the mixture is increased, and then injected into a molding die to obtain a plastic lens having no striae (see, for example, Patent Document 2). ).

Japanese Patent Publication No. 5-64564 Japanese Patent Laid-Open No. 9-254267

  However, since polymerization of thiourethane resins and episulfide compounds proceeds slowly, in the tape molding method, the adhesive applied to the adhesive tape of the member that seals the outer peripheral surface of the plastic lens molding die during polymerization. The agent is easily dissolved in the raw material composition, causing the polymerized plastic lens to become cloudy, refractive anomaly, and the like, causing deterioration in quality such as appearance and optical performance.

As a result of various experiments, the inventor of the present application has found that the white turbidity of the lens is reduced by raising the curable composition to a predetermined viscosity after the curable composition is injected into the mold.
Then, this invention is made | formed based on this knowledge, and it aims at providing the manufacturing method of a plastic lens (optical article) without a cloudiness in a tape mold method.

In order to solve the above problems, the method for producing an optical article of the present invention is characterized in that a liquid curable composition is formed on a molding die in which an adhesive tape coated with an adhesive on one side is wound around a side surface of a plurality of mold dies. The first step of injecting the composition, and the viscosity of the liquid curable composition in a predetermined temperature range in which the adhesive of the adhesive tape does not dissolve into the liquid curable composition injected into the mold An optical system in which the second step of increasing and the third step of polymerizing the liquid curable composition whose viscosity has been increased in the molding die are performed in the order of the first, second and third steps. A method for manufacturing an article, comprising at least one monitor molding die for viscosity measurement, wherein the first step and the second step are performed, and the monitor molding is performed before the third step. Viscosity to measure the viscosity of the liquid curable composition injected into the mold It characterized by having a constant step.

According to the above method for producing an optical article, a liquid curable composition is injected into a molding die in which a pressure-sensitive adhesive tape coated with an adhesive on one side is wound around the side surfaces of two mold dies and polymerized. In the tape mold method, the polymerization is performed after the step of increasing the viscosity of the liquid curable composition in a temperature range in which the adhesive of the adhesive tape does not dissolve into the liquid curable composition injected into the mold. Thus, a plastic lens with reduced white turbidity can be provided.
In addition, by performing the viscosity measurement step of measuring the viscosity using a monitor mold before moving to the third step, it is possible to provide a plastic lens that more reliably prevents white turbidity due to dissolution of the adhesive on the adhesive tape. can do.

In the method for producing an optical article of the present invention, in the viscosity measurement step, the viscosity measured for the liquid curable composition injected into the monitor mold is greater than or equal to a predetermined viscosity. It shifts to said 3rd process, It is characterized by the above-mentioned.
According to the method for producing an optical article described above, the liquid curable composition injected into the monitor mold can move to the third step after reaching a predetermined viscosity or more, so that the adhesive tape can be more reliably adhered. It is possible to provide a plastic lens that prevents white turbidity due to dissolution of the agent.

The method for producing an optical article of the present invention is characterized in that the liquid curable composition contains an episulfide compound as a main component.
According to the above method for producing an optical article, the curable composition is mainly composed of an episulfide compound, thereby preventing white turbidity due to dissolution of the pressure-sensitive adhesive of the pressure-sensitive adhesive tape, and having a refractive index of 1.7 or more. A plastic lens having a high refractive index can be obtained.

(First embodiment)
A first embodiment of the present invention will be described.
FIG. 1 is a process explanatory diagram for explaining a method of manufacturing a plastic lens according to the present invention.
In the plastic lens manufacturing method of the present invention, a molding die is first assembled (step S11).

In the cross-sectional view of the molding die into which the curable composition shown in FIG. 2 is injected, the molding die MA includes mold dies 1 and 2 made of two glasses forming an optical surface of a lens having a desired curved surface. The adhesive tape 3 is fixed around a peripheral side surface so as to straddle the two mold dies 1, 2 by fixing in advance with a jig or the like so that the interval forms a lens.
In the adhesive tape 3, for example, a silicone adhesive 31 having a thickness of 25 μm is applied to the inside of a tape substrate 30 made of a polyethylene terephthalate biaxially stretched film having a thickness of 50 μm (molding step for forming mold).

Then, a curable composition is injected into the molding die MA (step S12).
In the cross-sectional view of the molding die in the injection step of the curable composition shown in FIG. 3, the curable composition 4 to be polymerized is divided between the two mold dies 1 and 2 to which the molding die MA is fixed. For example, the injection needle 5 connected to a syringe is used to inject from the adhesive tape 3 (composition injection process as the first process).

The injection hole of the injection needle 5 into which the curable composition has been injected is sealed with, for example, a fluororesin tape 6 as shown in the sectional view of the polymerization mold into which the curable composition has been injected as shown in FIG. MB is completed. An external view of this polymerization type MB is shown in FIG.
As the liquid curable composition 4 to be injected, a composition containing one or more polyisocyanate compounds and a polythiol compound as a main component, or an episulfide compound is used. The curable composition 4 will be described in detail in Examples described later.

  Then, the viscosity of the liquid curable composition injected into the polymerization mold MB is increased (step S13).

In this step S13, the viscosity of the liquid curable composition is increased within a predetermined temperature range in which the adhesive 31 of the adhesive tape 3 does not dissolve into the liquid curable composition injected into the polymerization mold MB (first step). Viscosity increasing step as step 2).
In the viscosity increasing step, the polymerization mold MB is placed in an environment of a predetermined temperature range where the adhesive 31 of the adhesive tape 3 does not melt. There is no particular need to place it in an atmospheric polymerization furnace. For example, it may be left in a temperature-controlled room.

Then, the liquid curable composition whose viscosity is increased in the polymerization type MB is polymerized (step S14).
The polymerization type MB is heated in a desired polymerization temperature pattern in an atmospheric polymerization furnace to polymerize and cure the liquid curable composition (polymerization step as a third step).

  Then, after the polymerized mold MB is gradually cooled to room temperature, the adhesive tape 3 is removed, the mold mold 1.2 is removed, so-called mold release (step S15), and a plastic lens is completed.

  First, mold molds 1 and 2 made of two glasses forming an optical surface of a lens having a desired curved surface are fixed with a jig or the like in advance so that the distance between them forms a lens. The molding die MA was assembled by winding and fixing around the peripheral side surface so as to straddle the individual mold dies 1 and 2.

  The curable composition is a polythiol compound pentaerythritol tetra (3-mercaptopropionate) 130 g, a polyisocyanate compound m-xylylene diisocyanate 100 g, a catalyst dibutyltin dichloride 0.023 g, an internal mold release agent 0.23 g, 2 0.15 g of-(2'-hydroxy-5'-t-octylphenyl) benzotriazole was mixed and stirred to obtain a curable composition.

  The viscosity at 20 ° C. at the beginning of the preparation was 30 mPa · s. Further, after deaeration (defoaming) for 30 minutes under a vacuum of 5 mmHg, this curable composition was injected into the molding die MA as a first step.

As a second step, the curable composition (polymerization type MB) was stored at 25 ° C. for 10 hours to increase the viscosity (increased viscosity) in the initial reaction stage.
As the third step, polymerization was carried out by heating the polymerization type MB, to which the injected curable composition was thickened, from 25 ° C. to 120 ° C. over 10 hours in an atmospheric polymerization furnace.

Then, after cooling the polymerization mold MB to room temperature, the mold molds 1 and 2 and the adhesive tape 3 were removed to obtain a sulfur-containing urethane plastic lens having a refractive index of 1.60.
The appearance of the obtained plastic lens was evaluated by applying light from a projector, but no white turbidity due to melting of the adhesive 31 of the adhesive tape 3 could be confirmed.

A molding die MA was assembled in the same manner as in Example 1.
The curable composition injected into the molding die MA is 100 g of norbornane diisocyanate as a polyisocyanate compound, 47 g of pentaerythritol tetra (3-mercaptopropionate) as a polythiol compound, and 4-mercaptomethyl-3 as a polythiol compound. , 6-dithia-1,8-octanedithiol 50 g, catalyst dibutyltin dichloride 0.059 g, mold release agent 0.20 g, UV absorber 2- (2′-hydroxy-5′-t-octylphenyl) 0.099 g of benzotriazole was mixed and stirred to obtain a curable composition.

  The viscosity at 20 ° C. at the beginning of the preparation of the curable composition was 32 mPa · s. Further, after deaeration under a vacuum of 5 mmHg for 30 minutes, as a first step, this curable composition was injected into the molding die MA.

As the second step, the curable composition was stored at 10 ° C. for 6 hours and further at 30 ° C. for 5 hours in the initial reaction stage to increase the viscosity.
As a third step, polymerization was carried out by heating the polymerization type MB to which the injected curable composition was thickened from 30 ° C. to 130 ° C. over 10 hours in an atmospheric polymerization furnace.

Then, after cooling the polymerization mold MB to room temperature, the adhesive tape 3 and the mold dies 1 and 2 were removed to obtain a sulfur-containing urethane plastic lens having a refractive index of 1.60.
The appearance of the obtained plastic lens was evaluated by transmitting light from a projector, but no white turbidity due to melting of the adhesive 31 of the adhesive tape 3 could be confirmed.

A molding die MA was assembled in the same manner as in Example 1.
The curable composition to be injected into the molding die MA is 100 g of polyisocyanate compound m-xylylene diisocyanate and 4,7-bis (mercaptomethyl) -3,6,9-trithia-1,11-undecane of polythiol compound. Dithiol, 4,8-bis (mercaptomethyl) -3,6,9-trithia-1,11-undecanedithiol, 5,7-bis (mercaptomethyl) -3,6,9-trithia-1 , 11-undecanedithiol 98 g, catalyst dibutyltin dichloride 0.012 g, catalyst N, N-dimethylcyclohexylamine 0.012 g, internal mold release agent 0.20 g, UV absorber 2- (2'- 0.099 g of hydroxy-5′-t-octylphenyl) benzotriazole was mixed and stirred to obtain a curable composition.

  The viscosity at 20 ° C. at the beginning of the preparation was 20 mPa · s. Further, after deaeration under a vacuum of 5 mmHg for 30 minutes, as a first step, this curable composition was injected into the molding die MA.

As the second step, the curable composition was stored at 10 ° C. for 15 hours to increase the viscosity in the initial reaction stage.
As a third step, polymerization was carried out by heating the polymerization type MB to which the injected curable composition was thickened from 0 ° C. to 120 ° C. over 10 hours in an atmospheric polymerization furnace.

Then, after the polymerization mold MB was cooled to room temperature, the adhesive tape 3 and the mold dies 1 and 2 were removed to obtain a sulfur-containing urethane plastic lens having a refractive index of 1.67.
The appearance of the obtained plastic lens was evaluated by transmitting light from the projector, but no white turbidity due to dissolution of the adhesive 31 of the adhesive tape 3 could be confirmed.

A molding die MA was assembled in the same manner as in Example 1.
The curable composition to be injected into the molding die MA is an episulfide compound bis- (2,3epithiopropyl) disulfide 90 g, 4,8or4,7or5,7-dimercaptomethyl-1,11-dimercapto-3, After mixing at a composition ratio of 6,9-trithiaundecane 10 g, UV absorber 2- (2-hydroxy-5-methylphenyl) -2H-benzotriazole (trade name Seasorb 701 manufactured by Sipro Kasei Co., Ltd.) is 1 After adding 0.0 g, the mixture was sufficiently stirred to dissolve completely. Thereafter, 0.10 g of N, N-dimethylcyclohexylamine was mixed as a catalyst and stirred well at room temperature to obtain a uniform liquid. As the first step, this curable composition was injected into the molding die MA.

As a second step, the curable composition was stored at 25 ° C. for 3 hours to increase the viscosity in the initial reaction stage.
As a third step, polymerization was carried out by heating the polymerization type MB to which the injected curable composition was thickened from 30 ° C. to 130 ° C. over 10 hours in an atmospheric polymerization furnace.

Then, after cooling the polymerization mold MB to room temperature, the pressure-sensitive adhesive tape 3 and the mold dies 1 and 2 were removed, and annealing was performed by heating at 130 ° C. for 2 hours to obtain a plastic lens having a refractive index of 1.734. .
The appearance of the obtained plastic lens was evaluated by transmitting light from the projector, but no white turbidity due to dissolution of the adhesive 31 of the adhesive tape 3 could be confirmed.
[Comparative Example 1]

In Example 1, a plastic lens was produced without storing the curable composition in the initial reaction stage of the second step at 25 ° C. for 10 hours. All were manufactured by the same process as Example 1 except having omitted the 2nd process.
The appearance was evaluated by transmitting light from the projector to the obtained plastic lens. However, white turbidity due to the dissolution of the adhesive 31 of the adhesive tape 3 was confirmed, and the lens was defective.
[Comparative Example 2]

In Example 2, a plastic lens was produced without increasing the viscosity by storing the curable composition in the initial reaction stage of the second step at 10 ° C. for 6 hours and further storing at 30 ° C. for 5 hours. . All the steps were the same as those in Example 2 except that the second step was omitted.
The obtained plastic lens was evaluated for appearance by transmitting light from the projector. However, white turbidity due to melting of the adhesive 31 of the adhesive tape 3 was confirmed, and the lens was not good.
(Second Embodiment)

Next, a second embodiment of the present invention will be described.
In the second embodiment, a liquid curable composition (injected into the molding die MA using the monitor molding die MM immediately before polymerizing the polymerization die MB is provided). Except that a viscosity measuring step for measuring the viscosity increase state of the polymerization mold MB) is newly provided, it is the same as the first embodiment, and the details of the same step are omitted in the detailed description. To do.

  FIG. 6 is a process explanatory diagram for explaining the plastic lens manufacturing method according to the second embodiment of the present invention.

First, the molding die MA into which the curable composition is injected and the monitor molding die MM are assembled.
The monitor mold MM is assembled with the same structure and method as the mold MA when the mold MA is assembled. The monitor molding die MM is incorporated into at least one desired quantity (molding mold assembling step, step S21).

Then, as the first step, a curable composition is injected into the molding die MA and the monitor molding die MM (composition injection step, step S22).
As a second step, the viscosity of the liquid curable composition injected into the polymerization mold MB and the monitor mold MM is increased (viscosity increase step, step S23).

Next, immediately before the next polymerization step, at least one monitor mold MM is taken out, and the viscosity of the liquid curable composition injected into the mold MM is measured using a viscometer. .
In the viscosity measurement, first, the monitor molding die MM is transferred to a constant temperature bath of 20 ± 1 ° C. to maintain temperature equilibrium. On the other hand, the viscometer circulates constant temperature water at 20 ± 1 ° C. through a DVM-E type rotational viscometer (manufactured by Tokyo Keiki Co., Ltd.) to maintain the temperature equilibrium of the viscosity measuring unit. Then, a part of the adhesive tape 3 of the monitor mold MM is peeled off, and the curable composition in the monitor mold MM is taken out with a syringe. Viscosity is measured by setting 0.4 to 1.2 ml of the curable composition taken out in a measuring cup attached to a viscometer.

  It is determined whether or not the viscosity measurement value is 200 mPa · s or more. When the viscosity is 200 mPa · s or more (YES), the polymerization type MB proceeds to the polymerization step (third step), and the viscosity is 200 mPa · s or less. In the case (NO), the polymerization type MB returns to the viscosity increasing step (second step) again to increase the viscosity of the curable composition. Hereinafter, the viscosity measurement of the curable composition injected into the monitor molding die MM after a predetermined time has elapsed is repeatedly performed until the viscosity measurement value is 200 mPa · s or more (viscosity measurement step, step S24). .

And as a 3rd process, the liquid curable composition which raised the viscosity in superposition | polymerization type | mold MB is superposed | polymerized (a superposition | polymerization process, step S25).
Then, after the polymerized mold MB is gradually cooled to room temperature, the pressure-sensitive adhesive tape 3 is removed, the mold molds 1 and 2 are removed, so-called mold release (step S26), and a plastic lens is completed.

  As described above, according to the plastic lens manufacturing method of the present embodiment, the following effects can be obtained.

(1) The liquid curable composition 4 is injected into a molding die MA in which the adhesive tape 3 coated with the adhesive 31 on one side is wound around the side surfaces of the two mold dies 1 and 2 and fixed. In the tape molding method for polymerization, after the step of increasing the viscosity of the liquid curable composition 4 injected into the molding die MA in a predetermined temperature range in which the adhesive 31 of the adhesive tape 3 does not melt, the molding die MA By performing the step of polymerizing the liquid curable composition 4 injected into the plastic lens, it is possible to provide a plastic lens with reduced white turbidity.

(2) The pressure-sensitive adhesive 31 of the pressure-sensitive adhesive tape 3 is changed to the curable composition 4 by increasing the viscosity of the liquid curable composition 4 injected into the molding die MA in a temperature range of 10 ° C. or higher and lower than 40 ° C. A plastic lens with reduced white turbidity can be obtained without melting.

(3) By increasing the viscosity of the liquid curable composition injected into the molding die MA until the viscosity becomes 200 mPa · s or more, the adhesive 31 of the adhesive tape 3 does not dissolve into the curable composition. A plastic lens with reduced white turbidity can be obtained.

(4) By performing the viscosity measurement step of measuring the viscosity using the monitor molding die MM before moving to the third step, white turbidity due to the dissolution of the adhesive 31 of the pressure-sensitive adhesive tape 3 was prevented more reliably. A plastic lens can be provided.

(5) Since the liquid curable composition injected into the monitor mold reaches a predetermined viscosity or more, the process can proceed to the third step, so that the adhesive 31 of the adhesive tape 3 is more reliably dissolved. A plastic lens in which white turbidity is prevented can be provided.

(6) Since the curable composition 4 is a mixture of a polyisocyanate compound and a polythiol compound, white turbidity due to the adhesive 31 of the adhesive tape 3 being dissolved into the curable composition 4 is prevented, and the refractive index is 1. A sulfur-containing urethane plastic lens having a high refractive index of 60 or more can be obtained.

(7) Since the curable composition 4 is a mixture of a polyisocyanate compound and a polythiol compound having a composition ratio of 5% or more, the composition is sufficiently polymerized and cured, and the adhesive 31 of the adhesive tape 3 dissolves into the curable composition 4. Therefore, it is possible to obtain a high refractive index sulfur-containing urethane-based plastic lens in which white turbidity is prevented.

(8) When the curable composition 4 contains an episulfide compound as a main component, white turbidity due to the adhesive 31 of the adhesive tape 3 dissolving into the curable composition 4 is prevented, and the refractive index is 1.7 or more. A plastic lens having a higher refractive index can be obtained.

In the above embodiments, the polyisocyanate compound for the curable composition to be polymerized includes, besides m-xylylene diisocyanate used in the examples, tolylene diisocyanate, diphenylmethane diisocyanate, polymeric diphenylmethane diisocyanate, tolidine diisocyanate. Art, naphthalene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated diphenylmethane diisocyanate, tetramethylxylylene diisocyanate, tolylene dithiocyanate, diphenylmethane diisothiocyanate, tolidine diisothiocyanate, naphthalene diene Isothiocyanate, hexamethylene diisothiocyanate , Isophorone diisothiocyanate, xylylene diisothiocyanate, 2,5-bis (isocyanatomethyl) bicyclo [2,2,1] heptane, 2,6-bis (isocyanatomethyl) bicyclo [2,2,1] heptane , 3,8-bis (isocyanatomethyl) Torishiro [5,2,1,0 ^2,6] - decane, 3,9-bis (isocyanatomethyl) tricyclo [5,2,1,0 ^2,6] - decane , 4,8-bis (isocyanatomethyl) tricyclo [5,2,1,0 ^2,6] - decane, 4,9-bis (isocyanatomethyl) tricyclo [5,2,1,0 ^2,6] - decane , Polyiso (thio) cyanate compounds such as dimer acid diisocyanate, and allophanate-modified, burette-modified, and isocyanurate-modified products of these compounds. These compounds can be used alone or as a mixture of two or more as required.

  Specific examples of the polythiol compound include di (2-mercaptoethyl) ether, 1,2-ethanedithiol, 1,4 in addition to pentaerythritol tetra (3-mercaptopropionate) used in the examples. -Butanedithiol, ethylene glycol dithioglycolate, trimethylolpropane tris (thioglycolate), pentaerythritol tetrakis (2-mercaptoacetate), 1,2-dimercaptobenzene, xylylenedithiol, 4-mercaptomethyl-3,6 Examples include -dithio-1,8-octanedithiol, and these compounds can be used alone or as a mixture of two or more as required.

  When the plastic lens is cast and molded, the ratio of the polyisocyanate compound and the polythiol compound needs to include 5% or more of the polythiol compound. When the polythiol compound is 5% or less, sufficient curing by polymerization cannot be obtained.

  As the compound having an episulfide group, in addition to the bis- (2,3 epithiopropyl) disulfide used in the examples, an episulfide compound obtained by episulfiding a part or all of the epoxy group of an existing epoxy compound can be used. Can be used. In addition to the episulfide group, a compound containing a sulfur atom in the molecule can be used to increase the refractive index and the Abbe number of the plastic lens.

  Specific examples include bis- (2,3 epithiopropyl) disulfide, 1,2-bis (β-epithiopropylthio) ethane, bis- (β-epithiopropyl) sulfide, 1,3 and 1,4. -Bis (β-epithiopropylthio) cyclohexane, 1,4-bis (β-epithiopropylthiomethyl) benzene, 2,5-bis (β-epithiopropylthiomethyl) -1,4-dithiane, etc. Can be mentioned.

  In addition to internal release agents, UV absorbers and reaction catalysts, chain extenders, crosslinking agents, light stabilizers, antioxidants, disperse dyes, oil-soluble dyes, pigments, and other colorants, blue if necessary An inking agent or the like can be appropriately added to the mixed liquid of the polyisocyanate compound and the polythiol compound.

The figure for demonstrating the manufacturing method of the plastic lens concerning the Example of this invention. Sectional drawing of the shaping | molding die in which a curable composition is inject | poured. Sectional drawing of the shaping | molding die in the injection | pouring process of a curable composition. Sectional drawing of the shaping | molding die in which the curable composition was inject | poured. The external view of the type | mold for polymerization inject | poured the curable composition. The figure for demonstrating the manufacturing method of another plastic lens of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 ... Mold type | mold 3 ... Adhesive tape 4 ... Curable composition 30 ... Tape base material 31 ... Adhesive MA ... Molding type | mold MB ... Polymerization type | mold MM in which curable composition was inject | poured ... Monitor molding type | mold S12 , S22 ... Composition injection step S13, S23 ... Viscosity increasing step S14, S25 ... Second step polymerization step S24 ... Viscosity measuring step as third step

Claims (2)

A first step of injecting a liquid curable composition into a molding die in which an adhesive tape coated with an adhesive on one side is wound around a side surface of a plurality of molds and fixed;
A second step of increasing the viscosity of the liquid curable composition in a predetermined temperature range in which the adhesive of the adhesive tape does not dissolve into the liquid curable composition injected into the mold;
And a third step of polymerizing the liquid curable composition whose viscosity has been increased in a molding die, in the order of the first, second, and third steps .
Liquid curing injected into the monitor mold before the third process is performed by including at least one monitor mold for viscosity measurement and performing the first process and the second process. The manufacturing method of the optical article characterized by having the viscosity measurement process of measuring the viscosity of an adhesive composition . In the manufacturing method of the optical article according to claim 1,
In the viscosity measurement step, when the viscosity measured with respect to the liquid curable composition injected into the monitor mold is greater than or equal to a predetermined viscosity, the process proceeds to the third step. A method for manufacturing an optical article.

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