JP6585850B2 - Optical element and manufacturing method thereof - Google Patents

Description

  The present invention relates to an optical element in which a functional resin layer is integrated on one side or both sides of an organic glass substrate that is a resin molded body, and a method for manufacturing the same.

  Here, the spectacle lens will be mainly described as an example, but the present invention can be applied to any optical element such as a telescope lens and a window glass for architectural or vehicle use.

  In the present specification and claims, the composition unit is a mass unit unless otherwise specified.

  In addition, abbreviations of main polymers used as the OH component in the present specification are as follows.

PAO: Polyalkylene oxide PEO: Polyethylene oxide (PEG: Polyethylene glycol)
PPO: Polypropylene oxide (PPG: Polypropylene glycol)
EOPO: ethylene oxide propylene oxide copolymer,
EOPO (B): EOPO block copolymer EOPO (R): EOPO random copolymer

  The performance (function) required for the spectacle material (lens) of the optical element includes light control performance (photochromism), ultraviolet absorption performance (specific wavelength absorption performance), and the like. In order for this spectacle material to have dimming performance and specific wavelength absorption performance, it is necessary to include functional drugs such as photochromic agent and specific wavelength absorber in the spectacle material. However, when functional glasses are mixed and contained in the eyeglass material, the consumption of these functional drugs increases and the cost increases. For this reason, a functional resin layer is formed separately from the base material to reduce functional chemicals. And as one of the countermeasures, it can be considered that the spectacle base material and the functional resin layer are integrated through an adhesive layer (see Patent Document 2).

  However, through the adhesive layer, the number of manufacturing steps may increase, and the adhesive layer may affect the optical characteristics and lens appearance (color unevenness, etc.).

  On the other hand, Patent Document 1 proposes a method of manufacturing a resin lens (optical element) in which a functional resin layer is polymerized and adhered by cast molding to be integrated with an organic glass substrate [0005].

  However, in Patent Document 1, as shown in Table 3 “Polymerization Adhesion Test” of the same document, base lens: thiourethane (ne = 1.60), functional resin layer: methyl methacrylate resin (PMMA) (ne = In combination with 1.55), it is difficult to obtain adhesion. In addition, it is difficult to obtain sufficient adhesion even in the case of a combination of a sulfur-containing resin and a base lens: episulfide resin (ne = 1.74) and a functional resin layer: thiourethane (ne = 1.60). The inventors have confirmed (see Patent Documents 2 [0008] and [0009] and [Table 3] described later).

  In addition, regarding the prior application of the basic application 1 and 2 of this application (Japanese Patent Application No. 2016-255420 (28/12/16), PCT / JP2017 / 6188 (20/02/17)), the application was published after the basic application. Patent Document 3 exists. In this document, a methacrylate (M (Ac))-based resin (thermosetting) composition is used as a raw material for the functional resin, and an OH group-containing alkyl (M) Ac monomer is used as a polymerizable component of the composition. The other (M) Ac monomers have been proposed (summary etc.).

  Patent Document 4 describes that, in a thiourethane-based resin composition, a resin modifier can be added for the purpose of adjusting various physical properties including optical properties of the resulting resin and adjusting the handleability of monomers [0038] An alcohol compound can be used as the resin modifier, and examples of the alcohol compound include glycols and oligomers thereof [0062], [0063]. In addition, there is a description in the same document [0088] that “a dye according to the purpose is used for the purpose of imparting photochromic properties”. However, the description and the addition of the alcohols as modifiers include the addition of alcohols (PAO) for improving (increasing) the dimming property (return speed) in the functional resin layer of the present invention. It is not disclosed or suggested.

  That is, for PPG and EOPO related to the present invention, only dimers and trimers of ethylene glycol (EG) and propylene glycol (PG) are exemplified. For example, those having a long ether chain having a molecular weight of 800 or more) are not exemplified, and further, EOPO copolymers having a high molecular weight have dimming characteristics (return speed) and polymerization adhesion. Nothing desirable from the point of view is disclosed or suggested.

  In Patent Documents 2 and 3, as in the present invention, high molecular weight diol (specific POA or specific Mn (number average molecular weight) PPG), mechanical properties and appearance are inhibited in the raw material of the functional resin layer. Without improving the dimming property (return speed) and the polymerization adhesion, it is silent.

Japanese Patent No. 4087335 JP 2014-156067 A JP 2017-40819 A (summary etc.) JP 2008-74957 A

  In view of the above, the present invention provides a novel optical element with improved dimming property (return speed), and further in the case where the functional resin layer is integrated with the organic glass substrate by polymerization adhesion, It is an object of the present invention to provide a novel optical element with improved polymerization adhesion between the two and a method for producing the same.

The present invention is an optical element in which a thermosetting functional resin layer is integrated on one side or both sides of an organic glass substrate that is a resin molded body,
The functional resin layer is formed of a crosslinked polymer of a thiourethane resin composition containing an organic photochromic agent,
The active hydrogen component of the urethane resin in the composition has an SH component as a main component and an auxiliary component as an OH component, and the OH component contains a polyalkylene oxide (PAO) as an accelerator for increasing the return speed of the photochromic agent. It is characterized by doing.

  The method for producing an optical element of the present invention relates to a method for producing the optical element by subjecting a functional resin and an organic glass substrate to polymerization adhesion (crosslinking adhesion) by cast molding.

It is the schematic which shows the manufacturing process of the optical element of this invention. It is the graph which showed the relationship between Mn (number average molecular weight) of EOPO (B) and the return speed in the test example of this invention. It is the graph which showed the relationship between the addition amount of EOPO (B) of specific molecular weight, and return speed similarly. It is the graph which showed the relationship between EO conversion addition amount of EOPO (B), and return speed.

  Hereinafter, an embodiment of the present invention will be described. In the optical element of the embodiment, the functional resin layer 15 is polymerized and adhered to the lens substrate (organic glass substrate) 11 on one or both surfaces (convex surface one surface in the example) of the organic glass substrate 11 which is a resin molded body. It is a spectacle lens (optical element) integrated by (crosslinking adhesion) (see Patent Document 1). However, the present invention is not limited to this configuration, and includes a configuration in which the functional resin layer 15 is integrated with the lens substrate 11 via an adhesive layer.

  The functional resin layer 15 is usually thinner than the organic glass substrate 11 and has a substantially uniform layer thickness. Moreover, it is not limited to the use to the surface (convex surface) of the organic glass base material 11, It is possible to apply also to the back surface (concave surface) or both surfaces (convex surface and concave surface) of the organic glass base material 11.

  (1) As the organic glass substrate 11, polycarbonate (PC), polyurethane, polyurea, aliphatic allyl carbonate (CR), aromatic allyl carbonate, polythiourethane, episulfide, (meth) Synthetic resins such as acrylate, transparent polyamide (transparent nylon), norbornene, polyimide, and polyolefin can be used.

  Specifically, MR-6, MR-8, MR-20, MR-60, MR-95 (Mitsui Chemicals thiourethane resin, ne: 1.60), MR-7, MR-10 ( Mitsui Chemicals, Inc. thiourethane resin, ne: 1.67), MR-174 (Mitsui Chemicals, Inc. episulfide resin, ne: 1.74), NK-11P, LS106S, LS420 (Nippon Shimizu Sangyo Co., Ltd.) (Meth) acrylate resin, ne: 1.56), Iupilon CLS3400 (polycarbonate resin, ne: 1.59) manufactured by Mitsubishi Engineering Plastics Co., Ltd., Grillamide TR XE3805 (nylon resin manufactured by EMS Chemie Japan Co., Ltd.) ne: 1.53), polyurea resin made by NXT (Tribex (ICRX NXT), ne: 1.53) It can be preferably used those which are marketed by the trademark name.

  As a raw material composition of the optical element, a functional drug is basically added to the functional resin layer 15, but a functional drug (a photochromic agent, an ultraviolet ray preventing agent, an anti-deterioration agent) is appropriately added to the organic glass substrate 11. Agents, bluing agents, etc.) may be added.

  (2) Next, the functional resin layer 15 will be described.

  The functional resin layer 15 is formed of a crosslinked product (polymer) of a thiourethane resin material. The active hydrogen component of the raw material contains an OH component together with the SH component, and the OH component contains polyalkylene oxide (PAO) as an accelerator for increasing the return speed of the photochromic agent (light control agent). .

  A photochromic agent, an ultraviolet absorber, a deterioration inhibitor, a bluing agent, and the like may be added to the organic glass substrate 11 as appropriate.

  The reason why the thiourethane resin is used as the resin for forming the functional resin layer is as follows.

  For example, in the case of a urethane resin, the surface hardness is small and the heat distortion temperature is low as compared with a thiourethane resin. For this reason, the temperature cannot be increased too much during the formation of the hard coat, and an increase in surface hardness cannot be expected. That is, it is difficult to obtain a hard coat having excellent scratch resistance on the surface of the functional resin layer.

  In Patent Document 3, the functional resin is formed of (M) Ac-based resin. However, there is a drawback that it is fragile, and cracks may occur during drilling.

  The thiourethane resin means a polymer (resin) having a bond (-NHCOS-, -NHCSO-, -NHCSS-) in which at least one oxygen atom of a urethane bond (-NHCOO-) is replaced with a sulfur atom. .

  The resin raw material (polymer constituent raw material) functionally includes a cyanate component and an active hydrogen component, and the active hydrogen component includes an SH component and an OH component.

  Here, the cyanate component is usually a divalent NCO from the viewpoint of reactivity and availability, but may be a trivalent or tetravalent NCO, or a bivalent to tetravalent NCS.

  The active hydrogen component is usually composed mainly of tri- and tetravalent SH when the isocyanate component is divalent NCO. These tri- and tetravalent SHs may be based on a sulfide, polysulfide, or thiocarbonyl (thioketone) derivative in which sulfur is introduced into a part of the carbon chain.

  These cyanate component and SH component may be aromatic, but from the viewpoint of yellowing resistance, saturated aliphatic and alicyclic systems are desirable.

  Specific cyanate components are described, for example, in [0039] to [0044] of Patent Document 4 and in the same [0045] to [0050] as NCS components.

  Among these, as described in [0051], 2,5- or 2,6- (isocyanatomethyl) bicyclo [2,2,1] heptane (commonly known as norbornene diisocyanate: abbreviation NBDI), m -Xylylene diisocyanate (abbreviation MXDI), hexamethylene diisocyanate (abbreviation: HDI), hydrogenated phenylmethane diisocyanate (abbreviation: hydrogenated MDI), 1,3- or 1.4-bis (isocyanatomethyl) cyclohexane Etc. (both bifunctional) are desirable.

  Specific SH components are described in, for example, [0052] to [0060].

  Among these, pentaerythritol tetrakis (3-mercaptopropionate) (abbreviation PEMP), 4,7-, 5,7- or 4,8-bis (mercaptomethyl) -3,6,9-trithiaundecane -1,11-dithiol (abbreviation: BMTU) (above, tetrafunctional) and 4-mercaptomethyl-3,6-dithia-1,8-octanedithiol (abbreviation: MDOD) (trifunctional) are desirable. In particular, tetrafunctional compounds are desirable because they are easy to obtain (hard) having a high crosslinking density.

  Here, NCO / SH in the polymer basic composition of the thiourethane resin is preferably 1.01 to 1.3, more preferably 1.05 to 1.2. When NCO / SH is too small, coloring unevenness at the time of ultraviolet irradiation, adhesion, and lens distortion are affected. On the other hand, if NCO / SH is excessive, light resistance is deteriorated.

  PAO, which adds the active hydrogen component of the thiourethane resin that forms the functional resin layer, which is the feature of the present invention, as a 0H component together with the SH component, suppresses the cloudiness phenomenon caused by the inclusion of the photochromic agent. However, it is not particularly limited as long as it has an effect of increasing the dimming speed (returning speed) and further increasing the polymerization adhesion (see test examples described later). That is, various PAOs (including EO and PO adducts of bisphenol A and pentaerythritol) described in the basic applications 1 and 2 of the present invention can be used. Furthermore, monovalent polyethers such as methyl-capped polyethers and allylated polyethers can also be used. This is because, as will be described later, the chain length of the polyether chain (POE) is considered to affect the dimming property (return speed).

  Of these, the PAO having the structure shown below is desirable because it has a large return speed increasing action, an excellent suppressive action on the white turbidity phenomenon, and excellent polymerization adhesion. From the test examples described below, the PAO has a higher molecular weight and the EOPO block copolymer has a greater effect. From this, it can be seen that the length of the ether chain (particularly nonpolar ethylene ether) and the OH reactivity (primary OH of PEO and PPO is mostly secondary OH) have an influence on these functions.

  The PAO is an EOPO block copolymer (EOPO (B)) (1) or a random copolymer (EOPO (R)) (2) represented by the following structural formula, and Mn: 1.5000 to 20,000 The following is desirable. There is a possibility that it can be used in excess of 20,000, but there is no commercial product, the viscosity is likely to increase, and there is a problem in handling properties and moldability when casting a thin functional resin layer (for example, 1 mm or less) May occur.

_{HO- (C 2 H 4 O)} n1 - (C 3 H 6 O) m - (C 2 H 4 O) n2 -H ··· (1)
_{HO- (C 2 H 4 O)} n1 -ran- (C 3 H 6 O) n2 -H ··· (2)
In addition, other polyols, for example, a phenol skeleton polyalkylene glycol obtained by addition polymerization of PO or EO to bisphenol A, or a polyalkylene glycol having a lower molecular weight can be used in combination.

  Here, the number average molecular weight (Mn) of EOPO (B) is 1.5 thousand or more, desirably 3,000 or more, and more desirably 10,000 or more. When Mn is less than 1.5 thousand, it is difficult to increase the return speed (return speed = transmittance after 15 minutes of irradiation / transmittance after 2 minutes of irradiation stop) by 1.1 times or more (Test Example No. 10).

  The higher the molecular weight, the smaller the amount added to obtain a lens with a predetermined return speed. (See FIG. 2). For this reason, there is little fluctuation | variation with respect to NCO / (SH + OH) in the basic composition of a functional resin layer, and there is also little fluctuation | variation from a polymer composition from a basic composition, and the resin composition design of stable quality is attained.

That is, the larger the Mn of PAO, the easier it is to obtain 10% or higher return speed: 0.50 or less, desirably 0.30 or less, with a small amount of addition, compared to the thiourethane resin without addition of PAO (see FIG. 2.3). Further, when 15 parts or more of 12,000 or more are added, further increase in polymerization adhesion can be expected ([Table 1] Test Example No. 3).
The addition amount of PAO at this time is 1.5 to 17 parts, preferably 2 to 15 parts (refer to Table 1 and FIG. 4) in terms of EO equivalent addition amount (= PAO addition amount × EO content%). . FIG. 4 shows the test results for EOPO (B), but similar test results are predicted for EOPO (R) (see Table 2).

  Here, the EO content of the EOPO copolymer is preferably 30% or more, and more preferably 35% or more. If it is 30% or less, white turbidity may occur in the functional resin layer (see Table 1).

  In the case of PPG (Mn: 1,000), the EO content is 0%, but if the addition amount is small, white turbidity occurs ([Table 3] Test Example No. 26). Further, in the case of PEG (Mn: 1,000), the EO content is 100%, but even when 20 parts are added, it becomes cloudy ([Table 3] Test Example No. 30). These reasons are unclear and are derived from the test results.

  Next, the desirable aspect of the manufacturing method of the optical element of this invention is demonstrated.

  In the cavity 21 in which the functional resin layer 15 is provided, the organic glass substrate 11 is the first mold 13, and the second mold 17 is arranged so that a certain gap is formed outside the first mold 13. A gap between the peripheral surfaces of the mold 13 and the second mold 17 is formed by sealing with a taping 19 or the like. By using the same mold as that used for forming the organic glass substrate 11 as the second mold 17, the functional resin layer 15 can have a certain thickness.

  The gap between the cavities 21 where the functional resin layer 15 is provided is set according to the flow characteristics of the functional resin and the functionality required for the functional resin layer 15. Usually, it is preferably 0.2 to 2.5 mm, 0.3 to 1.5 mm, and more preferably 0.4 to 1.0 mm. If the material is too thin, it may be difficult to inject the resin when using a material with high viscosity, and molding defects may occur. If the material is too thick, striae may occur due to uneven curing of the functional resin. Here, “striae” means “a flaw of transparent plastic that has a refractive index different from that of the plastic body and is visible on the surface or inside.” (Shin Ogawa, “Eiwa Plastic Industry Dictionary” Industrial Survey (Issued in 1973).

  The optical element has a polarizing film provided on the side of the organic glass substrate 11 provided with the functional resin layer 15 and a polarizing film provided between the organic glass substrate 11 and the functional resin layer 15. It can also be an optical element having properties. The polarizing film is preferably composed of polyvinyl alcohol. This is because polyvinyl alcohol ensures the adhesion between the organic glass substrate 11, the polarizing film and the functional resin layer 15 by the isocyanate compound contained in the functional resin layer 15. The thickness of the polarizing film is preferably 10 to 50 μm. This is because the polarizing film has elongation characteristics that follow the curved surface of the optical element while having polarization characteristics.

  In addition, the organic glass substrate 11 (optical element) on which the functional resin layer 15 is formed generally has a hard coat process, an antifogging process, an antireflection process, a water repellent process, and an antistatic process. General-purpose surface treatment such as processing can be appropriately performed.

  Hereinafter, the present invention will be described in more detail with reference to examples.

(1) Molding of organic glass substrate:
The convex mold and the concave mold were faced with a gap and sealed with an adhesive tape to prepare a mold having a cavity for molding an organic glass substrate. The specifications of the cavity were as follows: center gap: 1 mm, outer diameter: 86 mm, convex curvature: 125 mm, concave curvature: 84 mm.

The organic glass substrate 11 used was as follows.
About (i)-(iii), the resin raw material (commercial item) of each following refractive index was prepared according to prescription, this resin raw material was inject | poured into the said shaping | molding die, and it heat-hardened on each following conditions, and prepared. For (iv) to (vi), commercially available molded products were used.

(i) Thiourethane resin ... ne: 1.60, 120 ° C x 2h
(ii) Episulfide resin ... ne: 1.74, 120 ° C x 2h
(iii) Methacrylate resin ne: 1.56, 80 ° C x 1h
(iv) Nylon resin ... ne: 1.53 Commercial injection molded product
(v) Polycarbonate resin: ne: 1.59 Commercial injection molded product
(vi) Polyurea resin ... ne: 1.53 Commercial cast molding (2) Molding of functional resin layer Each composition of thiourethane resin forming functional resin layer 15 is shown in Tables 1-3.

  The relationship between abbreviations and compound names in each table is as follows.

<NCO component>
NBDI: (2,5) -bis (isocyanatomethyl) bicyclo [2,2,1] heptane,
Molecular weight 208 (divalent, NCO equivalent: 104)
HDI: hexamethylene diisocyanate,
Molecular weight 168 (divalent, NCO equivalent: 84)
-H12MDI: cyclohexylmethane-4,4'-diisocyanate,
Molecular weight 262 (divalent, NCO equivalent: 132)
MXDI: meta-xylene diisocyanate,
Molecular weight 188 (divalent, NCO equivalent; 94)
<SH component>
PEMP: pentaerythritol tetrakis (3-mercaptopropionate),
Molecular weight: 488 (tetravalent, SH equivalent: 122)
BMTU: 4,7 (5,7 or 4,8) -bis (mercaptomethyl) -3,6,9-trithiaundecane-1,11-dithiol,
Molecular weight 366 (tetravalent, SH equivalent: 91.5)
<OH component>
For the indicated block copolymer or random copolymer, EO% was also shown together with the average molecular weight of Mn.

  As the functional drug, a photochromic agent and a specific wavelength absorber were used. The photochromic agent was blended with a commercially available spiropyran or spirooxazine. A commercial product having an absorption peak wavelength (585 nm) was used as the specific wavelength absorber.

  The functional resin raw material is mixed in such a way that the total amount of the NCO component, SH component and OH component is 100 parts in accordance with the indicated prescription, and the photochromic agent: 0.05 parts, specified with respect to 100 parts of the resin (polymer) component Wavelength absorbers and other additives (molecular weight adjusting agent, curing agent, etc.) 0.015 part were mixed and mixed and stirred for 1 hour while adjusting the temperature to 15 ° C. in a nitrogen gas atmosphere.

  Subsequently, each functional resin raw material for forming the functional resin layer 15 was prepared by degassing for 1 hour while stirring at a liquid temperature of 15 ° C. and 133 Pa using a vacuum pump to form a functional resin layer 15 by filtration through a 1 μm filter.

  In Tables 1 and 3, the corresponding composition numbers in the basic application (Japanese Patent Application No. 2016-255420, PCT / JP2017 / 6188) are given.

  As shown in FIG. 1, casting molding of the functional resin layer 15 onto the organic glass base material (lens base material) 11 forms a mold cavity 21 in the organic glass base material 11, and the functional resin layer 15. A functional resin raw material for molding was injected and cured by heating.

  The design gap of the cavity 21 was a uniform gap of 0.8 mm at the center and the outer periphery.

  Thus, the semi-lens (semi-finished product) prepared by polymerizing and sticking the functional resin layer 15 to the organic glass substrate 11 was cut and polished on the concave surface and the outer periphery to obtain a product lens (test piece) having a diameter of 70 mm.

(3) Evaluation test About each test piece prepared above, while measuring photochromism, the evaluation test was done about the adhesiveness of each base material and a functional resin layer, and a lens external appearance.

<Dimmability (return speed)>
The dimming property was tested by molding an organic glass substrate with a thiourethane resin and irradiating and blocking each test piece lens of Examples and Comparative Examples with ultraviolet rays.

UV irradiation is FL4. BLB (black light fluorescent lamp manufactured by Toshiba Lighting & Technology Corp., UV output 0.25 W, UV radiation intensity 2.7 μW / cm ² ) was irradiated from a position 20 cm away from the optical axis of the optical element of the test specimen. Spectral average transmittance was determined according to the following equipment and standards, and average transmittance for light of 380 to 780 nm was determined. The measurement position was the geometric center of the optical element.

-Apparatus: Spectrophotometer U-4100 (manufactured by Hitachi High-Tech Science Co., Ltd.)
-Standard: Specification and test method of transmittance of refraction correcting spectacle lens (JIS T 7333: 2005 (ISO / DIS 8980-3: 2002))
The dimming property is measured by measuring each spectral average transmittance 15 minutes after irradiation and 2 minutes after blocking the irradiation, and “return speed = transmittance 15 minutes after irradiation / transmittance 2 minutes after irradiation stop”. evaluated. That is, it can be said that the lower the numerical value of the return speed, the better the photochromic characteristics. Usually, the return speed is preferably 0.50 or less, more preferably 0.30 or less (see FIGS. 2 to 4).

<Degree of cloudiness of functional resin layer>
The test piece lens was visually judged and the degree of cloudiness was evaluated according to the following criteria, and the initial permeability was also measured in order to quantitatively evaluate the degree of cloudiness. The transmittance of the lens when no photochromic agent was added was approximately 86 to 87%.

    Deep: Almost impossible to see through.

    Pale: You can see through, but you can see that it is cloudy.

    Slight: If you look closely, you can see that it is cloudy.

<Existence of striae>
The presence or absence of striae was confirmed visually.

  Although not shown in the table, in Test Examples No. 3 and No. 15 which are desirable examples, striae occurred when the thickness of the functional resin layer was 3 mm.

<Adhesion>
The adhesion was evaluated by performing a forced peel test. In the forced peel test, a groove (Nyroll groove) for applying a nylon thread is provided on the outer peripheral surface (edge surface) of the lens, which is the interface between the functional resin layer 15 and the organic glass substrate 11, and a minus driver is inserted into the Nyroll groove. The adhesion of both adherends (functional resin layer and lens substrate) was evaluated by forcibly expanding the nyroll groove. The evaluation criteria were as follows.
A: No interfacial peeling (the adherend is broken).
◯: Only the interface peeling outer periphery.
X: Up to the interface peeling center part.
<Test results and discussion>
These test results are shown in Table 1 for the functional resin material EOPO (B), Table 2 for EOPO (R), and Table 3 for reference examples with no addition of PPG (PPO), PEG (PEO) and PAO. Each is shown.

  In each table, the initial transmittance of the test piece was written together, and the return speed ratio with the additive-free reference example was also written. And the following can be understood from the results of each table. In the following description, “No.xx” means Test Example No.

  The higher the molecular weight, the larger the increase ratio of the return speed. For example, in the increase ratio of the return speed, the addition of 2 parts in the case of EOPO (B) 1 is substantially equivalent to the addition of 20 parts of EOPO (B) 4 (No. 1 and No. 11).

  Similarly, when the EO content is 30% or less, dark or light turbidity is generated in the functional resin layer, and the return speed ratio is less than 1 (No. 12, 13).

  Mn with Mn of 10,000 or more: When 13,000 EOPO (B) 1 and 18.5 thousand EOPO (R) 1 are compared, when the addition amount is small (2 parts), the difference in Mn between the two is remarkable. On the other hand, when the amount added is increased (No. 1 and No. 14), the difference in Mn between the two becomes remarkable (No. 3 and No. 15).

  As for the combination of the NCO component and the SH component, from the viewpoint of the return speed, the combination of NBDI and PMP or BMTU or HDI and PMP is more preferable than the combination of H12MDI or MXDI and PMP (Table 2 Test Examples No. 14 to 19). And No.20-23).

  Further, in PPG400, PPG2000, and PEG1000, white turbidity is generated in the functional resin layer and the return speed ratio is less than 1 (No. 28-30). Further, even if PPG1000 is not added in an amount of 8 parts or more, there is no action for increasing the return speed (Nos. 24-27).

  Then, data is extracted from these tables, and the EOPO (x axis) of the return speed (y axis) and Mn (x axis) of each added part and Mn 10,000 and Mn 13,000 added parts (x axis). The correlation with the EO equivalent addition amount (x-axis) in B) is shown in FIG. 2, FIG. 3 and FIG. 4, respectively.

  The following can be seen from FIGS.

  From FIG. 2, it can be seen that the larger the Mn of EOPO (B), the easier it is to obtain a return speed, and in particular, 3,000 or more, and even 10,000 or more can easily obtain a fast return speed.

  From FIG. 3, it can be seen that the greater the amount of EOPO (B) added, the easier the return speed increases, and in particular, 4 parts or more is desirable. However, an increase in the amount of addition tends to affect the physical properties of the basic polymer of the functional resin layer, which is not desirable, and is preferably 20 parts or less, more preferably about 7 to 15 parts.

  From FIG. 4, it can be seen that the return speed becomes easier to increase as the converted EO addition amount of EOPO (B) increases, and specifically, the effect becomes remarkable at 1.5 parts or more.

  That is, it can be seen that the return speed of the functional purpose layer is affected by the length of the ether chain (particularly PEO) and its content.

  As for the adhesion between the functional resin layer and the lens base material, the case where the lens base material is a thiourethane resin was taken as an example, but other resins, episulfide-based, (meth) acrylate-based, nylon-based or The present inventors have confirmed that even if it is a polyurea type, it has good cross-linking adhesion as shown in Table 2-1 to Table 2-6 of the basic application 2.

  DESCRIPTION OF SYMBOLS 11 ... Lens base material (organic glass base material), 13 ... 1st mold, 15 ... Functional resin layer, 17 ... 2nd mold, 19 ... Taping, 21 ... Cavity.

Claims (9)

An optical element in which a thermosetting functional resin layer is integrated on one side or both sides of an organic glass substrate that is a resin molded body,
The functional resin layer is formed of a crosslinked polymer of a thiourethane resin composition containing an organic photochromic agent,
The active hydrogen component of the urethane resin in the composition has an SH component as a main component and an auxiliary component as an OH component, and the OH component contains a polyalkylene oxide (PAO),
The PAO has Mn in E O content of 30% to 90% a copolymer of ethylene oxide (EO) and propylene oxide (PO): all SANYO selected from 3,000 or more of the group, and, the PAO is EOPO block copolymer represented by the following molecular formula (hereinafter referred to as EOPO (B)),
An optical element, wherein the PAO added amount (= PAO added amount x EO content) of the PAO in the composition is 1.5 to 17 parts .
_{HO- (C 2 H 4 O)} n1 - (C 3 H 6 O) m - (C 2 H 4 O) n2 -H The optical element according to claim 1, wherein the PAO is Mn: 10,000 or more . An optical element in which a thermosetting functional resin layer is integrated on one side or both sides of an organic glass substrate that is a resin molded body,
The functional resin layer is formed of a crosslinked polymer of a thiourethane resin composition containing an organic photochromic agent,
The active hydrogen component of the urethane resin in the composition has an SH component as a main component and an auxiliary component as an OH component, and the OH component contains a polyalkylene oxide (PAO),
The PAO has Mn in EO content of 30% to 90% a copolymer of ethylene oxide (EO) and propylene oxide (PO): is selected from a 10 thousand or more of the group, and, the PAO is under Symbol An EOPO random copolymer represented by a molecular formula (hereinafter referred to as EOPO (R)),
Light Science elements EO conversion amount of the PAO (= PAO amount × EO content) is characterized in that it is a 1.5 to 17 parts of the composition.
_{HO- (C 2 H 4 O)} n1 -ran- (C 3 H 6 O) n2 -H The optical element of claim 1 or 3 the thickness of the functional resin layer is characterized in that it is a 0.2 to 2.5 mm. The optical element according to claim 1 or 3, wherein the combination of NCO component / SH component in the composition is a combination of NBDI and PEMP or BMTU, or HDI and PMP. Polymerization of the resin molded body, thiourethane, episulfide, (meth) acrylate, was formed with a nylon or polyurea resin, the thermosetting functional resin layer before Symbol resin molding The optical element according to claim 5, wherein the optical element is closely attached. The resin molded body, thiourethane, episulfide, (meth) acrylate, as well as a nylon or polyurea, by the thermosetting of the functional resin layer is polymerized contact before Symbol resin molding The optical element according to claim 1. It is a method for producing an optical element in which a functional resin layer is integrated by polymerizing and sticking to one side or both sides of an organic glass substrate that is a resin molded body by casting,
Using a thiourethane resin composition as a raw material for the functional resin layer,
The active hydrogen component with respect to the isocyanate component in the composition contains an SH component as a main component and an auxiliary component as an OH component, and contains polyalkylene oxide (PAO) as the OH component,
The PAO is a copolymer of propylene oxide (PO) and ethylene oxide (EO) , and is selected from the group having an EO content of 30 to 90% and Mn of 3,000 or more , and the PAO is represented by the following molecular formula A block copolymer (hereinafter referred to as EOPO (B)),
EO conversion addition amount (= PAO addition amount x EO content rate) of the PAO in the composition is 1.5 to 17 parts .
_{HO- (C 2 H 4 O)} n1 - (C 3 H 6 O) m - (C 2 H 4 O) n2 -H It is a method for producing an optical element in which a functional resin layer is integrated by polymerizing and sticking to one side or both sides of an organic glass substrate that is a resin molded body by casting,
Using a thiourethane resin composition as a raw material for the functional resin layer,
The active hydrogen component with respect to the isocyanate component in the composition contains an SH component as a main component and an auxiliary component as an OH component, and contains polyalkylene oxide (PAO) as the OH component,
As the PAO, a copolymer of propylene oxide (PO) and ethylene oxide (EO), EO content: at 30 to 90% Mn: selected from 10 thousand or more of the group, EOPO said PAO is represented by the following molecular formula A random copolymer (hereinafter referred to as EOPO (R)),
EO conversion addition amount (= PAO addition amount x EO content rate) of the PAO in the composition is 1.5 to 17 parts.
_{HO- (C 2 H 4 O)} n1 -ran- (C 3 H 6 O) n2 -H

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