JPH02262104A - Antireflection plastic lens having high refractive index - Google Patents

Abstract

PURPOSE:To improve mar-proof and optical characteristics by forming a specified hard coat film and a specified multilayered antireflection film on the surface of the substrate of a plastic lens based on polyurethane. CONSTITUTION:A hard coat film contg. silicone resin and a multilayered antireflection film having a vapor-deposited film of a mixture of oxides of metals including Ta, Zr and Y as a film having a high refractive index is formed on the surface of the substrate of a plastic lens based on polyurethane obtd. by polymerizing polyisocyanate and polythiol. A thin lightweight antireflection plastic lens having a high refractive index is obtd. This lens has improved mar-proof and optical characteristics without reducing the shock resistance.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an antireflection high refractive index plastic lens, and in particular, a multilayer antireflection film is provided on the hard coat film provided on a polyurethane lens substrate. This invention relates to antireflection high refractive index plastic lenses.

[Prior Art] In recent years, plastics have come to be used instead of inorganic glass as materials for optical lenses such as eyeglass lenses, photographic camera lenses, and video camera lenses. Plastic lenses have many advantages over conventional glass lenses, such as being lighter, having better impact resistance, and being easier to dye.

However, diethylene glycol bisallyl carbonate, which is mainly used in plastic lenses, has a refractive index of 1.50, which is lower than inorganic glass, and the edge thickness becomes large, especially in minus lenses, so thinner plastic lenses are desired. ing.

Various proposals have been made in response to the demand for thinner plastic lenses. For example, JP-A-60-19901
No. 6 proposes a polyurethane lens made of a copolymer of polyisocyanate and polythiol. This polyurethane lens has an nd of 1.56~
Since it has a high specific gravity of 1.64 and a low specific gravity of 1.22 to 1.44, it is particularly suitable as a thin and light optical lens. Additionally, this polyurethane lens inherently has excellent impact resistance and dyeability.

However, like other plastic lenses, this polyurethane lens has poor scratch resistance, and in order to improve this scratch resistance, it is preferable to perform surface treatment such as providing an organic hard coat film.

Therefore, in Japanese Patent Publication No. 61-48123, an organic hard coat film of melamine-based resin is applied to the surface of a synthetic resin lens with a relatively high refractive index, such as a polymer such as diallyl phthalate, diallyl isophthalate, diallyl chlorendate, etc. A method of forming is disclosed, the method comprising:
Hexamethoxymethylolmelamine and OH groups, COOH groups, NF2 groups that undergo crosslinking reactions with this melamine compound,
A cured melamine resin film is obtained by applying a mixture of a resin containing epoxy groups, etc., a solvent and a crosslinking catalyst onto the synthetic resin lens substrate, and curing with heat.

On the other hand, a multilayer antireflection film is used for boat fishing by alternately laminating high and low refractive index vapor-deposited films made of an inorganic material on the surface of an optical element to impart an antireflection function.

As such a multilayer anti-reflection film, for example, Japanese Patent Application Laid-Open No.
Publication No. 22704 discloses a multilayer antireflection film with increased film strength and no temperature dependence that includes a high refractive index vapor deposited film using a mixed vapor deposition raw material of Ta2O and ZrO2. The film has a base (film, substrate) temperature of 1.
The film is formed under vapor deposition conditions of 40° C. or higher. Similarly,
JP-A-46-4759 discloses a multilayer antireflection film including a high refractive index vapor-deposited film using a mixed vapor deposition raw material of Zr and Ta (at least one of which is an oxide).

[Problems to be Solved by the Invention] However, when using a resin that hardens by addition condensation, such as a melamine resin, as a hard coat film, the heat curing processing temperature must generally be quite high, and the Although it is preferable for substrates with good heat resistance such as, there is a limit to the processing temperature for substrates with poor heat resistance.
Even if the treatment temperature is lowered and the curing time is increased, the hardness is not as strong as that applied to metal or glass.

Therefore, even when a melamine-based resin-containing coating composition is applied and cured to a polyurethane lens, which is said to have lower heat resistance than ordinary plastic lenses,
It is clear that similar drawbacks arise.

In addition, in forming an antireflection film, the above-mentioned Japanese Patent Application Laid-Open No.
It is known that the vapor deposited film using the mixed vapor deposition raw material of Ta205 and ZrO2 disclosed in JP-A-4759 and JP-A-55-22704 exhibits excellent optical properties with less temperature dependence and strength. However, since the vapor-deposited film itself absorbs, a coloring effect occurs, making it difficult to use for optical lenses that require transparency, and it is difficult to use the film at a sufficiently high substrate temperature during film formation, such as with polyurethane lenses. There is a problem in that it is difficult to form a vapor deposited film with sufficient mechanical strength and chemical durability on a substrate that cannot be used.
It has been difficult to obtain antireflection high refractive index plastic lenses with excellent optical properties.

Therefore, an object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to provide a thin and lightweight anti-reflection high refractive index plastic lens with improved scratch resistance and optical properties. Our objective is to provide refractive index plastic lenses.

[Means for solving the problems] The present invention has been made to solve the above objects, and
The antireflection high refractive index plastic lens of the present invention comprises a plastic lens substrate mainly composed of polyurethane obtained by polymerizing polyisocyanate and polythiol, and an organosilicon polymer provided on the surface of the plastic substrate. and a multilayer anti-reflection film provided on the hard coat film, the multilayer antireflection film having a mixed vapor-deposited film of metal oxides containing tantalum, zirconium, and yttrium as a high refractive index film. This is a characteristic feature.

In the present invention, a plastic lens substrate whose main component is polyurethane obtained by polymerizing polyisocyanate and polythiol is produced by casting a mixed solution of polyisocyanate and polythiol in a mold consisting of a lens mold and a resin gasket. Obtained by polymerization.

There are no particular limitations on the polyisocyanate used as a monomer for manufacturing polyurethane lenses, but
Tolylene diisocyanate, diphenylmethane diisocyanate, polymeric diphenylmethane diisocyanate, naphthylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated diphenylmethane diisocyanate, lysine diisocyanate, triphenylmethane triisocyanate, Tris (Isocyanate phenyl) thiophosphate, trans-cyclohexane-1,4-diisocyanate, p-phenylene diisocyanate, tetramethylene diisocyanate, 1,6.11-undecane triisocyanate, 1,8-diisocyanate-4-
Isocyanate methyl octane, lysine ester triisocyanate, 1. 3. Examples include polyisocyanate compounds such as 6-hexamethylene triisocyanate and bicycloheptane triisocyanate, and allophanate-modified products, biuret-modified products, isocyanurate-modified products, and adduct-modified products with polyols or polythiols of these compounds, which can be used alone. Alternatively, a mixture of two or more types may be used as necessary.

Other known isocyanate compounds may also be used, but the isocyanate compound serving as the main component must be bifunctional or higher. Halogen atoms such as Cj2 and Br may be introduced into known aromatic isocyanate compounds. Particularly preferred isocyanate compounds include non-yellowing type isocyanate compounds represented by xylylene diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate.

Furthermore, the polythiol used in the reaction with polyisocyanate for producing polyurethane lenses is not particularly limited, and any known polythiol can be used. For example, ethanedithiol, propanedithiol, propanetrithiol, butanedithiol, pentanedithiol, hexanedithiol, heptanedithiol, octanedithiol, cyclohexanedithiol, cycloheptanedithiol, 2,5-dichlorobenzene-1°3-
Examples include dithiol, pentaerythritol tetrakis-3-mercaptopropionate, pentaerythritol tetrakis thioglycolate, and pentaerythritol derivatives are particularly preferred.

During cast polymerization of polyisocyanate and polythiol, by adding a phosphoric acid ester represented by the following general formula as a mold release agent to the monomer mixture, it has an excellent optical surface, a high refractive index, and a low Arabe number. A large plastic lens with sufficient performance to be used as an optical lens can be obtained.

(RO)2P-OH (Here, R is an alkyl group having 8 or less carbon atoms.) Next, in the present invention, the hard coat film containing an organosilicon polymer formed on the polyurethane lens substrate is: A layer consisting of a compound selected from the group consisting of compounds having the following general formula and/or their hydrolysates,
It can be obtained by forming it on a polyurethane lens substrate by a dipping method, coating method, etc. and then curing it.

General formula % formula % (where R1 and R2 are an alkyl group having 1 to 10 carbon atoms, an aryl group, an alkyl halide, an aryl halide, an alkenyl, or an epoxy group, a (meth)acryloxy group, a mercapto group, or an organic group having a cyano group that is bonded to silicon through a 5i-C bond, R3 is an alkyl group, alkoxyalkyl group, or acyl group having 1 to 6 carbon atoms, and a and b are 0.1 or 2, and a+b is 1 or 2.) Examples of these compounds include methyltrimethoxysilane, methyltriethoxysilane, methyltrimethoxyethoxysilane, methyltriacetoxysilane, methyltripropoxysilane, methyltripropoxysilane, Butoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriacetoxysilane, vinyltrimethoxyethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, phenyltriacetoxysilane, γ -Chloropropyltrimethoxysilane, γ-chloropropyltriethoxysilane, γchloropropyltripropoxysilane, 3,3゜3-trifluoropropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ
Glycidoxypropyltriethoxysilane, γ-(β-
glycidoxyethoxy)propyltrimethoxysilane,
β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, β-(3゜4-epoxycyclohexyl)ethyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, γ-amino Trialkoxy or triazyloxysilanes such as propyltriethoxysilane, γ-mercaptopropyltrimethoxysilane, γmercaptopropyltriethoxysilane, Nβ (aminoethyl)-γ-aminopropyltrimethoxysilane, β-cyanoethyltriethoxysilane, etc. , and dimethyldimethoxysilane, phenylmethyldimethoxysilane, dimethyljethoxysilane, phenylmethyljethoxysilane,
γ-glycidoxypropylmethyldimethoxysilane, γ
-glycidoxypropylmethyljethoxysilane, γ-
Glycidoxypropylphenyldimethoxysilane, γ-
Glycidoxypropylphenyldiethoxysilane, γ-
Chloropropylmethyldimethoxysilane, γ-chloropropylmethyljethoxysilane, dimethyldiacetoxysilane, γ-methacryloxypropylmethyldimethoxysilane, γ-methacryloxypropylmethyljethoxysilane, γ-mercaptopropylmethyldimethoxysilane, γ-mercapto Propylmethyljethoxysilane, γ-aminopropylmethyldimethoxysilane, γ-
Examples include dialkoxysilanes or diacyloxysilanes such as aminopropylmethyljethoxysilane, methylvinyldimethoxysilane, and methylvinyljethoxysilane.

These organosilicon compounds can be used alone or in combination of two or more.

Furthermore, although not used alone, there are various tetraalkoxysilanes or their hydrolysates that can be used in combination with the above-mentioned organosilicon compounds.

Examples of such tetraalkoxysilanes include methyl silicate, ethyl silicate, n-propyl silicate, isopropyl silicate, n-butyl silicate, 5eC-butyl silicate, and t-butyl silicate.

These organosilicon compounds can be cured even in the absence of a catalyst, but in order to further accelerate curing,
Various catalysts can be used.

Such catalysts include Lewis acids, various acids or bases containing Lewis acid salts, or organic carboxylic acids, chromic acid, hypochlorous acid, boric acid, bromic acid, selenite, thiosulfuric acid, orthosilicic acid, and thiocyaninic acid. Metal salts such as acid, nitrous acid, aluminic acid, carbonic acid, especially alkali metal salts or ammonium salts, and alkoxides of aluminum, zirconium, or titanium or complex compounds thereof can be used.

Furthermore, it is also possible to use the above-mentioned organosilicon polymer in combination with other organic substances, such as epoxy resins, acrylic copolymers, or hydroxyl group-containing polymers such as polyvinyl alcohol. .

In addition, as other excipient components, Optica Acta (1
A colloidal sol of inorganic oxides such as 5iSAl and Ti5Sb, as disclosed in J. 962, p. 251, can be used.

Furthermore, in order to facilitate the coating operation, it is also possible to use solvents and various additives that maintain good storage conditions.

The multilayer antireflection film in the present invention is formed by alternately laminating low refractive index films and high refractive index films, and the high refractive index film at this time is a mixed vapor-deposited film of metal oxides containing tantalum, zirconium, and yttrium. It is used. In addition, as a low refractive index film, silicon dioxide (S
102) It is preferable to use a membrane.

The mixed vapor deposited film of metal oxides containing tantalum, zirconium and yttrium is zirconium oxide (Z r 0
2) It is preferable to mix powder, tantalum oxide (Ta205) powder, and yttrium oxide (Y203) powder, pressurize it, and sinter it to form a pellet, which is then vapor-deposited by electron beam heating. The composition ratio of the mixed raw material obtained by mixing each powder is such that ZrO2 is 1 in molar ratio.
．． It is preferable that Ta205 is 0.8 to 1.8 and Y2O3 is 0°05 to 0.3.

The mixed vapor deposition film thus obtained is chemically extremely stable compared to ZrO2, as is Ta2O, and has transparency comparable to ZrO2. Furthermore, the film design shows a high refractive index of 2.05, for example.
It is also effective from the second point.

In addition, Ta205 is 0.8 for 1 mol of ZrO2.
When the amount is less than 1.8 mol or more than 1.8 mol, absorption tends to occur in the mixed vapor deposited film obtained, and when Y2O3 exceeds 0.3 mol, the vapor deposition rate increases and absorption occurs in the obtained mixed vapor deposited film. At the same time, the vapor deposition raw material is likely to scatter, making it difficult to control it.

The film structure of the multilayer antireflection film in the present invention is λ/2-
), /4 double layer film, λ/4-λ/4-λ/4 or 1
．． A three-layer film of /4-λ/2-λ/4 is practically preferable, but a multilayer film of four or more layers is also possible from the viewpoint of reflection characteristics. Here, the first layer λ/4 film counting from the substrate side of the three-layer film is a three-layer symmetrical equivalent film using the mixed vapor deposition film and 5102 film described in "2", or an equivalent film of a two-layer composite. There may be.

Furthermore, in forming the multilayer antireflection film, instead of the vacuum evaporation method described above, a method such as a sputtering method using a similar sintered body as a target material or an ion blating method can also be used.

As described above, by providing a hard coat film and a multilayer anti-reflection film on a polyurethane lens substrate, a thin and lightweight anti-reflection high refractive index plastic lens can be produced with high durability without reducing the impact resistance of the lens. An antireflection high refractive index plastic lens with improved scratch resistance and optical properties can be obtained.

[Example] Examples of the present invention will be described below.

Example 1 (Production of high refractive index polyurethane lens) 100 parts by weight of m-xylylene diisocyanate, 142 parts by weight of pentaerythritol tetrakis-3-mercaptopropionate, 6 parts by weight of di-n-butyl phosphate, and dibutyltin. 0.25 parts by weight of dilaurate and 2(2'-hydroxy-5'-t-octylphenyl) as an ultraviolet absorber.
After mixing with 0.5 parts by weight of benzotriazole and stirring thoroughly, deaeration was performed for 60 minutes under a vacuum of 1 mm.

Next, the mixed solution was poured into a mold consisting of a glass lens mold and a resin gasket, and heated at 25°C for 1 hour.
Continuously raise the temperature to 20°C over 20 hours, then 1
Polymerization was carried out by holding at 20°C for 2 hours. After polymerization, the gasket was removed and the lens mold and lens were separated to obtain a high refractive index polyurethane lens.

The obtained lens had good optical properties of nd=1.592 and d-36.

(Preparation of coating liquid) 54 parts by weight of a 0.06N hydrochloric acid aqueous solution was added dropwise to 212 parts by weight of γ-glycidoxypropyltrimethoxysilane with stirring. After the dropwise addition was completed, the mixture was stirred for 24 hours to obtain a hydrolyzate.

Next, 424 parts by weight of antimony pentoxide sol (methanol dispersion sol, average particle size 10 nm, solid content 30%) and 34 parts by weight of Bunacol EX-521 (manufactured by Nagase Kasei Co., Ltd., polyglycerol polyglycidyl ether) as an epoxy compound. After stirring for 5 hours, 6.8 parts by weight of dibutyltin laurate was added as a curing catalyst, and the mixture was further aged for 100 hours to obtain a coating liquid.

(Formation of hard coat film) The high refractive index polyurethane lens produced by the method described above was
After being immersed in a 10% NaOH aqueous solution at 0°C for 5 minutes and thoroughly washed, the dip method (pulling speed 12 cm/min) was performed using the coating solution prepared by the above method.
Coating was carried out, heated at 120° C. for 1 hour to cure, and then slowly cooled to obtain a hard coat film.

(Formation of multilayer antireflection film) A sintered body of SiO2 was used as a vapor deposition raw material for the base layer and a low refractive index film, and ZrO2 powder, Ta2O, powder, and Y2O3 were used as vapor deposition raw materials for a mixed vapor deposition film that was a high refractive index film.
The powders were mixed at a molar ratio of 1:1°370.2, press-molded, and then sintered at 1200°C to form pellets, which were then used to form a polyurethane lens with a hard coat film provided using the method described above. Place in a vapor deposition tank and heat to 85℃ while exhausting.
After heating to 2 X 1O-5 Torr,
The above vapor deposition raw materials were vapor deposited using the electron beam heating method, and the following results were obtained.
1, a base layer made of a silicon oxide film, a first layer of low refractive index film made of a composite equivalent film of a mixed vapor deposited film and a silicon oxide film, and a second layer of high refractive index made of a mixed vapor deposited film. A multilayer antireflection film having a film structure in which a low refractive index film and a third low refractive index film made of silicon oxide were sequentially formed was obtained.

Note that the base layer is preferable because it improves adhesion to the substrate.

Table 1 Table 2 shows the measurement results of the absorptivity of the antireflection high refractive index plastic lens thus obtained in the wavelength range of visible light. The absorption rate (%) in Table 2 is 380 to 7 for the above antireflection high refractive index plastic lens.
Reflectance (R) and transmittance (T) in the 80 nm wavelength range
) was measured using a new model 340 self-recording spectrophotometer manufactured by Hitachi, and was calculated by converting it by 100-(R+T).

As is clear from Table 2, the antireflection high refractive index plastic lens obtained in this example exhibits low absorption over the entire wavelength range of visible light and has excellent optical properties. It was confirmed that there is.

In addition, in evaluating the mechanical properties and chemical properties, the appearance, luminous reflectance, scratch resistance, impact resistance, adhesion, heat resistance, and
Alkali resistance, acid resistance and weather resistance were evaluated and measured in the following manner.

・Visually check the following 1) using an exterior lighting device with a fluorescent lamp as the light source.
It was observed whether conditions 4) to 4) were satisfied.

1) Be transparent.

2) No irregularities on the surface.

3) No striae.

4) There should be no foreign matter or scratches on the surface.

・Luminous reflectance 380 ~ using Hitachi's new model 340 self-recording spectrophotometer
The reflectance in the 780 nm wavelength range was measured, and the luminous efficiency was calculated from this reflectance and the luminous efficiency curve.

- Scratch Resistance The surface of the multilayer antireflection film was rubbed with #0000 steel wool, and the scratch resistance was visually judged. The judgment criteria were as follows.

A: Even if you rub it hard, there will be almost no scratches.

B: If you rub it too hard, it will be seriously damaged.

C: Scratches similar to those on the lens substrate.

・127c at the center of impact resistant anti-reflective high refractive index plastic lens
A steel ball weighing 16 g was dropped from a height of m, and the presence or absence of damage to the lens was examined.

・Adhesion Anti-reflection After making 100 cross-cuts on the surface of a high refractive index plastic lens at 1 mm intervals and strongly pasting cellophane tape, peel it off rapidly to check whether the multilayer anti-reflection coating, base layer and cured coating have peeled off. Examined.

・Place one heat-resistant anti-reflection high refractive index plastic lens in the oven.
After heating for some time, the presence or absence of cracks was examined. The heating temperature started at 70°C and was increased in 5°C increments, and superiority or inferiority was determined based on the temperature at which cracks occur.

- Alkali resistance An antireflection high refractive index plastic lens was immersed in a 1Qwt% NaOH aqueous solution for 24 hours, and the state of erosion on the surface of the multilayer antireflection film was observed.

・24 anti-reflection high refractive index plastic lenses are added to acid-resistant 10 wt% HCI aqueous solution and 10 wt% H2SO4 aqueous solution.
After dipping for a period of time, the state of corrosion on the surface of the multilayer antireflection film was observed.

・Weather-resistant anti-reflection high refractive index plastic lenses were exposed outdoors for one month, and after this, the appearance, luminous reflectance, scratch resistance, impact resistance, adhesion, heat resistance, alkali resistance and acid resistance were evaluated as above. It was evaluated and measured according to the guidelines.

As a result, it was confirmed that the antireflection high refractive index plastic lens of this example obtained good evaluations and measurement results in all items, and was also excellent in mechanical properties and chemical properties. .

Of these evaluations and measurement results, Table 3 shows the evaluation and measurement results for 8 items: appearance, luminous reflectance, scratch resistance, impact resistance, adhesion, heat resistance, alkali resistance, and acid resistance. Weather resistance, that is, the evaluation results of the above eight items after one month of outdoor exposure are shown in Table 4.

Examples 2 to 9 A polyurethane lens having a hard coat film was obtained in the same manner as in Example 1, a base layer was formed in the same manner as in Example 1, and then a two-layer equivalent film of the first layer of the multilayer antireflection film was formed. In forming the mixed vapor deposition film constituting the second layer and the mixed vapor deposition film of the second layer, ZrO2 powder, Ta205 powder and Y2O3
Instead of the mixed raw material of Example 1 in which powder was mixed in a molar ratio of 1:1.3:0.2, a mixed raw material (Example 2) in which powder was mixed in a molar ratio of 1:1:0.1, 1 : Mixed raw materials mixed at a ratio of 1:0.2 (Example 3), Mixed raw materials mixed at a ratio of 1:0.3 (Example 4), 1:1. 3oo, 1
Mixed raw materials mixed in the ratio of (Example 5), 1:1.3:
Mixed raw materials mixed in a ratio of 0.3 (Example 6), 1:1
．． 5:0. Mixed raw materials mixed at a ratio of 1 (Example 7)
), mixed raw materials mixed at a ratio of 1:1° 5:0.2 (Example 8), and mixed raw materials mixed at a ratio of 1:1.5:0.3 (Example 9) were used, respectively. A multilayer antireflection film having the same film structure was provided under the same conditions as in Example 1.

When the absorption rate in the visible light wavelength range of each of the antireflection high refractive index plastic lenses obtained in this way was measured in the same manner as in Example 1, it was found that the lenses obtained in each example It was confirmed that the material showed a low absorption rate over the entire wavelength range, and had excellent optical properties. The measurement results are also listed in Table 2.

In addition, the appearance, luminous reflectance, scratch resistance, impact resistance, adhesion, heat resistance, alkali resistance, acid resistance, and weather resistance of each antireflection high refractive index plastic lens obtained in this way were evaluated. When evaluated and measured in the same manner as in Example 1,
It was confirmed that the antireflection high refractive index plastic lenses obtained in all Examples had good evaluation and measurement results for each item, and were also excellent in mechanical properties and chemical properties.

Example 10 As a coating liquid for a hard coat film, 0.0 parts by weight of γ-glycidoxypropyltrimethoxysilane was added to 212 parts by weight.
54 parts by weight of a 6N aqueous hydrochloric acid solution was added dropwise with stirring, and the resulting hydrolyzate was stirred for 24 hours after the addition, and antimony pentoxide sol (methanol dispersion sol, average particle size 10 nm, solid content 30%) was added. 424 parts by weight, 68 parts by weight of Bunacol EX-521 (manufactured by Nagase Kasei Co., Ltd., polyglycerol polyglycidyl ether) as an epoxy compound, and 34 parts by weight of titanium-1so-propoxyoctylene glycolate, and further 100 parts by weight were added while stirring. An antireflection high refractive index plastic lens was obtained in the same manner as in Example 1 except that a coating liquid obtained by time aging was used.

When the absorption rate in the visible light wavelength range of the antireflection high refractive index plastic lens thus obtained was measured in the same manner as in Example 1, it was found that the absorption rate was low over the entire visible light wavelength range. It was confirmed that it had excellent optical properties.

The measurement results are also listed in Table 2.

In addition, the appearance, luminous reflectance, scratch resistance, impact resistance, adhesion, heat resistance, alkali resistance, acid resistance, and weather resistance of the antireflection high refractive index plastic lens obtained in this way were investigated. When evaluated and measured in the same manner as in Example 1, good evaluation and measurement results were obtained for all items, and it was confirmed that the mechanical properties and chemical properties were also excellent.

Of these evaluations and measurement results, Table 3 shows the evaluation and measurement results for 8 items: appearance, luminous reflectance, scratch resistance, impact resistance, adhesion, heat resistance, alkali resistance, and acid resistance. ,
In addition, the weather resistance, that is, the evaluation results of the above eight items after one month of outdoor exposure are also listed in Table 4.

(Hereinafter, blank space) [Effects of the Invention] As explained above, the antireflection high refractive index plastic lens of the present invention is a plastic lens that has excellent optical properties, as well as excellent mechanical and chemical properties. be.

Therefore, by carrying out the present invention, a thin and lightweight
It has become possible to provide optical lenses with excellent optical properties, as well as excellent mechanical and chemical properties, and this has enabled us to make eyeglass lenses thinner and lighter, and to make optical instruments smaller and lighter, as well as to improve their performance. becomes possible.

Claims (1)

[Claims] (1) A plastic lens substrate whose main component is polyurethane obtained by polymerizing polyisocyanate and polythiol, a hard coat film containing an organosilicon polymer provided on the surface of the plastic substrate, and tantalum and zirconium. and a multilayer antireflection film provided on the hard coat film, the antireflection high refractive index plastic lens having a mixed vapor deposited film of a metal oxide containing yttrium as the high refractive index film. .