JP5620241B2 - Eyeglass lenses - Google Patents

Description

  The present invention relates to a spectacle lens using a polycarbonate resin composition which is excellent in transparency, mold corrosion inhibition, boiling water resistance, molding heat resistance, and hue stability.

  Polycarbonate resin has a high refractive index and excellent properties such as transparency and impact resistance, and has recently been widely used as a material for lenses, particularly for eyeglass lenses. Glasses made of polycarbonate resin are thinner and lighter than conventional glass lenses and plastic lenses such as cast polymerization, as shown in Patent Document 1, because of their extremely high impact strength, and are therefore safe and highly functional. As eyeglass lenses, they have come to be used in vision correction lenses, sunglasses, protective glasses, and the like. For example, Patent Document 2 discloses a polycarbonate resin composition for spectacle lenses.

  Moreover, in the polycarbonate resin manufactured by the interface condensation polymerization method from bisphenol A and phosgene, chlorinated organic solvents, such as a methylene chloride and chlorobenzene, are used as an organic solvent. Corrosion of the mold is significantly accelerated by exposure to moisture in a state where acidic substances and additives contained in the trace amount of chlorinated organic solvents and various additives are attached to the mold surface. It is believed that a polycarbonate resin composition effective in inhibiting mold corrosion can be obtained by adding a partial ester of a higher fatty acid such as glycerin monostearate and a polyhydric alcohol to the polycarbonate resin. (Patent Document 3). Furthermore, a polycarbonate resin composition that suppresses corrosion of the mold by adding an alicyclic epoxy compound to the polycarbonate resin is disclosed (Patent Document 4), but all of the characteristics required for the spectacle lens member are disclosed. I was not satisfied.

  Furthermore, since the eyeglass lens member directly touches the human eye, hue stability is strongly required for the polycarbonate resin used for molding. The sulfur-containing acidic compound or phosphorus compound in the polycarbonate resin composition reacts with the epoxy compound to obtain a neutralizing action, so that a polycarbonate resin composition with improved quality can be obtained by suppressing molecular weight reduction and coloring. Although disclosed (Patent Document 5), the degree of the effect is not clear, and furthermore, it does not satisfy all the characteristics required for the spectacle lens member.

JP 2001-288289 A JP 2006-154783 A Japanese Examined Patent Publication No. 62-034791 Japanese Patent No. 2579653 JP-A-5-239332

  An object of the present invention is a polycarbonate resin that has boiling water resistance and mold corrosion suppression effect, has hue stability during continuous molding, and does not impair the original properties of excellent high temperature molding heat resistance The object is to provide eyeglass lenses.

  In order to achieve the above object, the present inventors have conducted intensive research on epoxy compounds, mold release agents, heat stabilizers, and ultraviolet absorbers used in polycarbonate resin compositions. As a result, specific amounts of specific epoxy compounds are used, By using a specific amount of a mold release agent and a specific heat stabilizer, and further using a specific amount of each of two specific ultraviolet absorbers, it is possible to withstand resistance without impairing inherent properties such as moldability and transparency. The present inventors have found that a spectacle lens molded article having an effect of suppressing boiling water and mold corrosion and having excellent hue stability during continuous molding can be obtained, and the present invention has been achieved.

That is, according to the present invention,
1. (1) For 100 parts by weight of polycarbonate resin having a total chlorine content of 500 ppm or less, (2) 0.003 to 0.2 parts by weight of an epoxy compound that is a copolymer of styrene and glycidyl methacrylate, (3) 2- (2 ′ -Hydroxy-5'-tert-octylphenyl) benzotriazole 0.05 to 0.5 parts by weight, (4) 2- (3-tert-butyl-5-methyl-2-hydroxyphenyl) -5-chloro-2H -0.01 to 0.3 parts by weight of benzotriazole, (5) 0.05 to 0.5 parts by weight of a fatty acid ester release agent, and (6) 0.005 to 0.1 parts by weight of a phosphorus thermal stabilizer. A spectacle lens molded from a polycarbonate resin composition.
2. 2. The spectacle lens according to item 1 above, wherein the fatty acid ester release agent is a mixture of an ester of a monohydric alcohol and a saturated fatty acid and a triester of glycerin and a saturated fatty acid.
3. 2. The spectacle lens according to item 1, wherein the phosphorus heat stabilizer is a phosphorus heat stabilizer having a 2,4-di-tert-butylphenyl skeleton.
4). 2. The spectacle lens according to item 1, wherein the polycarbonate resin composition has a total chlorine content of 60 ppm or less in pellets obtained by molding the polycarbonate resin composition with a twin screw extruder.
5. The polycarbonate resin composition comprises a maximum YI value of 50 5 mm thick molded plates obtained by molding a pellet obtained by molding the polycarbonate resin composition with a twin screw extruder with an injection molding machine. The spectacle lens according to claim 1, wherein the difference between the minimum values is 0.15 or less.

  The spectacle lens obtained from the polycarbonate resin composition of the present invention maintains excellent impact resistance, transparency, ultraviolet blocking property, hue stability, mold corrosion suppression, boiling water resistance, molding heat resistance, and Even if it has a high repro performance and has a heat history, it has little yellowing, so the industrial effect it produces is exceptional.

The schematic diagram of the metal mold | die used for evaluation of metal mold | die corrosiveness (cavity size side 42mm x length 24mm x depth 3mmt, insert for corrosion evaluation (20mmphi) created with metal mold | die material NAK80) is shown.

Hereinafter, the present invention will be described in detail.
The polycarbonate resin used in the present invention is an aromatic polycarbonate resin obtained by reacting a dihydric phenol and a carbonate precursor. Specific examples of the dihydric phenol used here include, for example, 2,2-bis (4-hydroxyphenyl) propane (commonly called bisphenol A), bis (4-hydroxyphenyl) methane, and 1,1-bis (4-hydroxyphenyl). ) Ethane, 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) octane, 2,2-bis (4-hydroxyphenyl) phenylmethane, 2,2-bis (4 -Hydroxy-3-methylphenyl) propane, 1,1-bis (4-hydroxy-3-tert-butylphenyl) propane, 2,2-bis (4-hydroxy-3-bromophenyl) propane, 2,2- Bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis (4-hydroxy-3,5-dichlorophenyl) Bis (hydroxyaryl) alkanes such as lopan, 1,1-bis (hydroxyphenyl) cyclopentane, bis (hydroxyphenyl) cycloalkanes such as 1,1-bis (hydroxyphenyl) cyclohexane, 4,4′-dihydroxy Dihydroxy ethers such as diphenyl ether, 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether, dihydroxys such as 4,4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfide Diaryl sulfides, 4,4'-dihydroxydiphenyl sulfoxide, dihydroxy diaryl sulfoxides such as 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide, 4,4'-dihydroxydiphenyls Hong, dihydroxy diaryl sulfones such as 4,4'-dihydroxy-3,3'-dimethyl diphenyl sulfone. These dihydric phenols may be used alone or in combination of two or more.

  Among the dihydric phenols, 2,2-bis (4-hydroxyphenyl) propane (bisphenol A) is preferably used as the main dihydric phenol component, particularly 70 mol% or more, particularly 80 mol in the total dihydric phenol component. % Or more is preferably bisphenol A. Most preferred is an aromatic polycarbonate resin in which the dihydric phenol component is substantially bisphenol A.

  The basic means for producing the polycarbonate resin will be briefly described. In the solution method using phosgene as a carbonate precursor, the reaction of a dihydric phenol component and phosgene is usually performed in the presence of an acid binder and an organic solvent. Examples of the acid binder include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, and amine compounds such as pyridine. As the organic solvent, for example, halogenated hydrocarbons such as methylene chloride and chlorobenzene are used. In addition, a catalyst such as a tertiary amine or a quaternary ammonium salt can be used for promoting the reaction, and a terminal terminator such as an alkyl-substituted phenol such as phenol or p-tert-butylphenol is used as a molecular weight regulator. It is desirable to use it. The reaction temperature is preferably 0 to 40 ° C., the reaction time is several minutes to 5 hours, and the pH during the reaction is preferably maintained at 10 or more.

  In the transesterification method (melting method) using a carbonic acid diester as a carbonate precursor, a predetermined proportion of a dihydric phenol component and a carbonic acid diester are stirred with heating in the presence of an inert gas, and the resulting alcohol or phenols are distilled. It is a method to make it come out. The reaction temperature varies depending on the boiling point of the alcohol or phenol produced, but is usually in the range of 120 to 350 ° C. The reaction is carried out while distilling off the alcohol or phenol produced under reduced pressure from the beginning. Moreover, in order to accelerate | stimulate reaction, a normal transesterification reaction catalyst can be used. Examples of the carbonic acid diester used in the transesterification include diphenyl carbonate, dinaphthyl carbonate, dimethyl carbonate, diethyl carbonate, dibutyl carbonate, and the like, and diphenyl carbonate is particularly preferable.

  The polycarbonate resin used in the present invention has a total chlorine content of 500 ppm or less, preferably 400 ppm or less. If the total chlorine content exceeds 500 ppm, the hue stability and the mold corrosiveness are inferior. The total amount of chlorine in the polycarbonate resin is measured using a scanning fluorescent X-ray analyzer ZSX Primus II manufactured by Rigaku Corporation.

  As a method for obtaining a polycarbonate resin having a total chlorine content of 500 ppm or less, the halogenated hydrocarbon organic solvent used in the production of the polycarbonate resin is dried at a high temperature in the drying step after the granulation step. It can be obtained by a method of drying for a time.

The molecular weight of the polycarbonate resin used in the present invention is preferably 1.7 × 10 ^{4 to} 3.0 × 10 ⁴ , particularly preferably 2.0 × 10 ^{4 to} 2.6 × 10 ⁴ in terms of viscosity average molecular weight. Eyeglass lenses are precision molded, and it is important to accurately transfer the mirror surface of the mold to give the specified curvature and power. A low-viscosity resin with good melt flow is desirable, but if it is too low The impact strength that is characteristic of polycarbonate resin cannot be maintained. Here, for the viscosity average molecular weight (M) of the polycarbonate resin, the specific viscosity (η _sp ) obtained from a solution obtained by dissolving 0.7 g of the polycarbonate resin in 100 ml of methylene chloride at 20 ° C. using an Ostwald viscometer is inserted into the following equation. It is what I asked for.
η _sp /c=[η]+0.45×[η] ² c (where [η] is the intrinsic viscosity)
[Η] = 1.23 × 10 ⁻⁴ M ^0.83
c = 0.7

  An epoxy compound is added to the polycarbonate resin composition of the present invention for the purpose of imparting mold corrosion inhibition, hue stability of a spectacle lens molded article and good boiling water resistance. And in the case of the molded article used for the spectacle lens member in this invention, the outstanding hue stability at the time of injection compression molding is required. As such an epoxy compound, a copolymer of styrene and glycidyl methacrylate is used.

  As an addition amount of said epoxy compound, 0.003-0.2 weight part is required with respect to 100 weight part of polycarbonate resin. Preferably it is 0.004-0.15 weight part, More preferably, it is 0.005-0.1 weight part, More preferably, it is 0.005-0.05 weight part, Most preferably, it is 0.005-0. 0.02 part by weight. When the addition amount of the epoxy compound is less than 0.003 parts by weight, the effect of suppressing mold corrosion when molding the polycarbonate resin of the present invention is not sufficient, and the effect of improving boiling water resistance is not sufficient. When the addition amount of the epoxy compound exceeds 0.2 parts by weight, the heat resistance and repellet property of the polycarbonate resin deteriorate, resulting in a problem that adversely affects the hue stability of the molded product.

The resin composition of the present invention contains two types of ultraviolet absorber (A) and ultraviolet absorber (B) in a polycarbonate resin.
One is an ultraviolet absorber (A), which is 2- (2′-hydroxy-5′-tert-octylphenyl) benzotriazole.
The content of the ultraviolet absorber (A) is 0.05 to 0.5 parts by weight, preferably 0.1 to 0.4 parts by weight, more preferably 0.15 to 0.35 parts by weight per 100 parts by weight of the polycarbonate resin. Part. If the amount is less than 0.05 parts by weight, the ultraviolet absorption performance is insufficient, and even if the amount exceeds 0.4 parts by weight, the ultraviolet absorption ability is no longer improved. ) And hue are significantly deteriorated.

The other one is an ultraviolet absorber (B), 2- (3-tert-butyl-5-methyl-2-hydroxyphenyl) -5-chloro-2H-benzotriazole.
The content of the ultraviolet absorber (B) is 0.01 to 0.3 part by weight, preferably 0.01 to 0.27 part by weight, more preferably 0.02 to 0.25 part by weight per 100 parts by weight of the polycarbonate resin. Part. If the amount is less than 0.01 parts by weight, the ultraviolet absorption performance is insufficient, and if it exceeds 0.3 parts by weight, the ultraviolet absorbent (B) remarkably deteriorates the hue of the polycarbonate resin, resulting in a dull color spectacle lens.

  When these two types of ultraviolet absorbers (A) and (B) are both used alone, they are added in such a large amount that the absorption of ultraviolet rays having a wavelength of 385 nm is insufficient or the absorption is sufficient. The ultraviolet absorber sublimates at the time of molding, and the haze of the lens increases or the hue deteriorates. By using a combination of the ultraviolet absorbers (A) and (B), even if each amount is relatively small, the spectral transmittance at 385 nm is 1% or less on a 2 mm-thick molded plate, and this wavelength Ultraviolet rays can be absorbed almost completely, and the total light transmittance is maintained at a high level of about 90%, and the hue of the lens is also good.

  Moreover, the blending ratio (R) of the ultraviolet absorber (A) and the ultraviolet absorber (B) is expressed in terms of B / A (weight ratio), and is preferably in the range of 0.05 to 4, more preferably 0.8. The range is from 05 to 3, more preferably from 0.05 to 1, and particularly preferably from 0.05 to 0.5. When the blending ratio (R) is less than 0.05, the ultraviolet absorption performance is insufficient, and when the blending ratio (R) exceeds 4, there is a tendency for the hue to deteriorate significantly.

  The resin composition of the present invention includes other benzotriazole-based UV absorbers, benzophenone-based UV absorbers, triazine-based UV absorbers, cyclic imino ester-based UV absorbers, and cyanoacrylate-based UV absorbers as long as the characteristics are not impaired. An agent or the like can be blended.

The polycarbonate resin composition of the present invention is blended with a fatty acid ester release agent in order to improve the releasability from the mold of the resin molded product of the spectacle lens during melt molding.
Examples of the fatty acid ester release agent include esters of monohydric alcohols having 1 to 20 carbon atoms and saturated fatty acids having 10 to 30 carbon atoms, polyhydric alcohols having 1 to 25 carbon atoms, and 10 to 30 carbon atoms. At least one mold release agent selected from the group consisting of partial esters or total esters with saturated fatty acids is used.

  Specific examples of the ester of a monohydric alcohol and a saturated fatty acid include stearyl stearate, palmityl palmitate, butyl stearate, methyl laurate, isopropyl palmitate, and stearyl stearate is preferable.

  Specific examples of partial esters or total esters of polyhydric alcohols and saturated fatty acids include glycerin monostearate, glycerin distearate, glycerin tristearate, glycerin monobehenate, pentaerythritol monostearate, pentaerythritol tetrastearate. All or partial esters of dipentaerythritol, such as pentaerythritol tetrapelargonate, propylene glycol monostearate, biphenyl biphenate, sorbitan monostearate, 2-ethylhexyl stearate, dipentaerythritol hexastearate, etc. Is mentioned.

  These release agents are used alone or in combination of two or more. Among the above fatty acid esters, monohydric alcohol and saturated fatty acid esters and glycerin and saturated fatty acid triester mixtures, glycerol monostearate, glycerol tristearate, pentaerythritol tetrastearate, glycerol tristearate and stearyl stearate. Mixtures with rates are preferably used.

The compounding quantity of a mold release agent is 0.05-0.5 weight part with respect to 100 weight part of polycarbonate resin, More preferably, it is 0.08-0.4 weight part, Most preferably, it is 0.1-0. .3 parts by weight. When the blending amount is less than 0.05 parts by weight, good releasability cannot be obtained, and when it exceeds 0.5 parts by weight, the discoloration of the spectacle lens is deteriorated.
The release agent can be used in combination with other release agents known to those skilled in the art, but even when used in combination, the content of the fatty acid ester release agent is 0.05 to 0.5 parts by weight. The main component of the agent is preferred.

  The polycarbonate resin composition of the present invention contains a phosphorus-based heat stabilizer. Examples of the phosphorous heat stabilizer include phosphorous acid, phosphoric acid, phosphonous acid, phosphonic acid and esters thereof. Specifically, triphenyl phosphite, tris (nonylphenyl) phosphite, tris ( 2,4-di-tert-butylphenyl) phosphite, tris (2,6-di-tert-butylphenyl) phosphite, tridecyl phosphite, trioctyl phosphite, trioctadecyl phosphite, didecyl monophenyl phosphite Phyto, dioctyl monophenyl phosphite, diisopropyl monophenyl phosphite, monobutyl diphenyl phosphite, monodecyl diphenyl phosphite, monooctyl diphenyl phosphite, bis (2,6-di-tert-butyl-4-methylphenyl) penta Erisrito Diphosphite, 2,2-methylenebis (4,6-di-tert-butylphenyl) octyl phosphite, bis (nonylphenyl) pentaerythritol diphosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol di Phosphite, distearyl pentaerythritol diphosphite, tributyl phosphate, triethyl phosphate, trimethyl phosphate, triphenyl phosphate, diphenyl monoorthoxenyl phosphate, dibutyl phosphate, dioctyl phosphate, diisopropyl phosphate, dimethyl benzenephosphonate, diethyl benzenephosphonate, Dipropyl benzenephosphonate, tetrakis (2,4-di-tert-butylphenyl) -4,4'-biphenylenediphos Knight, tetrakis (2,4-di-tert-butylphenyl) -4,3′-biphenylene diphosphonite, tetrakis (2,4-di-tert-butylphenyl) -3,3′-biphenylene diphosphonite, Examples thereof include bis (2,4-di-tert-butylphenyl) -4-phenyl-phenylphosphonite and bis (2,4-di-tert-butylphenyl) -3-phenyl-phenylphosphonite. These can be used alone or in combination of two or more. Among these, a phosphorus-based heat stabilizer having a 2,4-di-tert-butylphenyl skeleton is preferably used.

  Preferably, tris (2,4-di-tert-butylphenyl) phosphite, tetrakis (2,4-di-tert-butylphenyl) -4,4′-biphenylenediphosphonite, tetrakis (2,4-di -Tert-butylphenyl) -4,3'-biphenylenediphosphonite, tetrakis (2,4-di-tert-butylphenyl) -3,3'-biphenylenediphosphonite, bis (2,4-di-tert -Butylphenyl) -4-phenyl-phenylphosphonite and bis (2,4-di-tert-butylphenyl) -3-phenyl-phenylphosphonite are used, particularly preferably tetrakis (2,4-di-tert -Butylphenyl) -4,4'-biphenylenediphosphonite is used.

  The compounding amount of these phosphorus heat stabilizers is 0.005 to 0.1 parts by weight, more preferably 0.008 to 0.08 parts by weight, and particularly preferably 0.01 to 100 parts by weight of the polycarbonate resin. -0.06 part by weight. When the blending amount is less than 0.005 parts by weight, the stabilization effect of the target polycarbonate resin in the high temperature zone is reduced, and when it exceeds 0.1 parts by weight, the hue of the molded product is stabilized, dry heat property, haze value. (Haze) may be adversely affected.

  The polycarbonate resin composition of the present invention can be blended within a range that does not impair the characteristics that should originally have a hindered phenol-based antioxidant. Examples of the hindered phenol antioxidant include triethylene glycol-bis [3- (3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate], 1,6-hexanediol-bis [3- ( 3,5-di-tert-butyl-4-hydroxyphenyl) propionate], pentaerythritol-tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3 , 5-di-tert-butyl-4-hydroxyphenyl) propionate, 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene, N , N-hexamethylenebis (3,5-di-tert-butyl-4-hydroxy-hydrocinna Id), 3,5-di-tert-butyl-4-hydroxy-benzylphosphonate-diethyl ester, tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate and 3,9-bis {1 , 1-dimethyl-2- [β- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] ethyl} -2,4,8,10-tetraoxaspiro (5,5) undecane, etc. Is mentioned. These can be used alone or in combination of two or more. Among these, a hindered phenol antioxidant having a pentaerythritol skeleton is preferably used. In particular, pentaerythritol-tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] is preferable.

  The amount of these hindered phenolic antioxidants is preferably 0.01 to 0.3 parts by weight, more preferably 0.02 to 0.25 parts by weight, particularly preferably 100 parts by weight of the polycarbonate resin. Is 0.03-0.2 parts by weight. If the blending amount is less than 0.01 parts by weight, sufficient repellet property cannot be obtained, and the hue stability of the molded product may be adversely affected. Moreover, when it exceeds 0.3 weight part, there exists a possibility of leading to the increase in the metal deposit | attachment at the time of shaping | molding, and the fall of a physical property.

  In the polycarbonate resin composition of the present invention, when molded into a spectacle lens, a bluing agent can be blended to counteract the yellowishness of the lens based on the polycarbonate resin or the ultraviolet absorber. Any bluing agent can be used without any problem as long as it is used for polycarbonate resin. In general, anthraquinone dyes are easily available and preferred.

  Specific examples of the bluing agent include the general name Solvent Violet 13 [CA. No. (Color Index No.) 60725; Trade names “Macrolex Violet B” manufactured by Bayer, “Diaresin Blue G” manufactured by Mitsubishi Chemical Corporation, “Sumiplast Violet B” manufactured by Sumitomo Chemical Co., Ltd.], general name Solvent Violet 31 [CA. No. 68210; Trade name “Diaresin Violet D” manufactured by Mitsubishi Chemical Corporation], generic name Solvent Violet 33 [CA. No. 60725; Trade name “Diaresin Blue J” manufactured by Mitsubishi Chemical Corporation], generic name Solvent Blue 94 [CA. No. 61500; trade name “Diaresin Blue N” manufactured by Mitsubishi Chemical Corporation, generic name Solvent Violet 36 [CA. No. 68210; trade name: “Macrolex Violet 3R” manufactured by Bayer, generic name Solvent Blue97 [tradename: “Macrolex Blue RR” manufactured by Bayer, Inc.] and generic name, SolventBlue45 [CA. No. 61110; trade name “Tetrazole Blue RLS” manufactured by Sand Corp.] is a typical example. These bluing agents are usually blended in the polycarbonate resin at a concentration of 0.3 to 1.2 ppm. When a too large amount of bluing agent is added, the absorption of the bluing agent is strengthened, resulting in a lens with a reduced luminous transmittance. In particular, in the case of eyeglass lenses for vision correction, there are thick and thin portions, and the change in lens thickness is large.Therefore, if the absorption of bluing agent is strong, there will be a hue difference due to the difference in thickness between the center and the outer periphery of the lens. Resulting in a lens with a significantly inferior appearance.

  In the polycarbonate resin composition of the present invention, an amount of a sulfur-based heat stabilizer that does not impair the object of the present invention can be used. Examples of the heat stabilizer include pentaerythritol-tetrakis (3-laurylthiopropionate), pentaerythritol-tetrakis (3-myristylthiopropionate), pentaerythritol-tetrakis (3-stearylthiopropionate), dilauryl. -3,3'-thiodipropionate, dimyristyl-3,3'-thiodipropionate, distearyl-3,3'-thiodipropionate, among others, pentaerythritol-tetrakis (3-lauryl) Thiopropionate), pentaerythritol-tetrakis (3-myristylthiopropionate), dilauryl-3, 3′-thiodipropionate, dimyristyl-3, 3′-thiodipropionate are preferred. Particularly preferred is pentaerythritol-tetrakis (3-laurylthiopropionate). The thioether compounds are commercially available from Sumitomo Chemical Co., Ltd. as Sumilizer TP-D (trade name), Sumilizer TPM (trade name), and the like, and can be easily used. As content of the sulfur type heat stabilizer in polycarbonate resin, 0.001-0.2 weight part is preferable with respect to 100 weight part of polycarbonate resin.

  In the polycarbonate resin of the present invention, other heat stabilizers, antistatic agents, flame retardants, heat ray shielding agents, fluorescent whitening agents, pigments, light diffusing agents, reinforcing fillers are also included within the range not impairing the object of the present invention. Other resins and elastomers can be blended.

  In the polycarbonate resin composition of the present invention, the total chlorine content of pellets obtained by molding the polycarbonate resin composition with a twin screw extruder is preferably 60 ppm or less, more preferably 55 ppm or less. If the total chlorine amount in the pellet is 60 ppm or less, the hue stability and the mold corrosiveness are excellent, which is preferable.

  The polycarbonate resin composition of the present invention is formed by molding a pellet obtained by molding the polycarbonate resin composition with a twin screw extruder at a cylinder temperature of 300 ° C., a mold temperature of 105 ° C., and a one minute cycle. It is preferable that the difference between the maximum value and the minimum value of the YI values of 50 5 mm-thick molded plates obtained in this way is 0.15 or less.

The polycarbonate resin composition used as a material for molding the spectacle lens of the present invention is obtained by molding the polycarbonate resin composition with an injection molding machine at a cylinder temperature of 370 ° C., a mold temperature of 80 ° C., and a cycle of 1 minute. The hue change (ΔE ′) between the molded plate and the molded plate obtained after 10 minutes of residence is preferably 0.4 or less. The hue (L, a, b) value of each molded plate is measured by the C light source reflection method according to JIS K-7105, and the hue change (ΔE ′) is obtained by the following equation.
ΔE = {(ΔL) ² + (Δa) ² + (Δb) ² } ^1/2
Hue of “molded plate before stay”: L, a, b
Hue of “molded plate after residence”: L ′, a ′, b ′
ΔL: LL ′
Δa: aa ′
Δb: bb ′

  The spectacle lens referred to in the present invention is not particularly limited, and at the time of molding, both the convex surface and concave surface of the lens are optically finished by transfer of the glass mold surface, and a finish lens that is molded to a desired power Only the convex surface is optically finished in the same manner as the finish lens, and refers to both semi-finished lenses that later optically finish the concave surface according to a desired power level upon receipt of an order. The semi-finished lens is ground or cut by a curve generator or an NC-controlled cutting tool or the like according to the necessary concave surface processing, and is subjected to smoothing (fining) as necessary, and this cutting or grinding and smoothing ( The finished surface was polished using a polishing dish with a polishing agent and a polishing cloth or a polishing tool having flexibility, mirror-finished and optically finished, and then the finish lens was also polished Semi-finished lenses are also cleaned, inspected for scratches and foreign matter, and dyeing process to color the lens as desired, hard coat to form a hardened film to cover the ease of scratching plastic lenses Shipped as a finished product through a processing process, a film formation process of an anti-reflection film that reduces the surface reflection of the lens and improves the transmittance Those used in each user is common.

  EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples. Evaluation was carried out by the following method.

  (1) Total chlorine content: About the polycarbonate resin powder or the pellet obtained in each Example, the total chlorine content was measured using the scanning fluorescent X-ray analyzer ZSX Primus II by Rigaku Denki Kogyo Co., Ltd.

  (2) Transparency: Molding obtained by molding the pellets obtained in each example at a cylinder temperature of 350 ° C., a mold temperature of 80 ° C., and a one-minute cycle using an injection molding machine J85-ELIII manufactured by Nippon Steel Works. About plate (90 mm long × 50 mm wide × 2 mm thick), Haze was measured according to ISO14782 using NDH-2000 manufactured by Nippon Denshoku Co., Ltd. The larger the value of Haze, the greater the light diffusion and the lower the transparency.

(3) High temperature heat resistance: The pellets obtained in each example were molded using a Nippon Steel Works injection molding machine J85-ELIII at a cylinder temperature of 370 ° C., a mold temperature of 80 ° C., and a 1 minute cycle (length 90 mm × Side 50 mm × thickness 2 mm). After 20 shots were continuously molded, the resin was retained in the cylinder of the injection molding machine for 10 minutes, and a molded plate after retention (length 90 mm × width 50 mm × thickness 2 mm) was formed. The hue (L, a, b) of the flat plate before and after residence is measured by C light source reflection method using SE-2000 manufactured by Nippon Denshoku Industries Co., Ltd. according to JIS K-7105, and the following: The color difference ΔE ′ was obtained from the equation. The smaller ΔE ′, the better the heat resistance.
ΔE ′ = {(ΔL) ² + (Δa) ² + (Δb) ² } ^1/2
Hue of “molded plate before stay”: L, a, b
Hue of “molded plate after residence”: L ′, a ′, b ′
ΔL: LL ′
Δa: aa ′
Δb: bb ′

(4) Boiling water resistance: Molded plate obtained by molding in a 1 minute cycle with an injection molding machine having a maximum clamping force of 85 Ton and a cylinder temperature of 350 ° C. and a mold temperature of 80 ° C. (length 90 mm × The width 50 mm × thickness 2 mm) was treated for 48 hours under conditions of a temperature of 120 ° C. and a humidity of 100% using an autoclave SN510 manufactured by Yamato Scientific Co., Ltd. The Haze before and after the treatment was measured according to ISO14782 using NDH-2000 manufactured by Nippon Denshoku Co., Ltd., and the change in the Haze before and after the treatment (ΔHaze) was determined by the following formula. It shows that it is inferior to boiling water resistance, so that (DELTA) Haze is large.
ΔHaze = Haze of the molded plate after treatment −Haze of the molded plate before treatment

  (5) Hue stability: Molding obtained by molding the pellets obtained in each example at a cylinder temperature of 300 ° C., a mold temperature of 105 ° C., and a one-minute cycle using an injection molding machine J85-ELIII manufactured by Nippon Steel Works. A plate (length 70 mm × width 50 mm × thickness 5 mm) was formed. Molding was performed continuously for 50 shots, and the YI (yellowness) of the molded plate obtained in each shot was measured with a C-light source, a viewing angle of 2 °, and a transmission method using a Color-Eye7000A manufactured by Greater Macbeth. A range of YI values obtained by measurement (difference between maximum value and minimum value) and an average value thereof were calculated.

(6) Mold corrosiveness Maximum using a mold having the shape shown in FIG. 1 (cavity size width 42 mm × length 24 mm × depth 3 mmt, insert for corrosion evaluation (20 mmφ) inserted in mold steel NAK80) After 500-shot continuous molding with an injection molding machine with a clamping force of 85 Ton, remove the corrosion evaluation insert from the mold and place it in a thermo-hygrostat set to 50 ° C x 90% RH for 2 hours. Was visually observed to determine the presence or absence of corrosion on the mold mirror surface. The criteria for determination are as follows.
○: Corrosion is less than 5% of the mirror surface. Δ: Corrosion is observed in 5 to 50% of the mirror surface. ×: Corrosion is recognized in excess of 50% of the mirror surface.

(7) Evaluation of YI (Yellowness) of Eyeglass Lens Molded Product: Using pellets obtained in each Example, using a molding machine NISSEI ES4000, diameter 70 mm, heel thickness 3 mm, frequency -1.2 A spectacle lens molded product was molded. As molding conditions, pellets plasticized and melted at 310 ° C. were injected into a mold set at a temperature of 130 ° C., and injection press molding was performed at a press stroke of 3.2 mm. The cycle time at that time was 240 seconds. The mold used was one capable of making six spectacle lens moldings with a single injection press. The YI (yellowness) of the obtained spectacle lens molded article was measured with a C light source, a viewing angle of 2 °, and a transmission method using a Color-Eye7000A manufactured by Greater Macbeth.

[Example 1]
0.0075 part of the following epoxy compound (E-1) is added to 100 parts of a polycarbonate resin granule having a viscosity average molecular weight of 23,900 and a total chlorine content of 357 ppm obtained by polymerizing bisphenol A and phosgene by an interfacial polymerization method by a conventional method. 2- (2′-hydroxy-5′-tert-octylphenyl) benzotriazole (UV-1) 0.33 part, 2- (3-tert-butyl-5-methyl-2-hydroxyphenyl) as an ultraviolet absorber ) -5-chloro-2H-benzotriazole (UV-2) 0.02 part, the following fatty acid ester release agent (R-1) 0.25 part as a release agent, the following phosphorus heat stabilizer (S-1) ) 0.02 part, and 0.70 ppm of a compound represented by the following formula (I) as a bluing agent was added and mixed thoroughly with a tumbler, and then 30 mmΦ vent Temperature 290 ° C. with a twin-screw extruder and pelletized by vacuum 4.7KPa.

[Examples 2-8, Comparative Examples 1-4]
Except for using the amounts of the polycarbonate resin particles described in Table 1, the epoxy compound, the ultraviolet absorber (A), the ultraviolet absorber (B), the fatty acid ester release agent and the phosphorus thermal stabilizer described in Table 1, The same operation as in Example 1 was performed. The evaluation results are shown in Table 1.

Each symbol shown in Table 1 represents the following compound.
(Polycarbonate resin granules)
PC-1: Polycarbonate resin powder having a viscosity average molecular weight of 23,900 and a total chlorine content of 635 ppm obtained by polymerizing bisphenol A and phosgene by an interfacial polymerization method is set in a hot air circulating dryer set at 140 ° C. in a thickness of 1 cm. Polycarbonate resin powder PC-2 with a total chlorine content of 357 ppm dried for 4 hours; a polycarbonate resin powder (epoxy compound) having a viscosity average molecular weight of 23,900 and a total chlorine content of 635 ppm obtained by polymerizing bisphenol A and phosgene by an interfacial polymerization method
E-1: Copolymer of styrene and glycidyl methacrylate (manufactured by NOF Corporation: Marproof G-0250SP (trade name))
E-2: Copolymer of methyl methacrylate and glycidyl methacrylate (manufactured by NOF Corporation: Marproof G-0150M (trade name))
E-3: Epoxidized soybean oil (manufactured by NOF Corporation: New Sizer 510R (trade name))
(Release agent)
R-1: Mixture of stearic acid triglyceride and stearyl stearate (Riken Vitamin Co., Ltd .: Riquemar SL-900 (trade name))
(Phosphorus heat stabilizer)
S-1: 71:15:14 (weight ratio) mixture of the following a-1 component, a-2 component and a-3 component a-1 component: tetrakis (2,4-di-t-butylphenyl) -4,4'-biphenylenediphosphonite, tetrakis (2,4-di-t-butylphenyl) -4,3'-biphenylenediphosphonite, and tetrakis (2,4-di-t-butylphenyl)- 100: 50: 10 (weight ratio) mixture of 3,3′-biphenylenediphosphonite a-2 component: bis (2,4-di-tert-butylphenyl) -4-phenyl-phenylphosphonite and bis (2 , 4-Di-tert-butylphenyl) -3-phenyl-phenylphosphonite 5: 3 (weight ratio) mixture a-3 component: Tris (2,4-di-tert-butylphenyl) phosphite

  The present invention is useful as a spectacle lens.

1 Gate 2 Sprue 3 Corrosion Evaluation Nest (Steel Material NAK80, 20mmφ)

Claims (5)

  (1) For 100 parts by weight of polycarbonate resin having a total chlorine content of 500 ppm or less, (2) 0.003 to 0.2 parts by weight of an epoxy compound that is a copolymer of styrene and glycidyl methacrylate, (3) 2- (2 ′ -Hydroxy-5'-tert-octylphenyl) benzotriazole 0.05 to 0.5 parts by weight, (4) 2- (3-tert-butyl-5-methyl-2-hydroxyphenyl) -5-chloro-2H -0.01 to 0.3 parts by weight of benzotriazole, (5) 0.05 to 0.5 parts by weight of a fatty acid ester release agent, and (6) 0.005 to 0.1 parts by weight of a phosphorus thermal stabilizer. A spectacle lens molded from a polycarbonate resin composition.   The spectacle lens according to claim 1, wherein the fatty acid ester release agent is a mixture of an ester of a monohydric alcohol and a saturated fatty acid and a triester of glycerin and a saturated fatty acid.   The spectacle lens according to claim 1, wherein the phosphorus-based heat stabilizer is a phosphorus-based heat stabilizer having a 2,4-di-tert-butylphenyl skeleton.   The spectacle lens according to claim 1, wherein the polycarbonate resin composition has a total chlorine content of 60 ppm or less in pellets obtained by molding the polycarbonate resin composition with a twin screw extruder.   The polycarbonate resin composition comprises a maximum YI value of 50 5 mm thick molded plates obtained by molding a pellet obtained by molding the polycarbonate resin composition with a twin screw extruder with an injection molding machine. The spectacle lens according to claim 1, wherein the difference between the minimum values is 0.15 or less.

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