WO2012077700A1 - ポリエステル樹脂及び光学レンズ - Google Patents
ポリエステル樹脂及び光学レンズ Download PDFInfo
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- WO2012077700A1 WO2012077700A1 PCT/JP2011/078254 JP2011078254W WO2012077700A1 WO 2012077700 A1 WO2012077700 A1 WO 2012077700A1 JP 2011078254 W JP2011078254 W JP 2011078254W WO 2012077700 A1 WO2012077700 A1 WO 2012077700A1
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- Prior art keywords
- polyester resin
- optical lens
- structural unit
- mol
- unit derived
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/181—Acids containing aromatic rings
- C08G63/185—Acids containing aromatic rings containing two or more aromatic rings
- C08G63/187—Acids containing aromatic rings containing two or more aromatic rings containing condensed aromatic rings
- C08G63/189—Acids containing aromatic rings containing two or more aromatic rings containing condensed aromatic rings containing a naphthalene ring
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/199—Acids or hydroxy compounds containing cycloaliphatic rings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
- C08L67/03—Polyesters derived from dicarboxylic acids and dihydroxy compounds the dicarboxylic acids and dihydroxy compounds having the carboxyl- and the hydroxy groups directly linked to aromatic rings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
Definitions
- the present invention relates to a polyester resin having a structural unit derived from a specific glycol, and particularly to a polyester resin that exhibits excellent performance when used as an optical lens. Furthermore, the present invention relates to an optical lens obtained by molding the polyester resin.
- Optical glass or optical transparent resin is used as a material for optical elements used in the optical systems of various cameras such as cameras, film-integrated cameras, and video cameras.
- Optical glass is excellent in heat resistance, transparency, dimensional stability, chemical resistance, etc., and there are many types of materials with various refractive indexes and Abbe numbers, but the material cost is high and moldability is high.
- productivity is low.
- processing to an aspheric lens used for aberration correction is a serious obstacle to practical use because it requires extremely high technology and high cost.
- optical lenses made of optical transparent resins can be mass-produced by injection molding, and have the advantage of being easy to manufacture aspherical lenses,
- polycarbonate made of bisphenol A, polymethyl methacrylate, amorphous polyolefin and the like are exemplified.
- aberration correction is performed by combining a plurality of concave and convex lenses in a camera optical system.
- the chromatic aberration produced by the convex lens is counteracted by the concave lens, so that the chromatic aberration is opposite in sign to that of the convex lens.
- the concave lens is required to have high dispersion (low Abbe number).
- Patent Document 1 discloses a polyester resin composition obtained by copolymerizing a fluorene-based dihydroxy compound having a refractive index of 1.66 and an Abbe number of about 20 as a resin used for a concave lens for aberration correction.
- This resin has a sufficiently large dispersion (low Abbe number), but has the following drawbacks as a resin for optical lenses. That is, since this resin copolymerizes a large amount of a bulky and rigid fluorene-based dihydroxy compound, the melt viscosity is very high and the moldability is poor. In order to improve the moldability, means for lowering the melt viscosity at the time of molding, that is, raising the molding temperature, can be considered.
- Patent Document 1 does not disclose an optical lens made of a thermoplastic resin having both excellent optical properties (high refractive index, low Abbe number) and practically sufficient moldability.
- Patent Document 2 discloses a polyester composed of naphthalenedicarboxylic acid, tricyclodecane dimethylol and ethylene glycol, and describes that a polyester having a high glass transition temperature, surface hardness, impact strength and transparency can be obtained.
- Patent Document 3 discloses a polyester comprising naphthalene dicarboxylic acid, tricyclodecane dimethylol and ethylene glycol.
- the former document does not examine optical applications, and its optical properties are not disclosed.
- Patent Document 4 describes that a polyester resin having an ethylene glycol-derived unit, a diol-derived unit having 3 to 16 carbon atoms, and a naphthalenedicarboxylic acid-derived unit is used. Improvements were demanded. Further, no specific example is described in which tricyclodecane dimethanol or pentacyclopentadecane dimethanol is used in combination with other units as the diol-derived unit having 3 to 16 carbon atoms.
- an object of the present invention is to provide a polyester resin that has a high refractive index and a low Abbe number, and that provides a good optical lens by molding, and an optical lens that is obtained by molding the polyester resin.
- the polyester resin of the present invention is a useful resin having a high refractive index, a low Abbe number, and a low birefringence. Further, since injection molding is possible and the thermal stability is high, the productivity is higher than that of a lens using a conventionally used glass material.
- the optical lens of the present invention is extremely useful because it can easily obtain a high refractive index low birefringence aspherical lens that is technically difficult to process with a glass lens by injection molding.
- the polyester resin of the present invention is a polyester resin mainly containing a diol constituent unit and a dicarboxylic acid constituent unit, and 70 to 95 mol% of the diol constituent unit is a constituent unit derived from ethylene glycol. 5 to 30 mol% is a structural unit derived from tricyclodecane dimethanol or pentacyclopentadecane dimethanol, and 50 mol% or more in the dicarboxylic acid structural unit is a structural unit derived from naphthalenedicarboxylic acid.
- the total ratio of the diol structural unit and the dicarboxylic acid structural unit in all the structural units of the polyester resin is preferably 80 mol% or more, more preferably 90 mol% or more, and particularly preferably 100 mol%.
- the proportion of the structural unit derived from ethylene glycol in the diol unit is preferably 80 to 95 mol%, more preferably 85 to 90 mol%, and tricyclodecane dimethanol or pentacyclopentadecanedi.
- the proportion of structural units derived from methanol is preferably 5 to 20 mol%, more preferably 10 to 15 mol%.
- the structural unit derived from tricyclodecane dimethanol or pentacyclopentadecane dimethanol is a structural unit derived from tricyclodecane dimethanol.
- a compound represented by the following formula (i) is preferable, and among the above-mentioned pentacyclopentadecane dimethanol, it is a compound represented by the following formula (ii) or (iii). It is preferable.
- Examples of the compound represented by the above formula (i) include 3,8-bis (hydroxymethyl) tricyclo [5.2.1.0 2-6 ] decane and 3,9-bis (hydroxymethyl) tricyclo [5. 2.1.0 2-6 ] decane, 4,8-bis (hydroxymethyl) tricyclo [5.2.1.0 2-6 ] decane, 4,9-bis (hydroxymethyl) tricyclo [5.2. 1.0 2-6 ] decane, 5,8-bis (hydroxymethyl) tricyclo [5.2.1.0 2-6 ] decane, 5,9-bis (hydroxymethyl) tricyclo [5.2.1. 0 2-6 ] decane, and the like.
- the tricyclodecanedimethanol may contain one or more compounds selected from these.
- Examples of the compound represented by the above formula (ii) include 4,10-bis (hydroxymethyl) pentacyclo [6.5.1.1 3-6 . 0 2-7 . 0 9-13 ] pentadecane, 4,11-bis (hydroxymethyl) pentacyclo [6.5.1.1 3-6 . 0 2-7 . 0 9-13 ] pentadecane, 4,12-bis (hydroxymethyl) pentacyclo [6.5.1.1 3-6 . 0 2-7 . 0 9-13 ] pentadecane, 5,10-bis (hydroxymethyl) pentacyclo [6.5.1.1 3-6 . 0 2-7 .
- pentadecane 5,11-bis (hydroxymethyl) pentacyclo [6.5.1.1 3-6 . 0 2-7 . 0 9-13 ] pentadecane, 5,12-bis (hydroxymethyl) pentacyclo [6.5.1.1 3-6 . 0 2-7 . 0 9-13 ] pentadecane, and the like.
- Examples of the compound represented by the above formula (iii) include 5,12-bis (hydroxymethyl) pentacyclo [9.2.1.1 4-7 . 0 2-10 . 0 3-8 ] pentadecane, 5,13-bis (hydroxymethyl) pentacyclo [9.2.1.1 4-7 . 0 2-10 .
- pentacyclopentadecanedimethanol may contain a single compound or a plurality of compounds selected from these.
- the polyester resin of the present invention has a constitution in which 50 mol% or more in the dicarboxylic acid constitutional unit is composed of a constitutional unit derived from naphthalene dicarboxylic acid, preferably 80 mol%, more preferably 90 mol% or more is derived from naphthalene dicarboxylic acid. Consists of units.
- the polyester resin of the present invention can have a high refractive index and a low Abbe number, and can be suitably used as an optical lens.
- the naphthalene dicarboxylic acid constituent unit is derived from 1,3-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid.
- a unit can be illustrated.
- a structural unit derived from 2,6-naphthalenedicarboxylic acid is particularly preferable.
- the proportion of the structural unit derived from the aromatic dicarboxylic acid in the dicarboxylic acid structural unit is preferably 80 to 100 mol%, more preferably 90 to 100%, particularly preferably 100 mol%. is there.
- dicarboxylic acid structural unit contained in the polyester resin of the present invention in addition to the structural unit derived from naphthalene dicarboxylic acid, terephthalic acid, isophthalic acid, phthalic acid, 2-methyl terephthalic acid, biphenyl dicarboxylic acid, tetralin dicarboxylic acid, etc.
- Aromatic dicarboxylic acid succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, decanedicarboxylic acid, dodecanedicarboxylic acid, cyclohexanedicarboxylic acid, decalindicarboxylic acid, norbornane dicarboxylic acid, tricyclodecanedicarboxylic acid Acid, pentacyclododecanedicarboxylic acid, 3,9-bis (1,1-dimethyl-2-carboxyethyl) -2,4,8,10-tetraoxaspiro [5.5] undecane, 5-carboxy-5- Ethyl-2- (1, - dimethyl-2-carboxyethyl) -1,3-dioxane, a structural unit derived from an aliphatic dicarboxylic acid such as dimer acid.
- the polyester resin has a monoalcohol structural unit such as butyl alcohol, hexyl alcohol, and octyl alcohol, trimethylolpropane, glycerin, 1, 3 within the range not impairing the object of the present invention.
- a monoalcohol structural unit such as butyl alcohol, hexyl alcohol, and octyl alcohol, trimethylolpropane, glycerin, 1, 3 within the range not impairing the object of the present invention.
- the refractive index of the polyester resin used in the present invention is usually 1.60 or more, preferably 1.63 or more, more preferably 1.64 or more. is there.
- the upper limit of the refractive index is not particularly limited, but is preferably 1.7 or less in view of balance with other physical properties.
- the Abbe number is 25 or less, preferably 21 or less, more preferably 20 or less.
- the lower limit of the Abbe number is not particularly limited, but is preferably 18 or more in view of balance with other physical properties.
- a refractive index and an Abbe number are based on the following measuring methods.
- a polyester resin injection-molded piece annealed in an oven at a temperature about 20 ° C. lower than the glass transition temperature of the resin for 10 hours is used as a measurement sample, and the refractive index is a value measured at 589 nm (d line). Is a value calculated from the refractive index measured at 656 nm (C line), 486 nm (F line), and d line.
- the refractive index measured in this way is preferably 1.60 or more and the Abbe number is 21 or less.
- the glass transition temperature measured with the differential scanning calorimeter of the polyester resin of the present invention is not particularly limited, but is usually 110 ° C. or higher, preferably 115 ° C. or higher, more preferably 120 ° C. or higher.
- the optical lens of the present invention can sufficiently withstand surface processing such as hard coating.
- the glass transition temperature of the polyester resin can be easily set to 110 ° C. or higher by appropriately selecting a conventionally known diol or dicarboxylic acid such as a diol having a cyclic acetal skeleton or an aromatic hydrocarbon group or a dicarboxylic acid having a naphthalene skeleton. Can do.
- the intrinsic viscosity (IV) of the polyester resin of the present invention is not particularly limited, but injection molding is selected as the molding method of the optical lens, and the mechanical performance of the optical lens is sufficiently exhibited. Is taken into consideration, the measured value at 25 ° C. using a mixed solvent of phenol and 1,1,2,2-tetrachloroethane in a mass ratio of 6: 4 is in the range of 0.20 to 1.2 dl / g. preferable. Further, in consideration of suppressing the expression of birefringence during molding, the intrinsic viscosity (IV) of the polyester resin of the present invention is preferably in the range of 0.20 to 1.0 dl / g, more preferably.
- the polyester resin of the present invention is excellent in the balance of moldability, mechanical performance, and low birefringence.
- the intrinsic viscosity is equal to or higher than the upper limit, the development of birefringence during molding cannot be suppressed, and an optical lens having a large birefringence may be formed, which is not preferable.
- the intrinsic viscosity is less than the lower limit, the mechanical performance of the optical lens may not be sufficiently exhibited, which is not preferable.
- the semi-crystallization time of the polyester resin used in the present invention is preferably 30 minutes or more, more preferably 70 minutes or more, and still more preferably 90 minutes or more, as measured by the method shown below.
- the upper limit of the half crystallization time of the present invention is not particularly limited, but generally falls within 1000 minutes.
- the polyester resin of the present invention preferably satisfies the following physical properties (1) and (2).
- (1) In the plastic transition temperature measurement method according to JIS standard K7121, the measured value of the midpoint glass transition temperature is 120 ° C. or higher.
- (2) The measured value of intrinsic viscosity (IV) at 25 ° C. using a mixed solvent of phenol and 1,1,2,2-tetrachloroethane in a mass ratio of 6: 4 is 0.2 to 1.0 dl / g. Indicates.
- the method for producing the polyester resin of the present invention is not particularly limited, and conventionally known polyester production methods can be applied. Examples thereof include a melt polymerization method such as a transesterification method and a direct esterification method, or a solution polymerization method, and the transesterification method is particularly preferable.
- Various catalysts such as transesterification catalysts, esterification catalysts, polycondensation catalysts, etc., etherification inhibitors, heat stabilizers, light stabilizers, and other stabilizers used in the production, polymerization regulators, etc., may be those conventionally known. These can be appropriately selected according to the reaction rate, the color tone of the polyester resin, safety, thermal stability, weather resistance, self-elution properties, and the like.
- various catalysts include compounds of metals such as zinc, lead, cerium, cadmium, manganese, cobalt, lithium, sodium, potassium, calcium, nickel, magnesium, vanadium, aluminum, titanium, antimony, tin (for example, fatty acid salts, Carbonates, phosphates, hydroxides, chlorides, oxides, alkoxides), magnesium metal, and the like. These can be used alone or in combination.
- the amount of the transesterification catalyst used in the transesterification method is preferably 0.001 to 1 mol%, more preferably 0.005 to 0.5 mol% with respect to the dicarboxylic acid unit. preferable.
- the amount of the polycondensation catalyst used is preferably 0.001 to 1 mol%, more preferably 0.005 to 0.5 mol%, more preferably 0.005 to 0.5 mol% based on the dicarboxylic acid unit.
- the polyester resin of the present invention includes other resins, antioxidants, light stabilizers, ultraviolet absorbers, plasticizers, extenders, matting agents, drying regulators, antistatic agents, antisettling agents, surfactants, Various additives such as flow improvers, drying oils, waxes, fillers, colorants, reinforcing agents, surface smoothing agents, leveling agents, curing reaction accelerators, thickeners, and molding aids can be added.
- an ester of a polyfunctional alcohol and a fatty acid, particularly a stearic ester of glycerin, as a flow improver in an amount of 5000 ppm or less, preferably 3000 ppm or less because troubles due to poor mold release can be reduced.
- the polyester resin used in the present invention is desired to have as little foreign matter content as possible, and it is preferable to perform filtration of the molten raw material, filtration of the catalyst solution, and filtration of the molten oligomer.
- the filter mesh used for filtration is preferably 7 ⁇ m or less, more preferably 5 ⁇ m or less.
- the mesh of the polymer filter is preferably 100 ⁇ m or less, more preferably 30 ⁇ m or less.
- the step of collecting the resin pellets must naturally be a low dust environment, and is preferably class 1000 or less, more preferably class 100 or less.
- the polyester resin of the present invention can be used for various applications.
- it can be used for injection molded articles, sheets, films, extruded molded articles such as pipes, bottles, foams, adhesives, adhesives, paints and the like.
- the sheet may be a single layer or a multilayer
- the film may be a single layer or a multilayer.
- the sheet may be unstretched, or may be stretched in one direction or in two directions. May be.
- the bottle may be a direct blow bottle, an injection blow bottle, or an injection molded bottle.
- the foam may be a bead foam or an extruded foam.
- products that require high heat resistance and water vapor barrier properties such as products used in automobiles, packaging materials for import / export, electronic materials such as solar cell backsheets, food packaging materials for retort processing and microwave heating. It can be used suitably.
- the polyester resin of the present invention can be obtained by injection molding into a lens shape with an injection molding machine or an injection compression molding machine.
- the molding environment must naturally be a low dust environment, preferably class 1000 or less, more preferably class 100 or less.
- the optical lens obtained by molding the polyester resin of the present invention is particularly preferably implemented by using an aspherical lens as necessary. Since an aspheric lens can substantially eliminate spherical aberration with a single lens, there is no need to remove spherical aberration with a combination of a plurality of spherical lenses, thus reducing weight and reducing production costs. It becomes possible. Therefore, the aspherical lens is particularly useful as a camera lens among optical lenses.
- the astigmatism of the aspheric lens is preferably 0 to 15 m ⁇ , more preferably 0 to 10 m ⁇ .
- the surface of the optical lens obtained by molding the polyester resin of the present invention may be provided with a coating layer such as an antireflection layer or a hard coating layer, if necessary.
- the antireflection layer may be a single layer or a multilayer, and may be organic or inorganic, but is preferably inorganic. Specific examples include oxides or fluorides such as silicon oxide, aluminum oxide, zirconium oxide, titanium oxide, cerium oxide, magnesium oxide, and magnesium fluoride.
- the optical lens obtained by molding the polyester resin of the present invention can be used for various lenses such as a pickup lens, f- ⁇ lens, and spectacle lens. However, since it has a high refractive index and a low Abbe number, it has chromatic aberration. It can be particularly suitably used as a correction lens. Specifically, it is suitably used as a lens for a single-lens reflex camera, a digital still camera, a video camera, a camera-equipped mobile phone, a lens-equipped film, a telescope, a binocular, a microscope, a projector, or the like.
- the optical lens of the present invention is a concave lens, it can be used as an optical lens system with little chromatic aberration in combination with other high Abbe number convex lenses.
- the Abbe number of the convex lens to be combined is preferably 40 to 60, and more preferably 50 to 60.
- the evaluation methods of the polyester resin and optical lens used in this example are as follows. ⁇ Evaluation method of polyester resin> (1) Resin Composition The proportions of ethylene glycol structural units, other diol structural units, and naphthalenedicarboxylic acid structural units in the polyester resin were calculated by 1 H-NMR measurement. The measurement was performed at 400 MHz using JNM-AL400 manufactured by JEOL Ltd. Deuterated chloroform and deuterated trifluoroacetic acid were used as the solvent. (2) Glass transition temperature (Tg) The glass transition temperature of the polyester resin is DSC / TA-60WS manufactured by Shimadzu Corporation.
- polyester resin About 10 mg of the polyester resin is placed in an aluminum non-sealed container and heated in a nitrogen gas (30 ml / min) stream at a rate of temperature increase of 20 ° C./min. The sample heated and melted to 280 ° C. was rapidly cooled to obtain a measurement sample. The sample was measured under the same conditions, and the midpoint glass transition temperature was calculated based on JIS standard K7121. (3) Refractive index, Abbe number After the obtained polyester resin was vacuum-dried at a temperature about 20 ° C. lower than the glass transition temperature of the resin for 10 hours, the cylinder temperature was 280 ° C. at SH50 manufactured by Sumitomo Heavy Industries, Ltd. The mold temperature was 20 to 50 ° C.
- a glass flask equipped with a gas introduction tube was charged with the raw material monomers listed in Table 1, and heated to 215 ° C. in a nitrogen atmosphere in the presence of 0.03 mol% of manganese acetate tetrahydrate with respect to the dicarboxylic acid component. The transesterification reaction was performed.
- polyester resins obtained in Examples 1 to 7 and Comparative Examples 1 to 5 and 7 were vacuum dried at a temperature 20 ° C. lower than the glass transition temperature of the resin for 10 hours, and then SH50 manufactured by Sumitomo Heavy Industries, Ltd. Injection molding was performed with a cylinder temperature of 260 ° C. and a mold temperature of 35 ° C. lower than the glass transition temperature of the resin to obtain a biconvex lens having a diameter of 28 mm and a curvature radius of both convex surfaces of 20 mm.
- the evaluation results are shown in Table 1.
- the polyester resins of Examples 1 to 7 are materials having a lower Abbe number and a good appearance as compared with the polyester resins of Comparative Examples 1 to 5 and 7, and a longer half-crystallization time. The heat stability was good and the moldability was excellent. In Comparative Example 6, copolymerization was not carried out. Moreover, as shown in Table 2, the polyester resin of Comparative Example 2 has a higher defect frequency than Example 4. This is presumably because when the injection speed is high, the frictional heat increases, and the polyester resin having poor thermal stability undergoes thermal decomposition to cause molding defects.
- NDCM Dimethyl 2,6-naphthalenedicarboxylate (Mitsubishi Gas Chemical Co., Ltd.)
- DMT Dimethyl terephthalate (manufactured by Showa Chemical Co., Ltd.)
- TCDDM tricyclodecane dimethanol represented by formula (i) (manufactured by Oxea Japan Co., Ltd.)
- PCPDM penentacyclopentadecanedimethanol: synthesized by referring to the synthesis method described in Japanese Patent No.
- SPG 3,9-bis (1,1-dimethyl-2-hydroxyethyl) -2,4,8,10-tetraoxaspiro [5.5] undecane (manufactured by Mitsubishi Gas Chemical Co., Inc.)
- EG Ethylene glycol (manufactured by Maruzen Oil Chemical Co., Ltd.)
- MPO 2-methyl-1,3-propanediol (manufactured by Maruzen Oil Chemical Co., Ltd.)
- NPG Neopentyl glycol (Mitsubishi Gas Chemical Co., Ltd.)
- CHDM 1,4-cyclohexanedimethanol (manufactured by Sigma-Aldrich Japan)
- BPA 4,4′-isopropylidenediphenol (manufactured by Sigma-Aldrich Japan)
- the polyester resin of the present invention can provide an optical lens having high thermal stability and excellent moldability, a low Abbe number and a high refractive index. For this reason, it can be used in fields where expensive high refractive index glass lenses have been used, such as cameras, telescopes, binoculars, and television projectors.
- the optical lens of the present invention is useful as a high refractive index low birefringence aspheric lens, and particularly useful as a concave lens for correcting chromatic aberration.
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Abstract
Description
また、特許文献4には、エチレングリコール由来単位と炭素数3~16のジオール由来単位とナフタレンジカルボン酸由来単位とを有するポリエステル樹脂を用いることが記載されているが、熱安定性など成形性の向上などが求められていた。また、炭素数3~16のジオール由来単位としてトリシクロデカンジメタノールやペンタシクロペンタデカンジメタノールを、他の単位と組み合わせて用いた具体的な例は記載されていない。
1.主としてジオール構成単位とジカルボン酸構成単位とを含むポリエステル樹脂であって、ジオール構成単位中の70~95モル%がエチレングリコールに由来する構成単位であり、ジオール構成単位中の5~30モル%がトリシクロデカンジメタノールまたはペンタシクロペンタデカンジメタノールに由来する構成単位であり、ジカルボン酸構成単位中の50モル%以上がナフタレンジカルボン酸に由来する構成単位であるポリエステル樹脂。
3.上記2に記載の光学レンズと他の光学レンズを組み合わせた光学レンズ系。
上記式(iii)で表される化合物としては、5,12-ビス(ヒドロキシメチル)ペンタシクロ[9.2.1.14-7.02-10.03-8]ペンタデカン、5,13-ビス(ヒドロキシメチル)ペンタシクロ[9.2.1.14-7.02-10.03-8]ペンタデカン、6,12-ビス(ヒドロキシメチル)ペンタシクロ[9.2.1.14-7.02-10.03-8]ペンタデカン、6,13-ビス(ヒドロキシメチル)ペンタシクロ[9.2.1.14-7.02-10.03-8]ペンタデカン、などが挙げられる。
上記ペンタシクロペンタデカンジメタノールは、これらから選ばれる単独または複数の化合物を含んでよい。
ナフタレンジカルボン酸構成単位としては1,3-ナフタレンジカルボン酸、1,4-ナフタレンジカルボン酸、1,5-ナフタレンジカルボン酸、2,6-ナフタレンジカルボン酸、2,7-ナフタレンジカルボン酸に由来する構成単位が例示できる。屈折率、アッベ数、耐熱性、機械的性能、経済性を考慮すると、上記した中では2,6-ナフタレンジカルボン酸に由来する構成単位が特に好ましい。
さらに本発明のポリエステル樹脂において、ジカルボン酸構成単位中の芳香族ジカルボン酸に由来する構成単位の割合は、好ましくは80~100モル%、より好ましくは90~100%、特に好ましくは100モル%である。
なお、屈折率、アッベ数は以下の測定方法による。ポリエステル樹脂の射出成形片を樹脂のガラス転移温度より約20℃低い温度としたオーブンで10時間アニール処理したものを測定サンプルとし、屈折率は589nm(d線)で測定した値であり、アッベ数は656nm(C線)、486nm(F線)、及びd線で測定した屈折率から算出した値である。
本発明のポリエステル樹脂においては、このように測定した屈折率が1.60以上であり、かつアッベ数が21以下であると好ましい。
極限粘度がこの範囲にある場合、本発明のポリエステル樹脂は成形性、機械的性能、及び低複屈折性のバランスに優れる。極限粘度が上限以上の場合、成形時の複屈折の発現を抑制できず、複屈折の大きな光学レンズとなる事があり好ましくない。極限粘度が下限以下の場合、光学レンズの機械的性能が十分に発揮されない事があり好ましくない。
本発明の半結晶化時間の上限は特に限定されるものではないが、概ね1000分以下に収まる。
(1)JIS規格K7121にあるプラスチックの転移温度測定方法において、中間点ガラス転移温度の測定値が120℃以上を示す。
(2)フェノールと1,1,2,2-テトラクロロエタンとの質量比6:4の混合溶媒を用いた25℃での極限粘度(IV)の測定値が0.2~1.0dl/gを示す。
本発明のポリエステル樹脂には、その他の樹脂、酸化防止剤、光安定剤、紫外線吸収剤、可塑剤、増量剤、艶消し剤、乾燥調節剤、帯電防止剤、沈降防止剤、界面活性剤、流れ改良剤、乾燥油、ワックス類、フィラー、着色剤、補強剤、表面平滑剤、レベリング剤、硬化反応促進剤、増粘剤などの各種添加剤、成形助剤を添加する事もできる。流れ改良剤として多官能アルコールと脂肪酸のエステル、特にはグリセリンのステアリン酸エステルを5000ppm以下、好ましくは3000ppm以下添加する事が離型不良によるトラブルを低減する事ができ好ましい。
<ポリエステル樹脂の評価方法>
(1)樹脂組成
ポリエステル樹脂中のエチレングリコール構成単位、他のジオール構成単位、ナフタレンジカルボン酸構成単位の割合は1H-NMR測定にて算出した。測定装置は日本電子(株)製JNM-AL400を用い、400MHzで測定した。溶媒には重クロロホルム及び重トリフルオロ酢酸を用いた。
(2)ガラス転移温度(Tg)
ポリエステル樹脂のガラス転移温度は島津製作所製DSC/TA-60WSを使用し、ポリエステル樹脂約10mgをアルミニウム製非密封容器に入れ、窒素ガス(30ml/min)気流中、昇温速度20℃/minで280℃まで加熱、溶融したものを急冷して測定用試料とした。該試料を同条件で測定し、JIS規格K7121に基づき中間点ガラス転移温度を算出した。
(3)屈折率、アッベ数
得られたポリエステル樹脂を樹脂のガラス転移温度より約20℃低い温度で10時間真空乾燥した後、住友重機械工業(株)製SH50にて、シリンダー温度280℃、金型温度を樹脂のガラス転移温度より20~50℃低い温度として射出成形し、一辺が20mmの直角二等辺三角形(3mm厚)に成形した。この成形片をガラス転移温度より約20℃低い温度のオーブンで10時間アニール処理した物を測定サンプルとした。屈折率、アッベ数の測定はATAGO(株)製屈折率計を用い、屈折率は589nm(d線)で測定し、アッベ数は656nm(C線)、486nm(F線)、及びd線で測定した屈折率から算出した。
(4)極限粘度(IV)
フェノール/テトラクロロエタン=6/4(重量比)混合溶媒にポリエステル樹脂を溶解させ25℃に保持し、ウベローデ型粘度計を使用して測定した。
(5)半結晶化時間
半結晶化時間は結晶化速度測定装置(ヘキサ科学(有)製WK-701)により測定した。ポリエステル樹脂を200℃で熱プレスして得られた厚さ100~1000μmのフィルム試料を2枚のスライドガラスに挟み、300℃で3分間加熱溶融後180℃の油浴に浸した。これに偏光板(ポーラライザー)を通した光を透過させ、この透過光の偏光板(アナライザー)通過後の光量を受光素子により検出し、試験開始時の光量と透過光量が最低となった時の光量の中間値の光量に達するまでの時間を半結晶化時間とした。半結晶化時間が180分を超えたときは「>180」とした。
<光学レンズの評価方法>
(1)外観評価
光学レンズの外観を目視で観察し、評価した。
充填塔式精留塔、分縮器、全縮器、コールドトラップ、撹拌機、加熱装置、窒素導入管を備えたポリエステル製造装置もしくは加熱装置、撹拌翼、分縮器、トラップ、温度計および窒素ガス導入管を備えたガラス製フラスコに表1に記載の原料モノマーを仕込み、ジカルボン酸成分に対し酢酸マンガン四水和物0.03モル%の存在下、窒素雰囲気下で215℃迄昇温してエステル交換反応を行った。ジカルボン酸成分の反応転化率を90%以上とした後、ジカルボン酸成分に対して酸化アンチモン(III)0.02モル%とリン酸トリエチル0.06モル%を加え、昇温と減圧を徐々に行い、最終的に250~280℃、0.1kPa以下で重縮合を行った。適度な溶融粘度となった時点で反応を終了し、ポリエステル樹脂を回収した。
評価結果を表1に示す。
実施例1~7、比較例1~5及び7で得られたポリエステル樹脂を樹脂のガラス転移温度より20℃低い温度で10時間真空乾燥した後、住友重機械工業(株)製SH50にて、シリンダー温度260℃、金型温度を樹脂のガラス転移温度より35℃低い温度として射出成形し、直径が28mm、両凸面の曲率半径が20mmの両凸レンズを得た。評価結果を表1に示す。
実施例4及び比較例2で得られたポリエステル樹脂を樹脂のガラス転移温度より20℃低い温度で8時間真空乾燥した後、住友重機械工業(株)製SH50にて、表2に示すシリンダー温度、金型温度及び圧力で保圧し、射出速度1、5、10、20及び30(mm/s)にて射出成形し、成形を行った回数に対して、成形片の破断、金型への貼り付きなど、成形を繰り返す際の障害が発生した回数を成形不良頻度とした。評価結果を表2に示す。
NDCM:2,6-ナフタレンジカルボン酸ジメチル(三菱ガス化学(株)製)
DMT:テレフタル酸ジメチル(昭和化学(株)製)
TCDDM:式(i)で表されるトリシクロデカンジメタノール(オクセア・ジャパン(株)製)
PCPDM:(ペンタシクロペンタデカンジメタノール:特許第4431844号に記載された合成方法を参照し、合成した。)
SPG:3,9-ビス(1,1-ジメチル-2-ヒドロキシエチル)-2,4,8,10-テトラオキサスピロ〔5.5〕ウンデカン(三菱ガス化学(株)製)
EG:エチレングリコール(丸善油化学(株)製)
MPO:2-メチル-1,3-プロパンジオール(丸善油化学(株)製)
NPG:ネオペンチルグリコール(三菱ガス化学(株)製)
CHDM:1,4-シクロヘキサンジメタノール(シグマ・アルドリッチ・ジャパン(株)製)
BPA:4,4’-イソプロピリデンジフェノール(シグマ・アルドリッチ・ジャパン(株)製)
Claims (12)
- 主としてジオール構成単位とジカルボン酸構成単位とを含むポリエステル樹脂であって、ジオール構成単位中の70~95モル%がエチレングリコールに由来する構成単位であり、ジオール構成単位中の5~30モル%がトリシクロデカンジメタノールまたはペンタシクロペンタデカンジメタノールに由来する構成単位であり、ジカルボン酸構成単位中の50モル%以上がナフタレンジカルボン酸に由来する構成単位であるポリエステル樹脂。
- ナフタレンジカルボン酸が2,6-ナフタレンジカルボン酸である請求項1に記載のポリエステル樹脂。
- ジカルボン酸構成単位中の90モル%以上がナフタレンジカルボン酸に由来する構成単位である請求項1に記載のポリエステル樹脂。
- 前記トリシクロデカンジメタノールまたはペンタシクロペンタデカンジメタノールに由来する構成単位が、トリシクロデカンジメタノールに由来する構成単位である請求項1記載のポリエステル樹脂。
- ジオール構成単位中の5~20モル%がトリシクロデカンジメタノールに由来する構成単位である請求項4に記載のポリエステル樹脂。
- ジオール構成単位中の10~15モル%がトリシクロデカンジメタノールに由来する構成単位である請求項4に記載のポリエステル樹脂。
- 以下の(1)および(2)の物性を有する請求項の1に記載のポリエステル樹脂。
(1)JIS規格K7121にあるプラスチックの転移温度測定方法において、中間点ガラス転移温度の測定値が120℃以上を示す。
(2)フェノールと1,1,2,2-テトラクロロエタンとの質量比6:4の混合溶媒を用いた25℃での極限粘度(IV)の測定値が0.2~1.0dl/gを示す。 - 請求項1に記載のポリエステル樹脂を成形して得られる光学レンズ。
- ポリエステル樹脂の成形片をポリエステル樹脂のガラス転移温度よりも約20度低い温度で10時間アニール処理した試験片の屈折率が1.60以上であり、かつアッベ数が21以下であるの請求項8に記載の光学レンズ。
- 光学レンズが非球面レンズである請求項9に記載の光学レンズ。
- 光学レンズがカメラ用レンズである請求項9に記載の光学レンズ。
- 請求項8~11のいずれかに記載の光学レンズと他の光学レンズを組み合わせた光学レンズ系。
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WO2015053389A1 (ja) * | 2013-10-11 | 2015-04-16 | 三菱瓦斯化学株式会社 | ポリエステル樹脂、射出成形体、ポリエステル製シート及びポリエステル製容器 |
JPWO2015163323A1 (ja) * | 2014-04-24 | 2017-04-20 | 三菱瓦斯化学株式会社 | ポリエステル樹脂、光学レンズ及び光学レンズ系 |
KR20170066280A (ko) * | 2014-09-30 | 2017-06-14 | 미츠비시 가스 가가쿠 가부시키가이샤 | 폴리카보네이트 수지 및 광학 렌즈 |
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Also Published As
Publication number | Publication date |
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JP5849967B2 (ja) | 2016-02-03 |
JPWO2012077700A1 (ja) | 2014-05-22 |
KR20140009210A (ko) | 2014-01-22 |
CN103298851A (zh) | 2013-09-11 |
US20130321934A1 (en) | 2013-12-05 |
US9030762B2 (en) | 2015-05-12 |
CN103298851B (zh) | 2015-03-04 |
TW201231495A (en) | 2012-08-01 |
EP2650317A1 (en) | 2013-10-16 |
TWI513730B (zh) | 2015-12-21 |
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