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WO2012169279A1 - Composition de résine, composition de résine pour tête de lecture optique, et corps moulé pour tête de lecture optique - Google Patents

Composition de résine, composition de résine pour tête de lecture optique, et corps moulé pour tête de lecture optique Download PDF

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Publication number
WO2012169279A1
WO2012169279A1 PCT/JP2012/059404 JP2012059404W WO2012169279A1 WO 2012169279 A1 WO2012169279 A1 WO 2012169279A1 JP 2012059404 W JP2012059404 W JP 2012059404W WO 2012169279 A1 WO2012169279 A1 WO 2012169279A1
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Prior art keywords
resin composition
optical pickup
mass
parts
liquid crystal
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Ceased
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PCT/JP2012/059404
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English (en)
Japanese (ja)
Inventor
木ノ内　智
小坂　亘
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Idemitsu Kosan Co Ltd
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Idemitsu Kosan Co Ltd
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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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
    • C08J5/043—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with glass fibres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L81/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen or carbon only; Compositions of polysulfones; Compositions of derivatives of such polymers
    • C08L81/04—Polysulfides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C08J2367/03—Polyesters derived from dicarboxylic acids and dihydroxy compounds the dicarboxylic acids and dihydroxy compounds having the hydroxy and the carboxyl groups directly linked to aromatic rings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2481/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen, or carbon only; Polysulfones; Derivatives of such polymers
    • C08J2481/04—Polysulfides
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/22—Apparatus or processes for the manufacture of optical heads, e.g. assembly

Definitions

  • the present invention relates to a resin composition, a resin composition for optical pickup, and a molded article for optical pickup formed by molding the resin composition.
  • optical pickups such as CD, DVD, and Blu-Ray have been manufactured by metal die casting such as aluminum die casting and zinc die casting.
  • metal die casting such as aluminum die casting and zinc die casting.
  • resin materials for optical pickups have dimensional accuracy, dimensional stability, moldability (fluidity), mechanical strength, rigidity, and environmental resistance during (injection) molding, depending on the function of each optical component. Characteristics such as (heat resistance, moisture resistance, chemical resistance, etc.), heat dissipation, and flame retardancy are required. Further, in recent years, when the recording density and speeding up of CD, DVD, etc.
  • liquid crystal polymer (LCP) resin composition may be used mainly for improving moldability and low burr, and a plate is used to reduce anisotropy in the LCP resin composition.
  • a resin composition improved by adding a filler in a shape is also known (see Patent Document 2).
  • PPS resin compositions for optical pickups that have been used in the past have not been able to improve the above characteristics, particularly dimensional stability, moldability (fluidity), mechanical strength, heat dissipation, etc. in a well-balanced manner.
  • it is difficult to apply to thin products such as optical pickup parts of slim type (molded product height (maximum thickness) about 5 mm) and ultra slim type (molded product height (maximum thickness) of about 3 mm). It was.
  • the LCP resin composition is superior to the PPS resin composition in terms of moldability and low burr, but due to its low adhesiveness, the fixing accuracy of the optical component is not sufficiently exhibited, or the anisotropy of the material characteristics Therefore, there is a problem that the optical characteristics are not sufficiently developed because the molded product is deformed, and it can be applied only to extremely limited uses such as a lens holder.
  • the subject of this invention is a resin composition excellent in dimensional stability, moldability (especially thin moldability), mechanical strength, adhesiveness, and heat dissipation, the resin composition for optical pick-ups, and this resin composition.
  • An object of the present invention is to provide a molded article for an optical pickup which is molded and has low burr properties, optical axis deviation is suppressed, and excellent weld strength.
  • the present inventors have found that if the resin composition contains a liquid crystal polymer (LCP), polyarylene sulfide and graphite, good characteristics for optical pickup, that is, dimensional stability, It is excellent in moldability (particularly thin-wall moldability), mechanical strength, adhesiveness and heat dissipation, and if it is a molded article for optical pickups formed by molding the resin composition, it has low burr and optical axis misalignment. Has been found to be suppressed and the weld strength is excellent, and the present invention has been completed.
  • LCP liquid crystal polymer
  • polyarylene sulfide polyarylene sulfide and graphite
  • the present invention relates to the following [1] to [5].
  • [1] It comprises 100 parts by mass of (A) a liquid crystal polymer 60 to 96% by mass and (B) a polyarylene sulfide 40 to 4% by mass, and (C) graphite 30 to 60 parts by mass.
  • a resin composition [2] The resin composition according to [1], which is used for an optical pickup. [3] The resin composition according to [1] or [2], further comprising (D) 30 to 50 parts by mass of a non-fibrous inorganic filler. [4] The resin composition according to any one of [1] to [3], further comprising (E) 20 to 50 parts by mass of a fibrous inorganic filler. [5] A molded article for an optical pickup obtained by molding the resin composition according to any one of [1] to [4].
  • a resin composition and an optical pickup resin composition that are excellent in dimensional stability, moldability (particularly thin-wall moldability), mechanical strength, adhesiveness, and heat dissipation, and low burr properties, optical axis It is possible to provide a molded article for an optical pickup that is suppressed in deviation and excellent in weld strength.
  • the resin composition it is possible to provide an optical pickup of a slim type (a molded product height (maximum thickness) of about 5 mm) or an ultra slim type (a molded product height (maximum thickness) of about 3 mm).
  • the resin composition of the present invention comprises (A) 60 to 96% by mass of a liquid crystal polymer and (B) 100 parts by mass of a resin composition comprising 40 to 4% by mass of polyarylene sulfide, and (C) 30 to 60 parts by mass of graphite. It is a resin composition characterized by containing. First, each component of the resin composition of this invention is demonstrated in detail below.
  • the liquid crystal polymer exhibits a liquid crystal-like property in which a linear chain of molecules is regularly arranged in a molten state, and is usually an aromatic polyester-based resin, and is also referred to as a liquid crystal polyester.
  • a thermotropic liquid crystal polymer thermotropic liquid crystal polyester
  • the liquid crystal polymer those that form an anisotropic melt at a temperature of 400 ° C. or lower are preferably used.
  • the liquid crystal polymer includes (1) a structural unit derived from an aromatic hydroxycarboxylic acid [hereinafter sometimes referred to as a structural unit (1)], (2) a structural unit derived from an aromatic dicarboxylic acid [hereinafter referred to as a structural unit ( 2)], and (3) at least one of structural units derived from an aromatic diol [hereinafter sometimes referred to as structural unit (3)].
  • a structural unit (1) a structural unit derived from an aromatic hydroxycarboxylic acid
  • a structural unit ( 2) a structural unit derived from an aromatic dicarboxylic acid
  • structural unit (3) at least one of structural units derived from an aromatic diol
  • Examples of the structural unit derived from the (1) aromatic hydroxycarboxylic acid include structural units represented by the following formulae. These structural units may have a substituent such as an alkyl group, a halogen atom, or an aryl group on the aromatic ring.
  • Examples of the alkyl group include a methyl group, an ethyl group, various propyl groups (“various” indicates linear and all branched chains, the same shall apply hereinafter), various butyl groups, various pentyl groups, and the like.
  • An alkyl group having 1 to 5 carbon atoms is preferable, an alkyl group having 1 to 3 carbon atoms is more preferable, and a methyl group is more preferable.
  • halogen atom examples include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
  • aryl group examples include a phenyl group, a naphthyl group, and a biphenylene group. An aryl group having 6 to 20 ring carbon atoms is preferable, an aryl group having 6 to 12 ring carbon atoms is more preferable, and a phenyl group is more preferable.
  • the liquid crystal polymer may have (1) only one structural unit derived from aromatic hydroxycarboxylic acid, or may have two or more.
  • Examples of the structural unit derived from the aromatic dicarboxylic acid (2) include structural units represented by the following formulas. These structural units may have a substituent such as an alkyl group, a halogen atom, or an aryl group on the aromatic ring. Examples of the alkyl group, halogen atom and aryl group are the same as those described above, and preferred ones are also the same.
  • the liquid crystal polymer may have only one structural unit derived from (2) an aromatic dicarboxylic acid, or may have two or more.
  • Examples of the structural unit derived from the (3) aromatic diol include structural units represented by the following formulae. These structural units may have a substituent such as an alkyl group, a halogen atom, or an aryl group on the aromatic ring. Examples of the alkyl group, halogen atom and aryl group are the same as those described above, and preferred ones are also the same.
  • the liquid crystal polymer may have only one structural unit derived from (3) an aromatic diol, or may have two or more.
  • the heat resistance of the liquid crystal polymer and the resin composition in order to increase the flow start temperature of the liquid crystal polymer, it is preferable to improve the linearity of the molecular chain. It preferably has no substituent.
  • liquid crystal polymer (liquid crystal polyester)
  • An acylated product is obtained by acylating a phenolic hydroxyl group possessed by an aromatic diol or aromatic hydroxycarboxylic acid with a fatty acid anhydride such as acetic anhydride, and the resulting acylated product has an aromatic group and an aromatic group.
  • a liquid crystal polymer can be produced by polymerizing the carboxyl group of the acylated product of dicarboxylic acid or aromatic hydroxycarboxylic acid so as to cause transesterification.
  • the liquid crystal polymer (liquid crystal polyester) is marketed, and a commercial item may be used.
  • ((B) polyarylene sulfide) Component (B) is a structural formula — [Ar—S] — (wherein Ar represents an arylene group having 6 to 12 ring carbon atoms) from the viewpoint of heat resistance and mechanical properties of polyarylene sulfide and the resin composition.
  • the polymer containing 70 mol% or more (more preferably 90 mol% or more) of the repeating unit represented by formula (I) is preferred, and the repeating unit represented by the following structural formula (I) is 70 mol% or more (more preferably). 90 mol% or more) is more preferable, and polyphenylene sulfide (PPS) is more preferable.
  • R 1 represents an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, a phenyl group, a carboxyl group, a carboxylate metal base, an amino group, a nitro group, or a halogen atom. Represents an integer of 0 to 4.
  • Examples of the alkyl group having 1 to 5 carbon atoms represented by R 1 include a methyl group, an ethyl group, various propyl groups, various butyl groups, and various pentyl groups.
  • Examples of the alkoxy group having 1 to 5 carbon atoms include methoxy group, ethoxy group, various propoxy groups, various butoxy groups, and various pentyloxy groups.
  • Examples of the metal salt of the carboxylic acid metal base include alkali metal salts such as sodium salt and potassium salt.
  • Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
  • m is preferably 0 or 1, more preferably 0.
  • the repeating unit represented by the structural formula (I) is preferably a repeating unit represented by the following structural formula (I ′). (In the formula, R 1 and m are as defined above, and preferred ones are also the same.)
  • Polyarylene sulfide is generally linear according to its production method, and has a molecular structure that does not have a branched or crosslinked structure (linear type), and has a structure that has a branched or crosslinked structure by a thermal crosslinking method (crosslinked type).
  • the semi-linear type (semi-crosslinked type) is known, but any type of the type is effective in the present invention.
  • a branched or cross-linked polyarylene sulfide obtained by polymerization using a small amount of monomers having three or more functional groups can also be effectively used as the monomer.
  • the polyarylene sulfide is preferably a linear type or a semi-linear type, and more preferably a semi-linear type, from the viewpoint of mechanical strength and the like.
  • the polyarylene sulfide may contain structural units other than the repeating units represented by the structural formula —Ar—S— (wherein Ar represents an arylene group having 6 to 12 ring carbon atoms).
  • Ar represents an arylene group having 6 to 12 ring carbon atoms.
  • the polyarylene sulfide is prepared by, for example, using a dihalogenated aromatic compound (for example, p-dichlorobenzene) and a sulfur source (for example, sodium sulfide) in an organic polar solvent (for example, N-methylpyrrolidone) and the like (for example, an alkali of a carboxylic acid). It can be produced by reacting in the presence of a metal salt, water or the like.
  • a dihalogenated aromatic compound for example, p-dichlorobenzene
  • a sulfur source for example, sodium sulfide
  • organic polar solvent for example, N-methylpyrrolidone
  • polyarylene sulfide is commercially available, and a commercially available product may be used.
  • the polyarylene sulfide used in the present invention has a melt viscosity at a resin temperature of 300 ° C.
  • melt viscosity is 500 Pa ⁇ s or less, the fluidity at the time of molding is not lowered and the dimensional accuracy of the molded body is not deteriorated, and the optical axis shift of the optical pickup can be suppressed. Further, when the melt viscosity is 5 Pa ⁇ s or more, the mechanical strength is practically preferable.
  • the blending amount of component (B) is 4 to 40% by mass, preferably 4 to 35% by mass, more preferably based on the total amount of component (A) and component (B). Is 10 to 35% by mass, more preferably 20 to 35% by mass, and particularly preferably 20 to 30% by mass. If it exceeds 40% by mass, the mechanical strength and weld strength will be reduced, and the low burr property may be significantly reduced to contaminate the optical system of the optical pickup. If it is less than 4% by mass, the dimensional stability will be increased. The optical axis shift increases and the adhesiveness decreases, and in any case, it is difficult to use the optical pickup.
  • natural graphite can be used without particular limitation.
  • earth graphite and scale graphite may be used, or spheroidized graphite and exfoliated graphite may be used.
  • artificial graphite obtained by molding and firing petroleum coke or the like and further graphitizing at ultra-high temperature. From the viewpoint of production cost, it is preferable to use natural graphite.
  • scaly graphite is preferable from the viewpoint of moldability and heat dissipation of the resin composition.
  • the average particle diameter (50% cumulative diameter) of graphite is not particularly limited, but from the viewpoint of the mechanical strength of the resin composition, it is preferably about 20 to 180 ⁇ m, more preferably 20 to 150 ⁇ m, more preferably 20 to The thickness is 100 ⁇ m, more preferably 20 to 60 ⁇ m, particularly preferably 40 to 60 ⁇ m.
  • the average particle diameter of graphite can be measured by a laser diffraction scattering method according to JIS R1629.
  • the blending amount of the component (C) is 30 to 60 parts by mass, preferably 40 to 60 parts by mass with respect to 100 parts by mass in total of the component (A) and the component (B). More preferably, it is 40 to 50 parts by mass. If it is less than 30 parts by mass, the heat dissipation is not sufficient, and the heat dissipation necessary for maintaining the performance of the optical pickup is insufficient. On the other hand, when it exceeds 60 parts by mass, the moldability is lowered, and the mechanical strength and the weld strength are remarkably lowered.
  • Non-fibrous inorganic fillers include, for example, clay minerals (silicates) such as sericite, kaolin, mica, clay, bentonite, talc, alumina silicate; silicon oxide; alumina, magnesium oxide, zirconium oxide, titanium oxide, iron oxide Metal oxides such as; carbonates of alkaline earth metals such as calcium carbonate, magnesium carbonate, dolomite; sulfates of alkaline earth metals such as calcium sulfate and barium sulfate; glass beads, ceramic beads, boron nitride, silicon carbide, Examples thereof include calcium phosphate and silica.
  • clay minerals such as sericite, kaolin, mica, clay, bentonite, talc, alumina silicate
  • silicon oxide alumina, magnesium oxide, zirconium oxide, titanium oxide, iron oxide
  • Metal oxides such as; carbonates of alkaline earth metals such as calcium carbonate, magnesium carbonate, dolomite; sulfates of
  • the non-fibrous inorganic filler may be pretreated with a silane or titanate coupling agent to increase mechanical strength.
  • a non-fibrous inorganic filler may be used individually by 1 type, and may use 2 or more types together.
  • the content of the component (D) is preferably 20 to 60 masses with respect to a total of 100 parts by mass of the components (A) and (B). Part, more preferably 30 to 50 parts by weight, still more preferably 40 to 50 parts by weight. If it is 20 parts by mass or more, the dimensional stability is good, and if it is 60 parts by mass or less, the moldability is good, and the mechanical strength and the weld strength are good.
  • the resin composition of the present invention may further contain (E) a fibrous inorganic filler in addition to the above components.
  • a fibrous inorganic filler examples include glass fibers, carbon fibers, alumina fibers, silicon carbide fibers, ceramic fibers, asbestos fibers, gypsum fibers, metal fibers, whiskers such as potassium titanate whisker, zinc oxide whisker, and calcium carbonate whisker. And fillers, wollastonite and asbestos.
  • glass fiber is preferable.
  • the fibrous inorganic filler may be pretreated with a silane or titanate coupling agent to increase mechanical strength.
  • the shape of the fibrous inorganic filler examples include a cloth shape, a mat shape, a focused cut (chopped strand) shape, a short fiber, and a filament shape, and a convergent cut shape is preferable.
  • the average fiber diameter is preferably 5 to 20 ⁇ m (more preferably 8 to 15 ⁇ m), and the average fiber length is preferably 1 to 5 mm (more preferably 2 to 4 mm).
  • a fibrous inorganic filler may be used individually by 1 type, and may use 2 or more types together.
  • the content of the component (E) is preferably 15 to 60 masses with respect to a total of 100 parts by mass of the components (A) and (B).
  • Part more preferably 20 to 50 parts by weight, still more preferably 30 to 45 parts by weight. If it is 15 parts by mass or more, the mechanical strength is good and the impact resistance strength when the optical pickup is dropped is good. Moreover, if it is 60 mass parts or less, anisotropy will not arise in a material characteristic and weld strength will become favorable.
  • the resin composition of the present invention is an antioxidant such as hindered phenol, hydroquinone and phosphite, and an ultraviolet absorber such as a heat stabilizer, resorcinol, salicylate, benzotriazole and benzophenone.
  • an antistatic agent such as hindered phenol, hydroquinone and phosphite
  • an ultraviolet absorber such as a heat stabilizer, resorcinol, salicylate, benzotriazole and benzophenone.
  • various additives such as an antistatic agent, a flame retardant, a nucleating agent, and a pigment may be contained.
  • the method for preparing the resin composition of the present invention is not particularly limited.
  • a mixer such as a tumbler mixer or a Henschel mixer, it is preferably 250 to 250 with a single screw extruder or twin screw extruder.
  • the resin composition of the present invention can be obtained by melt-kneading at 380 ° C. (more preferably 280 to 350 ° C.).
  • it can be molded by a normal molding method such as injection molding, extrusion molding, solvent molding, press molding, thermoforming, or the like.
  • the molded body formed by molding the resin composition of the present invention has a breaking load immediately after bonding measured by the method described in the examples of 3 kgf or more, and preferably 3.3 to 3.6 kgf. Excellent in properties. Further, the fracture load after the heat shock test after bonding is 3 kgf or more, and preferably 3.7 to 4.1 kgf, which is excellent in adhesiveness.
  • the thermal conductivity measured by the method described in the examples is 6 W / m ⁇ K or more, approximately 6.2 to 7.8 W / m ⁇ K, and has excellent heat dissipation.
  • the spiral flow length measured by the method described in the examples is 200 to 270 mm, more specifically 230 to 260 mm, and the moldability is excellent.
  • the tensile strength measured by the method described in Examples is 70 MPa or more, approximately 70 to 92 MPa, and is excellent in mechanical strength.
  • the bending strength is 120 MPa or more, and is approximately 123 to 140 MPa, which is excellent in mechanical strength.
  • the Izod impact strength is 5 kJ / m 2 or more, approximately 5.2 to 9.3 kJ / m 2 , and is excellent in impact resistance.
  • the linear expansion coefficient is measured according to the method described in example, MD direction is approximately 0.7 ⁇ 10 -5 /K ⁇ 1.2 ⁇ 10 -5 / K , TD direction roughly 1.0 ⁇ a 10 -5 /K ⁇ 1.7 ⁇ 10 -5 / K, excellent dimensional stability.
  • the molded article for optical pickup of the present invention has a low burr property, and the optical axis deviation measured by the method described in Examples is within 2.5 minutes, and preferably 0.9 to 2.3. Minutes, more preferably 0.9 to 1.6 minutes, and the optical axis deviation is small.
  • the weld strength measured by the method described in the examples is 10 kgf or more, and is approximately 11.8 to 15.3 kgf, and the weld strength is excellent.
  • a flat plate of 80 ⁇ 80 ⁇ 3.2 mm was formed with a 50T injection molding machine manufactured by Nippon Steel Works, and used as a sample.
  • a hole of ⁇ 5 mm was made in the flat plate, and an aluminum plate of 10 ⁇ 10 ⁇ 2 mm was fixed with an adhesive “8813” (manufactured by Kyoritsu Chemical Industry Co., Ltd.) so as to close the hole from one side.
  • Adhesive locations were four corners of the aluminum plate, and 5 mg of the adhesive was used at each location. After the adhesive was cured, the maximum load (unit: kgf) when the aluminum plate was pushed out from the opening side of the hole was measured using a force gauge.
  • Tensile strength Tensile strength was measured according to ASTM D638. (5. Bending strength) The bending strength was measured according to ASTM D790. (6. Izod impact strength) Izod impact strength was measured according to ASTM D256. (7. Dimensional stability (linear expansion coefficient)) The linear expansion coefficient was measured in accordance with ASTM E831, and used as an index of dimensional stability.
  • Optical axis misalignment Use an autocollimator to adjust the tilt of the return light with a reference sample made of quartz glass to 0 minutes, then install a reflect mirror on the optical pickup housing, and fix the main and secondary axes with the shaft. The optical axis inclination of the reflected return light was measured.
  • a cylindrical oven with a diameter of 20 cm, a mechanism that irradiates laser light perpendicularly to the center of the oven, and a laser autocollimator “MTS-2” that measures the reflection angle of the reflected light of the laser (Nissho Electronics Corporation) was measured as follows. First, a half mirror was set at a predetermined position on the optical pickup housing model.
  • the optical pickup housing model was fixed in the oven so that the half mirror surface was horizontal, and the reflection angle was measured by irradiating with laser light at room temperature (23 ° C.). Subsequently, the oven was kept at 80 ° C. for 60 minutes, and then the laser beam was irradiated again to measure the reflection angle.
  • the difference between the reflection angle at 80 ° C. and the reflection angle at room temperature (23 ° C.) was defined as the deviation of the optical axis (unit: minutes).
  • the resolution of the non-contact angle measuring mechanism is 0.02 minutes.
  • the optical axis shift is preferably within 2.5 minutes. (8.3. Weld strength) As shown in FIG.
  • the resin composition of the present invention is excellent in dimensional stability, moldability (particularly thin moldability), mechanical strength, adhesiveness and heat dissipation, and when used as a molded article for an optical pickup, It can be seen that the burrs are low, the optical axis deviation is suppressed, and the weld strength is excellent.
  • the component (B) is not contained (Comparative Example 1), the adhesiveness of the resin composition is lowered, and there is a problem that the optical axis deviation is large when the molded article for optical pickup is used. I understand.
  • the resin composition of the present invention is excellent in dimensional stability, moldability (particularly thin moldability), mechanical strength, adhesiveness and heat dissipation, and a molded body using the resin composition has low burr properties. Since the optical axis deviation is suppressed and the weld strength is excellent, it is useful for optical pickups such as CDs and DVDs.
  • the optical pickup molded body includes a holding container, an optical pickup base, and the like. Especially when the optical pickup base is applied to the optical pickup base, the optical axis even when the optical pickup device using the base is placed at a high temperature exceeding 70 ° C. The effect of suppressing the deviation is remarkable. Therefore, it is useful to use the molded product of the resin composition of the present invention as a large recording capacity and writable optical pickup parts such as CD-R, CD-RW, and DVD-RAM, particularly as an optical pickup base. It is.

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  • Polymers & Plastics (AREA)
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Abstract

Cette invention concerne : une composition de résine ayant une excellente stabilité dimensionnelle, aptitude au moulage (en particulier, aptitude au moulage à paroi mince), résistance mécanique, adhésivité et performance de dissipation thermique ; une composition de résine pour tête de lecture optique ; et un corps moulé pour tête de lecture optique qui est obtenu par moulage de la composition de résine selon l'invention et présente une formation de bavures et un décalage d'axe optique réduits, tout en conservant une excellente robustesse de soudure. La composition de résine selon l'invention est caractérisée en ce qu'elle contient spécifiquement 100 parties en poids d'une composition de résine qui est composée de 60 à 96 % en poids de (A), un polymère liquide et de 40 à 4 % en poids de (B), un polysulfure d'arylène et de 30 à 60 parties en poids de (C), un graphite. La composition de résine peut également contenir 30 à 50 parties en poids de (D), une charge inorganique non fibreuse et de 20 à 50 parties en poids de (E), une charge inorganique fibreuse, si nécessaire.
PCT/JP2012/059404 2011-06-09 2012-04-05 Composition de résine, composition de résine pour tête de lecture optique, et corps moulé pour tête de lecture optique Ceased WO2012169279A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011129317A JP2012255103A (ja) 2011-06-09 2011-06-09 樹脂組成物、光ピックアップ用樹脂組成物及び光ピックアップ用成形体
JP2011-129317 2011-06-09

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JP6381350B2 (ja) * 2014-08-06 2018-08-29 アルパイン株式会社 光ピックアップ装置の製造方法

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JP2002179934A (ja) * 2000-12-07 2002-06-26 Toray Ind Inc 熱可塑性樹脂組成物およびその成形体
JP2003268241A (ja) * 2002-03-13 2003-09-25 Toray Ind Inc 成形品用液晶性樹脂組成物および成形回路基板
JP2004018607A (ja) * 2002-06-14 2004-01-22 Toray Ind Inc 液晶性ポリエステル、その製造方法および熱可塑性樹脂組成物

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
JP2002179934A (ja) * 2000-12-07 2002-06-26 Toray Ind Inc 熱可塑性樹脂組成物およびその成形体
JP2003268241A (ja) * 2002-03-13 2003-09-25 Toray Ind Inc 成形品用液晶性樹脂組成物および成形回路基板
JP2004018607A (ja) * 2002-06-14 2004-01-22 Toray Ind Inc 液晶性ポリエステル、その製造方法および熱可塑性樹脂組成物

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