JP2003171551A - Polyarylene sulfide resin composition and application thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyarylene sulfide resin composition which is dramatically excellent in the environmental stability of a laser focusing and is well- balancedly excellent in the mechanical strengths, melt flowability and little burring, and to provide a light pick-up parts using it. <P>SOLUTION: The resin composition comprises 100 pts.wt. of (a) a polyarylene sulfide resin, 1-15 pts.wt. of (b) carbon black which has such a surface carbon atom concentration of 98.0% or more as determined by the X-ray electron spectroscopy, 40-180 pts.wt. of (c) a nonfibrous filler with the exception of (b), and 25-180 pts.wt. of (d) a fibrous filler. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyarylene sulfide resin composition which is remarkably excellent in environmental stability of a laser focus and is excellent in balance of mechanical strength, melt flowability and low burr property. Specifically, it is a poly for optical pickup parts excellent in environmental stability of a laser focus, which is preferably used for a CD (compact disc), a DVD (digital versatile disc or a digital video disc), a laser disc (registered trademark) and a magneto-optical disc. The present invention relates to an arylene sulfide resin resin composition and an optical pickup part obtained by injection molding the same.

[0002]

2. Description of the Related Art Polyarylene sulfide resins have excellent heat resistance, flame retardancy, rigidity, chemical resistance, electrical insulation and moist heat resistance, and therefore have suitable properties as engineering plastics. Mainly used for injection molding, it is widely used for various electric / electronic parts, mechanical parts, automobile parts, etc.

An optical pickup component is mentioned as one of the applications of such polyarylene sulfide resin. In this application, the environmental stability of the laser focus (the laser focus is stable due to changes in the environmental temperature) is called. Special characteristics are required, and in the past, polyarylene sulfide resin compositions highly filled with fillers have often been used especially for CD applications.

However, in the DVD applications which have become widespread these days, a better environmental stability of the laser focus is required. Therefore, the conventional polyarylene sulfide resin composition is insufficient in the environmental stability of the laser focus. The case has arisen.

On the other hand, compositions containing carbon black as a filler in a polyarylene sulfide resin are disclosed in, for example, JP-A-59-100139, JP-A-60-53560, and JP-A-200.
No. 0-230120.

That is, Japanese Patent Laid-Open No. 59-100139 discloses a resin composition containing carbon black having an average particle diameter of 30 nm or less for the purpose of improving the weather resistance of polyphenylene sulfide resin.

Further, JP-A-60-53560 discloses a conductive resin composition comprising a polyarylene sulfide resin and conductive carbon black.

Further, Japanese Unexamined Patent Publication No. 2000-230120 discloses a resin composition in which the amount of burrs is reduced by blending a specific carbon black with a polyarylene sulfide resin.

However, each of the above-mentioned conventional examples is intended to improve weather resistance, electrical conductivity, moldability, and the like. In particular, for improving the environmental stability of the laser focus in the application of optical pickup parts, there is nothing. Not only is it not mentioned, but these conventional examples have a problem that an excellent resin composition cannot be obtained in which the environmental stability of the laser focus, the mechanical strength, the melt flowability and the low burr property are balanced. there were.

[0010]

SUMMARY OF THE INVENTION The present invention has been achieved as a result of studying the solution of the above-mentioned problems in the prior art.

Therefore, an object of the present invention is to provide a polyarylene sulfide resin composition which is remarkably excellent in environmental stability of a laser focus, and is excellent in balance of mechanical strength, melt fluidity and low burr property, and the same. To provide an optical pickup part formed by injection molding.

[0012]

In order to solve the above problems, the polyarylene sulfide resin composition of the present invention comprises (b) carbon black 1 to 15 per 100 parts by weight of (a) polyarylene sulfide resin. Parts by weight,
(C) Non-fibrous fillers 40 to 1 other than carbon black
80 parts by weight and (d) 25 to 180 parts by weight of the fibrous filler, and the surface carbon atom concentration of the carbon black (b) determined by X-ray electron spectroscopy is 98.0.
% Or more.

In the polyarylene sulfide resin composition of the present invention, the melt viscosity (310 ° C., shear rate 100) of the above (a) polyarylene sulfide resin is used.
0 / sec) is 80 Pa · s or less, and the total weight of the non-fibrous fillers other than (b) carbon black and (c) carbon black is greater than the weight of (d) fibrous filler, The (b) carbon black has a pH value of 6 or more, the (b) carbon black has a DBP oil absorption of 300 ml / 100 g or more, and the polyarylene sulfide resin composition is for optical pickup parts. These are all preferable conditions, and by applying these conditions, it is possible to expect to obtain a further excellent effect.

The optical pickup component of the present invention is characterized by being formed by injection molding the above polyarylene sulfide resin composition.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below.

The (a) polyarylene sulfide resin used in the present invention is a polymer containing a repeating unit represented by the following structural formula, preferably 70 mol% or more, more preferably 90 mol% or more. When the repeating unit represented by is less than 70 mol%, the heat resistance tends to be impaired.

[0017]

[Chemical 1] Further, in the polyarylene sulfide resin, 30 mol% or less of the repeating unit can be composed of a repeating unit having the following structural formula.

[0018]

[Chemical 2] Typical examples of these polyarylene sulfide resins include polyphenylene sulfide (hereinafter sometimes abbreviated as PPS), polyphenylene sulfide sulfone,
Examples thereof include polyphenylene sulfide ketone, random copolymers thereof, block copolymers and mixtures thereof, and among them, polyphenylene sulfide is particularly preferably used.

Such a polyarylene sulfide resin can be obtained by a generally known method, that is, a method for obtaining a polymer having a relatively small molecular weight as described in JP-B-45-3368, or JP-B-52-12240 and JP-A-61. −
It can be manufactured by the method of obtaining a polymer having a relatively large molecular weight described in Japanese Patent No. 7332, or the like.

In the present invention, the polyarylene sulfide resin thus obtained is subjected to crosslinking / polymerization by heating in air, heat treatment in an atmosphere of an inert gas such as nitrogen or under reduced pressure, an organic solvent, Washing with hot water, acid aqueous solution, acid anhydride, amine, isocyanate,
Of course, it is also possible to use it after performing various treatments such as activation with a functional group-containing compound such as a functional group-containing disulfide compound.

A specific method for crosslinking / polymerizing the polyarylene sulfide resin by heating is as follows.
Heating in an atmosphere of an oxidizing gas such as air or oxygen or in a mixed gas atmosphere of the oxidizing gas and an inert gas such as nitrogen or argon until a desired melt viscosity is obtained at a predetermined temperature in a heating container. A method of performing it can be illustrated. The heat treatment temperature in this case is preferably 150 to 280 ° C, more preferably 200 to 270 ° C.
Is selected and used, and the treatment time is preferably 0.5 to 100 hours, more preferably 2 to 50 hours. By controlling both of these, the target is set. The viscosity level can be obtained. The apparatus for such heat treatment may be an ordinary hot air dryer or a heating apparatus with a rotary type or stirring blade, but in the case of efficient and more uniform treatment, a rotary type or stirring blade may be used. It is more preferable to use an attached heating device.

As a specific method for heat-treating the polyarylene sulfide resin in an atmosphere of an inert gas such as nitrogen or under a reduced pressure, a heat treatment temperature of 150 to 280 ° C. in an atmosphere of an inert gas such as nitrogen or under a reduced pressure. ,
Preferably 200 to 270 ° C., heating time 0.5 to 100
A method of heat treatment under conditions of time, preferably 2 to 50 hours can be exemplified. The device for such heat treatment is
It may be an ordinary hot-air dryer or a heating device with a rotary blade or a stirring blade, but for efficient and more uniform treatment, a heating device with a rotary blade or stirring blade should be used. Is more preferable.

When the polyarylene sulfide resin is washed with an organic solvent, the organic solvent used for washing is
There is no particular limitation as long as it has no action of decomposing the polyarylene sulfide resin. For example, nitrogen-containing polar solvents such as N-methylpyrrolidone, dimethylformamide and dimethylacetamide,
Sulfoxide / sulfone solvents such as dimethyl sulfoxide and dimethyl sulfone, ketone solvents such as acetone, methyl ethyl ketone, diethyl ketone and acetophenone, ether solvents such as dimethyl ether, dipropyl ether and tetrahydrofuran, chloroform, methylene chloride, trichloroethylene, ethylene dichloride. , Halogen-based solvents such as dichloroethane, tetrachloroethane, chlorobenzene, methanol, ethanol, propanol, butanol, pentanol, ethylene glycol, propylene glycol, phenol, cresol,
Alcohol / phenolic solvents such as polyethylene glycol and aromatic hydrocarbon solvents such as benzene, toluene and xylene are used. Among these organic solvents, especially N-methylpyrrolidone, acetone,
Dimethylformamide and chloroform are preferably used. Further, these organic solvents are used alone or as a mixture of two or more kinds.

As a specific method of washing with the organic solvent, there is a method of immersing the polyarylene sulfide resin in the organic solvent, and it is also possible to appropriately stir or heat if necessary. The washing temperature when washing the polyarylene sulfide resin with an organic solvent is not particularly limited, and any temperature from room temperature to 300 ° C can be selected. Although the cleaning efficiency tends to increase as the cleaning temperature increases, a sufficient effect is usually obtained at a cleaning temperature of room temperature to 150 ° C. The polyarylene sulfide resin that has been washed with an organic solvent is preferably washed with water or warm water several times in order to remove the remaining organic solvent.

The following method can be exemplified as a specific method for treating the polyarylene sulfide resin with hot water. That is, the water to be used is preferably distilled water or deionized water in order to exert the preferable effect of chemically modifying the polyarylene sulfide resin by washing with hot water. The operation of the hot water treatment is usually performed by charging a predetermined amount of water with a predetermined amount of polyarylene sulfide resin and heating and stirring the mixture at normal pressure or in a pressure vessel. As for the ratio of the polyarylene sulfide resin and the water, the more the water is, the better, and preferably 200 g of the polyarylene sulfide resin per 1 liter of water.
Used in the following bath ratios:

The following method can be exemplified as a specific method for treating the polyarylene sulfide resin with an acid. That is, there is a method of immersing the polyarylene sulfide resin in an acid or an aqueous solution of the acid, and it is also possible to appropriately stir or heat it as necessary. The acid used in this case is not particularly limited as long as it has no action to decompose the polyarylene sulfide resin, formic acid, acetic acid, propionic acid, aliphatic saturated monocarboxylic acid such as butyric acid, chloroacetic acid, dichloro Halo-substituted aliphatic saturated carboxylic acids such as acetic acid, aliphatic unsaturated monocarboxylic acids such as acrylic acid and crotonic acid, aromatic carboxylic acids such as benzoic acid and salicylic acid, oxalic acid, malonic acid, succinic acid, phthalic acid, fumaric acid Dicarboxylic acids such as acids and inorganic acidic compounds such as sulfuric acid, phosphoric acid, hydrochloric acid, carbonic acid and silicic acid are used. Among these acids, acetic acid and hydrochloric acid are more preferably used. The acid-treated polyarylene sulfide resin is preferably washed with water or warm water several times in order to remove residual acid or salt. The water used for washing is preferably distilled water or deionized water in the sense that the effect of preferable chemical modification of the polyarylene sulfide resin by acid treatment is not impaired.

The polyarylene sulfide resin used in the present invention has a melt viscosity of 310 ° C. and a shear rate of 1000.
It is preferably 80 Pa · s or less, more preferably 50 Pa · s or less, and 5 to 20 Pa · s under the condition of / sec.
s is more preferable. Further, two or more kinds of polyarylene sulfide resins having different melt viscosities may be used together.

If the melt viscosity of the polyarylene sulfide resin exceeds the above range, it is not only disadvantageous in terms of melt fluidity but also environmentally stable in laser focus. Although it is not clear why the environmental stability of the laser focus decreases when the melt viscosity is high, it is likely that the orientation of the fibrous filler during molding will be promoted and the anisotropy of deformation due to temperature change of the molded body will increase. It is estimated to be because.

Next, the carbon black (b) used in the present invention has an essential requirement that the surface carbon atom concentration determined by X-ray electron spectroscopy is 98.0% or more.
It is more preferably 9.0% or more. This means that the carbon black has few impurities.

When (b) carbon black containing a large amount of impurities such as oxygen, nitrogen and sulfur is used, sufficiently excellent characteristics are not exhibited in terms of environmental stability of the laser focus. Although the reason for this is not clear, it is presumed that a large amount of impurities on the surface of carbon black may be one of the reasons why the interaction between the interface of (a) polyarylene sulfide resin and (b) carbon black is obstructed. There is.

The surface carbon atom concentration measured by X-ray electron spectroscopy was measured by using an ESCALAB220iXL apparatus (manufactured by VG Scientific Co.) and the excited X-ray was mon.
ochromaticAlKα1,2 ray (1486.6
eV), X-ray diameter 1 mm, X-ray output 10 kV, 20 mA, and the value measured under the condition of a photoelectron escape angle of 90 ° (detection depth: 10 nm).

The carbon black (b) used in the present invention is preferably a carbon black having a pH value of 6 or more from the viewpoint of obtaining more excellent environmental stability of the laser focus. Although the reason for this is not clear, the pH value of carbon black depends on the surface functional group, and the carbon black surface functional group that expresses a high pH value shows some interaction with (a) the polyarylene sulfide resin. It is estimated that this is one of the reasons.

The method for measuring the pH value of carbon black is as follows. That is, about 5 g of a carbon black sample was boiled in 150 cc of distilled water for 5 minutes, allowed to stand, cooled to room temperature, and then centrifuged for 3 minutes (2,000 RPM) in a centrifuge to remove the supernatant. The sludge is separated and used as a measurement sample. The sludge is placed in a beaker and measured with a pH meter.

Further, the carbon black (b) used in the present invention is DB from the viewpoint of obtaining a more excellent burr reducing effect.
P oil absorption (measured based on ASTM-D2424-79)
Is preferably 300 ml / 100 g or more of carbon black, and particularly preferably 400 to 700 ml / 100 g. Although it is not clear why the occurrence of burrs is suppressed when the DBP oil absorption is high, (b) carbon black having a high DBP oil absorption has a higher adsorption property of (a) polyarylene sulfide resin. It is presumed that this is partly because the melt flow behavior is controlled by.

The average particle size of the primary particles of the carbon black (b) is not particularly limited, but in order to obtain excellent environmental stability of the laser focus, the average particle size of the primary particles is usually 10 to 100 nm, It is preferably used in the range of 20 to 80 nm.

The carbon black (b) may have a chain structure in which primary particles are connected to each other. The average particle diameter of the primary particles is measured by using an electron microscope, usually several hundred to several thousand particles, as described in Filler Handbook (published by Taisei Co., Ltd., first edition published in 1985, p. 42). Can be determined by counting method by measuring individual size. The shape of the carbon black is not particularly limited, and it is a light powder as it is produced, a pressed product obtained by compressing a powdered product to increase its specific gravity, and a powdered product with a radius of 0.3 to 1.5 mm. It may be any of the granulated products. The method for producing carbon black is not particularly limited, but it can usually be obtained by incomplete combustion or thermal decomposition of natural gas or liquid hydrocarbon.

The carbon black used in the present invention is available from the market, and commercially available products of (b) carbon black preferably used in the present invention include # HS500 manufactured by Asahi Carbon Co., Ltd. and manufactured by Denki Kagaku Kogyo Co., Ltd. Denka Black (FX-35) and the like can be exemplified, and among them, # HS500 manufactured by Asahi Carbon Co., Ltd. is particularly preferably used.

The amount of carbon black (b) added in the present invention is 1 to 100 parts by weight of the PPS resin.
A range of 15 parts by weight is selected, a range of 2 to 10 parts by weight is more preferable, and a range of 3 to 10 parts by weight is particularly preferable.

(B) If the amount of carbon black added is too small, sufficient environmental stability of the laser focus cannot be obtained.
On the other hand, if the amount is too large, not only the better environmental stability of the laser focus cannot be obtained, but also the melt-kneading property of the resin composition is impaired and the mechanical strength is lowered, which is not preferable.

In the present invention, it is an essential requirement to blend (c) a non-fibrous filler other than carbon black together with (b) carbon black. Specific examples of the (c) non-fibrous filler other than carbon black include:
Silicates such as talc, wollastonite, zeolite, sericite, mica, kaolin, clay, pyrophyllite, bentonite, asbestos, alumina silicate,
Metal compounds such as silicon oxide, magnesium oxide, alumina, zirconium oxide, titanium oxide and iron oxide, carbonates such as calcium carbonate, magnesium carbonate and dolomite,
Calcium sulfate, sulfates such as barium sulfate, calcium hydroxide, magnesium hydroxide, hydroxides such as aluminum hydroxide, glass beads, ceramic beads, boron nitride, silicon carbide, carbon black and silica, graphite and the like. These may be hollow, and it is also possible to use two or more kinds of these fillers in combination. Further, these non-fibrous fillers may be pretreated with a coupling agent such as an isocyanate compound, an organic silane compound, an organic titanate compound, an organic borane compound and an epoxy compound before use. Of these, carbonates such as calcium carbonate, magnesium carbonate and dolomite, sulfates such as calcium sulfate and barium sulfate, and silicates such as kaolin, clay and talc are particularly preferable.

The blending amount of the non-fibrous filler other than (c) carbon black is preferably in the range of 40 to 180 parts by weight, and particularly in the range of 50 to 150 parts by weight, based on 100 parts by weight of the polyarylene sulfide resin. preferable.
(C) If the compounding amount of the non-fibrous filler other than carbon black is less than the above range, sufficient environmental stability of the laser focus cannot be obtained, and if it exceeds the above range, melt flow of the resin composition This is not preferable because the property is greatly impaired.

In the present invention, it is also an essential requirement to blend (d) the fibrous filler together with (b) carbon black and (c) the non-fibrous filler. Specific examples of the (d) fibrous filler include glass fiber, carbon fiber, potassium titanate whisker, zinc oxide whisker, aluminum borate whisker, aramid fiber, alumina fiber, silicon carbide fiber, ceramic fiber, asbestos fiber, stone fiber. Examples thereof include fibers and metal fibers, and these can be used in combination of two or more kinds. In addition, pre-treatment of these fillers with a coupling agent such as an isocyanate compound, an organic silane compound, an organic titanate compound, an organic borane compound and an epoxy compound gives a better mechanical strength. Preferred in meaning. Among them, glass fiber and carbon fiber are more preferably used.

The compounding amount of the (d) fibrous filler is 2 with respect to 100 parts by weight of the polyarylene sulfide resin.
The range of 5 to 180 parts by weight is preferable, and the range of 50 to 150 parts by weight is particularly preferable. (D) If the blending amount of the fibrous filler is less than the above range, sufficient mechanical strength as an optical pickup component cannot be obtained, and if the blending amount exceeds the above range, the environmental stability of the laser focus is deteriorated. In addition, the melt fluidity is also impaired, which is not preferable.

In the present invention, it is more preferable that the total weight of (b) carbon black and (c) non-fibrous filler other than carbon black is larger than that of (d) fibrous filler. This is a preferable condition for obtaining environmental stability of the laser focus.

The polyarylene sulfide resin composition of the present invention may be blended with other resins as long as the effects of the present invention are not impaired. The blendable resin is not particularly limited, but specific examples thereof include polysulfone, polyphenylene oxide, polycarbonate, polyether sulfone, polyetherimide, cyclic olefin copolymer, nylon 6, nylon 66, nylon 610, nylon 11, Nylon 12,
Polyamide resin such as aromatic polyamide such as nylon, polyethylene terephthalate, polybutylene terephthalate, polycyclohexyl dimethylene terephthalate, polynaphthalene terephthalate, polyethylene,
Polypropylene, polytetrafluoroethylene, olefin-based copolymers having functional groups such as carboxyl groups, carboxylic acid ester groups, acid anhydride anhydride groups and epoxy groups, polyolefin-based elastomers, polyetherester elastomers, polyetheramide elastomers,
Examples thereof include polyamide imide, polyacetal and polyimide.

The polyarylene sulfide resin composition of the present invention contains a thioether compound, an ester compound, a plasticizer such as an organic phosphorus compound, talc, kaolin, and an organic phosphorus compound as long as the effects of the present invention are not impaired. Crystal nucleating agents such as, polyolefin-based compounds, silicone-based compounds, long-chain aliphatic ester-based compounds, releasing agents such as long-chain aliphatic amide-based compounds, hindered phenol-based compounds, antioxidants such as hindered amine-based compounds, Conventional additives such as heat stabilizers, lubricants such as calcium stearate, aluminum stearate and lithium stearate, UV inhibitors, colorants, flame retardants and foaming agents can be added.

Further, the polyarylene sulfide resin composition of the present invention contains an epoxy group, an amino group, an isocyanate group, a hydroxyl group, for the purpose of improving the mechanical strength and toughness of the polyarylene sulfide resin composition within the range that does not impair the effects of the present invention. An alkoxysilane having at least one functional group selected from a mercapto group and an ureido group may be added.
Specific examples of such compounds include epoxy group-containing alkoxysilanes such as γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, and β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane. Compounds, γ-mercaptopropyltrimethoxysilane, mercapto group-containing alkoxysilane compounds such as γ-mercaptopropyltriethoxysilane, γ-ureidopropyltriethoxysilane, γ-ureidopropyltrimethoxysilane, γ- (2-ureidoethyl) ) Ureido group-containing alkoxysilane compounds such as aminopropyltrimethoxysilane, γ-isocyanatopropyltriethoxysilane, γ-isocyanatopropyltrimethoxysilane, γ-isocyanatopropylmethyldimethoxysilane, Isocyanato group-containing alkoxysilane compounds such as γ-isocyanatopropylmethyldiethoxysilane, γ-isocyanatopropylethyldimethoxysilane, γ-isocyanatopropylethyldiethoxysilane, γ-isocyanatopropyltrichlorosilane, γ- (2- Amino group-containing alkoxysilane compounds such as aminoethyl) aminopropylmethyldimethoxysilane, γ- (2-aminoethyl) aminopropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, and γ-hydroxypropyltrimethoxysilane, γ- Examples thereof include a hydroxyl group-containing alkoxysilane compound such as hydroxypropyltriethoxysilane.

The suitable addition amount of such a silane compound is 0.1% with respect to 100 parts by weight of the polyphenylene sulfide resin.
A range of 05 to 5 parts by weight is selected.

The method for preparing the polyphenylene sulfide resin composition of the present invention is not particularly limited, but the mixture of the raw materials is put into a commonly known melt mixer such as a single-screw or twin-screw extruder, a Banbury mixer, a kneader and a mixing roll. As a typical example, a method of supplying and kneading at a temperature of 280 to 380 ° C. can be mentioned. The order of mixing the raw materials is not particularly limited, and a method in which all raw materials are melt-kneaded by the above method after mixing, a part of the raw materials are melt-kneaded by the above method, and the remaining raw materials are further mixed and melt-kneaded Or a method of mixing some of the raw materials and then mixing the remaining raw materials with a side feeder during melt-kneading with a single-screw or twin-screw extruder. As for the small amount additive component, it is of course possible to knead the other components by the above-mentioned method or the like to form pellets, and then add the components before molding to provide molding.

The polyarylene sulfide resin composition of the present invention thus obtained can be subjected to various moldings such as injection molding, extrusion molding, blow molding and transfer molding, but injection molding is particularly preferably adopted. It

Since the polyarylene sulfide resin composition of the present invention has little dimensional change at the time of temperature rise and is excellent in dimensional stability, it has excellent environmental stability of laser focus and mechanical strength, The melt flowability and the low burr property are also excellent in balance, and it is particularly suitably used as an optical pickup component application for CDs, DVDs, laser disks, and magneto-optical disks.

Further, other uses of the polyarylene sulfide resin composition of the present invention include, for example, sensors,
LED lamps, connectors, sockets, resistors, relay cases, switches, coil bobbins, capacitors, variable capacitor cases, oscillators, various terminal boards, transformers, plugs, printed circuit boards, tuners, speakers, microphones, headphones, small motors, magnetic heads base,
Electric / electronic parts such as semiconductors, liquid crystals, FDD carriages, FDD chassis, motor brush holders, parabolic antennas, computer-related parts; V
TR parts, TV parts, irons, hair dryers,
Rice cooker parts, microwave oven parts, audio parts, audio
Household and office electrical product parts such as laser disk / compact disk audio equipment parts, lighting parts, refrigerator parts, air conditioner parts, typewriter parts, word processor parts, etc .; office computer related parts, telephone related parts, facsimile related parts Parts, copier-related parts, cleaning jigs, motor parts, lighters, typewriters, and other machine-related parts: microscopes, binoculars, cameras, clocks, and other optical instruments, precision machine-related parts; water faucets Tops, mixed faucets, pump parts, pipe joints, water flow control valves, relief valves, hot water temperature sensors, water flow sensors, water meter housings, and other water-related parts; valve alternator terminals, alternator connectors, IC regulators, light deer ports. Tensiometer Various valves such as base, exhaust gas valve, fuel-related / exhaust system / intake system various pipes, air intake nozzle snorkel, intake manifold, fuel pump, engine cooling water joint, carburetor main body, carburetor spacer, exhaust gas sensor, cooling water sensor , Oil temperature sensor, Throttle position sensor, Crankshaft position sensor, Air flow meter, Brake pad wear sensor, Air conditioner thermostat base, Heating hot air flow control valve, Radiator motor brush holder, Water pump impeller, Turbine vane, Wiper motor Related parts, detributor, starter switch, starter relay, wire harness for transmission, Wind washer nozzle, air conditioner panel switch substrate, fuel-related electromagnetic valve coil, fuse connector, horn terminal, electrical component insulating plate, step motor rotor, lamp socket, lamp reflector, lamp housing, brake piston, solenoid bobbin, engine oil Examples include automobiles and vehicle-related parts such as a filter, an ignition device case, a vehicle speed sensor, and a cable liner, which can be suitably used for these applications.

[0053]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the description of these examples.

The evaluation of various characteristics in the following examples was carried out by the following methods. [Measurement of Bending Strength] Measurement was performed according to ASTM D790. Specifically, the measurement was performed as follows. An injection molding machine (SG75-HIP) manufactured by Sumitomo-Nestal Co., Ltd., in which the resin composition pellets of the present invention are set to a cylinder temperature of 330 ° C.
RO ・ MIII) and injection pressure = molding lower limit pressure + 5
Injection molding was performed at a Kgf / cm ² gauge pressure to obtain a width of 12.
A test piece of 7 mm × height 6.4 mm × length 127 mm was obtained. Using this test piece, measurement was performed in an atmosphere of 23 ° C. and relative humidity of 50% under conditions of a span of 100 mm and a strain rate of 3 mm / min. [Measurement of melt flowability (molding lower limit pressure)] Cylinder temperature 3
Using the Sumitomo-Nestal injection molding machine set at 30 ° C. (SG75-HIPRO MIII) ASTM No. 1 test piece, width 12.7 mm × height 6.4 mm × length 127 mm
Test piece, width 12.7 mm × thickness 3.1 mm × length 64
A total of four test pieces each having two mm test pieces were molded, and the injection pressure required to fill all of them (lower molding lower limit pressure) was measured and used as a measure of melt fluidity. It can be said that the lower this value is, the more excellent the melt fluidity is. [Measurement of burr length] Around the circumference (a) Width 4 mm x length 20 m
m × depth 500 μm, (b) width 4 mm × length 20 mm × depth 10 μm, 80 mmφ × 2 mm
Injection molding was performed using a disk-shaped mold of t, and the filling length of the protrusion of (b) when the protrusion of (a) was just filled was measured. [Optical Axis Stability Evaluation] FIG. 1 is a perspective view of an injection-molded product in which the half mirror 2 is installed. The laser light emitted from the semiconductor laser autocollimator is incident on the surface of the half mirror 2 at a right angle and is reflected.

A half mirror 2 is installed in the central cutout of an optical pickup model injection molded product 1 having the shape shown in FIG.
A laser beam oscillated from a semiconductor laser autocollimator having a focal length of 200 mm, a wavelength of 650 nm and an output of 0.3 mW was irradiated in a constant temperature bath, and the reflected laser beam was received by a CCD camera.

Using the position of the reflected laser light at 30 ° C. as the origin, the temperature was raised to 70 ° C. over 30 minutes, and the optical axis fluctuation value after standing for 30 minutes was measured. It can be said that the smaller this value, the better the environmental stability of the laser focus. [Materials used] Polyphenylene sulfide PPS-1: Linear polyphenylene sulfide resin, melt viscosity 18 Pa · s, ash content 0.19 wt% PPS-2: Linear polyphenylene sulfide resin, melt viscosity 60 Pa · s, ash content 0.08 wt % PPS-3: Linear polyphenylene sulfide resin Melt viscosity 100 Pa · s, ash content 0.06 wt% Carbon black b-1: Asahi Carbon Co., Ltd. # HS500, surface carbon atom concentration 99.4%, average Particle size 38 nm, DBP oil supply amount 500 ml / 100 g, pH = 6 to 8 b-2: Denka Black (DENKA BLACK (FX-3)
5), surface carbon atom concentration 99.9%, average particle diameter 23n
m, acetylene black, DBP oil absorption: 22
0 ml / 100 g), pH = 9 to 10 b-3: Tokai Carbon Co., Ltd. # 8300, surface carbon atom concentration 97.8%, average particle diameter 16 nm, DBP oil supply amount 80 ml / 100 g, pH = 5 b- 4: MOGUL-L manufactured by Cabot Corporation, surface carbon atom concentration 94.2%, average particle diameter 24 nm, DBP oil supply amount 6
0 ml / 100 g, pH = 2.5-Calcium carbonate: KSS-1000 manufactured by Konpei Mining Co., Ltd.-Kaolin: ASP-200 manufactured by Hayashi Kasei Co., Ltd.-Glass fiber: 03JAFT manufactured by Asahi Fiber Glass Co., Ltd.
523 [Examples 1 to 6] Polyphenylene sulfide resin (PP
S), carbon black, non-fibrous filler (calcium carbonate or kaolin), fibrous filler (glass fiber)
Were dry-blended in the proportions shown in Table 1, and melt-kneaded and pelletized using a screw type twin-screw extruder (Ikegai PCM-30).

Using this pellet, an optical axis stability evaluation test piece and a bending strength test piece were injection-molded, and the molding lower limit pressure and the burr length were measured.

The results are shown in Table 1.

[0059]

[Table 1] [Comparative Examples 1 and 2] Melt kneading, pelletizing and evaluation were carried out in the same manner as in Example 1 except that b-3 or b-4 was used as the carbon black instead of b-1.

The results are shown in Table 2.

From the results shown in Table 2, it can be seen that the use of carbon black having a low surface carbon atom concentration tends to increase the fluctuation of the optical axis. [Comparative Example 3] Melt kneading, pelletizing and evaluation were performed in the same manner as in Example 1 except that the amount of carbon black was reduced.

The results are also shown in Table 2.

From the results shown in Table 2, it can be seen that if the carbon black is reduced too much, the optical axis fluctuation tends to increase and the burr tends to increase. Comparative Example 4 Melt kneading, pelletizing, and evaluation were performed in the same manner as in Example 4 except that the amount of carbon black was increased.

The results are also shown in Table 2.

From the results in Table 2, it can be seen that even if the carbon black content is increased too much, the optical axis fluctuations increase, the burrs increase, and the strength tends to decrease. Comparative Example 5 Melt kneading, pelletizing, and evaluation were performed in the same manner as in Example 1 except that the amount of fibrous filler (glass fiber) was reduced and the amount of calcium carbonate was increased.

The results are also shown in Table 2.

From the results shown in Table 2, it can be seen that the bending strength in which the amount of the fibrous filler (glass fiber) is excessively reduced is remarkably lowered. [Comparative Example 6] Melt kneading, pelletizing and evaluation were carried out in the same manner as in Example 4 except that the amount of the fibrous filler (glass fiber) was increased and the amount of calcium carbonate was decreased.

The results are also shown in Table 2.

From the results shown in Table 2, it can be seen that if the amount of the fibrous filler (glass fiber) is increased too much, the viscosity increases remarkably, and the optical axis fluctuation and the amount of burrs tend to increase. [Comparative Example 7] Melt kneading, pelletizing and evaluation were performed in the same manner as in Example 1 except that the amount of the non-fibrous filler (calcium carbonate) was reduced and the amount of glass fiber was increased.

The results are also shown in Table 2.

From the results in Table 2, it can be seen that if the amount of the non-fibrous filler (calcium carbonate) is reduced too much, the burr tends to increase and the optical axis fluctuation also increases. [Comparative Example 8] Melt kneading, pelletizing and evaluation were performed in the same manner as in Example 4 except that the amount of the non-fibrous filler (calcium carbonate) was increased and the amount of the glass fiber was decreased.

The results are also shown in Table 2.

From the results shown in Table 2, it can be seen that if the amount of the non-fibrous filler (calcium carbonate) is increased too much, the viscosity increases remarkably, the burrs tend to increase, and the optical axis fluctuation increases.

[0074]

[Table 2]

[0075]

Industrial Applicability As described above, the polyarylene sulfide resin composition of the present invention has little dimensional change at the time of temperature rise and is excellent in dimensional stability. Excellent and mechanical strength,
It has a characteristic that is unprecedented in that the melt fluidity and the low flash property are balanced and excellent.

Therefore, the optical pickup part obtained by injection molding the polyarylene sulfide resin composition of the present invention is excellent in environmental stability of laser focus,
(Compact disc), DVD (digital versatile disc), laser disc, magneto-optical disc and the like can be preferably used.

[Brief description of drawings]

FIG. 1 is a perspective view of an injection-molded article in which a half mirror used for evaluation of optical axis stability in an example is installed.

[Explanation of symbols]

1 Injection molded product 2 Half mirror a Incident direction of laser light oscillated from semiconductor laser autocollimator b Reflection direction of reflected laser light

Continued front page    F term (reference) 4J002 CL062 CN011 DA01 DA026                       DA038 DA067 DE076 DE086                       DE096 DE107 DE116 DE136                       DE146 DE147 DE187 DE236                       DG046 DG056 DJ006 DJ016                       DJ026 DJ027 DJ036 DJ046                       DJ056 DK006 DK007 DL006                       DL007 DM006 DM007 FA042                       FA047 FA067 FA086 GM00                       GP00 GQ00                 5D119 AA32 AA36 BA01 BB01 BB05                       MA03 NA03                 5D789 AA32 AA36 BA01 BB01 BB05                       MA03 NA03

Claims (7)

[Claims] 1. (b) 1 to 15 carbon black per (a) 100 parts by weight of polyarylene sulfide resin.
Parts by weight, (c) 40 to 180 parts by weight of non-fibrous filler other than carbon black, and (d) fibrous filler 25 to
A polyarylene sulfide resin composition comprising 180 parts by weight, wherein the carbon black (b) has a surface carbon atom concentration determined by X-ray electron spectroscopy of 98.0% or more. 2. The polyarylene sulfide resin composition according to claim 1, wherein the melt viscosity (310 ° C., shear rate 1000 / sec) of the (a) polyarylene sulfide resin is 80 Pa · s or less. 3. The total weight of the non-fibrous filler other than (b) carbon black and (c) carbon black is
The polyarylene sulfide resin composition according to claim 1 or 2, characterized in that it is more than the weight of the (d) fibrous filler. 4. The polyarylene sulfide resin composition according to claim 1, wherein the carbon black (b) has a pH value of 6 or more. 5. The polyarylene sulfide resin composition according to any one of claims 1 to 4, wherein the carbon black (b) has a DBP oil absorption of 300 ml / 100 g or more. 6. The polyarylene sulfide resin composition according to claim 1, wherein the polyarylene sulfide resin composition is for an optical pickup part. 7. An optical pickup part comprising the resin composition according to claim 1 formed by injection molding.