JP2003301108A - Polyarylene sulfide resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a polyarylene sulfide resin composition that has great excellence in environmental stability in laser focusing and has excellent balance in mechanical strengths, melt fluidity and low burr. <P>SOLUTION: This polyarylene sulfide resin composition is characterized by comprising (a) 100 pts.wt. of a polyarylene sulfide resin, (b) 0.1-5 pts.wt. of at least one compound selected from (b-1) an ester group-containing compound having 20-400 carbon atoms, (b-2) an amide group-containing compound having 20-400 carbon atoms and (b-3) a higher aliphatic carboxylic acid metal salt, (c) 40-200 pts.wt. of a non-fibrous filler and (d) 25-180 pts.wt. of a fibrous filler, provided that the content of the non-fibrous filler (c) is greater than that of the fibrous filler (d). <P>COPYRIGHT: (C)2004,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 has little dimensional change at the time of temperature rise, is excellent in dimensional stability, and is also excellent in mechanical strength, melt flowability and low burr property, and further, Specifically, polyarylene for optical pickup parts, which is used for CD (compact disc), DVD (digital versatile disc or digital video disc), laser disc (registered trademark), magneto-optical disc, etc. and has excellent environmental stability of laser focus. The present invention relates to a sulfide 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.

One of such applications is an optical pickup part. Environmental stability of laser focus in such applications
A special characteristic called "the laser focus is stable due to changes in environmental temperature" is required, and CDs have been used so far.
Polyarylene sulfide resin compositions highly filled with fillers have often been used in applications. However, in the DVD applications which have been popularized recently, more excellent environmental stability of the laser focus is required, and the conventional polyarylene sulfide resin composition may be insufficient in the environmental stability of the laser focus.

A composition obtained by blending a polyarylene sulfide resin with an ester compound consisting of alcohol and a higher aliphatic monocarboxylic acid is disclosed in, for example, JP-A-62-23084.
No. 8 and Japanese Patent Publication No. 5-18353. A composition obtained by blending a polyarylene sulfide resin with an ester compound composed of an organic acid and a higher aliphatic alcohol is disclosed in, for example, Japanese Patent Application Laid-Open No. 4-154866. A composition obtained by blending a polyarylene sulfide resin with an amide compound composed of a higher aliphatic monocarboxylic acid, a polybasic acid and a diamine is disclosed in, for example, JP-A-9-3326. However, none of them describes a composition in which a non-fibrous filler and a fibrous filler are mixed at the same time, and the content of the non-fibrous filler is higher than the content of the fibrous filler, and much less. It is not described at all that the composition gives an excellent composition in balance with environmental stability of the laser focus, mechanical strength, and melt fluidity.

[0005]

In view of such background of the prior art, the present invention is a polyarylene which is remarkably excellent in environmental stability of a laser focus and is excellent in mechanical strength and melt fluidity. It is intended to provide a sulfide resin composition.

[0006]

The present invention employs the following means in order to solve the above problems. (1) (a) Polyarylene sulfide resin 100 parts by weight, (b) (b-1) C20-400 ester group-containing compound, (b-2) C20-400 amide group-containing compound At least one compound selected from (b-3) higher aliphatic carboxylic acid metal salt,
5 parts by weight, (c) non-fibrous filler 40 to 200 parts by weight,
(D) 25 to 180 parts by weight of a fibrous filler, and (c) the content of the non-fibrous filler is higher than that of the (d) fibrous filler. Resin composition. (2) (a) Polyarylene sulfide resin 95-6
Resin mixture 10 consisting of 0 wt% and (e) 5 to 40 wt% of an amorphous thermoplastic resin having a glass transition temperature of 140 ° C or higher.
(B) (b-1) carbon number 20 to 400 relative to 0 parts by weight
Ester group-containing compound of (b-2) carbon number 20 to 40
At least one compound selected from the group consisting of amide group-containing compounds of No. 0 and (b-3) higher aliphatic carboxylic acid metal salts.
1 to 5 parts by weight, (c) non-fibrous filler 40 to 200 parts by weight, (d) fibrous filler 25 to 180 parts by weight, and (c) non-fibrous filler content. (D) A polyarylene sulfide resin composition, characterized in that the content thereof is higher than that of the fibrous filler. (3) The resin according to the above item (2), wherein the amorphous thermoplastic resin having a glass transition temperature of 140 ° C. or higher (e) is at least one selected from polyphenylene ether, polyetherimide, polysulfone, and polyethersulfone. Composition. (4) The polyarylene sulfide resin (a) is a polyarylene sulfide resin having a melt viscosity (310 ° C., a shear rate of 1000 / sec) of 80 Pa · s or less, and the above (1) to (3). Polyarylene sulfide resin composition. (5) The polyarylene sulfide resin composition according to any one of (1) to (4) above, which is for an optical pickup part. (6) An optical pickup component, which is obtained by injection molding the resin composition according to any one of items 1 to 5 above.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Typical examples of the (a) polyarylene sulfide resin used in the present invention include polyphenylene sulfide (hereinafter sometimes abbreviated as PPS), polyphenylene sulfide sulfone, polyphenylene sulfide ketone, and random copolymerization of these. Examples thereof include coalesces, block copolymers, and mixtures thereof. Among them, polyphenylene sulfide is particularly preferably used. Such polyphenylene sulfide is a polymer containing preferably 70 mol% or more, more preferably 90 mol% or more of the repeating unit represented by the following structural formula. When the repeating unit is 70 mol% or more, the heat resistance is It is preferable because it is excellent.

[0008]

[Chemical 1]

Further, such a polyarylene sulfide resin can comprise 30 mol% or less of its repeating unit with a repeating unit having the following structural formula, such as a random copolymer or a block copolymer. It may be present or a mixture thereof.

[0010]

[Chemical 2]

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-52-12240. 61
It can be manufactured by the method of obtaining a polymer having a relatively large molecular weight described in JP-A-7332, or the like.

In the present invention, the polyarylene sulfide resin obtained as described above 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.
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, heat in a heating container until a desired melt viscosity is obtained at a predetermined temperature. 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.
The range 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, A target viscosity level can be obtained. The device for such heat treatment may be an ordinary hot air dryer or a heating device with a rotary or stirring blade, but for efficient and more uniform treatment, a heating device with a rotary or stirring blade. Is more preferably used.

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 is as follows: In an atmosphere of an inert gas such as nitrogen or under a reduced pressure (preferably 7,000 Nm ^-2 or less). Under heat treatment temperature 150-280 ° C., preferably 200
Examples of the method include heat treatment under the conditions of ˜270 ° C. and heating time of 0.5 to 100 hours, preferably 2 to 50 hours. The device for such heat treatment may be an ordinary hot air dryer or a heating device with a rotary or stirring blade, but for efficient and more uniform treatment, a heating device with a rotary or stirring blade. Is more preferably used.

As a specific method for washing the polyarylene sulfide resin with an organic solvent, for example, the organic solvent used for washing is not particularly limited as long as it does not have a function of decomposing the polyarylene sulfide resin. Can be used without. For example, nitrogen-containing polar solvents such as N-methylpyrrolidone, dimethylformamide and dimethylacetamide, sulfoxide / sulfone-based solvents such as dimethyl sulfoxide and dimethyl sulfone,
Acetone, methyl ethyl ketone, diethyl ketone, acetophenone and other ketone solvents, dimethyl ether, dipropyl ether, tetrahydrofuran and other ether solvents, chloroform, methylene chloride, trichloroethylene, dichloroethylene, dichloroethane, tetrachloroethane, chlorobenzene and other halogen solvents Solvent, methanol, ethanol, propanol, butanol, pentanol, ethylene glycol, propylene glycol,
Alcohol / phenolic solvents such as phenol, cresol and polyethylene glycol, and aromatic hydrocarbon solvents such as benzene, toluene and xylene are used. Among these organic solvents, N-methylpyrrolidone, acetone, dimethylformamide, chloroform and the like are preferably used. Further, these organic solvents are used alone or as a mixture of two or more kinds.

As a method of washing with such an organic solvent, there is a method of immersing a polyarylene sulfide resin in an organic solvent, and it is 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. The ratio of the polyarylene sulfide resin and the water is better as much water as possible, 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 is not particularly limited as long as it does not have an action of decomposing the polyarylene sulfide resin, and aliphatic saturated monocarboxylic acid such as formic acid, acetic acid, propionic acid and butyric acid, chloroacetic acid, haloacetic acid such as dichloroacetic acid. Substituted saturated aliphatic carboxylic acids, aliphatic unsaturated monocarboxylic acids such as acrylic acid and crotonic acid, aromatic carboxylic acids such as benzoic acid and salicylic acid, and dicarboxylic acids such as oxalic acid, malonic acid, succinic acid, phthalic acid and fumaric acid. Acids and inorganic acidic compounds such as sulfuric acid, phosphoric acid, hydrochloric acid, carbonic acid and silicic acid are used. Among these acids, especially acetic acid,
Hydrochloric acid is 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 further preferably 20 Pa · s or less under the condition of / sec. Although the lower limit is not particularly limited, it is preferably 5 Pa · s or more. Further, two or more kinds of polyarylene sulfide resins having different melt viscosities may be used together.

When the melt viscosity of the polyarylene sulfide resin exceeds 80 Pa · s, not only the melt fluidity tends to be disadvantageous but also the environmental stability of the laser focus tends to be poor. It is not clear why the environmental stability of the laser focus decreases when the melt viscosity is high, but it probably promotes the orientation of the fibrous filler during molding, which increases the anisotropy of deformation due to temperature change of the molded body. Is estimated. The melt viscosity was measured using a Capillograph (manufactured by Toyo Seiki Co., Ltd.) using a die length of 10 mm and a die hole diameter of 0.
It can be measured under the condition of 5 to 1.0 mm.

Next, (b) (b- used in the present invention
1) an ester group-containing compound having 20 to 400 carbon atoms, (b
-2) an amide group-containing compound having 20 to 400 carbon atoms, (b
-3) The higher aliphatic carboxylic acid metal salt will be described.

(B-1) A preferred embodiment of the ester group-containing compound having 20 to 400 carbon atoms is an ester compound obtained by reacting a monoalcohol and a monocarboxylic acid,
Specific examples include an ester compound obtained by reacting a monocarboxylic acid with a polyhydric alcohol, an ester compound obtained by reacting a monoalcohol with a polybasic acid, and the like.
These can be obtained by a method of reacting a corresponding carboxylic acid or its derivative such as a halide or an anhydride with an alcohol.

The monoalcohol is preferably an aliphatic monoalcohol having 5 or more carbon atoms, and specific examples thereof include pentyl alcohol, hexyl alcohol, heptyl alcohol, octyl alcohol, decyl alcohol, dodecyl alcohol, tetradecyl alcohol and hexadecyl. Examples thereof include alcohol, octadecyl alcohol, docosanol and montan alcohol, and these may be used in combination of two or more kinds. Of these, higher aliphatic monoalcohols having 10 or more carbon atoms are particularly preferably used.

The monocarboxylic acid is preferably an aliphatic monocarboxylic acid having 5 or more carbon atoms and a hydroxycarboxylic acid, and specific examples thereof include valeric acid, caproic acid,
Examples thereof include caprylic acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, behenic acid, montanic acid, 12-hydroxystearic acid, benzoic acid, and the like. May be. Of these, higher aliphatic monocarboxylic acids having 10 or more carbon atoms are particularly preferable.

Specific examples of the polyhydric alcohol include ethylene glycol, propanediol, butanediol,
Examples thereof include hexanediol, oligoethylene glycol, neopentyl glycol, pentaerythritol, polypentaerythritol, trimethylolpropane, and glycerin, and these may be used in combination of two or more.

The polybasic acid is a carboxylic acid having at least a dibasic acid, and specific examples thereof include malonic acid, succinic acid,
Aliphatic dicarboxylic acids such as adipic acid, sebacic acid, pimelic acid and azelaic acid, aromatic dicarboxylic acids such as phthalic acid, terephthalic acid and isophthalic acid, alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid and cyclohexylsuccinic acid And two or more of these may be used in combination.

The (b-1) ester group-containing compound used in the present invention must have 20 to 400 carbon atoms.
It is preferably -200, more preferably 30-100. If the number of carbon atoms is less than 20, the volatility of the ester group-containing compound is too high, which is not preferable because it volatilizes during melt kneading and molding. It is not preferable because the effect of improving the environmental stability becomes insufficient.

Specific examples of the ester group-containing compound having 20 to 400 carbon atoms (b-1) include ethylene glycol dimontanate, pentaerythritol tetramontanate, pentaerythritol tetrastearate, dipentaerythritol hexabehenate, Preferred examples include polypentaerythritol stearate, polypentaerythritol montanate, dibehenyl phthalate, distearyl phthalate, behenyl behenate, trimethylolpropane trimontanate, and trimethylolpropane tristearate. Among them, ethylene glycol diester is preferred. Particularly preferred are montanate, pentaerythritol tetrastearate, and polypentaerythritol stearate.

(B-2) Preferred examples of the amide group-containing compound having 20 to 400 carbon atoms include an amide compound obtained by reacting a monoamine and a monocarboxylic acid, an amide compound obtained by reacting a monocarboxylic acid and a diamine, An amide compound obtained by reacting a monoamine and a polybasic acid,
Examples thereof include an amide compound obtained by reacting a monocarboxylic acid, a polybasic acid, and a diamine. These can be obtained by a dehydration reaction of the corresponding amine and carboxylic acid.

The monoamine is preferably a monoamine having 5 or more carbon atoms, and specific examples thereof include pentylamine, hexylamine, heptylamine, octylamine, nonylamine, decylamine, dodecylamine, stearylamine, cyclohexylamine and benzylamine. Can be exemplified, and these may be used in combination of two or more kinds. Of these, higher aliphatic monoamines having 10 or more carbon atoms are particularly preferable.

The monocarboxylic acid is preferably an aliphatic monocarboxylic acid having 5 or more carbon atoms and a hydroxycarboxylic acid, and specific examples thereof include valeric acid, caproic acid, caprylic acid, lauric acid, myristic acid, palmitic acid and stearin. Acid, oleic acid, linoleic acid, behenic acid, montanic acid, 12-hydroxystearic acid, benzoic acid and the like can be mentioned, and these may be used in combination of two or more kinds. Of these, higher aliphatic monocarboxylic acids having 10 or more carbon atoms are particularly preferable.

Specific examples of the diamine include ethylenediamine, 1,3-diaminopropane, 1,4-diaminopropane, tetramethylenediamine, hexamethylenediamine, nonamethylenediamine, undecamethylenediamine, dodecamethylenediamine, and metaxylyl. Examples include diamine, paraxylylenediamine, tolylenediamine, phenylenediamine, and isophoronediamine, and these may be used in combination of two or more. Among them, ethylenediamine is particularly suitable.

The polybasic acid is a carboxylic acid having at least a dibasic acid, and specific examples thereof include malonic acid, succinic acid,
Aliphatic dicarboxylic acids such as adipic acid, sebacic acid, pimelic acid and azelaic acid, aromatic dicarboxylic acids such as phthalic acid, terephthalic acid and isophthalic acid, alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid and cyclohexylsuccinic acid And two or more of these may be used in combination.

Among them, an amide compound obtained by reacting a higher aliphatic monocarboxylic acid with a polybasic acid and a diamine is particularly preferable, and for example, an amide compound obtained by reacting stearic acid, sebacic acid and ethylenediamine is preferable. In that case, the mixing ratio of each component is preferably in the range of 0.18 mol to 1.0 mol of polybasic acid and 1.0 mol to 2.2 mol of diamine with respect to 2 mol of higher aliphatic monocarboxylic acid. The range of 0.5 mol to 1.0 mol of polybasic acid and 1.5 mol to 2.0 mol of diamine is more preferable.

The amide group-containing compound (b-2) used in the present invention must have 20 to 400 carbon atoms, and has 20 to 20 carbon atoms.
It is preferably 200, more preferably 30 to 100. If the number of carbon atoms is less than 20, the amide group-containing compound has too high volatility, which is not preferable because it volatilizes during melt kneading and molding. It is not preferable because the effect of improving the environmental stability becomes insufficient.

The carbon number when (b-1) and (b-2) are polymers can be determined by, for example, GPC.

(B-3) The higher aliphatic carboxylic acid metal salt is preferably an aliphatic carboxylic acid or hydroxycarboxylic acid having 10 or more carbon atoms, and particularly preferably a higher aliphatic monocarboxylic acid metal salt having 10 or more carbon atoms. .

Specific examples of the higher aliphatic carboxylic acid include lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, behenic acid, montanic acid and 12-hydroxystearic acid. Among them, saturated aliphatic monocarboxylic acids and hydroxycarboxylic acids having 16 or more carbon atoms such as palmitic acid, stearic acid, behenic acid, montanic acid, and 12-hydroxystearic acid are more preferable, and as the metal species, lithium and sodium are preferable. , Potassium, magnesium, calcium, aluminum, zinc, nickel, iron and the like. Among them, calcium stearate, aluminum stearate, lithium stearate and the like are preferably used.

Such (b) (b-1) carbon number 20-40
0 ester group-containing compound, (b-2) carbon number 20 to 4
No. 00 amide group-containing compound and (b-3) higher aliphatic carboxylic acid metal salt, and the compounding amount of at least one compound is (a) polyarylene sulfide resin 10
0.1 to 5 parts by weight, preferably 0.3, relative to 0 parts by weight
A range of up to 3 parts by weight is selected.

The resin component (a) will be described later.
When a resin mixture comprising a polyarylene sulfide resin and (e) an amorphous thermoplastic resin having a glass transition temperature of 140 ° C. or higher is used, (b) and (b-1) the number of carbon atoms relative to 100 parts by weight of the resin mixture. 20-400 ester group-containing compound, (b-2) C20-400 amide group-containing compound, (b-3) higher aliphatic carboxylic acid metal salt,
The compounding amount range of 0.1 to 5 parts by weight of at least one compound selected from is selected, and the range of 0.3 to 3 parts by weight is more preferable.

(B) (b-1) ester group-containing compound having 20 to 400 carbon atoms, (b-2) amide group containing compound having 20 to 400 carbon atoms, (b-3) higher aliphatic carboxylic acid metal salt If the compounding amount of at least one compound selected from the following is less than 0.1 part by weight, the effect of improving the environmental stability of the laser focus is insufficient, and even if added in a range of more than 5 parts by weight, a better laser is obtained. It is not preferable because not only the effect of improving the environmental stability of the focal point cannot be obtained, but also harmful effects such as an increase in the amount of gas generated from the resin composition become apparent.

In the present invention, it is essential to mix (c) the non-fibrous filler. Specific examples of the non-fibrous filler (c) include talc, wollastonite, zeolite, sericite, mica, kaolin, clay, pyrophyllite, bentonite, asbestos, silicates such as alumina silicate, silicon oxide, and oxidation. Metal compounds such as magnesium, alumina, zirconium oxide, titanium oxide and iron oxide, carbonates such as calcium carbonate, magnesium carbonate and dolomite, sulfates such as calcium sulfate and barium sulfate, calcium hydroxide, magnesium hydroxide,
Hydroxides such as aluminum hydroxide, glass beads, glass flakes, glass powder, ceramic beads, boron nitride, silicon carbide, carbon black and silica, graphite, etc. are used, and these may be hollow, and further, these It is also possible to use two or more fillers in combination.
Further, these fillers may be used after being 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. Calcium carbonate,
Particularly preferred are carbonates such as magnesium carbonate and dolomite, sulfates such as calcium sulfate and barium sulfate, silicates such as kaolin, clay and talc, alumina and graphite.

The compounding amount of the non-fibrous filler (c) is
With respect to 100 parts by weight of polyarylene sulfide resin,
A range of 40 to 200 parts by weight is selected, a range of 50 to 150 parts by weight being particularly preferred. As the resin component (a)
When a resin mixture comprising a polyarylene sulfide resin and (e) an amorphous thermoplastic resin having a glass transition temperature of 140 ° C. or higher is used, the range of 40 to 200 parts by weight is selected with respect to 100 parts by weight of the resin mixture. , 50-15
A range of 0 parts by weight is especially preferred. (C) If the amount of the non-fibrous filler compounded is less than 40 parts by weight, sufficient environmental stability of the laser focus cannot be obtained, and if it exceeds 180 parts by weight, the melt fluidity of the resin composition is greatly impaired. It is not preferable because

In the present invention, it is also essential to blend (d) the fibrous filler together with the non-fibrous filler. Specific examples of the (d) fibrous filler include glass fiber, carbon fiber, potassium titanate whiskers, zinc oxide whiskers, calcium carbonate whiskers, wallastonite whiskers, aluminum borate whiskers, aramid fibers, alumina fibers, and silicon carbide. Fiber, ceramic fiber, asbestos fiber, gypsum fiber, metal fiber, etc. are used.
It is also possible to use more than one type. 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 25 with respect to 100 parts by weight of the polyarylene sulfide resin.
The range is from 180 to 180 parts by weight, the range from 40 to 140 parts by weight being particularly preferred. When a resin mixture comprising (a) a polyarylene sulfide resin and (e) an amorphous thermoplastic resin having a glass transition temperature of 140 ° C. or higher is used as a resin component, 100 parts by weight of the resin mixture is used.
A range of 25 to 180 parts by weight is selected, a range of 40 to 140 parts by weight being particularly preferred. (D) If the compounding amount of the fibrous filler is less than 25 parts by weight, sufficient mechanical strength as an optical pickup component cannot be obtained, and if it exceeds 180 parts by weight, the environmental stability of the laser focus deteriorates. Besides, the melt fluidity is also impaired, which is not preferable.

In the present invention, in order to obtain excellent environmental stability of the laser focus, it is important that the content of the non-fibrous filler (c) is higher than the content of the fibrous filler (d). Yes, it is preferably 5 parts by weight or more, more preferably 10 parts by weight or more.

In the present invention, (a) an amorphous thermoplastic resin having a glass transition temperature of 140 ° C. or higher is used as (a) a polyarylene sulfide resin in order to obtain a burr reduction effect and a more excellent environmental stability of a laser focus. Use in combination is also one of the preferable embodiments. The (e) amorphous thermoplastic resin having a glass transition temperature of 140 ° C. or higher may be one that satisfies this condition, and specific examples thereof include a polycarbonate resin, a polyphenylene ether resin, a polysulfone resin, and a polyether. Examples thereof include sulfone-based resins, polyarylate-based resins, polyetherimide-based resins, and polyamide-imide-based resins. Among them, polyphenylene ether-based resins, polyetherimide-based resins, polysulfone-based resins, and polyethersulfone-based resins are particularly suitable. However, a polyphenylene ether resin is particularly preferable.

When (e) the amorphous thermoplastic resin having a glass transition temperature of 140 ° C. or higher is applied, the compounding amount thereof is (a) polyarylene sulfide with respect to the total amount of (a) and (b). 95 to 60% by weight of resin and (e) 5 to 40 of amorphous thermoplastic resin having a glass transition temperature of 140 ° C. or higher
The range of wt% is selected, and the range of (a) 90 to 70 wt% of polyarylene sulfide resin and (e) 10 to 30 wt% of amorphous thermoplastic resin having a glass transition temperature of 140 ° C. or higher are particularly preferable. (E) Glass transition temperature is 140 ° C
If the blending amount of the above amorphous thermoplastic resin is less than 5% by weight, it is insufficient to obtain a low burr effect and more excellent environmental stability of the laser focus. This is not preferable because it significantly impairs sex.

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 cyclic olefin copolymer, nylon 6, nylon 66, nylon 610, nylon 11 and nylon 1.
2. Polyester resin such as polyamide such as aromatic nylon, polyethylene terephthalate, polybutylene terephthalate, polycyclohexyl dimethylene terephthalate, polynaphthalene terephthalate, polyethylene, polypropylene, polytetrafluoroethylene, carboxyl group, carboxylic acid ester group or acid anhydride Examples thereof include olefin-based copolymers having functional groups such as anhydride groups and epoxy groups, polyolefin-based elastomers, polyetherester elastomers, polyetheramide elastomers, polyamideimides, polyacetals and polyimides.

Further, the polyarylene sulfide resin composition of the present invention contains a thioether compound, other ester compounds, plasticizers such as organic phosphorus compounds, talc, kaolin, and the like, as long as the effects of the present invention are not impaired.
Crystal nucleating agents such as organophosphorus compounds, antioxidants such as hindered phenol compounds, hindered amine compounds, heat stabilizers, lubricants, strength improvers such as polyfunctional epoxy compounds, UV inhibitors, colorants, flame retardants and Conventional additives such as 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 mechanical strength, toughness, etc. within a range not impairing 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 preferable 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 used for various moldings such as injection molding, extrusion molding, blow molding and transfer molding, but injection molding is particularly preferably adopted. It

Further, the resin composition of the present invention has excellent environmental stability of laser focus, and is excellent in balance of mechanical strength, melt flowability and low burrability.
It is particularly suitably used for optical pickup parts such as VDs, laser disks, and magneto-optical disks.

Other uses of the 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, and transformers. , Plugs, printed circuit boards, tuners, speakers, microphones, headphones, small motors, magnetic head bases, semiconductors, liquid crystals, FDD carriages, FDD chassis, motor brush holders, parabolic antennas, computer-related parts, etc. ; VTR parts, TV parts, irons, hair dryers, rice cooker parts, microwave oven parts,
Audio parts, audio equipment parts such as audio / laser disk / compact disk, lighting parts, refrigerator parts,
Household and office electrical product parts such as air conditioner parts, typewriter parts, word processor parts, etc .; office computer related parts, telephone related parts, facsimile related parts, copier related parts, cleaning jigs, motor parts, lighters, Machine-related parts typified by typewriters: optical devices typified by microscopes, binoculars, cameras, watches, precision machine-related parts; water faucets, mixed faucets, pump parts, pipe joints, water control valves,
Water circulation parts such as relief valve, hot water temperature sensor, water amount sensor, water meter housing; valve alternator terminal, alternator connector, IC regulator, potentiometer base for light deer, various valves such as exhaust gas valve, fuel related / exhaust system・ Various intake 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, transmission wire harness, Window washer nozzles, air conditioner panel switch boards, fuel-related electromagnetic valve coils, fuse connectors, horn terminals, electrical component insulating plates, step motor rotors, lamp sockets, lamp reflectors, lamp housings, brake pistons, solenoid bobbins, engine oil filters. , Ignition case,
It can be suitably used for automobiles and vehicle-related parts such as vehicle speed sensors and cable liners.

[0057]

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.

[Evaluation of Optical Stability] Sumitomo resin pellets were set at a cylinder temperature of 320 ° C. and a mold temperature of 140 ° C.
Nestal injection molding machine (SG75-HIPRO M
III) and injection-molded under the condition of molding lower limit pressure + 5 kgf / cm ² gauge to obtain an optical pickup model injection-molded product 1 having the shape shown in FIG. Install the half mirror 2 in the central cutout of the optical pickup model injection molded product 1,
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.

FIG. 1 is a perspective view of an injection-molded product in which the half mirror 2 is installed. The half-mirror 2 is installed in the central cutout portion of the injection-molded product 1. 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.

[Measurement of Burr Length] (a) Width 4 mm on circumference
× length 20 mm × thickness 500 μm, (b) width 4 mm × length 20 mm × thickness 20 μm 80 m having two protrusions
Injection molding is performed at a cylinder temperature of 320 ° C and a mold temperature of 130 ° C using a disk-shaped mold of m diameter x 2 mm thickness, and the thickness when the thick protrusion (a) is filled up to the tip ( The burr length was measured by measuring the filling length of the protrusion in b). The gate position was at the center of the disk. For the injection molding, PS20E2ASE manufactured by Nissei Plastic Co., Ltd. was used.

[Measurement of Bending Strength] Measurement was carried out according to ASTM D790. Specifically, the measurement was performed as follows. The resin composition pellets of the present invention were treated at a cylinder temperature of 3
It is supplied to an injection molding machine (SG75-HIPRO MIII) manufactured by Sumitomo-Nestal Co., which is set at 20 ° C and a mold temperature of 140 ° C, and injection molding is performed under the following conditions: injection pressure = molding lower limit pressure + 5 kgf / cm ² gauge pressure. 12.7 mm x height 6.4 mm x
A test piece having a length of 127 mm was obtained. Using this test piece, 2
100 ° C span, 3 ° C, 50% relative humidity
The measurement was performed under the condition that the strain rate was 3 mm / min.

[Measurement of Melt Flowability] Cylinder temperature 32
Using an injection molding machine manufactured by Sumitomo-Nestal, set to 0 ° C and a mold temperature of 140 ° C (SG75-HIPRO MIII)
ASTM No. 1 test piece, width 12.7 mm x height 6.4 mm
× 127 mm long test piece, 12.7 mm wide × thickness 3.
A total of four test pieces of 1 mm × 64 mm in length were taken, and the injection pressure (molding lower limit pressure) required to fill all the pieces was measured and used as a measure of melt fluidity. It can be said that the lower this value, the better the melt fluidity.

[Raw materials used] (a) Polyarylene sulfide resin PPS-1: M2888 (straight type) manufactured by Toray Industries, Inc.,
Melt viscosity 60 Pa · s, PPS-2: M2900 (crosslinked type) manufactured by Toray Industries, Inc.,
Melt viscosity 40 Pa · s PPS-3: M2100 (crosslinked type) manufactured by Toray Industries, Inc.,
Melt viscosity 130 Pa · s The melt viscosity is the Capirograph 1C (Toyo Seiki Co., Ltd.).
It is a value measured using a die manufactured by the same company, a die length of 10 mm, and a hole diameter of 0.5 to 1 mm) under the conditions of 310 ° C. and a shear rate of 1000 / sec.

(B) Additive b-1: ethylene glycol dimontanate ("Licowax E" manufactured by Clariant Co., Ltd., carbon number 58 b-2: 2 mol of stearic acid and 1 mol of sebacic acid were charged in a reactor and heated. After dissolution, 2 mol of ethylenediamine was added, and dehydration reaction was started at 160 ° C in a nitrogen stream,
An amide compound that is reacted at -260 ° C until the amine value becomes 5 or less. Carbon number 38-50 The carbon number was determined by the GPC method. b-3: calcium stearate (Katayama Chemical Co., Ltd.)
B-4: Methyl stearate (manufactured by Katayama Chemical Co., Ltd.), carbon number 19 b-5: Polybutylene terephthalate ("PBT resin 1100S" manufactured by Toray Industries, Inc.), carbon number> 500 b -6: Silicone oil (SH-200, manufactured by Toray Dow Corning Silicone Co., Ltd.).

(C) Non-fibrous filler calcium carbonate: KSS-1000 alumina manufactured by Kinpei Mining Co., Ltd .: average particle diameter 4.0 μm, α crystal grain diameter 3.8 μ
m, average particle size / α crystal particle size = 1.1 (Showa Denko KK)
AL-43PC manufactured by Graphite: KS75 manufactured by Timcal Japan Co., Ltd.

(D) Fibrous filler glass fiber: 03JAFT5 manufactured by Asahi Fiber Glass Co., Ltd.
23.

(E) Amorphous thermoplastic resin having a glass transition temperature of 140 ° C. or higher PPE: polyphenylene ether: YPX-100F
(Mitsubishi Engineering Plastics Co., Ltd., glass transition temperature 205 ° C.) PEI: Polyetherimide: Ultem 1010 (Nippon GE Plastics Co., Ltd., glass transition temperature 217)
℃) PSF: Polysulfone: Udel P-1800 (manufactured by Teijin Amoco Engineering Plastics, glass transition temperature 189 ° C.) PES: Polyethersulfone: Sumika Excel 360
0P (Sumitomo Chemical Co., Ltd., glass transition temperature 230 ° C).

[Examples 1 to 3] A polyphenylene sulfide resin (sometimes abbreviated as PPS), an additive, a non-fibrous filler, and a fibrous filler were dry-blended at a ratio shown in Table 1, and screw type biaxial Using an extruder (Ikegai PCM-30), melt kneading and pelletizing were performed at a cylinder temperature of 320 ° C. and 200 rpm.

Using the pellets, optical axis stability evaluation test pieces and bending strength test pieces were injection-molded, and the molding lower limit pressure and burr length were measured.

[Examples 4 to 8] A polyphenylene sulfide resin, an amorphous resin and additives, a non-fibrous filler and a fibrous filler were dry-blended in the proportions shown in Table 1, and a screw type twin-screw extruder ( Ikegai PCM-30) was used for melt-kneading and pelletizing at a cylinder temperature of 320 ° C. and 200 rpm.

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.

It can be seen that the amount of burrs generated is suppressed and the optical axis fluctuation value is reduced by blending the amorphous resin.

Example 9 Melt kneading, pelletizing and evaluation were carried out in the same manner as in Example 1 except that PPS-3 was used instead of PPS-1 as PPS.

PPS having preferred melt viscosity in the present invention
It can be seen that by using, a composition more excellent in strength, fluidity and optical axis fluctuation can be obtained.

[Examples 10 and 11] As an additive, b-
Example 1 except that b-1 and b-3 were used instead of 2.
Melt-kneading, pelletizing and evaluation were performed in the same manner as in.

[Comparative Examples 1 and 2] Melt kneading, pelletizing and evaluation were carried out in the same manner as in Examples 1 and 3 except that the additive b-2 was not added.

It can be seen that when the component (b) used in the present invention is not added, the optical axis fluctuation value increases and the fluidity also decreases.

[Comparative Examples 3 to 5] Example 1 except that b-4, b-5 and b-6 were used in place of the additive b-2.
Melt-kneading, pelletizing and evaluation were performed in the same manner as in.

It can be seen that the optical axis fluctuation value increases when an additive other than the component (b) used in the present invention is used.

[Comparative Example 6] Except that the amount of the filler was changed,
Melt kneading, pelletizing, and evaluation were performed in the same manner as in Example 1.

It can be seen that when the amount of the fibrous filler exceeds the amount of the non-fibrous filler, the optical axis variation value increases.

[Comparative Examples 7 to 12] Melt kneading, pelletizing and evaluation were performed in the same manner as in Examples 2 and 1 except that the amount of the filler was changed.

It can be seen that if the amount of the filler is too large, the melt viscosity becomes too high to make injection molding difficult, and if the amount of the filler is too small, the optical axis fluctuation value increases and the strength tends to decrease.

[0085]

[Table 1]

[0086]

[Table 2]

[0087]

According to the present invention, there is provided an optical pickup component which is used in a CD (compact disc), a DVD (digital versatile disc), a laser disc, a magneto-optical disc and the like and which is excellent in environmental stability of a laser focus. be able to.

[Brief description of drawings]

FIG. 1 is a perspective view of an injection molded product provided with a half mirror, which is used for optical axis stability evaluation in Examples.

[Explanation of symbols]

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

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C08K 5/20 C08K 5/20 7/02 7/02 F term (reference) 4F071 AA02 AA51 AA60 AA62 AA64 AA86 AA88 AB01 AC09 AC10 AC12 AD01 AE17 AF17 AF29 AF53 AH17 AH19 BA01 BB05 BC03 4J002 CF162 CG002 CH062 CL063 CM042 CN011 CN032 DA019 DA039 DA069 DE079 DE089 DE099 DE109 DE119DE009 E0D05900D05900D059D0H0A019 EP017 FA043 FA049 FA069 FD019 GP00 GS02

Claims (6)

[Claims] 1. (a) Polyarylene sulfide resin 1
(B) (b-1) carbon number 20 to 40 relative to 00 parts by weight
0 ester group-containing compound, (b-2) carbon number 20 to 4
0.1 to 5 parts by weight of at least one compound selected from amide group-containing compounds of No. 00, (b-3) higher aliphatic carboxylic acid metal salts, and (c) non-fibrous fillers 40 to 200.
And 25 to 180 parts by weight of (d) the fibrous filler, and (c) the content of the non-fibrous filler is larger than that of the (d) fibrous filler. Polyarylene sulfide resin composition. 2. (a) Polyarylene sulfide resin 9
5 to 60% by weight and (e) 5 to 40% by weight of the amorphous thermoplastic resin having a glass transition temperature of 140 ° C. or higher to 100 parts by weight of the resin mixture,
400 ester group-containing compound, (b-2) 20 carbon atoms
-400 amide group-containing compound, (b-3) higher aliphatic carboxylic acid metal salt, at least one compound 0.1-5 parts by weight, (c) non-fibrous filler 40-20
0 parts by weight, (d) 25 to 180 parts by weight of the fibrous filler are blended, and the content of the (c) non-fibrous filler is larger than the content of the (d) fibrous filler. A polyarylene sulfide resin composition that does. 3. The resin according to claim 2, wherein (e) the amorphous thermoplastic resin having a glass transition temperature of 140 ° C. or higher is at least one selected from polyphenylene ether, polyetherimide, polysulfone and polyethersulfone. Composition. 4. (a) The polyarylene sulfide resin has a melt viscosity (310 ° C., shear rate 1000 / sec) of 80 Pa.
The polyarylene sulfide resin composition according to any one of claims 1 to 3, which is a polyarylene sulfide resin of s or less. 5. The polyarylene sulfide resin composition according to claim 1, which is for an optical pickup part. 6. An optical pickup part comprising the polyarylene sulfide resin composition according to claim 1 formed by injection molding.