JP2007106970A - Resin composition for optical part and optical part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a resin composition for an optical part which has an extremely small optical axis deviation and excellent mechanical strength, moldability (low mold corrosiveness and smell) and an optical part. <P>SOLUTION: The resin composition for an optical part is obtained by mixing 100 parts by mass of a polyarylene sulfide with 150-450 parts by mass of calcium carbonate, 100-400 parts by mass of glass fiber and 0.02-10 parts by mass at least one kind selected from a basic metal silicate which is obtained by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water and is represented by general formula (1) MO-nSiO<SB>2</SB>and a basic metal silicate which is obtained by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water and represented by general formula (2) sM<SP>1</SP>O-tM<SP>2</SP>O-mSiO<SB>2</SB>. The optical part is obtained by injection molding the resin composition. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a resin composition for optical parts and an optical part.

  Conventionally, optical components such as optical pickups such as CDs and DVDs, optical housings (bases) such as high-speed color copiers and high-speed color laser beam printers (LBPs) have been manufactured by metal die casting such as aluminum and zinc. It was. However, in recent years, with the increasing needs for product cost reduction and weight reduction, these resinizations have begun to be considered and gradually replaced. At this time, depending on the function of each optical component, the resin material has dimensional accuracy and dimensional stability during (injection) molding, moldability (fluidity), mechanical strength, rigidity, and environmental resistance (heat, humidity) , Chemicals, etc.) and flame retardant properties are required. In resin-made optical parts, among these characteristics, it has become particularly remarkable in recent years to reduce the dimensional stability, particularly the optical axis shift of the optical system with respect to changes in the environment (temperature, humidity, etc.). However, there has been a strict demand for high recording density and high speed processing of CDs, DVDs, etc., or high speed colorization of copying machines, LBPs, etc.

Optical axis characteristics have been improved by improving the dimensional stability of the material by adding a filler composition and polyphenyl ether (PPE; high Tg amorphous resin). However, the actual optical component molded product has a complicated structure, and the optical axis characteristics may be deteriorated due to a non-uniform surface state around the optical component installation portion or a weld.
On the other hand, mold corrosion and odor generation were also problems.

Japanese Unexamined Patent Publication No. 64-40888 Japanese Patent Laid-Open No. 57-119494

  In view of the above circumstances, the present invention provides a resin composition for an optical component that gives an optical component that has an extremely small optical axis shift and that is excellent in mechanical strength and moldability (low mold corrosion and odor), and an optical component comprising the same. The purpose is to provide.

As a result of intensive studies, the inventor added a specific amount of a basic metal silicate having a specific structure produced by a specific production method to 100 parts by mass of polyarylene sulfide, thereby obtaining a mold. It has been found that a resin composition for optical parts having little corrosiveness and odor and excellent moldability can be obtained.
Furthermore, the present inventor provides an optical component that provides an optical component with extremely small optical axis deviation and excellent mechanical strength by adding a specific amount of a specific resin, calcium carbonate, and filler to the resin composition for optical components. The present inventors have found that a resin composition for parts can be obtained and completed the present invention.

That is, this invention can provide the following resin composition for optical components, and an optical component consisting thereof.
1. [1] For 100 parts by mass of polyarylene sulfide,
[2] 150 to 450 parts by mass of calcium carbonate,
[3] 100 to 400 parts by mass of glass fiber, and [4] a basic metal silicate salt produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water, having a general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.30. ]
And a basic metal silicate produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water, wherein the general formula (2)
sM ¹ O · tM ² O · mSiO ₂ (2)
Wherein (2), ^{M 1} is Ca, ^{M 2} represents a Mg, a s + t = 1, m has a value ranging from 0.02 to 0.30. ]
The resin composition for optical components formed by adding 0.02-10 mass parts of at least 1 type selected from the group which consists of basic silicate metal salt shown by these.
2. Furthermore, 30 to 250 of at least one resin selected from the group consisting of [5] syndiotactic polystyrene (SPS) -based resin, polystyrene-based resin, and polyphenylene oxide-based resin is used per 100 parts by mass of [1] polyarylene sulfide. 2. The resin composition for optical parts as described in 1 above, which is added by mass parts.
3. 3. The resin composition for optical parts as described in 1 or 2 above, wherein the polyarylene sulfide is polyphenylene sulfide.
4). 4. An optical component obtained by injection molding the resin composition for optical components according to any one of 1 to 3 above.
5. 4. An optical pickup housing obtained by injection molding the resin composition for optical components according to any one of 1 to 3 above.

  According to the present invention, there are provided a resin composition for an optical component that gives an optical component having an extremely small optical axis deviation and excellent mechanical strength and moldability (low mold corrosion and odor), and an optical component comprising the same. Can do.

  Hereinafter, the resin composition for optical components of the present invention and the optical component comprising the same will be described in detail.

1. Optical Component Resin Composition The optical component resin composition of the present invention is [1] polyarylene sulfide 100 parts by mass, [2] 150 to 450 parts by mass of calcium carbonate, and [3] 100 to 400 glass fibers. [4] at least one selected from the group consisting of [4] the basic metal silicate represented by the general formula (1) and the basic metal silicate represented by the general formula (2), It is characterized by adding 0.02 to 10 parts by mass.
Hereinafter, the polyarylene sulfide, calcium carbonate, glass fiber and the basic metal silicate represented by the general formula (1) or (2) used in the present invention will be described in detail.

[1] Polyarylene sulfide The polyarylene sulfide used in the present invention has a repeating unit represented by the general formula (3)
-(Ar-S)-(3)
[In the formula (3), Ar represents an arylene group, and S represents sulfur. ]
It is a polymer shown by. When the repeating unit (Ar-S) is defined as 1 mol (basic mol), the polyarylene sulfide used in the present invention has this repeating unit of usually 50 mol% or more, preferably 70 mol% or more, more preferably 90 mol%. A polymer containing at least mol%.

  As the arylene group, p-phenylene, m-phenylene, o-phenylene, alkyl-substituted phenylene (preferably an alkyl group having 1 to 6 carbon atoms), phenyl-substituted phenylene, halogen-substituted phenylene, amino-substituted phenylene, amide-substituted phenylene Divalent aromatic residues containing at least one benzene ring such as p, p'-diphenylenesulfone, p, p'-biphenylene, p, p'-biphenylene ether, p, p'-biphenylenecarbonyl and naphthalene Can be mentioned. Examples of the polyarylene sulfide composed of these arylene groups include a homopolymer composed of the same repeating unit, a copolymer composed of two or more different arylene groups, and a mixture thereof.

  Among these polyarylene sulfides, polyphenylene sulfide having p-phenylene sulfide as the main constituent element of the repeating unit is particularly preferable because of its excellent processability and industrial availability. In addition, polyarylene ketone sulfide, polyarylene ketone ketone sulfide, and the like can be used. Specific examples of the copolymer include a random or block copolymer having a repeating unit of p-phenylene sulfide and a repeating unit of m-phenylene sulfide, a random or block copolymer having a repeating unit of phenylene sulfide and a repeating unit of arylene ketone sulfide, and phenylene sulfide. And a random or block copolymer having a repeating unit of arylene ketone ketone sulfide and a random or block copolymer having a repeating unit of phenylene sulfide and a repeating unit of arylene sulfone sulfide. These polyarylene sulfides are preferably crystalline polymers.

  Polyarylene sulfide can be obtained by a known method in which an alkali metal sulfide and a dihalogen-substituted aromatic compound are subjected to a polymerization reaction in a polar solvent. Examples of the alkali metal sulfide include lithium sulfide, sodium sulfide, potassium sulfide, rubidium sulfide, cesium sulfide and the like. Sodium sulfide produced by reacting sodium hydrosulfide and sodium hydroxide in the reaction system can also be used. Examples of the dihalogen-substituted aromatic compound include p-dichlorobenzene, m-dichlorobenzene, 2,5-dichlorotoluene, p-dibromobenzene, 2,6-dichloronaphthalene, 1-methoxy-2,5-dichlorobenzene, 4,4'-dichlorobiphenyl, 3,5-dichlorobenzoic acid, p, p'-dichlorodiphenyl ether, 4,4'-dichlorophenyl sulfone, 4,4'-dichlorodiphenyl sulfoxide, 4,4'-dichlorodiphenyl ketone, etc. Can be mentioned. These can be used alone or in combination of two or more.

  In order to introduce some branched structure or crosslinked structure into the polyarylene sulfide, a polyhalogen-substituted aromatic compound having 3 to 6 halogen substituents per molecule can be used in combination. Examples of the polyhalogen-substituted aromatic compound include 1,2,3-trichlorobenzene, 1,2,3-tribromobenzene, 1,2,4-trichlorobenzene, 1,2,4-tribromobenzene, 1 , 3,5-trichlorobenzene, 1,3,5-tribromobenzene, 1,3-dichloro-5-bromobenzene and the like, and alkyl substituted products thereof. These can be used alone or in combination of two or more. Among these, 1,2,4-trichlorobenzene, 1,3,5-trichlorobenzene, and 1,2,3-trichlorobenzene are preferable from the viewpoints of economy, reactivity, physical properties, and the like.

  Examples of the polar solvent include aromatic organic amide solvents such as N-alkylpyrrolidone such as N-methyl-2-pyrrolidone, 1,3-dialkyl-2-imidazolidinone, tetraalkylurea, hexaalkylphosphoric triamide and the like. The reaction system is highly stable, and a high molecular weight polymer is easily obtained. In the present invention, in addition to the substantially linear polyarylene sulfide, polyarylene sulfide subjected to various washing operations and heat treatment after polymerization can also be used.

[2] Calcium carbonate In the resin composition for an optical component of the present invention, 150 to 450 parts by mass of calcium carbonate is preferably added as a filler to 100 parts by mass of polyarylene sulfide, and 150 to 300 parts by mass. It is more preferable to add part.
Dimensional stability is obtained by adding calcium carbonate.
If the added amount of calcium carbonate is less than 150 parts by mass, the above effect is not exhibited, and if it exceeds 450 parts by mass, the fluidity is lowered, which is not preferable.

  There is no limitation in particular in the calcium carbonate which can be used by this invention, What was obtained by what kind of manufacturing method may be used. Examples of commercially available products of calcium carbonate include Shiraishi Kogyo Co .; Whiten P30.

[3] Glass fiber In the resin composition for optical components of the present invention, it is preferable to add 100 to 400 parts by mass of glass fiber as a filler with respect to 100 parts by mass of polyarylene sulfide, and 150 to 300 parts by mass. It is more preferable to add part.
By adding glass fiber, an effect of improving the strength can be obtained.
If the addition amount of the glass fiber is less than 100 parts by mass, the above effect is not exhibited, and if it exceeds 400 parts by mass, the fluidity is lowered, which is not preferable.

  As a glass fiber which can be used by this invention, Asahi Fiber Glass Co., Ltd .; JAFT591 is mentioned, for example.

[4] Basic Silicic Acid Metal Salt The basic silicic acid metal salt represented by the following general formula (1) used in the present invention (hereinafter sometimes referred to as basic silicic acid metal salt (1)) is hydroxylated. Manufactured by heating calcium or magnesium hydroxide and amorphous silicic acid in water.
MO.nSiO ₂ (1)
[In Formula (1), M represents Ca or Mg, and n is a value in the range of 0.02 to 0.30. ]
The basic metal silicate represented by the general formula (1) is basic calcium silicate or basic magnesium silicate.

The basic silicate metal salt represented by the following general formula (2) used in the present invention (hereinafter sometimes referred to as basic silicate metal salt (2)) is calcium hydroxide and magnesium hydroxide and is amorphous. Manufactured by heating silicic acid in water.
sM ¹ O · tM ² O · mSiO ₂ (2)
Wherein (2), ^{M 1} is Ca, ^{M 2} represents a Mg, a s + t = 1, m has a value ranging from 0.02 to 0.30. ]
The basic metal silicate represented by the general formula (2) is basic calcium magnesium silicate.

  These basic metal silicates represented by the general formula (1) and the general formula (2) can be used in combination of two or more kinds, but basic calcium silicate and basic magnesium silicate alone Compared to the use, it is preferred to use a basic metal silicate salt containing both calcium and magnesium metals. Examples of such include the combined use of basic calcium silicate and basic magnesium silicate represented by general formula (1), the use of basic calcium magnesium silicate represented by general formula (2), and The basic calcium magnesium silicate represented by the general formula (2) and the basic calcium silicate or basic magnesium silicate represented by the general formula (1) can be used in combination.

  In the case of the basic metal silicate represented by the general formula (2), the molar ratio of calcium / magnesium, that is, s / t is preferably in the range of 5/95 to 95/5. The basic calcium magnesium silicate represented by the general formula (2) has a calcium / magnesium hydroxide molar ratio of 5/95 to 95/5, and calcium hydroxide and magnesium hydroxide. Is obtained by reacting amorphous silicic acid in the range of 0.02 to 0.30 mol with respect to 1 mol in total.

In general formula (1) and general formula (2), n and m represent the molar ratio of SiO ₂ / MO and SiO ₂ / (M ¹ O + M ² O), and values in the range of 0.02 to 0.30. N and m are preferably in the range of 0.02 to 0.15. When n and m are less than 0.02 or more than 0.30, the physical properties deteriorate or the optical axis characteristics become unstable, such as deterioration of characteristics, mold corrosion, odor Problems such as occurrence of molding may occur, which is not preferable.

  The basic metal silicate (1) used in the present invention is 1 mol of calcium hydroxide or magnesium hydroxide, and the basic metal silicate (2) is a total of calcium hydroxide and magnesium hydroxide. 0.02 to 0.30 mol, preferably 0.02 to 0.15 mol of amorphous silicic acid is mixed in water with respect to 1 mol, and this mixture is reacted at a temperature of 50 to 100 ° C. The resulting slurry can be easily produced by evaporating to dryness.

  As the calcium hydroxide used as a raw material, any of the special Nos. 1, 2 and 2 of industrial lime (JIS R 9001) can be used. It is not limited to this, The thing for other uses, for example, slaked lime for plasterers, can also be used. As the magnesium hydroxide, natural or synthetic magnesium hydroxide can be used.

As amorphous silicic acid, use white carbon, other wet method amorphous silica (precipitation method silica or gel method silica), and amorphous silica obtained by acid treatment of smectite group viscosity mineral. Can do. This amorphous silica generally has a BET specific surface area of 150 to 400 m ² / g and a secondary particle size in the range of 1 to 10 μm.

The basic metal silicates (1) and (2) used in the present invention may contain water or hydrated water (water existing as a hydroxyl group). When hydration water is included, MO (M is Ca or Mg) in the general formula ( ¹ ) or M ¹ O (M ¹ is Ca) or M ² O (M ² is Mg in the general formula (2)) ) Exists partially as hydroxide. Thus, even when water or hydration water is contained, the basic metal silicate used in the present invention has a composition of the general formula (1) or the general formula (2).

The following are mentioned as a specific manufacturing method of each basic silicate metal salt.
1. In order to obtain basic calcium silicate, calcium hydroxide and white carbon are used, and amorphous silicic acid is in the range of 0.02 to 0.30, preferably 0.02 to 0.000, per mol of calcium hydroxide. In the range of 15, the reaction is carried out in water at a reaction temperature of 50-100 ° C, preferably 80-98 ° C.
2. In order to obtain basic magnesium silicate, magnesium hydroxide and white carbon are used, and amorphous silicic acid is in the range of 0.02 to 0.30, preferably 0.02 to 0.000 per mol of magnesium hydroxide. In the range of 15, the reaction is carried out in water at a reaction temperature of 50-100 ° C, preferably 80-98 ° C.
3. In order to obtain basic calcium magnesium silicate, calcium hydroxide and magnesium hydroxide and white carbon are used. Amorphous silicic acid 0.02 to 0.30 with respect to 1 mol in total of calcium hydroxide and magnesium hydroxide, The reaction is preferably carried out in water at 0.02 to 0.15 and at a reaction temperature of 50 to 100 ° C, preferably 80 to 98 ° C.

A metal silicate obtained by a method other than this method, for example, a method of reacting a water-soluble silicate and a water-soluble metal salt in the presence of water as described in JP-A No. 5-18689, Even if SiO ₂ / MO in formula (1) or SiO ₂ / (M ¹ O + M ² O) in formula (2) is more than 0.30 in molar ratio, Even a basic silicate in the range of 0.02 to 0.30 is not preferable because it causes a decrease in properties such as a decrease in strength and a decrease in optical axis characteristics.

  Moreover, even if a simple mixture of calcium hydroxide or calcium oxide or magnesium hydroxide or magnesium oxide and silicic acid so as to have the composition of the above general formula (1) or general formula (2) is added, the strength decreases. This is not preferable because it causes deterioration of characteristics such as optical axis characteristics. Furthermore, a metal silicate outside the scope of the present invention is simply mixed with calcium hydroxide or calcium oxide or magnesium hydroxide and magnesium oxide so as to have the composition of the above general formula (1) or general formula (2). Even if added, the resin properties such as the strength and optical axis properties are reduced, which is not preferable.

  The basic silicic acid metal salts (1) and (2) used in the present invention are higher fatty acid, higher fatty acid ammonium salt, higher fatty acid alkali metal salt such as alkali metal salt such as stearic acid and oleic acid, organic sulfonic acid And may be surface-treated with an organic sulfonic acid alkali metal salt such as an alkali metal salt such as dodecylbenzenesulfonic acid. The surface-treated basic metal silicates (1) and (2) used in the present invention are excellent in mechanical strength because the dispersibility of the compound is improved as compared with the compound not subjected to surface treatment. A molded product is obtained.

In the present invention, the amount of the basic metal silicate (1) or (2) added to the polyarylene sulfide is in the range of 0.02 to 10 parts by mass, preferably 0.00. 1 to 5 parts by mass. In addition, when using together basic silicate metal salt (1) and (2), the total amount is the range of 0.02-10 mass parts with respect to 100 mass parts of this resin, Preferably it is 0.1. -5 parts by mass.
When the addition amount is less than 0.02 parts by mass, the metal corrosion resistance is insufficient, and when it exceeds 10 parts by mass, the amount of optical axis deviation increases and the strength decreases.

[5] One or more resins selected from the group consisting of syndiotactic polystyrene (SPS) -based resins, polystyrene (PS) -based resins, and polyphenylene oxide (PPO) -based resins. In addition, it is preferable to add 30 to 250 parts by mass of one or more resins selected from the group consisting of syndiotactic polystyrene (SPS) resin, polystyrene resin, and polyphenylene oxide resin with respect to 100 parts by mass of polyarylene sulfide. It is more preferable to add 50 to 100 parts by mass.
By adding these resin components, effects such as stabilization of the optical axis, reduction of burrs, and improvement of adhesiveness can be obtained.
If the addition amount of these resin components is less than 30 parts by mass, the above effect is not sufficient, and if it exceeds 250 parts by mass, the moldability is lowered, which is not preferable.

Examples of syndiotactic polystyrene (SPS) resins that can be used in the present invention include Zarek manufactured by Idemitsu Kosan.
Examples of the polystyrene-based resin that can be used in the present invention include GPPS (general PS) such as HH102 manufactured by PS Japan.
Examples of the polyphenylene oxide resin that can be used in the present invention include GE-modified PPO640-111.

  The polyarylene sulfide composition of the present invention may be used by blending another resin in addition to the resin of the above [5] as long as the effects of the present invention are not impaired. The resin that can be blended is not particularly limited, and specific examples thereof include nylon 6, nylon 66, nylon 610, nylon 11, nylon 12, and polyamides such as aromatic nylon, polyethylene terephthalate, polybutylene terephthalate, and polycyclohexyl. Polyester resins such as dimethylene terephthalate and polynaphthalene terephthalate, polysulfone, polycarbonate, polyethersulfone, polyetherimide, cyclic olefin copolymer, polyethylene, polypropylene, polytetrafluoroethylene, carboxyl group, carboxylic acid ester group, acid anhydride group or Olefin copolymers having functional groups such as epoxy groups, polyolefin elastomers, polyether ester elastomers, polyether amides Elastomer, polyamide-imide, polyacetal, and polyimide.

  In the resin composition for optical parts of the present invention, a filler other than the above calcium carbonate and glass fiber can be blended and used for the purpose of expressing more excellent strength and dimensional stability. Specific examples of the filler include fibrous fillings such as carbon fiber, potassium titanate whisker, zinc oxide whisker, aluminum borate whisker, aramid fiber, alumina fiber, silicon carbide fiber, ceramic fiber, asbestos fiber, stone koji fiber, and metal fiber. Agents, plate fillers such as glass flakes and mica, wollastonite, zeolite, sericite, talc, kaolin, clay, pyrophyllite, bentonite, asbestos and alumina silicates such as alumina silicate, silicon oxide, magnesium oxide, alumina, Metal compounds such as zirconium oxide, titanium oxide and iron oxide, carbonates such as magnesium carbonate, sulfates such as calcium sulfate and barium sulfate, hydroxides such as calcium hydroxide, magnesium hydroxide and aluminum hydroxide, glass beads, Ceramic beads, boron nitride, Of silicon, graphite, non-fibrous fillers such as carbon black and silica and the like, which may be hollow, and further, it is also possible to use these fillers 2 or more. In addition, using these fillers by pretreatment 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 can provide better mechanical strength. Preferred in meaning.

  Furthermore, in the present invention, in addition to the basic silicate metal salts (1) and (2), various additives such as a lubricant, an antistatic agent, an antioxidant, an ultraviolet absorber, a release agent and a coloring agent are added. It can be added in combination.

  Since the resin composition for optical parts of the present invention has little metal corrosivity, it does not corrode the mold used for resin molding, and therefore has excellent moldability. Moreover, it has the characteristic that there are few preferable odors in manufacture of an industrial product.

2. Optical component The optical component of the present invention is formed by injection molding the above resin composition for optical components of the present invention.
The optical component of the present invention is particularly useful as an optical pickup housing because of excellent moldability, high mechanical strength, and extremely small optical axis misalignment. An optical pickup housing is an optical component that serves as a base for an optical disk reader, and requires precise formability and high heat-resistant dimensional stability.

  The optical component of the present invention has excellent performance as a product such as an LBP optical box and a camera lens barrel in addition to the optical pickup housing.

  The injection molding method for obtaining the optical component of the present invention is not particularly limited, and any known method can be used.

EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto. In these examples, “part” means “part by mass”.
(Synthesis Example 1)
Calcium hydroxide [Ryoko Lime Kogyo Co., Ltd. special name fine powder, content: CaO conversion 74% by mass] 75.8 g (1 mol) and amorphous silicic acid [Shionogi Pharmaceutical Co., Ltd. Carplex # 80, content ; 95 mass% in terms of SiO ₂ ] 1.27 g (0.02 mol) was suspended in 400 ml of ion-exchanged water and reacted at 95 ° C. for 4 hours. The slurry was transferred to a stainless steel vat, dried at 110 ° C. and pulverized by a sample mill to obtain basic calcium silicate (CaO · 0.02SiO ₂ ).

(Synthesis Examples 2 to 10)
Using the following raw materials, a basic metal silicate was synthesized under the same conditions as in Synthesis Example 1 while changing the molar ratio of calcium hydroxide, magnesium hydroxide and amorphous silicic acid.
Raw material used: Calcium hydroxide [Ryoko Lime Industry Co., Ltd., special name fine powder, content: CaO conversion 74% by mass]
Magnesium hydroxide [Kamishima Chemical Co., Ltd. # 200, content: 66% by mass in terms of MgO]
-Amorphous silicic acid [Carplex # 80, manufactured by Shionogi Pharmaceutical Co., Ltd., content: 95% by mass in terms of SiO ₂ ]
The results are shown in Table 1.

(Synthesis Example 11)
Calcium hydroxide [Special powder of Ryoko Lime Industry Co., Ltd., content; CaO conversion 74% by mass] 9.1 g (0.12 mol), Magnesium hydroxide [Kamijima Chemical Co., Ltd. # 200, content; MgO 66 mass% in terms of conversion] 53.7 g (0.88 mol) and amorphous silicic acid [Carplex # 80, manufactured by Shionogi Pharmaceutical Co., Ltd .; content: 95 mass% in terms of SiO ₂ ] 1.27 g (0.02 mol) Was suspended in 400 ml of ion-exchanged water and reacted at 95 ° C. for 4 hours. The slurry was transferred to a stainless steel vat, dried at 110 ° C. and pulverized with a sample mill to obtain basic calcium magnesium silicate (0.12CaO · 0.88MgO · 0.02SiO ₂ ).

(Synthesis Examples 12 to 20)
Using the following raw materials, a basic metal silicate was synthesized under the same conditions as in Synthesis Example 11 while changing the molar ratio of calcium hydroxide, magnesium hydroxide and amorphous silicic acid.
Raw material used: Calcium hydroxide [Ryoko Lime Industry Co., Ltd., special name fine powder, content: CaO conversion 74% by mass]
Magnesium hydroxide [Kamishima Chemical Co., Ltd. # 200, content: 66% by mass in terms of MgO]
-Amorphous silicic acid [Carplex # 80, manufactured by Shionogi Pharmaceutical Co., Ltd., content: 95% by mass in terms of SiO ₂ ]
The results are shown in Table 2.

(Synthesis Example 21)
Calcium hydroxide [Special powder of Ryokko Lime Industry Co., Ltd., content: 74% by mass in terms of CaO] 37.8 g (0.5 mol), Magnesium hydroxide [Kamijima Chemical Co., Ltd. # 200, content; MgO Convert 66 wt%] 30.4 g (0.5 mol) and the amorphous silicic acid [Shionogi & Co., Ltd. Carplex # 80, content; SiO ₂ in terms of 95 mass%] 7.6 g (0.12 mol) Was suspended in 400 ml of ion-exchanged water and reacted at 95 ° C. for 4 hours. Thereafter, 1.5 g of ammonium stearate was added, and the reaction was further continued at the same temperature for 30 minutes to complete the surface treatment. The slurry was transferred to a stainless steel vat, dried at 110 ° C., ground in a sample mill, and surface-treated with ammonium stearate (0.50CaO · 0.50MgO · 0.12SiO _2). )

(Synthesis Example 22)
Solution A was prepared by dissolving 147.0 g (1 mol) of calcium chloride dihydrate in 100 ml of ion-exchanged water. No. 1 sodium silicate [content: 36.4% by mass in terms of SiO _2, 17.2% by mass in terms of Na ₂ O] 19.8 g (SiO ₂ ; 0.12 mol, Na ₂ O; 055 mol) and 75.6 g (1.89 mol) of sodium hydroxide were dissolved to prepare solution B. Both A and B liquids were mixed, and after reacting the mixed slurry at 40 ° C. for 2 hours, the slurry was filtered and washed with water. After drying at 110 ° C., the mixture was pulverized with a sample mill to obtain basic calcium silicate (CaO · 0.12SiO ₂ ).

(Synthesis Examples 23-25)
Using the following raw materials, basic metal silicates were synthesized under the same conditions as in Synthesis Example 22 while changing the molar ratio of calcium chloride, magnesium chloride, sodium silicate and sodium hydroxide.
Raw materials used: calcium chloride dihydrate, magnesium chloride hexahydrate, No. 1 sodium silicate [content: 36.4% by weight in terms of SiO _2, 17.2% by weight in terms of Na ₂ O]
The results are shown in Table 3.

(Synthesis Example 26)
A solution A in which 100.0 g of No. 3 sodium silicate (SiO ₂ = 0.488 mol) was dissolved in 125.4 ml of ion-exchanged water was prepared. Liquid B was prepared by dissolving 37.92 g (0.152 mol) of copper sulfate pentahydrate and 0.8 g (0.02 mol) of sodium hydroxide in 31.35 ml of ion-exchanged water. The respective aqueous solutions were supplied to the overflow type reaction layer at a rate of 2.67 ml / minute for liquid A and 0.67 ml / minute for liquid B, and reacted with stirring. The temperature of the reaction solution slurry was kept at 40 ° C. The pH was 7.2. The slurry product after the reaction was filtered, washed with water until no sulfate ions were detected in the washing solution, and the obtained washing cake was dried at 100 ° C. to obtain copper silicate.

  Next, the basic silicate metal salts (hereinafter referred to as Group A) used in the present invention are summarized in Table 4, and the other silicate metal salt compounds (hereinafter referred to as Group B) are summarized in Table 5, respectively. .

(Synthesis Example 27)
Synthesis of polyphenylene sulfide A 15 L autoclave was charged with 5 L of N-methyl-2-pyrrolidone, heated to 120 ° C., then charged with 1866 g of Na ₂ S · 2.8H ₂ O, and gradually raised to 205 ° C. with stirring. Warm and distill off 407 g of water. After cooling the system to 140 ° C., 2080 g of p-dichlorobenzene was added. The temperature was raised to 225 ° C. and polymerized for 2 hours, then the temperature was raised to 250 ° C., and polymerization was further performed at 250 ° C. for 2 hours. After completion of the polymerization, the slurry cooled to room temperature is poured into a large amount of water to precipitate the polymer, filtered, repeatedly washed with pure water, and then heated and vacuum dried overnight to obtain a single polymer. Released. The melt viscosity of the obtained polyphenylene sulfide was 20 PaS. The polyphenylene sulfide thus obtained was further heat-cured at 235 ° C. in an air atmosphere to obtain a melt viscosity of 60 PaS.

[Evaluation Examples 1 to 34 and Comparative Evaluation Examples 1 to 30]
To 100 parts of the polyphenylene sulfide produced in Synthesis Example 27, the silicate metal salt compound shown in Table 6 was added in the proportion shown in Table 6, and the blended mixture was melt-kneaded using an extruder and pelletized. Got.
The obtained pellets were evaluated for metal corrosion resistance, mold contamination resistance and odor. The results are shown in Table 6.

(Metal corrosion resistance)
4 g of the obtained pellets and a nail were put into a test tube, put in a heating block set at 340 ° C., heated for 18 hours, and then taken out from the test tube. The nail deposits were removed, and the state of occurrence of rust on the nail after standing in a desiccator with a humidity of 80% for 3 days was visually determined. The state of occurrence of rust on the nail was determined according to the following criteria.
1: No rust is generated on the nail.
2: Some rust is slightly generated on the nail.
3: Less than 30% of rust is generated on the nail.
4: Rust is generated on the nail less than about 50%.
5: About 50% or more of rust is generated on the nail.
6: Rust is generated on the entire surface of the nail.

(Metal mold resistance)
4 g of the obtained pellet and the nail were put into a test tube, put in a heating block set at 340 ° C., heated for 18 hours, and the amount of deposits generated on the nail was visually determined. The amount of deposits generated on the nail was determined according to the following criteria.
a: No deposits are generated on the nail.
b: Slight deposits are generated on the nail.
c: Many deposits are generated on the nail.
d: Very many deposits are generated on the nail.

(Odor)
4 g of the obtained pellet was put into a test tube, put into a heating block set at 340 ° C., heated for 10 minutes, and then the odor in the test tube was judged by the following criteria by a sensory test of five panelists.
○: Only a slight odor can be felt.
Δ: Odor is somewhat uncomfortable.
×: Strong odor and unpleasant.

Example 1
(1) Production of resin composition for optical component 100 parts by mass of polyphenylene sulfide obtained in Synthesis Example 27, 0.025 part by mass of basic metal silicate (A-13) obtained in Synthesis Example 16 and polyphenylene oxide [Product made by GE; product name 640-111] 50 parts by mass, calcium carbonate [Shiraishi Kogyo Co., Ltd .; Whiten P30] 200 parts by mass, and glass fiber [Asahi Fiber Glass Co., Ltd .; JAFT591] 150 parts by mass were mixed, After dry blending, the mixture was melt-kneaded at 320 ° C. using a twin screw extruder (manufactured by Toshiba Machine Co., Ltd .; TEM35) to obtain pellets of the resin composition.

(2) Performance evaluation of resin composition for optical parts (bending strength)
From the pellet obtained in the above (1), using a 50-ton injection molding machine (manufactured by Nippon Steel Works), a test piece according to ASTM D790 is prepared, and the bending strength is measured by a method according to ASTM D790. went. The results obtained are shown in Table 7.

(Metal corrosion resistance)
Metal corrosion resistance was evaluated in the same manner as in Example 1. The results obtained are shown in Table 7.

(3) Manufacture of optical parts Using pellets of the resin composition for optical parts obtained in (1) above, using a 50-ton injection molding machine (manufactured by Nippon Steel Works) as a molding machine, a mold temperature of 140 An optical pickup housing for a digital versatile disk (DVD) was molded under the conditions of ℃ and an injection molding temperature of 320 ℃. An overview photograph of the sample of the obtained optical pickup housing is shown in FIG.

(4) Performance evaluation of optical components (formability (dimensional accuracy))
The dimensions of the optical pickup housing molded in (3) above were measured with a measuring microscope, and it was confirmed that all the materials had the specified dimensions.

(Optical axis misalignment)
Evaluation of the optical axis deviation of the optical pickup housing was performed by using the optical pickup optical axis measuring device shown in the schematic diagram of FIG. 2 composed of a thermostatic chamber and a tilt sensor for the optical pickup housing obtained in (3) above.
In the measurement of the optical axis deviation (angle) of the digital versatile disk by this optical pickup device, first, the half mirror surface was fixed horizontally, irradiated with laser light at 25 ° C., and the reflection angle was measured. Next, after raising the temperature to 80 ° C. at 10 ° C./1 hour, the laser beam was irradiated again and the reflection angle was measured. The difference between the reflection angle at 80 ° C. and the reflection angle at 25 ° C. was defined as the optical axis deviation (angle, minute). The reflection angle was measured using a measuring apparatus equipped with a non-contact angle measuring mechanism. The resolution of this measuring mechanism is 0.04 minutes. The results obtained are shown in Table 7.

Examples 2 and 3 and Comparative Examples 1 and 2
A resin composition for optical parts was produced in the same manner as in Example 1 except that the addition amounts of calcium carbonate and basic metal silicate were changed as shown in Table 7, and optical parts were further produced. The performance evaluation of the obtained resin composition and optical component was performed in the same manner as in Example 1. The results are shown in Table 7.

Example 4
100 parts by mass of polyphenylene sulfide obtained in Synthesis Example 27, 0.02 part by mass of basic metal silicate (A-13) obtained in Synthesis Example 16, syndiotactic polystyrene [manufactured by Idemitsu Kosan Co., Ltd .; Z130] 100 parts by mass, polystyrene [manufactured by PSJ; product name HH102] 100 parts by mass, calcium carbonate [manufactured by Shiraishi Kogyo; Whiten P30] 400 parts by mass, and glass fiber [manufactured by Asahi Fiber Glass; JAFT591] 300 parts by mass The parts were mixed and dry blended, and then melt kneaded at 320 ° C. using a twin screw extruder (manufactured by Toshiba Machine Co., Ltd .; TEM35) to obtain pellets of the resin composition.

  In the same manner as in Example 1, the obtained resin pellets were used to evaluate the bending strength and the corrosiveness of the resin composition, to further manufacture an optical component, and to evaluate the performance of the optical component. Table 8 shows the obtained results.

Examples 5 and 6 and Comparative Examples 3 and 4
A resin composition for optical components was produced in the same manner as in Example 4, except that the addition amounts of calcium carbonate, glass fiber, and basic metal silicate (A-13) were changed as shown in Table 8. Optical components were manufactured. The performance evaluation of the obtained resin composition and optical component was performed in the same manner as in Example 1. The results are shown in Table 8.

The present invention can provide a resin composition for optical parts suitable as a molding material for an optical system housing such as an optical pickup device.
Furthermore, the present invention can provide an optical component that has a very small optical axis shift formed by molding the above resin composition for optical components, and has low mechanical strength, metal corrosiveness, and odor.

It is a photograph which shows the general view of the sample for optical axis measurement used in the Example. It is a schematic diagram which shows the optical pick-up optical axis measuring machine used in the Example.

Claims (5)

[1] For 100 parts by mass of polyarylene sulfide,
[2] 150 to 450 parts by mass of calcium carbonate,
[3] 100 to 400 parts by mass of glass fiber, and [4] a basic metal silicate salt produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water, having a general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.30. ]
And a basic metal silicate produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water, wherein the general formula (2)
sM ¹ O · tM ² O · mSiO ₂ (2)
Wherein (2), ^{M 1} is Ca, ^{M 2} represents a Mg, a s + t = 1, m has a value ranging from 0.02 to 0.30. ]
The resin composition for optical components formed by adding 0.02-10 mass parts of at least 1 type selected from the group which consists of basic silicate metal salt shown by these.   Furthermore, 30 to 250 of at least one resin selected from the group consisting of [5] syndiotactic polystyrene (SPS) resin, polystyrene resin and polyphenylene oxide resin is used per 100 parts by mass of [1] polyarylene sulfide. The resin composition for optical components according to claim 1, wherein the resin composition is added by mass parts.   The resin composition for optical components according to claim 1, wherein the polyarylene sulfide is polyphenylene sulfide.   The optical component formed by injection-molding the resin composition for optical components of any one of Claims 1-3.   The optical pick-up housing formed by injection-molding the resin composition for optical components of any one of Claims 1-3.