JP2003261750A - Polyester resin composition and light reflector using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyester resin composition that has both of antistatic characteristics and resistance to heat, and a light reflector using the same. <P>SOLUTION: The polyester resin composition comprises (a) 100 pts.wt. of a thermoplastic polyester resin, (b) 0-100 pts.wt. of an inorganic filler, (c) 0-400 pts.wt. of at least one kind of polycarbonate, (d) an antistatic agent in an amount of 0.1-50 pts.wt. per 100 pts.wt. of the components (a), (b) and (c) in total and has a deflection temperature of ≥120°C under a load of 4.6 kg/cm<SP>2</SP>. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a polyester resin composition having both antistatic property and heat resistance, and a light reflector comprising the same.

[0002]

BACKGROUND OF THE INVENTION A light reflector is a light source that is formed by processing metal or plastic into a cylinder, bowl, or the like, or by bending it in order to spread the light obtained from the light source. Is arranged to reflect light, and is widely used for headlamp reflectors and extensions of automobiles, interior lighting, interior lighting, and the like. Materials for such light reflectors include
A plastic material has been used instead of a metal because of its light weight and easy shape processing. Further, thermoplastic plastics are preferred and used over thermosetting plastics because of their ease of recycling, fluidity, and ease of processing.

However, thermoplastics are
Poor resistance to heat from the light source has been cited as a problem. Furthermore, when the surface is subjected to secondary processing such as metal, silicon, or plating to be used as a light reflector, dust may be adsorbed on the surface between the forming step and the secondary processing step. Since the surface morphology of the product after the secondary processing is greatly affected, the product yield is reduced. This occurs remarkably when a thermoplastic resin containing an inorganic filler is used as a molded product in order to impart properties such as low molding shrinkage, heat resistance, and strength. Thermoplastics with added inorganic filler need to be pre-treated before secondary processing, but the dust adhering to the molded product is covered with the primer used for the pre-treatment and appears in a more enlarged form. However, it adversely affects the subsequent secondary processing, resulting in a decrease in product yield. This has also caused problems such as equipment improvements and equipment investment. In view of such conventional techniques, the present inventor has conducted extensive studies, and as a result, contains a specific amount of a thermoplastic polyester and an antistatic agent, and if necessary, an inorganic filler and / or a polycarbonate, and is 4.6 kg / cm ² . By using a polyester resin composition with a measured deflection temperature under load of 120 ° C or higher in the shape of a light reflector, it exhibits sufficient heat resistance as a product and dramatically reduces the decrease in productivity due to dust. The present invention has been completed based on the finding that it can be done.

In Japanese Patent Laid-Open No. 11-53744, a polyester composition comprising a thermoplastic polyester and an antistatic agent is melt-molded and then heated and humidified to obtain a surface specific resistance value and a withstand voltage halved. A method for producing a molded product having a time of not more than a specific value is described, and Japanese Patent Application Laid-Open No. Hei 2
JP-A-151650 describes a thermoplastic polyester resin composition comprising a thermoplastic polyester resin, an antistatic agent, and an organic phosphorus compound and / or an organic chelating agent. The suitability of the body for light reflector applications is not mentioned.

Further, in Japanese Patent Laid-Open No. 11-61382, light reflection is obtained by directly vapor-depositing metal on a molded article made of a polyester resin composition containing a polyalkylene terephthalate resin, a modified silicone oil and a fine powder filler. It is described that the body is described and an antistatic agent may be added to the resin composition. Japanese Patent Laid-Open No. 11-1019
No. 05 publication discloses a polybutylene terephthalate resin,
Described is a method for producing a light reflector in which a polycarbonate resin and a resin composition composed of an inorganic filler are molded into a molded body, and a light-reflecting metal layer is directly formed on the molded body, and the resin composition has an antistatic property. It is described that the agent can be incorporated. Japanese Patent Application Laid-Open No. 11-241005 discloses direct metal vapor deposition on a molded article made of a polyester resin composition containing a polyalkylene terephthalate resin, a polycarbonate resin, a modified silicone oil, an organic phosphorus compound, and a fine powder filler. It is described that the light reflector is formed, and that the resin composition may contain an antistatic agent. In JP-A-2000-35509, a resin composition containing a polybutylene terephthalate resin, a polyethylene terephthalate resin, and an inorganic filler is molded into a molded body, and a light-reflecting metal layer is directly formed on the molded body. The method for producing a light reflector is described, and it is described that an antistatic agent may be added to the resin composition. JP 2
No. 000-322918 discloses a molded article made of a polyester resin composition containing a polyalkylene terephthalate resin, a polycarbonate resin, a specific polyester resin, a modified silicone oil, an organic phosphorus compound, and a fine powder filler. It describes a light reflector formed by direct metal vapor deposition, and describes that an antistatic agent may be added to the resin composition. However, these publications do not describe that a light reflecting layer is formed after applying a primer to a molded body made of a resin composition, and the modified silicone oil described therein reduces heat resistance and causes bleeding. It is not preferable because it reduces the adhesion to the primer due to out.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a polyester resin composition having both antistatic property and heat resistance, and a light reflector using this composition.

[0007]

SUMMARY OF THE INVENTION The polyester composition according to the present invention is
(A) 100 parts by weight of thermoplastic polyester, (b) 0 to 100 parts by weight of inorganic filler, (c) 0 to 400 parts by weight of polycarbonate, (d) an antistatic agent (a), (b), 0.1 to 50 parts by weight per 100 parts by weight of (c), 4.6 kg / cm
It is characterized in that the deflection temperature under load measured with ^two loads is 120 ° C or higher.

In the present invention, the antistatic agent is at least one antistatic agent selected from sulfonates, ammonium salts and polyethers, and the surface resistance value of the molded article obtained by injection molding is It is preferably 10 ¹⁴ Ω or less when a voltage of 50 V is applied. The light reflector according to the present invention has a surface gloss of 80% on at least a part of the surface of the molded product made of the polyester resin composition.
It is characterized by having the above-mentioned light reflection layer.

The light reflector according to the present invention preferably has a primer layer between the molded body made of the polyester resin composition and the light reflection layer.

[0010]

DETAILED DESCRIPTION OF THE INVENTION The polyester resin composition according to the present invention and the light reflector using the composition will be specifically described below. The polyester resin composition according to the present invention contains (a) a thermoplastic polyester, (d) an antistatic agent, and optionally (b) an inorganic filler and / or (c) a polycarbonate.

First, each component for molding the polyester resin composition according to the present invention will be described. (A) Thermoplastic polyester As the (a) thermoplastic polyester used in the present invention, various ones can be used, but a thermoplastic polyester obtained by polymerizing a bifunctional carboxylic acid and a diol component is particularly preferable. Is.

Here, as the bifunctional carboxylic acid, for example, aromatic dicarboxylic acids such as terephthalic acid, isoterephthalic acid and naphthalenedicarboxylic acid, and a mixture thereof may be used if necessary. Among these, terephthalic acid is particularly preferable in terms of price and the like. Further, within a range that does not impair the effects of the present invention, aliphatic dicarboxylic acids such as oxalic acid, malonic acid, adipic acid, suberic acid, azelaic acid, sebacic acid, decanedicarboxylic acid, cyclohexanedicarboxylic acid and ester-forming derivatives thereof. Other difunctional carboxylic acids can also be used.

Examples of the diol component include ethylene glycol, propylene glycol, 1,4-butanediol, trimethylene glycol, tetramethylene glycol, neopentyl glycol, diethylene glycol,
Cyclohexanedimethanol, heptane-1,7-diol, octane-1,8-diol, neopentyl glycol, decane-1,10-diol and other straight-chain aliphatic and alicyclic diols having 2 to 15 carbon atoms; Polyethylene glycol; 2,2-bis (4-hydroxyphenyl) propane called bisphenol A, bis (4-hydroxyphenyl)
Methane, bis (4-hydroxyphenyl) naphthylmethane,
Bis (4-hydroxyphenyl) phenylmethane, bis (4-
Hydroxyphenyl)-(4-isopropylphenyl) methane, bis (3,5-dichloro-4-hydroxyphenyl) methane, bis (3,5-dimethyl-4-hydroxyphenyl) methane, 1,1-bis (4- Hydroxyphenyl) ethane, 1-naphthyl-1,1-bis (4-hydroxyphenyl) ethane, 1-phenyl-1,1-bis (4-hydroxyphenyl) ethane, 1,2-bis
(4-hydroxyphenyl) ethane, 2-methyl-1,1-bis (4-
Hydroxyphenyl) propane, 2,2-bis (3,5-dimethyl)
-4-Hydroxyphenyl) propane; 1-ethyl-1,1-bis
(4-hydroxyphenyl) propane, 2,2-bis (3,5-dichloro-4-hydroxyphenyl) propane, 2,2-bis (3,5-
Dibromo-4-hydroxyphenyl) propane; 2,2-bis (3
-Chloro-4-hydroxyphenyl) propane, 2,2-bis (3-
Methyl-4-hydroxyphenyl) propane, 2,2-bis (3-
Fluoro-4-hydroxyphenyl) propane, 1,1-bis (4
-Hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) butane, 1,4-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) pentane, 4-methyl-2 , 2-bis (4-hydroxyphenyl) pentane, 2,2-
Bis (4-hydroxyphenyl) hexane, 4,4-bis (4-hydroxyphenyl) heptane, 2,2-bis (4-hydroxyphenyl) nonane, 1,10-bis (4-hydroxyphenyl) decane, 1, 1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, 2,2-bis (4-hydroxyphenyl)-
Dihydroxydiarylalkanes such as 1,1,1,3,3,3-hexafluoropropane; 1,1-bis (4-hydroxyphenyl) cyclohexane, 1,1-bis (3,5-dichloro-4-hydroxy) (Phenyl) cyclohexane, 1,1-bis (4-hydroxyphenyl) cyclodecane and other dihydroxydiarylcycloalkanes; bis (4-hydroxyphenyl) sulfone, bis (3,5-dimethyl-4-hydroxyphenyl) sulfone, bis ( Dichlorodiaryl sulfones such as 3-chloro-4-hydroxyphenyl) sulfone; Dihydroxydiaryl ethers such as bis (4-hydroxyphenyl) ether and bis (3,5-dimethyl-4-hydroxyphenyl) ether; 4,4 '-Dihydroxybenzophenone;
Dihydroxy diaryl ketones such as 3,3 ', 5,5'-tetramethyl-4,4'-dihydroxybenzophenone; bis (4-
Hydroxyphenyl) sulfide, bis (3-methyl-4-hydroxyphenyl) sulfide, bis (3,5-dimethyl-4-
Dihydroxydiaryl sulfides such as hydroxyphenyl) sulfides; Dihydroxydiaryl sulfoxides such as bis (4-hydroxyphenyl) sulfoxide; Dihydroxydiphenyls such as 4,4'-dihydroxydiphenyl; 9,9-bis (4-hydroxyphenyl) ) Dihydric phenols such as dihydroxyarylfluorenes and dihydroxybenzenes such as hydroquinone, resorcinol and methylhydroquinone; commonly used ones such as 1,5-dihydroxynaphthalene and dihydroxynaphthalene such as 2,6-dihydroxynaphthalene Can be used without problems. Further, if necessary, two or more kinds of diol components may be used in combination.

Polyethylene terephthalate (PET) and polybutylene terephthalate (PBT) are particularly preferable as the polyester obtained by polymerizing such a bifunctional carboxylic acid and a diol component. This thermoplastic polyester (a) is made of titanium, germanium,
It can be produced in the presence or absence of a general polycondensation catalyst typified by antimony, or can be produced by an interfacial polymerization method, a melt polymerization method or the like.

In the polyester resin composition according to the present invention, one type of thermoplastic polyester (a) may be used alone, or two or more types may be used in combination. Further, it may be used as a copolyester if necessary. When two or more thermoplastic polyesters (a) are used in combination, for example, a combination of polybutylene terephthalate and polyethylene terephthalate is preferable.

The molecular weight of the thermoplastic polyester (a) used in the present invention is not limited as long as it does not impair the physical properties of the molded article, and needs to be optimized depending on the type of thermoplastic polyester used. However, the weight average molecular weight in terms of polystyrene measured by GPC is 1
It is preferably from 20,000 to 200,000, particularly 2
It is preferably from 0.001 to 150,000. When the weight average molecular weight is within the above range, the molded product has high mechanical properties when molded and is also excellent in moldability. When the thermoplastic polyester (a) having a weight average molecular weight of less than 10,000 is used, the mechanical properties of the resin itself may be insufficient, and for example, the mechanical properties of the molded product may be insufficient. If it is more than 200,000, the moldability may be deteriorated, for example, the melt viscosity during molding may be increased.

(B) Powdered Inorganic Filler The powdered inorganic filler (b) optionally used in the present invention is a naturally occurring or artificially produced clay mineral, acicular mineral such as mica. , Potassium titanate whiskers, kaolin, clay, talc, wollastonite, etc. are used. Among these, talc having an average particle size of 50 μm or less is preferable.

These production methods are not particularly limited except for controlling the water content. For example, when talc is produced from a natural mineral, the rough stone is firstly crushed by a tube mill, an impact crusher or a micron mill. Machine, centrifugal roller type Raymond mill, etc., and if further pulverization is required, micron mill, jet type pulverizer,
Dry or wet fine pulverization may be performed with a jet-o-mizer, a micronizer, a jet palpelizer, a stirring mill (tower mill), a vibration mill, a colloid mill, or the like. Then, these crushed fillers were mixed with cyclone, multilon, micron separator, microplex,
Cyclone air separator, ultra separator,
It is a device such as jet cron, clasiclone, rake classifier, hydrocyclone, hydraulic classifier, centrifugal classifier,
Physical properties such as particle size may be adjusted by performing dry or wet classification by repeating once or plural times.

It is desirable that the powdered inorganic filler (b) is controlled to have an attached water content of 0.25% by weight or less, preferably 0.2% by weight or less. In the present invention, the amount of attached water in the powdered inorganic filler (b) is ACUA manufactured by Hiranuma Kagaku Co., Ltd.
It is measured as the weight (% by weight) in the powdered inorganic filler (b) by the Karl Fischer method using COUNTER AQ-6. The method of adjusting the water content of the powdery inorganic filler (b) is usually the same as the method of drying these.
Since the drying time, the drying method, etc. differ depending on the type of the powdered inorganic filler (b) used and the manufacturing method, the control of the water content is appropriately selected depending on the powdered inorganic filler (b) used. When the amount of water adhering to the powdered inorganic filler (b) is controlled in this manner, the melt stability of the composition is increased, and a molded product having a good appearance can be molded. This is because the powdered inorganic filler (b) in which the amount of attached water is controlled is
It is considered that moisture is absorbed from the resin or the rubber-like elastic body during molding, and the appearance of the molded product is kept good.

The content of the powdery inorganic filler (b) in the polyester resin composition of the present invention is usually 0 to 100 parts by weight based on 100 parts by weight of the polyester (a),
Preferably 5 to 40 parts by weight, more preferably 15 to 30
Parts by weight. When the content of the powdery inorganic filler (b) is within the above range, the composition tends to have excellent heat resistance and dimensional stability.

(C) Polycarbonate Polycarbonate (c) that may be used in the present invention
The aromatic polycarbonates produced by the known phosgene method or the melting method (for example, JP-A-63-21).
5763 and JP-A-2-124934).
Can be used. Polycarbonate is composed of a carbonate component and a diphenol component. Examples of the precursor for introducing the carbonate component include phosgene and diphenyl carbonate.

Examples of diphenols include 2,2-bis (4-hydroxyphenyl) propane (so-called bisphenol A); 2,2-bis (3,5-dibromo-4-hydroxyphenyl) propane; 2 , 2-Bis (3,5-dimethyl-4-hydroxyphenyl) propane; 1,1-bis (4-hydroxyphenyl) cyclohexane; 1,1-bis (3,5-dimethyl-4-hydroxyphenyl) cyclohexane; 1,1-bis (4-hydroxyphenyl) decane; 1,4-bis (4-hydroxyphenyl) propane; 1,1-bis (4-hydroxyphenyl) cyclododecane; 1,1-bis (3,5- Dimethyl-4-hydroxyphenyl) cyclododecane;
4,4-dihydroxydiphenyl ether; 4,4-thiodiphenol; 4,4-dihydroxy-3,3-dichlorodiphenyl ether; and 4,4-dihydroxy-2,
5-dihydroxy diphenyl ether etc. are mentioned.
These can be used alone or in combination. In addition to this, it is also possible to use a compound having three or more phenolic hydroxyl groups.

The polycarbonate (c) may be an aromatic copolyestercarbonate. This is in addition to the carbonate units derived from the known aromatic diols,
It has an ester unit derived from an aromatic diol and an aliphatic dicarboxylic acid having 6 to 18 carbon atoms. The phosgene method and the melting method known as a method for producing an aromatic polycarbonate can be used for the production thereof (US Pat. Nos. 4,238,596, 4,238,597 and 3,169,121). See the specification).

The content of the polycarbonate (c) in the polyester resin composition of the present invention is usually 0 to 400 parts by weight, preferably 0 to 100 parts by weight, more preferably 100 parts by weight of the thermoplastic polyester (a). Is 5
It is 50 parts by weight. When the content of the polycarbonate (c) is within the above range, the composition tends to have a high heat resistant temperature without deteriorating the dimensional stability.

(D) Antistatic Agent As the antistatic agent (d) used in the present invention, an antistatic agent such as an anionic antistatic agent, a cationic antistatic agent, a nonionic antistatic agent, an amphoteric antistatic agent, or the like is used. Examples thereof include a molecular type antistatic agent and a polymer type antistatic agent. As a suitable anionic antistatic agent, sodium alkyl sulfonate,
Sodium dodecylbenzene sulfonate is particularly preferred. The sodium alkyl sulfonate is, for example, sodium alkyl sulfonate whose alkyl group is a linear alkyl group having 12 to 16 carbon atoms, and is usually used as a mixture.

Suitable cationic antistatic agents include phosphonium alkyl sulfonates, phosphonium alkylbenzene sulfonates and quaternary ammonium salt compounds. The alkyl group has 4 to 20 carbon atoms.
The linear alkyl group of is preferably used. As such a cationic antistatic agent, tetrabutylphosphonium alkylsulfonate and tetrabutylphosphonium dodecylbenzenesulfonate are particularly preferable. The tetrabutylphosphonium alkyl sulfonate is, for example, sodium alkyl sulfonate whose alkyl group is a linear alkyl group having 12 to 16 carbon atoms, and usually,
Used as a mixture.

Suitable nonionic antistatic agents include polyoxyethylene derivatives, polyhydric alcohol derivatives and alkyl ethanolamines. As the polyoxyethylene derivative, for example, polyethylene glycol having a number average molecular weight of 500 to 100,000 is preferably used. Suitable amphoteric antistatic agents include alkyl betaine and sulfone betaine derivatives.

Suitable polymer type antistatic agents include polyoxyethylene glycol methacrylate copolymers, polyether amides, polyether ester amides, polyether amide imides, polyalkylene oxide copolymers, polyethylene oxide epichlorohydrin copolymers. , Polyether ester amides, polybutylene terephthalate ionomers and polyethylene terephthalate ionomers. As the polymer type antistatic agent, polyether ester amide, polyalkylene oxide copolymer and polyether ester are preferable.

Among these, antistatic agents selected from sulfonates, ammonium salts and polyethers are preferable, and sodium alkylsulfonate is particularly preferable. The content of the antistatic agent (d) in the polyester resin composition of the present invention is usually 0.1 to 50 parts by weight, based on 100 parts by weight of the total amount of (a), (b) and (c).
Preferably 0.1 to 25 parts by weight, more preferably 1 to 1
0 parts by weight. When the content of the antistatic agent (d) is within the above range, the composition does not change other physical properties,
A target surface resistance value can be given.

Other Components In addition to the above components, the polyester resin composition according to the present invention may contain other components such as a phosphorus-based stabilizer and a release agent. As the phosphorus-based stabilizer, for example, any of those commercially available as antioxidants from each stabilizer manufacturer can be used. Specifically, triphenyl phosphite, diphenyl nonyl phosphite, tris (2,4
-Di-t-butylphenyl) phosphite, trisnonylphenylphosphite, diphenylisooctylphosphite, 2,2'-methylenebis (4,6-di-t-butylphenyl) octylphosphite, diphenylisodecylphosphite , Diphenylmono (tridecyl) phosphite, 2,2'-ethylidene bis (4,6-di-t
-Butylphenol) fluorophosphite, phenyldiisodecylphosphite, phenyldi (tridecyl)
Phosphite, tris (2-ethylhexyl) phosphite, tris (isodecyl) phosphite, tris (tridecyl) phosphite, dibutylhydrogenphosphite, trilauryltrithiophosphite, tetrakis (2,4-di-t-butylphenyl) -4,4'-biphenylenediphosphonite, 4,4'-isopropylidenediphenol alkyl (C12-C15) phosphite,
4,4'-butylidene bis (3-methyl-6-t-butylphenyl) ditridecyl phosphite, bis (2,4-
Di-t-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite, bis (nonylphenyl) pentaerythritol diphosphite, distearyl- Pentaerythritol diphosphite, phenyl-bisphenol A pentaerythritol diphosphite, tetraphenyldipropylene glycol diphosphite, 1,1,3-tris (2-methyl-4)
-Di-tridecyl phosphite-5-t-butylphenyl) butane, 3,4,5,6-dibenzo-1,2-oxaphosphane-2-oxide and the like can be used.

As an example of an available product, ADEKA STAB
PEP-36, PEP-24, PEP-4C, PEP-
8 (all are trademarks, manufactured by Asahi Denka Kogyo Co., Ltd.), Irgaf
os168 (trademark, manufactured by Ciba Specialty Chemicals), Sandstab P-EPQ (trademark, manufactured by Sandoz), Chelex L (trademark, manufactured by Sakai Chemical Industry Co., Ltd.), 3P2S (trademark, Ihara Chemical Industry) (Inc.), Mark 329K, Mark
P (all are trademarks, manufactured by Asahi Denka Co., Ltd.), and We
Ston 618 (trademark, manufactured by Sanko Chemical Co., Ltd.) and the like. Inorganic phosphoric acid such as phosphoric acid, phosphorous acid, and pyrophosphoric acid, methyl phosphoric acid, ethyl phosphoric acid, propyl phosphoric acid, isopropyl phosphoric acid, butyl phosphoric acid, lauryl phosphoric acid, stearyl phosphoric acid, 2-ethylhexyl phosphoric acid, isodecyl phosphoric acid , Acidic alkyl phosphates, such as sodium dihydrogen phosphate, sodium dihydrogen phosphate, sodium hydrogen metaphosphate, potassium polyphosphate, sodium polyphosphate, potassium metaphosphate, sodium metaphosphate,
Condensed phosphates such as sodium dihydrogen pyrophosphate, calcium dihydrogen pyrophosphate, disodium dihydrogen pyrophosphate, and metal salts such as aluminum phosphate, magnesium phosphate, zinc phosphate, and aluminum phosphate may be used as necessary. Can be used.

Further, a hindered phenol type antioxidant, an epoxy type stabilizer, a sulfur type stabilizer and the like may be added. Examples of the hindered phenol-based antioxidant include n-octadecyl-3- (3 ', 5'-di-
t-Butyl-4-hydroxyphenyl) propionate, 2,6-di-t-butyl-4-hydroxymethylphenol, 2,2′-methylenebis (4-methyl-6-t
-Butylphenol), pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, and the like. Examples of the epoxy-based stabilizer include epoxidized soybean oil, epoxidized linseed oil, phenylglycidyl ether, allylglycidyl ether, 3,4-epoxycyclohexylmethyl-3 ′, 4′-epoxycyclohexanecarboxylate.

A releasing agent may be added to the polyester resin composition of the present invention for the purpose of improving the releasing property. Preferred release agents include silicone-based release agents such as methylphenyl silicone oil, pentaerythritol tetrastearate, glycerin monostearate, montanic acid wax, ester release agents such as polyalphaolefin, and olefin-based release agents. And polyethylene.

Further, the polyester resin composition of the present invention is a synthetic resin other than the various additive components such as the thermoplastic polyester (a) and the polycarbonate (c) depending on the purpose, as long as the physical properties are not impaired. ,
Other stabilizers such as hindered phenols and amines,
UV absorbers such as benzotriazole type and benzophenone type, light stabilizers of hindered amine type, internal lubricants such as aliphatic carboxylic acid ester type, paraffin type, silicone oil, polyethylene wax, flame retardant, flame retardant aid, organic filler , A colorant and the like can be added.

Composition The polyester resin composition according to the present invention comprises (a) a thermoplastic polyester as described above, (d) an antistatic agent, and
(B) inorganic filler and / or (c) as required
Made of polycarbonate. The polyester resin composition of the present invention has a deflection temperature under load measured by a load of 4.6 kg / cm ² of 120 ° C or higher, preferably 160 ° C or higher.

The deflection temperature under load was 4.6 kg / c when a 127 × 12.7 × 6.4 mm test piece obtained by injection molding was placed horizontally on a fulcrum with a span distance of 100 mm.
It is the temperature when a load of m ² is applied, the sample is left for 5 minutes, the temperature is raised at a rate of 2 ° C./min, and the test piece has a deflection of 0.25 mm. In addition, the polyester resin composition of the present invention has a surface resistance of a molded product obtained by injection molding of 50 or less.
When a voltage of V is applied, it is 10 ¹⁴ Ω or less, preferably 5.0 × 10 ¹³ Ω or less.

Production Method of Polyester Resin Composition The polyester resin composition according to the present invention can be prepared by blending and kneading the above-mentioned respective components. For the blending and kneading, a method usually used,
For example, a ribbon blender, a Henschel mixer, a Banbury mixer, a drum tumbler, a single-screw extruder, a twin-screw extruder, a co-kneader, a multi-screw extruder can be used. The heating temperature during kneading is usually selected in the range of 230 to 300 ° C.

The polyester resin composition according to the present invention is
Suitable for molded articles such as light reflector applications and lighting applications by applying various known molding methods such as injection molding, gas-assisted injection molding, hollow molding, extrusion molding, compression molding, calendar molding, and rotation molding. Used. The polyester resin composition of the present invention has an excellent effect of preventing adhesion of dust after molding.

Light Reflector In the light reflector according to the present invention, a light reflection layer is formed on the surface of a molded product made of the above polyester resin composition.
The light reflector of the present invention preferably has a primer layer between the molded product made of the polyester resin composition and the light reflection layer. Such a light reflector is manufactured, for example, by molding the above polyester resin composition into a predetermined shape such as a cylinder shape or a bowl shape by heat molding, and then forming a light reflection layer on the surface of the molded body. be able to. When forming this light reflecting layer, it is preferable to carry out a primer coating as a pre-process.

The light reflecting layer is formed by plating the surface of the molded product,
It can be formed by forming a layer made of metal by vapor deposition. In particular, a physical vapor deposition method (PVC method) using aluminum as a raw material is widely used. The light reflection layer is
The surface gloss is preferably 80% or more. The surface gloss can be obtained by using a UGV4D manufactured by Suga Test Instruments Co., Ltd., installing a test piece at an angle of 60 degrees from the light source, and measuring the amount of reflected light.

The light reflector according to the present invention is excellent in antistatic property and heat resistance. Further, since the light reflector according to the present invention uses the polyester resin composition as described above, the surface of the molded product obtained by heat molding the polyester resin composition is subjected to secondary processing such as plating. When the light reflecting layer is formed, dust is less adsorbed on the surface of the molded product between the molded product forming step and the secondary processing step, and the product yield is high. Even when the primer is subjected to the base treatment before the secondary processing of the molded body, dust is rarely adsorbed to the surface of the molded body subjected to the base treatment.

[0042]

The polyester resin composition and the light reflector of the present invention are excellent in antistatic property and heat resistance.

[0043]

EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded.

[0044]

[Examples 1 and 2 and Comparative Example 1] The components were mixed in the proportions shown in Table 1 and mixed at 260 ° C, 200 rpm, 100 kg / h.
Was extruded by a twin-screw extruder set to 1 to prepare pellets. The prepared pellets were dried at 120 ° C. for 2 hours and injection-molded to obtain a 50 × 50 × 3 mm plate-shaped molded product and a sample for measuring physical properties. The plate-shaped molded product was subsequently subjected to the same undercoating treatment and vacuum deposition using aluminum to form a reflective layer. Using these, heat resistance evaluation, surface resistance evaluation, and reflective layer formability and its stability evaluation were performed. The reflective layer formability was visually observed as follows. 1-When a fluorescent lamp is projected, it can be seen clearly 2-When a fluorescent lamp is projected, some dust is seen. 3-When you look at a fluorescent lamp, dust is very noticeable. In addition, the stability evaluation is 1000 in a heating oven at 120 ° C.
It was carried out by leaving it for a while, and the following judgments were made. 1-When the fluorescent lamp is projected, it is possible to see clearly. 2-When the fluorescent lamp is projected, it looks somewhat blurred. 3-When a fluorescent lamp is projected, it looks blurry and cannot be identified as a fluorescent lamp. The results are shown in Table 1.

In these examples and comparative examples,
The following ingredients were used: Polybutylene terephthalate (PBT): GE Plastics Co., Ltd., 195,315 Polyethylene terephthalate (PET): Mitsubishi Rayon Co., Ltd., MA-580 Talc: Fuji Talc Industry Co., Ltd., NK48 Antistatic agent: Clariant SAS9 manufactured by Japan Co., Ltd.
Three Release agent: manufactured by Cognis Japan Ltd., PETS Antistatic property was measured as follows.

A molded product of 50 × 50 × 3 mm is subjected to R at 25 ° C.
After aging in H50% for 24 hours, the surface resistance value was measured at 50V.

[0047]

[Table 1]

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C08K 5/42 C08K 5/42 C08L 69/00 C08L 69/00 (72) Inventor Yu Furukawa Tochigi Prefecture 2-2 Kinugaoka, Moka City Japan G-Plastics Co., Ltd. F-term (reference) 4F071 AA43 AA50 AC12 AC14 AE16 AF29 4F100 AA01A AC01A AK41A AK45A AL05A BA02 BA03 BA07 BA10A BA10B CA22A CA23A DC30B EJ65C GB90 J20J03J16A16A16A JN21B YY00A YY00B 4J002 CF00W CF093 CG00X CH013 CL073 DE186 DJ006 DJ036 DJ046 DJ056 EN137 EV257 EW177 FA066 FD016 FD103 FD107 GP00

Claims (4)

[Claims] 1. (a) 100 parts by weight of a thermoplastic polyester, (b) 0 to 100 parts by weight of an inorganic filler, (c) 0 to 400 parts by weight of at least one polycarbonate, and (d) an antistatic agent. It is contained at a ratio of 0.1 to 50 parts by weight with respect to 100 parts by weight of the total of (a), (b), and (c), and the deflection temperature under load measured with a load of 4.6 kg / cm ² is 120 ° C. or higher. And a polyester resin composition. 2. The antistatic agent is at least one selected from sulfonates, ammonium salts and polyethers.
It is an antistatic agent of more than one kind, and the surface resistance value of the molded product obtained by injection molding is 1 when a voltage of 50 V is applied.
The polyester resin composition according to claim 1, which has a resistance of 0 ¹⁴ Ω or less. 3. A light-reflecting body having a light-reflecting layer having a surface gloss of 80% or more on at least a part of the surface of a molded body made of the polyester resin composition according to claim 1. . 4. The light-reflecting molded article according to claim 3, which has a primer layer between the molded article made of the polyester resin composition and the light-reflecting layer.