JPH1060242A - Reinforced polyester resin composition and its molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a lightweight reinforced flame-retardant polyester resin composition good in mechanical characteristics, extremely small in the anisotropy of a molded product and little in warpage, and to obtain its molded product. SOLUTION: This reinforced polyester resin composition comprises (A) 100 of a thermoplastic polyester resin containing polybutylene terephthalate as an essential component, (B) 2-95 pts.wt. of a styrenic resin, (C) 0-30 pts.wt. of a polyolefin copolymer, (D) 2-60 pts.wt. of an organic bromine compound, (E) 0.2-30 pts.wt. of an antimony compound, (F) 0-5 pts.wt. of a fluororesin, (G) 2-170 pts.wt. of a fibrous inorganic filler having a fiber diameter of 2-50μm, and (H) 2-170 pts.wt. of a plate-like inorganic material having an average particle diameter of 300-3000μm. The component (G) is used in an amount of 0.25-4 times that of the component (H).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced polyester resin composition having good mechanical properties, extremely small anisotropy of a molded product, light weight and little warpage, and a molded product thereof.

[0002]

2. Description of the Related Art Polybutylene terephthalate (PBT)
Has recently been excelling in mechanical properties, heat resistance and chemical resistance.
It is used for applications such as mechanical parts. Furthermore, as the required characteristics for these applications, for example, in the field of electronic connectors and the like, pins are often pressed in when further assembling the connector, so that good mechanical properties and adhesion when the connector is coupled are improved. There is a demand for small anisotropic molded products. In addition, there has been a demand for a molded product that is lightweight and has little warpage. Further, in order to use in these applications, a material that satisfies the flame retardancy specified in the UL standard has been required.

[0003] JP-B-58-19697 and JP-B-6-19697
No. 2,294,450 and Japanese Patent Publication No. 61-59347, in which glass fiber and glass powder are used in combination with a polyester resin.
No. 9 discloses a method in which a glass fiber and an inorganic filler having a specific particle diameter are used for a polyetherester or an acrylonitrile-styrene copolymer in PBT.
41699, JP-B-55-41700 and JP-B-57-57059, using glass flakes or inorganic solids and epoxy compounds.
No. 1028, Japanese Patent Publication No. 5-46382, Japanese Patent Publication No. 2-33067, Japanese Patent Application Laid-Open No. 4-1260, Japanese Patent Application Laid-Open No. 4-239546, and Japanese Patent Application Laid-Open No. 5-98138. Method of using a combination of a system resin, a fibrous reinforcing agent and a plate-like or spherical reinforcing agent, and a method of using a fluorine atom-containing compound having a specific particle size, a rubber and a filler as a fire retardant disclosed in JP-A-63-291947 Are disclosed.

However, although these polymers and fillers can provide materials satisfying a certain degree of anisotropy, they have good mechanical properties and extremely low anisotropy, and are provided with flame retardancy with little warpage. It was not sufficient as a method for stably obtaining molded articles.

The method of using a polycarbonate resin, a fibrous filler and a plate-like filler in PBT disclosed in JP-A-59-189170 is excellent in impact strength and anisotropy, but is excellent in PBT inherent in PBT. There is a problem that the chemical resistance, which is a property, is reduced.

[0006]

Accordingly, the present invention provides a reinforced flame-retardant polyester resin composition having good mechanical properties and extremely low anisotropy and imparted with flame retardancy,
It is an object to stably obtain a light-weight molded product with little warpage.

[0007]

The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have arrived at the present invention. That is, the present invention relates to "(A) 100 parts by weight of a thermoplastic polyester resin containing polybutylene terephthalate as an essential component, and (B) a styrene resin of 2 to 95 parts by weight.
Parts by weight, (C) 0 to 30 parts by weight of a polyolefin copolymer, (D) 2 to 60 parts by weight of an organic bromine compound, (E) 0.2 to 30 parts by weight of an antimony compound, (F) 0 to 5 parts of a fluororesin Parts by weight, (G) 2 to 170 parts by weight of a fibrous inorganic filler having a fiber diameter of 2 to 50 μm, and (H) plate-like inorganic substance 2 to 1
70 parts by weight, and the amount of the component (G) is 0.1% of the component (H).
(H) a reinforced polyester resin composition in which the average particle diameter of the plate-like inorganic substance is 300 to 3000 μm ”and“ a molded article obtained by injection molding the reinforced polyester resin composition ”. Become.

[0008]

Embodiments of the present invention will be described below. In the present invention, “weight” means “mass”.

The thermoplastic polyester resin of the component (A) of the present invention contains polybutylene terephthalate or a copolymer thereof as an essential component. Such a polymer is a polymer or a copolymer containing terephthalic acid or its ester-forming derivative and 1,4-butanediol or its ester-forming derivative as main components and obtained by a polycondensation reaction. Preferred examples of these polymers and copolymers include polybutylene terephthalate, polybutylene (terephthalate / isophthalate), polybutylene (terephthalate / adipate), polybutylene (terephthalate / sebacate), polybutylene (terephthalate / decanedicarboxylate), and polybutylene. Examples thereof include (terephthalate / naphthalate) poly (butylene / ethylene) terephthalate, and may be used alone or as a mixture of two or more. Those having a polybutylene terephthalate structural unit content of 50% by weight or more in the polymer are preferably used. Here, "/" means that copolymerization is performed.

(A) The thermoplastic polyester resin is not an essential component, but may contain other components. Such a polymer is a polymer or copolymer obtained by a polycondensation reaction containing dicarboxylic acid or an ester-forming derivative thereof and a diol or an ester-forming derivative thereof as main components.

The dicarboxylic acids include terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, bis (p
-Carboxyphenyl) methane, anthracenedicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid, 5
-Alicyclic acids such as aromatic dicarboxylic acids such as sodium sulfoisophthalic acid, aliphatic dicarboxylic acids such as adipic acid, sebacic acid, azelaic acid and dodecandioic acid, 1,3-cyclohexanedicarboxylic acid, and 1,4-cyclohexanedicarboxylic acid. Formula dicarboxylic acids and their ester-forming derivatives and the like.

The diol component has 2 to 2 carbon atoms.
20 aliphatic glycols, ie, ethylene glycol, propylene glycol, 1,4-butanediol,
Neopentyl glycol, 1,5-pentanediol,
1,6-hexanediol, decamethylene glycol,
Cyclohexanedimethanol, cyclohexanediol, etc., or a long-chain glycol having a molecular weight of 400 to 6000, that is, polyethylene glycol, poly-1,3-
Examples include propylene glycol, polytetramethylene glycol, and the like, and ester-forming derivatives thereof. Examples of these polymers or copolymers,
Polybutylene (terephthalate / isophthalate), polybutylene (terephthalate / isophthalate), polyethylene terephthalate, polyethylene (terephthalate / isophthalate), polyethylene (terephthalate / adipate), bisphenol A (terephthalate /
Isophthalate), polybutylene (terephthalate / naphthalate), polyethylene naphthalate, polycyclohexane dimethylene terephthalate, polycyclohexane dimethylene (terephthalate / isophthalate), poly (cyclohexane dimethylene / ethylene) terephthalate, poly (cyclohexane dimethylene / ethylene)
(Terephthalate / isophthalate) and the like.

Of these, polyethylene terephthalate, polycyclohexane dimethylene terephthalate, and poly (cyclohexane dimethylene / ethylene) terephthalate are preferably used.

The melt flow rate (MFR) of the above-mentioned thermoplastic polyester resin is from 1 to 100, especially from the melt point of the crystal measured by a differential calorimeter plus 20 ° C. Those having a range of 2 to 80 are preferable from the viewpoint of mechanical properties and moldability. If the MFR is less than 1, the fluidity during molding tends to decrease, and if the MFR exceeds 80, the impact strength tends to decrease. The sum of the content of polybutylene terephthalate or a copolymer thereof in the thermoplastic polyester resin (A) is 50 to 100% by weight, 50 to 99% by weight, and 60 to 99% by weight.
Is preferred. If the amount is too small, the heat resistance and chemical resistance inherent in polybutylene terephthalate tend to be impaired.

Further, these polymers and copolymers are represented by o
Those having an intrinsic viscosity of 0.36 to 1.60, particularly 0.52 to 1.25 when the chlorophenol solution is measured at 25 ° C. are suitable. If the intrinsic viscosity is less than 0.36, the mechanical properties are poor, while the intrinsic viscosity is 1.6.
If it exceeds 0, the moldability tends to be poor.

Further, these thermoplastic polyesters are:
Those having a COOH terminal group amount in the range of 1 to 50 eq / t (terminal group amount per ton of polymer) obtained by potentiometric titration of the m-cresol solution with an alkali solution are advantageous in terms of durability and anisotropy suppressing effect. Can be preferably used.

The styrene resin (B) used in the present invention is not particularly limited as long as it is a polymer containing a styrene structural unit, that is, an aromatic vinyl unit.

For example, (a) conjugated diene rubbers such as polybutadiene, butadiene / styrene copolymer, butadiene / acrylonitrile copolymer and the like, aromatic vinyl and acrylonitrile such as styrene, α-methylstyrene, dimethylstyrene and vinyltoluene; ABS resin obtained by graft polymerization of vinyl cyanide such as methacrylonitrile, and optionally other polymerizable monomers such as methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate and butyl methacrylate, ( B) AS resin by copolymerization of aromatic vinyl and vinyl cyanide exemplified above,
(C) HI (high impact) -polystyrene resin by copolymerization of conjugated diene rubber and aromatic vinyl exemplified above; (d) polystyrene resin composed of aromatic vinyl exemplified above; It is a block copolymer of vinyl and diene.

The structural unit of the block copolymer (e) may be a hydrogenated or unhydrogenated diene. Such a diene includes 1,3-butadiene,
Isoprene (2-methyl-1,3-butadiene), 2,
One or more hydrogenated or unhydrogenated conjugated dienes such as 3-dimethyl-1,3-butadiene, 1,3-butadiene, and 1,3-pentadiene. 3-butadiene and isoprene are preferably used. Specific examples of the block copolymer include hydrogenated or unhydrogenated SBS resin (styrene / butadiene / styrene triblock copolymer) and hydrogenated or unhydrogenated SIS.
Resins (styrene / isoprene / styrene triblock copolymer); and hydrogenated styrene / butadiene /
Styrene triblock copolymer (SEBS resin) is preferably used.

The amount of the styrene resin (B) is as follows:
(A) 2 to 95 parts by weight, preferably 5 to 90 parts by weight, and more preferably less than 2 parts by weight, based on 100 parts by weight of the thermoplastic polyester resin, there is no effect of the present invention. If it exceeds 95 parts by weight, polybutylene is used. Phthalates tend to impair their inherent properties such as heat resistance and chemical resistance.

The styrene resins (a) to (e) can be used alone or in combination. The styrene resin of (a) to (e) is preferably at least 30% by weight, more preferably at least 50% by weight, based on the whole of each of the styrene resins.

The (C) polyolefin copolymer used in the present invention is an olefin copolymer, and (a) α
A block copolymer of an epoxy group-containing copolymer composed of an olefin and an epoxy group-containing unsaturated monomer, and (b) an ethylene copolymer composed of ethylene and an α-olefin having 3 or more carbon atoms and / or a vinyl monomer. And a known method such as a high-pressure radical polymerization method, a solution polymerization method, and an emulsion polymerization method. Examples of the α-olefin of the epoxy group-containing copolymer (a) include ethylene, propylene, and butene-1. Specific examples of the epoxy group-containing unsaturated monomer include glycidyl acrylate, glycidyl methacrylate, and the like. Glycidyl ethacrylate, glycidyl itaconate, and the like; and glycidyl ether obtained by copolymerizing vinyl esters such as vinyl ethers, vinyl acetate, and vinyl propionate, and acrylic and methacrylic esters such as methyl, ethyl, propyl, and butyl. -Ters and glycidyl esters, specific examples of which include ethylene / glycidyl methacrylate copolymer, ethylene / vinyl acetate / glycidyl methacrylate copolymer, ethylene / methyl methacrylate / glycidyl methacrylate copolymer, Ethylene / acrylic Glycidyl copolymer acid, ethylene / vinyl acetate /
Glycidyl acrylate copolymer, ethylene / glycidyl ether copolymer and the like can be mentioned. Among them, ethylene / glycidyl methacrylate copolymer is most preferred.

The above (b) ethylene and α- having at least 3 carbon atoms
The α-olefin having 3 or more carbon atoms in an ethylene copolymer obtained by copolymerizing an olefin and / or a vinyl monomer includes propylene, butene-1, pentene-
1,3-methylpentene-1, octacene-1, and the like. Examples of the vinyl monomer include methyl, ethyl,
Acrylic or methacrylic acid esters such as propyl and butyl are exemplified. A specific example is ethylene /
Propylene copolymer, ethylene / butene-1 copolymer,
Ethylene / pentene-1 copolymer, ethylene / propylene / butene-1 copolymer, ethylene / propylene / dicyclopentadiene copolymer, ethylene / propylene / 5
-Ethylidene-2-norbornene copolymer, ethylene /
Propylene / dicyclopentadiene copolymer, ethylene / methyl acrylate copolymer, ethylene / ethyl acrylate copolymer, etc., among which ethylene / propylene copolymer, ethylene / butene-1 copolymer, ethylene / Methyl methacrylate copolymer and ethylene / ethyl acrylate copolymer can be preferably used, and one or more of them may be used in combination. Further, a modified copolymer obtained by a graft reaction of an epoxy compound, an acid anhydride, an imide, or the like is included.

The above-mentioned polyolefin copolymer is not an essential component, but is preferably contained when improvement in compatibility between polybutylene terephthalate and styrene resin and further improvement in impact strength are required. (A)
0 to 30 parts by weight, and further 1 to 3 parts by weight per 100 parts by weight
0 parts by weight, more preferably 5 to 25 parts by weight. If the amount is too large, the heat resistance inherent in PBT tends to be impaired.

The (D) organic bromine compound used in the present invention usually functions as a flame retardant, and specific examples thereof include brominated polycarbonate, brominated epoxy resin,
One or more organic bromine compounds such as brominated phenoxy resin, brominated polyphenylene ether resin, brominated polystyrene resin, brominated bisphenol A, and brominated polyphenylene phthalimide are exemplified.
2 to 60 parts by weight, and further 3 to 55 parts by weight with respect to 00 parts by weight.
A weight part is preferable, and when it is less than 2 weight parts, the effect of imparting flame retardancy is small, and when it exceeds 60 weight parts, the mechanical properties of the present invention tend to be impaired. In addition, U
In general, an amount for achieving V-0, V-1 or V-2 as the L94 standard is blended.

The (E) antimony compound used in the present invention can be used in combination with (C) an organic bromine compound.
Antimony compounds such as antimony trioxide, antimony pentoxide, sodium antimonate and antimony phosphate can be synergistically improved, and antimony compounds having been subjected to surface treatment are also used. it can. The amount of the antimony compound is
(A) For 100 parts by weight of thermoplastic polyester,
The range is preferably from 0.2 to 30 parts by weight, more preferably from 0.3 to 25 parts by weight. If less than 0.2 part by weight, there is no flame retardant effect, and if it exceeds 30 parts by weight, the mechanical properties of the present invention are impaired. Not preferred. As an example of combined use, antimony 1 in an antimony compound is used for 3 atoms of bromine in an organic bromine compound.
Examples of the mixing ratio close to the composition of atoms are given.

In the present invention, although not an essential component, (F) a fluorine resin can be blended. (F) Fluorine-based resin functions as a flame retardant aid, and is used in combination with (D) an organic bromine compound and (E) an antimony compound,
It is a flame-retardant aid with properties that can further improve flame retardancy. Specific examples of the fluorine-based resin include fluorine-substituted polyolefins such as polyvinyl fluoride, polyvinylidene fluoride, and polytetrafluoroethylene, and a fluorine-based resin subjected to a surface treatment or the like can also be used. Among them, polytetrafluoroethylene is preferably used,
The amount is preferably at least 50% by weight, more preferably at least 60% by weight of the fluororesin. The above polytetrafluoroethylene is manufactured by an emulsion polymerization method or a suspension polymerization method,
Those having a secondary particle diameter in the range of 100 to 1500 μm are preferred. The compounding amount of the fluororesin is preferably 0.1 to 5 parts by weight, and if it exceeds 5 parts by weight, the fluidity during molding is impaired, which is not preferable.

In the present invention, (G) a fibrous inorganic filler having a fiber diameter of 2 to 50 μm is blended. The fibrous inorganic filler is not particularly limited as long as it is generally used for reinforcing a resin. Examples of the fibrous inorganic filler include glass fiber, carbon fiber, and metal fiber. Among them, glass fiber is preferably used. The proportion of glass fibers in the fibrous inorganic filler is preferably at least 50% by weight, more preferably at least 80% by weight, further preferably at least 90% by weight. As the glass fiber, for example, a chopped strand of a long fiber type or a short fiber type can be used. Further, the glass fiber may be covered or bundled with a thermosetting resin such as a thermoplastic resin or an epoxy resin. The size of the fibrous inorganic filler is not particularly limited as long as it is generally used for resin reinforcement,
Fibers having a fiber diameter of 2 to 50 μm can be preferably used, and those which are usually surface-treated with aminosilane or epoxysilane exhibit more effects. In addition, the compounding amount of the fibrous inorganic filler having a fiber diameter of 2 to 50 μm is 2 to 170 parts by weight, and more preferably 3 to 170 parts by weight, per 100 parts by weight of the thermoplastic polyester (A).
A range of 130 parts by weight is preferred. If the amount is less than 2 parts by weight, the effect of improving mechanical properties is not sufficiently exhibited, which is not preferable.
If it exceeds 170 parts by weight, the moldability tends to be impaired.

In the present invention, (H) a plate-like inorganic filler is blended. Its average particle size is 300-3000 μm.
The average particle size as referred to herein means a weight average particle size measured by a particle size distribution, and the plate-like inorganic filler is not particularly limited as long as it is generally used for strengthening a resin. Metal foil is preferably used, and glass flake is particularly preferably used. The above-mentioned glass flakes are not particularly limited as long as they are generally used for reinforcing a resin, and may be coated or bundled with a thermosetting resin such as a thermoplastic resin or an epoxy resin, and surface-treated with an aminosilane or an epoxysilane. What has been used is also preferably used. The amount of the glass flakes in the plate-like inorganic filler is at least 50% by weight, more preferably at least 80% by weight,
Further, the range is preferably 90% by weight or more. The compounding amount of the (H) plate-like inorganic filler is 2 to 170 parts by weight, and more preferably 3 to 170 parts by weight, based on 100 parts by weight of the thermoplastic polyester (A).
A range of 130 parts by weight is preferred. If the amount is less than 2 parts by weight, the effect of improving mechanical properties is not sufficiently exhibited, which is not preferable.
If it exceeds 170 parts by weight, moldability tends to be impaired.

The fiber (G) of the present invention has a fiber diameter of 2 to 50 μm.
m, the combined ratio of the fibrous inorganic filler and the (H) plate-like inorganic filler is such that the amount of the component (H) is 0.25 with respect to the amount of the component (G).
The function is further improved by using in the range of up to 4 times, and further in the range of 0.3 to 3.5 times. When the amount is less than 0.25 times, the anisotropy of the reinforced flame-retardant polyester composition becomes large, and when it exceeds 4 times, the effect of improving the mechanical properties tends not to be sufficiently exhibited.

In the composition of the present invention, besides the fillers specifically exemplified above, ceramic fibers, ceramic beads, ceramic fibers, ceramic beads, and the like belonging to the component (G) or the component (H) or not. Asbestos, wollastonite, talc, clay, mica, sericite, zeolite, bentonite, dolomite, kaolin, fine silica, feldspar powder, potassium titanate, shirasu balloon,
Fillers such as calcium carbonate, magnesium carbonate, barium sulfate, calcium oxide, aluminum oxide, titanium oxide, aluminum silicate, silicon oxide, gypsum, novacurite, dawsonite and clay may be incorporated.

Further, the composition of the present invention comprises an antioxidant, an ultraviolet absorber, a heat stabilizer, a nucleating agent, a lubricant, a release agent,
Colorants, including dyes and pigments, nucleating agents, other thermoplastics (eg, polyethylene, acrylics, polyamides,
At least one of polyphenylene sulfide resin, polyether ether ketone resin, liquid crystal polyester resin, polyacetal, polysulfone, polyphenylene oxide, and the like; and thermosetting resin (for example, phenol resin, melamine resin, polyester resin, silicone resin, epoxy resin, etc.) The above can be further contained.

The method for producing the composition of the present invention is not particularly limited, but includes, for example, polybutylene terephthalate, a styrene resin, a polyolefin copolymer if necessary, and another thermoplastic resin ester if necessary. After previously blending an organic bromine compound, an antimony compound, a fluororesin, and other additives as necessary, the mixture is supplied to a hopper of a twin-screw extruder having one or more zones of a kneading block at a temperature equal to or higher than the melting point of polybutylene terephthalate. A method of supplying a fibrous inorganic filler having a fiber diameter of 2 to 50 μm and a plate-like inorganic filler having an average particle diameter of 300 to 3000 μm to an extruder from a side feeder and uniformly melting and kneading the mixture, or After blending, the screw shape is not particularly limited above the melting point of polybutylene terephthalate. However, for example, a method in which the mixture is supplied to a hopper of a single-screw extruder into which a dalmage screw is inserted and melt-kneaded uniformly is preferably used.

The obtained reinforced polyester resin composition comprises:
Molding can be performed by any known method such as injection molding and extrusion molding.

The molded product obtained from the composition of the present invention has good mechanical properties, and particularly, the molded product obtained by injection molding has extremely small anisotropy and is provided with flame retardancy. As a molding material from which a lightweight molded article with little warpage can be obtained stably, it can be used for applications such as electric / electronic connector parts, precision parts such as automobile parts and machine parts.

[0036]

The present invention will be described in more detail with reference to the following examples. All copies in the examples are on a weight basis. Table 1 shows the contents of the blended compositions used in the examples.

[0037]

[Table 1] <Manufacturing method of reinforced polyester resin composition> Two zones of kneading block between the base part and side feeder of TEX44 twin screw extruder manufactured by Nippon Steel Works, kneading between side feeder and die as discharge port After incorporating the block into one zone and setting the processing temperature to 260 ° C., the hopper in the filling section is made of polybutylene terephthalate having an intrinsic viscosity of 0.92, thermoplastic polyester resin, ABS resin, ethylene / ethyl acrylate copolymer, etc. A blend containing a polyolefin copolymer, an organic bromine compound, an antimony compound, a fluororesin, etc. is supplied, glass fibers and glass flakes are supplied from a side feeder, melt-kneaded, and the strand discharged from the die is cooled in a cooling bath. And pelletized with a strand cutter.

<Method of Evaluating Molded Article of Reinforced Polyester Resin Composition> Using the pellets obtained by the above twin screw extruder, a processing temperature of 250 ° C., a mold temperature of 80 ° C., a molding cycle (injection time / cooling time) / Intermediate time) 1 in 8/10/5 seconds
/ 8 "thick tensile test piece and Izod test piece are injection molded and subjected to a tensile test according to ASTM D638, ASTM D2
An Izod impact test was performed according to No. 65 to evaluate mechanical properties.

From another pellet, a thickness of 1 mm and a length of 8 mm
A 0 mm x 80 mm square plate is injection-molded with a film gate mold, and the molding shrinkage in the flow direction and the direction perpendicular to the flow is measured by a universal projector. It is determined that the larger the material, the greater the anisotropy.

The above-mentioned 1 mm thick, 80 mm long, 80 mm wide square plate is passed through a 50 mm long metal jig having a space of 80 mm width and 1.35 mm height, but does not pass through the jig. Is treated as a defective product.
The pieces were passed and the defective rate was calculated. This test is a useful test method for judging warpage, and a square plate with little warpage passes through the above jig. .

Further, a flame retardancy test was conducted in accordance with UL94, and the flame retardancy rank was determined. The criteria for the above-mentioned flame retardancy rank are non-standard, UL94HB, UL94V
-2, UL94V-1 and UL94V-0, and electrical components such as connectors are UL94V-2.
Materials having flame retardancy of ~ V-0 are required.

Examples 1 to 14 and Comparative Examples 1 to 9 In accordance with the above-mentioned method for producing a reinforced flame-retardant polyester resin composition, reinforcement of Examples 1 to 14 and Comparative Examples 1 to 9 having the composition shown in Tables 2 to 4 was carried out. A polyester resin composition was obtained. Further, according to the evaluation method of the molded article of the reinforced polyester resin composition,
The molded articles of the reinforced polyester resin compositions of Examples 1 to 14 and Comparative Examples 1 to 9 were evaluated, and the obtained evaluation results are shown in Tables 2 to 4 in the same manner as the composition.

[0043]

[Table 2]

[0044]

[Table 3]

[0045]

[Table 4]

From the results of the Examples and Comparative Examples in Tables 2 to 4, the polybutylene terephthalate of the present invention was added to a styrene resin,
If necessary, polyolefin copolymer, organic bromine compound, antimony compound, fluorine compound as required, fibrous inorganic filler having a fiber diameter of 2 to 50 μm, and an average diameter of 30
The reinforced flame-retardant polyester resin composition comprising a plate-like inorganic filler having a particle size of 0 to 3000 μm has good mechanical properties and extremely low anisotropy as compared with the comparative example, and is imparted with flame retardancy. It can be seen that a small and lightweight molded product can be stably obtained.

[0047]

Industrial Applicability The reinforced flame-retardant polyester resin composition of the present invention has good mechanical properties, extremely small anisotropy of a molded article, flame retardancy, light weight and little warpage, and therefore, dimensional accuracy. It is useful for electrical and electronic parts such as connectors with strict requirements and precision molded parts.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location C08L 25:04 23:00)

Claims (10)

[Claims] 1 to 100 parts by weight of a thermoplastic polyester resin containing (A) polybutylene terephthalate as an essential component, and (B) 2 to 95 parts by weight of a styrene resin.
(C) 0-30 parts by weight of polyolefin copolymer, (D)
2 to 60 parts by weight of an organic bromine compound, 0.2 to 30 parts by weight of an (E) antimony compound, 0 to 5 parts by weight of a (F) fluororesin, (G) a fibrous inorganic filler 2 to 2 to 50 μm in fiber diameter
170 parts by weight and (H) 2 to 170 parts by weight of the plate-like inorganic material, and the amount of the component (G) is 0.25 to 4% of the component (H).
(H) the average particle diameter of the plate-like inorganic material is 30
A reinforced polyester resin composition having a thickness of 0 to 3000 µm. 2. The method according to claim 1, wherein (B) the styrene resin is ABS or AS.
The reinforced polyester resin composition according to claim 1, comprising a resin as an essential component, and a molded article thereof. 3. The reinforced polyester resin composition according to claim 1, wherein (B) the styrene resin contains HI-polystyrene or a polystyrene resin as an essential component. 4. The reinforced polyester resin composition according to claim 1, wherein (B) the styrene resin contains a hydrogenated and / or unhydrogenated styrene / diene / styrene block copolymer as an essential component. 5. The reinforced polyester resin composition according to claim 1, wherein (F) the fluororesin contains polytetrafluoroethylene as an essential component. 6. The reinforced flame-retardant polyester resin according to claim 1, wherein (G) the fibrous inorganic filler having a fiber diameter of 2 to 50 μm contains at least one of glass fiber and carbon fiber as an essential component. Composition. 7. The reinforced flame-retardant polyester resin composition according to claim 1, wherein (H) the plate-like inorganic substance contains glass flake as an essential component. 8. The reinforced polyester resin composition according to claim 1, wherein the component (A) contains polycyclohexane dimethylene terephthalate as an essential component. 9. The reinforced polyester resin composition according to claim 1, wherein the component (A) contains polyethylene terephthalate as an essential component. 10. A molded article obtained by injection molding the reinforced polyester resin composition according to claim 1.