JP2004204170A - Polybutylene terephthalate resin composition and molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a polybutylene terephthalate resin composition with excellent moldability and mold releasability, which gives a molding exhibiting very good appearance and paintability in addition to high rigidity. <P>SOLUTION: The polybutylene terephthalate resin composition is obtained by formulating 40-150 pts.wt. of mixed fillers ((C) + (D)) comprising (C) a glass fiber and (D) one or more fillers selected from (D-1) an acicular filler having 40-200μm average fiber length and (D-2) a granular or platy filler having 5-60μm particle size, and (E) 0.1-5 pts.wt. of an ester compound comprising a ≥26C aliphatic carboxylic acid as a main constituent to 100 pts.wt. of a resin component comprising (A) 95-55 wt.% of a modified polybutylene terephthalate resin containing 5-30 mol% isophthalic acid unit and having 0.60-0.80 intrinsic viscosity (IV) and (B) 5-45 wt.% of a polycarbonate resin. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【００６１】
【表２】

【００６２】
【発明の効果】
以上述べたように本発明のポリブチレンテレフタレート樹脂組成物は特定組成の共重合ポリブチレンテレフタレートにポリカーボネート樹脂をブレンドし、更に特定充填剤を添加することにより、高い機械強度、剛性を有し、良好な成形性、離型性、塗装性を有しながら、非常に優れた成形品外観を示す。この組成物によって得られる成形品は特に高強度かつ良好な外観が要望される自動車・電機および建材等の内外装部品に応用される。
【図面の簡単な説明】
【図１】図１は実施例において表面外観の評価に用いたモデル試験金型の形状を示す図である。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a polybutylene terephthalate resin composition and a molded product obtained by molding the same. More specifically, the present invention relates to a polybutylene terephthalate resin composition having not only high rigidity but also a molded article having a very good appearance, and further having excellent moldability, mold release properties and coatability.
[0002]
INDUSTRIAL APPLICABILITY The resin composition of the present invention is suitably used for interior and exterior parts requiring high rigidity in the fields of automobiles, architecture, electric / electronic devices and other various industries, particularly automobiles requiring high rigidity and good appearance. It is suitably used for stays, outer handles, wiper parts and the like for door mirrors or inner mirrors as interior and exterior parts.
[0003]
Problems to be solved by the prior art and the invention
Crystalline thermoplastic polyester resins, such as polyalkylene terephthalate resins, are excellent in mechanical properties, electrical properties, and other physical and chemical properties, and have good workability. It is used for a wide range of applications such as parts.
[0004]
Such a crystalline thermoplastic polyester resin is used alone in various molded articles, but depending on the application field, various reinforcing agents and additives may be blended for the purpose of improving its properties, particularly mechanical properties. Has been done. In fields requiring high mechanical strength and rigidity, it is well known to use a fibrous reinforcing agent represented by glass fiber, carbon fiber and the like.
[0005]
However, the crystalline thermoplastic polyester resin containing a fibrous reinforcing agent, although the mechanical strength, rigidity, etc. are certainly improved, the surface appearance of the obtained molded product is raised by the reinforcing filler itself, or the reinforcing filler is It may be defective due to a flow mark or the like due to a decrease in fluidity, and it is difficult to obtain a good appearance.
[0006]
In particular, when a polymer having high crystallinity, such as polybutylene terephthalate, is used, it is difficult to obtain a satisfactory appearance because the crystallization during molding causes poor transferability to a mold.
[0007]
In addition, as the shape of the molded product becomes complicated for design and functional purposes, a molded product having ribs and bosses is practically used instead of a simple flat plate shape. A portion corresponding to the back side of the boss is liable to cause poor appearance such as sink marks due to the amount of resin shrinkage or orientation of the reinforcing filler, and it is difficult to obtain a satisfactory appearance.
[0008]
As a method for solving these problems, it has been proposed to mix a different polymer such as polyethylene terephthalate (Patent Document 1) or polycarbonate (Patent Document 2) with a reinforced polybutylene terephthalate resin.
[0009]
However, in the method of blending polyethylene terephthalate disclosed in Patent Document 1, although the gloss is improved, the improvement of glass fiber floating and sink is insufficient, and the moldability such as generation of burrs deteriorates, and post-processing is required. There are defects and delays in the molding cycle, causing problems in practicality. In addition, although the level of sink marks is not bad for a thin molded piece, there is a problem that large-sized practical parts have insufficient fluidity to improve sink marks.
[0010]
In the composition obtained by blending polycarbonate, a crystallization nucleating agent, and the like with the modified polybutylene terephthalate of Patent Document 2, it is possible to balance relatively good appearance, sink mark, and moldability. Improvement in moldability (particularly mold release property) has been desired.
[0011]
Further, in order to solve the problem of surface appearance, a method of adding a fine powder filler such as talc and calcium carbonate is known, but such a fine powder filler has high mechanical strength and rigidity. I can't get it.
[0012]
On the other hand, in order to achieve a remarkable balance between good gloss and impact resistance in automotive outer panel applications, polyalkylene terephthalate or aromatic polycarbonate may be blended with needle-shaped fine particulate inorganic additives having a specific shape. Although proposed (Patent Literature 3), suitable mechanical strength and rigidity as structural members were not obtained, and the level of improvement in sink marks, moldability, and the like was also insufficient.
[0013]
Furthermore, in part molding in this field, in order to obtain a good appearance, a method of increasing the resin temperature and improving the fluidity of the composition, or increasing the mold temperature to reduce the crystallization rate and improve the transferability Although such a method is generally used, there is a limit to such improvement in the molding surface, and if the resin temperature is forcibly increased, the resin is thermally decomposed, generating gas and contaminating the mold. In addition, there is a problem that the molding cycle time is increased by increasing the mold temperature, and mass productivity is impaired. Further, in order to improve the moldability, it is generally known to use an ester compound or a wax as a release agent. There were restrictions on the use of.
[0014]
Therefore, development of a material having high mechanical strength and rigidity, having a good appearance, good releasability, and excellent coating properties has been desired.
[0015]
[Patent Document 1]
JP-A-8-120166 [Patent Document 2]
JP-A-9-291204 [Patent Document 3]
JP-A-7-149948
[Means for Solving the Problems]
In view of the above problems, the present inventors have made intensive studies on polybutylene terephthalate resin compositions to which a reinforcing filler has been added in order to obtain excellent surface appearance and moldability. As a result, by using a specific modified polybutylene terephthalate copolymer together with a polycarbonate resin, and using a specific reinforcing filler and a release agent together, a molded article obtained while blending a large amount of inorganic fillers The present inventors have found that the surface of the filler is hardly noticeable, has a very good appearance, and has excellent moldability and coatability, thereby completing the present invention.
[0017]
That is, the present invention
(A) 95 to 55% by weight of a modified polybutylene terephthalate resin having an intrinsic viscosity (IV) of 0.60 to 0.80 containing 5 to 30 mol% of an isophthalic acid unit;
(B) 100 parts by weight of a resin component comprising 5 to 45% by weight of a polycarbonate resin,
(C) glass fiber,
(D) Mixed filling comprising needle-like filler (D-1) having an average fiber length of 40 to 200 μm and one or more particles or plate-like fillers (D-2) having a particle diameter of 5 to 60 μm. Agent ((C) + (D)) 40-150 parts by weight and
(E) A polybutylene terephthalate resin composition containing 0.1 to 5 parts by weight of an ester compound containing an aliphatic carboxylic acid having 26 or more carbon atoms as a main component.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the components of the resin material of the present invention will be described in detail.
[0019]
First, the modified polybutylene terephthalate resin (A), which is a base resin of the resin material of the present invention, is obtained by a polycondensation reaction between terephthalic acid or an ester-forming derivative thereof and an alkylene glycol having 4 carbon atoms or an ester-forming derivative thereof. Is a copolymer having polybutylene terephthalate as a main component and 5 to 30 mol% of isophthalic acid introduced therein as a comonomer unit. Isophthalic acid is used for the polycondensation in the form of an ester-forming derivative, for example a lower alcohol ester such as a dimethyl ester, and can also be introduced as a copolymer component.
[0020]
Here, the introduction amount of the isophthalic acid comonomer unit is 5 to 30 mol%, preferably 10 to 30 mol%, particularly preferably 10 to 20 mol%. When the amount is less than 5 mol%, the crystallinity is high, so that the transferability to a mold is poor, and it is difficult to obtain a sufficient appearance. If the amount exceeds 30 mol%, the strength and thermal stability, which are the advantages of the original polybutylene terephthalate, are greatly reduced, and the crystallization is significantly reduced and delayed. This causes a reduction in moldability and causes a problem that is not practically used.
[0021]
The modified polybutylene terephthalate resin used in the present invention has an intrinsic viscosity (IV) measured at 25 ° C. of 0.60 to 0.80 (dl / g), preferably 0.60 to 0.70, using o-chlorophenol as a solvent. This is very important. When the IV value is smaller than 0.60, the toughness is remarkably reduced, which is not preferable. On the other hand, when the IV value is larger than 0.80, the fluidity is lowered and a good appearance cannot be obtained, which is not preferable.
[0022]
Further, in the present invention, a resin obtained by adding a small amount of an unmodified polybutylene terephthalate resin to the above-mentioned modified polybutylene terephthalate resin may be used as the component (A) for the purpose of improving the releasability and shortening the molding cycle. The addition amount of the unmodified polybutylene terephthalate resin is preferably 0 to 15% by weight based on the total weight of the modified and unmodified polybutylene terephthalate resin, and the amount of the isophthalic acid unit contained in the modified polybutylene terephthalate resin is 5%. Unmodified polybutylene terephthalate resin having any viscosity can be used as long as the polybutylene terephthalate resin has an IV value of 0.60 to 0.80 after addition. Although the IV value changes depending on the extrusion and molding conditions, there is no particular problem as the present composition as long as the IV value of the molded product is within the above range.
[0023]
Next, in the present invention, (B) a polycarbonate resin is added.
[0024]
Polycarbonate resin is a solvent method, that is, in a solvent such as methylene chloride, a known acid acceptor, in the presence of a molecular weight modifier, the reaction of a dihydric phenol with a carbonate precursor such as phosgene or dihydric phenol and diphenyl carbonate And a transesterification reaction with a carbonate precursor such as Here, bisphenols are preferably used as the dihydric phenol, and 2,2-bis (4-hydroxyphenyl) propane, that is, bisphenol A is particularly preferable. Further, bisphenol A may be obtained by partially or entirely substituting another dihydric phenol. Examples of dihydric phenols other than bisphenol A include hydroquinone, 4,4-dihydroxydiphenyl, bis (4-hydroxyphenyl) alkane, bis (4-hydroxyphenyl) cycloalkane, bis (4-hydroxyphenyl) sulfide, bis ( Compounds such as 4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) sulfoxide, bis (4-hydroxyphenyl) ether or bis (3,5-dibromo-4-hydroxyphenyl) propane, bis (3,5- Halogenated bisphenols such as dichloro-4-hydroxyphenyl) propane can be mentioned. These dihydric phenols may be homopolymers or copolymers of two or more dihydric phenols. Further, the polycarbonate resin used in the present invention may be a thermoplastic random branched polycarbonate obtained by reacting a polyfunctional aromatic compound with a dihydric phenol and / or a carbonate precursor.
[0025]
The polycarbonate used in the present invention is preferably one having high fluidity, and a polycarbonate having a melt viscosity (300 ° C., shear rate 1000 sec ⁻¹ ) in the range of 0.20 to 0.50 kPa · sec is preferably used, and more preferably 0.20 to 0.30 kPa. -It is for sec.
If the melt viscosity of the polycarbonate is less than 0.20, the physical properties are significantly reduced, and if it exceeds 0.50, the fluidity is greatly reduced, which is not preferable.
[0026]
The amount of the polycarbonate (B) added is 5 to 45% by weight, preferably 10 to 40% by weight, based on the total of the components (A) and (B). If the amount is too small, the good appearance (especially sink mark) of the molded article intended for the present invention is inferior. If the amount is too large, molding problems such as an increase in molding cycle and deterioration in mold release properties are undesirable.
[0027]
Even if the modified polybutylene terephthalate copolymer is used alone, the appearance is improved to some extent, but the effect is not sufficient, and the strength and thermal stability are greatly reduced, and the effect of adding the toughening agent is reduced. Decrease. Although the effect of improving the appearance is also observed when a polycarbonate resin is added to an unmodified polybutylene terephthalate resin, the effect is not sufficient, and when a large amount of an inorganic filler is added, the filler emerges on the surface. It is difficult to control.
[0028]
Next, the mixed filler ((C) + (D)) used in the present invention is composed of a glass fiber (C), an acicular filler (D-1) having an average fiber length of 40 to 200 μm, and a particle diameter of 5 to 5 μm. A mixture with one or more fillers selected from 60μm particulate or platy filler (D-2) to obtain molded products with excellent performance such as mechanical strength, rigidity, heat resistance, and electrical properties. It is an essential component. When the fibrous filler alone is used as the reinforcing filler, the mechanical properties are good, but the fine irregular appearance is conspicuous and is not preferable in appearance. Further, when other particulate or plate-like fillers are used alone, the mechanical properties are lowered, and a large amount of the fillers causes the flowability to be lowered.
[0029]
As the glass fiber (C), A glass, E glass, an alkali-resistant glass composition containing a zirconia component, a chopped strand, a glass fiber at the time of blending roving glass, etc. Can be used.
[0030]
As a particularly typical glass fiber, an E glass glass fiber having a fiber diameter of 5 to 18 μm is preferably used, and an E glass glass fiber having a fiber diameter of 9 to 14 μm is particularly preferable.
[0031]
Next, the needle-like filler (D-1) is preferably calcium silicate having an average fiber length of 40 to 200 μm, preferably 60 to 180 μm, particularly preferably 80 to 180 μm, and an average fiber diameter of 6 to 14 μm. Are listed.
[0032]
As the particulate or plate-like filler (D-2), mica having a particle size of 5 to 60 μm, preferably 10 to 55 μm, and an aspect ratio of 20 to 50, such as phlogovite or mascot bite, has high mechanical properties. It is preferably used in order to obtain a good appearance after holding.
[0033]
The mixing amount of the filler (C) + (D) is 40 to 150 parts by weight, preferably 60 to 150 parts by weight, based on 100 parts by weight of the total of the resin components (A) and (B). Department. Particularly preferably, the component (C) is 50 to 120 parts by weight and the component (D-1) and / or (D-2) is 5 to 30 parts by weight.
[0034]
If the amount of the component (C) + (D) is too small, the appearance is good, but the mechanical strength and rigidity (flexural modulus) are low, and the product is not practical. Also, if it is excessive, the mechanical strength is reduced due to the decrease in toughness, and the flowability and transferability to the mold are deteriorated, the filler is floated, etc., and the appearance of the molded product is significantly deteriorated. Not preferred.
[0035]
When using these fillers, it is desirable to use a sizing agent or a surface treatment agent if necessary. If this example is shown, all functional compounds, such as an epoxy compound, an acrylic compound, an isocyanate compound, a silane compound and a titanate compound, are preferably used. These compounds may be used after being subjected to a surface treatment or a convergence treatment in advance, or may be added simultaneously with the preparation of the material. The amount of the functional surface treating agent used in combination is 0 to 10% by weight, preferably 0.05 to 5% by weight, based on the filler.
[0036]
Next, (E) an ester compound having an aliphatic carboxylic acid having 26 or more carbon atoms as a main component is preferably an ester of an aliphatic carboxylic acid having 26 or more carbon atoms and a monohydric or polyhydric alcohol. Used.
[0037]
When an ester compound containing a fatty acid having less than 26 carbon atoms as a component is used, the releasability is good, but the coating property is undesirably reduced due to the influence of seepage on the molded product surface.
[0038]
Particularly preferred are fatty acid esters containing at least 70% by weight of montanic acid esters, such as esters of montanic acid and monohydric aliphatic alcohols having 18 to 36 carbon atoms, and partial esters and / or fullerenes of montanic acid and ethylene glycol and glycerin. Esters and the like are used.
[0039]
The compounding amount of the ester compound as the component (E) is 0.1 to 5 parts by weight, preferably 0.3 to 3 parts by weight, particularly preferably 0.3 to 3 parts by weight, based on a total of 100 parts by weight of the resin component comprising the components (A) and (B). It is 0.5 to 2 parts by weight.
[0040]
Further, in order to impart desired properties according to the purpose, a known substance generally added to a thermoplastic resin or the like can be further added to the composition of the present invention.
For example, stabilizers such as antioxidants, ultraviolet absorbers, and light stabilizers, antistatic agents, lubricants, mold release agents, crystallization nucleating agents, coloring agents such as dyes and pigments, lubricants, and plasticizers are compounded. It is possible. In particular, antioxidants are effective for improving the thermal stability of the composition of the present invention, and specifically, compounds such as hindered phenol, amine, phosphorus, and thioether compounds can be used.
[0041]
Among them, one or more of a hindered phenol compound and a phosphorus compound are effective in combination.
[0042]
In particular, the addition of a phosphorus-based stabilizer is highly effective in suppressing the transesterification between the (A) modified polybutylene terephthalate resin and (B) the polycarbonate resin, and the resulting composition exhibits higher thermal stability.
[0043]
The amount of the antioxidant used here is 0.01 to 5 parts by weight, preferably 0.05 to 3 parts by weight per 100 parts by weight of the total of (A) the modified polybutylene terephthalate resin and (B) the polycarbonate resin. .
[0044]
Further, for the purpose of improving the moldability, a known inorganic crystal nucleating agent such as boron nitride and talc, and a known organic crystal nucleating agent such as a rosin acid derivative and an ester metal salt can be used. Preferably, 0.01 to 2 parts by weight per 100 parts by weight of the total of (A) the modified polybutylene terephthalate resin and (B) the polycarbonate resin is blended.
[0045]
Such known substances may be used alone or in combination of two or more.
[0046]
Further, other thermoplastic resins (for example, acrylic resin, fluororesin, polyamide, polyacetal, polysulfone, polyphenylene oxide, etc.) and thermosetting resins (for example, phenolic resin, melamine resin, etc.) as a resin component within a range not to impair the object of the present invention. , Polyester resins, silicone resins, epoxy resins, etc.) and soft thermoplastic resins (eg, ethylene / ethyl acrylate, ethylene / vinyl acetate copolymer, polyester elastomer, etc.), and only one of these resins can be used. Alternatively, two or more kinds may be used in combination.
[0047]
The composition of the present invention can be easily prepared by equipment and methods generally used as a conventional method for preparing a resin composition. For example, after mixing the respective components, kneading and extruding with a single-screw or twin-screw extruder to prepare pellets, and then molding, pellets having a different composition are prepared once, and the pellets are mixed in a predetermined amount. Any method can be used, such as a method of providing a molded article having a desired composition after molding and a method of directly charging one or more of each component to a molding machine. Further, mixing and adding a part of the resin component as a fine powder with other components is a preferable method for uniformly mixing these components.
[0048]
As a molding method for filling a resin into a mold, there are an injection molding method, an extrusion compression molding method and the like, and an injection molding method is generally used.
[0049]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited thereto.
[0050]
In addition, the measuring method of the physical property evaluation shown in the following examples is as follows.
(1) Physical properties a. Fluidity The melt viscosity measured using a Toyo Seiki Seisakusho Capillograph was evaluated as fluidity. Detailed conditions are as follows.
[0051]
Measurement point; SR = 1000
Temperature: 260 ° C
Capillary; diameter φ1.0
Length: 20mm
b. The tensile strength was measured according to ISO-527 (test piece ISO type type; thickness 4 mm).
c. Flexural strength / modulus Measured according to ISO-178.
[0052]
The appearance and formability were measured by the following methods.
(2) Surface appearance The surface condition of a sample molded under the following conditions using a model test mold (automobile outdoor handle escutcheon) shown in FIG. 1 was observed and evaluated.
[0053]
Molding machine SG-150U SYCAP-MIV manufactured by Sumitomo Heavy Industries, Ltd.
(Molding condition)
Cylinder temperature (° C) Nozzle 265-265-265-250
Injection pressure 80MPa
Injection speed 35mm / sec
Mold temperature 95 ℃
a. Surface appearance-1
The surface condition of the molded sample was visually observed, the state of the filler protruding from the surface was evaluated, and the following scores were given.
[0054]
5: no filler floating on the entire surface, showing a uniform surface 4; filler floating only slightly on part of the surface 3; filler floating on part of the surface 2: surface The floating of the filler is frequently observed in several places 1; The floating of the filler is strongly observed on the entire surface b. Surface appearance-2
The state of the sink level at the back of the boss of the molded sample was visually observed and evaluated by a contour shape measuring device (SV600 manufactured by Mitutoyo Corporation), and the following scores were given.
[0055]
5: No sink mark was seen on the surface, and the sink mark level was almost 0 μm. 4; Slight sink mark was seen on the surface, and sink mark was 5 μm or less. 3: Some sink marks were seen on the surface, and the sink level was low. 5 to 10 μm 2; sink mark is observed on the surface and sink mark level is 10 to 20 μm 1; large sink mark is observed on the surface and sink mark level is 20 μm or more c. Surface appearance-3
The surface state of the molded sample was visually observed, and the surface citron skin (orange skin) state was evaluated, and the following points were given.
[0056]
5: The entire surface is smooth and uniform 4; Slightly fine irregularities are seen on the surface 3; Some irregularities are seen on the surface 2; Large irregularities are seen on the surface 1; Large irregularities are seen on the surface (3) Formability Using a model test mold (automobile outdoor handle escutcheon) shown in FIG. 1, after stable molding under the following basic conditions, shorten the cooling time and evaluate the continuous moldability. did.
[0057]
Molding machine SG-150U SYCAP-MIV manufactured by Sumitomo Heavy Industries, Ltd.
(Basic molding conditions)
Cylinder temperature (° C) Nozzle 265-265-265-250
Injection pressure 80MPa
Injection speed 35mm / sec
Mold temperature 95 ℃
Molding cycle: Injection / holding time 12sec, cooling time 23sec, intermediate time 15sec
a. Moldability-1 (Molding cycle)
After the molding is stabilized under the above basic molding conditions, the cooling time is gradually reduced, and the continuous moldability at each time is examined. The minimum cooling time during which the sprue and runner do not break when the mold is opened is defined as the limit molding cycle.
b. Moldability-2 (Releaseability)
After the molding is stabilized under the above basic molding conditions, the releasability of the molded article when the cooling time is gradually reduced is examined. The shortest cooling time during which no protrusion pin marks are generated at the time of release is defined as the release property.
(4) Coatability A two-part urethane paint (Rethane PG60) manufactured by Kansai Paint Co., Ltd., which is molded under the following conditions and coated under the following conditions, is coated and dried. A grid test was performed in accordance with K5400 to evaluate the coatability.
[0058]
Molding machine SG-150U SYCAP-MIV manufactured by Sumitomo Heavy Industries, Ltd.
(Basic molding conditions)
Cylinder temperature (° C) Nozzle 265-265-265-250
Injection pressure 80MPa
Injection speed 35mm / sec
Mold temperature 95 ℃
Molding cycle: Injection / holding time 15sec, cooling time 20sec, intermediate time 15sec
Examples 1 to 11, Comparative Examples 1 to 14
The components shown in Tables 1 and 2 were supplied to a twin screw extruder (TEX30 manufactured by Nippon Steel) at the ratios shown in Tables 1 and 2, melt-kneaded at a cylinder temperature of 260 ° C., and pelletized. The above various evaluations were performed using the obtained pellet-shaped polyester resin composition. The results are shown in Tables 1 and 2.
[0059]
The details of each component used in Examples and Comparative Examples are as follows.
(A) Modified polybutylene terephthalate resin
(A-1): a polybutylene terephthalate copolymer modified by copolymerizing 12.5 mol% of dimethyl isophthalate (IV = 0.65); 200JP, manufactured by Wintech Polymer Co., Ltd.
(A-2); a polybutylene terephthalate copolymer modified by copolymerizing 12.5 mol% of dimethyl isophthalate (IV = 0.85); using the above (A-1) at 170 ° C. × 40 IV adjusted by performing solid phase polymerization for a long time
(A-0); unmodified polybutylene terephthalate resin (IV = 0.65); 200FP manufactured by Wintech Polymer Co., Ltd.
(B) Polycarbonate resin Iupilon H-3000 manufactured by Mitsubishi Engineering-Plastics Corporation
(C), (D) Filler ・ (C) Glass fiber Nitto Boseki Co., Ltd., CS3PE941, average fiber diameter 13μm
・ (D-1) Needle filler
(D-1-1) Wollastonite, NYCO Minerals, Inc NAGLOS8 (average fiber diameter 8μm, average fiber length 136μm, aspect ratio 17)
(D-1-2) Wollastonite, NYCO Minerals, Inc NAGLOS12 (average fiber diameter 12μm, average fiber length 156μm, aspect ratio 13)
(D'-1-1) Wollastonite, NYCO Minerals, Inc NAGLOS4 (average fiber diameter 4 μm, average fiber length 32 μm, aspect ratio 8)
(D'-1-2) Wollastonite, NYCO Minerals, Inc NYAD G (average fiber diameter 40μm, average fiber length 600μm, aspect ratio 15)
・ (D-2) Particulate / plate filler
(D-2-1) Frogobite, Repco Corporation, S-325 (Average diameter 27μm, aspect ratio 30)
(D-2-2) Maskovite, Repco Corporation, M-200W (average diameter 50μm, aspect ratio 40)
(D-2-3) Maskovite, Repco Co., Ltd., M-325W (average diameter 27 μm, aspect ratio 40)
(D'-2-1) Maskovite, Mica Yamaguchi Mfg. Co., Ltd., mica powder A-11 (average diameter 2-3 μm)
(D'-2-2) Maskovite, Repco Co., Ltd., M-100W (average diameter 65μm, aspect ratio 50)
(E) Ester compound
(E-1) Montanic acid ester wax, Clariant Japan KK, Luzawax-EP, Recolub WE1
(E-2) Montanic acid ester wax, Hoechst Industry Co., Ltd., Kolb WE4
(E'-1) Sorbitan fatty acid ester, RIKEN VITAMIN CO., LTD., LIQUEMAL B-150
(E'-2) pentaerythritol tetrastearate, NOF Corporation, Unistar H-476
[0060]
[Table 1]

[0061]
[Table 2]

[0062]
【The invention's effect】
As described above, the polybutylene terephthalate resin composition of the present invention has high mechanical strength and rigidity by blending a polycarbonate resin with copolymerized polybutylene terephthalate of a specific composition and further adding a specific filler. While having excellent moldability, mold release properties, and paintability, it shows a very excellent molded product appearance. Molded articles obtained from this composition are particularly applied to interior and exterior parts such as automobiles / electric machines and building materials that require high strength and good appearance.
[Brief description of the drawings]
FIG. 1 is a view showing the shape of a model test mold used for evaluating the surface appearance in Examples.

Claims (5)

(A) 95 to 55% by weight of a modified polybutylene terephthalate resin having an intrinsic viscosity (IV) of 0.60 to 0.80 containing 5 to 30 mol% of an isophthalic acid unit;
(B) 100 parts by weight of a resin component comprising 5 to 45% by weight of a polycarbonate resin,
(C) glass fiber,
(D) Mixed filling consisting of acicular filler (D-1) having an average fiber length of 40 to 200 μm and one or more selected from particulate or plate-like fillers (D-2) having a particle diameter of 5 to 60 μm. Agent ((C) + (D)) 40-150 parts by weight and
(E) A polybutylene terephthalate resin composition containing 0.1 to 5 parts by weight of an ester compound containing an aliphatic carboxylic acid having 26 or more carbon atoms as a main component. (D-1) The polybutylene terephthalate resin composition according to claim 1, wherein the acicular filler is calcium silicate. (D-2) The polybutylene terephthalate resin composition according to claim 1 or 2, wherein the particulate or plate-like filler is phlogovite or mascotite. The polybutylene terephthalate resin composition according to any one of claims 1 to 3, wherein the (E) ester compound is a fatty acid ester containing at least 70% by weight of a montanic acid ester. A molded article, which is an automotive decorative part selected from a stay for a door mirror or an inner mirror, an outer handle, and a wiper part, obtained by molding the polybutylene terephthalate resin composition according to any one of claims 1 to 4.

Images