JP5300155B2 - Glass fiber reinforced thermoplastic polyester resin composition and molded article thereof - Google Patents
Glass fiber reinforced thermoplastic polyester resin composition and molded article thereof Download PDFInfo
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- JP5300155B2 JP5300155B2 JP2010213056A JP2010213056A JP5300155B2 JP 5300155 B2 JP5300155 B2 JP 5300155B2 JP 2010213056 A JP2010213056 A JP 2010213056A JP 2010213056 A JP2010213056 A JP 2010213056A JP 5300155 B2 JP5300155 B2 JP 5300155B2
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Abstract
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本発明は、流動性および成形性に優れ、かつ強度・剛性が高く、表面光沢性に優れたガラス繊維強化熱可塑性ポリエステル樹脂組成物に関する。 The present invention relates to a glass fiber reinforced thermoplastic polyester resin composition having excellent fluidity and moldability, high strength and rigidity, and excellent surface gloss.
従来、高強度・高剛性および良外観が要求されるような自動車構造部品、例えばワイパーアーム、ドアハンドル、ドアミラーステイ、ルーフレール等や、家具用部品、例えば椅子の脚、机の脚等、住宅設備部品、手摺り、クレセント等の用途にガラス繊維強化ポリアミド樹脂やガラス繊維強化ポリエステル樹脂が使われている。これら、ガラス繊維強化樹脂から得られる成形品の強度や、剛性を高めるためには、比較的高濃度のガラス繊維を配合する必要があるが、ガラス繊維を高濃度に配合すると、成形流動性が悪くなったり、ガラス繊維が表面に露出した、外観の悪い成形品になり易い。特開平６−７３２８８号公報や特開２０００−２１９８０８号公報には吸水時の剛性および外観に優れたガラス繊維強化ポリアミドが開示されているが、これらのポリアミドであっても、吸水時の剛性が充分で無い場合がある。 Conventionally, automotive structural parts that require high strength, high rigidity and good appearance, such as wiper arms, door handles, door mirror stays, roof rails, etc., furniture parts such as chair legs, desk legs, etc. Glass fiber reinforced polyamide resin and glass fiber reinforced polyester resin are used for parts, handrails, crescents and other applications. In order to increase the strength and rigidity of a molded product obtained from these glass fiber reinforced resins, it is necessary to blend relatively high concentrations of glass fibers. It tends to become a molded article with a bad appearance or a glass fiber exposed on the surface. In JP-A-6-73288 and JP-A-2000-219808, glass fiber reinforced polyamides having excellent rigidity and appearance at the time of water absorption are disclosed, but even these polyamides have rigidity at the time of water absorption. It may not be enough.
一方ポリエステルは、ポリアミドと比較し吸水率が極めて低いため、実用雰囲気下での剛性は有利であるが、ガラス繊維を比較的高充填すると、ポリエチレンテレフタレート（以下ＰＥＴと略す）や、ポリブチレンテレフタレート（以下ＰＢＴと略す）は、ガラス繊維が成形品表面に露出し易く、良好な外観を得るのが難しかった。 Polyester, on the other hand, has an extremely low water absorption compared to polyamide, and therefore has an advantageous rigidity in a practical atmosphere. However, when glass fibers are filled relatively high, polyethylene terephthalate (hereinafter abbreviated as PET) and polybutylene terephthalate ( (Hereinafter abbreviated as PBT), glass fibers were easily exposed on the surface of the molded product, and it was difficult to obtain a good appearance.
本発明は、実用雰囲気下での強度、剛性および表面光沢性の優れたガラス繊維強化熱可塑性ポリエステル樹脂組成物およびその成形品を提供することを目的とする。 An object of this invention is to provide the glass fiber reinforced thermoplastic polyester resin composition excellent in the intensity | strength in a practical atmosphere, rigidity, and surface glossiness, and its molded article.
本発明者は、前記課題を解決するため鋭意検討した結果、特定のポリエステル樹脂とガラス繊維を特定割合で含む組成物において、該組成物の溶融粘度を特定の範囲に制御することが有効であることを見出し本発明に至った。 As a result of intensive studies to solve the above problems, the present inventor is effective to control the melt viscosity of the composition within a specific range in a composition containing a specific polyester resin and glass fiber in a specific ratio. As a result, the present invention was reached.
すなわち、本発明は、
（１）１，３−プロピレンテレフタレートからなるポリエステル３０〜６０質量％と、ガラス繊維７０〜４０質量％からなり、下記の特性を満たす樹脂組成物を射出成形して得られる自動車構造部品であるドアハンドル、住宅設備部品である手摺り、及びクレセントから選ばれるいずれかであることを特徴とする射出成形品。
１）２７０℃かつ、せん断速度１０００／ｓｅｃにおける溶融粘度が、５０〜１５０Ｐａ・ｓ
２）シリンダ温度２９０℃、金型温度９０℃におけるＪＩＳ−Ｋ７１５０に準じた６０度グロスが７０〜８０％
３）ＡＳＴＭ Ｄ７９０に準じた曲げ強度が２２０ＭＰａ以上
４）ＡＳＴＭ Ｄ７９０に準じた曲げ弾性率の吸水時低下率が７．７％以下
に関する。
That is, the present invention
(1) A door which is an automobile structural part obtained by injection molding a resin composition comprising 30 to 60% by mass of a polyester composed of 1,3-propylene terephthalate and 70 to 40% by mass of glass fiber and satisfying the following characteristics. An injection-molded product characterized in that it is any one selected from a handle, a handrail as a housing equipment part, and a crescent.
1) The melt viscosity at 270 ° C. and a shear rate of 1000 / sec is 50 to 150 Pa · s.
2) 60 degree gloss according to JIS-K7150 at cylinder temperature 290 ° C and mold temperature 90 ° C is 70-80%
3) The bending strength according to ASTM D790 is 220 MPa or more. 4) The bending elastic modulus reduction rate according to ASTM D790 is 7.7% or less.
About the.
本発明によって、自動車構造部品、例えばワイパーアーム、ドアハンドル、ドアミラーステイ、ルーフレール等や、家具用部品、例えば椅子の脚、机の脚等、住宅設備部品、手摺り、クレセント等の用途に好適な、実用雰囲気下での強度、剛性および表面光沢性の優れたガラス繊維強化熱可塑性ポリエステル樹脂組成物およびその成形品が得られる様になった。 According to the present invention, it is suitable for automotive structural parts such as wiper arms, door handles, door mirror stays, roof rails, furniture parts such as chair legs and desk legs, housing equipment parts, handrails, crescents, etc. Thus, a glass fiber reinforced thermoplastic polyester resin composition excellent in strength, rigidity and surface gloss in a practical atmosphere and a molded product thereof can be obtained.
本発明に用いるＰＴＴ樹脂は、１，３−プロパンジオールとテレフタル酸およびまたは、テレフタル酸ジメチルを重縮合して得られるポリエステルである。また、本発明のＰＴＴ樹脂は、結晶性を損なわない範囲において、他のポリエステル形成モノマーとのコポリマーであっても良い。 The PTT resin used in the present invention is a polyester obtained by polycondensation of 1,3-propanediol and terephthalic acid and / or dimethyl terephthalate. Further, the PTT resin of the present invention may be a copolymer with another polyester-forming monomer as long as the crystallinity is not impaired.
本発明に用いるガラス繊維は、通常熱可塑性樹脂に使用されているものを使うことができ、原料としてのガラス繊維径やガラス繊維のチョップ長に特に制限はなく、例えば直径が５〜２５μｍのチョップドストランド、ロービング、ミルドファイバーのいずれを使用しても良い。チョップドストランドを用いる場合には、その長さが０．１から１２ｍｍの範囲で適宜選択して用いることができる。 As the glass fiber used in the present invention, those usually used in thermoplastic resins can be used, and there is no particular limitation on the glass fiber diameter and the glass fiber chop length as a raw material, for example, a chopped diameter of 5 to 25 μm. Any of strand, roving, and milled fiber may be used. When using chopped strands, the length can be appropriately selected and used within a range of 0.1 to 12 mm.
また、ガラス繊維の表面に通常公知のシラン系カップリング剤を付着させたものを用いても良い。例えばγ−アミノプロピルトリメトキシシラン、γ−アミノプロピルトリエトキシシラン、Ｎ−β（アミノエチル）−γ−アミノプロピルトリメトキシシラン、ビニルトリエトキシシラン、γ−グリシドキシプロピルトリメトキシシランなどが利用できる。さらに、集束剤として、エポキシ系樹脂、ウレタン系樹脂、無水マレイン酸変性ブタジエン系樹脂、無水マレイン酸スチレン系、アクリル酸等の公知の集束剤で処理されたガラス繊維を用いることができる。 Moreover, you may use what made the normally known silane coupling agent adhere to the surface of glass fiber. For example, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-β (aminoethyl) -γ-aminopropyltrimethoxysilane, vinyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, etc. are used. it can. Furthermore, glass fibers treated with a known sizing agent such as epoxy resin, urethane resin, maleic anhydride-modified butadiene resin, styrene maleic anhydride, acrylic acid, etc. can be used as the sizing agent.
本発明における、ＰＴＴ樹脂とガラス繊維の配合量はそれぞれ、３０〜６０重量％、７０〜４０重量％である。ガラス繊維の配合量が４０重量％より少ないと、充分な強度・剛性が得られない。ガラス繊維の配合量が７０重量％を越えると、成形品の表面にガラス繊維が露出しやすくなり、良好な外観が得られない。より好ましいガラス繊維の配合量は、５０〜６０重量％である。 In the present invention, the blending amounts of the PTT resin and the glass fiber are 30 to 60% by weight and 70 to 40% by weight, respectively. If the glass fiber content is less than 40% by weight, sufficient strength and rigidity cannot be obtained. When the blending amount of the glass fibers exceeds 70% by weight, the glass fibers are easily exposed on the surface of the molded product, and a good appearance cannot be obtained. A more preferable glass fiber content is 50 to 60% by weight.
本発明のガラス繊維強化熱可塑性ポリエステル樹脂組成物の溶融粘度は、２７０℃で、かつせん断速度１０００／ｓｅｃで測定したときに、５０〜１５０Ｐａ・ｓの範囲に制御する必要がある。溶融粘度が５０Ｐａ・ｓより低いと成形時に成形機ノズルからドローリングを起こしやすかったり、成形品にバリが出やすくなり好ましくない。溶融粘度が１５０Ｐａ・ｓより高いと成形品表面にガラス繊維が露出し易くなり好ましくない。 The melt viscosity of the glass fiber reinforced thermoplastic polyester resin composition of the present invention needs to be controlled in the range of 50 to 150 Pa · s when measured at 270 ° C. and a shear rate of 1000 / sec. When the melt viscosity is lower than 50 Pa · s, it is not preferable because it tends to cause a rolling from the nozzle of the molding machine during molding or burrs are easily generated on the molded product. When the melt viscosity is higher than 150 Pa · s, the glass fibers are easily exposed on the surface of the molded product, which is not preferable.
本発明におけるガラス繊維強化熱可塑性ポリエステル樹脂組成物の溶融粘度は、径が１ｍｍでありかつ、少なくとも２つ以上の長さの違うオリフィスを用いて測定したせん断粘度であり、２つ以上の長さの違うオリフィスによる測定に基づき管長補正した値である。また、測定に供するガラス繊維強化熱可塑性ポリエステル樹脂組成物は、ペレット状であっても、成形品を粉砕したものであっても良いが、その水分率によって、結果が大きく異なるため、乾燥し水分率を１００ｐｐｍ以下にして測定した値である。 The melt viscosity of the glass fiber reinforced thermoplastic polyester resin composition in the present invention is a shear viscosity measured using an orifice having a diameter of 1 mm and at least two different lengths, and the two or more lengths. The tube length is corrected based on the measurement using different orifices. In addition, the glass fiber reinforced thermoplastic polyester resin composition used for the measurement may be in the form of pellets or pulverized molded products, but the results greatly differ depending on the moisture content, so that the dried moisture It is a value measured at a rate of 100 ppm or less.
本発明のガラス繊維強化熱可塑性ポリエステル樹脂組成物の溶融粘度範囲を制御する方法に特に制限はないが、ガラス繊維を配合する際のＰＴＴ樹脂の分子量を制御する方法が有効である。なお、ここで配合するＰＴＴ樹脂の分子量を制御するには方法に特に制限はなく、通常、重合時間、重合時の脱気度を制御する方法や、粘度調節剤を添加する方法で、ＰＴＴ樹脂の分子量を制御できる。また、ガラス繊維と溶融混練する際に、配合するＰＴＴ樹脂の水分率を制御する方法や加水分解促進剤や重合触媒を添加する方法や溶融混練時のベント真空度を適宜設定する方法が例示できる。一方、ガラス繊維の配合量、径、繊維長、表面処理剤の種類によってもガラス繊維強化熱可塑性ポリエステル樹脂組成物の溶融粘度を変えることができる。前記方法を適宜組み合わせることで、ガラス繊維強化熱可塑性ポリエステル樹脂組成物の溶融粘度を本発明の範囲に制御することもできる。 Although there is no restriction | limiting in particular in the method of controlling the melt viscosity range of the glass fiber reinforced thermoplastic polyester resin composition of this invention, The method of controlling the molecular weight of PTT resin at the time of mix | blending glass fiber is effective. In addition, there is no restriction | limiting in particular in the method in order to control the molecular weight of PTT resin mix | blended here, Usually, PTT resin is the method of controlling polymerization time, the deaeration degree at the time of superposition | polymerization, and the method of adding a viscosity regulator. The molecular weight of can be controlled. Moreover, when melt kneading with glass fiber, a method of controlling the moisture content of the PTT resin to be blended, a method of adding a hydrolysis accelerator or a polymerization catalyst, and a method of appropriately setting the degree of vent vacuum during melt kneading can be exemplified. . On the other hand, the melt viscosity of the glass fiber reinforced thermoplastic polyester resin composition can also be changed depending on the blending amount, diameter, fiber length, and type of the surface treatment agent. By appropriately combining the above methods, the melt viscosity of the glass fiber reinforced thermoplastic polyester resin composition can be controlled within the range of the present invention.
本発明のガラス繊維強化熱可塑性ポリエステル樹脂組成物からなる成形品は、各種成形、例えば圧縮成形、射出成形、押出成形等により得られた成形品である。また、本発明のガラス繊維強化熱可塑性ポリエステル樹脂組成物は、特に射出成形品に好適であり、ガスアシスト成形などによる中空成形品や、炭酸ガス等による発泡成形品を含む。さらに、本発明の目的を損なわない範囲で２色成形、射出圧縮成形などの特殊な射出成形によっても得られる成形品を含む。また、成形品は用途によって、その表面全体または一部を、シボ加工したり、塗装することができる。射出成形条件としては、例えば、成形温度が２５０〜３１０℃の範囲、金型温度が４０〜１２０℃の範囲にて成形する方法が例示できる。 The molded product made of the glass fiber reinforced thermoplastic polyester resin composition of the present invention is a molded product obtained by various moldings such as compression molding, injection molding, extrusion molding and the like. The glass fiber reinforced thermoplastic polyester resin composition of the present invention is particularly suitable for injection molded products, and includes hollow molded products by gas assist molding and foamed molded products by carbon dioxide gas. Further, it includes a molded product obtained by special injection molding such as two-color molding or injection compression molding as long as the object of the present invention is not impaired. Further, the entire surface or a part of the molded product can be textured or painted depending on the application. Examples of the injection molding conditions include a method of molding in a range where the molding temperature is 250 to 310 ° C and the mold temperature is 40 to 120 ° C.
本発明のガラス繊維強化熱可塑性ポリエステル樹脂には、本発明の目的を損なわない範囲で、１またはそれ以上の通常の添加剤、例えば、酸化、熱、および紫外線劣化に対する安定剤及び禁止剤、潤滑剤および離型剤、染料及び顔料を含む着色剤、核形成剤、発泡剤、可塑剤、ガラス繊維を除く無機充填材（例えば、炭素繊維、マイカ、タルク、ワラストナイト、カオリン、焼成カオリン、炭酸カルシウム、チタン酸カリウム等）、難燃剤、帯電防止剤などを適宜添加することができる。 The glass fiber reinforced thermoplastic polyester resin of the present invention includes one or more conventional additives such as stabilizers and inhibitors against oxidation, heat, and UV degradation, lubrication, as long as the object of the present invention is not impaired. Agents and mold release agents, coloring agents including dyes and pigments, nucleating agents, foaming agents, plasticizers, inorganic fillers excluding glass fibers (for example, carbon fibers, mica, talc, wollastonite, kaolin, calcined kaolin, Calcium carbonate, potassium titanate, etc.), a flame retardant, an antistatic agent, and the like can be appropriately added.
本発明について以下具体的に説明する。
実施例、比較例中の評価は、次の方法で行った。
The present invention will be specifically described below.
Evaluation in Examples and Comparative Examples was performed by the following method.
（１）溶融粘度：
ＲＯＳＡＮＤ社製ツインキャピラリーレオメーターＲＨ７−２型を使用し、温度２７０℃、せん断速度１０００／ｓｅｃにおける溶融せん断粘度を測定した。
その際、オリフィスは、ダイ径１．０ｍｍ、ダイ入口角１８０度、のもので、オリフィス長とオリフィス径の比Ｌ／Ｄが１６及び０．２５、の２つのオリフィスを使用し、管長補正を行ったものを溶融粘度とした。測定に供した試料は、下記（２）で得られた試験片を約３ｍｍ大に粉砕したものを１２０℃にて一昼夜真空乾燥したものを用いた。
(1) Melt viscosity:
A melt capillary viscosity at a temperature of 270 ° C. and a shear rate of 1000 / sec was measured using a twin capillary rheometer RH7-2 manufactured by ROSAND.
At that time, the orifice has a die diameter of 1.0 mm and a die entrance angle of 180 degrees. Two orifices having a ratio L / D of the orifice length to the orifice diameter of 16 and 0.25 are used to correct the pipe length. What was done was taken as the melt viscosity. As a sample used for the measurement, a sample obtained by pulverizing the test piece obtained in the following (2) to a size of about 3 mm and vacuum-dried at 120 ° C. for a whole day and night was used.
（２）機械的特性（強度、弾性率）：
東芝機械（株）社製ＩＳ５０ＥＰ射出成形機を用い、シリンダー温度２９０℃、金型温度９０℃で、充填時間が約１秒になるよう射出圧力、速度を適宜調整して厚み３ｍｍの試験片を得た。得られた試験片を用い、引張強度をＡＳＴＭ Ｄ６３８、曲げ強度・弾性率をＡＳＴＭ Ｄ７９０に準じ測定した。
８０℃における曲げ弾性率Ｙの測定には、（株）オリエンテック社製 恒温槽付きテンシロン ＵＴＭ−２．５Ｔを用いた。
吸水時の曲げ弾性率は、試験片を温度２３℃、相対湿度５０％の部屋にて、吸水による重量変化がなくなるまで、静置したのち測定した。
(2) Mechanical properties (strength, elastic modulus):
Using an IS50EP injection molding machine manufactured by Toshiba Machine Co., Ltd., a test piece having a thickness of 3 mm was prepared by appropriately adjusting the injection pressure and speed so that the filling time was about 1 second at a cylinder temperature of 290 ° C. and a mold temperature of 90 ° C. Obtained. Using the obtained test piece, the tensile strength was measured according to ASTM D638, and the bending strength and elastic modulus were measured according to ASTM D790.
Tensilon UTM-2.5T with a thermostatic bath manufactured by Orientec Co., Ltd. was used to measure the flexural modulus Y at 80 ° C.
The bending elastic modulus at the time of water absorption was measured after leaving the test piece in a room at a temperature of 23 ° C. and a relative humidity of 50% until there was no change in weight due to water absorption.
（３）表面光沢性：
東芝機械（株）社製ＩＳ１５０Ｅ射出成形機を用い、シリンダー温度２９０℃、金型温度９０℃で、充填時間が約１秒になるよう射出圧力、速度を適宜調整して１３０ｘ１３０ｘ３ｍｍの平板状成形品を得た。この平板を用い、光沢計（ＨＯＲＩＢＡ製ＩＧ３２０）を用いてＪＩＳ−Ｋ７１５０に準じて６０度グロスを測定した。
(3) Surface glossiness:
Using a IS150E injection molding machine manufactured by TOSHIBA MACHINE CO., LTD., A cylinder shape of 290 ° C, a mold temperature of 90 ° C, and adjusting the injection pressure and speed appropriately so that the filling time is about 1 second, a 130 x 130 x 3 mm flat plate shaped product Got. Using this flat plate, 60 degree gloss was measured according to JIS-K7150 using a gloss meter (IG320 manufactured by HORIBA).
実施例１
シェル社製ＰＴＴ樹脂ＣＰ５０９２００および日本電気硝子社製ガラス繊維（Ｔ１８７ 径１３μｍ）を用いた。該ＰＴＴ樹脂を東芝機械（株）社製同方向回転２軸押出機ＴＥＭ３５の最上流供給位置より供給し、ガラス繊維をガラス繊維濃度が４５重量％になるようサイドフィードした。尚、シリンダー温度は２９０℃、ベント減圧度−７０ｃｍＨｇにて溶融混練した。ダイより押し出された溶融組成物を冷却バスにて水冷し、カッターにてペレット状にした。得られたペレットを１２０℃で一昼夜真空乾燥し評価に供した。評価結果を表１に示す。
Example 1
PTT resin CP509200 manufactured by Shell and glass fiber manufactured by Nippon Electric Glass Co., Ltd. (T187 diameter 13 μm) were used. The PTT resin was supplied from the most upstream supply position of a unidirectional rotating twin-screw extruder TEM35 manufactured by Toshiba Machine Co., Ltd., and the glass fibers were side-fed so that the glass fiber concentration was 45% by weight. The cylinder temperature was 290 ° C., and melt kneading was performed at a vent pressure reduction of −70 cmHg. The molten composition extruded from the die was water-cooled with a cooling bath and pelletized with a cutter. The obtained pellets were vacuum-dried at 120 ° C. all day and night for evaluation. The evaluation results are shown in Table 1.
実施例２、３
ガラス繊維濃度を表１に示す様に配合した他は、実施例１同様の方法で組成物を得た。
Examples 2 and 3
A composition was obtained in the same manner as in Example 1 except that the glass fiber concentration was blended as shown in Table 1.
比較例１
ベント真空度を−１０ｃｍＨｇとした他は、実施例１と同様の方法で組成物を得た。
Comparative Example 1
A composition was obtained in the same manner as in Example 1 except that the vent vacuum was -10 cmHg.
比較例２、３
ガラス繊維濃度を表１に示す様に配合した他は、実施例１同様の方法で組成物を得た。
Comparative Examples 2 and 3
A composition was obtained in the same manner as in Example 1 except that the glass fiber concentration was blended as shown in Table 1.
比較例４
後述の製造例によって得られたポリアミド６６／６Ｉ共重合体を用いた他は、
実施例１同様の方法で組成物を得た。
Comparative Example 4
Other than using the polyamide 66 / 6I copolymer obtained by the following production example,
A composition was obtained in the same manner as in Example 1.
比較例５
帝人製ＰＥＴ ライナイトＣ３０４５（ガラス繊維濃度４５％）を比較材料として用いた。
Comparative Example 5
Teijin PET Lineite C3045 (glass fiber concentration 45%) was used as a comparative material.
製造例
アジピン酸とヘキサメチレンジアミンの等モル塩２．０５ｋｇとイソフタル酸とヘキサメチレンジアミンの等モル塩０．４５ｋｇ及び純水２．５ｋｇを５リットルオートクレーブに仕込み良く攪拌しながら、充分に窒素置換した。攪拌を継続しながら温度を室温から２２０℃まで約１時間で昇温した。この後、オートクレーブの内圧を１８ｋｇ／ｃｍ2−Ｇになるよう水を反応系外に除去しながら約２時間かけて温度を２６０℃に昇温した。その後加熱をやめ、オートクレーブを密閉し、約８時間かけて室温まで冷却し、約２ｋｇのポリマーを得た。得られたポリマーを粉砕し、１０リットルのエバポレータを用い、窒素気流下２００℃で１０時間固相重合して分子量をさらに上げた。固相重合によって蟻酸溶液粘度は、１１から２７になった。
Production Example 2.05 kg of equimolar salt of adipic acid and hexamethylenediamine, 0.45 kg of equimolar salt of isophthalic acid and hexamethylenediamine, and 2.5 kg of pure water were charged into a 5-liter autoclave and thoroughly substituted with nitrogen. did. While continuing stirring, the temperature was raised from room temperature to 220 ° C. in about 1 hour. Thereafter, the temperature was raised to 260 ° C. over about 2 hours while removing water from the reaction system so that the internal pressure of the autoclave was 18 kg / cm 2 -G. Thereafter, the heating was stopped, the autoclave was sealed, and it was cooled to room temperature over about 8 hours to obtain about 2 kg of polymer. The obtained polymer was pulverized and solid-phase polymerized at 200 ° C. for 10 hours under a nitrogen stream using a 10 liter evaporator to further increase the molecular weight. The formic acid solution viscosity was changed from 11 to 27 by solid phase polymerization.
Claims (1)
１）２７０℃かつ、せん断速度１０００／ｓｅｃにおける溶融粘度が、５０〜１５０Ｐａ・ｓ
２）シリンダ温度２９０℃、金型温度９０℃におけるＪＩＳ−Ｋ７１５０に準じた６０度グロスが７０〜８０％
３）ＡＳＴＭ Ｄ７９０に準じた曲げ強度が２２０ＭＰａ以上
４）ＡＳＴＭ Ｄ７９０に準じた曲げ弾性率の吸水時低下率が７．７％以下 Door handle, housing, which is an automotive structural part made of 30 to 60% by mass of polyester composed of 1,3-propylene terephthalate and 70 to 40% by mass of glass fiber and obtained by injection molding a resin composition satisfying the following characteristics: An injection-molded product characterized in that it is one selected from handrails and crescents that are equipment parts.
1) The melt viscosity at 270 ° C. and a shear rate of 1000 / sec is 50 to 150 Pa · s.
2) 60 degree gloss according to JIS-K7150 at cylinder temperature 290 ° C and mold temperature 90 ° C is 70-80%
3) The bending strength according to ASTM D790 is 220 MPa or more. 4) The bending elastic modulus reduction rate according to ASTM D790 is 7.7% or less.
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| JPS4847941A (en) * | 1971-10-22 | 1973-07-07 | ||
| JPH05112703A (en) * | 1991-03-08 | 1993-05-07 | Nippon Petrochem Co Ltd | Polyester resin composition |
| JPH07173375A (en) * | 1993-12-17 | 1995-07-11 | Du Pont Kk | Flame retardant polyester resin composition for sealing molding |
| JP3664195B2 (en) * | 1996-03-22 | 2005-06-22 | 新日本石油株式会社 | Method for producing polyolefin material |
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