WO2005056626A1 - Ester resin composition and molded article thereof - Google Patents

Ester resin composition and molded article thereof Download PDF

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Publication number
WO2005056626A1
WO2005056626A1 PCT/JP2003/015960 JP0315960W WO2005056626A1 WO 2005056626 A1 WO2005056626 A1 WO 2005056626A1 JP 0315960 W JP0315960 W JP 0315960W WO 2005056626 A1 WO2005056626 A1 WO 2005056626A1
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Prior art keywords
ester resin
resin composition
shrinkage
rubber
based low
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PCT/JP2003/015960
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French (fr)
Japanese (ja)
Inventor
Tatsuo Hirabayashi
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Matsushita Electric Works, Ltd.
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Application filed by Matsushita Electric Works, Ltd. filed Critical Matsushita Electric Works, Ltd.
Priority to PCT/JP2003/015960 priority Critical patent/WO2005056626A1/en
Priority to AU2003289064A priority patent/AU2003289064A1/en
Priority to JP2005511681A priority patent/JPWO2005056626A1/en
Publication of WO2005056626A1 publication Critical patent/WO2005056626A1/en

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
    • C08L63/10—Epoxy resins modified by unsaturated compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
    • C08F290/08—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated side groups
    • C08F290/14—Polymers provided for in subclass C08G
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
    • C08F290/08—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated side groups
    • C08F290/14—Polymers provided for in subclass C08G
    • C08F290/141—Polyesters; Polycarbonates

Definitions

  • the present invention relates to an ester resin composition, particularly an ester resin composition for enclosing a motor or a coil, and a molded article obtained therefrom.
  • Means for preventing the temperature rise and driving the motor with high efficiency include improving the heat dissipation of the motor.
  • a specific means is to enclose the motor with resin. That is, the heat dissipation of the motor can be enhanced by enclosing the motor with a resin composition containing an inorganic filler to increase the thermal conductivity.
  • an isophthalanolic acid-based, terephthalic acid-based or hydrogenated bisphenol-based unsaturated polyester resin is generally used because of its good moldability.
  • ester resins have the property of shrinking during molding and curing. Therefore, a low shrinkage agent is used in the ester resin composition in order to suppress shrinkage of the ester resin and achieve good dimensional accuracy of the encapsulated motor.
  • polyester-based or polystyrene-based low-shrinkage agents have been generally used as these low-shrinkage agents.
  • the operating environment of the motor may exceed a high temperature of 200 ° C, and such a conventional resin composition containing an unsaturated polyester resin and a polyester- or polystyrene-based low-shrinkage agent may have such a problem. At a very high temperature, a remarkable decrease in physical properties was observed.
  • An object of the present invention is to provide a luster composition which has both good moldability and low shrinkage and excellent heat resistance.
  • Nopolak-type vulester resin having a novolak skeleton in its molecular structure and an ester resin composition containing a rubber-based low-shrinkage agent have been found to have both good moldability and low shrinkage and excellent heat resistance.
  • the ester resin composition of the present invention is characterized in that it contains a novolac-type Buerester resin having a novolak skeleton in its molecular structure.
  • the nopolak-type polyurethane resin is superior in heat resistance compared to an isophthalic acid-based, terephthalic acid-based or hydrogenated bisphenol-based unsaturated polyester resin conventionally used as an encapsulating resin composition.
  • any conventionally known nopolak type bier ester resin can be used as the novolak type vulester resin.
  • Examples of commercially available novolak-type vinyl ester resins that can be used include novolak-type vinyl ester resins manufactured by Nippon Upika Co., Ltd. with product numbers 8411 L, 8411 H or 8450. Mixtures of various novolak type bullet ester resins can also be used. From the viewpoint of moldability, it is preferable to use a novolak-type vinyl ester resin having a Brookfield viscosity of 10 to 25 ° C. at 25 ° C.
  • the ester resin composition of the present invention is characterized in that a rubber-based low-shrinking agent is used as the low-shrinking agent.
  • a rubber-based low-shrinking agent is used as the low-shrinking agent.
  • the ester resin composition of the present invention containing both a novolak-type beer ester resin and a rubber-based low-shrinkage agent does not contain a rubber-based low-shrinkage agent. It has improved heat resistance compared to a resin composition, that is, a resin composition containing a novolak-type beal ester resin and a conventional polystyrene-based low-shrinkage agent.
  • Rubber-based low-shrinkage agents are also known, and basically any rubber-based low-shrinkage agent can be used in the present invention.
  • Examples of commercially available rubber-based low-shrinkage agents that can be used include a rubber-based low-shrinkage agent manufactured by Nippon Upika Co., Ltd., with product numbers A-33 or A-35. Mixtures of various rubbery low shrinkage agents can also be used.
  • the rubber-based low-shrinkage agent is preferably uniformly dispersed, and more preferably compatibilized, in the nopolak-type bulester resin in order to achieve a further excellent low-shrinkage property.
  • the “uniform dispersion” in the present invention means that the rubber-based low-shrinkage agent is finely and uniformly dispersed in the nopolak-type vinyl ester resin and no sedimentation or phase separation occurs. means.
  • the method for uniformly dispersing the polymer is known to those skilled in the art, and the method for uniformly dispersing the rubber-based low-shrinkage agent in the present invention is not particularly limited. Dispersants or compatibilizers can be used for this purpose as long as they do not adversely affect moldability, low shrinkage and heat resistance.
  • Ester resin composition of the present invention the based on the total weight, preferably 1 0-5 0 weight 0/0, more preferably 1 1-3 0% by weight, and most preferably of 1 3-2 5 wt% containing novolac bi two / Reesuteru resin, and preferably from 0.5 to 1 5 weight 0/0, more preferably 1-1 0 weight 0/0, the most preferably 1 to 5 wt% of the rubber-based low profile additive Have.
  • the ester resin composition of the present invention can have both excellent heat resistance and low shrinkage.
  • the ester resin composition of the present invention may contain an inorganic filler.
  • This inorganic filler preferably has a decomposition temperature of 300 ° C. or more from the viewpoint of heat resistance) / ⁇ .
  • Examples of the inorganic filler include calcium carbonate, alumina and silica, and these can be used alone or in a mixture. From the viewpoint of moldability, it is preferable to use 50 to 80% by mass of an inorganic filler based on the mass of the ester resin composition.
  • a curing agent such as a peroxidized product.
  • a curing agent Nippon Yushi Co., Ltd. -Butyl peroxybenzoate
  • Mixtures of various hardeners can also be used.
  • the curing agent can be added during the production of the ester resin composition or before the molding of the resin composition.
  • the ester resin composition of the present invention is also characterized in that it can be thickened using magnesium oxide (MgO) to achieve good moldability.
  • MgO magnesium oxide
  • the thickening effect of magnesium oxide on the ester resin is affected by the molecular structure of the ester resin. That is, not all ester resins are satisfactorily thickened by magnesium oxide.
  • the novolak-type beer ester resin used in the present invention is favorably thickened by magnesium oxide. Therefore, the ester resin composition of the present invention preferably contains magnesium oxide in order to obtain good moldability.
  • the ester resin composition of the present invention may preferably contain glass fiber such as glass fiber or carbon as a reinforcing material. These glass fibers and the like are included in the concept of the inorganic filler, but due to their high reinforcing effect, in the present invention, they are particularly classified as reinforcements and treated separately from inorganic fillers. Glass fibers having a fiber length of 1.5 to 5 mm are usually used in the present invention.
  • the ester resin composition of the present invention preferably has a mass of 4 to: 0 mass based on the mass of the ester resin composition. Contains glass fiber.
  • the ester resin composition of the present invention can optionally contain additives and auxiliaries known to those skilled in the art, for example, a release agent (eg, wax, zinc stearate, carnauba) or a pigment (eg, carbon black). .
  • a release agent eg, wax, zinc stearate, carnauba
  • a pigment eg, carbon black
  • ester resin composition of the present invention has good low shrinkage during molding and shows good heat resistance after molding and curing, and is therefore particularly suitable for producing molded articles enclosing a motor or a coil. .
  • the present invention also provides a molded article obtained by molding the ester resin composition of the present invention.
  • the method for producing the molded article of the present invention is not particularly limited.
  • a molded article enclosing a motor can be produced by fixing a motor in a mold and performing transfer molding or injection molding. .
  • ester resin compositions of Examples 1 to 5 and Comparative Examples 1 to 6 were produced by charging the raw materials shown in Table 1 in a can and mixing them at 25 to 30 ° C for 20 to 40 minutes.
  • the raw materials used are:
  • Nopolak-type vulester resin VP 701 manufactured by Dainippon Ink Co., Ltd. • Hydrogenated bisphenol A-based unsaturated polyester resin: Upica 7123 manufactured by Nippon Upka Co., Ltd.
  • Rubber-based low shrinkage agent A-37 manufactured by Nippon Upika Co., Ltd.
  • Polyester-based low-shrinkage agent A T60 OH manufactured by Sakuramoto Co., Ltd.
  • Glass fiber R ESO 3BM5 manufactured by Nippon Glass Wei Co., Ltd.
  • the ester resin compositions of Examples and Comparative Examples were molded using a test piece mold (for direct pressure molding) under the conditions of a mold temperature of 145 ° C, a pressure of 1 OMPa, and a curing time of 180 seconds.
  • the molding shrinkage at that time was measured according to JIS K6911. The results are shown in Table 1. 3) Heat resistance
  • the test piece was left at 240 ° C for 200 hours, and the mass reduction rate was measured. The results are shown in Table 1.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Macromonomer-Based Addition Polymer (AREA)

Abstract

An ester resin composition which comprises a novolak vinyl ester resin having a novolak skeleton in the molecular structure and a rubbery shrinkage-reducing agent; and a molded article obtained from the composition.

Description

エステル樹脂組成物およびその成形品 技術分野  Ester resin composition and molded article thereof
本発明は、 エステノレ樹脂組成物、 特にモータまたはコイルを封入するためのェ ステル樹脂組成物、 およびそれから得られる成形品に関する。  The present invention relates to an ester resin composition, particularly an ester resin composition for enclosing a motor or a coil, and a molded article obtained therefrom.
明  Light
背景技術 Background art
電気 ·電子機器の性能向上に伴い、 細そ 1の部品、 例えばモータおよびコイルの改 良、 特にモータの小型化、 高効率ィヒおよび高出力化などが求められている。 モータは、 その発熱により温度が上昇するにつれ、 出力が低下する。 従ってモ 一タが蓄熱すると、 本来のモータ性能が得られず、 機器の性能が次第に低下して いく。 その結果、 モータの高効率化および高出力化の要請を満たすことができな い。  As the performance of electrical and electronic equipment has improved, there has been a demand for improved parts, such as motors and coils, especially motor miniaturization, high efficiency and high output. The output of the motor decreases as the temperature rises due to the heat generated. Therefore, when the motor accumulates heat, the original motor performance cannot be obtained, and the performance of the equipment gradually decreases. As a result, the demands for higher efficiency and higher output of the motor cannot be satisfied.
温度上昇を防止し、 モータを高効率で駆動させる手段として、 モータの熱放散 性を高めることが挙げられる。 その具体的手段には、 樹脂によるモータの封入化 がある。 即ち、 無機充填材を含有させて熱伝導性を高めた樹脂組成物でモータを 封入することにより、 モータの熱放散性を高めることができる。  Means for preventing the temperature rise and driving the motor with high efficiency include improving the heat dissipation of the motor. A specific means is to enclose the motor with resin. That is, the heat dissipation of the motor can be enhanced by enclosing the motor with a resin composition containing an inorganic filler to increase the thermal conductivity.
このような封入用樹脂組成物として、 従来、 イソフタノレ酸系、 テレフタル酸系 または水素化ビスフエノール系不飽和ポリエステル樹脂が、 その良好な成形性か ら一般に使用されている。  Conventionally, as such an encapsulating resin composition, an isophthalanolic acid-based, terephthalic acid-based or hydrogenated bisphenol-based unsaturated polyester resin is generally used because of its good moldability.
これらのエステル樹脂は、 成形硬化時に収縮するという性質を有する。 従って エステル樹脂の収縮を抑制して、 封入化モータの良好な寸法精度を達成するため に、 エステル樹脂組成物中で低収縮剤が使用される。 これらの低収縮剤として、 従来、 ポリエステル系またはポリスチレン系低収縮剤が一般に使用されている。 し力 しながら、 モータの使用環境は 2 0 0 °Cの高温を超える場合があり、 不飽 和ポリエステル樹脂およぴポリエステル系またはポリスチレン系低収縮剤を含む 従来の樹脂組成物では、 そのような高温で著しい物性の低下がみられた。  These ester resins have the property of shrinking during molding and curing. Therefore, a low shrinkage agent is used in the ester resin composition in order to suppress shrinkage of the ester resin and achieve good dimensional accuracy of the encapsulated motor. Hitherto, polyester-based or polystyrene-based low-shrinkage agents have been generally used as these low-shrinkage agents. However, the operating environment of the motor may exceed a high temperature of 200 ° C, and such a conventional resin composition containing an unsaturated polyester resin and a polyester- or polystyrene-based low-shrinkage agent may have such a problem. At a very high temperature, a remarkable decrease in physical properties was observed.
従って、 良好な成形性および低収縮性と従来のものよりも優れた耐熱性とを併 せ持つ樹脂組成物が、 なお求められている。 Therefore, it combines good moldability and low shrinkage with heat resistance superior to conventional ones. There is still a need for a resin composition that can be used.
発明の開示 Disclosure of the invention
本発明の目的は、 良好な成形性および低収縮性と優れた耐熱性とを併せ持つ樹 月旨組成物を提供することである。  An object of the present invention is to provide a luster composition which has both good moldability and low shrinkage and excellent heat resistance.
分子構造中にノボラック骨格を有するノポラック型ビュルエステル榭脂およぴ ゴム系低収縮剤を含有するエステル樹脂組成物は、 良好な成形性および低収縮性 と優れた耐熱性とを併せ持つことを見出した。  Nopolak-type vulester resin having a novolak skeleton in its molecular structure and an ester resin composition containing a rubber-based low-shrinkage agent have been found to have both good moldability and low shrinkage and excellent heat resistance. Was.
発明を実施するための形態 BEST MODE FOR CARRYING OUT THE INVENTION
本発明のエステル樹脂組成物は、 分子構造中にノボラック骨格を有するノボラ ック型ビュルェステル樹脂を含有することを特徴とする。 ノポラック型ビュルェ ステル樹脂は、 従来、 封入用樹脂組成物として使用されているイソフタル酸系、 テレフタル酸系または水素化ビスフエノール系不飽和ポリエステノレ樹脂と比べて 耐熱性に優れている。  The ester resin composition of the present invention is characterized in that it contains a novolac-type Buerester resin having a novolak skeleton in its molecular structure. The nopolak-type polyurethane resin is superior in heat resistance compared to an isophthalic acid-based, terephthalic acid-based or hydrogenated bisphenol-based unsaturated polyester resin conventionally used as an encapsulating resin composition.
本発明において基本的に、 ノボラック型ビュルエステル樹脂として、 従来既知 のあらゆるノポラック型ビエルエステル樹脂を使用することができる。 使用し得 るノボラック型ビュルエステル樹脂の市販品の例として、 品番 8 4 1 1 L、 8 4 1 1 Hまたは 8 4 5 0の日本ュピカ株式会社製ノボラック型ビニルエステル樹脂 を挙げることができる。 様々なノボラック型ビュルエステル樹脂の混合物を使用 することもできる。 成形性の観点から、 2 5 °Cで 1 0〜： L O O d P a · sのブル ックフィールド粘度を有するノボラック型ビュルエステル樹脂を使用することが 好ましい。  In the present invention, basically, any conventionally known nopolak type bier ester resin can be used as the novolak type vulester resin. Examples of commercially available novolak-type vinyl ester resins that can be used include novolak-type vinyl ester resins manufactured by Nippon Upika Co., Ltd. with product numbers 8411 L, 8411 H or 8450. Mixtures of various novolak type bullet ester resins can also be used. From the viewpoint of moldability, it is preferable to use a novolak-type vinyl ester resin having a Brookfield viscosity of 10 to 25 ° C. at 25 ° C.
また本発明のエステル樹脂組成物は、 低収縮剤としてゴム系低収縮剤を使用す ることを特徴とする。 以下の実施例 1および比較例 5から示されるように、 ノボ ラック型ビエルエステル樹脂およびゴム系低収縮剤の両方を含有する本発明のェ ステル樹脂組成物は、 ゴム系低収縮剤を含有しない樹脂組成物、 即ちノボラック 型ビ-ルエステル樹脂と従来のポリスチレン系低収縮剤とを含有する樹脂組成物 よりも向上した耐熱性を有する。 即ち、 ノポラック型ビエルエステル樹脂とゴム 系低収縮剤とを併用することにより、 従来のポリスチレン系低収縮剤またはポリ エステル系低収縮剤を使用したものと比べて、 より良好な耐熱性を達成すること ができる。 Further, the ester resin composition of the present invention is characterized in that a rubber-based low-shrinking agent is used as the low-shrinking agent. As shown in the following Example 1 and Comparative Example 5, the ester resin composition of the present invention containing both a novolak-type beer ester resin and a rubber-based low-shrinkage agent does not contain a rubber-based low-shrinkage agent. It has improved heat resistance compared to a resin composition, that is, a resin composition containing a novolak-type beal ester resin and a conventional polystyrene-based low-shrinkage agent. That is, by using a nopolak-type bielester resin and a rubber-based low-shrinking agent in combination, better heat resistance is achieved as compared with a conventional polystyrene-based low-shrinking agent or a polyester-based low-shrinking agent. thing Can do.
ゴム系低収縮剤も知られており、 基本的に、 あらゆるゴム系低収縮剤を本発明 において使用することができる。 使用し得るゴム系低収縮剤の市販品の例として、 品番 A- 3 3または A- 3 5の日本ュピカ株式会社製ゴム系低収縮剤を挙げること ができる。 様々なゴム系低収縮剤の混合物も使用することができる。  Rubber-based low-shrinkage agents are also known, and basically any rubber-based low-shrinkage agent can be used in the present invention. Examples of commercially available rubber-based low-shrinkage agents that can be used include a rubber-based low-shrinkage agent manufactured by Nippon Upika Co., Ltd., with product numbers A-33 or A-35. Mixtures of various rubbery low shrinkage agents can also be used.
本発明のエステノレ樹脂組成物において、 さらに良好な低収縮性を達成するため に、 ノポラック型ビュルエステル樹脂中でゴム系低収縮剤を、 好ましくは均一分 散、 より好ましくは相溶化させる。  In the esterol resin composition of the present invention, the rubber-based low-shrinkage agent is preferably uniformly dispersed, and more preferably compatibilized, in the nopolak-type bulester resin in order to achieve a further excellent low-shrinkage property.
ここで本発明における 「均一分散」 とは、 ゴム系低収縮剤が、 ノポラック型ビ ニルエステル樹脂中に均一に微分散しており、 ノポラック型ビエルエステル樹月旨 力^沈殿または相分離しないことを意味する。 またポリマーの均一分散の方法は 当業者に既知であり、 本発明におけるゴム系低収縮剤の均一分散の方法に特に限 定は無い。 成形性、 低収縮性および耐熱性に悪影響を及ぼさない限り、 分散剤ま たは相溶化剤を、 この目的のために使用することができる。  Here, the “uniform dispersion” in the present invention means that the rubber-based low-shrinkage agent is finely and uniformly dispersed in the nopolak-type vinyl ester resin and no sedimentation or phase separation occurs. means. The method for uniformly dispersing the polymer is known to those skilled in the art, and the method for uniformly dispersing the rubber-based low-shrinkage agent in the present invention is not particularly limited. Dispersants or compatibilizers can be used for this purpose as long as they do not adversely affect moldability, low shrinkage and heat resistance.
本発明のエステル樹脂組成物は、 その全質量を基準に、 好ましくは 1 0〜 5 0 質量0 /0、 より好ましくは 1 1〜 3 0質量％、 最も好ましくは 1 3〜 2 5質量％の ノボラック型ビ二/レエステル樹脂、 および好ましくは 0. 5〜1 5質量0 /0、 より 好ましくは 1〜 1 0質量0 /0、 最も好ましくは 1〜 5質量％のゴム系低収縮剤を含 有する。 このような量のノボラック型ビュルエステル樹脂おょぴゴム系低収縮剤 を含有することにより、 本発明のエステル樹脂組成物は、 特に優れた耐熱性と低 収縮性とを併せ持つことができる。 Ester resin composition of the present invention, the based on the total weight, preferably 1 0-5 0 weight 0/0, more preferably 1 1-3 0% by weight, and most preferably of 1 3-2 5 wt% containing novolac bi two / Reesuteru resin, and preferably from 0.5 to 1 5 weight 0/0, more preferably 1-1 0 weight 0/0, the most preferably 1 to 5 wt% of the rubber-based low profile additive Have. By containing such an amount of the novolak-type vulester resin and the rubber-based low-shrinkage agent, the ester resin composition of the present invention can have both excellent heat resistance and low shrinkage.
本発明のエステル樹脂組成物は、 無機充填材を含有し得る。 この無機充填材は、 耐熱性の観点から、 3 0 0 °C以上の分解温度を有することが好まし)/ヽ。 無機充填 材の例として、 炭酸カルシウム、 アルミナまたはシリカなどを挙げることができ、 これらを、 単独または混合物で使用することができる。 エステル樹脂組成物の質 量を基準に 5 0〜 8 0質量％の無機充填材を使用することが、 成形性の観点から 好ましい。  The ester resin composition of the present invention may contain an inorganic filler. This inorganic filler preferably has a decomposition temperature of 300 ° C. or more from the viewpoint of heat resistance) / ヽ. Examples of the inorganic filler include calcium carbonate, alumina and silica, and these can be used alone or in a mixture. From the viewpoint of moldability, it is preferable to use 50 to 80% by mass of an inorganic filler based on the mass of the ester resin composition.
本発明のエステル樹脂組成物を硬化させるために、 過酸ィ匕物などの硬化剤を使 用する必要がある。 硬化剤の例として、 日本油脂株式会社製のパープチル Z ( t -プチルパーォキシベンゾエート） などが挙げられる。 様々な硬化剤の混合物も 使用することができる。 硬化剤を、 エステル樹脂組成物の製造中または樹脂組成 物の成形前に添加することができる。 In order to cure the ester resin composition of the present invention, it is necessary to use a curing agent such as a peroxidized product. As an example of a curing agent, Nippon Yushi Co., Ltd. -Butyl peroxybenzoate) and the like. Mixtures of various hardeners can also be used. The curing agent can be added during the production of the ester resin composition or before the molding of the resin composition.
本発明のエステル樹脂組成物は、 酸化マグネシウム （M g O) を用いて増粘さ せ、 良好な成形性を達成し得ることも特徴とする。 酸化マグネシウムのエステル 樹脂に対する増粘効果は、 エステル樹脂の分子構造等に影響を受ける。 即ち、 全 てのエステル樹脂が、 酸化マグネシウムによって良好に増粘されるとは限らない。 それに対して本発明において使用するノボラック型ビエルエステル樹脂は、 酸化 マグネシウムにより良好に増粘される。 従って本発明のエステル樹脂組成物は、 良好な成形性を得るため、 好ましくは酸ィ匕マグネシウムを含有する。  The ester resin composition of the present invention is also characterized in that it can be thickened using magnesium oxide (MgO) to achieve good moldability. The thickening effect of magnesium oxide on the ester resin is affected by the molecular structure of the ester resin. That is, not all ester resins are satisfactorily thickened by magnesium oxide. On the other hand, the novolak-type beer ester resin used in the present invention is favorably thickened by magnesium oxide. Therefore, the ester resin composition of the present invention preferably contains magnesium oxide in order to obtain good moldability.
本発明のエステル樹脂組成物は、 補強材として、 例えばガラス繊維または炭素 ¾锥など、 好ましくはガラス 維を含有し得る。 これらのガラス 維などは、 無 機充填材の概念に含まれるが、 その高い補強効果から本発明では特に補強材とし て分類し、 無機充填材と区別して取り扱う。 1 . 5〜 5 mmの繊維長を有するガ ラス繊維を、 通常、 本発明において使用する。 本発明のエステル樹脂組成物は、 良好な成形性および強度の両方を達成するため、 好ましくはエステル樹脂組成物 の質量を基準に 4〜： L 0質量。んのガラス繊維を含有する。  The ester resin composition of the present invention may preferably contain glass fiber such as glass fiber or carbon as a reinforcing material. These glass fibers and the like are included in the concept of the inorganic filler, but due to their high reinforcing effect, in the present invention, they are particularly classified as reinforcements and treated separately from inorganic fillers. Glass fibers having a fiber length of 1.5 to 5 mm are usually used in the present invention. In order to achieve both good moldability and strength, the ester resin composition of the present invention preferably has a mass of 4 to: 0 mass based on the mass of the ester resin composition. Contains glass fiber.
本発明のエステル樹脂組成物は、 所望により、 当業者に既知の添加剤および助 剤、 例えば離型剤 （ワックス、 ステアリン酸亜鉛、 カルナバなど） または顔料 (カーボンブラックなど） を含有することができる。  The ester resin composition of the present invention can optionally contain additives and auxiliaries known to those skilled in the art, for example, a release agent (eg, wax, zinc stearate, carnauba) or a pigment (eg, carbon black). .
本発明のエステル樹脂組成物は、 成形時における良好な低収縮性を有し、 成形 硬化後に良好な耐熱性を示すことから、 モータまたはコイルを封入する成形品を 製造するために特に適している。  INDUSTRIAL APPLICABILITY The ester resin composition of the present invention has good low shrinkage during molding and shows good heat resistance after molding and curing, and is therefore particularly suitable for producing molded articles enclosing a motor or a coil. .
従って本発明は、 本発明のエステル樹脂組成物を成形することにより得られた 成形品も提供する。 本発明の成形品の製造方法には特に限定は無いが、 例えばモ ータを金型内に固定してトランスファー成形または射出成形を行うことにより、 モータを封入する成形品を製造することができる。  Accordingly, the present invention also provides a molded article obtained by molding the ester resin composition of the present invention. The method for producing the molded article of the present invention is not particularly limited. For example, a molded article enclosing a motor can be produced by fixing a motor in a mold and performing transfer molding or injection molding. .
実施例 Example
1 .エステル樹脂組成物の製造 表 1に示される原料を-一ダ一に投入し、 25〜30°Cで 20〜40分間混合 することにより、 実施例 1〜 5および比較例 1〜 6のエステル樹脂組成物を製造 した。 1. Manufacture of ester resin composition The ester resin compositions of Examples 1 to 5 and Comparative Examples 1 to 6 were produced by charging the raw materials shown in Table 1 in a can and mixing them at 25 to 30 ° C for 20 to 40 minutes.
使用した原料は、 以下のものである ：  The raw materials used are:
•ノポラック型ビュルエステル樹脂：大日本インキ株式会社製 VP 701 •水素化ビスフエノール A系不飽和ポリエステル樹脂： 日本ュピカ株式会社製 ュピカ 7123  • Nopolak-type vulester resin: VP 701 manufactured by Dainippon Ink Co., Ltd. • Hydrogenated bisphenol A-based unsaturated polyester resin: Upica 7123 manufactured by Nippon Upka Co., Ltd.
■ィソフタル酸系不飽和ポリエステル樹脂：武田薬品工業株会社製ポリマール 9516  ■ Isophthalic unsaturated polyester resin: POLYDAR 9516 manufactured by Takeda Pharmaceutical Company Limited
■ ゴム系低収縮剤： 日本ュピカ株式会社製 A- 37  ■ Rubber-based low shrinkage agent: A-37 manufactured by Nippon Upika Co., Ltd.
•ポリエステル系低収縮剤：株式会社曰本触媒製 A T60 OH  • Polyester-based low-shrinkage agent: A T60 OH manufactured by Sakuramoto Co., Ltd.
'ポリスチレン系低収縮剤：東洋スチレン株式会社製 H RM— 5 B  'Polystyrene-based low-shrinkage agent: HRM-5B manufactured by Toyo Styrene Co., Ltd.
-炭酸カルシウム： 日東粉化工業株式会社製 NS # 100  -Calcium carbonate: NS # 100 manufactured by Nitto Powder Chemical Co., Ltd.
•ァノレミナ：昭和電工株式会社製 A S 20  • Anoremina: Showa Denko KK A S 20
•水酸化アルミニウム：昭和電工株式会社製ハイジライト H32  • Aluminum hydroxide: Heidilite H32 manufactured by Showa Denko KK
•ガラス繊維： 日本硝子 維株式会社製 R ESO 3BM5  • Glass fiber: R ESO 3BM5 manufactured by Nippon Glass Wei Co., Ltd.
■硬化剤： 日本油脂株式会社製パーブチル Z  ■ Hardener: Perbutyl Z manufactured by NOF Corporation
'増粘剤：酸化マグネシウム （MgO)  '' Thickener: Magnesium oxide (MgO)
■離型剤：ステアリン酸亜鉛  ■ Release agent: zinc stearate
2.エステル樹脂組成物の特性評価  2.Evaluation of properties of ester resin composition
1) 成形性  1) Formability
実施例および比較例のエステル樹脂組成物の成形性を、 スパイラルフロー （金 型温度 150°C、 注入圧力 4.9MP a、 注入時間 30秒、 硬化時間： 90秒） により評価した。 その結果を表 1に示す。  The moldability of the ester resin compositions of Examples and Comparative Examples was evaluated by a spiral flow (mold temperature: 150 ° C, injection pressure: 4.9 MPa, injection time: 30 seconds, curing time: 90 seconds). The results are shown in Table 1.
2) 成形収縮率  2) Mold shrinkage
実施例および比較例のエステル樹脂組成物を、 試験片金型 （直圧成形用） を用 いて、 金型温度 145°C、 圧力 1 OMP a、 硬化時間 180秒の条件で成形した。 その際の成形収縮率を、 J I S K6911に準拠して測定した。 その結果を表 1に示す。 3) 耐熱性 The ester resin compositions of Examples and Comparative Examples were molded using a test piece mold (for direct pressure molding) under the conditions of a mold temperature of 145 ° C, a pressure of 1 OMPa, and a curing time of 180 seconds. The molding shrinkage at that time was measured according to JIS K6911. The results are shown in Table 1. 3) Heat resistance
実施例および比較例のエステル樹脂/組成物から、 試験片金型 （トランスファー 成形用） を用い、 金型温度 150°C、 注入圧力 5 MP a、 注入時間 30秒、 型締 め圧力 15MP a、 型締め時間 120秒の条件で、 70 mmX 40 mmX 3 m mの形状を有する試験片を製造した。  From the ester resin / composition of the example and the comparative example, using a test piece mold (for transfer molding), a mold temperature of 150 ° C, an injection pressure of 5 MPa, an injection time of 30 seconds, a mold clamping pressure of 15 MPa, Under the condition of a mold clamping time of 120 seconds, a test piece having a shape of 70 mm × 40 mm × 3 mm was manufactured.
この試験片を 240°Cで 200時間放置し、 その質量減少率を測定した。 その 結果を表 1に示す。 The test piece was left at 240 ° C for 200 hours, and the mass reduction rate was measured. The results are shown in Table 1.
(表 1) (table 1)
Figure imgf000008_0001
Figure imgf000008_0001

Claims

1 . 分子構造中にノポラック骨格を有するノボラック型ビュルエステル樹脂およ ぴゴム系低収縮剤を含有するエステル樹脂組成物。 1. An ester resin composition containing a novolak-type ester resin having a nopolak skeleton in its molecular structure and a rubber-based low-shrinkage agent.
2. ゴム系低収縮剤が、 ノポラック型ビュルエステル樹脂中に均一分散されてい ることを特徴とする請求項 1に記載のエステル樹脂組成物。  2. The ester resin composition according to claim 1, wherein the rubber-based low-shrinkage agent is uniformly dispersed in a nopolak-type vulester resin.
3. エステル樹脂組成物の質量を基準に 1 0〜 5 0質量％のノポラック型ビニル 請  3. 10 to 50% by mass of nopolak-type vinyl resin based on the mass of the ester resin composition
エステル樹脂および 0. 5〜1 5質量0 /0のゴム系低収縮剤を含有することを特徴 求 Wherein sought by containing a rubber-based low profile additives of the ester resin and from 0.5 to 1 5 weight 0/0
とする請求項 1または 2に記載のエステ 8ル樹脂組成物。 The ester resin composition according to claim 1 or 2, wherein
の  of
4. 3 0 0 °C以上の分解温度を有する無機充填材をさらに含有することを特徴と 窜  4. It further comprises an inorganic filler having a decomposition temperature of 300 ° C. or higher.
する請求項 1〜 3のいずれかに記載のエステル樹脂組成物。 The ester resin composition according to any one of claims 1 to 3.
囲  Enclosure
5. 酸化マグネシウム （M g O) をさらに含有することを特徴とする請求項 1〜 4のいずれかに記載のエステル樹脂組成物。  5. The ester resin composition according to any one of claims 1 to 4, further comprising magnesium oxide (MgO).
6. 請求項 1 - 5のいずれかに記載のエステル樹脂組成物を成形することにより 得られた成形品。  6. A molded article obtained by molding the ester resin composition according to any one of claims 1 to 5.
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