JPH11226991A - In-mold molding - Google Patents
In-mold moldingInfo
- Publication number
- JPH11226991A JPH11226991A JP2973898A JP2973898A JPH11226991A JP H11226991 A JPH11226991 A JP H11226991A JP 2973898 A JP2973898 A JP 2973898A JP 2973898 A JP2973898 A JP 2973898A JP H11226991 A JPH11226991 A JP H11226991A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- liquid crystal
- melt viscosity
- crystal polyester
- mold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0079—Liquid crystals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0094—Condition, form or state of moulded material or of the material to be shaped having particular viscosity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、インモールド成形
品に関する。更に詳しくは、本発明は、ノートパソコ
ン、携帯電話等の筐体として好適に使用されるインモー
ルド成形品に関する。[0001] The present invention relates to an in-mold molded product. More specifically, the present invention relates to an in-mold molded product suitably used as a housing for a notebook computer, a mobile phone, or the like.
【０００２】[0002]
【従来の技術】従来、ポリカーボネート（ＰＣ）、アク
リロニトリル−ブタジエン−スチレン（ＡＢＳ）樹脂等
の熱可塑性樹脂が、ノートパソコン、携帯電話等の携帯
用電子機器の筐体の成形材料として使用されている。こ
れらの樹脂は、衝撃的な荷重が加わった場合、容易に塑
性変形を起こすため、衝撃エネルギーを吸収することが
できる。そのため、筐体の破壊が起きにくい。しかしな
がら、近年、携帯用電子機器の普及に伴い、筐体の更な
る軽量化及び高強度化と共に、更に高い衝撃強度を実現
することが望まれている。2. Description of the Related Art Conventionally, thermoplastic resins such as polycarbonate (PC) and acrylonitrile-butadiene-styrene (ABS) resins have been used as molding materials for housings of portable electronic devices such as notebook computers and mobile phones. . These resins easily undergo plastic deformation when a shocking load is applied, and therefore can absorb shock energy. Therefore, destruction of the housing is unlikely to occur. However, in recent years, with the spread of portable electronic devices, it has been desired to realize even higher impact strength as well as further lightening and increasing the strength of the housing.
【０００３】ここで、筐体に使用される熱可塑性樹脂の
改良方法として、ポリマーアロイ化、熱可塑性樹脂に充
填材（例えば、ガラス繊維、タルク等）を添加する方法
等が知られている。ポリマーアロイ化は、特定の性質を
有する複数の樹脂を混合することにより、複数の樹脂の
性質を兼ね備えた混合樹脂を得る技術である。しかしな
がら、ポリマーアロイ化により得られる樹脂の性質は、
基本的に加成則に従っている。即ち、混合樹脂の性質
は、混合する前の樹脂の性質の中間的な性質となる。そ
のため、十分な性質の混合樹脂を得ることが困難であっ
た。Here, as a method for improving the thermoplastic resin used for the housing, a method of forming a polymer alloy, a method of adding a filler (for example, glass fiber, talc, or the like) to the thermoplastic resin, and the like are known. Polymer alloying is a technique for obtaining a mixed resin having the properties of a plurality of resins by mixing a plurality of resins having specific properties. However, the properties of the resin obtained by polymer alloying are
It basically follows the addition rule. That is, the properties of the mixed resin are intermediate properties of the properties of the resin before mixing. Therefore, it has been difficult to obtain a mixed resin having sufficient properties.
【０００４】一方、熱可塑性樹脂に充填材を添加する方
法では、曲げ強度や引張強度を向上させることはできる
が、衝撃強度は逆に低下する。更に、充填材を添加する
ことにより、熱可塑性樹脂の溶融粘度が上昇するため、
厚さの薄い成形品を得ることが困難であった。上記以外
の方法として、ゴム成分を耐衝撃性を向上させるために
添加する方法が知られている。しかしながら、ゴム成分
を添加すれば、熱可塑性樹脂の流動性が低下するため、
成形性が劣化する恐れがあった。また、得られる成形品
の耐熱性も低下することとなる。On the other hand, in the method of adding a filler to a thermoplastic resin, the bending strength and the tensile strength can be improved, but the impact strength is reduced. Furthermore, by adding a filler, the melt viscosity of the thermoplastic resin increases,
It was difficult to obtain a molded article having a small thickness. As a method other than the above, a method of adding a rubber component in order to improve impact resistance is known. However, if the rubber component is added, the fluidity of the thermoplastic resin decreases,
There was a possibility that the moldability would deteriorate. In addition, the heat resistance of the obtained molded article is also reduced.
【０００５】上記各方法の欠点を解決する方法として、
図３（ａ）及び（ｂ）に示すように、成形時に金属部品
１１を金型１２内に配置し、溶融した熱可塑性樹脂１３
を金属部品１１と共に射出成形することにより、熱可塑
性樹脂１５と金属部品１１とからなる成形品１４を製造
する、所謂インモールド成形が知られている。この方法
によれば、成形品の厚さの薄い部分に金属部品を配置す
ることができるため、該部分での衝撃強度を向上させる
ことができる。As a method for solving the drawbacks of the above methods,
As shown in FIGS. 3A and 3B, the metal component 11 is placed in the mold 12 at the time of molding, and the molten thermoplastic resin 13 is formed.
Is so-called in-mold molding in which a molded article 14 composed of a thermoplastic resin 15 and a metal part 11 is manufactured by injection-molding the metal part 11 together with the metal part 11. According to this method, since the metal component can be disposed in a thin portion of the molded product, the impact strength at the portion can be improved.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記イ
ンモールド成形では、金属部品の回りにおいて、熱可塑
性樹脂の流動性が不足するため、金型に樹脂を充填する
箇所（ゲート）を複数設ける必要があった。そのため、
金型の構造が複雑になっていた。更に、ゲートが複数個
存在するため、それぞれのゲートから充填された樹脂が
合流することにより、合流部で細線模様を呈する部分
（ウェルド部）が形成される。このウェルド部は、ウェ
ルド部以外の部分に比べて、衝撃強度が低いという欠点
があった。However, in the above-mentioned in-mold molding, since the fluidity of the thermoplastic resin is insufficient around the metal parts, it is necessary to provide a plurality of portions (gates) for filling the resin in the mold. there were. for that reason,
The structure of the mold was complicated. Furthermore, since there are a plurality of gates, the resin filled from each gate merges to form a portion (weld portion) exhibiting a fine line pattern at the junction. This weld has a disadvantage that the impact strength is lower than that of the parts other than the weld.
【０００７】更に、図３（ｃ）に示すように、軽量化の
ために金属部品１１の厚さを０．５ｍｍ以下にした場
合、成形時の熱可塑性樹脂１３の射出圧力により、金属
部品１１が変形し、その結果成形性が悪化する恐れがあ
った。なお、図３（ｃ）中、１６は、金型１２中で、高
圧で射出された熱可塑性樹脂により金属部品１１が変形
した部分を示している。Further, as shown in FIG. 3 (c), when the thickness of the metal part 11 is reduced to 0.5 mm or less for weight reduction, the injection pressure of the thermoplastic resin 13 during molding causes the metal part 11 May be deformed, and as a result, the moldability may be deteriorated. In FIG. 3C, reference numeral 16 denotes a portion of the metal mold 12 where the metal component 11 is deformed by the thermoplastic resin injected at a high pressure.
【０００８】上記のように、従来、軽量及び衝撃強度が
高レベルでバランスした成形品は得られていなかった。As described above, conventionally, a molded article having a high level of balance between lightweight and impact strength has not been obtained.
【０００９】[0009]
【課題を解決するための手段】かくして本発明によれ
ば、熱可塑性樹脂と金属部品からなるインモールド成形
品であって、熱可塑性樹脂が液晶ポリエステルと、該液
晶ポリエステルより溶融粘度の高い樹脂との混合樹脂か
らなることを特徴とするインモールド成形品が提供され
る。Thus, according to the present invention, there is provided an in-mold molded article comprising a thermoplastic resin and a metal part, wherein the thermoplastic resin comprises a liquid crystal polyester and a resin having a higher melt viscosity than the liquid crystal polyester. An in-mold molded product characterized by comprising a mixed resin of the following.
【００１０】[0010]
【発明の実施の形態】まず、本発明に使用できる熱可塑
性樹脂は、液晶ポリエステルと、該液晶ポリエステルよ
り溶融粘度の高い樹脂との混合樹脂からなる。液晶ポリ
エステルとしては、インモールド成形に使用することが
できるものであれば、特に限定されない。特に、サーモ
トロピック型の液晶ポリエステルを使用することが好ま
しい。例えば、パラヒドロキシ安息香酸、ビフェニルジ
オール、テレフタル酸、イソフタル酸、ヒドロキシナフ
タレンカルボン酸等のモノマーの単独重合体、これらモ
ノマーの共重合体、パラヒドロキシ安息香酸と他のモノ
マーの共重合体のパラヒドロキシ安息香酸を部分的に２
−オキシ−６−ナフトエ酸で置換した共重合体、ポリオ
キシテレフタレートをパラヒドロキシ安息香酸で改質し
た共重合体等が挙げられる。DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the thermoplastic resin usable in the present invention comprises a mixed resin of a liquid crystal polyester and a resin having a higher melt viscosity than the liquid crystal polyester. The liquid crystal polyester is not particularly limited as long as it can be used for in-mold molding. In particular, it is preferable to use a thermotropic liquid crystal polyester. For example, homopolymers of monomers such as parahydroxybenzoic acid, biphenyldiol, terephthalic acid, isophthalic acid, and hydroxynaphthalenecarboxylic acid, copolymers of these monomers, and parahydroxy copolymers of parahydroxybenzoic acid and other monomers Benzoic acid partially 2
Copolymers substituted with -oxy-6-naphthoic acid, copolymers obtained by modifying polyoxyterephthalate with parahydroxybenzoic acid, and the like.
【００１１】より具体的な液晶ポリエステルとしては、
ザイダー（日本石油化学社製）、エコノール（住友化学
社製）、ベクトラ（ポリプラスチック社製）、ロッドラ
ン（ユニチカ社製）、出光ＬＣＰ（出光石油化学社
製）、ノバキュレート（三菱化成社製）等が挙げられ
る。これら、液晶ポリエステルの内、ロッドランＬＣ−
３０００及びＬＣ−５０００シリーズを使用することが
より好ましい。More specific liquid crystal polyesters include:
Zyder (Nippon Petrochemical Co., Ltd.), Econol (Sumitomo Chemical Co., Ltd.), Vectra (Polyplastic Co., Ltd.), Rodrun (Unitika Co., Ltd.), Idemitsu LCP (Idemitsu Petrochemical Co., Ltd.), Novaculate (Mitsubishi Chemical Co., Ltd.) And the like. Of these liquid crystal polyesters, Rodrun LC-
More preferably, the 3000 and LC-5000 series are used.
【００１２】更に、本発明に使用する液晶ポリエステル
は、５０〜６００ポイズの範囲の溶融粘度を有するもの
を使用することが好ましい。なお、他の性質として、比
重１．３〜１．５、融点２００〜３００℃、分解温度３
５０〜４００℃、曲弾性率１〜１０ｋｇｆ／ｃｍ2 、耐
衝撃性５〜２０ｋｇｆ・ｃｍ／ｃｍ（アイゾット衝撃
値）を有する液晶ポリエステルを使用することがより好
ましい。Further, it is preferable that the liquid crystal polyester used in the present invention has a melt viscosity in the range of 50 to 600 poise. In addition, as other properties, specific gravity 1.3 to 1.5, melting point 200 to 300 ° C, decomposition temperature 3
It is more preferable to use a liquid crystal polyester having 50 to 400 ° C., a flexural modulus of 1 to 10 kgf / cm 2 , and impact resistance of 5 to 20 kgf · cm / cm (Izod impact value).
【００１３】次に、液晶ポリエステルと混合する樹脂
（以下、他の樹脂とも称する）としては、上記液晶ポリ
エステルより溶融粘度の高い樹脂であれば特に限定され
ない。他の樹脂の溶融粘度は、液晶ポリエステルより高
く、射出可能でありさえすればより。より好ましい他の
樹脂の溶融粘度は、５００〜６０００ポイズの範囲であ
る。特に、他の樹脂として、液晶ポリエステルの溶融粘
度の５〜１１０倍の溶融粘度を有する樹脂を使用するこ
とが好ましい。この範囲の溶融粘度をもつ他の樹脂を使
用すれば、インモールド成形時に、液晶ポリエステル
が、十分伸長され成形品のスキン層で棒状に配向し、高
い機械的強度（高剛性）を成形品に付与することができ
る。また、成形品のコア層には、ほとんど液晶ポリエス
テルが存在しないため、他の樹脂による耐衝撃性を保持
することができる。なお、他の樹脂の溶融粘度が液晶ポ
リエステルの溶融粘度の５倍未満である場合、成形品の
コア層にも液晶ポリエステルが分散するため、高剛性を
実現することはできるが、耐衝撃性を保持することが困
難となる。ここで、より好ましい他の樹脂の溶融粘度
は、液晶ポリエステルの溶融粘度の５〜１０倍である。Next, the resin to be mixed with the liquid crystal polyester (hereinafter also referred to as other resin) is not particularly limited as long as the resin has a higher melt viscosity than the liquid crystal polyester. Other resins have higher melt viscosities than liquid crystalline polyesters, as long as they can be injected. The more preferred melt viscosity of the other resin is in the range of 500 to 6000 poise. In particular, it is preferable to use, as another resin, a resin having a melt viscosity of 5 to 110 times the melt viscosity of the liquid crystal polyester. If another resin having a melt viscosity in this range is used, the liquid crystal polyester is sufficiently stretched during in-mold molding and is oriented in the form of a rod in the skin layer of the molded product, thereby giving the molded product high mechanical strength (high rigidity). Can be granted. Moreover, since almost no liquid crystal polyester is present in the core layer of the molded product, the impact resistance of another resin can be maintained. When the melt viscosity of the other resin is less than 5 times the melt viscosity of the liquid crystal polyester, the liquid crystal polyester is dispersed in the core layer of the molded product, so that high rigidity can be realized. It becomes difficult to hold. Here, the more preferable melt viscosity of the other resin is 5 to 10 times the melt viscosity of the liquid crystal polyester.
【００１４】他の樹脂としては、より具体的には、ポリ
カーボネート（ＰＣ）、アクリロニトリル−ブタジエン
−スチレン（ＡＢＳ）樹脂、ポリフェニレンエーテル
（ＰＰＥ）等の熱可塑性樹脂が挙げられる。更に、上記
液晶ポリエステルより溶融粘度が高ければ、他の種類の
液晶ポリエステルを混合してもよい。液晶ポリエステル
と他の樹脂との混合割合は、全樹脂に対して、液晶ポリ
エステルを１〜２０重量％の割合であることが好まし
い。液晶ポリエステルの混合割合が１重量％より少ない
場合、成形品スキン層の液晶ポリエステル含有量が少な
く、強度が向上しないので好ましくない。一方、２０重
量％より多い場合、ウェルド部の液晶ポリエステルが、
ウェルドラインに沿って配向し、ウェルド強度が低下す
るので好ましくない。More specifically, other resins include thermoplastic resins such as polycarbonate (PC), acrylonitrile-butadiene-styrene (ABS) resin, and polyphenylene ether (PPE). Further, if the melt viscosity is higher than that of the liquid crystal polyester, another type of liquid crystal polyester may be mixed. It is preferable that the mixing ratio of the liquid crystal polyester to the other resin is 1 to 20% by weight of the total resin. When the mixing ratio of the liquid crystal polyester is less than 1% by weight, the content of the liquid crystal polyester in the skin layer of the molded article is small, and the strength is not improved, which is not preferable. On the other hand, when the content is more than 20% by weight, the liquid crystal polyester in the weld portion is
It is not preferable because it is oriented along the weld line and the weld strength is reduced.
【００１５】更に、混合樹脂には無機充填剤を混合して
もよい。無機充填剤を混合することにより、成形品の曲
げ強度を向上させることができる。無機充填剤は、特に
限定されず、樹脂分野で公知の無機充填剤をいずれも使
用することができる。具体的には、炭酸カルシウム、タ
ルク、カオリンクレー、マイカ、シリカ等の無機充填剤
が挙げられる。無機充填剤の混合割合は、所望する成形
品の性質により異なるが、全混合樹脂に対して通常３〜
１０重量％である。Further, an inorganic filler may be mixed with the mixed resin. By mixing the inorganic filler, the bending strength of the molded article can be improved. The inorganic filler is not particularly limited, and any inorganic filler known in the resin field can be used. Specific examples include inorganic fillers such as calcium carbonate, talc, kaolin clay, mica, and silica. The mixing ratio of the inorganic filler varies depending on the properties of the desired molded product, but is usually 3 to
10% by weight.
【００１６】特に、無機充填剤の形状が、繊維状又は板
状であれば、曲げ強度を更に向上させることができる。
更に、繊維状又は板状の無機充填剤に、球状の無機充填
剤を加えることで、射出時の混合樹脂の流動性を向上さ
せることができる。本発明に使用できる金属部品の形状
は、特に限定されず、成形品の形状にあわせて適宜決め
ることができ、板状、棒状等の様々な形状を選択するこ
とができる。金属部品は、アルミニウム、銅等の金属
や、これらの合金等の種々の材料からなっていてもよ
い。金属部品の厚さは、０．１ｍｍ以上であることが好
ましく、０．１〜０．５ｍｍの範囲であれば、より軽量
な成形品をえることができる。Particularly, when the shape of the inorganic filler is fibrous or plate-like, the bending strength can be further improved.
Further, by adding a spherical inorganic filler to the fibrous or plate-like inorganic filler, the fluidity of the mixed resin at the time of injection can be improved. The shape of the metal component that can be used in the present invention is not particularly limited, and can be appropriately determined according to the shape of the molded product, and various shapes such as a plate shape and a rod shape can be selected. The metal component may be made of various materials such as metals such as aluminum and copper, and alloys thereof. The thickness of the metal part is preferably 0.1 mm or more, and if it is in the range of 0.1 to 0.5 mm, a lighter molded article can be obtained.
【００１７】成形品の形状は、特に限定されず、所望の
用途に応じて適宜変形可能である。金属部品は、混合樹
脂で被覆されていても、一部露出していてもよい。な
お、金属部品を一部露出させれば、より軽量な成形品を
得ることができる。次に、本発明の成形品を製造する方
法について説明する。まず、金型内の所望位置に金属部
品を配置する。次いで、金型に設けられたゲートから溶
融した混合樹脂（任意に無機充填剤を含む）を射出する
ことにより、金型内に充填する。The shape of the molded product is not particularly limited, and can be appropriately modified according to a desired use. The metal component may be covered with the mixed resin or may be partially exposed. If a part of the metal part is exposed, a lighter molded product can be obtained. Next, a method for producing the molded article of the present invention will be described. First, a metal component is arranged at a desired position in a mold. Next, the molten mixed resin (optionally containing an inorganic filler) is injected from a gate provided in the mold to fill the inside of the mold.
【００１８】本発明では、混合樹脂は、溶融粘度の低い
液晶ポリエステルを含んでいるため、混合樹脂の溶融粘
度を低下させることができる。そのため、射出圧力を低
減することができる。従って、図３（ｃ）に示すような
金属部品の変形を防止することができる。よって、従来
では使用が困難であった０．１ｍｍ程度の厚さの金属部
品も使用することが可能となる。更に、従来の熱可塑性
樹脂より溶融粘度が低いため、混合樹脂を充填するため
のゲートの数を減らすことができる。従って、金型の形
状をより簡略化することができる。In the present invention, since the mixed resin contains a liquid crystal polyester having a low melt viscosity, the melt viscosity of the mixed resin can be reduced. Therefore, the injection pressure can be reduced. Therefore, the deformation of the metal component as shown in FIG. 3 (c) can be prevented. Therefore, it is possible to use a metal part having a thickness of about 0.1 mm, which has been difficult to use in the past. Further, since the melt viscosity is lower than that of the conventional thermoplastic resin, the number of gates for filling the mixed resin can be reduced. Therefore, the shape of the mold can be further simplified.
【００１９】なお、本発明の発明者等は、液晶ポリエス
テルの種類により相違するが、液晶ポリエステルを１０
重量％添加することにより、混合樹脂の溶融粘度が３０
％以上低下し、更に射出圧力が３０％以上低減すること
を見いだしている。次に、射出は、使用する混合樹脂の
種類、所望する成形品の性質により異なるが、２２０〜
２９０℃の射出時の混合樹脂の温度、６０〜８０℃の金
型の温度、８００〜１２００ｋｇｆ／ｃｍ2 の射出圧
力、５〜８ｃｍ3 ／秒の射出速度の条件下で行うことが
好ましい。It should be noted that the present inventors differed depending on the type of the liquid crystal polyester.
The melt viscosity of the mixed resin is 30 by adding
% Or more, and the injection pressure is further reduced by 30% or more. Next, the injection varies depending on the type of the mixed resin used and the properties of the desired molded product.
It is preferable to carry out under the conditions of the temperature of the mixed resin at the time of injection of 290 ° C., the temperature of the mold of 60 to 80 ° C., the injection pressure of 800 to 1200 kgf / cm 2 , and the injection speed of 5 to 8 cm 3 / sec.
【００２０】特に、前記条件下で射出を行うことによ
り、射出された混合樹脂に高い伸長が加わるため、溶融
粘度の低い成分が溶融粘度の高い成分を覆うような構
造、即ち、液晶ポリエステルがスキン層に、他の樹脂が
コア層に主に存在する構造が形成される。ここで、スキ
ン層に存在する液晶ポリエステルは、繊維状に配向して
高い機械的強度（高剛性）を成形品に付与することとな
る。この理由は、外部から加えられた衝撃エネルギー
が、スキン層の液晶ポリエステルの繊維の破断や、液晶
ポリエステルの引き抜きに使用されるためであると考え
られる。In particular, by performing injection under the above-mentioned conditions, a high elongation is applied to the injected mixed resin, so that a component having a low melt viscosity covers a component having a high melt viscosity, that is, the liquid crystal polyester has a skin. In the layer, a structure in which another resin is mainly present in the core layer is formed. Here, the liquid crystal polyester present in the skin layer is oriented in a fibrous form and imparts high mechanical strength (high rigidity) to the molded article. It is considered that the reason for this is that the impact energy applied from the outside is used to break the fibers of the liquid crystal polyester of the skin layer and to pull out the liquid crystal polyester.
【００２１】更に、スキン層に液晶ポリエステルが存在
するため、金型からの転写性が向上し、高精度の成形品
を得ることができる。金型内に混合樹脂を射出した後、
金型から取り出すことにより成形品を得ることができ
る。Further, since the liquid crystal polyester is present in the skin layer, the transferability from the mold is improved, and a molded product with high precision can be obtained. After injecting the mixed resin into the mold,
A molded article can be obtained by taking out from the mold.
【００２２】[0022]
【実施例】以下、本発明を実施例に基づいて具体的に説
明する。 実施例１ 溶融粘度９８０ポイズ（２９０℃下）のユーピロン（Ｐ
Ｃ、三菱エンジニアリングプラスチックス社製）に、液
晶ポリエステルとしてロッドラン（ユニチカ社製）を５
重量％添加した。なお、液晶ポリエステルの溶融粘度
は、２５０℃下で９５ポイズ、２９０℃下で６０ポイズ
である。得られた混合樹脂の流動性試験、混合樹脂から
なる成形品の一点荷重試験及び落錘試験を行い、その結
果を表１に示した。各試験の実施方法は、下記の通りで
ある。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments. Example 1 Iupilone (P) having a melt viscosity of 980 poise (under 290 ° C.)
C, manufactured by Mitsubishi Engineering-Plastics Co., Ltd.)
% By weight. The melt viscosity of the liquid crystal polyester is 95 poise at 250 ° C. and 60 poise at 290 ° C. The obtained mixed resin was subjected to a fluidity test, a one-point load test and a drop weight test of a molded article made of the mixed resin, and the results are shown in Table 1. The method of conducting each test is as follows.
【００２３】（流動性試験）混合樹脂をゲートから射出
して、射出した混合樹脂のゲートからの流動長を測定す
る。この流動長を流動性の指標とする。(Fluidity test) The mixed resin is injected from the gate, and the flow length of the injected mixed resin from the gate is measured. This flow length is used as an index of liquidity.
【００２４】（一点荷重試験）混合樹脂を金型内に射出
することにより、図１の如き箱型の成形品１（幅５０ｍ
ｍ、長さ１２０ｍｍ、高さ１５ｍｍ）を形成する。得ら
れた成形品１の中央部を棒で荷重し、破壊された際の力
を測定する。(Single-point load test) A box-shaped molded product 1 (width 50 m) as shown in FIG.
m, length 120 mm, height 15 mm). The center of the obtained molded article 1 is loaded with a rod, and the force at the time of breaking is measured.
【００２５】（落錘試験）図１の成形品１の中央部に重
量３００ｇの重錘を落下させ、成形品１が破壊された際
の重錘の高さを測定する。なお、射出は、射出前の混合
樹脂の温度２９０℃、金型温度８０℃、射出速度６ｃｍ
3 ／秒、射出圧力１１００ｋｇｆ／ｃｍ2 の条件下で行
った。(Dropping weight test) A weight having a weight of 300 g is dropped on the center of the molded article 1 shown in FIG. 1, and the height of the weight when the molded article 1 is broken is measured. The injection was performed at a temperature of the mixed resin before injection of 290 ° C., a mold temperature of 80 ° C., and an injection speed of 6 cm.
The test was performed under the conditions of 3 / sec and an injection pressure of 1100 kgf / cm 2 .
【００２６】実施例２ ＰＣの代わりに、溶融粘度６００ポイズ（２５０℃下）
のスタイラックＡＢＳ（ＡＢＳ樹脂、旭化成社製）と５
重量％のタルクを使用し、液晶ポリエステルを３重量％
使用すること以外は、実施例１と同様にして混合樹脂を
得た。得られた混合樹脂の流動性試験、混合樹脂からな
る成形品の一点荷重試験及び落錘試験を実施例１と同様
にして行い、その結果を表１に示した。但し、射出は、
射出前の混合樹脂の温度２７０℃、金型温度７０℃、射
出速度６ｃｍ3 ／秒、射出圧力１０００ｋｇｆ／ｃｍ2
の条件下で行った。Example 2 Instead of PC, a melt viscosity of 600 poise (under 250 ° C.)
Styrac ABS (ABS resin, manufactured by Asahi Kasei Corporation) and 5
3% by weight of liquid crystal polyester using talc by weight
Except for using, a mixed resin was obtained in the same manner as in Example 1. A fluidity test, a one-point load test and a drop weight test of a molded article made of the mixed resin were performed in the same manner as in Example 1. The results are shown in Table 1. However, injection
The temperature of the mixed resin before injection is 270 ° C., the mold temperature is 70 ° C., the injection speed is 6 cm 3 / sec, and the injection pressure is 1000 kgf / cm 2.
Was performed under the following conditions.
【００２７】実施例３ ＰＣの代わりに、溶融粘度１９００ポイズ（２９０℃
下）のユピエース（ＰＰＥ、三菱エンジニアリングプラ
スチックス社製）を使用し、液晶ポリエステルを２０重
量％使用すること以外は、実施例１と同様にして混合樹
脂を得た。得られた混合樹脂の流動性試験、混合樹脂か
らなる成形品の一点荷重試験及び落錘試験を実施例１と
同様にして行い、その結果を表１に示した。但し、射出
は、射出前の混合樹脂の温度２９０℃、金型温度９０
℃、射出速度５ｃｍ3 ／秒、射出圧力１２００ｋｇｆ／
ｃｍ2 の条件下で行った。Example 3 Instead of PC, a melt viscosity of 1900 poise (290 ° C.)
A mixed resin was obtained in the same manner as in Example 1 except that Ipiace (PPE, manufactured by Mitsubishi Engineering-Plastics Co., Ltd.) was used and liquid crystal polyester was used in an amount of 20% by weight. A fluidity test, a one-point load test and a drop weight test of a molded article made of the mixed resin were performed in the same manner as in Example 1. The results are shown in Table 1. However, the injection was performed at a temperature of the mixed resin before injection of 290 ° C. and a mold temperature of 90 °.
° C, injection speed 5 cm 3 / sec, injection pressure 1200 kgf /
It was carried out under the conditions of cm 2.
【００２８】比較例１ 液晶ポリエステルを使用しないこと以外は、実施例１と
同様にして、流動性試験、混合樹脂からなる成形品の一
点荷重試験及び落錘試験を行い、その結果を表１に示し
た。Comparative Example 1 A fluidity test, a one-point load test and a drop weight test of a molded article made of a mixed resin were carried out in the same manner as in Example 1 except that no liquid crystal polyester was used. Indicated.
【００２９】[0029]
【表１】 [Table 1]
【００３０】表１から明らかなように、実施例１〜３
は、比較例１に比べて、流動性試験及び一点荷重試験が
向上し、落錘試験でも遜色のない結果が得られている。
従って、一点荷重試験及び落錘試験の結果から耐衝撃性
が犠牲になることなく、流動性試験の結果から成形性が
向上していることが判る。As is clear from Table 1, Examples 1 to 3
As compared with Comparative Example 1, the fluidity test and the one-point load test were improved, and a comparable result was obtained in the drop weight test.
Accordingly, the results of the one-point load test and the falling weight test show that the impact resistance is not sacrificed, and the results of the fluidity test show that the moldability is improved.
【００３１】実施例４ 実施例１〜３の混合樹脂を、厚さ０．３ｍｍの金属部品
（アルミニウム板）を配置した金型内に、それぞれの実
施例と同じ条件で射出して、図２（ａ）及び（ｂ）に示
す如き箱型の成形品を成形した。図２（ａ）及び（ｂ）
中、１は成形品、２は金属部品、３は混合樹脂を示す。
図２（ｂ）は、図２（ａ）のＸ部の概略拡大断面図であ
る。得られた成形品は、いずれも成形性に問題はなく、
また、耐衝撃性も良好であった。Example 4 The mixed resin of Examples 1 to 3 was injected into a mold in which a metal part (aluminum plate) having a thickness of 0.3 mm was arranged under the same conditions as in each example. A box-shaped molded article as shown in (a) and (b) was molded. FIG. 2 (a) and (b)
Among them, 1 is a molded product, 2 is a metal part, and 3 is a mixed resin.
FIG. 2B is a schematic enlarged sectional view of a part X in FIG. 2A. The obtained molded products have no problem in moldability,
The impact resistance was also good.
【００３２】[0032]
【発明の効果】本発明によれば、成形品を構成する熱可
塑性樹脂に液晶ポリエステルが混合されているため、軽
量及び衝撃強度が高レベルでバランスした成形品を得る
ことができる。According to the present invention, since the liquid crystal polyester is mixed with the thermoplastic resin constituting the molded product, it is possible to obtain a molded product in which the weight and impact strength are balanced at a high level.
【図１】実施例１〜３及び比較例１で製造した成形品の
概略斜視図である。FIG. 1 is a schematic perspective view of molded articles manufactured in Examples 1 to 3 and Comparative Example 1.
【図２】実施例４で製造した成形品の概略斜視図及び概
略拡大断面図である。FIG. 2 is a schematic perspective view and a schematic enlarged cross-sectional view of a molded product manufactured in Example 4.
【図３】従来のインモールド成形品の概略工程図及び問
題点を示す概略断面図である。FIG. 3 is a schematic process diagram of a conventional in-mold molded product and a schematic cross-sectional view showing a problem.
１、１４ 成形品 ２、１１ 金属部品 ３ 混合樹脂 １２ 金型 １３ 溶融した熱可塑性樹脂 １５ 熱可塑性樹脂 １６ 金属部品の変形 DESCRIPTION OF SYMBOLS 1, 14 Molded product 2, 11 Metal part 3 Mixed resin 12 Mold 13 Melted thermoplastic resin 15 Thermoplastic resin 16 Deformation of metal part
フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｂ２９Ｌ 31:34 Continued on the front page (51) Int.Cl. 6 Identification code FI B29L 31:34
Claims (3)
ールド成形品であって、熱可塑性樹脂が液晶ポリエステ
ルと、該液晶ポリエステルより溶融粘度の高い樹脂との
混合樹脂からなることを特徴とするインモールド成形
品。1. An in-mold molded product comprising a thermoplastic resin and a metal part, wherein the thermoplastic resin comprises a mixed resin of a liquid crystal polyester and a resin having a higher melt viscosity than the liquid crystal polyester. Molded products.
ステルの５〜１０倍の溶融粘度を有する請求項１記載の
インモールド成形品。2. The in-mold molded product according to claim 1, wherein the resin having a high melt viscosity has a melt viscosity 5 to 10 times that of the liquid crystal polyester.
厚さを有する請求項１又は２記載のインモールド成形
品。3. The in-mold molded product according to claim 1, wherein the metal component has a thickness of 0.1 to 0.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2973898A JPH11226991A (en) | 1998-02-12 | 1998-02-12 | In-mold molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2973898A JPH11226991A (en) | 1998-02-12 | 1998-02-12 | In-mold molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11226991A true JPH11226991A (en) | 1999-08-24 |
Family
ID=12284458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2973898A Withdrawn JPH11226991A (en) | 1998-02-12 | 1998-02-12 | In-mold molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11226991A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002317111A (en) * | 2001-04-20 | 2002-10-31 | Asahi Kasei Corp | Polyphenylene ether resin composition |
| JP2009280650A (en) * | 2008-05-20 | 2009-12-03 | Shin Kobe Electric Mach Co Ltd | Thermoplastic resin composition and thermoplastic resin molded article |
| EP2826613A4 (en) * | 2012-03-12 | 2015-11-11 | Omron Tateisi Electronics Co | Metal insert-molded article having sealability, electronic component having sealability and provided with said metal insert-molded article, and method for producing metal insert-molded article having sealability |
-
1998
- 1998-02-12 JP JP2973898A patent/JPH11226991A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002317111A (en) * | 2001-04-20 | 2002-10-31 | Asahi Kasei Corp | Polyphenylene ether resin composition |
| JP2009280650A (en) * | 2008-05-20 | 2009-12-03 | Shin Kobe Electric Mach Co Ltd | Thermoplastic resin composition and thermoplastic resin molded article |
| EP2826613A4 (en) * | 2012-03-12 | 2015-11-11 | Omron Tateisi Electronics Co | Metal insert-molded article having sealability, electronic component having sealability and provided with said metal insert-molded article, and method for producing metal insert-molded article having sealability |
| US9452555B2 (en) | 2012-03-12 | 2016-09-27 | Omron Corporation | Metal insert-molded article, a method for producing the same, and an electronic component |
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