JPH1180517A - Resin composition - Google Patents

Resin composition

Info

Publication number
JPH1180517A
JPH1180517A JP26271297A JP26271297A JPH1180517A JP H1180517 A JPH1180517 A JP H1180517A JP 26271297 A JP26271297 A JP 26271297A JP 26271297 A JP26271297 A JP 26271297A JP H1180517 A JPH1180517 A JP H1180517A
Authority
JP
Japan
Prior art keywords
liquid crystal
crystal polymer
resin composition
aluminum borate
resin
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.)
Abandoned
Application number
JP26271297A
Other languages
Japanese (ja)
Inventor
Yukitatsu Shirakawa
往立 白川
Shogo Ogawa
省吾 小川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shikoku Chemicals Corp
Original Assignee
Shikoku Chemicals Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shikoku Chemicals Corp filed Critical Shikoku Chemicals Corp
Priority to JP26271297A priority Critical patent/JPH1180517A/en
Publication of JPH1180517A publication Critical patent/JPH1180517A/en
Abandoned legal-status Critical Current

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  • Reinforced Plastic Materials (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain a resin composition excellent in electric insulation properties, fluidity of the resin when molding, and resonance characteristics, and useful for a precision machine member such as an optical pickup for an optical disc device by including a liquid crystal polymer and an aluminum borate whisker in a specific proportion. SOLUTION: This resin composition comprises (A) a liquid crystal polymer such as a polyester comprising the combination of an aromatic dicarboxylic acid, an aromatic diol, and an aromatic hydroxycarboxylic acid, and called as a thermotropic liquid crystal polymer, and (B) an aluminum borate whisker such as 9Al2 O3 .2B2 O3 in a proportion of 100 pts.wt. component A to 40-400 pts.wt. component B. The component B having 0.05-5 μm fiber diameter and 2-100 μm fiber length is suitable. The composition is useful for a precision machine member such as an inkjet nozzle of a printer.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、ビデオディスクプ
レーヤー、デジタルオーディオプレーヤー等の光ディス
ク装置に装着される光学式ピックアップのアクチュエー
ター、あるいはプリンタのインクジェットノズル等の精
密機器部材として有用な樹脂組成物に関するものであ
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition useful as an actuator of an optical pickup mounted on an optical disk device such as a video disk player or a digital audio player, or a precision device member such as an ink jet nozzle of a printer. It is.

【0002】[0002]

【従来の技術】光ディスク装置等における光学式ピック
アップは、一般に発光素子、受光素子、ミラー等の光学
素子等を固定する光フレームと、対物レンズ、対物レン
ズホルダーを光ディスクの動きに追従させるためのアク
チュエーター部と、このアクチュエーター部を保持し光
フレームとの光学路を形成するベースフレームとから構
成されている。〔例えば、実開平1−45315号公
報〕
2. Description of the Related Art An optical pickup in an optical disk device or the like generally includes an optical frame for fixing an optical element such as a light emitting element, a light receiving element, and a mirror, and an actuator for causing an objective lens and an objective lens holder to follow the movement of the optical disk. And a base frame that holds the actuator section and forms an optical path with the optical frame. [For example, Japanese Utility Model Laid-Open No. 1-45315]

【0003】特にアクチュエーター部は、寸法安定性が
要求されるほか常に20kHzまでの音に曝されている
ため、音による高次共振、即ちビビリによって、光ディ
スク上のデータを読み誤る虞が多分にある。この原因に
ついてはアクチュエーター部を構成する材料の内部損失
と比弾性率の不足と考えられており、その対策としてア
ルミニウムなどの金属ダイカスト製品を用い、アクチュ
エーター部を一体成形することにより、音による高次共
振を未然に防いでいた。
In particular, since the actuator section is required to have dimensional stability and is always exposed to sound up to 20 kHz, there is a possibility that data on the optical disk may be erroneously read due to higher-order resonance due to sound, that is, chatter. . The cause of this is considered to be the internal loss of the material constituting the actuator part and the lack of specific elastic modulus.As a countermeasure, using a metal die-cast product such as aluminum and integrally molding the actuator part, high order The resonance was prevented beforehand.

【0004】近年、光学式ピックアップの軽量化、低コ
スト化が進み、金属を合成樹脂に代替する試みがなされ
ている。従来、これらの精密部品に応用されている樹脂
組成物として、ポリフェニレンサルファイド樹脂(以下
PPS樹脂という)を用い、これに結晶質繊維状充填剤
を配合したものであり(例えば、特開平5−26298
2号公報)、PPS樹脂に充填剤を添加、混合すること
により高弾性化し、共振周波数帯域の高い成形品が得ら
れるものである。しかしながら、光ピックアップを高性
能化するに伴って、共振周波数をさらに高周波側にシフ
トさせる場合、PPS樹脂では内部損失の改善が期待で
きないため、高性能光ピックアップ部品の材料としては
不十分なものであった。
In recent years, the weight and cost of optical pickups have been reduced, and attempts have been made to replace metal with synthetic resin. Conventionally, polyphenylene sulfide resin (hereinafter, referred to as PPS resin) is used as a resin composition applied to these precision parts, and a crystalline fibrous filler is blended with the resin composition (for example, see Japanese Patent Application Laid-Open No. 5-26298).
No. 2) and a filler is added to and mixed with the PPS resin to increase the elasticity and to obtain a molded product having a high resonance frequency band. However, when the resonance frequency is further shifted to a higher frequency side as the performance of the optical pickup is improved, the PPS resin cannot be expected to improve the internal loss. there were.

【0005】[0005]

【発明の解決しようとする課題】この発明は、内部損失
の高い樹脂を用い且つその弾性率を向上させ、従来の熱
可塑性樹脂組成物では為し得なかったより高性能な電気
絶縁性を有し、光ディスク装置の光学式ピックアップ等
の精密機械部材として利用可能な樹脂組成物を提供する
ことにある。
SUMMARY OF THE INVENTION The present invention uses a resin having a high internal loss and improves the elasticity of the resin, and has a higher-performance electric insulating property which cannot be achieved by a conventional thermoplastic resin composition. Another object of the present invention is to provide a resin composition that can be used as a precision mechanical member such as an optical pickup of an optical disk device.

【0006】[0006]

【課題を解決するための手段】本発明者等は、所期の目
的を達成するため鋭意試験研究を重ねた結果、液晶ポリ
マーとホウ酸アルミニウムウイスカを必須成分として含
み、液晶ポリマー100重量部に対しホウ酸アルミニウ
ムウイスカを40〜400重量部の割合で配合したこと
により、本発明を完遂するに至った。
Means for Solving the Problems The inventors of the present invention have conducted intensive tests and studies to achieve the intended purpose. As a result, the present inventors have found that a liquid crystal polymer and aluminum borate whiskers are contained as essential components, and 100 parts by weight of the liquid crystal polymer is contained. On the other hand, the present invention was completed by blending aluminum borate whiskers in a ratio of 40 to 400 parts by weight.

【0007】[0007]

【発明の実施の形態】本発明の実施に適する液晶ポリマ
ーの代表的なものとしては、はサーモトロピック液晶ポ
リマーと呼ばれるポリエステルであり、 (1)芳香族ジカルボン酸と芳香族ジオールと芳香族ヒ
ドロキシカルボン酸との組み合わせからなるもの (2)異種の芳香族ヒドロキシカルボン酸からなるもの (3)芳香族ジカルボン酸と核置換芳香族ジオールとの
組み合わせからなるもの (4)ポリエチレンテレフタレート等のポリエステルに
芳香族ヒドロキシカルボン酸を反応させたもの 等が挙げられ、400℃以下の温度で異方性溶融体を形
成し、高い内部損失を有すると共に、溶融流動性が極め
て優れているため、0.1〜0.3mm程度の薄肉成形
品を容易に得ることができる。なお、これらの芳香族カ
ルボン酸、芳香族ジオール及び芳香族ヒドロキシカルボ
ン酸の代わりにそれらのエステル形成性誘導体が使用さ
れることもある。
DESCRIPTION OF THE PREFERRED EMBODIMENTS A typical example of a liquid crystal polymer suitable for carrying out the present invention is a polyester called a thermotropic liquid crystal polymer. (1) Aromatic dicarboxylic acid, aromatic diol and aromatic hydroxycarboxylic acid (2) Combination of different aromatic hydroxycarboxylic acids (3) Combination of aromatic dicarboxylic acid and nucleus-substituted aromatic diol (4) Polyester such as polyethylene terephthalate is aromatic Hydroxycarboxylic acid is reacted. The anisotropic melt is formed at a temperature of 400 ° C. or less, and has a high internal loss and extremely excellent melt fluidity. A thin molded product of about 3 mm can be easily obtained. Incidentally, ester-forming derivatives thereof may be used in place of these aromatic carboxylic acids, aromatic diols and aromatic hydroxycarboxylic acids.

【0008】本発明の樹脂組成物に用いられるホウ酸ア
ルミニウムウイスカとしては、9Al2 3 ・2B2
3 あるいは2Al2 3 ・B2 3 の化学組成を持つも
のが代表的であり、これらホウ酸アルミニウムウイスカ
の形状についての特定はないが、繊維径0.05〜5μ
m、繊維長2〜100μmのものが適している。さら
に、ホウ酸アルミニウムウイスカと樹脂との相溶性、接
着性を高めるために、表面をシランカップリング剤等で
表面処理したホウ酸アルミニウムウイスカを用いても差
し支えない。
The aluminum borate whiskers used in the resin composition of the present invention include 9Al 2 O 3 .2B 2 O
3 or 2Al 2 O 3 · B those having the chemical composition of the 2 O 3 is a representative, no specific shape of these aluminum borate whiskers, but fiber diameter 0.05~5μ
m and a fiber length of 2 to 100 μm are suitable. Furthermore, in order to increase the compatibility and adhesion between the aluminum borate whisker and the resin, an aluminum borate whisker whose surface is treated with a silane coupling agent or the like may be used.

【0009】本発明における樹脂組成物は、液晶ポリマ
ー100重量部に対し、ホウ酸アルミニウムウイスカを
40〜400重量部の割合で配合すべきであり、好まし
くは液晶ポリマー100重量部に対し、ホウ酸アルミニ
ウムウイスカを重量比で70〜150重量部の範囲に調
整すべきである。両成分の配合割合において、ホウ酸ア
ルミニウムウイスカの使用量が400重量部を上廻ると
樹脂組成物の成形性が悪化すると共に、樹脂組成物が重
くなり実用に適さない。またホウ酸アルミニウムウイス
カの使用量が40重量部を下廻ると樹脂の弾性率が低下
して、光学式ピックアップ部品の場合、音による共振ト
ラブルを回避し難く実用に適さない。
The resin composition of the present invention should contain 40 to 400 parts by weight of aluminum borate whiskers with respect to 100 parts by weight of the liquid crystal polymer, and preferably 100 parts by weight of the liquid crystal polymer. The aluminum whiskers should be adjusted in the range of 70 to 150 parts by weight. If the amount of the aluminum borate whisker exceeds 400 parts by weight in the mixing ratio of both components, the moldability of the resin composition deteriorates, and the resin composition becomes heavy and unsuitable for practical use. When the amount of the aluminum borate whisker is less than 40 parts by weight, the elastic modulus of the resin decreases, and in the case of an optical pickup component, resonance trouble due to sound is difficult to avoid, which is not suitable for practical use.

【0010】なお、液晶ポリマーにホウ酸アルミニウム
ウィスカ以外の充填剤、例えば炭素繊維、ガラス繊維等
の長繊維、チタン酸カリウムウィスカ、炭酸カルシウ
ム、塩基性硫酸マグネシウム、炭化珪素、クリソタイ
ル、ワラスナイト等の無機質繊維を用いた場合、炭素繊
維を除いて何れも高剛性化を図るために多量に配合する
ことを余儀なくされ、成形性の悪化並びに成形品の機械
的強度を低下させる要因となる。なお、炭素繊維を用い
た場合、弾性率は高いけれども樹脂組成物の電気的導電
性が高くなるため、微小電流のリークによって電気的な
誤動作が生じることから機構上絶縁性が要求される光ピ
ックアップ部品等には適さないものであった。
In addition, fillers other than aluminum borate whiskers, such as long fibers such as carbon fiber and glass fiber, potassium titanate whiskers, calcium carbonate, basic magnesium sulfate, silicon carbide, chrysotile, and wollastonite are added to the liquid crystal polymer. When fibers are used, they must be compounded in large amounts in order to increase rigidity, except for carbon fibers, which causes deterioration of moldability and lowers mechanical strength of molded products. When carbon fiber is used, the optical pickup has high elasticity, but the electrical conductivity of the resin composition is high, and an electrical malfunction occurs due to leakage of a small current. It was not suitable for parts and the like.

【0011】本発明の樹脂組成物には、その性能を低下
させず、樹脂組成物の2重量%を超えない範囲で酸化防
止剤、紫外線吸収剤、滑剤、可塑剤等の安定化剤を配合
することができる。
The resin composition of the present invention contains a stabilizer such as an antioxidant, an ultraviolet absorber, a lubricant and a plasticizer within a range not exceeding 2% by weight of the resin composition without deteriorating its performance. can do.

【0012】液晶ポリマーとホウ酸アルミニウムウイス
カを混練りするには、公知の方法を用いて行うことがで
きる。例えば、リボンブレンダー、タンブラーミキサ、
ヘンシェルミキサ等の混合機を使用して均一に混合した
後に溶融混練するか、あるいはバンバリミキサ、スクリ
ュー混練機等を用いて混合、混練を同時に行うこともで
きる。混練によりペレットを成形し、このペレットを使
用して各種の成形法、通常は射出成形法によって成形品
を造ることができる。
The kneading of the liquid crystal polymer and the aluminum borate whisker can be performed by a known method. For example, ribbon blender, tumbler mixer,
The mixture may be uniformly mixed using a mixer such as a Henschel mixer and then melt-kneaded, or mixed and kneaded simultaneously using a Banbury mixer, a screw kneader, or the like. A pellet can be formed by kneading, and a molded article can be produced using the pellet by various molding methods, usually an injection molding method.

【0013】[0013]

【実施例】以下、本発明を実施例及び比較例に基づいて
具体的に説明する。なお、実施例及び比較例において使
用する原材料は次のとおりである。 (1)液晶ポリマー(ユニチカ製、商品名〔ロッドラン
LC−5000〕) (2)カーボン繊維(東邦レーヨン社製、商品名〔ベス
ファイトHTA−C6−SR〕) (3)ホウ酸アルミニウムウイスカ(四国化成工業製、
商品名〔アルボレックスYS3A〕) (4)チタン酸カリウムウイスカ(大塚化学製、商品名
〔ティスモ〕)
The present invention will be specifically described below based on examples and comparative examples. In addition, the raw materials used in Examples and Comparative Examples are as follows. (1) Liquid crystal polymer (manufactured by Unitika, trade name [Rodrun LC-5000]) (2) Carbon fiber (manufactured by Toho Rayon Co., Ltd., trade name [Vesfight HTA-C6-SR]) (3) Aluminum borate whisker (Shikoku) Chemical industry,
Product name [Arbolex YS3A]) (4) Potassium titanate whisker (Otsuka Chemical, trade name [Tismo])

【0014】〔実施例1〜3〕液晶ポリマーと二軸押出
機〔東芝機械(株)製、TEM35−B〕を用いて混練
し、サイドフィードによりホウ酸アルミニウムウイスカ
を投入し、290℃で溶融押し出ししてペレット化し
た。このようにして得られたペレットを型締め圧30ト
ンの射出成形機を用いて試験片およびピックアップ部品
をそれぞれ作製した。試験片については、曲げ試験(A
STM D−790に準拠)と体積固有抵抗値(AST
M D−257準拠)を行い、弾性率及び電気絶縁性の
評価試験を行った。ピックアップ部品については、ピッ
クアップのアクチュエーターを実際にCDプレーヤーに
組み込み、長期作動試験と共に共振周波数測定器にて共
振周波数及び共振ピークを計測し、さらに高周波環境の
変化において作動させる性能試験を行った。これらの試
験結果は表1に示したとおりであり、何れの実施例にお
いても良好な電気的絶縁性、共振特性及び成形性を有す
るものであった。
[Examples 1 to 3] A liquid crystal polymer and a twin-screw extruder (manufactured by Toshiba Machine Co., Ltd., TEM35-B) were kneaded, and aluminum borate whiskers were charged by side feed and melted at 290 ° C. Extruded and pelletized. A test piece and a pickup component were produced from the pellet thus obtained using an injection molding machine having a mold clamping pressure of 30 tons. For the test piece, the bending test (A
STM D-790) and volume resistivity (AST
MD-257), and an evaluation test for elastic modulus and electrical insulation was performed. For the pickup components, the pickup actuator was actually incorporated into a CD player, and a long-term operation test was performed, and a resonance frequency and a resonance peak were measured by a resonance frequency measuring device, and further, a performance test was performed in which the device was operated in a change in a high-frequency environment. The results of these tests are as shown in Table 1, and all Examples had good electrical insulation, resonance characteristics and moldability.

【0015】〔比較例1〜3〕液晶ポリマーにカーボン
繊維またはチタン酸カリウムウイスカを配合し、実施例
1〜3と同様に押出ペレット化し、夫々の試験片とピッ
クアップ部品を作製して評価したところ、その結果は表
1に示したとおりであった。比較例中、カーボン繊維を
配合したものは弾性率が高く、共振周波数や共振ピーク
も良好な値を示しているが、体積固有抵抗値が小さく、
導電性を示しているため、長期信頼性試験時にピックア
ップ部品としての誤動作が頻繁に発生した。また、チタ
ン酸カリウムウイスカを配合したものは弾性率が小さ
く、共振周波数値や共振ピーク値が最も悪い結果を示し
た。
[Comparative Examples 1 to 3] Carbon fibers or potassium titanate whiskers were mixed with a liquid crystal polymer, extruded into pellets in the same manner as in Examples 1 to 3, and test pieces and pickup parts were prepared and evaluated. The results were as shown in Table 1. Among the comparative examples, those containing carbon fiber have a high elastic modulus and a good value of the resonance frequency and the resonance peak, but the volume specific resistance is small,
Due to the conductivity, erroneous operation as a pickup component frequently occurred during a long-term reliability test. Further, those containing potassium titanate whiskers had a low elastic modulus, and showed the worst results in the resonance frequency value and the resonance peak value.

【0016】[0016]

【表1】 [Table 1]

【0017】〔実施例4〜5〕液晶ポリマーとホウ酸ア
ルミニウムウイスカを表2に示した割合で配合し、実施
例1〜3と同様に押出ペレット化し、夫々の試験片とピ
ックアップ部品を作製して評価したところ、その結果は
表2に示したとおりであり、何れも良好な電気的絶縁
性、共振特性及び成形性を有するものであった。
[Examples 4 and 5] A liquid crystal polymer and aluminum borate whiskers were blended at the ratios shown in Table 2 and extruded into pellets in the same manner as in Examples 1 to 3 to produce test pieces and pickup parts. As a result, the results were as shown in Table 2, and all of them had good electrical insulation, resonance characteristics and moldability.

【0018】〔比較例4〜5〕液晶ポリマーとホウ酸ア
ルミニウムウイスカを表2に示した割合で配合し、実施
例1〜3と同様に押出ペレット化し、夫々の試験片とピ
ックアップ部品を作製して評価したところ、その結果は
表2に示したとおりであり、液晶ポリマーに対するホウ
酸アルミニウムウィスカの配合量が多過ぎると、成形性
が悪化し、逆に少な過ぎると、共振特性が悪化する等、
共に長期作動試験に悪い結果を残すものであった。
[Comparative Examples 4 and 5] A liquid crystal polymer and aluminum borate whiskers were blended at the ratios shown in Table 2 and extruded into pellets in the same manner as in Examples 1 to 3 to produce test pieces and pickup parts. The results are as shown in Table 2. When the amount of the aluminum borate whisker to the liquid crystal polymer is too large, the moldability deteriorates. On the contrary, when the amount is too small, the resonance characteristics deteriorate. ,
Both had bad results in long-term operation tests.

【0019】[0019]

【表2】 [Table 2]

【0020】[0020]

【発明の効果】本発明の樹脂組成物によると、電気的絶
縁性、成形時の樹脂の流動性並びに共振特性に優れてい
るので、光ディスク装置の光学式ピックアップ部品やプ
リンタのインクジェットノズル等の精密部品用として、
信頼性の高い樹脂組成物を提供することができる。
According to the resin composition of the present invention, it is excellent in electrical insulation, resin fluidity during molding, and resonance characteristics. For parts,
A highly reliable resin composition can be provided.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 液晶ポリマーとホウ酸アルミニウムウイ
スカを必須成分として含み、液晶ポリマー100重量部
に対しホウ酸アルミニウムウイスカを40〜400重量
部の割合で配合したことを特徴とする樹脂組成物。
1. A resin composition comprising a liquid crystal polymer and aluminum borate whiskers as essential components, and comprising 40 to 400 parts by weight of aluminum borate whiskers based on 100 parts by weight of the liquid crystal polymer.
JP26271297A 1997-09-09 1997-09-09 Resin composition Abandoned JPH1180517A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26271297A JPH1180517A (en) 1997-09-09 1997-09-09 Resin composition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26271297A JPH1180517A (en) 1997-09-09 1997-09-09 Resin composition

Publications (1)

Publication Number Publication Date
JPH1180517A true JPH1180517A (en) 1999-03-26

Family

ID=17379552

Family Applications (1)

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JP26271297A Abandoned JPH1180517A (en) 1997-09-09 1997-09-09 Resin composition

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US7985351B2 (en) 2004-08-03 2011-07-26 Sumitomo Chemical Co., Ltd. Liquid-crystal polyester resin composition
KR101244499B1 (en) * 2004-08-03 2013-03-18 엔티엔 가부시키가이샤 Liquid-crystal polyester resin composition
JP2006045298A (en) * 2004-08-03 2006-02-16 Ntn Corp Liquid crystal polyester composition
US11725095B2 (en) 2013-03-13 2023-08-15 Ticona Llc Compact camera module
US10941275B2 (en) 2013-03-13 2021-03-09 Ticona Llc Compact camera module
US10829634B2 (en) 2017-12-05 2020-11-10 Ticona Llc Aromatic polymer composition for use in a camera module
US11725106B2 (en) 2017-12-05 2023-08-15 Ticona Llc Aromatic polymer composition for use in a camera module
WO2020095997A1 (en) * 2018-11-09 2020-05-14 住友化学株式会社 Liquid crystal polyester resin composition and molded article
JPWO2020095997A1 (en) * 2018-11-09 2021-09-24 住友化学株式会社 Liquid crystal polyester resin composition and molded product
US11715579B2 (en) 2020-02-26 2023-08-01 Ticona Llc Electronic device
US11702539B2 (en) 2020-02-26 2023-07-18 Ticona Llc Polymer composition for an electronic device
US11729908B2 (en) 2020-02-26 2023-08-15 Ticona Llc Circuit structure
US11728065B2 (en) 2020-07-28 2023-08-15 Ticona Llc Molded interconnect device

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