JPH0669014A - Plastic magnet composition - Google Patents
Plastic magnet compositionInfo
- Publication number
- JPH0669014A JPH0669014A JP4223045A JP22304592A JPH0669014A JP H0669014 A JPH0669014 A JP H0669014A JP 4223045 A JP4223045 A JP 4223045A JP 22304592 A JP22304592 A JP 22304592A JP H0669014 A JPH0669014 A JP H0669014A
- Authority
- JP
- Japan
- Prior art keywords
- exceed
- ethylene
- weight
- plastic magnet
- acrylate copolymer
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/08—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/083—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together in a bonding agent
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ＯＡ機器、マグネット
ローラ等に使用されるプラスチック磁石組成物に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic magnet composition used for office automation equipment, magnet rollers and the like.
【０００２】[0002]
【従来の技術】従来より、プラスチック磁石は寸法精度
が良く、耐熱性も比較的良好な事からポリアミド樹脂を
バインダーとしたプラスチック磁石組成物が使用される
事は知られている。また樹脂を含有させることで射出成
形が可能となり、従来２部品を接着剤で接着する事で作
成されていた部品を、シャフト等を金型にインサートす
るインサート成形により一体成形する事で、低コスト化
が可能になる事も知られている。2. Description of the Related Art Conventionally, it has been known that a plastic magnet composition containing a polyamide resin as a binder is used because a plastic magnet has good dimensional accuracy and relatively good heat resistance. In addition, injection molding is possible by containing a resin, and parts that were previously made by bonding two parts with an adhesive are integrally molded by insert molding that inserts a shaft etc. into a mold, resulting in low cost. It is also known that it can be converted.
【０００３】しかしながら、ポリアミド樹脂をバインダ
ーとしたプラスチック磁石を用いた場合には、シャフト
等の金属とプラスチック磁石を一体成形する場合に金属
とプラスチック磁石の線膨張係数が大きく異なるため、
インサート成形後の成形品にヒートショックを加えると
成形品にクラックが入る(耐ヒートショック性が悪い)と
いう欠点があり、ＯＡ機器、マグネットローラ等には使
用できなかった。また、ポリプロピレン樹脂のみをバイ
ンダーに用いたプラスチック磁石も知られている。この
プラスチック磁石の場合は、マグネットローラ等で問題
になる耐トナー性が良いという長所はあるものの、ポリ
アミド樹脂の場合と同様に耐ヒートショック性が悪いた
め、結局ＯＡ機器、マグネットローラ等には使用できな
かった。However, when a plastic magnet having a polyamide resin as a binder is used, the linear expansion coefficient of the metal and the plastic magnet is greatly different when integrally molding the metal such as the shaft and the plastic magnet.
When a heat shock is applied to the molded product after insert molding, there is a defect that the molded product is cracked (poor heat shock resistance), and it cannot be used for OA equipment, magnet roller and the like. A plastic magnet using only a polypropylene resin as a binder is also known. Although this plastic magnet has the advantage of good toner resistance, which is a problem with magnet rollers, etc., it has poor heat shock resistance as well as polyamide resin, so it is eventually used for OA equipment, magnet rollers, etc. could not.
【０００４】この耐ヒートショック性を改良するため
に、エチレン−エチルアクリレート共重合体をバインダ
ーに用いることは考えられ、特公昭54―13993号公報に
記載されている。しかしながら、この場合もポリアミド
樹脂、ポリプロピレン樹脂の場合より耐ヒートショック
性に勝るものの、長期間経過した場合にはやはり樹脂の
劣化によりクラックが生じてしまう。またさらに今度は
マグネットローラ等で問題になる耐トナー性が悪いとい
う問題も生じるため、これもマグネットローラ等には使
用できなかった。さらに特公昭54―13993号公報の請求
項第２項では耐熱性向上のため、エチレン−エチルアク
リレート共重合体を用いた樹脂磁石にポリプロピレン樹
脂を添加したものが記載されているが、ポリプロピレン
樹脂の添加は耐ヒートショック性を悪くしてしまう。ま
た、特公昭54―13993号公報に記載のように異方性の強
磁性粉を用いているプラスチック磁石では、成形後に均
一な多極着磁（２０極以上）を行うことが不可能である
ために、マグネットローラーのように精密多極着磁を行
うものには使用できなかった。In order to improve the heat shock resistance, it is considered to use an ethylene-ethyl acrylate copolymer as a binder, which is described in Japanese Patent Publication No. 54-13993. However, even in this case, although the heat shock resistance is superior to the case of the polyamide resin and the polypropylene resin, cracks are also generated due to deterioration of the resin after a long time has passed. Further, this time, there is a problem that the toner resistance is poor, which is a problem with magnet rollers and the like, so that this cannot be used for magnet rollers and the like. Further, in claim 2 of Japanese Patent Publication No. 54-13993, in order to improve heat resistance, a resin magnet using an ethylene-ethyl acrylate copolymer added with a polypropylene resin is described. Addition deteriorates heat shock resistance. Further, as described in Japanese Patent Publication No. 54-13993, it is impossible to perform uniform multi-pole magnetization (20 poles or more) after molding with a plastic magnet using anisotropic ferromagnetic powder. For this reason, it cannot be used for a magnet roller such as a magnet roller that performs precise multi-pole magnetization.
【０００５】さらにＯＡ機器、マグネットローラ等のプ
ラスチック磁石では、体積抵抗率、比誘電率等の電気特
性をある範囲に入れることが必要な場合があるが、従来
技術によるプラスチック磁石では、強磁性粉末と樹脂の
比率で体積抵抗率、比誘電率等の電気特性は決ってしま
うので、電気特性をコントロールするためには、強磁性
粉末と樹脂の比率を変えねばならない。すると必然的に
磁力特性が変化してしまうので磁力特性を維持したまま
で、電気特性をコントロールすることはできなかった。Further, in the case of plastic magnets such as office automation equipment and magnet rollers, it may be necessary to set the electrical characteristics such as volume resistivity and relative permittivity within a certain range. Since the electrical properties such as volume resistivity and relative permittivity are determined by the ratio of the resin and the resin, the ratio of the ferromagnetic powder and the resin must be changed in order to control the electrical properties. Then, the magnetic characteristics inevitably change, so it was not possible to control the electrical characteristics while maintaining the magnetic characteristics.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、金属との一
体成形を行う際、耐ヒートショック性に優れ、かつ耐ト
ナー性に優れる成形品を与え、かつその成形品の磁力特
性を維持したままで、電気特性をコントロールすること
を可能ならしめ、さらに多極着磁も可能な材料を得んと
して研究した結果、バインダーとしてエチレン−エチル
アクリレート共重合体を用いる事で耐ヒートショック性
に優れ、またポリプロピレン樹脂を併用する事で耐トナ
ー性が向上することを見い出した。また、それに重金属
不活性剤を添加することにより、長期間における耐ヒー
トショック性を得ることができ、またさらに検討を進め
た結果、エチレン−エチルアクリレート共重合体とポリ
プロピレン樹脂の比率を変える事で電気特性をコントロ
ールする事が可能になるとの知見を得た。そしてさらに
これらの知見に基づき種々検討を進めた結果、本発明を
完成するに至ったものである。DISCLOSURE OF THE INVENTION The present invention provides a molded product having excellent heat shock resistance and toner resistance when integrally molded with a metal, and maintains the magnetic properties of the molded product. Moreover, as a result of researching to obtain a material that can control electric characteristics and that can also be magnetized with multiple poles, as a result of using ethylene-ethyl acrylate copolymer as a binder, it has excellent heat shock resistance. It was also found that the toner resistance is improved by using a polypropylene resin together. Also, by adding a heavy metal deactivator to it, it is possible to obtain heat shock resistance for a long period of time, and as a result of further study, it was possible to change the ratio of ethylene-ethyl acrylate copolymer and polypropylene resin. We have found that it becomes possible to control the electrical characteristics. As a result of further various investigations based on these findings, the present invention has been completed.
【０００７】[0007]
【課題を解決するための手段】本発明は等方性強磁性粉
末５０重量％以上８０重量％未満と、メルトインデック
スが５以上のエチレン−エチルアクリレート共重合体を
５重量％以上とメルトインデックスが５以上のポリプロ
ピレン樹脂を２重量％以上２５重量部以下を含有し、か
つその２つの樹脂の合計が２０重量％以上５０重量％以
下である組成を特徴とするプラスチック磁石組成物であ
る。According to the present invention, isotropic ferromagnetic powder is contained in an amount of 50% by weight or more and less than 80% by weight, an ethylene-ethyl acrylate copolymer having a melt index of 5 or more is 5% by weight or more, and a melt index is 5 or more. The plastic magnet composition is characterized by containing 2% by weight or more and 25% by weight or less of the polypropylene resin, and the total of the two resins is 20% by weight or more and 50% by weight or less.
【０００８】本発明において等方性強磁性粉末としては
形状が数ミクロン程度に粉砕可能な等方性の強磁性材料
であれば特に制限を受けず、例えばＭnＦｅ2Ｏ3 ［Ｍは
Ｂａ，Ｓｒ，Ｃａ，Ｍｇ，Ｚｎ，Ｐｂの１種または２種
以上の元素であり、ｎは４．８〜６．２である］よりな
るフェライト磁性粉末、ネオジウム−鉄−硼素磁性粉
末、アルニコ磁性粉末等が例示される。必要なのは等方
性の磁性粉末であるということであり、異方性の磁性粉
末を用いると成形後の均一な多極着磁が不可能になる。
またこれらの磁性粉末はシラン系カップリング剤、チ
タネート系カップリング剤などで表面処理をされていて
も構わない。In the present invention, the isotropic ferromagnetic powder is not particularly limited as long as it is an isotropic ferromagnetic material whose shape can be crushed to about several microns. For example, MnFe 2 O 3 [M is Ba, Sr, Ca. , Mg, Zn, Pb, one or two or more elements, and n is 4.8 to 6.2], and examples thereof include a ferrite magnetic powder, a neodymium-iron-boron magnetic powder, and an alnico magnetic powder. To be done. What is required is an isotropic magnetic powder, and if an anisotropic magnetic powder is used, uniform multipole magnetization after molding becomes impossible.
Further, these magnetic powders may be surface-treated with a silane coupling agent, a titanate coupling agent, or the like.
【０００９】バインダーとして用いるエチレン−エチル
アクリレート共重合体のメルトインデックスはＡＳＴＭ
Ｄ１２３８の試験方法により５以上が必要である。これ
は５以下のものを用いると磁性粉末の混練性、射出成形
性が極めて悪く、磁気特性も低下するためである。また
その含有量としては５重量％以上が望ましい。これは５
重量％を下回る場合、耐ヒートショック性向上の効果が
ほとんどなくなるためである。また、エチルアクリレー
トの含有量は１０〜４０重量％が望ましい。これは、１
０重量％未満だと共重合体の結晶化度が高すぎ、４０重
量％を越えると得られるプラスチック磁石の強度が低く
なりすぎる。The melt index of ethylene-ethyl acrylate copolymer used as a binder is ASTM
5 or more is required according to the test method of D1238. This is because the kneadability and injection moldability of the magnetic powder are extremely poor and the magnetic properties are deteriorated when the amount of 5 or less is used. The content is preferably 5% by weight or more. This is 5
This is because when it is less than wt%, the effect of improving the heat shock resistance is almost lost. Further, the content of ethyl acrylate is preferably 10 to 40% by weight. This is 1
If it is less than 0% by weight, the crystallinity of the copolymer will be too high, and if it exceeds 40% by weight, the strength of the obtained plastic magnet will be too low.
【００１０】本発明において使用されるポリプロピレン
樹脂は、プロピレン単独重合体のみに制限されず、プロ
ピレン−エチレンブロック共重合体、プロピレン−エチ
レンランダム共重合体、プロピレン−ブテン−１ブロッ
クまたはランダム共重合体等のプロピレンと他のオレフ
ィンとの共重合体であっても構わない。また、ポリプロ
ピレン樹脂のメルトインデックスはエチレン−エチルア
クリレート共重合体同様、ＡＳＴＭＤ１２３８の試験方
法により５以上が必要である。これもやはり５以下のも
のを用いると磁性粉末の混練性、射出成形性が極めて悪
くなり、磁気特性も低下するためである。またその含有
量としては２重量％以上、３５重量％以下が望ましい。
これは２重量％を下回ると耐トナー性向上の効果が少な
く、３５重量％を越えると耐ヒートショック性が悪くな
るためである。The polypropylene resin used in the present invention is not limited to a propylene homopolymer, but includes a propylene-ethylene block copolymer, a propylene-ethylene random copolymer, a propylene-butene-1 block or a random copolymer. It may be a copolymer of propylene with other olefins. Further, the melt index of the polypropylene resin, like the ethylene-ethyl acrylate copolymer, needs to be 5 or more according to the test method of ASTM D1238. This is also because the kneadability and injection moldability of the magnetic powder are extremely deteriorated and the magnetic properties are also deteriorated when 5 or less is used. Further, the content is preferably 2% by weight or more and 35% by weight or less.
This is because if it is less than 2% by weight, the effect of improving the toner resistance is small, and if it exceeds 35% by weight, the heat shock resistance is deteriorated.
【００１１】エチレン−エチルアクリレート共重合体の
含有量の上限は、ポリプロピレン樹脂と合わせた合計の
含有量で制限を受ける。すなわち、エチレン−エチルア
クリレート共重合体とポリプロピレン樹脂の合計含有量
は２０重量％以上、５０重量％以下が望ましい。これは
２０重量％を下回る場合、成形性がやや落ちる上に樹脂
分が少ないために長期間のヒートショック試験に耐えら
れなくなる。さらに５重量％を下回ると射出成形性が極
めて悪くなる。また５０重量％を越えると、組成物中の
磁性粉末の割合が低下するため成形物の磁力が低下が著
しく、工業的に好適な材料とならない。The upper limit of the content of ethylene-ethyl acrylate copolymer is limited by the total content including the polypropylene resin. That is, the total content of the ethylene-ethyl acrylate copolymer and the polypropylene resin is preferably 20% by weight or more and 50% by weight or less. When it is less than 20% by weight, the moldability is slightly lowered and the resin content is small, so that it cannot withstand a long-term heat shock test. Further, if it is less than 5% by weight, the injection moldability becomes extremely poor. On the other hand, if it exceeds 50% by weight, the ratio of the magnetic powder in the composition decreases, and the magnetic force of the molded product remarkably decreases, so that the material is not industrially suitable.
【００１２】本発明はエチレン−エチルアクリレート共
重合体及びポリプロピレン樹脂といったポリオレフィン
系の樹脂と、金属合金あるいは金属酸化物からなる磁性
粉末を配合することによる、ポリオレフィンの分解によ
る物性の劣化を防ぐために重金属不活性剤を配合しても
構わない。その重金属不活性剤としては、シュウ酸誘導
体系、サリチル酸誘導体系、ヒドラジド誘導体系などが
例示される。しかし、その配合量は樹脂の配合量に対し
て１重量％以上、２０重量％以下である必要があり、１
重量％以下であると効果がなく、２０重量％を越えると
成形品の機械的強度が低下するためである。According to the present invention, a polyolefin resin such as an ethylene-ethyl acrylate copolymer and a polypropylene resin is mixed with a magnetic powder composed of a metal alloy or a metal oxide to prevent deterioration of physical properties due to decomposition of the polyolefin. You may mix | blend an inactive agent. Examples of the heavy metal deactivator include oxalic acid derivative type, salicylic acid derivative type and hydrazide derivative type. However, the blending amount must be 1% by weight or more and 20% by weight or less with respect to the resin blending amount.
This is because if it is less than 20% by weight, no effect is obtained, and if it exceeds 20% by weight, the mechanical strength of the molded product is reduced.
【００１３】またさらに流動性を向上させるために、エ
ステル類、石鹸類の滑剤を併用しても構わない。しかし
ながらその量は磁性粉末の配合量に対して０．１重量％
以上３重量％以下が望ましい。これは０．１重量％を下
回ると射出成形時の流動性向上効果が少なく、３重量％
を越えると成形品の機械的強度が低下するためである。
また、特公昭54―13993号公報の特許請求第２項におい
て、エチレン−エチルアクリレート共重合体を用いた樹
脂磁石にポリプロピレン樹脂を添加したものについても
記述してあるが、これはただ単に耐熱性をあげるために
添加しただけのものである。本発明におけるポリプロピ
レン樹脂の添加は耐トナー性の向上および体積抵抗率の
コントロールのために添加されるもので、その添加目的
は特公昭54―13993号公報記載のものとは全く異なるも
のであることを明記しておく。Further, in order to further improve the fluidity, lubricants such as esters and soaps may be used together. However, the amount is 0.1% by weight with respect to the amount of the magnetic powder compounded.
Above 3 wt% is desirable. If it is less than 0.1% by weight, the effect of improving the fluidity at the time of injection molding is small, and it is 3% by weight.
This is because the mechanical strength of the molded product decreases if it exceeds the range.
Further, in claim 2 of Japanese Patent Publication No. 54-13993, there is described a resin magnet using an ethylene-ethyl acrylate copolymer to which a polypropylene resin is added, but this is merely heat resistance. It is only added to raise the. The addition of the polypropylene resin in the present invention is to improve the toner resistance and control the volume resistivity, and the purpose of the addition is completely different from that described in JP-B-54-13993. Please specify.
【００１４】[0014]
【実施例】本発明の実施例及び比較例を以下に示すが、
本発明がこれら実施例のみに限定されないことは勿論で
ある。 《実施例１、２、３、４、５、比較例１、２、３、４、
５、６》表１に示すように等方性バリウムフェライト
（等方性ＢａＦｒ）、異方性ストロンチウムフェライト
（異方性ＳｒＦｒ）、エチレンエチルアクリレートコポ
リマー（ＥＥＡ）、ポリプロピレン樹脂（ＰＰ）、ポリ
アミド６樹脂（ＰＡ６）からなる組成物および滑剤とし
てリチウムヒドロキシステアリン酸０．２重量部を小型
高速ミキサーで撹拌混合し、二軸同方向連続押出機で１
５０℃から１７０℃（比較例５のみは１５０℃から２３
０℃）のシリンダ設定温度で溶融混練し、造粒機で造粒
したペレットを２．５オンスの射出成形機でシリンダ設
定温度２１０℃から２３０℃（比較例５のみは２３０℃
から２５０℃）で射出成形し、体積抵抗率測定用、及び
耐トナー性評価用には外径８０mm、厚み４mmの円盤を成
形し、磁力測定用には外径３０mm、厚み３．５mmの円盤
を軸配向に磁場をかけながら成形し、耐ヒートショック
性の評価用には図１に示すような金属インサート１をプ
ラスチック磁石２で被覆したインサート成形品を作成し
た。体積抵抗率は、５０mmφの電極で電圧１００Ｖで測
定した。耐トナー性は、薄層化したトナーを試料とガラ
ス板ではさみこみ、１３０℃で３０分、熱と荷重をかけ
た後ガラス板を剥して、トナーと試料の融着状態を見
た。耐ヒートショック性は図１に示す成形品を−４０℃
で１時間放置し、その後直ちに７０℃で１時間放置する
ことを１０サイクル繰り返して、成形品のクラックの有
無を調べた。多極着磁は図１に示す成形品について６０
極で試み、均一な着磁が可能かどうか調べた。そして、
これらの評価結果を表１及び表２に示した。EXAMPLES Examples and comparative examples of the present invention are shown below.
Of course, the present invention is not limited to these examples. << Examples 1, 2, 3, 4, 5, Comparative Examples 1, 2, 3, 4,
5, 6 >> As shown in Table 1, isotropic barium ferrite (isotropic BaFr), anisotropic strontium ferrite (anisotropic SrFr), ethylene ethyl acrylate copolymer (EEA), polypropylene resin (PP), polyamide 6 A resin (PA6) composition and 0.2 parts by weight of lithium hydroxystearic acid as a lubricant were mixed by stirring with a small high-speed mixer, and then mixed with a twin-screw co-directional continuous extruder to obtain 1
50 ° C to 170 ° C (150 ° C to 23 ° C only in Comparative Example 5)
Melt kneading at a cylinder setting temperature of 0 ° C., and pelletizing the pellets granulated by a granulator with a 2.5 ounce injection molding machine from a cylinder setting temperature of 210 ° C. to 230 ° C. (230 ° C. for Comparative Example 5 only)
Injection molding at 250 to 250 ° C.) to form a disk with an outer diameter of 80 mm and a thickness of 4 mm for volume resistivity measurement and toner resistance evaluation, and a disk with an outer diameter of 30 mm and thickness of 3.5 mm for magnetic force measurement. Was molded while applying a magnetic field to the axial orientation, and for evaluation of heat shock resistance, an insert molded product was prepared by coating the metal insert 1 with the plastic magnet 2 as shown in FIG. The volume resistivity was measured with an electrode of 50 mmφ at a voltage of 100V. Regarding the toner resistance, the thinned toner was sandwiched between the sample and the glass plate, the glass plate was peeled off after applying heat and load for 30 minutes at 130 ° C., and the fusion state of the toner and the sample was observed. The heat shock resistance of the molded product shown in Fig. 1 is -40 ° C.
The molded product was examined for cracks by repeating 10 cycles of standing for 1 hour at 70 ° C. and then immediately standing at 70 ° C. for 1 hour. Multi-pole magnetization is 60 for the molded product shown in FIG.
We tried with poles and examined whether uniform magnetization was possible. And
The evaluation results are shown in Tables 1 and 2.
【００１５】 ただし、1.9E12とは１.９×１０12を表す。その他につ
いても同様。[0015] However, 1.9E12 means 1.9 × 10 12 . The same applies to other cases.
【００１６】 ただし、3.9E12とは３.９×１０12を表す。その他につ
いても同様。[0016] However, 3.9E12 means 3.9 × 10 12 . The same applies to other cases.
【００１７】実施例１〜５に関しては、耐トナー性、耐
ヒートショック性に優れ、均一な多極着磁可能な材料が
得られており、実施例１〜３に示すように同等の磁気特
性を持ちながら体積抵抗率の異なる材料も得ることがで
きる。比較例１ではバインダーとしてエチレン−エチル
アクリレート共重合体のみを用いているため、耐トナー
性が悪い。比較例２ではバインダーとしてポリプロピレ
ン樹脂のみを用いているため、耐トナー性は良いものの
耐ヒートショック性が極めて悪い。比較例３では樹脂の
配合量が本特許の請求範囲以上に多いため、磁気特性が
低すぎ、工業的に好適とならない。比較例４では逆に樹
脂の配合量が本特許の請求範囲より少ないため極めて成
形性が悪く、成形不可であった。比較例５ではポリアミ
ド樹脂を用いているため耐トナー性、耐ヒートショック
性ともに悪い。比較例６では異方性の磁性粉を用いてい
るため、多極着磁の際に均一な着磁ができない。In Examples 1 to 5, materials having excellent toner resistance and heat shock resistance and capable of being uniformly magnetized with multiple poles were obtained, and as shown in Examples 1 to 3, equivalent magnetic properties were obtained. It is also possible to obtain materials having different volume resistivity while having In Comparative Example 1, since only the ethylene-ethyl acrylate copolymer is used as the binder, the toner resistance is poor. In Comparative Example 2, since only the polypropylene resin is used as the binder, the toner resistance is good, but the heat shock resistance is extremely poor. In Comparative Example 3, the compounding amount of the resin was more than the claimed range of the present patent, and therefore the magnetic characteristics were too low, which was not industrially suitable. In Comparative Example 4, on the contrary, the amount of resin blended was less than the claimed range of this patent, so that the moldability was extremely poor and molding was impossible. In Comparative Example 5, since the polyamide resin is used, both toner resistance and heat shock resistance are poor. In Comparative Example 6, since anisotropic magnetic powder is used, uniform magnetization cannot be performed during multipolar magnetization.
【００１８】[0018]
【発明の効果】本発明に従えば、従来のプラスチック磁
石組成物に比べ、金属との一体成形後の耐ヒートショッ
ク性に優れ、かつ耐トナー性に優れた成形品を得る事が
でき、さらに磁力を維持したまま電気特性をコントロー
ルする事が可能であり、多極着磁もできるので、ＯＡ機
器特にマグネットローラに使用するプラスチック磁石と
して工業的に好適である。EFFECTS OF THE INVENTION According to the present invention, it is possible to obtain a molded product which is excellent in heat shock resistance after integrally molding with a metal and also excellent in toner resistance as compared with the conventional plastic magnet composition. Since it is possible to control the electric characteristics while maintaining the magnetic force and to perform multi-pole magnetization, it is industrially suitable as a plastic magnet used for OA equipment, especially a magnet roller.
【図１】外径２０ｍｍ、インサート径１０ｍｍ、長さ２
００ｍｍのインサート成形品の側面図及び断面図であ
る。[Fig. 1] Outer diameter 20 mm, insert diameter 10 mm, length 2
It is a side view and a sectional view of an insert molding of 00 mm.
フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０８Ｌ 23/12 ＬＤＣ 7107−4Ｊ Continuation of front page (51) Int.Cl. 5 Identification code Office reference number FI technical display area C08L 23/12 LDC 7107-4J
Claims (4)
量％未満と、メルトインデックスが５以上のエチレン−
エチルアクリレート共重合体を５重量％以上とメルトイ
ンデックスが５以上のポリプロピレン樹脂を２重量％以
上２５重量％以下を含有し、かつその２つの樹脂の合計
が２０重量％以上５０重量％以下である組成を特徴とす
るプラスチック磁石組成物。1. An isotropic ferromagnetic powder comprising 50% by weight or more and less than 80% by weight and ethylene having a melt index of 5 or more.
Contains 5 wt% or more of ethyl acrylate copolymer and 2 wt% or more and 25 wt% or less of polypropylene resin having a melt index of 5 or more, and the total of the two resins is 20 wt% or more and 50 wt% or less. A plastic magnet composition having a composition.
ライトであることを特徴とする請求項１記載のプラスチ
ック磁石組成物。2. The plastic magnet composition according to claim 1, wherein the isotropic ferromagnetic powder is isotropic barium ferrite.
とポリプロピレン樹脂との配合比が４５〜９５重量部：
５５〜５重量部であることを特徴とする請求項１又は請
求項２記載のプラスチック磁石組成物3. The mixing ratio of the ethylene-ethyl acrylate copolymer and the polypropylene resin is 45 to 95 parts by weight:
55 to 5 parts by weight of the plastic magnet composition according to claim 1 or 2.
チック磁石組成物において、エチレン−エチルアクリレ
ート共重合体とポリプロピレン樹脂との配合比率を変え
ることによって、そのプラスチック磁石組成物によって
作られた成形物の体積抵抗率、比誘電率といった電気特
性を変更、制御する方法4. The plastic magnet composition according to claim 1, 2 or 3, wherein the plastic magnet composition is made by changing the compounding ratio of the ethylene-ethyl acrylate copolymer and the polypropylene resin. A method for changing and controlling electrical properties such as volume resistivity and relative permittivity of molded products
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4223045A JPH0669014A (en) | 1992-08-21 | 1992-08-21 | Plastic magnet composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4223045A JPH0669014A (en) | 1992-08-21 | 1992-08-21 | Plastic magnet composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0669014A true JPH0669014A (en) | 1994-03-11 |
Family
ID=16791979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4223045A Pending JPH0669014A (en) | 1992-08-21 | 1992-08-21 | Plastic magnet composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0669014A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009161599A (en) * | 2007-12-28 | 2009-07-23 | Riken Technos Corp | Ferromagnetic thermoplastic resin composition and its use |
| JP2012082442A (en) * | 2012-02-03 | 2012-04-26 | Riken Technos Corp | Ferromagnetic thermoplastic resin composition and use of the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5413993A (en) * | 1977-07-05 | 1979-02-01 | Daido Steel Co Ltd | Anisotropic resin magnet having good heat resistivity |
-
1992
- 1992-08-21 JP JP4223045A patent/JPH0669014A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5413993A (en) * | 1977-07-05 | 1979-02-01 | Daido Steel Co Ltd | Anisotropic resin magnet having good heat resistivity |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009161599A (en) * | 2007-12-28 | 2009-07-23 | Riken Technos Corp | Ferromagnetic thermoplastic resin composition and its use |
| JP2012082442A (en) * | 2012-02-03 | 2012-04-26 | Riken Technos Corp | Ferromagnetic thermoplastic resin composition and use of the same |
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