JPS61266455A - Phenolic resin molding material for commutator - Google Patents
Phenolic resin molding material for commutatorInfo
- Publication number
- JPS61266455A JPS61266455A JP10603885A JP10603885A JPS61266455A JP S61266455 A JPS61266455 A JP S61266455A JP 10603885 A JP10603885 A JP 10603885A JP 10603885 A JP10603885 A JP 10603885A JP S61266455 A JPS61266455 A JP S61266455A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- phenolic resin
- parts
- powder
- molding material
- 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.)
- Granted
Links
- 239000005011 phenolic resin Substances 0.000 title claims abstract description 17
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229920001568 phenolic resin Polymers 0.000 title claims abstract description 16
- 239000012778 molding material Substances 0.000 title claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 22
- 239000003365 glass fiber Substances 0.000 claims abstract description 15
- -1 accelerator Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000002425 crystallisation Methods 0.000 claims abstract description 7
- 230000008025 crystallization Effects 0.000 claims abstract description 7
- 239000004698 Polyethylene Substances 0.000 claims description 9
- 229920000573 polyethylene Polymers 0.000 claims description 9
- 238000002156 mixing Methods 0.000 abstract description 4
- 239000004927 clay Substances 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000000654 additive Substances 0.000 abstract description 2
- 239000003086 colorant Substances 0.000 abstract description 2
- 239000000314 lubricant Substances 0.000 abstract description 2
- 239000004848 polyfunctional curative Substances 0.000 abstract description 2
- 238000005520 cutting process Methods 0.000 description 14
- 239000011810 insulating material Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 238000005553 drilling Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000000945 filler Substances 0.000 description 6
- 239000010425 asbestos Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910052895 riebeckite Inorganic materials 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 2
- 239000004327 boric acid Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- QTWJRLJHJPIABL-UHFFFAOYSA-N 2-methylphenol;3-methylphenol;4-methylphenol Chemical compound CC1=CC=C(O)C=C1.CC1=CC=CC(O)=C1.CC1=CC=CC=C1O QTWJRLJHJPIABL-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical group CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229930003836 cresol Natural products 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、耐熱寸法安定性、熱時回転破壊強度、耐熱性
および切削加工性に優れた、コンミテータ絶縁材用のフ
ェノール樹脂成形材料に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a phenolic resin molding material for commutator insulation material, which has excellent heat-resistant dimensional stability, hot rotational fracture strength, heat resistance, and machinability. It is.
〔従来技術〕 ゛
自動車用、或いは、家庭電気用モーターのコンミテータ
に使用される絶縁材料には、生産性の点からモールドタ
イプのものが最も適しており、また、コンミテータの小
型・高速化に伴なう、モールドタイプの絶縁材料には熱
硬化性樹脂が適している。コンミテータ用絶縁材料には
絶縁性はもとより耐熱寸法安定性、熱時回転破壊強度、
耐熱性、切削加工性等が要求されることから、従来、ア
スベスト繊維を主な充填剤とするフェノール樹脂成形材
料が使用されてきた。[Prior art] ゛Mold-type insulating materials are most suitable for use in commutators for automobiles and home electric motors from the viewpoint of productivity, and as commutators become smaller and faster, Now, thermosetting resin is suitable for mold type insulation material. Insulating materials for commutators have not only insulation properties, but also heat-resistant dimensional stability, rotational breakdown strength under heat,
Since heat resistance, machinability, etc. are required, phenolic resin molding materials containing asbestos fiber as the main filler have conventionally been used.
しかしながら、近年、安全面からアスベスト規制が厳し
くなっており、これに替る樹脂成形材料が必要となって
いる。However, in recent years, regulations on asbestos have become stricter from a safety perspective, and there is a need for a resin molding material that can replace it.
耐熱寸法安定性、熱時回転破壊強度等の特性を満足する
ためには、ガラス繊維を主な充填剤とするフェノール樹
脂成形材料が望ましいが、切削加工性に問題がある。こ
れはガラス繊維が硬いため、切削加工工程において切削
抵抗が犬であり（加工しに＜＜）、また、バイト等、工
具の摩耗が著しるしく速いこと、およびそれに伴ない成
形品に欠けが発生することである。In order to satisfy properties such as heat-resistant dimensional stability and hot rotational fracture strength, a phenolic resin molding material containing glass fiber as the main filler is desirable, but it has a problem with machinability. This is because glass fiber is hard, so the cutting resistance in the cutting process is high (<<), and the wear of tools such as bits is extremely rapid, and the resulting molded products are often chipped. It is something that happens.
切削加工性に着目すれば、ジアリルフタレート樹脂等が
優れているが、熱時強度、コストの面で不充分であシ、
コンミテータ用絶縁材料としての特性を満足し、かつ切
削加工性の優れたフェノール樹脂成形材料が望まれた。Diaryl phthalate resins are excellent in terms of machinability, but they are insufficient in terms of heat strength and cost.
There was a desire for a phenolic resin molding material that satisfies the characteristics of an insulating material for commutators and has excellent machinability.
本発明は、従来ガラス繊維を主な充填剤とするフェノー
ル樹脂成形材料では、解決できなかった切削加工性を得
んとして研究した結果、金属水酸化物とポリエチレン粉
末を併用添加することによ）、切削加工性が向上すると
の知見を得、更にこの知見に基づき種々研究を進めて本
発明を完成するに至ったものである。The present invention was developed as a result of research aimed at achieving machinability, which could not be achieved with conventional phenolic resin molding materials containing glass fiber as the main filler. They obtained the knowledge that cutting workability was improved, and based on this knowledge, they proceeded with various studies and completed the present invention.
その目的とするところは、耐熱寸法安定性、熱時回転破
壊強度、耐熱性等の緒特性を劣化させることなく切削加
工性に優れたコンミテータ絶縁材用の成形材料を提供す
るにある。The purpose is to provide a molding material for a commutator insulating material that has excellent machinability without deteriorating properties such as heat-resistant dimensional stability, hot rotational fracture strength, and heat resistance.
本発明は、フェノール樹脂１００重量部に対してガラス
繊維６０〜２００重量部、結晶水を１０重量％以上含む
無機粉末１０〜１００重量部、およびぜリエテレン粉末
１〜１０重量部を配合してなることを特徴とするコンミ
テータ用アスベストレスフェノール樹脂成形材料である
。In the present invention, 60 to 200 parts by weight of glass fiber, 10 to 100 parts by weight of inorganic powder containing 10% by weight or more of water of crystallization, and 1 to 10 parts by weight of Zerithelene powder are blended with 100 parts by weight of phenolic resin. This is an asbestos-less phenolic resin molding material for commutators.
本発明において使用されるフェノール樹脂は、ノボラッ
ク形成いはレゾール形樹脂のどちらでも良く、また、必
要に応じてキシレン樹脂、クレゾール樹脂等で変性して
も差し支えない。The phenolic resin used in the present invention may be either a novolac-forming resin or a resol-type resin, and may be modified with xylene resin, cresol resin, etc., if necessary.
また本発明において耐熱寸法安定性、熱時回転破壊強度
等の特性を保持する目的でガラス繊維が使用されている
が、その量は添加する無機粉末、ポリエチレンの性質お
よび量によシ左右されるが、フェノール樹脂１００重量
部に対し、６０〜２００重量部の範囲である。６０重量
部以下では熱時強度等が不充分であり、２００重量部以
上では良好な切削加工性が得られず、コンミテータ用絶
縁材料としては不適である。In addition, in the present invention, glass fiber is used to maintain properties such as heat-resistant dimensional stability and rotational fracture strength under heat, but the amount depends on the properties and amount of the inorganic powder and polyethylene added. is in the range of 60 to 200 parts by weight per 100 parts by weight of the phenol resin. If it is less than 60 parts by weight, the strength under heat is insufficient, and if it is more than 200 parts by weight, good machinability cannot be obtained, making it unsuitable as an insulating material for commutators.
本発明において使用される無機粉末は、結晶水を１０重
量−以上含むものであシ、５０〜６００℃の温度範囲内
で、吸熱脱水分解して水を放出するものである。このよ
うなものとして水酸化アルミニウム、水酸化マグネシウ
ム、塩基性炭酸マグネシウム、硼砂、硼酸、未焼性クレ
ー、コンマナイト等をあげることができるが好ましくは
水酸化アルミニウム、未焼成りレー、＾朋酸等が使用さ
れる。これらの無機粉末は切削加工時に１結晶水を放出
し、発熱によるバイト等の工具の摩耗をおさえる目的で
使用されておシ、その量は無機粉末の種類によシ異なる
がフェノール樹脂１００重量部に対して１０〜１００重
量部の範囲である。１０重量部以下では工具摩耗性に対
する効果が不充分であシ、１００重量部以上では絶縁性
、熱時強度等が不充分となり、コンミテータ用絶縁材料
としては不適である。The inorganic powder used in the present invention contains 10 weight or more of water of crystallization, and releases water through endothermic dehydration and decomposition within a temperature range of 50 to 600°C. Examples of such materials include aluminum hydroxide, magnesium hydroxide, basic magnesium carbonate, borax, boric acid, unfired clay, commanite, etc., but aluminum hydroxide, unfired clay, and boric acid are preferred. etc. are used. These inorganic powders release crystal water during cutting and are used to suppress the wear of tools such as bits due to heat generation.The amount varies depending on the type of inorganic powder, but 100 parts by weight of phenolic resin is used. The range is 10 to 100 parts by weight. If the amount is less than 10 parts by weight, the effect on tool abrasion resistance will be insufficient, and if it is more than 100 parts by weight, the insulation properties, strength under heat, etc. will be insufficient, making it unsuitable as an insulating material for commutators.
また、本発明において使用されるポリエチレン粉末は、
成形物の柔軟性を増加させ、かつ潤滑性を有するもので
あシ、一般に低密度、中密度および高密度セＩＪエチレ
ンのいずれでも良好な結果が得られるが、好ましくはよ
シ軟質である低密度および中密度品が使用される。ポリ
エチレンはこの柔軟性、潤滑性により、切削加工時に切
削抵抗を低下させる（加工し易すくする）とともにバイ
ト等の工具の摩耗を抑制し切削加工時の欠けを低減させ
る目的で使用されておシ、その量はフェノール樹脂１０
０重量部に対して１〜１０重量部の範囲である。１重量
部以下では切削抵抗を低下させる効果が不充分であり、
１０重量部以上では熱時強度等が不充分となシ、コンミ
テータ用絶縁材料としては不適である。In addition, the polyethylene powder used in the present invention is
It increases the flexibility of the molded product and has lubricity. In general, good results can be obtained with any of low density, medium density and high density IJ ethylene. Density and medium density products are used. Due to its flexibility and lubricity, polyethylene is used for the purpose of reducing cutting resistance during cutting (making it easier to process), suppressing the wear of tools such as bits, and reducing chipping during cutting. , the amount is phenolic resin 10
The amount ranges from 1 to 10 parts by weight relative to 0 parts by weight. If it is less than 1 part by weight, the effect of reducing cutting resistance is insufficient;
If the amount exceeds 10 parts by weight, the strength under heat will be insufficient and it will be unsuitable as an insulating material for commutators.
ぼりエチレン粉末の添加による切削抵抗の低下効果はさ
きの結晶水を含む無機粉末を併用添加することによシ、
その効果が発揮されるものである。The effect of reducing cutting resistance by adding ethylene powder can be achieved by adding inorganic powder containing water of crystallization.
The effect is demonstrated.
単なるガラス繊維へのポリエチレンのみの添加では切削
加工性に対する効果は不充分である。Simply adding polyethylene to glass fibers does not have a sufficient effect on machinability.
以上の様に、切削加工性に優れかつコンミテータ用絶縁
材料としての特性を満足し得る配合割合については、フ
ェノール樹脂１００重量部に対してガラス繊維６０〜２
００重量部、結晶水を含む無機粉末１０〜１００重量部
、およびｆｆｌ ＋７工チレン粉末１〜１０重量部が好
ましい。As mentioned above, the blending ratio that has excellent machinability and satisfies the characteristics as an insulating material for commutators is 60 to 2 parts by weight of glass fiber to 100 parts by weight of phenolic resin.
00 parts by weight, 10 to 100 parts by weight of inorganic powder containing water of crystallization, and 1 to 10 parts by weight of ffl +7 polyethylene powder are preferred.
一般にはこれらの組成物に対して必要によシ、硬化剤、
促進剤、滑剤、着色剤等を加えて加熱混練して成形材料
を得るが、ポリエチレンに関してはその混合方法に制限
条件はなく、加熱混練、成形材料への粉末混合など任意
の方法が適宜選択使用される。Generally, these compositions require additives such as hardeners, curing agents,
A molding material is obtained by adding accelerators, lubricants, coloring agents, etc. and heating and kneading, but there are no restrictions on the mixing method for polyethylene, and any method such as heating and kneading or mixing powder into the molding material can be used as appropriate. be done.
本発明に従うと耐熱寸法安定性、熱時回転破壊強度、耐
熱性、耐アーク性に優れた成形材料をアスベストを含ま
ずに得ることができるとともにガラス繊維高充填による
切削加工性の問題をも除かれるためコンミテータ用絶縁
材料として好適である。According to the present invention, it is possible to obtain a molding material that is excellent in heat-resistant dimensional stability, hot rotational fracture strength, heat resistance, and arc resistance without containing asbestos, and also eliminates problems in machinability due to high glass fiber filling. This makes it suitable as an insulating material for commutators.
その低寸法安定性、機械強度が要求され、かつ切削加工
の必要とされる各種部品用材料としても適している。It requires low dimensional stability and mechanical strength, and is also suitable as a material for various parts that require cutting.
切削加工性の評価には、種々の組成物を調整し、これを
３鴫厚の円板に圧縮成形し、試験片とし、ドリル摩耗試
験装置を用いて試験を行なった。For evaluation of cutting workability, various compositions were prepared, compression molded into a disk with a thickness of 3 mm, used as a test piece, and tested using a drill wear test device.
この試験装置はドリル径３ｍｍ鏝、刃の切れが同等のド
リルを使用し、ドリル回転数８５ Ｏｒｐｍ荷重２呻に
設定されたものである。試験片はそれぞれ３０回ずつ穿
孔して評価を行なうが、ドリルの刃の切れの差による誤
差を回避するため、試験片３０回穿孔の前後に３謹厚の
Ｍ板を穿孔し、次に示す値により切削抵抗、工具摩耗性
を評価した。This test device uses a trowel with a drill diameter of 3 mm, a drill with the same cutting edge, and is set at a drill rotation speed of 85 orpm and a load of 2 mm. Each test piece was perforated 30 times for evaluation, but in order to avoid errors due to differences in the sharpness of the drill bit, three thick M plates were perforated before and after the test piece was perforated 30 times. Cutting resistance and tool wear resistance were evaluated based on the values.
ｔｌ：試験片 １回目穿孔時の穿孔所要時間ｔＡｌ：
Ｉ 穿孔前のＭ板穿孔所要時間ｔＡｔ’： Ｉ
３０回穿孔後のＭ板穿孔所要時間
尚、切削抵抗、および工具摩耗性は供に値の小さいもの
程良好である。tl: Test piece Required drilling time for the first drilling tAl:
I Time required for drilling M plate before drilling tAt': I
The time required for drilling the M plate after 30 drillings.The smaller the cutting resistance and tool wear resistance, the better.
実施例１〜４は、ガラス繊維、結晶水含む無機粉末を１
種或いは２種、ポリエチレン粉末を配合し □たも
のであシ、比較例１はアスベストのみを充填剤とするも
の、比較例２はガラス繊維のみを充填剤とするもの、比
較例３はガラス繊維と結晶水を含む無機粉末を配合した
もの、比較例４はガラス繊維とポリエチレン粉末を配合
したものである。In Examples 1 to 4, 1 inorganic powder containing glass fiber and water of crystallization was used.
Comparative Example 1 uses asbestos as the filler only, Comparative Example 2 uses glass fiber as the filler only, Comparative Example 3 uses glass fiber as the filler. and Comparative Example 4 is a blend of glass fiber and polyethylene powder.
表１に実施例、および比較例の組成および特性を示した
。Table 1 shows the compositions and properties of Examples and Comparative Examples.
実施例はいづれも比較例１と同等か或いはそれ以上の切
削加工性を有しておシ、また比較例２〜４との比較によ
り、結晶水を含む無機粉末とポリエチレン粉末を併用添
加することにより切削加工性が急激に向上していること
が明らかである。All of the examples had machinability equal to or better than Comparative Example 1, and in comparison with Comparative Examples 2 to 4, inorganic powder containing crystal water and polyethylene powder were added together. It is clear that the machinability is rapidly improved.
また、比較例１と比較した場合、強度、寸法精度とも優
れておシ、コンミテータの小型・高速化にも充分対応で
きるものである。Moreover, when compared with Comparative Example 1, it has excellent strength and dimensional accuracy, and can sufficiently support commutator miniaturization and speeding up.
以上よシ、本発明がコンミテータの絶縁材として、いか
に有用であるかは明らかである。From the above, it is clear how useful the present invention is as an insulating material for commutators.
Claims (1)
２００重量部、結晶水を１０重量％以上含む無機粉末１
０〜１００重量部およびポリエチレン粉末１〜１０重量
部を配合してなることを特徴とするコンミテータ用フェ
ノール樹脂成形材料。60 to 60 parts of glass fiber per 100 parts by weight of phenolic resin
Inorganic powder 1 containing 200 parts by weight and 10% by weight or more of water of crystallization
A phenolic resin molding material for a commutator, characterized in that it contains 0 to 100 parts by weight and 1 to 10 parts by weight of polyethylene powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60106038A JPH0717814B2 (en) | 1985-05-20 | 1985-05-20 | Resin molding material for computer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60106038A JPH0717814B2 (en) | 1985-05-20 | 1985-05-20 | Resin molding material for computer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61266455A true JPS61266455A (en) | 1986-11-26 |
| JPH0717814B2 JPH0717814B2 (en) | 1995-03-01 |
Family
ID=14423468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60106038A Expired - Fee Related JPH0717814B2 (en) | 1985-05-20 | 1985-05-20 | Resin molding material for computer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0717814B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2659176A1 (en) * | 1990-03-05 | 1991-09-06 | Mitsuba Electric Mfg Co | Current commutator for an electric dynamo machine and its method of manufacture |
| JP2010222510A (en) * | 2009-03-25 | 2010-10-07 | Sumitomo Bakelite Co Ltd | Phenol resin molding material |
| WO2011052127A1 (en) * | 2009-10-26 | 2011-05-05 | パナソニック電工株式会社 | Phenol resin molding material and phenol resin molded article |
| JP2011202028A (en) * | 2010-03-25 | 2011-10-13 | Panasonic Electric Works Co Ltd | Phenol resin molding material and molded article produced by using the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5674147A (en) * | 1979-11-22 | 1981-06-19 | Sumitomo Bakelite Co Ltd | Thermosetting resin composition |
| JPS58111844A (en) * | 1981-12-25 | 1983-07-04 | Furukawa Electric Co Ltd:The | Inorganic-filled polyolefin resin composition |
-
1985
- 1985-05-20 JP JP60106038A patent/JPH0717814B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5674147A (en) * | 1979-11-22 | 1981-06-19 | Sumitomo Bakelite Co Ltd | Thermosetting resin composition |
| JPS58111844A (en) * | 1981-12-25 | 1983-07-04 | Furukawa Electric Co Ltd:The | Inorganic-filled polyolefin resin composition |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2659176A1 (en) * | 1990-03-05 | 1991-09-06 | Mitsuba Electric Mfg Co | Current commutator for an electric dynamo machine and its method of manufacture |
| JP2010222510A (en) * | 2009-03-25 | 2010-10-07 | Sumitomo Bakelite Co Ltd | Phenol resin molding material |
| WO2011052127A1 (en) * | 2009-10-26 | 2011-05-05 | パナソニック電工株式会社 | Phenol resin molding material and phenol resin molded article |
| JP2011202028A (en) * | 2010-03-25 | 2011-10-13 | Panasonic Electric Works Co Ltd | Phenol resin molding material and molded article produced by using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0717814B2 (en) | 1995-03-01 |
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