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41. 发明专利

DE69825407D1 未知
公开(公告)号：DE69825407D1
公开(公告)日：2004-09-09
申请号：DE69825407
申请日：1998-12-10
申请人： POWDERTECH CO LTD
发明人： KOBAYASHI HIROMICHI , SATO YUJI , HONJO TOSHIO
IPC分类号： G03G9/113
摘要： A carrier for an electrophotographic developer comprising a carrier core coated with a silicone resin containing a quaternary ammonium salt as a catalyst.

42. 发明专利

DE69823154D1 未知
公开(公告)号：DE69823154D1
公开(公告)日：2004-05-19
申请号：DE69823154
申请日：1998-12-23
申请人： POWDERTECH CO LTD
发明人： SATO YUJI , ITAGOSHI TSUYOSHI , HONJO TOSHIO
IPC分类号： G03G9/10 , G03G9/113
摘要： A method for regenerating a carrier coated with a silicone resin or a resin containing a silane coupling agent in an electrophotographic developer comprising the carrier and a toner, which comprises separating the developer into the carrier and the toner, immersing the separated carrier in an aqueous alkali solution, and stirring the mixture to remove the toner component adhered to the carrier surface and the coating resin.

43. 发明专利

DE69505458T2 未知
公开(公告)号：DE69505458T2
公开(公告)日：1999-06-02
申请号：DE69505458
申请日：1995-04-19
申请人： POWDERTECH CO LTD
发明人： SATO YUJI , HONJO TOSHIO , KAYAMOTO KANAO , OGATA MASAHIRO , SHIMIZU KOUICHI
IPC分类号： G03G9/08 , C01G49/00 , G03G9/107 , G03G9/113 , H01F1/00 , H01F1/36
摘要： A ferrite carrier for electrophotographic developers comprises a lithium ferrite of formula (Li2O)x (Fe2O3)100-x (I), wherein x is not more than 16.7 mol.%, and 3-15 mol.%, based on the lithium ferrite, of the Li2O and/or Fe2O3 is substd. with an alkaline earth metal oxide. Also claimed is an electrophotographic developer comprising a toner and the above ferrite carrier.

44. 发明专利

DE69505458D1 未知
公开(公告)号：DE69505458D1
公开(公告)日：1998-11-26
申请号：DE69505458
申请日：1995-04-19
申请人： POWDERTECH CO LTD
发明人： SATO YUJI , HONJO TOSHIO , KAYAMOTO KANAO , OGATA MASAHIRO , SHIMIZU KOUICHI
IPC分类号： G03G9/08 , C01G49/00 , G03G9/107 , G03G9/113 , H01F1/00 , H01F1/36
摘要： A ferrite carrier for electrophotographic developers comprises a lithium ferrite of formula (Li2O)x (Fe2O3)100-x (I), wherein x is not more than 16.7 mol.%, and 3-15 mol.%, based on the lithium ferrite, of the Li2O and/or Fe2O3 is substd. with an alkaline earth metal oxide. Also claimed is an electrophotographic developer comprising a toner and the above ferrite carrier.

45. 发明专利

DE69026914D1 未知
公开(公告)号：DE69026914D1
公开(公告)日：1996-06-13
申请号：DE69026914
申请日：1990-12-03
申请人： POWDERTECH CO LTD
发明人： HONJO TOSHIO , SATO YUJI , KAYAMOTO KANAO , OGATA MASAHIRO
IPC分类号： G03G9/10
摘要： The present invention relates to a carrier for an electrophotographic developer, which has a mean particle diameter of 15 to 50 mu m, a magnetization of 30 to 190 emu/g at 3000 Oe, an apparent density of 1.3 to 4.2 g/cm and a percentage sphericity of 80% or more; a process for preparing the carrier by the plasma method; and an electrophotographic developer comprising the same.

46. 发明专利

CA3028341A1 FERRITE PARTICLES, RESIN COMPOSITION AND ELECTROMAGNETIC WAVE SHIELDING MATERIAL 未知
公开(公告)号：CA3028341A1
公开(公告)日：2017-12-14
申请号：CA3028341
申请日：2017-05-31
申请人： POWDERTECH CO LTD
发明人： KOJIMA TAKASHI , ISHII KAZUTAKA , SUGIURA TAKAO , IGARASHI TETSUYA , AGA KOJI
IPC分类号： H05K9/00 , C01G49/00 , C30B29/22 , H01F1/34
摘要： One purpose of the present invention is to provide ferrite particles which are capable of achieving high magnetic permeability in a frequency band of from 1 MHz to 1 GHz. Another purpose of the present invention is to provide: a resin composition which contains the ferrite particles; and an electromagnetic shielding material which is formed from this resin composition. Ferrite particles according to the present invention are single crystals having an average particle diameter of 1-2,000 nm, and have the shapes of spherical particles. The ferrite particles are characterized by substantially containing no Zn and by containing 3-25% by weight of Mn and 43-65% by weight of Fe. The ferrite particles are also characterized in that the real part µ' of the complex magnetic permeability as measured using a molded body that is formed from the ferrite particles and a binder resin has the maximum value in a frequency band of from 100 MHz to 1 GHz.

49. 发明专利

DE602004017528D1 未知
公开(公告)号：DE602004017528D1
公开(公告)日：2008-12-18
申请号：DE602004017528
申请日：2004-02-06
申请人： POWDERTECH CO LTD
发明人： KOBAYASHI HIROMICHI , SHINMURA ISSEI , ITAGOSHI TSUYOSHI , SATO YUJI
IPC分类号： G03G9/08 , G03G9/10 , G03G9/107 , G03G9/113
摘要： Disclosed is a carrier core material containing at least one metal oxide (M L O) having a melting point of not higher than 1000°C and at least one metal oxide (M H O) having a melting point of not lower than 1800°C, wherein the metal (M H ) for constituting the metal oxide (M H O) has an electrical resistivity of not less than 10 -5 ©·cm. Also disclosed is a two-component developing agent comprising a coated carrier, which comprises the carrier core material coated with a resin, and toner particles. Further disclosed is an image forming method comprising developing an electrostatic latent image formed on a photosensitive member with the two-component developing agent using an alternating electric field. The carrier core material and the coated carrier have high magnetization and are free from occurrence of leakage of electric charge over a wide range of electric field from low electric field to high electric field. According to the two-component developing agent of the invention, an excellent image can be formed.

50. 发明专利

DE60313696T2 未知
公开(公告)号：DE60313696T2
公开(公告)日：2007-10-18
申请号：DE60313696
申请日：2003-03-25
申请人： POWDERTECH CO LTD
发明人： KAYAMOTO KANAO , SHINMURA ISSEI , SATO YUJI
IPC分类号： G03G9/107 , G03G9/10 , G03G9/113
摘要： A resin-coated carrier for an electrophotographic developer and a process of producing the carrier. The carrier comprises a ferrite core mainly comprising iron oxide, primarily having a spinel structure, and having a volume average particle size of 20 to 45 mu m and a resin coat, wherein the carrier has a magnetization of 65 to 80 emu/g in a magnetic field of 1 KOe, the core has an electric current value of 50 to 150 mu A and a surface smoothness uniformity of 75% or higher, and the amount of the resin coat is 0.1 to 5.0% by weight based on the core.

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