公开(公告)号：EP0119619A1

公开(公告)日：1984-09-26

申请号：EP84102978.8

申请日：1984-03-17

Applicant: Hitachi Maxell Ltd.

Inventor： Kawarai, Seigi ,  Kuse, Sadamu

IPC: G11B5/70

CPC classification number: G11B5/7025 ,  G11B5/7022

Abstract: A magnetic recording medium having good dispersibility of magnetic particles and good wear resistance comprising a substrate and a magnetic coat provided thereon, said magnetic coat being composed of magnetic particles dispersed in a binder ingredient, and said binder ingredient being a mixture of a low molecular weight nitrocellulose having a weight-average molecular weight of not more than 40,00 and at least one polymer material selected from the group consisting of polyurethane resins, acrylonitrile-butadiene copolymer resins, chlorinated rubber, polyester resins, polyamide resins, epoxy resins and vinyl chloride resins.

Abstract translation: 一种具有良好的磁性颗粒分散性和良好的耐磨性的磁记录介质，其中包含一基体和设在其上的磁性涂层，所述磁性涂层由分散在粘合剂成分中的磁性颗粒组成，所述粘合剂成分是低分子量的混合物 重均分子量不大于40,00的硝酸纤维素和选自聚氨酯树脂，丙烯腈 - 丁二烯共聚物树脂，氯化橡胶，聚酯树脂，聚酰胺树脂，环氧树脂和氯乙烯的至少一种聚合物材料 树脂。

公开(公告)号：EP0171185B1

公开(公告)日：1989-01-25

申请号：EP85304808.0

申请日：1985-07-05

Applicant: Hitachi Maxell Ltd.

Inventor： Kuse, Sadamu ,  Kawarai, Seigi

IPC: G11B5/71

CPC classification number: G11B5/735 ,  G11B5/72 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/26 ,  Y10T428/2982

公开(公告)号：EP0165076B1

公开(公告)日：1989-09-27

申请号：EP85304321.4

申请日：1985-06-17

Applicant: Hitachi Maxell Ltd.

Inventor： Kuse, Sadamu ,  Kawarai, Seigi

IPC: G11B5/708 ,  G11B5/712

CPC classification number: G11B5/708 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/2982 ,  Y10T428/2991 ,  Y10T428/30

公开(公告)号：EP0171185A3

公开(公告)日：1986-05-07

申请号：EP85304808

申请日：1985-07-05

Applicant: Hitachi Maxell Ltd.

Inventor： Kuse, Sadamu ,  Kawarai, Seigi

IPC: G11B05/71

CPC classification number: G11B5/735 ,  G11B5/72 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/26 ,  Y10T428/2982

Abstract: A magnetic recording medium has a base film, a magnetic layer provided on one surface of the base film and a back coat layer provided on the other surface of the base film. To provide a back coat layer with a low friction coefficient combined with high smoothness, this layer comprises graphitized carbon black powder and a binder therefor. The graphitized carbon black powder may have an average particle size of 20 to 200 mp and typically has a graphitized layer at the surface of each particle, the thickness of the graphitized layer being from 5 to 50% of the particle size.

公开(公告)号：EP0165076A2

公开(公告)日：1985-12-18

申请号：EP85304321.4

申请日：1985-06-17

Applicant: Hitachi Maxell Ltd.

Inventor： Kuse, Sadamu ,  Kawarai, Seigi

IPC: G11B5/708 ,  G11B5/712

CPC classification number: G11B5/708 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/2982 ,  Y10T428/2991 ,  Y10T428/30

Abstract: A magnetic recording medium having an excellent electromagnetic property with a low frictional magnetic layer surface which comprises a base material and a magnetic layer provided thereon, said magnetic layer comprising magnetic powder, a resinous binder and graphitized carbon black powder, optionally with non-graphitized carbon black powder.

公开(公告)号：EP0165076A3

公开(公告)日：1987-10-07

申请号：EP85304321

申请日：1985-06-17

Applicant: Hitachi Maxell Ltd.

Inventor： Kuse, Sadamu ,  Kawarai, Seigi

IPC: G11B05/708 ,  G11B05/712

CPC classification number: G11B5/708 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/2982 ,  Y10T428/2991 ,  Y10T428/30

Abstract: A magnetic recording medium having an excellent electromagnetic property with a low frictional magnetic layer surface which comprises a base material and a magnetic layer provided thereon, said magnetic layer comprising magnetic powder, a resinous binder and graphitized carbon black powder, optionally with non-graphitized carbon black powder.

Abstract translation: 一种磁记录介质，其具有优良的电磁特性和低摩擦磁性层表面，所述低摩擦磁性层表面包括基材和设置在其上的磁性层，所述磁性层包含磁性粉末，树脂粘合剂和石墨化炭黑粉末，任选地具有非石墨化碳 黑火药。

公开(公告)号：EP0171185A2

公开(公告)日：1986-02-12

申请号：EP85304808.0

申请日：1985-07-05

Applicant: Hitachi Maxell Ltd.

Inventor： Kuse, Sadamu ,  Kawarai, Seigi

IPC: G11B5/71

CPC classification number: G11B5/735 ,  G11B5/72 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/26 ,  Y10T428/2982

Abstract: A magnetic recording medium has a base film, a magnetic layer provided on one surface of the base film and a back coat layer provided on the other surface of the base film. To provide a back coat layer with a low friction coefficient combined with high smoothness, this layer comprises graphitized carbon black powder and a binder therefor. The graphitized carbon black powder may have an average particle size of 20 to 200 mp and typically has a graphitized layer at the surface of each particle, the thickness of the graphitized layer being from 5 to 50% of the particle size.

Abstract translation: 磁记录介质具有基膜，设置在基膜的一个表面上的磁性层和设置在基膜的另一个表面上的背涂层。 为了提供结合高平滑​​度的低摩擦系数的背涂层，该层包含石墨化炭​​黑粉末及其粘合剂。 石墨化炭黑粉末的平均粒径可以为20至200μm，并且通常在每个颗粒的表面具有石墨化层，石墨化层的厚度为粒度的5至50％。