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| Pneumatic isostatic compaction of sintered compacts |
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Magnetic recording medium with dual layer front coating and method of manufacture
| Details |
Inventors: Lowery, David C.; Isobe, Ryosuke;
Assignee: Imation Corp. (Oakdale, MN); Quantegy, Inc. (Opelika, AL)
Primary Examiner: Rickman; Holly
Assistant Examiner:
Attorney, Agent or Firm: Dicke, Billig & Czaja PLLC
A magnetic recording medium including a non-magnetic substrate, a back coat, a lower layer, and a magnetic upper layer. The substrate defines a front side and back side, with the back coat being formed on the back side. The lower layer is disposed over the front side of the substrate and includes a primary powder material and conductive carbon black material dispersed in a binder. The primary lower layer powder material comprises particles having a coercivity of less than 300 Oe coated with an electroconductive material. The magnetic upper layer is disposed over the lower layer and includes a magnetic powder dispersed in a binder. |
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DETAILED DESCRIPTION One aspect of the present invention relates to a magnetic recording medium including a non-magnetic substrate, a back coat, a lower support layer, and a magnetic upper layer.
The substrate defines a front side and back side, with the back coat being formed on the back side.
The lower layer is disposed over the front side of the substrate and includes a primary powder material and a conductive carbon black material dispersed in a binder.
The lower layer primary powder material consists of particles having a coercivity in the range of 0-300 Oe coated with an electroconductive material.
Amounts of the electroconductive coating material and the conductive carbon black are provided based upon the following relationship between a weight percent of the conductive carbon black and a weight percent of the electroconductive coating: 14-2x.
ltoreq.
y.
ltoreq.
30-x, and 8.
ltoreq.
y, and 0.
5.
ltoreq.
x.
ltoreq.
13, where x=weight percent of conductive carbon black in the lower layer formulation; and y=weight percent of the electroconductive coating material in the lower layer formulation.
The magnetic upper layer is disposed over the lower layer and includes a magnetic powder dispersed in a binder.
In one preferred embodiment, the lower layer primary powder is carbon-coated hematite, and a weight ratio of the coated hematite to the conductive carbon black material is 1.
5 to 3.
5 parts by weight conductive carbon black, based upon 100 parts by weight of the carbon-coated hematite (1.
5% to 3.
5% conductive carbon black based on weight of the carbon-coated hematite).
In another preferred embodiment, the lower layer and upper layer formulations include a stearic acid lubricant that is more than 90 percent pure.
Another aspect of the present invention relates to a magnetic recording medium including a non-magnetic substrate, a back coat, a lower support layer, and a magnetic upper layer.
The substrate defines a front side and back side, with the back coat being formed on the back side.
The lower layer is disposed over the front side of the substrate and includes a primary powder material and a conductive carbon black material dispersed in a binder
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Manufacturing Materials 
