Magnetic tape

• US 20050196645A1
• Filed: 02/09/2005
• Published: 09/08/2005
• Est. Priority Date: 02/10/2004
• Status: Abandoned Application

• Current Assignee: Hitachi Maxell Limited (Maxell, Ltd.)
• Original Assignee: Hitachi Maxell Limited (Maxell, Ltd.)
• Inventors: Sakata, Shinji, Kuse, Sadamu, Inoue, Tetsutaro, Doi, Tsugihiro
• Application Number:
  US11/052,952
• Publication Number:
  US 20050196645A1
• Time in Patent Office: Days
• US Class Current: 428/845
• CPC Class Codes: G11B 5/733 characterised by the addition of non-magnetic particles base layers having a non-magnetic layer under a soft magnetic layer G11B5/736; magnetic recording media substrates G11B5/739
• CPC Class Codes: G11B 5/7334 Base layer characterised by composition or structure

Abstract

A magnetic tape having excellent high recording density characteristics, good durability and good servo-tracking characteristics, which comprises a non-magnetic support, a magnetic layer formed on one surface of the non-magnetic support and containing a magnetic powder, a primer layer provided between the non-magnetic support and the magnetic layer and containing a non-magnetic powder, and a back coat layer formed on the other surface of the non-magnetic support, wherein the non-magnetic powder is goethite particles having an average particle size in a range of from 5 nm to 100 nm and the magnetic tape has an edge weave amount of 1.0 μm or less.

Claims

1. A magnetic tape comprising a non-magnetic support, a magnetic layer formed on one surface of said non-magnetic support and containing a magnetic powder, a primer layer provided between said non-magnetic support and said magnetic layer and containing a non-magnetic powder, and a back coat layer formed on the other surface of said non-magnetic support, wherein said non-magnetic powder is goethite particles having an average particle size in a range of from 5 nm to 100 nm and said magnetic tape has an edge weave amount of 1.0 μ

m or less.

2. The magnetic tape according to claim 1, wherein said primer layer has a thickness of 0.2 to 1.5 μ

m.

3. The magnetic tape according to claim 1, wherein said primer layer further contains carbon black having an average particle size of 0.01 to 0.1 μ

m and aluminum oxide particles having an average particle size of 0.01 to 0.1 μ

m.

4. The magnetic tape according to claim 1, wherein said magnetic layer has a thickness of 0.01 to 0.15 μ

m.

5. The magnetic tape according to claim 1, wherein said magnetic layer has a coercive force of 80 to 320 kA/m.

6. The magnetic tape according to claim 1, wherein said magnetic powder is at least one magnetic powder selected from the group consisting of ferromagnetic iron-based metal magnetic powder and iron nitride magnetic powder.