Magnetic recording tape comprising a polyethylene-2,6-napthalate substrate, magnetic metal thin film, and a backcoat layer
US5431983A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 1994 |
| Grant date | Jul 11, 1995 |
| Priority date | — |
| Expiry date | Aug 10, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording tape, in particular a VTR tape, comprising; PA1 (A) a substrate composed of a biaxially oriented polyethylene-2,6-naphthalate film of which PA2 (a) the Young' modulus in the longitudinal direction is at least 650 kg/mm.sup.2, the Young' modulus in a transverse direction is the same as, or greater than, the Young's modulus in the longitudinal direction, PA2 (b) the heat shrinkage in the transverse direction is in the range of 1.0 to 3.0% when treated at 100.degree. C. for 30 minutes, PA2 (c) the surface roughness, Ra, is not more than 0.005 .mu.m, and PA2 (d) the amount of bled-out oligomer is not more than 0.01 area % when treated in air at 160.degree. C. for 5 minutes, PA1 (B) a thin magnetic metal layer having a thickness of 100 to 1,500 nm and formed on one surface of the substrate, and PA1 (C) a lubricant-containing thin organic polymer layer having a thickness of not more than 1 .mu.m and formed on the other surface of the substrate, said lubricant being in the form of particles which have an average particle diameter of 0.1 to 2.0 .mu.m. This magnetic recording tape has high coercive force and excellent running durability and is capable of recording data …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.