Laminated polyester film and magnetic recording medium using it as base film
US5431976A · kind A · utility
3Cited by
6References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1993 |
| Grant date | Jul 11, 1995 |
| Priority date | — |
| Expiry date | Apr 20, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/266
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A laminated polyester film for use in a magnetic recording medium, which comprises (A) a first layer of a first polyester which contains at least 95 mol %, based on the total content of its dicarboxylic acid components, of a 2,6-naphthalenedicarboxylic acid component and whose main recurring unit is composed of ethylene-2,6-naphthalenedicarboxylate, and (B) a second layer of a second polyester containing 93 to 99 mol %, based on the total content of its recurring units, of an ethylene-2,6-naphthalenedicarboxylate recurring unit. The second layer is laminated on at least one surface of two surfaces of the above first layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.