Polyester film for magnetic recording media
US5164439A · kind A · utility
18Cited by
4References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1991 |
| Grant date | Nov 17, 1992 |
| Priority date | — |
| Expiry date | Jun 5, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2367/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A biaxially oriented polyester film containing a specific calcium carbonate is described. The calcium carbonate contained in the film is specified by its vaterite form, its average particles size of 0.07 to 1.5 .mu.m, and its particle size distribution ratio of not more than 2.00. The biaxially oriented polyester film containing such specific calcium carbonate is excellent in both the running property and wear resistance, and suitable for the use as a base of magnetic recording media.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.