Polyester films useful as magnetic tapes
US4096109A · kind A · utility
11Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1976 |
| Grant date | Jun 20, 1978 |
| Priority date | — |
| Expiry date | Jul 16, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S260/35
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A polyester film is disclosed which comprises (a) a polyester mainly consisting of polyethylene terephthalate which includes first inert particles being precipitated in the polyester-forming reaction system and having an average particle diameter of 1 to 3 microns and which shows a solution haze of 25 to 75% and (b) an additive amount of second inert substance particles which are added to said polyester (a) insoluble in said polyester (a), inert to the polyester-forming reaction and have an average particle diameter of 1 to 5 microns. The film is useful as a base of a magnetic tape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.