Polyester film for magnetic tape
US4138386A · kind A · utility
16Cited by
2References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1977 |
| Grant date | Feb 6, 1979 |
| Priority date | — |
| Expiry date | Sep 29, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S260/35
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyester film for magnetic tape including discrete polyester particles containing lithium, calcium and phosphorus, said particles having an average size in the range from 0.1 to 3.0 .mu.m and inert pigments having an average size of 1.0 to 10.0 .mu.m. Magnetic tape from this film has improved abrasion resistance and reduced the occurrence of "drop out".
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.