Polyester film with smooth and highly adhesive surface and method of making same
US4732814A · kind A · utility
37Cited by
6References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 2, 1985 |
| Grant date | Mar 22, 1988 |
| Priority date | — |
| Expiry date | Oct 2, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Disclosed is a biaxially stretched polyester film having a modified surface with an excellent bondability, in which both the surface smoothness and the slip characteristic, which are contradictory to each other, are satisfactory. This biaxially stretched polyester film has a multiplicity of ultra-fine protrusions which are an integral part of the film and dyeable with osmic acid. The film is prepared by subjecting an undrawn or drawn polyester sheet to a plasma treatment and then drawing the treated sheet at least once. The film is valuable as a base for a magnetic recording medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.