Polyester film for leader tapes, and a production process thereof
US6030542A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1996 |
| Grant date | Feb 29, 2000 |
| Priority date | — |
| Expiry date | Oct 22, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2367/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention discloses a polyester film for leader tapes, including a polyester film having been brought into contact with an alkaline liquid and etched on at least one side to have a thickness pattern, wherein the polyester film has a tip portion having a thickness of 10 .mu.m or more and is 80% or less of the original thickness. The invention also includes a process for producing a polyester film for leader tapes including the steps of bringing a polyester film into contact with an alkaline liquid and etching the polyester film at least on one side to form a tip portion having a thickness of 10 .mu.m or more and 80% or less of the original thickness, with the etched depth controlled differently from position to position, for processing to have a desired thickness pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.