Polyester film and magnetic recording medium therefrom
US4590119A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1984 |
| Grant date | May 20, 1986 |
| Priority date | — |
| Expiry date | Jun 20, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An oriented polyester film is provided according to the present invention which contains, per 100 parts by weight of a polyester, PA0 (A) 0.005-2 parts by weight of fine particles having average size of 0.05-3 .mu.m, and PA0 (B) 0.005-2 parts by weight of at least one compound selected from the group consisting of high aliphatic monocarboxylic acids having 10-33 carbon atoms and esters thereof. Herein also disclosed is a composite polyester film which comprises a resin layer of copolyester or copolyester ether containing an ester-forming alkali metal salt of sulfonic acid compound, the layer being laminated on at least one side of the oriented polyester film as a substrate. The present invention further provides a magnetic recording medium comprising the oriented polyester film or the composite polyester film as a base. The novel films of the present invention have a surface satisfying three properties: flatness, slipperiness and adhesion, which are considered unable to be attained with a conventional polyester film. Furthermore, a magnetic recording medium having good electromagnetic conversion and running properties can be obtained from the films in the invention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.