Process for production of motion picture film with sound track containing p-toluenesulfonic acid and glacial acetic acid
US4003743A · kind A · utility
6Cited by
1References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 19, 1975 |
| Grant date | Jan 18, 1977 |
| Priority date | — |
| Expiry date | May 19, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/135
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic sound track layer can be formed with good adherence on the emulsion layer of a photographic material for motion picture film by coating from a liquid composition comprising ferromagnetic powders, a binder, and at least 1% by weight, based on the weight of said ferromagnetic powders, of p-toluenesulfonic acid and at least 3% by weight, based on the weight of said powder of glacial acetic acid. A motion picture film where the magnetic sound track contains p-toluenesulfonic acid and glacial acetic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.