Method for making polyimide coated conductors in a continuous manner and products made thereby
US3974324A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1974 |
| Grant date | Aug 10, 1976 |
| Priority date | — |
| Expiry date | Aug 15, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31681
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A continuous method is provided for making polyimide coated conductors, such as wire and metal foil, by continuously passing the conductor into an aqueous plural solvent polyamide acid salt electrocoating bath. Electrodeposition can be effected of polyamide acid having sufficient organic solvent to produce a satisfactory polyimide film by passing the polyamide acid treated conductor through a curing tower. The electrocoating bath can be continuously maintained by use of a semi-permeable membrane allowing for continuous plural solvent and base removal, while makeup aqueous plural solvent polyamide acid salt mixture is continuously introduced into the bath. A polyimide coated aluminum foil useful for making transformer windings is also included.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.