Method for making polyimide coated conductors in a continuous manner and products made thereby
US4024046A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1975 |
| Grant date | May 17, 1977 |
| Priority date | — |
| Expiry date | Jun 20, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D5/4461
- 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. This is a division, of application Ser. No. 497,516 , filed Aug. 15, 1974 now U.S. Pat. 3,974,324
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.