Covering for the electrical insulation of metal substrates and process for the production thereof

摘要

An electrically insulating covering for a metal substrate surface comprises a thin polyimide layer which is distinguished by its good insulation capacity, readily adheres and can easily be applied. A process for applying the polyimide layer comprises the process steps of spin-on deposition of acid-modified polyamide as a precursor of polyimide, drying of the polyimide layer and subsequently imidisation of the dried polyamide layer.