Zusammensetzungen von Polyimidvorläufern und ihre Verwendungen.

摘要

Polyimide precursor compositions incorporating at least one compound of formula (1), at least one compound of formula (2), at least one compound of formula (3) and at least one compound of formula (4) (1) (2) (3) (4) in which one of the groups R3 and R4 represents a hydrogen atom and the other, in the same way as the groups R1 and R2, which can be the same or different, in each case represent a hydrocarbon group having 1 to 16 carbon atoms, m is a number between 5 and 20, n is an integer between 1 and 5 and R5 represents a hydrogen atom, a halogen atom, a hydrocarbon group with 1 to 16 carbon atoms, or a group of formula R6-O- in which R6 represents a hydrocarbon group having 1 to 16 carbon atoms. The preferred composition contains 30 to 70% by weight of dry matter of compounds of formulas (1), (2) and (3), in which the groups R1, R2 and one of the groups R3 and R4 is a methyl or ethyl group and the compound of formula (4) is benzyl alcohol. These compositions are usable as smoothing and/or protective coatings for metals, metal alloys or other substrates and in particular in the electrical and electronic industries, e.g. for the formation of dielectric films.