This disclosure relates to a photosensitive composition that includes at least one fully imidized polyimide polymer having a weight average molecular weight in the range of about 20,000 Daltons to about 70,000 Daltons; at least one solubility switching compound; at least one photoinitiator; and at least one solvent. The composition is capable of forming a film or a dry film having a dissolution rate of greater than about 0.15 micron/second using cyclopentanone as a developer.

This disclosure relates to a photosensitive composition that includes at least one fully imidized polyimide polymer having a weight average molecular weight in the range of about 20,000 Daltons to about 70,000 Daltons; at least one solubility switching compound; at least one photoinitiator; and at least one solvent. The composition is capable of forming a film or a dry film having a dissolution rate of greater than about 0.15 micron/second using cyclopentanone as a developer.

A photosensitive element 1 comprises a support film 10, a protective film (polypropylene film) 30, and a photosensitive layer 20 which is arranged between the support film 10 and the protective film 30, wherein the protective film 30 has a principal surface 30a at a side of the photosensitive layer 20 and a principal surface 30b at an opposite side of the principal surface 30a, and the principal surface 30a and the principal surface 30b are smooth.

A photosensitive element 1 comprises a support film 10, a protective film (polypropylene film) 30, and a photosensitive layer 20 which is arranged between the support film 10 and the protective film 30, wherein the protective film 30 has a principal surface 30a at a side of the photosensitive layer 20 and a principal surface 30b at an opposite side of the principal surface 30a, and the principal surface 30a and the principal surface 30b are smooth.