DEVICE AND METHOD OF PRODUCING POLYIMIDE FILM Russian patent published in 2011 - IPC C08J5/18 B29C41/34 

FIELD: process engineering.

SUBSTANCE: inventions relate to production of polyimide film used as heatproof electric insulation or as metalised film substrates for electronic hardware. Proposed device comprises two containers with solutions of polyamine acid with catalysts and dehydrating agent 1, two gear pumps 2, two-slit spinneret 3, drum 4 or endless tape 6, and high-temperature rolls. Primary element of proposed device is said two-slit spinneret with two separate slit heads to feed solutions and constrictors, 5-10 mm-wide and 10-20 mm-long, arranged on faces of each slit on spinneret edges. Said spinneret consists of two cheeks 7, two half-dies 12 and 14, spacer 13, differential screw 11, threaded coupling 10, lock screw 5, assembly screw 15 and four limiters 8. Produced method comprises feeding two solutions of polyamine acid with ring formation catalysts and dehydrating agent on drum or endless tape moulding surface via one spinneret at 0.8-1.0 MPa with solutions dynamic viscosity of 200-500 p, and performing imidine formation at stepped temperature increase from 150°C to 350°C.

EFFECT: high-quality, uniform-thickness polyiminide film.

4 cl, 4 dwg, 1 tbl