Title:
AROMATIC POLYIMIDE FILM AND ITS FORMATION
Document Type and Number:
Japanese Patent JP2540398
Kind Code:
B2
Abstract:
PURPOSE: To obtain the subject film uniformly having many protruding inorg. particles and a high heat resistance by casting an arom. polyamic acid on a support, drying the resulting thin film, peeling the film off the support, coating the surface of the film with a liquid dispersion of inorg. particles and heat- treating the coated film.
CONSTITUTION: A soln. of an arom. polyamic acid is cast on a support to form a thin film of the soln., which is then dried to form a self-supporting film constituted of the arom. polyamic acid and a polar org. solvent. The film is then peeled off the support and coated with a liquid dispersion of inorg. particles of 0.01 to 100μm in average size homogeneously dispersed in a low-boiling org. solvent to form a coating layer, which is then dried and heat-treated at a high rate while retaining the fine inorg. particles in the surface layer of the film. The inorg. particles of the above-mentioned size are respectively retained while partially being embedded. The resulting film has 1×10 to 5×108 particles/mm2 uniformly all over the surface layer thereof.
Inventors:
MATSUBARA TAKEYUKI
SATO RYOICHI
SHIMIZU YUKIO
SATO RYOICHI
SHIMIZU YUKIO
Application Number:
JP27301691A
Publication Date:
October 02, 1996
Filing Date:
July 23, 1991
Export Citation:
Assignee:
UBE INDUSTRIES
International Classes:
C08J5/18; C08K3/22; C08K3/36; C08L79/08; (IPC1-7): C08J5/18; C08K3/22; C08K3/36; C08L79/08
Foreign References:
| US4477620A |