Polyimide film and manufacturing method thereof
AssigneeKanegafuchi Kagaku Kogyo Kabushiki Kaisha
InventorsHaruhiko Maki, Hirosaku Nagano, Yoshiaki Inaba
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Abstract
The present invention provides an improved grade of polyimide containing an organic phosphorus compound, a film composed thereof and a method of making the aforementioned film. According to the present invention, it is possible to obtain a polyimide film improved in mechanical strength.
Claims19
A method of manufacturing a polyimide film having a thickness of at least 75 .mu.m and which is excellent in tensile strength and flexibility, which comprises adding a dehydration-cyclization agent, a catalyst and an organic phosphorus compound to polyamide acid and then film-forming, wherein the organic phosphorus compound is added in a range of 0.5-5 weight % based on polyimide.
A method of improving tensile strength and flexibility of a polyimide film having a thickness of at least 75 .mu.m and which is excellent in tensile strength and flexibility, which comprises adding a dehydration-cyclization agent, a catalyst and an organic phosphorus compound to polyamide acid, and film-forming, wherein the organic phosphorus compound is added in a range of 0.5-5 weight based on polyimide.
Dependencies are inferred from the claim text.