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AssigneeUnitika Ltd.
InventorsIsao Tomioka, Minoru Saito, Hiroshi Yamada, Yoshiaki Iwaya, Yoshiaki Echigo
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A film forming solution which does not require aprotic polar solvents, a porous film of poly(4,4'-oxydiphenylenepyromellitimide) obtained from the film forming solution which has excellent heat and chemical resistances, which is controllable in terms of porosity and pore size of the film and which has excellent electrical characteristics, and a coated material where the porous film is formed on a base material. Particularly, a film forming solution of a precursor of poly(4,4'-oxydiphenylenepyromellitimide) and a mixture of at least three solvents which are poor solvents for the precursor when each solvent is used alone, a porous film of poly(4,4'-oxydiphenylenepyromellitimide) obtained from the film forming solution and a coated material where the porous film is formed on a base material.
A film forming solution consisting essentially of a precursor of poly(4,4'-oxydiphenylenepyromellitimide) and a mixture of at least three solvents selected from solvents which are poor solvents for the precursor when each of said solvents is used alone, wherein said poor solvents are solvents which are incapable of dissolving 1 g/100 ml or more of the poly(4,4'-oxydiphenylenepyromellitimide) precursor at 25.degree. C.
A porous film of poly(4,4'-oxydiphenylenepyromellitimide) obtained by forming a porous film of a precursor of poly(4,4'-oxydiphenylenepyromellitimide) from a film forming solution and subsequently effecting the ring closure of the porous film precursor, wherein the film forming solution consists essentially of the precursor of poly(4,4'-oxydiphenylenepyromellitimide) and a mixture of at least three solvents selected from solvents which are poor solvents for the precursor when each of said solvents is used alone, wherein said poor solvents are solvents which are incapable of dissolving 1 g/100 ml or more of the poly(4,4'-oxydiphenylenepyromellitimide) precursor at 25.degree. C.
Dependencies are inferred from the claim text.