초록 ▼

A process for preparing a tough, soluble, aromatic, thermoplastic copolyimide is provided. The process comprises the steps of (a) providing 4,4′-oxydiphthalic anhydride to 3,4,3′,4′-biphenyltetracarboxylic dianhydride at a mole ratio ranging from about 25 mole percent to 75 mole percent to 75 mole p

A process for preparing a tough, soluble, aromatic, thermoplastic copolyimide is provided. The process comprises the steps of (a) providing 4,4′-oxydiphthalic anhydride to 3,4,3′,4′-biphenyltetracarboxylic dianhydride at a mole ratio ranging from about 25 mole percent to 75 mole percent to 75 mole percent to about 25 mole percent; (b) adding 3,4′-oxydianiline to form a mixture; c) adding a polar aprotic or polar protic solvent to the mixture to form a solution having a percentage of solids capable of maintaining polymer solubility; (d) stirring the solution to allow it to react; (e) adding an azeotropic solvent to the solution and heating to remove water; (f) cooling the solution of step (e) to room temperature and recovering the tough, soluble, aromatic, thermoplastic copolyimide.

대표청구항 ▼

A process for preparing a tough, soluble, aromatic, thermoplastic copolyimide, the process comprising the steps of: (a) providing 4,4′-oxydiphthalic anhydride and 3,4,3′,4′-biphenyltetracarboxylic dianhydride at a mole ratio ranging from about 25 mole percent to about 75 mole percent 4,4′-oxydiphtha

A process for preparing a tough, soluble, aromatic, thermoplastic copolyimide, the process comprising the steps of: (a) providing 4,4′-oxydiphthalic anhydride and 3,4,3′,4′-biphenyltetracarboxylic dianhydride at a mole ratio ranging from about 25 mole percent to about 75 mole percent 4,4′-oxydiphthalic anhydride to 3,4,3′,4′-biphenyltetracarboxylic dianhydride to about 75 mole percent to about 25 mole percent 4,4′-oxydiphthalic anhydride to 3,4,3′,4′-biphenyltetracarboxylic dianhydride; (b) adding 3,4′-oxydianiline to the 4,4′-oxydiphthalic anhydride and 3,4,3′,4′-biphenyltetracarboxylic dianhydride to form a mixture; (c) adding a solvent to the mixture to form a solution having a percentage of solids effective in maintaining polymer solubility, wherein the solvent is selected from the group consisting of: polar aprotic and polar protic; (d) stirring the solution at room temperature to allow the 3,4′-oxydianiline, 4,4′-oxydiphthalic anhydride and 3,4,3′,4′-biphenyltetracarboxylic dianhydride to react; (e) adding an azeotropic solvent to the solution and heating the solution to a temperature effective in removing water; (f) cooling the solution to room temperature and recovering the tough, soluble, aromatic thermoplastic copolyimide.