Method for the preparation of bis(haloimides)
AssigneeGeneral Electric Company
InventorsJames Silva, Farid Khouri
Life of this patent
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Abstract
Bis(halophthalimides) are prepared in a solvent such as ortho-dichlorobenzene or anisole, by a reaction at a temperature of at least 150° C. between at least one diamine compound and at least one halophthalic anhydride in the presence of imidization catalyst. The reaction produces a vapor stream comprising solvent and water formed as a by-product of the imidization reaction. A suitable vapor handling system comprising a partial reflux condenser is used to recycle the solvent, maintain the reactant concentration, conduct the reaction at a higher temperature, and effect more efficient conversion of reactants to product bis(halophthalimides). Reaction conditions disclosed may also be used to prepare organic polyimides.
Claims22
A method for preparing a bis(halophthalimide), said method comprising steps (a)-(d):
- (a) contacting in a substantially water-immiscible solvent at least one halophthalic anhydride with at least one diamine to form a reaction mixture;
- (b) heating the reaction mixture to form a product mixture comprising the substantially water-immiscible solvent and a product bis(halophthalimide), and a vapor stream comprising the substantially water immiscible solvent and water;
- (c) introducing the vapor stream into a vapor handling system comprising a partial reflux condenser;
- and
- (d) separating the vapor stream to provide a water-rich component and a solvent-rich component.
A method for preparing a bis(chlorophthalimide), said method comprising steps (a)-(d):
- (a) contacting in a substantially water-immiscible solvent a mixture comprising at least one chlorophthalic anhydride and at least one diamine to form a reaction mixture;
- (b) heating the reaction mixture to form a product mixture comprising said solvent and at least one product bis(chlorophthalimide), and a vapor stream comprising the substantially water-immiscible solvent and water;
- (c) introducing the vapor stream into a vapor handling system comprising a partial reflux condenser;
- and
- (d) separating the vapor stream to provide a water-rich component and a solvent-rich component.
A method for preparing a bis(chlorophthalimide), said method comprising steps (a)-(d):
- (a) contacting in a solvent comprising ortho-dichlorobenzene a mixture comprising at least one chlorophthalic anhydride, meta-phenylene diamine, and para-phenylene diamine to form a reaction mixture;
- (b) heating the reaction mixture to form a product mixture comprising said solvent and product bis(chlorophthalimide) and a vapor stream comprising ortho-dichlorobenzene and water;
- (c) introducing the vapor stream into a vapor handling system comprising a partial reflux condenser;
- and
- (d) separating the vapor stream to provide a water-rich component and an ortho-dichlorobenzene-rich component.
A method for preparing an organic polyimide, said method comprising steps (a)-(d):
- (a) contacting in a substantially water-immiscible solvent a mixture comprising at least one dianhydride and at least one diamine to form a reaction mixture;
- (b) heating the reaction mixture to form a product mixture comprising the substantially water-immiscible solvent and a product organic polyimide, and a vapor stream comprising the substantially water-immiscible solvent and water;
- (c) introducing the vapor stream into a vapor handling system comprising a partial reflux condenser;
- and
- (d) separating the vapor stream to provide a water-rich component and a solvent-rich component.
Dependencies are inferred from the claim text.