Back to results
US 4,297,474 AGranted
Polyetherimides prepared by self-condensation of hydroxyaryl phthalimide salts
AssigneeGeneral Electric Company
InventorsFrank J. Williams, III, Howard M. Relles
Life of this patent
Estimating the term…
Abstract
Polyetherimides are provided which are based on the self-condensation in a dipolar aprotic solvent of a hydroxyaryl phthalimide salt having a nuclear bound leaving radical on the phthalimide ring. The polyetherimides are injection-moldable high performance thermoplastics.
Claims7
Polyetherimides comprising chemically combined units of the formula, ##STR11## where R is a trivalent C.sub.(6-13) aromatic organic radical, R.sup.1 is a divalent C.sub.(6-30) aromatic organic radical and X is selected from --O--, or --S--.
A method for making polyetherimide which comprises
- (1) heating a mixture comprising a phthalimide salt of the formula, ##STR17## in a dipolar aprotic solvent, (2) allowing the mixture of (1) to cool to ambient temperatures and
- (3) effecting the precipitation of polyetherimide from the mixture of (2), where R is a trivalent C.sub.(6-30) aromatic organic radical, R.sup.1 is a divalent C.sub.(6-30) aromatic organic radical, X is selected from --O--, or --S--, and M is an alkali metal ion or an ammonium salt.
Dependencies are inferred from the claim text.