Patent ID: 6570038
Filing Date: 2003-05-27
Classification: C07C,C08G

Abstract:
A method for preparing a polyetherimide or intermediate thereof which comprises the steps of:(P) removing substantially all water from a mixture comprising: an organic solvent of low polarity; an imide having the formula wherein A is a trivalent aromatic radical, R1 is an unsubstituted or substituted mono- or divalent hydrocarbon radical containing about 1-13 carbon atoms, X1 is halo or nitro and q is 1 or 2; an aqueous solution of a hexasubstituted guanidinium chloride and optionally an alkali metal chloride to form an anhydrous mixture comprising said hexasubstituted guanidinium chloride, said organic solvent and said imide; wherein said mixture comprises not greater than about 50 ppm by weight water; (R) preparing, in an organic solvent of low polarity, an anhydrous mixture comprising said hexasubstituted guanidinium chloride; an alkali metal salt of a dihydroxyaromatic compound; said imide; and optionally an alkali metal chloride; and (S) effecting reaction in said anhydrous mixture between said alkali metal salt and said imide.