Process for the preparation of...

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C - Chemistry, Metallurgy

07

C

260/597.7

C07C 315/04 (2006.01) C07C 317/32 (2006.01) C07C 317/22 (2006.01)

Patent

CA 2034637

23443-445 ABSTRACT A process for the preparation of 4,4'-bis(4-amino- phenoxy)diphenyl sulfone of high purity is disclosed. The process comprises converting 4-aminophenol to the corresponding alkali metal phenolate with an alkali metal hydroxide, reacting the phenolate with a 4,4'-dihalogenodiphenyl sulfone in an organic solvent at 120° to 200°C, precipitating the product by means of a precipitant and separating it off. By using specific narrow molar ratios of alkali metal hydroxide to 4-aminophenol and of 4-aminophenol to 4,4'-dihalogenodiphellyl sulphone and by using a dialkylamide as solvent, products having melting points above 195°C are obtained without recrystallization. The product is use- ful as monomer for the preparation of high-melting polyamides, polyimides and polyamidoimides and as a curing agent of epoxides.

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