Verfahren zur Herstellung von Polyarylenpolyaethern

摘要

1,133,561. Polyarylene polyethers. UNION. CARBIDE CORP. 6 April, 1966 [8 April, 1965], No. 15364/66. Heading C3R. Polyarylene polyethers are prepared by (a) contacting equimolar amounts of an alkali metal double salt of a dihydric phenol and a dihalobenzenoid compound having an inert electron withdrawing group in at least one of the positions ortho and para to the halogen atoms, with a solvent mixture comprising an azeotrope former and a solvent of formula R-S(O) z -R where R is a hydrocarbon group or two R groups are connected to form an alkylene group, and z is 1 or 2, the azeotrope former and solvent being in a weight ratio of from 10 : 1 to 1 : 1, (b) removing water as an azeotrope until the mixture is anhydrous, (c) removing excess azeotrope former until the ratio of azeotrope former to solvent is from 1 : 1 to 1 : 10, and (d) reacting the alkali metal double salt with the dihalobenzenoid compound in the solvent to form the polymer. The alkali metal double salt may be formed in situ. Polymers that may be prepared by the process include those of formula where Y is X is and Z is or or Y and Z are the same and are and X is or Y and Z are the same and are and X is or or In examples the dihydric phenols are bisphenol A, tetramethylene dibisphenol A and 4,41-dihydroxydiphenol ether, the dihalobenzenoid compounds are 4,41-dichlorodiphenylsulphone, 4,41-dichloroazobenzene, 4,41-difluoroazobenzene, 1,4-bis(p-chloro-N-methyl-benzenesulphonamido) - butane and piperazine bis - pchlorobenzenesulphonamide, the solvent is dimethylsulphoxide and the azeotrope former is chlorobenzene.