Production of polyarylene ether sulphones and ketones
AssigneeImperial Chemical Industries PLC
InventorsDennis A. Barr, John B. Rose
Life of this patent
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Abstract
Aromatic polymers containing benzenoid groups and oxygen atoms in the polymer chains are made by the action of an alkali metal hydroxide on a dihalogenobenzenoid compound in which each halogen atom is activated by an inert electron-attracting group such as --SO.sub.2 --. When a bis-(4-halogenophenyl) sulphone is reacted with an alkali metal hydroxide, the alkali metal salt of a 4-(4-halogenophenylsulphonyl)phenol is formed as a readily isolated intermediate which polymerizes in the presence or absence of solvent to give a polymer having repeating units of the structure ##STR1##
Claims11
A process for preparing an aromatic polymer which comprises heating a condensed oligomer obtained by reaction in a solvent of a dihalo benzenoid compound of the formula ##STR14## wherein Z represents --SO.sub.2 or --CO--;
- X and X' are halogen atoms which are ortho or para to Z with a substantially equivalent amount of an alkali metal hydroxide followed by removal of solvent;
- said condensed oligomer being heated at 200.degree.-400.degree. C. under a nonreactive atmosphere in the substantial absence of a solvent.
A process for preparing an aromatic polymer which comprises heating a condensed oligomer having a reduced viscosity of 0.06 to 0.2 as measured in a 1% solution of said oligomer in dimethyl formamide at 25.degree. C. obtained by reaction in a solvent of a dihalo benzenoid compound of the formula ##STR15## wherein Z represents --SO.sub.2 -- or --CO--;
- X and X' are halogen atoms which are ortho or para to Z, with a substantially equivalent amount of an alkali metal hydroxide followed by removal of solvent;
- said condensed oligomer being heated at 200.degree.-400.degree. C. under a nonreactive atmosphere in the substantial absence of a solvent.
A process for preparing an aromatic polymer which comprises heating a condensed oligomer having units having the formula ##STR17## wherein Z represents --SO.sub.2 -- or --CO-- and the ether bond is ortho or para to Z;
- at 200.degree.-400.degree. C. under a nonreactive atmosphere in the substantial absence of a solvent.
A process for preparing an aromatic polymer which comprises heating a condensed oligomer having a reduced viscosity of 0.06 to 0.2 as measured in a 1% solution of said oligomer in dimethyl formamide at 25.degree. C. having units having the formula ##STR18## wherein Z represents --SO.sub.2 -- or --CO--;
- and the ether bond is ortho or para to Z;
- at 200.degree.-400.degree. C. under a nonreactive atmosphere in the substantial absence of a solvent.
Dependencies are inferred from the claim text.