Aromatic polymers
AssigneeImperial Chemical Industries PLC
InventorsDennis Arthur Barr, John Brewster Rose
Life of this patent
Estimating the term…
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 dihalogeno-benzenoid 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##
Claims5
A solid alkali metal salt of a member of the group consisting of 4-(4-halogenophenylsulfonyl) phenol and 4-(4-halogenobenzoyl) phenol, said salt being polymerizable by condensation polymerization.
A reactive diluent-free, solid alkali metal salt of a 4-(4-halogenophenylsulfonyl) phenol, said salt being polymerizable by condensation polymerization.
A solid comprising the salt of claim 17 and a low polymer of said salt, said polymer having a reduced viscosity of from 0.06 to 0.2 as measured at 25.degree. C on a 1% by weight solution in dimethyl formamide, said solid being polymerizable by condensation polymerization.
Dependencies are inferred from the claim text.