Reactant Contains A (o=)s(=o)-halo Group Patents (Class 528/175)
  • Production of aromatic polyethers
    Patent number: 4105636
    Abstract: Aromatic polyethers are made by boiling an organic sulphoxide or sulphone solvent containing i) an equimolar mixture of a bisphenol and an aromatic dihalo compound or ii) a halophenol, in which dihalo compound or halophenol the halogen atoms are activated by ortho or para --SO.sub.2 -- or --CO-- groups, and an alkali metal carbonate with removal of the water produced by the reaction by distillation in the absence of an azeotrope forming solvent.
    Type: Grant
    Filed: July 11, 1977
    Date of Patent: August 8, 1978
    Assignee: Imperial Chemical Industries Limited
    Inventor: Ian C. Taylor
  • Manufacture of aromatic polymers containing ketone and sulphone groups
    Patent number: 4105635
    Abstract: Aromatic polyetherketones and polyether sulphones are prepared from a hydrated alkali metal bisphenate by heating a substantially equimolar mixture of the bisphenate and an activated aromatic dihalide in the presence of an aromatic sulphone to distil off the water, preferably at atmospheric pressure, and then heating at temperatures in the range 250.degree. to 400.degree. C. to effect polymerization.
    Type: Grant
    Filed: June 28, 1977
    Date of Patent: August 8, 1978
    Assignee: Imperial Chemical Industries Limited
    Inventor: John L. Freeman