Abstract: Aromatic polymers comprise divalent aromatic units connected by ether and/or thioether linkages. At least one of such units carries at least one halogen radical linked to a nuclear carbon by a halogen-carbon bond or a functionalized derivative thereof linked to a nuclear carbon atom by a carbon-carbon bond.

Abstract: An aromatic polymer comprises divalent aromatic units linked through oxygen, characterized in that some at least of those units are or contain aromatic rings free of electron-withdrawing groups and in that at least one of such rings carries at least one nitrogen radical linked to a nuclear carbon atom by a nitrogen-carbon bond.Preferably it consists to the extent of at least 75 mol percent by the repeating units:O--Ph'--O--Ph--A--Ph Ialone or in combination withO--Ph--A--Ph--O--Ph--A--Ph IIwherePh is paraphenylene;Ph' is phenylene, at least some of groups Ph' carrying a nitrogen radical;A is SO.sub.2 or CO; andthe As can be the same or different in the polymer chain.A process is provided which comprises nitrating a parent polymer and optionally reducing nitro groups to amino followed optionally by substitution of amino.

Abstract: A thermoplastic polymeric material comprises a copolymer which is a poly(bisphenol A tere-and/or-isophthalate) copolymer having a molar ratio of phthalate to carbonate units in the inclusive range from 2 to 10, preferably 3 to 8. The material, which may be prepared by techniques which are known, may be used in applications for high temperature transparent thermoplastics, e.g. transparencies for the aerospace industry.

Abstract: A thermoplastic polymeric material comprises a copolymer which is a poly(bisphenol A tere- and/or isophthalate) copolycarbonate having a molar ratio of phthalate to carbonate units in the inclusive range from 2 to 10, preferably 3 to 8. The material, which may be prepared by techniques which are known, may be used in applications for high temperature transparent thermoplastics, eg transparencies for the aerospace industry.