Abstract: A non crosslinked, covalently crosslinked and/or ionically crosslinked polymer, having repeating units of the general formula (1) —K—R—??(1) In which K is a bond, oxygen, sulphur, the radical R is a divalent radical of an aromatic or heteroaromatic compound.

Abstract: A method for lateral chain modification of aryl main chain polymers with aromatic ketones or aldehydes containing tertiary basic N-groups is described. The modification can be accomplished via addition of an aromatic carboxylic acid or an acid derivative containing a tertiary amine moiety to a metallized polymer. The tertiary amines on the modified polymer can be converted to quaternary amines with halogen alkanes. Modification of the aryl main chain polymers with aromatic groups containing sulphonic acid radicals is also described. The polymers formed can be crosslinked and prepared for use in a wide variety of membrane technologies including ion exchange, dialysis, reverse osmosis, nanofiltration.

Abstract: A method for producing a high resolution, multi-color recording medium comprises the steps of applying a photosensitive masking layer to a substrate, exposing the masking layer, and then developing the masking layer to expose a patterned portion of the underlying substrate. A reflecting layer is then applied over the remaining masking layer and exposed substrate, and then the remaining masking layer is removed, leaving only that portion of the reflecting layer directly over the substrate. A uniformly thick interference layer is then applied over the substrate and the remaining portion of the reflecting layer, and a second reflecting layer is then applied using the same procedures described above in connection with the first reflecting layer.