| http://www.w3.org/ns/prov#value | - In a preferred embodiment, particularly useful or effective charge directors are metal alkyl sulphonates in which the metal ion is a bivalent metal ion selected from the group consisting of zinc(II), lead(II), cadmium(II), copper(II) and barium(IIA), or is a trivalent metal ion of the group VIII of the Periodic Table of the Elements, e.g., iron (III), or of the group VIB, e.g., chromium(III), and
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