Abstract: Mixtures of metallocenyl phthalocyanines obtainable by reacting a mixture A comprising two phthalocyanines: with a metallocene derivative in the presence of a catalyst, and also oligomeric metallocenyl phthalocyanines, processes for preparing them, their use for, inter alia, optical recording and optical recording media.

Abstract: Mixtures of metallocenyl phthalocyanines obtainable by reacting a mixture A comprising two phthalocyanines (I) and (II) with a metallocene derivative in the presence of a catalyst, and also oligomeric metallocenyl phthalocyanines, processes for preparing them, their use for, inter alia, optical recording and optical recording media

Abstract: Mixtures of metallocenyl phthalocyanines obtainable by reacting a mixture A comprising two phthalocyanines: with a metallocene derivative in the presence of a catalyst, and also oligomeric metallocenyl phthalocyanines, processes for preparing them, their use for, inter alia, optical recording and optical recording media.

Abstract: Mixtures of metallocenyl phthalocyanines obtainable by reacting a mixture A comprising two phthalocyanines (I) and (II) with a metallocene derivative in the presence of a catalyst, and also oligomeric metallocenyl phthalocyanines, processes for preparing them, their use for, inter alia, optical recording and optical recording media.

Abstract: The present invention provides a flexible cable and support band assembly which is dynamically stable at high speeds over long lengths. This has been accomplished by cupping both the flexible cable and the support band in cross section along their lengths so that they cup one within the other to essentially move as a unit even though they are not attached except at their ends. A single support band can be employed to support multiple flexible cables. Additional support has been provided by employing resilient spaced apart strips along a track upon which the one or more flexible cables and support band slide. The resilient strips center the travel of the one or more flexible cables and support band and minimize rocking motion and vibration. Still further the one or more flexible cables and support band are arranged with respect to a robotic media library so that a single length of the one or more flexible cables and the support band will serve a range of lengths of the library.

Abstract: The present invention provides a flexible cable and support band assembly which is dynamically stable at high speeds over long lengths. This has been accomplished by cupping both the flexible cable and the support band in cross section along their lengths so that they cup one within the other to essentially move as a unit even though they are not attached except at their ends. A single support band can be employed to support multiple flexible cables. Additional support has been provided by employing resilient spaced apart strips along a track upon which the one or more flexible cables and support band slide. The resilient strips center the travel of the one or more flexible cables and support band and minimize rocking motion and vibration. Still further the one or more flexible cables and support band are arranged with respect to a robotic media library so that a single length of the one or more flexible cables and the support band will serve a range of lengths of the library.

Abstract: Process for the preparation of 1,4-diketopyrrolo[3,4-c]pyrroles of the formula I ##STR1## in which R.sub.1 and R.sub.2 independently of one another are phenyl, biphenyl or naphthyl radicals or aromatic O-heterocyclic, S-heterocyclic or N-heterocyclic radicals, by reacting 1 mole of a dicyclohexyl succinate, dialkyl succinate, monoalkylmonophenyl or diphenyl succinate, alkyl in the succinic acid ester radical being C.sub.1 -C.sub.18 alkyl and phenyl being phenyl which is unsubstituted or substituted by one or two halogen atoms or one or two C.sub.1 -C.sub.6 alkyl or C.sub.1 -C.sub.6 alkoxy groups, with 2 moles of a nitrile of the formula II or III or with 1 mole of a nitrile of the formula II and 1 mole of a nitrile of the formula III ##STR2## in which R.sub.1 and R.sub.