Oblon, Spivak, McClelland, Maier & Neustadt
Silicon naphthalocyanines with unsaturated ligands and optical recording medium
 An optical recording medium contains silicon naphthalocyanines of the formula ##STR1## where Nc is the radical of a naphthalocyanine system which may be substituted by alkyl, alkoxy, aryl or aralkyl, and PA0 R.sup.1 and R.sup.2 are each independently of the other a radical of the formula (O).sub.n R.sup.3, where n is 0 or 1 and R.sup.3 is an unsubstituted radical, or ##STR2## where R.sup.3 is as defined above and R.sup.4 and R.sup.5 are each independently of the other alkyl, alkoxy or (O).sub.n R.sup.3 or R.sup.1 is alkyl. 
BASF Aktiengesellschaft
C C Y G
C09B C09B Y10S G11B
inventional inventional additional inventional
Peter Sibylle Bernhard
Neumann Brosius Albert