Direct positive fogged silver halide emulsion sensitized with a cyclo-heptatriene cyanine dye

Abstract

Abstract 5-(O=)CYCLOPENT-1-ENE 1-((-Z2-N(+)(-R)=(CH-CH)M=)>C-L2-L1-),2,3-(-Z-),4-Z1, A DIRECT POSITIVE SILVER HALIDE EMULSION COMPRISING AT LEAST ONE DYE OF THE FORMULA: WHEREIN Z IS AN ORGANIC SUBSTITUTED OR UNSUBSTITUTED ATOMIC GROUP NECESSARY TO COMPLETE A CYCLOHEPTATRIENE RING, WHICH MAY BE OPTIONALLY SUBSTITUTED WITH A TROPONOID COMPOUND; Z1 IS AN OXYGEN ATOM OR N-H; ZI IS AN ORGANIC SUBSTITUTED OR UNSUBSTITUTED ATOMIC GROUP NECESSARY TO COMPLETE A 5 OR 6 MEMBERED HETEROCYCLIC RING; R IS A MEMBER OF THE ALKYL SERIES SELECTED FROM THE GROUP CONSISTING OF LOWER ALKYL, HYDROXY (LOWER) ALKYL, LOWER ALKOXY, SULFO (LOWER) ALKOXY, VINYL, METHYL ARALKYL AND SULFO ARALKYL; L1 AND L2 ARE A GROUP FROM THE METHINE SERIES, SAID L2 CAPABLE OF FORMING A METHYLENE CHAIN TOGETHER WITH SAID R; X IS AN ANION, AND M AND N EACH IS 0 OR 1, PROVIDING THAT N IS 0 WHEN THE DYE FORMS AN INTRAMOLECULAR SALT, AND A PHOTOGRAPHIC LIGHT-SENSITIVE ELEMENT FORMED FROM SAID EMULSION. THE PRESENT INVENTION ALSO EXTENDS TO THE DYES THEMSELVES AND A PROCESS FOR PREPARING THE SAME.

Inventors

• 👤 Akiro Sato
• 👤 Minoru Sonoda
• 👤 Keisuke Shiba
• 👤 Mansanao Hinata
• 👤 Tetsuo Nozoe

Bibliographic Details