| abstract |
AN IMPROVED PROCESS FOR THE PRODUCING OF SENSITIZING DYES, E.G., CARBOCYANINE, MEROCYANINE, CHAIN-SUBSTITUTED CARBOCYANINES AND METHYLENE CHAIN-SUBSTITUTED POLYCARBOCYANINE AND MEROCYANINE DYES, ETC., WHEREIN AN ACTIVE METHYLENE-CONTAINING IS REACTED WITH AN AMMONIUM COMPOUND CONTAINING AN N-VINYL OR N-POLYVINYL OR N-METHYLENE OR N-PHENYL-URETHANE GROUP. ALTERNATIVELY, SUCH PROCESS IS CONDUCTED BY REACTING THE ACTIVE METHYLENE GROUP CONTAINING COMPOUNDS WITH AN IN SITU OR A PREFORMED INTERMEDIATE PRODUCED BY THE REACTION OF ETHYL CHLOROFORMATE AND AN ANILINOVINYL, POLYVINYL OR METHYLENE QUATERNARY AMMONIUM COMPOUND. |