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Certification of CDB Disclosure Number: IPCOM000062557D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09

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Chen, HH Ciecior, GH [+details]


The molecule CDB (chlorodiane blue), which is useful as the charge- generating molecule of electrophotographic photoconductors, is subjected to impurity extraction techniques, and the impurities are then evaluated by the use of tristimulus measurement. In this way, acceptable lots of CDB are screened from unacceptable lots (i.e., low sensitivity CDB). A weight amount of 0.05 gram of CDB is placed in a l0 to 30 ml glass vial. About 5.0 ml of 2% ethylenediamine in acetonitrile is then placed in the vial, and the vial is capped using a polyethylene cap. The vial is then adequately shaken, for example, for l5 minutes. The vial's contents are then filtered through a 0.5 m TEFLON* filter. The tristimulus values Rd, a, and b of the filtrate are immediately measured, using a l cm quartz cell. If, for example, Rd>84 and a<-3.