An electrographic liquid developer and method of making same
An electrographic liquid developer includes a fluorescent toner diluted in a liquid developer vehicle which has a high flash point and a low vapor pressure. The liquid developer vehicle preferably is a mixed liquid alkane which has a flash point over 140 DEG F and a vapor pressure less than 0.1. The...
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| Format: | Patent |
| Sprache: | eng ; fre ; ger |
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| Zusammenfassung: | An electrographic liquid developer includes a fluorescent toner diluted in a liquid developer vehicle which has a high flash point and a low vapor pressure. The liquid developer vehicle preferably is a mixed liquid alkane which has a flash point over 140 DEG F and a vapor pressure less than 0.1. The fluorescent toner is preferably made as follows: a solution is prepared which comprises an organic solvent, a fluorescent dye, and an organic polymer. A pigment is precipitated by mixing the solution with a non-solvent for the polymer in the presence of a dispersant. The pigment is melt-compounded with a polymeric organic binder and the melt-compounded mixture is continuted. |
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