URETHANE POWDER COATING ON AGED DEVELOPER
Original Publication Date: 1993-Oct-31
Included in the Prior Art Database: 2004-Apr-06
Xerox Disclosure Journal
A method for preparing heavy metal containing xerographic developers for non-leaching disposal is disclosed. The method comprises pelletizing, aggregating and encapsulating copper/zinc ferrite carriers in a polyurethane surface coating or polyurethane matrix. The carrier or developer is mixed with 5 weight percent powdered polyurethane for approximately 5 minutes. This coated material is pressed into a disk and then fused in an oven at 380°F for about 10 minutes then cooled. This resulting disk is large enough and strong enough to pass certain environmental regulations for sanitary landfill disposal. The disks are clean, for example, the carbon black is tied up in the polymer matrix, so the disks could be handled easily, and could be used in applications such as fillers in concrete. Also, when heating toner alone to temperatures greater than 200"F, decomposition occurs, but when mixed with urethane as in the present disclosure there was no noticeable decomposition of the toner.