Browse Prior Art Database

URETHANE POWDER COATING ON AGED DEVELOPER

IP.com Disclosure Number: IPCOM000026807D
Original Publication Date: 1993-Oct-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 59K

Publishing Venue

Xerox Disclosure Journal

Abstract

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.

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XEROX DISCLOSURE JOURNAL

URETHANE POWDER COATING ON AGED DEVELOPER U.S. C1.355/206 Thomas C. Dombroski
Thomas J. Budny
Egils Malitis
Donald J. Shuba

Proposed Classification

Int. C1. G03g 21/00

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.

XEROX DISCLOSURE JOURNAL - Vol.18,No. 5 September/October 1993 501

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502 XEROX DISCLOSURE JOURNAL - Vo1.18,No. 5 September /October 1993

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