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Method of Quantifying Carbon Black In The Presence of Organic Materials And Iron Oxide

IP.com Disclosure Number: IPCOM000048737D
Original Publication Date: 1982-Mar-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Alter, PC: AUTHOR

Abstract

The carbon black content of a material sample including organic materials and iron oxide is determined by a sequence of steps including chloroform dissolution of polymers and hydrochloric acid dissolution of iron oxide with interspersed steps of centrifuge separation. The process is particularly useful for determining the carbon black content of copier toner materials including monocomponent toners.

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Method of Quantifying Carbon Black In The Presence of Organic Materials And Iron Oxide

The carbon black content of a material sample including organic materials and iron oxide is determined by a sequence of steps including chloroform dissolution of polymers and hydrochloric acid dissolution of iron oxide with interspersed steps of centrifuge separation. The process is particularly useful for determining the carbon black content of copier toner materials including monocomponent toners.

In copiers and especially monocomponent toner-type copiers, carbon black loading relates to electrostatic performance. Analysis of the carbon black content is difficult because of the complex mixture of organics (polymers and dyes) and iron oxide along with the carbon black. Thermogravimetric analysis accurately determines the amount of polymers, but reduced iron oxide causes weight gain, and also forms steel with the carbon black, even in an inert atmosphere. This problem is avoided by the present method which is a gravimetric procedure using multiple, differential centrifugation of whole monocomponent toners and the like.

In a typical application, a 50 mg sample of monocomponent toner is placed in a glass centrifuge tube. Chloroform or whatever appropriate solvent is added, and the sample agitated and centrifuged at 5000 gravities with a horizontal rotor. The supernatant is removed, and the process repeated five additional times. This removes the organics present including polymer...