Eastman-kodak Company

Paul S Gloyer

George R Walgrove, Iii

Eric C Stelter

William B Vreeland

Alan Richard Priebe

Joseph E Guth

M Cristina B Dejesus

Disclosed herein are polyurethane elastomers and shaped articles prepared therefrom comprising charge-control agents to provide electrical conductivity to the elastomers, thereby allowing for their use in electrophotographic processes. The elastomers comprise a polyisocyanate prepolymer, a polyether prepolymer, and a hardener mixture comprised of at least one additional polyol and a charge-control agent. When used in an electrophotographic process, the elastomers are capable of exhibiting resistivities of less than 6&#xd7;10ohm-cm for 600,000 images or more.

Polyurethane elastomers and shaped articles prepared therefrom

An electrographic machine has a transfer station where a toner image is transferred to a receiver sheet. That sheet travels at a high speed of more than 15 inches per second and up to as high as 35 inches per second. A transfer roller has a metal core and an elastomeric sleeve with a resistivity selected to optimize transfer of toner at high speeds. The resistivity of the sleeve is selected to be high enough to support transfer of the toner but not so high as to cause the surface voltage to exceed the breakdown voltage of the dielectric material that includes the elastomeric sleeve, the receiver sheet, the toner and the photoconductor.

Transfer roller with resistivity range

Growing community of inventors

Nashville, TN, United States of America

Paul S Gloyer