A family of high density (6–10 lbs/cu.ft.) free rise polyurethane foams has been created as an alternative to more traditional siloxane, epichlorohydrin elastomer and other elastomer-based polymers in laser printer roller applications. A wide range of resistivities, from 105 to 109 ohms, can be achieved through patented, innovative modifications to the polymer morphology. Such a low resistivity is very attractive for many digital imaging roller applications. In addition, many of these products exhibit a stable resistivity profile under voltage over extended time.
Joseph Lovette, Ken Overk, Peter Ferraro, "Innovative Polyurethane Materials for Use in Digital Imaging Equipment" in Proc. IS&T Int'l Conf. on Digital Printing Technologies and Digital Fabrication (NIP23), 2007, pp 65 - 67, https://doi.org/10.2352/ISSN.2169-4451.2007.23.1.art00018_1