METHOD FOR TRANSPORT SMALL MOLECULE RECLAIM FROM PHOTORECEPTORS
Original Publication Date: 1998-Feb-28
Included in the Prior Art Database: 2004-Apr-08
Xerox Disclosure Journal
Disclosed is a method for reclaiming the transport small molecule from photoreceptor devices as found in, for example, flexible belts and coated drum photoreceptors. The method comprises immersing the photoreceptor in solvent for specific time periods at temperatures from 0 to about 100°C and, as indicated by the relative solubility of the photoreceptor components, thereby extracting the transport small molecule from a polymer binder matrix, such as a polycarbonate coated MYLAR@ substrate. In an illustrative example, a belted photoreceptor article is immersed in a suitable organic solvent wherein the transport small molecule is selectively dissolved into the solvent phase. The transport small molecule is recovered by solvent evaporation and optionally further purified, such as by recrystallization or sublimation. Suitable solvents include acetone and related polar solvents, and aromatic solvents such as toluene. Suitable transport small molecules include known arylamine substituted benzidine compounds, such as a tetraaryl-substituted biphenyl diamine, for example, N7N-diphenyl-N,N-bis(3- hydroxypheny1)- l7l'-biphenyl-4,4'-diamine, also known as rn-TPD, perylenes, and the like compounds. The recovered transport small molecule can be reused in the manufacture of photoreceptor articles or selected for alternative uses.