Browse Prior Art Database

PURIFICATION OF BENZIMIDAZOLE PERYLENE BY BASE SOLUBILIZATION

IP.com Disclosure Number: IPCOM000026410D
Original Publication Date: 1991-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 69K

Publishing Venue

Xerox Disclosure Journal

Abstract

A method for chemical purification of benzimidazole perylene by base solubilization for producing the photoconductive pigment of high purity for photoreceptor applications is disclosed. The method comprises the steps as exemplified in the following example.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 84% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

PURIFICATION OF Proposed Classification BENZIMIDAZOLE PERYLENE BY U.S. C1.430/059 BASE SOLUBILIZATION
Peter M. Kazmaier
Erwin Buncel
Andrew J. McKerrow
Ah-Mee Hor
Richard A. Burt

Int. C1. G03g 05/06

A method for chemical purification of benzimidazole perylene by base solubilization for producing the photoconductive pigment of high purity for photoreceptor applications is disclosed. The method comprises the steps as exemplified in the following example.

Benzimidazole perylene (2.0 g) was suspended in 400 mL of 3M KOH solution (90% ethanol/lO% water). The mixture was refluxed (1.5 hours), cooled to room temperature, and then filtered through a 10 micron poly( tetrafluorinated ethylene) membrane filter. The residue was then refluxed with 400 mL of 3M KOH solution (85% ethanol/l5% water) (1 hour), cooled, and filtered through a 10 micron poly(tetraflu0rinated ethylene) filter. The combined filtrates were filtered through a 3 micron Millipore membrane to remove a small amount of material which precipitated on standing. The pigment was regenerated by adding dry ice to a vigorously stirred solution of the pigment. During the addition, the solution congealed into a pasty mass, which gradually became less viscous with time. After the dry ice addition was complete, the pH was neutral. The pigment was isolated by filtration, washed with de-ionized water (3 x 150 mL) and dried to constant weight (LOlg, 50.5%).

The base treatment method provides a pig...