ELECTROCONDUCTIVE COMPOSITE BRUSH FIBERS
Original Publication Date: 1993-Dec-31
Included in the Prior Art Database: 2004-Apr-06
Xerox Disclosure Journal
Disclosed are electroconductive composite brush fibers for use, for example in brush cleaning systems of electrophotographic printing and copying machines. As shown in the Figures, the brush fibers 1 are comprised of conductive chopped carbon fiber filler particles 2 that are dispersed in a continuous polymeric matrix 3. The performance properties of the brush fibers 1 may be modified by selection of, for example, polymer matrix type; carbon fiber type and dimensions; filler loading percentages and processing conditions. The polymer matrix phase 3 is from about 70 to 95 percent weight of the total fiber weight and includes, for example, NYLON 610, NYLON 612, PET polyester, ULTEM, mixtures thereof, and the like. The brush fibers 1 have a diameter W from about 30 to 60 microns and a length L greater than about 1 inch. The chopped carbon fiber filler particles 2 typically have a diameter W from about 7 to 10 microns and a length L' from about 0.005 to 0.375 inches. Examples of suitable chopped carbon fibers include CELION C-6000, C-3000, C-12,000, metal coated carbon fibers, chopped fiber glass, and the like, and mixtures thereof. The chopped fibers may be either random or oriented within the polymer matrix 3. The composite fibers may be prepared by known conventional processes such as melt belting the chopped fibers 2 into a suitable polymer phase, followed by melt extrusion and spinning or drawing into fine fibers. The resulting fibers may be processed further with, for example, heat setting or weaving prior to fashioning into a final cleaning brush article.