Electrophotographic reproduction sheet and composition containing photoconductive material and coarse filler particles

Abstract

Abstract AN ELECTROPHOTOGRAPHIC PAPER MADE TO SIMILATE A GOOD GRADE OF BOND PAPER BY EMBEDDING IN THE ELECTROPHOTOGRAPHIC LAYER, DISCRETE SOLID, WATER-INSOLUBLE, RELATIVELY NON-PHOTOCONDUCTIVE (COMPARED TO PHOTOCONDUCTIVE ZINC OXIDE), RELATIVELY COARSE (COMPARED TO THE PARTICLES OF ZINC OXIDE PHOTOCONDUCTOR) FILTER PARTICLES OF IRREGULAR SHAPE, PREFERABLY A MINERAL OR MIXTURE OF MINERALS, HAVING AT LEAST ONE CROSS-SECTIONAL DIMENSION NOT SUBSTANTIALLY LESS THAN 5, MORE PREFERABLY NOT SUBSTANTIALLY LESS THAN 10, MICRONS BUT HAVING A MAXIMUM PARTICLE SIZE OF 50 OR 60 MICRONS. THESE FILLER PARTICLES PROTRUDE FROM THE ELECTROPHOTOGRAPHIC SURFACE TO SHARPLY DECREASE THE SMOOTHNESS OF TEXTURE THEREOF (INCREASING ROUGHNESS AND FRICTION) AND THE SLIMY, LEADEN QUALITY OF THE PAPER TO PROVIDE FOR THE FIRST TIME AN ELECTROPHOTOGRAPHIC PAPER SIMILATING A GOOD BOND PAPER. ALSO, SINCE THE FILLER REPLACES PART OF THE ZINC OXIDE PHOTOCONDUCTOR PER UNIT VOLUME OF ELECTROPHOTOGRAPHIC LAYER AND IS ONLY A FRACTION OF THE COST OF THE ZINC OXIDE, THE COST OF THE PAPER IS SUBSTANTIALLY REDUCED. FURTHERMORE, SINCE THE FILLTER IS LESS DENSE THAN THE ZINC OXIDE AND IS IRREGULAR IN SHAPE, IT HAS A FLUFFING EFFECT AND DECREASES THE WEIGHT PER UNIT VOLUME OF THE ELECTROPHOTOCONDUCTIVE LAYER AND INCREASES THE BULK OF SUCH LAYER. FUTHERMORE, THE FILLER INCREASES THE STIFFNESS OF THE SHEET, I.E., DECREASES THE LIMPNESS THEREOF, TO FURTHER SIMILATE A GOOD GRADE BOND PAPER. ACCORDINGLY, THE SHEET IS EASIER TO HANDLE AND TO FILE.

Inventors

• 👤 Lee Allen Carlson

Bibliographic Details