Patent ID: 7550240

Claim:
A Newtonian, ultrasonic-insensitive charge generation dispersion composition comprising at least one finely-divided pigment, polyvinyl butyral containing moieties of butyral, vinyl alcohol and vinyl acetate wherein the polyvinyl butyral copolymer contains from about 75 to less than 88 mole percent butyral, from about 5 to about 20 mole percent vinyl alcohol and from about 0.5 to about 5 mole percent vinyl acetate and a polyester ionomer wherein the composition has a low shear viscosity (measured at 0.5 s-1) to high shear viscosity (measured at 1000 s-1) ratio from about 1 to about 3.0 and wherein the viscosity ratio is either retained or decreased after sonication.