Patent ID: 7334458

Claim:
A method for detecting the PTFE concentration of a photoreceptor layer forming dispersion comprising: (a) providing a known amount of dispersion comprising polymer binder, solvent and PTFE particles; (b) optionally diluting the dispersion; (c) centrifuging the dispersion to provide a sediment comprising said PTFE particles and a supernatant; (d) removing the resultant supernatant; (e) at least once after (d), adding additional diluent to the sediment and redispersing the resultant sediment in the diluent; (f) for each time (e) is conducted, repeating (c) and (d); (g) following completion of a final (d), drying the sediment; (h) weighing the dried sediment to determine PTFE concentration of the dispersion; (i) after determining the PTFE concentration of the photoreceptor layer dispersion, adjusting the PTFE concentration in the photoreceptor layer dispersion; and (j) applying the photoreceptor dispersion as a coating during the manufacture of a photoreceptor to form a charge transport layer or an anti-curl backing layer therein.