Rohm and haas patents

Patent No. U.S. 6,921,432 B2
Rohm and Haas Company has been granted a patent for a fluid extender pigment mixture, comprising at least one extender pigment; at least one thickener; and optionally at least one binder wherein the extender pigment has an average particle size of less than three μm and an average oil adsorption value as measured by ASTM D281-31 of less than 30; wherein the mixture has a pigment volume concentration of at least 80, a volume solids of no greater than 50, a specific gravity of less than 3 g/cc and a viscosity at a frequency of 1.25 sec-1 of at least 10,000 cps.