Patent ID: 7601780

Claim:
A polymer composition comprising a polymer and a treated powder, wherein the treated powder has improved loose bulk density and comprises a silanized inorganic powder, selected from the group consisting of titanium dioxide and zinc oxide which has been silanized with a silane having the formula: R 1 x Si(R 2 ) 4−x wherein: R 1 is a nonhydrolyzable aliphatic, cycloaliphatic or aromatic group having at least 1 to about 20 carbon atoms; R 2 is a hydrolyzable group selected from the group consisting of alkoxy, halogen, acetoxy or hydroxy or mixtures thereof; and x is an integer of 1 up to and including 3, treated with a long chain fatty acid or salt thereof, wherein the amount of the long chain fatty acid is about 0.25% to about 2 wt %, based on the total weight of the treated powder and wherein the loose bulk density of the treated powder is greater than the loose bulk density of an untreated silanized inorganic powder.