Otsuka Chemical patents aqueous-medium dispersion

December 19, 2011

Patent No. U.S. 7,846,249 B2
Otsuka Chemical Co., Ltd. has been granted a patent for a pigment aqueous-medium dispersion being a dispersion of a pigment in an aqueous medium, wherein the pigment is a flaky titanic acid obtained by treating a layered titanate with an acid, reacting the treated layered titanate with an organic basic compound to swell or delaminate an interlaminar portion of the treated layered titanate and obtain an intermediate flaky titanic acid, and treating the intermediate flaky titanic acid with a metal alkoxide in an aqueous medium to obtain the flaky titanic acid, the flaky titanic acid having an average longer diameter of 5 to 30 μm and an average thickness of 0.5 to 300 nm.