u00b0 c the slurry ph was adjusted to 7 0 using a 50 sodium hydroxide solution and the slurry was allowed to age for 30 minutes with stirring the aged slurry was filtered and washed three times with 5000 ml aliquots of 80 u00b0 c deionized water and then dried overnight at 115 u00b0 c in an oven the dried filter cake was forced through an 8 mesh screen in preparation for treatment with diisooctylphosphinic acid 10 0 grams of diisooctylphosphinic acid fluka chemical were added drop wise in a circular motion to 1000 grams of the dry 8 meshed alumina coated tio 2 prepared as described above which was spread to a 1 cm thickness on polyethylene film the pigment was mixed with a large spatula and transferred to a one gallon wide mouthed nalgene bottle the bottle containing pigment was rolled for 10 minutes on a roller mill the rolled pigment was steam micronized to produce the finished pigment the finished pigment was incorporated into 75 and 50 tio 2 containing low density polyethylene masterbatch for dispersion and lacing evaluations respectively results are given in table 1 in this example 1 36 of diisooctylphosphinic acid is added to dry sulfate process rutile tio 2 base which was coated with 0 40 alumina 13 6 grams of diisooctylphosphinic acid fluka chemical were added drop wise in a circular motion to 1000 grams of the dry 8 meshed alumina coated tio 2.