Titanium dioxide particles
A technology of titanium dioxide and particles, applied in the field of personal care products, can solve the problem of unacceptable transparency
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Embodiment 1
[0144] 1 mol of titanium oxychloride in acidic solution was reacted with 3 mol of NaOH in aqueous solution. After the initial reaction period, the temperature was raised above 70°C and stirring was continued. The reaction mixture was neutralized by addition of aqueous NaOH and allowed to cool below 70°C. After filtration, the resulting filter cake of precursor titanium dioxide particles was further dried to 20 wt% water using a rotary dryer operating at 6 rpm. This material was fed using a screw conveyor to a rotary calciner operating at 610°C with a residence time of 20 minutes. The treated titanium dioxide was pulverized into a fine powder using an IKA Werke dry powder mill operating at 3250 rpm. The powder was reslurried in deionized water. To the resulting slurry is added an alkaline solution of sodium aluminate, based on TiO 2 Weight equivalent to 5wt% Al 2 o 3 , while keeping the pH below 11. The temperature was maintained below 60°C during the addition. Then rai...
Embodiment 2
[0191] Titanium dioxide particles were produced according to the procedure of Example 1 except that no alumina / stearate coating was applied. A dispersion was produced according to the procedure of Example 1 except that 4 g of polyhydroxystearic acid, 56 g of C12-C15 alkyl benzoate and 40 g of the dry calcined titanium dioxide powder produced above were used.
[0192] The titanium dioxide dispersion was subjected to the test procedure described herein and exhibited the following properties:
[0193] Extinction coefficient:
[0194]
Embodiment 3
[0196] By mixing 6.2g of polyglyceryl-2 caprylate, 2.6g of sucrose stearate, 2g of jojoba oil, 0.6g of squalane, 1g of octyl caprylate, 37.4g of deionized water, and then adding 50g of Example Titanium dioxide powder prepared in 1, resulting in an aqueous dispersion. The mixture was passed through a horizontal ball mill operating at 4,500 rpm and containing zirconia balls as grinding media for 60 minutes.
[0197] The titanium dioxide dispersion was subjected to the test procedure described herein and exhibited the following properties:
[0198] Extinction coefficient:
[0199]
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