Inorganic pigment composed of special spherical composite particles and serving as enhancer for sun screening
A technology of inorganic pigments and composite particles, which is applied in the field of inorganic pigments and can solve problems such as no further explanation
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Embodiment 1
[0241] A water-in-oil emulsion containing four organic UV absorbers was prepared.
[0242] Table 1 below shows the composition of the water-in-oil emulsions with organic UV-absorbers. Amounts are given in % by weight.
[0243] Table 1:
[0244]
[0245]
[0246]
[0247] Table 2: The fillers used were:
[0248]
[0249] Emulsion preparation:
[0250] Phases A and B were mixed separately and heated to 80°C. After reaching temperature, add phase B to A while stirring. The premix phase C is added and thereafter homogenized eg with an Ultra-Turrax T-50 at 5000 rpm for 1.5 minutes. After homogenization, the emulsion was allowed to cool to room temperature with continuous stirring and phases D and E were added sequentially with stirring until each was well dispersed.
[0251] One week after emulsion preparation, in vitro SPF assays were performed.
[0252] Measurement:
[0253] To determine the sun protection factor, 32.5 ± 0.5 mg of the emulsion was applied on a...
Embodiment 2
[0275] A water-in-silicone emulsion containing four organic UV absorbers was prepared.
[0276] Table 7 below shows the composition of the water-in-silicone oil emulsion with organic UV-absorbers. Amounts are given in % by weight.
[0277] Table 7:
[0278]
[0279]
[0280] Table 8: The fillers used were:
[0281]
[0282] Emulsion preparation:
[0283] Phases A and B were mixed separately and heated to 60°C. After reaching temperature, slowly add phase B to phase A while stirring. This was followed by homogenization with a blade stirrer at 2000 rpm for 2 minutes. Add phase C and homogenize with a blade stirrer at 2000 rpm for 2 minutes. Add phase D with stirring and homogenize with a blade stirrer at 1000 rpm for 2 minutes.
[0284] In vitro SPF assays were performed one week after emulsion preparation. Measurements were performed as described in Example 1.
[0285] Table 9: In vitro SPF results:
[0286]
Embodiment 3
[0288] A gel containing two encapsulated organic UV absorbers was prepared. The organic UV absorber of described package is under the trade name of Merck UV OB-S is commercially available.
[0289] Table 10 below shows the composition of the gel with two encapsulated organic UV absorbers. Amounts are given in % by weight.
[0290] Table 10:
[0291]
[0292]
[0293] Table 11: The fillers used were:
[0294]
[0295] Emulsion preparation:
[0296] Add phase A to phase B under stirring and then homogenize with eg Ultra-Turrax T-50 at 5000 rpm for 1.5 minutes. Phases C and D were added sequentially with stirring until each was well dispersed.
[0297] In vitro SPF assays were performed one week after emulsion preparation. Measurements were performed as described in Example 1.
[0298] Table 12: In vitro SPF value results:
[0299]
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