Cosmetic compositions with agglomerated substrates
AssigneeLancaster Group GmbH
InventorsKarin Golz-Berner, Leonhard Zastrow
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Abstract
The invention relates to cosmetic compositions containing agglomerates with particular particle sizes. The compositions are characterized in that they contain spherical non-porous SiO2 particles with a particle size of 0.05-1.5 μm, and other inorganic particle-shaped materials with spherical structure. The spherical SiO2 and other inorganic materials form defined agglomerates with a particle size of 0.06 μm to 5 μm. The proportion of agglomerates in the cosmetic composition is between 0.1 and 30% wt. The aggregate-containing dispersions are produced by introducing the spherical SiO2 step by step and in special conditions. Formulations produced with these aggregates are characterized by particularly stable and high sunscreen factors.
Claims11
Sunscreen composition containing agglomerated substrates, comprising
- a content of spherical, non-porous SiO2 particles with a particle size ranging from 0.05 to 1.5 μm, and a content of other inorganic particle-shaped materials of spherical structure;
- wherein said other inorganic particle-shaped materials are zinc oxide and titanium dioxide;
- with the spherical SiO2 forming defined agglomerates with the other inorganic materials, of a particle size ranging from 0.06 μm to 5 μm and with the proportion of agglomerates in the sunscreen composition ranging from 0.1 to 30% wt;
- produced by mixing the spherical non-porous SiO2 particles with the other inorganic particle-shaped materials of spherical structure present dry or as an oily dispersion with a viscosity of 13,500 to 200,000 cps,
- wherein said other inorganic particle-shaped materials are zinc oxide and titanium dioxide;
- individually or mixed, maintaining a pH value of 5.5 to 7 such that part of the total water is to be added until a paste-like consistency is attained, with stirring for 20 to 100 minutes, with the remaining water subsequently being added while the pH value is maintained and homogenisation taking place at 3,000 to 5,000 rpm;
- with the temperature during the mixing processes ranging from 35 to 48° C., and with the dispersion obtained being worked into the sunscreen composition in the usual manner with the proportion of agglomerates in the sunscreen composition being between 0.1 and 30% wt.
A process for producing sunscreen compositions with agglomerated substrates, comprising
- intermixing of spherical non-porous SiO2 particles with a particle size ranging from 0.05 to 1.5 μm, with other inorganic particle-shaped materials of spherical structure,
- wherein said other inorganic particle-shaped materials are zinc oxide and titanium dioxide;
- to obtain defined agglomerates of a particle size of 0.06 μm to 5 μm, with the other inorganic particle-shaped materials with spherical structure which are present dry or as an oily dispersion with a viscosity of 13,500 to 200,000 cps being mixed together individually or as a mixture with the spherical non-porous SiO2 particles while maintaining a pH value of 5.5 to 7 such that part of the total water is to be added until a paste-like consistency is attained, with stirring for 20 to 100 minutes,
- with the remaining water subsequently being added while the pH value is maintained and homogenisation taking place for 20 to 60 minutes;
- with the temperature during the mixing processes ranging from 35 to 48° C., and with the dispersion obtained being worked into the sunscreen composition in the usual manner with the proportion of agglomerates in the sunscreen composition being between 0.1 and 30% wt.
Dependencies are inferred from the claim text.