Composite particles for use in oral hygiene
First Claim
1. Composite particles as additives for toothpaste and mouthwash, wherein the particles comprisea porous carrier of amorphous SiO2, having an average particle size of 3 to 50 pm, and a specific surface area of between 50 and 550 m2/g,at least one active ingredient, or a combination thereofand at least one envelope material, wherein the at least one envelope material releases an active ingredient following activation in the oral chamber,wherein the weight ratio of the envelope material or the sum of the envelope materials to the active ingredient or the sum of the active ingredients is in the range from 10:
- 1 to 1;
10,wherein at least one envelope material is selected such that the active ingredient is released in the oral cavity by diffusion, pH change, enzymatic degradation of the envelope material, temperature change, ion exchange or dissolution of the envelope materialand wherein, as demonstrated by XPS analysis of the outermost atomic layers of the composite particles, the porous carrier is not completely encapsulated by the envelope material, and at least 10% of the outer surfaces of the composite particles are formed by the porous carrier.
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Accused Products
Abstract
The present invention relates to functional composite particles for the oral care sector, more particularly for toothpastes and mouthwashes, which are charged with active ingredients which ensure a long-term antimicrobial or antibacterial effect in the oral cavity and hence reduce the formation of plaque and halitosis. The invention further relates to a process for producing these composite particles and also to their use for producing oral hygiene articles.
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Citations
19 Claims
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1. Composite particles as additives for toothpaste and mouthwash, wherein the particles comprise
a porous carrier of amorphous SiO2, having an average particle size of 3 to 50 pm, and a specific surface area of between 50 and 550 m2/g, at least one active ingredient, or a combination thereof and at least one envelope material, wherein the at least one envelope material releases an active ingredient following activation in the oral chamber, wherein the weight ratio of the envelope material or the sum of the envelope materials to the active ingredient or the sum of the active ingredients is in the range from 10: - 1 to 1;
10,wherein at least one envelope material is selected such that the active ingredient is released in the oral cavity by diffusion, pH change, enzymatic degradation of the envelope material, temperature change, ion exchange or dissolution of the envelope material and wherein, as demonstrated by XPS analysis of the outermost atomic layers of the composite particles, the porous carrier is not completely encapsulated by the envelope material, and at least 10% of the outer surfaces of the composite particles are formed by the porous carrier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- 1 to 1;
Specification