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US 2011/0236444 A1Published application
Antimicrobial Silica Composites
OwnerMichael S. Darsillo, Fitzgerald Sinclairinventors
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Abstract
The composites disclosed herein comprise silica and an antimicrobial metal oxide. The composites are useful in inhibiting microbial growth and are therefore useful in a variety of applications, including, for example, as components in dentifrice compositions.
Claims20
An antimicrobial silica composite comprising silica and a metal oxide of silver, zinc, copper, or a mixture thereof;
- wherein the composite is prepared from silica particles having a median particle size of from 1 to 100 microns and metal oxide particles having a median particle size that is up to 30% of the median particle size of the silica particles.
A dentifrice composition comprising an antimicrobial silica composite, the composite comprising silica and a metal oxide of silver, zinc, copper, or a mixture thereof;
- wherein the composite is prepared from silica particles having a median particle size of from 1 to 100 microns and metal oxide particles having a median particle size that is up to 30% of the median particle size of the silica particles;
- and at least one other dentifrice component.
A method for preparing an antimicrobial silica composite, comprising:
- a) mixing a metal oxide of silver, zinc, copper, or a mixture thereof, with an aqueous slurry comprising from 1% to 10% by weight silica, to provide an aqueous silica/metal oxide slurry comprising from 0.01% to 1% by weight of the metal oxide;
- wherein the aqueous slurry is at a constant acidic pH prior to mixing;
- b) readjusting the pH of the aqueous silica/metal oxide slurry to a constant acidic pH;
- and
- c) drying the aqueous silica/metal oxide slurry to provide the antimicrobial silica composite.
2 more elements
Dependencies are inferred from the claim text.