Controlled release active agent carrier
AssigneeOmya International AG
InventorsPatrick A.C. Gane, Joachim Schoelkopf
Life of this patent
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Abstract
The present invention relates to carriers for the controlled release of active agents, comprising surface reacted natural or synthetic calcium carbonate, one or more active agents, wherein said one or more active agent is associated with said surface-reacted calcium carbonate, and wherein said surface-reacted natural or synthetic calcium carbonate is a reaction product of natural or synthetic calcium carbonate with carbon dioxide and one or more acids, wherein the carbon dioxide is formed in situ by the acid treatment and/or is supplied from an external source. It further relates to the preparation of loaded carriers, as well as their use in different applications.
Claims30
A method for introducing one or more active agents to a target environment comprising contacting the target environment with a controlled release formulation comprising the one or more active agents so that the controlled release formulation releases a sufficient quantity of the one or more active agents at the target environment, wherein the controlled release formulation comprises (i) a surface reacted calcium carbonate that is a reaction product of calcium carbonate with carbon dioxide and one or more acids, wherein the carbon dioxide is formed in situ by the acid treatment and/or is supplied from an external source, and (ii) a controlled quantity of the one or more active agents adsorbed onto and/or absorbed into the surface-reacted calcium carbonate.
Dependencies are inferred from the claim text.