Zero order release and temperature-controlled microcapsules and process for the preparation thereof
Patent 7179407 Issued on February 20, 2007. Estimated Expiration Date: 
February 24, 2023. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 24, 2023. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesProcess for encapsulating particles with a silicone Methods of encapsulating liquids in fatty matrices, and products thereof Method for inducing transformations in waxes Process for making microcapsules and apparatus therefor Apparatus and method for making microcapsules Instant water dissolvable encapsulate and process Patent #: 6541030 InventorsAssigneeApplicationNo. 10373298 filed on 02/24/2003US Classes:264/4.1, Liquid encapsulation utilizing an emulsion or dispersion to form a solid-walled microcapsule (includes liposome)264/4.32, Microcapsule wall containing two or more layers264/4.33, Microcapsule wall derived from synthetic polymer264/4.4, Solid-walled microcapsule formed by cooling molten materials264/7, Coated particles264/9, By vibration or agitation264/12, By impinging or atomizing with gaseous jet or blast264/14, Into moving fluid428/402.24, Microcapsule with solid core (includes liposome)428/403, Coated264/432Microwave (e.g., 2.45 gigahertz, etc.)ExaminersPrimary: Staicovici, StefanAttorney, Agent or FirmForeign Patent References
International ClassesB01J 13/02B32B 15/02 AbstractA microcapsule composition comprising a core material in a matrix of polymorphic shell material, releases said core material in an aqueous environment in accordance with zero order linear release profile. A preferred composition comprises a core material having a degree of water solubility entrapped in a beta crystalline matrix of water insoluble shell material which matrix may, optionally, be surrounded by a contiguous core material-free layer of water insoluble shell material. Also disclosed is a process for the preparation of microcapsules comprising subjecting a flowable mixture of core material and a first amount of water insoluble shell material to a pressure force to form a pressure-treated mixture, and passing said pressure-treated mixture through a spray nozzle into a chilling zone to form a solidified composition. A special embodiment of the method providing for the long term moisture stability of the resulting microcapsules subjects the microcapsules prepared in the first step to a second coating with a second amount of water insoluble shell material.Field of SearchWith treatment subsequent to solid wall formation (e.g., coating, hardening, etc.)Microcapsule wall containing two or more layers Solid-walled microcapsule formed by cooling molten materials Coated particles By extrusion spraying or gravity fall through orifice Liquid encapsulation utilizing an emulsion or dispersion to form a solid-walled microcapsule (includes liposome) Microcapsule wall derived from synthetic polymer By vibration or agitation Into moving fluid Coated Microcapsule with solid core (includes liposome) | |
