Coated granules produced by in-situ crosslinking process
AssigneeDanisco US Inc.
InventorsNathaniel T Becker, Douglas A Dale, Ryan M Kawakita, Herbert B Scher, Scott A Strobel, Tina Jeoh Zicari
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Abstract
Described are compositions and methods relating to a coated granule comprising a core coated with cross-linkable polymer, where the cross-linkable polymer is applied using a feed suspension that includes an acid-neutralized volatile base and a calcium salt insoluble at the pH of the neutralized feed suspension. Volatilization of the base decreases the pH of the feed suspension, thereby solubilizing the calcium salt, and inducing in situ ion-mediated cross-linking of the cross-linkable polymer.
Claims25
A method for applying cross-linked coatings comprising a benefit agent onto granular core material, comprising:
- providing a feed suspension comprising a cross-linkable polymer, an acid neutralized with a volatile base, and a calcium salt insoluble at the pH of the neutralized feed suspension;
- and
- atomizing the feed suspension in a fluidized-bed spray-coater operated in Wurster mode so as to contact, deposit and coat the atomized feed suspension onto the granular core material;
- wherein upon atomization and contacting of the feed suspension with the cores, volatilization of the volatile base lowers the pH of the feed suspension, solubilizing the calcium salt and enabling ion-mediated cross-linking of the cross-linkable polymer to form a cross-linked coating layer on the granular core material.
Dependencies are inferred from the claim text.