Abstract: A process of preparation of microcapsules having a shell and a core that includes a waxy solid, includes (a) dispersing particles of waxy solid material in a water-immiscible liquid in which the waxy solid material is insoluble; (b) emulsifying the resulting dispersion into an aqueous solution of a capsule wall-forming material to form an emulsion of droplets; (c) forming a coating of the capsule wall-forming material on the emulsified droplets containing the dispersed waxy solid particles to provide capsules; (d) heating the capsules to a temperature above the melting point of the waxy solid material; and (e) cooling the capsules to a temperature below the melting point of the waxy solid material.

Abstract: A method of making core-shell capsules containing a water-immiscible liquid, comprising the steps of (a) dispersing into the water-immiscible liquid a crosslinking agent that is inactive under the conditions of the dispersion; (b) emulsifying the resulting dispersion into an aqueous solution of a crosslinkable hydrocolloid; and (c) activating the crosslinking agent to cause the hydrocolloid to crosslink at the dispersion/solution interface. The method is simple and provides capsules that can be cold-loaded.

Abstract: A process of preparation of microcapsules having a shell and a core that includes a waxy solid, includes (a) dispersing particles of waxy solid material in a water-immiscible liquid in which the waxy solid material is insoluble; (b) emulsifying the resulting dispersion into an aqueous solution of a capsule wall-forming material to form an emulsion of droplets; (c) forming a coating of the capsule wall-forming material on the emulsified droplets containing the dispersed waxy solid particles to provide capsules; (d) heating the capsules to a temperature above the melting point of the waxy solid material; and (e) cooling the capsules to a temperature below the melting point of the waxy solid material.

Abstract: A critical temperature indicator according to the present invention produces a visual, irreversible indication that the indicator has been subjected to a selected critical temperature. The critical temperature indicator includes a transparent housing, and a temperature sensitive transformable material operably contained within the transparent housing which includes mixture of water, nucleating agent (preferably ice nucleating active (INA) microorganisms), latex, and stabilizer which is translucent prior to exposure of a predetermined temperature and is transformed upon being subjected to the predetermined temperature to render a substantially consistent opaque material thus precluding visibility therethrough and thereby providing a sure visual sign that the indicator has been subjected to the predetermined temperature.