Flowable core-shell microencapsule composition
A method for producing a flowable active material-encapsulated core-shell microcapsule composition by mechanically removing solvent from a microcapsule suspension to produce a wet cake, and subsequently charging the wet cake with a dry flow aid, is provided.
1. A method for producing a flowable core-shell microcapsule composition comprising:
(a) removing, from a suspension composed of a solvent and core-shell microcapsules each encapsulating an active material, a substantial portion of the solvent by candle filtration to produce a wet cake; and
(b) charging the wet cake with a compound selected from the group consisting of sodium silicate, potassium silicate, and monoammonium phosphate as a dry flow aid and flame retardant thereby producing a flowable core-shell microcapsule composition, wherein the flowable core-shell microcapsule composition has a minimum ignition energy of greater than 10 mJ.
2. A flowable core-shell microcapsule composition produced by the method of claim 1 .
3. A consumer product comprising the flowable core-shell microcapsule composition of claim 2 .
4. The method of claim 1 , wherein the water content of the flowable core-shell microcapsule composition is in the range of 0% to 60% by weight.
5. The method of claim 1 , wherein the flowable core-shell microcapsule composition has a Hausner ratio in the range of 1 to 1.25.
6. A method for producing a flowable core-shell microcapsule composition comprising:
(a) removing, from a suspension composed of a solvent and core-shell microcapsules each encapsulating an active material, a substantial portion of the solvent by mechanical separation to produce a wet cake; and
(b) charging the wet cake with a compound selected from the group consisting of sodium silicate, potassium silicate, and monoammonium phosphate as a dry flow aid and flame retardant thereby producing a flowable core-shell microcapsule composition, wherein the flowable core-shell microcapsule composition has a minimum ignition energy of greater than 10 mJ.
7. The method of claim 6 , wherein the water content of the flowable core-shell microcapsule composition is in the range of 0% to 60% by weight.
8. The method of claim 6 , wherein the flowable core-shell microcapsule composition has a Hausner ratio in the range of 1 to 1.25.
9. A flowable core-shell microcapsule composition produced by the method of claim 6 .
10. A consumer product comprising the flowable core-shell microcapsule composition of claim 9 .