Compositions containing microcapsules coated with deposition proteins
A microcapsule composition containing microcapsules coated with a deposition protein, e.g., a protein-silanol copolymer, a protein-silane copolymer, a protein-siloxane copolymer, or a cationically modified protein, is provided as is a method for making the microcapsule composition and using the microcapsule composition in consumer products, in particular rinse-off consumer product.
1. A method for preparing a microcapsule composition comprising:
(a) providing a microcapsule slurry having a plurality of microcapsules each containing a polymeric wall and an active material encapsulated within the polymeric wall;
(b) curing the microcapsules; and
(c) coating each of the microcapsules with a deposition protein,
wherein the deposition protein is cross-linked on the surface of the microcapsules (i) at a temperature between 35 to 75° C. after curing the microcapsules or (ii) by adding an alkoxysilane after step (b); and the active material contains a fragrance, pro-fragrance, flavor, malodor counteractive agent, anti-inflammatory agent, anesthetic, analgesic, anti-viral agent, anti-infectious agent, anti-acne agent, skin lightening agent, insect repellant, emollient, skin moisturizing agent, vitamin or derivative thereof, or any combination thereof.
2. The method of claim 1 , wherein the microcapsules are coated with the deposition protein at a temperature between 35 to 75° C.
3. The method of claim 1 , further comprising step (d) adding a second deposition aid after step (b).
4. The method of claim 1 , wherein the deposition protein is a cationically modified protein.
5. The method of claim 4 , wherein the cationically modified protein is a protein-acrylate copolymer having a nitrogen-containing acrylic moiety.
6. The method of claim 5 , wherein the nitrogen-containing acrylic moiety comprises a tertiary or quaternary amine group.
7. The method of claim 1 , wherein the deposition protein is cross-linked on the surface of the microcapsules using the alkoxysilane.
8. The method of claim 1 , wherein the plurality of microcapsules are prepared by cross-linking a polyisocyanate with an activation agent selected from the group consisting of an amine cross-linker, an alcohol cross-linker, an epoxy cross-linker, an acrylate cross-linker, a hybrid cross-linker, and a combination thereof.
9. The method of claim 1 , wherein the deposition protein is a modified vegetable protein, wheat protein, marine collagen protein, keratin protein, silk protein, or milk protein.
10. The method of claim 1 , wherein the deposition protein has a molecular weight in the range of 1000 to 500,000.
11. The method of claim 1 , wherein the microcapsule composition comprising a second deposition aid selected from the group consisting of anionically, cationically, nonionically, or amphoteric water-soluble polymers.
12. A microcapsule composition prepared by the method of claim 1 .
13. A consumer product comprising the microcapsule composition of claim 12 .
14. The consumer product of claim 13 , further comprising one or more different microcapsules, free active material, or a combination thereof.
15. The consumer product of claim 13 , wherein the consumer product is a shampoo, hair conditioner, body wash, detergent, softener, bar soap, scent booster, or hard surface cleaner.