MULTI-CAPSULE SYSTEM AND ITS USE FOR ENCAPSULATING ACTIVE AGENTS

• US 20090181254A1
• Filed: 01/15/2008
• Published: 07/16/2009
• Est. Priority Date: 01/15/2008
• Status: Abandoned Application

• Current Assignee: Board of Trustees of The University of Illinois
• Original Assignee: Board of Trustees of The University of Illinois
• Inventors: Mookhoek, Steven, Zwaag, Sybrand van der, Blaiszik, Benjamin J., White, Scott R., Sottos, Nancy R.
• Application Number:
  US12/014,573
• Publication Number:
  US 20090181254A1
• Time in Patent Office: Days
• US Class Current: 428/402.200
• CPC Class Codes: B01J 13/10 Complex coacervation, i.e. interaction of oppositely charged particles
• CPC Class Codes: B01J 13/14 Polymerisation; cross-linking
• CPC Class Codes: B01J 13/20 After-treatment of capsule walls, e.g. hardening
• CPC Class Codes: Y10T 428/2984 Microcapsule with fluid core [includes liposome]

Abstract

A multi-capsule composition includes a first capsule, which includes a first capsule wall defining a first interior volume and a first fluid in the first interior volume, and a plurality of second capsules, at least partially embedded in the first capsule wall. The second capsules include a second capsule wall defining a second interior volume and a second fluid in the second interior volume. The multi-capsule composition may include at least one active agent, such as pharmaceutical agents, food additives, cleaning agents, complexing agents, personal care substances, lubricants, adhesives, heating/cooling agents, colorants, indicators, superabsorbents, agricultural additives, and healing agents.

Claims

1. A multi-capsule composition, comprising:

a first capsule, comprising

a first capsule wall defining a first interior volume, and

a first fluid in the first interior volume;

a plurality of second capsules, at least partially embedded in the first capsule wall;

the second capsules comprising

a second capsule wall defining a second interior volume, and

a second fluid in the second interior volume.

2. The multi-capsule composition of claim 1, where

the first capsule has a diameter of from 5 to 700 micrometers, and

the second capsules have an average diameter of from 10 nanometers to 5 micrometers.

3. The multi-capsule composition of claim 1, where

the first capsule has a diameter of from 30 to 500 micrometers, and

the second capsules have an average diameter of from 10 nanometers to 2.5 micrometers.

4. The multi-capsule composition of claim 1, where the first capsule has a diameter that is at least one order of magnitude greater than an average diameter of the second capsules.

5. The multi-capsule composition of claim 1, where the first capsule has a diameter that is at least two orders of magnitude greater than an average diameter of the second capsules.

6. The multi-capsule composition of claim 1, where at least a portion of the second capsules are in contact with the first interior volume.

7. The multi-capsule composition of claim 1, where at least a portion of the second capsules are in contact with the exterior of the first capsule wall.

8. The multi-capsule composition of claim 1, further comprising an additional plurality of second capsules, which are not at least partially embedded in the first capsule wall.

9. The multi-capsule composition of claim 1, where at least one of the first fluid and the second fluid comprises an active agent selected from the group consisting of a pharmaceutical agent, a food additive, a cleaning agent, a complexing agent, a personal care substance, a lubricant, an adhesive, a heating/cooling agent, a colorant, an indicator, a superabsorbent, an agricultural additive and a healing agent.

10. The multi-capsule composition of claim 1, where at least one of the first fluid and the second fluid comprises a healing agent.

11. The multi-capsule composition of claim 10, where one of the first fluid and the second fluid comprises a polymerizer, and the other of the first fluid and the second fluid comprises an activator for the polymerizer.

12. The multi-capsule composition of claim 1, further comprising at least one additional plurality of capsules.

13. The multi-capsule composition of claim 1, further comprising a plurality of third capsules, in contact with at least a portion of the plurality of second capsules;

the third capsules comprising a third capsule wall defining a third interior volume, and a third fluid in the third interior volume.

14. The multi-capsule composition of claim 13, where

the first capsule has a diameter of from 5 to 700 micrometers,

the second capsules have an average diameter of from 10 nanometers to 5 micrometers, and

the third capsules have an average diameter of from 10 nanometers to 5 micrometers.

15. The multi-capsule composition of claim 14, where the diameter of the first capsule is at least one order of magnitude greater than the average diameter of the second capsules and the average diameter of the third capsules.

16. The multi-capsule composition of claim 13, where at least one of the first fluid, the second fluid and the third fluid comprises an active agent selected from the group consisting of a pharmaceutical agent, a food additive, a cleaning agent, a complexing agent, a personal care substance, a lubricant, an adhesive, a heating/cooling agent, a colorant, an indicator, a superabsorbent, an agricultural additive and a healing agent.

28. A composite material, comprising:

a polymer matrix, and

the multi-capsule composition of claim 1.

31. A method of making the composite material of claim 28, comprising:

combining the multi-capsule composition with a matrix precursor, and

solidifying the matrix precursor to form the polymer matrix.

36. An article, comprising the composite material of claim 28.

17. A method of making a multi-capsule composition, comprising:

forming an emulsion, comprising

a first fluid,

a plurality of second capsules, comprising a second capsule wall defining a second interior volume and a second fluid in the second interior volume, and

a continuous fluid, immiscible with the first fluid;

where at least a portion of the second capsules are at an interface between the first fluid and the continuous fluid; and

forming a first capsule wall at the interface, where the first capsule wall defines an interior volume comprising at least a portion of the first fluid.

18-27. -27. (canceled)

29-30. -30. (canceled)

32-35. -35. (canceled)

37. (canceled)