Encapsulation compositions

Patent metadata

Field	Value
Publication number	US-11375714-B2
Application number	US-201716091610-A
Country	US
Kind code	B2
Filing date	Apr 8, 2017
Priority date	Apr 8, 2016
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

An encapsulation composition is described. The composition comprises a plurality of capsules, each capsule comprising an amphiphilic material encapsulating a pyrethroid. The encapsulated pyrethroid has a release rate less than the release rate of the unencapsulated pyrethroid. Coated fabric products are also described.

First claim

The invention claimed is:

1. An encapsulated composition comprising:
a plurality of capsules each comprising an amphiphilic material encapsulating a pyrethroid, the amphiphilic material forming micelles around the pyrethroid, wherein the amphiphilic material has hydrophilic and hydrophobic portions, and wherein the hydrophilic portion anchors the encapsulated pyrethroid and the hydrophobic portion forms a shell wall of the capsule, the encapsulated pyrethroid having a release rate less than a release rate of unencapsulated pyrethroid;
wherein the capsules have a particle size of about 0.8 μm to about 10 μm.

2. The composition of claim 1 wherein the pyrethroid is at least one of allethrin, permethrin, transfluthrin, tefluthrin, metofluthrin, fenfluthrin, kadethrin, neopynamins, prallethrin, vapothrin, esbiothrin, dichlovos, deltamethrin, and cypermethlin.

3. The composition of claim 1 wherein the amphiphilic material is a polymer.

4. The composition of claim 3 wherein the polymer is a copolymer.

5. The composition of claim 1 wherein the amphiphilic material is a graft copolymer, a modified N,N,N′,N′-Tetrakis(2-hydroxypropyl)ethylenediamine, a cationic nanoparticle, a diblock copolymer, a triblock copolymer, an ionic surfactant, a nonionic surfactant, a low surface energy silica, a Guerbet ester, or a poly(stearyl methacrylate-co-acrylic acid).

6. The composition of claim 1 wherein the amphiphilic material has a hydrophilic-lipophilic balance within a range of from about 1 to about 20.

7. The composition of claim 1 wherein the capsules are stable at alkaline pH.

8. The composition of claim 1 wherein the amphiphilic material is at least one of a diblock copolymer, a triblock copolymer, and a nonionic surfactant.

9. The composition of claim 1 wherein the amphiphilic material is an amphiphilic polymer.

10. The composition of claim 8 wherein the amphiphilic material has a critical micelle concentration within a range of from about 0.0001 wt % to about 50 wt % and wherein the capsules have a particle size of about 0.9 μm to about 8 μm.

11. The composition of claim 1 wherein the pyrethroid is transfluthrin.

12. The composition of claim 1 wherein the amphiphilic material is a poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer.

13. The composition of claim 1 , wherein the pyrethroid is at least one of allethrin, permethrin, transfluthrin, tefluthrin, metofluthrin, fenfluthrin, kadethrin, neopynamins, prallethrin, vapothrin, esbiothrin, dichlovos, deltamethrin, and cypermethrin.

14. A product comprising:
the composition of claim 1 coated on a fabric.

15. The product of claim 14 further comprising one or more additional ingredients useful for formulating the product wherein the pyrethroid is transfluthrin encapsulated in a PEO-PPO-PEO block coploymer.

16. An encapsulated composition coated on a fabric comprising:
a plurality of capsules having a particle size of about 0.8 μm to about 10 μm each comprising an amphiphilic material encapsulating a pyrethroid, the amphiphilic material forming micelles around the pyrethroid, wherein the amphiphilic material has hydrophilic and hydrophobic portions, and wherein the hydrophilic portion anchors the encapsulated pyrethroid and the hydrophobic portion forms a shell wall of the capsule, and wherein the amphiphilic material is a graft copolymer, a modified N,N,N′,N′-Tetrakis(2-hydroxypropyl)ethylenediamine, a cationic nanoparticle, a diblock copolymer, a triblock copolymer, an ionic surfactant, a nonionic surfactant, a low surface energy silica, a Guerbet ester, or a poly(steatyl methacrylate-co-acrylic acid),
wherein the composition is coated on a fabric wherein the fabric is derived from polymeric fibers or natural material;
wherein the encapsulated pyrethroid having a release rate less than a release rate of unencapsulated pyrethroid and wherein the release rate of the encapsulated pyrethroid is such that, when the pyrethroid is coated on 1 square inch of the fabric and kept at 70° F. and 68% relative humidity, the release rate of pyrethroid is less than or equal to 6 mg/day;
wherein the amphiphilic material has a hydrophilic-lipophilic balance within a range of from about 1 to about 20.

17. The encapsulated composition coated on a fabric of claim 16 wherein the amphiphilic material has a critical micelle concentration within a range of from about 0.0001 wt % to about 50 wt % and wherein the amphiphilic material has a hydrophilic-lipophilic balance within a range of from about 1 to about 20.

18. The encapsulated composition coated on a fabric of claim 16 wherein the pyrethroid is transfluthrin and wherein the amphiphilic material is a poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer.

19. The encapsulated composition coated on a fabric of claim 16 wherein the amphiphilic material is a graft copolymer, a modified N,N,N′,N′-Tetrakis(2-hydroxypropyl)ethylenediamine, a cationic nanoparticle, a diblock copolymer, a triblock copolymer, an ionic surfactant, a nonionic surfactant, a low surface energy silica, a Guerbet ester, or a poly(steatyl methacrylate-co-acrylic acid).

20. The encapsulated composition coated on a fabric of claim 16 wherein the pyrethroid is transfluthrin encapsulated in a PEO-PPO-PEO block.

Assignees

• Battelle Memorial Institute

Inventors

• Lalgudi Ramanathan S
• Shqau Krenar

Classifications

• A01N53/00

  Biocides, pest repellants or attractants, or plant growth regulators containing cyclopropane carboxylic acids or derivatives thereof · CPC title

• C11D17/0039

  Coated compositions or coated components in the compositions, (micro)capsules · CPC title

• C11D3/3935

  granulated, coated or protected · CPC title

• A01N25/04

  Dispersions, {emulsions, suspoemulsions, suspension concentrates} or gels (foams A01N25/16) · CPC title

• D06M23/12

  Processes in which the treating agent is incorporated in microcapsules (making microcapsules B01J13/02) · CPC title