Compositions containing cationically surface-modified microparticulate carrier for benefit agents

• US 7,977,288 B2
• Filed: 03/03/2009
• Issued: 07/12/2011
• Est. Priority Date: 01/12/2005
• Status: Expired due to Fees

• Current Assignee: Amcol International Corporation (Minerals Technologies Incorporated)
• Original Assignee: Amcol International Corporation (Minerals Technologies Incorporated)
• Inventors: SenGupta, Ashoke K.
• Primary Examiner(s): Boyer; Charles I
• Application Number:
  US12/397,043
• Publication Number:
  US 20090162408A1
• Time in Patent Office: 861 Days
• Field of Search: 510/119, 510/122, 510/130, 510/135, 510/136, 510/466
• US Class Current: 510/122
• CPC Class Codes: A61K 2800/412 Microsized, i.e. having sizes between 0.1 and 100 microns
• CPC Class Codes: A61K 2800/5426 cationic
• CPC Class Codes: A61K 8/11 Encapsulated compositions
• CPC Class Codes: A61K 8/731 Cellulose; Quaternized cellulose derivatives
• CPC Class Codes: A61Q 19/10 Washing or bathing preparations
• CPC Class Codes: A61Q 5/02 Preparations for cleaning the hair
• CPC Class Codes: A61Q 5/12 Preparations containing hair conditioners
• CPC Class Codes: C11D 17/0039 Coated compositions or coated components in the compositions, (micro)capsules
• CPC Class Codes: C11D 3/505 encapsulated or adsorbed on a carrier, e.g. zeolite or clay

Abstract

A coated microparticulate composition comprising a microparticulate; wherein the microparticulate comprises a benefit agent; and wherein the microparticulate is coated with: a Type-1 Polymer, wherein the Type-1 Polymer comprises a cationic polymer with a cationic atom content greater than about 3 wt. % and a weight average molecular weight less than about 800,000 Dalton; and a Type-2 Polymer, wherein the Type-2 Polymer comprises a cationic polymer with a cationic atom content less than about 3 wt. % and a weight average molecular weight greater than about 1,000,000 Dalton.

Claims

1. A coated microparticulate composition comprising a microparticulate having a particle size in the range of about 1 μ

m to about 500 μ

m, a Type-1 Polymer, and a Type-2 Polymer;

wherein the microparticulate comprises a benefit agent comprising about 35 wt. % to about 99.5 wt. % of the coated microparticulate; and

wherein the microparticulate is coated;

first with the Type-1 Polymer, wherein the Type-1 Polymer comprises a cationic polymer with a cationic atom content of about 3 wt. % to about 20 wt. % and a weight average molecular weight of about 300,000 to about 800,000 Dalton; and

then with the Type-2 Polymer, wherein the Type-2 Polymer comprises a cationic polymer with a cationic atom content of about 0.1 wt. % to about 3 wt. % and a weight average molecular weight greater than about 1,000,000 Dalton;

wherein the weight ratio of the Type-1 Polymer to Type-2 Polymer is in the range of 3 to 7.

2. The coated microparticulate composition of claim 1, wherein the cationic atom content in both the Type-1 Polymer and the Type-2 Polymer comprise quaternary ammonium ions.

3. The coated microparticulate composition of claim 1 wherein the microparticulate is combined with an additive selected from the group consisting of water, an organic solvent, a surfactant, and a mixture thereof to form the microparticulate composition.

4. The coated microparticulate composition of claim 1, wherein the microparticulate has an average particle diameter of about 3 to about 100 microns.

5. The coated microparticulate composition of claim 4, wherein the microparticulate has an average particle diameter of about 6 to about 50 microns.

6. The coated microparticulate composition of claim 4, wherein the microparticulate has a diameter of about 8 to about 10 microns.

7. The coated microparticulate composition of claim 1, wherein the microparticulate is carried by a particulate carrier.

8. The coated microparticulate composition of claim 7, wherein the particulate carrier is selected from the group consisting of an adsorbent polymeric microparticle, an adsorbent polymer, a porous solid state material, a porous polymeric material, an encapsulating shell, and a mixture thereof.

9. The coated microparticulate composition of claim 1, wherein the benefit agent is selected from the group consisting of a flavor, a fragrance, an insect repellent, a silicone oil, a fabric softening agent, an anti-static agent, an anti-wrinkle agent, a stain-resistant agent, an emollient, a moisturizing agent, a wax, an ultraviolet (UV) ray absorber, an antimicrobial agent, an antioxidant, a pigment, a film-forming agent, a skin-care agent, a hair-care agent, a scalp-care agent, an anti-dandruff agent, a hair-coloring agent, a hair-conditioning agent, and a mixture thereof.

10. The coated microparticulate composition of claim 1, wherein the Type-1 Polymer has a weight average molecular weight of about 350,000 to about 600,000 Dalton.

11. The coated microparticulate composition of claim 10, wherein the Type-1 Polymer has a weight average molecular weight of about 400,000 to about 550,000 Dalton.

12. The coated microparticulate composition of claim 1, wherein the Type-1 Polymer has a cationic atom content in the range of about 5 wt. % to about 15 wt. %.

13. The coated microparticulate composition of claim 12, wherein the Type-1 Polymer has a cationic atom content of about 8 wt. % to about 10 wt. %.

14. The coated microparticulate composition of claim 1, wherein the Type-2 Polymer has a weight average molecular weight of about 1,000,000 to about 15,000,000 Dalton.

15. The coated microparticulate composition of claim 14, wherein the Type-2 Polymer has a weight average molecular weight of about 1,000,000 to about 10,000,000 Dalton.

16. The coated microparticulate composition of claim 15, wherein the Type-2 Polymer has a weight average molecular weight of about 1,000,000 to about 5,000,000 Dalton.

17. The coated microparticulate composition of claim 1, wherein the Type-2 Polymer has a cationic atom content in the range of about 0.1 wt. % to about 2 wt. %.

18. The coated microparticulate composition of claim 17, wherein the Type-2 Polymer has a cationic atom content in the range of about 0.5 wt. % to about 1 wt. %.

19. The composition of claim 1, wherein the coated microparticulate composition consists essentially of the microparticulate, a Type-1 Polymer, and a Type-2 Polymer.

20. The coated microparticulate composition of claim 1, wherein the microparticulate comprises about 50 wt. % to about 99.0 wt. % of the coated microparticulate composition.

21. The coated microparticulate composition of claim 20, wherein the microparticulate comprises about 65 wt. % to about 95.0 wt. % of the coated microparticulate composition.

22. A product selected from the group consisting of a shampoo, a conditioner, a body wash, a moisturizing agent, a cosmetic cream, a shower gel, a soap, a detergent, a toothpaste, a surface cleansing agent, a surface conditioning agent, and a mixture thereof, wherein the product comprises the coated microparticulate composition of claim 1.

23. A method of making a coated microparticulate composition consisting essentially of a microparticulate coated with a Type-1 Polymer and a Type-2 Polymer, wherein the microparticulate comprises a benefit agent comprising about 35 wt. % to about 99.5 wt. % of the coated microparticulate comprising:

admixing a sufficient amount of a Type-1 Polymer with a microparticulate to raise a ζ

-potential of an aqueous dispersion of the admixed Type-1 Polymer and microparticulate to at least 65 mV when measured at a concentration of about 0.1 wt. % microparticulate in water;

and admixing a Type-2 Polymer with the microparticulate, wherein the Type-1 Polymer has a cationic nitrogen content of at least about 3 wt. % and a weight average molecular weight of less than about 800,000 Dalton, wherein the Type-2 Polymer has a cationic nitrogen content of less than about 3 wt. % and a weight average molecular weight of greater than about 1,000,000 Dalton; and

wherein the weight ratio of the Type-1 Polymer to Type-2 Polymer is in the range of 3 to 7.

24. The method of claim 23, wherein a ratio of the combined weight of the Type-1 Polymer and the Type-2 Polymer to the weight of the microparticulate is in the range of about 0.01 to about 10.

25. The method of claim 23, wherein the microparticulate is selected from the group consisting of a benefit agent, a particulate carrier, and a mixture thereof.

26. The method of claim 23, wherein the method comprises admixing the Type-1 Polymer with the microparticulate to form a Type-1 Polymer-coated microparticulate, and then admixing the Type-2 Polymer with the Type-1 Polymer coated microparticulate.

27. The method of claim 23, wherein the method comprises admixing the Type-1 Polymer with the Type-2 Polymer to make a polymer composition and then admixing the polymer composition with the microparticulate to form the coated microparticulate.

28. The method of claim 23, wherein the microparticulate prior to admixing with either the Type-1 Polymer or the Type-2 Polymer has a neutral or cationic surface charge, and further comprising admixing a sufficient amount of an anionic treatment agent selected from the group consisting of an anionic surfactant, an anionic polymer, and a mixture thereof, with the microparticulate to change the ζ

-potential of an aqueous dispersion of the admixed anionic treatment agent and microparticulate to at least −

50 mV when measured at a concentration of about 0.1 wt. % microparticulate in water.

29. A microparticulate coating composition consisting essentially of a polymer mixture, wherein the polymer mixture consists of a Type-1 Polymer and a Type-2 Polymer, and wherein the polymer mixture comprises about 50 wt. to about 99 wt. % of the Type-1 Polymer and about 1 wt. % to about 50 wt. % of the Type-2 Polymer, based on the total weight of the polymers in the mixture, wherein the Type-1 Polymer has a cationic nitrogen content of at least about 3 wt. % and a weight average molecular weight of less than about 800,000 Dalton, wherein the Type-2 Polymer has a cationic nitrogen content of less than about 3 wt. % and a weight average molecular weight of greater than about 1,000,000 Dalton;

and wherein the weight ratio of the Type-1 Polymer to Type-2 Polymer is in the range of 3 to 7.

30. The microparticulate coating composition of claim 29, wherein the polymer mixture comprises about 60 wt. % to about 95 wt. % of the Type-1 Polymer and about 5 wt. % to about 40 wt. % of the Type-2 Polymer, based on the total weight of the polymers in the mixture.

31. The microparticulate coating composition of claim 30, wherein the polymer mixture comprises about 70 wt. % to about 90 wt. % of the Type-1 Polymer and about 10 wt. % to about 30 wt. % of the Type-2 Polymer.

32. The microparticulate coating composition of claim 30, wherein the Type-1 Polymer is a poly(DADMAC) and wherein the Type-2 Polymer is selected from the group consisting of a cationically modified guar, a cationically modified cellulose, and a mixture thereof.

33. A method of applying a benefit agent to a substrate comprising contacting the substrate with a coated microparticulate consisting essentially of a microparticulate coated with a Type-1 Polymer and a Type-2 Polymer, wherein the microparticulate comprises a benefit agent comprising about 35 wt. % to about 99.5 wt. % of the coated microparticulate, and

rinsing the substrate with water;

wherein the coated microparticulate comprises a benefit agent or a carrier containing the benefit agent coated with the Type-1 Polymer and the Type-2 Polymer at a weight ratio of the Type-1 Polymer to Type-2 Polymer in the range of 3 to 7, wherein the Type-1 Polymer has a cationic nitrogen content of at least about 3 wt. % and has a weight average molecular weight of less than about 800,000 Dalton, and the Type-2 Polymer has a cationic nitrogen content in a range of about 0.1 wt. % to about 3 wt. % and having a weight average molecular weight of at least about 1,000,000 Dalton, and wherein the coated microparticulate has an increased deposition and an increased retention on the substrate as compared to a coated microparticulate having the same weight percentage microparticulate selected from the group consisting of a first microparticulate consisting essentially of a microparticulate coated with only a Type-1 Polymer;

a second microparticulate consisting essentially of a microparticulate coated with only a Type-2 Polymer.

34. The method of claim 33, wherein the coated microparticulate about 5 wt. % to about 20 wt. % of the Type-1 Polymer based on the total weight of the coated microparticulate, and about 0.1 wt. % to about 5 wt. % of the Type-2 Polymer based on the total weight of the coated microparticulate.