Cleaning articles treated with a high internal phase inverse emulsion

• US 5,980,922 A
• Filed: 12/05/1996
• Issued: 11/09/1999
• Est. Priority Date: 04/30/1996
• Status: Expired due to Term

• Current Assignee: The Procter & Gamble Company
• Original Assignee: The Procter & Gamble Company
• Inventors: Mackey, Larry Neil, Hird, Bryn, Trokhan, Paul Dennis
• Primary Examiner(s): Dees, Jose' G.
• Assistant Examiner(s): Shelborne, Kathryne E.
• Application Number:
  US08/759,547
• Time in Patent Office: 1,069 Days
• Field of Search: 424/402, 424/443, 424/404
• US Class Current: 424/402
• CPC Class Codes: A61K 8/0208 Tissues; Wipes; Patches
• CPC Class Codes: A61K 8/06 Emulsions
• CPC Class Codes: A61Q 19/10 Washing or bathing preparations

Abstract

The invention relates to articles useful in cleansing, and particularly to wet-like cleansing wipes that are especially useful for hard surface cleaning, and in personal cleansing such as baby wipes and particularly for removal of perianal soils. These articles comprise: a carrier; and an emulsion applied to the carrier. The emulsion comprises (1) from about 2 to about 60% of a continuous solidified lipid phase comprising a waxy lipid material having a melting point of about 30° C. or higher, (2) from about 39 to about 97% of an internal polar (e.g., water) phase dispersed in the lipid phase; (3) an effective amount of a non-silicon containing emulsifier, where the emulsifier has a viscosity at 55° C. of greater than about 500 centipoise; and (4) and an optional second emulsifier having a viscosity at 55° C. of less than about 400 centipoise. Because the emulsion comprises a waxy external phase, the internal polar phase is retained in the emulsion until in-use shear pressures break the emulsion, thereby providing desired moisture for cleaning. The invention also relates to a process for making the cleaning articles.

Claims

1. An article, which comprises:

a. a carrier; and

b. a lipid continuous emulsion applied to the carrier, the emulsion comprising;

(1) from about 2 to about 60% of a continuous solidified external lipid phase comprising a waxy lipid material having a melting point of about 30°

C. or higher;

(2) from about 39 to about 97% of an internal polar phase dispersed in the external lipid phase; and

(3) an effective amount of a non-silicon containing emulsifier capable of forming the emulsion when the external lipid phase is in a fluid state;

the emulsifier having a viscosity at 55°

C. of at least about 500 centipoise.

2. The article of claim 1 wherein the internal polar phase comprises at least about 60%, by weight of the internal polar phase, of water.

3. The article of claim 2 wherein the internal polar phase comprises at least about 75%, by weight of the internal polar phase, of water.

4. The article of claim 3 wherein the internal polar phase comprises at least about 85%, by weight of the internal polar phase, of water.

5. The article of claim 1 wherein the emulsifier has a viscosity at 55°

C. of at least about 1,500 centipoise.

6. The article of claim 5 wherein the emulsifier has a viscosity at 55°

C. of at least about 5,000 centipoise.

7. The article of claim 6 wherein the emulsifier has a viscosity at 55°

C. of at least about 10,000 centipoise.

8. The article of claim 5 wherein the emulsifier has an HLB of not more than about 5.

9. The article of claim 1 wherein the carrier comprises as a substrate layer a material selected from the group consisting of woven materials, nonwoven materials, foams, sponges, battings, balls, puffs, and films.

10. The article of claim 9 wherein the substrate layer is a paper web.

11. The article of claim 1 wherein the emulsion comprises from about 5 to about 30% of the external lipid phase and from about 67 to about 92% of the internal polar phase.

12. The article of claim 1 wherein the waxy lipid material has a melting point in the range of from about 40°

to about 80°

C.

13. The article of claim 1 wherein the waxy lipid material is selected from the group consisting of animal waxes, vegetable waxes, mineral waxes, synthetic waxes and mixtures thereof.

14. The article of claim 13 wherein the waxy lipid material is selected from the group consisting of beeswax, lanolin, candelilla, petrolatum, microcrystalline wax, yellow ceresine wax, white ozokerite, polyethylene waxes, and mixtures thereof.

15. The article of claim 1 wherein the carrier comprises two paper web plies having opposed inner surfaces and wherein the emulsion is applied to at least one of the opposed inner surfaces.

16. An article, which comprises:

a. a carrier; and

b. a lipid continuous emulsion applied to the carrier, the emulsion comprising;

(1) from about 2 to about 60% of a continuous solidified external lipid phase comprising a waxy lipid material having a melting point of about 30°

C. or higher;

(2) from about 39 to about 97% of an internal polar phase dispersed in the external lipid phase; and

(3) an effective amount of a non-silicon containing emulsifier capable of forming the emulsion when the external lipid phase is in a fluid state;

wherein the emulsifier is a hydrocarbyl-substituted carboxylic acid or anhydride, or a salt, ester or amide thereof.

17. The article of claim 16 wherein the internal polar phase comprises at least about 60%, by weight of the internal polar phase, of water.

18. The article of claim 17 wherein the internal polar phase comprises at least about 75%, by weight of the internal polar phase, of water.

19. The article of claim 16 wherein the internal polar phase comprises at least about 85%, by weight of the internal polar phase, of water.

20. The article of claim 16, wherein the emulsifier is the reaction product of (i) a polyisobutylene-substituted carboxylic acid or anhydride, or a salt thereof;

and (ii) an amine or an alcohol.

21. The article of claim 20, wherein the emulsifier is the reaction product of (i) a polyisobutylene-substituted succinic acid or succinic anhydride, or a salt thereof;

and (ii) an amine or an alcohol.

22. The article of claim 16 wherein the emulsion comprises as a second emulsifier a block copolymer comprising poly-12-hydroxystearic acid and polyethylene oxide monomer units.

23. The article of claim 16, wherein the emulsion comprises as a second emulsifier an organopolysiloxane-polyoxyalkylene copolymer.

24. The article of claim 16 wherein the carrier comprises as a substrate layer a material selected from the group consisting of woven materials, nonwoven materials, foams, sponges, battings, balls, puffs, and films.

25. The article of claim 24 wherein the substrate layer is a paper web.

26. The article of claim 16 wherein the emulsion comprises from about 5 to about 30% of the external lipid phase and from about 67 to about 92% of the internal polar phase.

27. The article of claim 16 wherein the waxy lipid material has a melting point in the range of from about 40°

to about 80°

C.

28. The article of claim 16 wherein the waxy lipid material is selected from the group consisting of animal waxes, vegetable waxes, mineral waxes, synthetic waxes and mixtures thereof.

29. The article of claim 28 wherein the waxy lipid material is selected from the group consisting of beeswax, lanolin, candelilla, petrolatum, microcrystalline wax, yellow ceresine wax, white ozokerite, polyethylene waxes, and mixtures thereof.

30. An article, which comprises:

a. a carrier; and

b. an emulsion having a continuous external lipid phase and a dispersed polar internal phase applied to the carrier;

wherein the emulsion is prepared by combining at least the following materials;

(1) from about 2 to about 60% of a waxy lipid material having a melting point of about 30°

C. or higher;

(2) from about 39 to about 97% of polar material; and

(3) an effective amount of a non-silicon containing emulsifier capable of forming the emulsion when the lipid is in a fluid state;

the emulsifier having a viscosity at 55°

C. of at least about 500 centipoise;

where the weight percent for each of components (1), (2) and (3) is determined from the amount combined relative to the total weight of the emulsion.

31. The article of claim 30 wherein the polar material comprises at least about 60%, by weight of the polar material, of water.

32. The article of claim 31 wherein the polar material comprises at least about 75%, by weight of the polar material, of water.

33. The article of claim 32 wherein the polar material comprises at least about 85%, by weight of the polar material, of water.

34. An article, which comprises:

a. a carrier; and

b. a lipid continuous emulsion applied to the carrier, the emulsion comprising;

(1) from about 2 to about 60% of a continuous solidified external lipid phase comprising a waxy lipid material having a melting point of about 30°

C. or higher;

(2) from about 39 to about 97% of an internal polar phase dispersed in the external lipid phase; and

(3) an effective amount of a non-silicon containing emulsifier capable of forming the emulsion when the external lipid phase is a hydrocarbyl-substituted carboxylic acid or anhydride, or an ester or amide thereof;

where the weight percent of each components (1), (2) and (3) is determined from the amount combined relative to the total weigh of the emulsion.

35. The article of claim 34 wherein the emulsion is prepared by further combining a second emulsifier, where the second emulsifier is a block copolymer comprising poly-12-hydroxystearic acid and polyethylene oxide monomer units.

36. The article of claim 34, wherein the second emulsifier is an organopolysiloxane-polyoxyalkylene.

37. A process for applying an emulsion to a carrier, which comprises the steps of:

A. forming a lipid continuous emulsion comprising;

(1) from about 2 to about 60% of a continuous solidified external lipid phase comprising a waxy lipid material having a melting point of about 30°

C. or higher;

(2) from about 39 to about 97% of an internal polar phase dispersed in the external lipid phase; and

(3) an effective amount of a non-silicon containing emulsifier capable of forming the emulsion when the external lipid phase is in a fluid state;

the emulsifier having a viscosity at 55°

C. of at least about 500 centipoise;

B. applying the emulsion to a carrier at temperature sufficiently high such that the external lipid phase has a fluid or plastic consistency; and

C. cooling the applied emulsion to a temperature sufficiently low such that the external lipid phase solidifies.

38. The process of claim 37 wherein the emulsion is applied to the carrier at temperature in the range from about 60°

to about 90°

C.

39. The process of claim 38 wherein the emulsion is applied to the carrier at temperature in the range from 70°

to about 80°

C.

40. The process of claim 37 wherein the emulsion is applied to the carrier by a step selected from the group consisting of spraying, printing coating, extruding, and combinations thereof.

41. The process of claim 40 wherein the emulsion is applied to the carrier at a constant volumetric flow rate.

42. The process of claim 40 wherein the emulsion is applied to the carrier by flexible rotogravure coating.

43. The process of claim 37 wherein the carrier is a paper web.

44. The process of claim 43 wherein the emulsion is applied to both sides of the paper web simultaneously.

45. The process of claim 43 wherein the paper web comprises two plies having opposed inner surfaces and wherein the emulsion is applied to at least one of the opposed inner surface.

46. The process of claim 37 wherein the emulsion comprises from about 5 to about 30% of the external lipid phase and from about 67 to about 92% of the internal polar phase.

47. The process of claim 46 wherein the waxy lipid material is selected from the group consisting of animal waxes, vegetable waxes, synthetic waxes and mixtures thereof.

48. The process of claim 37 wherein the emulsifier comprises from about 1 to about 10% of the emulsion, and wherein the emulsifier has an HLB value in the range of from about 1.5 to about 3.5 and is non-silicon containing.

49. The process of claim 37 wherein the emulsifier is a hydrocarbon-substituted succinic anhydride or acid, or derivative thereof.