Separating multi-phase personal wash composition in a transparent or translucent package

• US 6,429,177 B1
• Filed: 08/22/2000
• Issued: 08/06/2002
• Est. Priority Date: 08/22/2000
• Status: Expired due to Term

• Current Assignee: Unilever Home & Personal Care Usa Division Of Conopco, Inc.
• Original Assignee: Unilever Home & Personal Care Usa Division Of Conopco, Inc.
• Inventors: Williams, Jason Richard, Salmon, Tom, Aronson, Michael Paul, Massaro, Michael, Macaulay, Ernest Weatherley
• Primary Examiner(s): OGDEN JR, NECHOLUS
• Application Number:
  US09/643,142
• Time in Patent Office: 714 Days
• Field of Search: 510/130, 510/159, 510/426, 510/417, 510/427, 510/473, 510/490, 510/508, 510/509
• US Class Current: 510/130
• CPC Class Codes: A61K 8/03 Liquid compositions with two or more distinct layers
• CPC Class Codes: A61Q 19/10 Washing or bathing preparations

Abstract

The invention provides a single chamber transparent or translucent package and personal product composition where when standing, the product forms 2 or more visibly distinct phases and, when agitated, the composition forms a visible single phase.

Claims

1. A cleansing system comprising a single chamber transparent or translucent package and a personal product composition therein, wherein, when standing, said personal product composition forms two or more visibly distinct aqueous phases and, when agitated, said composition forms a visible single phase product,

wherein, when left to stand after said composition has been agitated and has formed a single phase, said composition will again form two or more visibly distinct aqueous phases within 24 hours;

wherein, said composition comprises;

(a) 5 to 35 wt % of surfactant selected from the group comprising anionic surfactants, nonionic surfactants, amphoteric surfactants, cationic surfactants, and mixtures thereof;

(b) 1 to 12 wt % of a thickener;

(c) 4 to 20 wt % of a polyalkylene glycol; and

(d) non-chelating mineral salt selected from the group consisting of alkali metal or alkaline earth sulfates, bisulfates, carbonates, bicarbonates, and mixtures thereof wherein said non-chelating mineral salt is present in an amount sufficient to induce a separation of said aqueous composition into at least two distinct aqueous layers that are present in a volume ratio of upper to lower phase of from 4;

1 to 1;

4.

2. The composition of claim 1 wherein the polyalkylene glycol (c) is a polyethylene glycol having MW 200 to 6,000 and is present at a level of 6-20 wt %.

3. The composition of claim 1 wherein the thickener (b) is selected from the group consisting of hydrophobically modified polyalkylene glycols, cellulose ethers, hydrophobically modified cellulose ethers, acrylic copolymers and hydrophobically modified polyurethanes.

4. The composition of claim 3 wherein the hydrophobically modified polyalkylene glycol is selected from the group consisting of PEG 160 sorbitan trisostearate, PEG 120 pentaerythrityl tetra stearate and mixtures thereof.

5. The composition of claim 1 wherein the non-chelating mineral salt (d) is magnesium sulfate.

6. The composition of claim 1 wherein one of the anionic surfactants (a) is selected from the group consisting of alkyl ethoxy sulfates, alkyl sulfate, alkoyl isethionates, alpha olefin sulfonates, alkyl carboxylates, alkyl ethoxy carboxylates, and their mixtures.

7. The composition of claim 1 wherein one of the amphoteric surfactants is coco amido propyl betaine.

8. The composition of claim 1 in which the composition additionally contains from 1 to 7 wt % of a hydrotrope selected from the group consisting of xylene sulfonates and low molecular weight mono and dihydric alcohols.

9. A cleansing system comprising a single chamber transparent or translucent package and a personal product composition therein, wherein, when standing, said personal product composition forms two or more visibly distinct aqueous phases and, when agitated, said composition forms a visible single phase product,

wherein, when left to stand after said composition has been agitated and has formed a single phase, said composition will again form two or more visibly distinct aqueous phases within 24 hours;

wherein, when in a two-phase mode, said composition comprises;

(1) an upper aqueous layer comprising;

(a) 5 to 35% by wt. of total composition (10 to about 75% by wt. upper aqueous phase of a lathering surfactant selected from the group consisting of anionic surfactant, nonionic surfactant, amphoteric/zwitterionic surfactant, cationic surfactant and mixtures thereof (preferably at least one anionic should be present);

(b) 5% to 20% by wt. total composition is a polyalkylene glycol;

(c) 1 to 2% by wt., of total composition a thickener/viscosity modifier; and

;

(2) a lower aqueous layer comprising;

(a) less than 10% of the total surfactant present in the composition of lathering surfactant as defined in (9)(a) above;

(b) less than 25% of total polyalkylene glycol as in (9)(b) above;

(c) less than 15% of total thickener as in (9)(c) above;

(d) non-chelating mineral salt selected from the group comprising alkali metal or alkaline earth sulfates, bisulfates, carbonates, bicarbonates, phosphates and their mixtures wherein said non-chelating mineral salt is present in an amount sufficient to induce a separation of said lower aqueous layer in a volume ratio of upper to lower phase of from 4;

1 to 1;

4;

wherein the viscosity of the lower layer is lower than the viscosity of the upper layer and the viscosity, after mixing is in the range of about 700 to 5000 mPas at a shear rate of 10s<sup>−

1</sup> at 25°

C.;

wherein the viscosity of the mixture is greater than the viscosity of either of the layers alone;

wherein the density of the lower layer is greater than the density of the upper layer; and

wherein substantially no recrystallization is visible after the composition has been left standing for greater than 6 months at 0°

C.; and

wherein there is no readily detectable hydrolysis after standing for 6 months at 45°

C.

10. A composition according to claim 9, wherein at least one anionic is present as part of surfactant (a).

11. A composition according to claim 9, wherein the polyalkylene glycol (1b) is a polyethylene glycol having a MW 200 to 6,000 and is present at a level of 6-20 wt % of the composition.

12. The composition of claim 9 wherein the thickener (1c) is present in the range of 1-10 wt % and is selected from the group consisting of hydrophobically modified polyalkylene glycols, cellulose ethers, hydrophobically modified cellulose ethers, acrylic copolymers and hydrophobically modified polyurethanes.

13. The composition of claim 12 wherein the hydrophobically modified polyalkylene glycol is selected from the group consisting of PEG 160 sorbitan trisostearate, PEG 120 pentaerythrityl tetra stearate and mixtures thereof.

14. The composition of claim 9 wherein the non-chelating mineral salt (2d) is magnesium sulfate.

15. The composition of claim 9 wherein one of the anionic surfactants (a) is selected from the group consisting of alkyl ethoxy sulfates, alkyl sulfate, alkoyl isethionates, alpha olefin sulfonates, alkyl carboxylates, alkyl ethoxy carboxylates, and their mixtures.

16. The composition of claim 9 wherein one of the amphoteric surfactants (a) is coco amido propyl betaine.

17. The composition of claim 9 in which the composition additionally contains from 1 to 7 wt % of a hydrotrope selected from the group comprising xylene sulfonates, and low molecular weight mono and dihydric alcohols.

18. A composition according to claim 17, wherein the sugar ester is PEG (160) sorbitan triisostearate.