WO2006015149A1

WO2006015149A1 - Bar soap compositions with enhanced lather properties

Info

Publication number: WO2006015149A1
Application number: PCT/US2005/026845
Authority: WO
Inventors: Robert Demson; James Dalton; Jayesh Patel
Original assignee: Dial Corp
Current assignee: Dial Corp
Priority date: 2004-07-29
Filing date: 2005-07-28
Publication date: 2006-02-09
Anticipated expiration: 2007-01-29

Abstract

This invention relates to solid soap compositions which have greatly improved lather creaminess (lotion like feel) and bar slip in use. These improvements are achieved through a synergistic combination of high and low molecular weight polyols along with a co-surfactant. More specifically, it ha been found that a vegetable based fatty acid soap when combined with about 0.10 to 5.00% by weight of cocoamidopropyl hydroxy sultaine (amphoteric co-surfactant) and about 0.10 to about 4.00% by weight of PEG-12 (low molecular weight polyol) and about 0.01% to about 1.00% by weight of PEG-90M (high molecular weight polyol) results in a soap composition with greatly improved lather creaminess and slip in use.

Description

Title: BAR SOAP COMPOSITIONS WITH ENHANCED LATHER

PROPERTIES

Inventors: Robert Demson, James Dalton, Jayesh Patel

Background of Invention

[0001] Soap, commonly defined as the salt of a fatty acid, is the reaction product of aqueous caustic soda with fats and oils from natural sources to form a surfactant molecule. In this respect sodium soap (i.e. basic soap) alone, although having both adequate cleansing and foaming characteristics, without additives does not exhibit the more desirable lather attributes generally associated with detergent, or synthetic surfactant systems as found in more costly combination or synthetic bar soap formulas. To enhance the foaming and/or lather attributes of basic soap the formulation chemist is challenged to find a skillful combination of additives within the hundreds of synthetic detergents and innumerable plasticizers, binders, moisturizers and fillers available that will fulfill consumer expectations beyond the manufacture of just an effective cleansing agent. Furthermore, the incorporation of an additive, or combination of additives, to produce an acceptable end product, while maintaining both manufacturing capabilities and processing efficiencies must be considered within formulation development.

[0002] Given this large array of materials, finding a unique combination yielding enhanced lather attributes in a basic soap while maintaining manufacturing and processing efficiencies is accomplished in the present invention. Detailed Description

[0003] This invention relates to solid soap compositions which have greatly improved lather creaminess (lotion like feel) and bar slip in use. These improvements are achieved through a synergistic combination of high and low molecular weight polyols along with a co-surfactant. More specifically, we have found that a vegetable based fatty acid solid soap when combined with about 0.10 to 5.00% by weight of cocoamidopropyl hydroxy sultaine (amphoteric co- surfactant) and about 0.10 to about 4.00% by weight of PEG-12 (low molecular weight polyol) and about 0.01% to about 1.00% by weight of PEG-90M (high molecular weight polyol) results in a solid soap composition with greatly improved lather creaminess and slip in use. As shown below, these additions are used at relatively low levels and allows for a cost effective way to deliver these enhanced properties to a basic soap formula, which does not offer these properties.

[0004] By a "low molecular weight" polyol we mean a polyol having a molecular weight below about 3000. A "high molecular weight polyol is one having a molecular weight of about 20,000 or more. Example(s): [0005] To test the effectiveness of this invention, a series of soap bars were prepared. The soap employed in these bars was a vegetable based soap having an 80:20 ratio of palm oil fatty acids to coco fatty acids.

[0006] A panel of people were assembled to wash their hands with the soap bars shown in the following table. Each panelist was asked to rate the lather creaminess and bar slip as "poor", "average" or "excellent". PEG-12 was used at a level of 2.5% by weight; cocoamidopropyl hydroxysultaine at a level of 1.5% by weight; and PEG-90M at a level of 0.06% by weight.

[0007] From the above chart, it is clear that both the plain bar soap and bar soap with PEG-

12 were rated as "poor". The bars which included the amphoteric (hydroxysultaine); the PEG-90M and the combination of PEG-12 and PEG-90M all were judged as "average". However, the bars which contained the hydroxysultaine, PEG-12 and PEG-90M were rated as "excellent" in lather creaminess and bar slip.

Claims

1. A solid soap composition having enhanced lather properties comprising from about 75 to 90% by weight of an alkali metal salt of a fatty acid, from about 0.10 to about 5.0% by weight of an amphoteric surfactant, about 0.10 to about 4.0% by weight of a low molecular weight polyol, and about 0.10% to about 1.0% by weight of a high molecular weight polyol.

2. The soap composition of claim 1 wherein said amphoteric surfactant is cocoamidopropyl hydroxy sultaine.

3. The soap composition of claim 2 wherein said low molecular weight polyol is PEG- 12.

4. The soap composition of claim 3 wherein said high molecular weight polyol is PEG- 9OM.

5. The soap composition of claim 4 wherein said soap is a vegetable based soap having an 80/20 ratio of palm oil fatty acids to coco fatty acids.

6. A solid soap composition having enhanced lather properties comprising from about 75 to about 90% of an alkali metal salt of fatty acids, about 1.5% by weight of an amphoteric surfactant, about 2.5% by weight of PEG-12, and about 0.06% by weight of PEG-90M.