Skin cleansing bar comprising a fatty alcohol with low mush

Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...

Reexamination Certificate

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C510S152000, C510S153000, C510S155000, C510S156000

Reexamination Certificate

active

06458751

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to cleansing bars, and more particularly to cleansing bars having low mush. Synthetic detergent or syndet toilet bars have found considerable use as mild cleansing bars but such bars have the potential to exhibit unacceptable mush levels. Furthermore, syndet melt cast formulations require a higher level of solubilizers and suspending or dispersing agents than extruded formulations to dissolve all the components of the formulation. These solubilizers, such as fatty alcohols disadvantageously increase the mush level of the bar.
2. The Related Art
U.S. Pat. No. 5,691,287 issued to Villars et al. on Nov. 25, 1997 discloses a sodium cocoyl isethionate cleansing bar containing cetyl and stearyl alcohol in a total concentration range of about 6 to 11 wt percent.
U.S. Pat. No. 5,372,751 issued to Rys-Cucciari et al. on Dec. 13, 1994 discloses an acyl isethionate cleansing bar containing free fatty alcohols of 8-22 carbon atoms in an amount of 0-10 wt. percent.
U.S. Pat. No. 5,994,281 issued to He et al. on Nov. 30, 1999 discloses an acyl isethionate cleansing bar containing fatty alcohols of 16 to 22 carbon atoms.
PCT publication No. WO 95/02035 to Chambers et al., published on Jan. 19, 1995 discloses a fatty acid soap bar with minor amounts of acyl isethionates and fatty alcohols of 16 to 22 carbon atoms.
The above patents and publications however, fail to disclose or suggest a specific range of either alkyl alcohols of 6 to 12 carbon atoms or alkenyl alcohols of 6 to 18 carbon atoms in a cleansing bar composition which unexpectedly decreases mush, increases hardness, and has excellent lather; especially for syndet formulations.
SUMMARY OF THE INVENTION
The present invention relates to a cleansing bar composition comprising an anionic surfactant, a C6 to C18 free fatty acid, and a fatty alcohol selected from a C6 to C12 alkyl alcohol; and a C6 to C18 alkenyl alcohol wherein the melting point of the alcohol is under about 35 C. Preferably the anionic surfactant is in the concentration range of about 5 to about 60 weight % and the C6 to C18 free fatty acid is in the concentration range of about 2 to about 40 weight %.
The inventive cleansing bar also preferably contains a hydrophobic emollient. Advantageously this emollient is in the concentration range of about 2 to about 40 weight % and is selected from triglycerides, hydrocarbons, silicones, fatty esters, and mixtures thereof. The anionic surfactant preferably includes a C8 to C18 alkali metal acyl isethionate, and the free fatty acid preferably includes 12-hydroxy stearic acid. Advantageously, the fatty alcohol includes an alcohol selected from lauryl alcohol, oleyl alcohol, and a mixture thereof.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to cleansing bar composition comprising:
a. an anionic surfactant in the concentration range of about 5 to about 60 weight %;
b. a C6 to C18 free fatty acid in the concentration range of about 2 to about 40 weight %; and
c. a fatty alcohol selected from a C6 to C12 alkyl alcohol; and a C6 to C18 alkenyl alcohol wherein the melting point of the alcohol is under about 35° C.
Preferably the cleansing bar further comprises a hydrophobic emollient in the concentration range of about 0.5 to about 40 weight %. More preferably the hydrophobic emollient is in the concentration range of about 15 to about 25 weight %. Most preferably the hydrophobic emollient is selected from triglycerides, hydrocarbons, silicones, fatty esters, and mixtures thereof.
The cleansing bar preferably contains an anionic surfactant in the concentration range of about 25 to about 55 weight %; a C6 to C18 free fatty acid in the concentration range of about 15 to about 25 weight %; and the melting point of the fatty alcohol is under about 25° C.
Preferably the anionic surfactant includes a C8 to C18 alkali metal acyl isethionate. More preferably, the anionic surfactant includes a C8 to C12 alkali metal acyl isethionate. Preferably the alkali metal acyl isethionate is in the concentration range of about 5 to about 45 weight %, more preferably about 15 to about 25 weight %. Advantageously, the alkali metal acyl isethionate includes sodium cocoyl isethionate.
Conventional structuring agent free fatty acids are used in the bar. Preferably the free fatty acid includes 12-hydroxy stearic acid. Preferably the 12-hydroxy stearic acid is in the concentration range of about 5 to about 20 weight %, more preferably about 10 to about 15 weight %.
Preferably the fatty alcohol is a C6 to C12 alkyl alcohol. More preferably the fatty alcohol includes an alcohol selected from lauryl alcohol, oleyl alcohol, and a mixture thereof. Preferably the fatty alcohol is in the concentration range of about 2 to about 20 weight %, more preferably about 4 to about 8 weight %.
Surfactants:
Surfactants are an essential component of the inventive toilet bar. They are compounds that have hydrophobic and hydrophilic portions that act to reduce the surface tension of the aqueous solutions they are dissolved in. Useful surfactants can include anionic, nonionic, amphoteric, and cationic surfactants, and blends thereof.
Anionic Surfactants:
The toilet bar of the present invention contains one or more anionic detergents. The anionic detergent active which may be used may be aliphatic sulfonates, such as a primary alkane (e.g., C
8
-C
22
) sulfonate, primary alkane (e.g., C
8
-C
22
) disulfonate, C
8
-C
22
alkene sulfonate, C
8
-C
22
hydroxyalkane sulfonate or alkyl glyceryl ether sulfonate (AGS); or aromatic sulfonates such as alkyl benzene sulfonate.
The anionic may also be an alkyl sulfate (e.g., C
12
-C
18
alkyl sulfate) or alkyl ether sulfate (including alkyl glyceryl ether sulfates). Among the alkyl ether sulfates are those having the formula:
RO(CH
2
CH
2
O)
n
SO
3
M
wherein R is an alkyl or alkenyl having 8 to 18 carbons, preferably 12 to 18 carbons, n has an average value of greater than 1.0, preferably greater than 3; and M is a
solubilizing cation such as sodium, potassium, ammonium or substituted ammonium. Ammonium and sodium lauryl ether sulfates are preferred.
The anionic may also be alkyl sulfosuccinates (including mono- and dialkyl, e.g., C
6
-C
22
sulfosuccinates); alkyl and acyl taurates, alkyl and acyl sarcosinates, sulfoacetates, C
8
-C
22
alkyl phosphates and phosphates, alkyl phosphate esters and alkoxyl alkyl phosphate esters, acyl lactates, C
8
-C
22
monoalkyl succinates and maleates, sulphoacetates, alkyl glucosides and acyl isethionates, and the like.
Sulfosuccinates may be monoalkyl sulfosuccinates having the formula:
R
4
O
2
CCH
2
CH(SO
3
M)CO
2
M; and
amide-MEA sulfosuccinates of the formula;
R
4
CONHCH
2
CH
2
O
2
CCH
2
CH(SO
3
M)CO
2
M
wherein R
4
ranges from C
8
-C
22
alkyl and M is a solubilizing cation.
Sarcosinates are generally indicated by the formula:
R
1
CON(CH
3
)CH
2
CO
2
M,
wherein R
1
ranges from C
8
-C
20
alkyl and M is a solubilizing cation.
Taurates are generally identified by formula:
R
2
CONR
3
CH
2
CH
2
SO
3
M
wherein R
2
ranges from C
8
-C
20
alkyl, R
3
ranges from C
1
-C
4
alkyl and M is a solubilizing cation.
The inventive bar contains anionic surfactants, preferably contains C
8
-C
8
acyl isethionates. These esters are prepared by reaction between alkali metal isethionate with mixed aliphatic fatty acids having from 6 to 18 carbon atoms and an iodine value of less than 20. At least 75% of the mixed fatty acids have from 12 to 18 carbon atoms and up to 25% have from 6 to 10 carbon atoms.
Total surfactants will generally range from about 5% to about 60% by weight of the toilet bar. Preferably, this component is present from about 25% to about 40% in the bar.
The acyl isethionate may be an alkoxylated isethionate such as is described in Ilardi et al., U.S. Pat. No. 5,393,466, titled “Fatty Acid Esters of Polyalkoxylated isethonic acid; issued Feb. 28, 1995; hereby incorporated by reference. This compound has the general formula:
wherein R is an alkyl group having 8 to 18 carbons, m is an integer fro

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