Shampoo compositions comprising a surfactant, an amino...

Details Shampoo compositions comprising a surfactant, an amino... Shampoo compositions comprising a surfactant, an amino...

1999-01-19

2001-08-21

Page, Thurman K. (Department: 1615)

Drug, bio-affecting and body treating compositions

Live hair or scalp treating compositions

Polymer containing

C424S070100, C424S070110, C424S070190, C424S070210, C424S070220, C424S070310, C510S119000, C510S122000

Reexamination Certificate

active

06277361

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to shampoo compositions, and more particularly to shampoo compositions containing emulsified particles of silicone, which compositions condition the hair leaving it softer and more manageable.
BACKGROUND AND PRIOR ART
The use of silicones as conditioning agents in cosmetic formulations is well known and widely documented in the patent literature. Generally, dispersed droplets of the silicone oil are suspended in the composition, which is then applied to the hair to deposit the silicone material on the hair shaft.
A problem encountered with silicone shampoo formulations is that the conditioning performance may be insufficient for many people, particularly in regions such as Japan and South East Asia where consumers desire a high level of conditioning and a “weighty” feel to their hair.
We have now found that improved conditioning performance from a surfactant-based shampoo composition can be achieved by the inclusion in the shampoo composition of a specific combination of silicones, namely amino functionalised silicone and high viscosity non-amino functionalised silicone.
U.S. Pat. No. 5,198,209 (Amway Corp) published 1993 discloses a conditioning shampoo with cleansing surfactant and a combination of dimethicone and trimethylsilylamodimethicone, and mentions that superior conditioning benefits are obtainable when an aminofunctional silicone is used with polyalkylsiloxane (e.g. dimethicone) or polyalkylarylsiloxane. For optimum conditioning the viscosity of the dimethicone is said to range from 30,000 to 100,000 cst.
L'Oreal EP 0 811 371 describes cleansing compositions for hair comprising surfactant and a conditioning system comprising (i) cationic polymer (ii) aminofunctional silicone (iii) insoluble non-aminofunctional silicone of viscosity less than or equal to 100,000 cst. The composition is said to improve wet and dry combing, manageability, softness and smoothness. This document specifically teaches against replacing 60,000 cst dimethicone with 300,000 cst dimethicone in a composition comprising amodimethicone.
SUMMARY OF THE INVENTION
The invention provides an aqueous shampoo composition comprising, in addition to water:
i) at least one surfactant chosen from anionic, nonionic, zwitterionic or amphoteric surfactants or mixtures thereof;
ii) an amino functionalised silicone; and
iii) emulsified particles of an insoluble, non-amino functionalised silicone, in which the viscosity of the silicone itself is at least 500,000 cst, preferably at least 1,000,000 cst.
DETAILED DESCRIPTION OF THE INVENTION
Surfactant
The composition according to the invention comprises a surfactant chosen from anionic, nonionic, zwitterionic or amphoteric surfactants or mixtures thereof.
Suitable anionic surfactants include the alkyl sulphates, alkyl ether sulphates, alkaryl sulphonates, alkanoyl isethionates, alkyl succinates, alkyl sulphosuccinates, N-alkoyl sarcosinates, alkyl phosphates, alkyl ether phosphates, alkyl ether carboxylates, and alpha-olefin sulphonates, especially their sodium, magnesium ammonium and mono-, di- and triethanolamine salts. The alkyl and acyl groups generally contain from 8 to 18 carbon atoms and may be unsaturated. The alkyl ether sulphates, alkyl ether phosphates and alkyl ether carboxylates may contain from one to 10 ethylene oxide or propylene oxide units per molecule, and preferably contain 2 to 3 ethylene oxide units per molecule.
Examples of suitable anionic surfactants include sodium oleyl succinate, ammonium lauryl sulphosuccinate, ammonium lauryl sulphate, sodium dodecylbenzene sulphonate, triethanolamine dodecylbenzene sulphonate, sodium cocoyl isethionate, sodium lauroyl isethionate and sodium N-lauryl sarcosinate. The most preferred anionic surfactants are sodium lauryl sulphate, triethanolamine lauryl sulphate, triethanolamine monolauryl phosphate, sodium lauryl ether sulphate 1EO, 2EO and 3EO, ammonium lauryl sulphate and ammonium lauryl ether sulphate 1EO, 2EO and 3EO.
Nonionic surfactants suitable for use in compositions of the invention may include condensation products of aliphatic (C
8
-C
18
) primary or secondary linear or branched chain alcohols or phenols with alkylene oxides, usually ethylene oxide and generally having from 6 to 30 ethylene oxide groups. Other suitable nonionics include mono- or di-alkyl alkanolamides. Example include coco mono- or di- ethanolamide and coco mono-isopropanolamide.
Amphoteric and zwitterionic surfactants suitable for use in compositions of the invention may include alkyl amine oxides, alkyl betaines, alkyl amidopropyl betaines, alkyl sulphobetaines (sultaines), alkyl glycinates, alkyl carboxyglycinates, alkyl amphopropionates, alkylamphoglycinates alkyl amidopropyl hydroxysultaines, acyl taurates and acyl glutamates, wherein the alkyl and acyl groups have from 8 to 19 carbon atoms. Examples include lauryl amine oxide, cocodimethyl sulphopropyl betaine and preferably lauryl betaine, cocamidopropyl betaine and sodium cocamphopropionate.
Generally, the surfactants are present in shampoo compositions of the invention in an amount of from 0.1 to 50%, preferably from 5 to 30%, more preferably from 10% to 25% by weight.
Amino Functionalised Silicone
By “amino functionalised silicone” is meant a silicone containing at least one primary, secondary or tertiary amine group, or a quaternary ammonium group.
Examples include:
(i) polysiloxanes having the CTFA designation “amodimethicone”, and the general formula:
HO—[Si(CH
3
)
2
—O—]
x
—[Si(OH)(CH
2
CH
2
CH
2
—NH—CH
2
CH
2
NH
2
)—O—]
y
—H
in which x and y are numbers depending on the molecular weight of the polymer, generally such that the molecular weight is between about 5,000 and 500,000.
(ii) polysiloxanes having the general formula:
R′
a
G
3−a
—Si(OSiG
2
)
n
—(OSiG
b
R′
2−b
)
m
—O—SiG
3−a
—R′
a
 in which:
G is selected from H, phenyl, OH or C
1-8
alkyl, e.g. methyl;
a is 0 or an integer from 1 to 3, preferably 0;
b is 0 or 1, preferably 1;
m and n are numbers such that (m+n) can range from 1 to 2000, preferably from 50 to 150;
m is a number from 1 to 2000, preferably from 1 to 10;
n is a number from 0 to 1999, preferably from 49 to 149, and
R′ is a monovalent radical of formula —C
q
H
2q
L in which q is a number from 2 to 8 and L is an aminofunctional group selected from the following:
—NR″—CH
2
—CH
2
—N(R″)
2
—N(R″)
2
—N
+
(R″)
3
A
−
—N
+
H(R″)
2
A
−
—N
+
H
2
(R″)A
−
—N(R″)—CH
2
—CH
2
—N
+
H
2
(R″)A
−
in which R″ is selected from H, phenyl, benzyl, or a saturated monovalent hydrocarbon radical, e.g. C
1-20
alkyl, and
A is a halide ion, e.g. chloride or bromide.
Suitable amino functionalised silicones corresponding to the above formula include those polysiloxanes termed “trimethylsilylamodimethicone” as depicted below, and which are sufficiently water insoluble so as to be useful in compositions of the invention:
Si(CH
3
)
3
—O—[Si(CH
3
)
2
—O—]
x
—[Si(CH
3
)(R—NH—CH
2
CH
2
NH
2
)—O—]
y
—Si(CH
3
)
3
wherein x+y is a number from about 50 to about 500, and wherein R is an alkylene group having from 2 to 5 carbon atoms. Preferably, the number x+y is in the range of from about 100 to about 300.
(iii) quaternary silicone polymers having the general formula:
{(R
1
)(R
2
)(R
3
)N
+
CH
2
CH(OH)CH
2
O(CH
2
)
3
[Si(R
4
)(R
5
)—O—]
n
—Si(R
6
)(R
7
)—(CH
2
)
3
—O—CH
2
CH(OH)CH
2
N
+
(R
8
)(R
9
)(R
10
)}(X
−
)
2
 wherein
R
1
and R
10
may be the same or different and may be independently selected from H, saturated or unsaturated long or short chain alk(en)yl, branched chain alk(en)yl and C
5
-C
8
cyclic ring systems;
R
2
thru' R
9
may be the same or different and may be independently selected from H, straight or branched chain lower alk(en)yl, and C
5
-C
8
cyclic ring systems;
n is a number within the range of about 60 to about 120, preferably about 80, and
X
−
is preferably

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