Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2001-02-07
2004-02-10
Ogden, Necholus (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S309000, C510S310000, C510S367000, C510S372000, C510S375000, C510S424000, C510S426000
Reexamination Certificate
active
06689732
ABSTRACT:
TECHNICAL FIELD
The present invention relates to granular detergent compositions and in particular phosphate-containing detergent compositions, which comprise a specific hydrophobic peroxyacid bleaching system and a specific anionic surfactant system. The compositions are suitable for use in laundry washing methods.
BACKGROUND TO THE INVENTION
In the past decades research efforts have been directed towards the development of bleaching systems, based on organic peroxyacids, which can provide effective stain and/or soil removal from fabrics at lower wash temperatures. The organic peroxyacids are often obtained by the in situ perhydrolysis of organic peroxyacid bleach precursor compounds (bleach activators).
A commonly employed precursor compound is tetraacetyl ethylene diamine (TAED) which provides effective hydrophilic cleaning especially on beverage stains. Further organic peroxyacid precursors have thus been developed to deal with hydrophobic stains and soils.
However, to achieve effective bleaching of a detergent, both hydrophobic and hydrophilic stains need to be bleached by the bleach system. Furthermore, to achieve an effective or efficient bleach system, the system should provide excellent bleaching at low levels, thereby minimizing the chance of damage to the fabrics.
Thus, there is a need to provide detergent compositions which comprise low levels of a bleaching system, containing a bleach system, which has a very effective bleaching performance, having an excellent performance at both hydrophobic soils and hydrophilic soils.
Most conventional detergent compositions contain mixtures of various detersive surfactant components. Commonly encountered surfactant components include various anionic surfactants, especially the alkyl benzene sulphonates, alkyl sulfates, alkyl alkoxy sulfates and various nonionic surfactants, such as alkyl ethoxylates and alkylphenol ethoxylates.
The inventors have now surprisingly found that the introduction in detergent compositions comprising a hydrophobic bleaching system and one or more mono-functionalised anionic sulphate or/and sulphonate surfactant components, of specific anionic surfactants, which are relatively more-functionalised, results in an improved cleaning performance. Namely, in particular, anionic surfactants which are more-functionalised because they have more than one anionic charge or they have hydrophilic (substituent) groups or they have another anionic charge which is not a head group, have been found to improve the bleaching and cleaning performance of the detergent compositions containing a specific hydrophobic bleaching system and the additional mono-functionalised anionic surfactant. Without wishing to be bound by theory, it is believed that the use of relatively hydrophilic anionic surfactant facilitates the selective migration of one or more of the components of the hydrophobic bleaching system to the bleachable stains or soils specifically. It is believed that these more-functionalised anionic surfactant form effectively CO-micelles with the hydrophobic bleaching system, more easily than mono-functionalised surfactants. It is believed that this can facilitate the dissolution/dispersion of the hydrophobic bleaching system. Thereby, these components can efficiently bleach both hydrophilic and hydrophobic soils.
Thus, a low level of the hydrophobic bleaching system and the specific surfactant system can be used to achieve efficient and excellent bleaching and cleaning performance. Furthermore, surprisingly it has been found that the cleaning performance of these detergent compositions is achieved for a wide variety of stains and soils.
All documents cited in the present description are, in relevant part, incorporated herein by reference.
SUMMARY OF THE INVENTION
The present invention relates to a detergent composition comprising:
(a) from 1% to 70%, preferably from 10% to 30% by weight of an anionic surfactant system, comprising:
(i) at least 50% by weight of the system of one or more alkyl mono-sulphate and/or mono-sulphonate surfactant; and
(ii) one or more additional anionic surfactants selected from the group comprising:
(I) an alkyl ester sulphonate surfactant of formula
R
1
—CH(SO
3
M)—(A)
x
—C(O)—OR
2
wherein R
1
is a C
6
-C
22
hydrocarbyl, R
2
is a C
1
-C
6
alkyl, A is a C
6
-C
22
alkylene, alkenylene, x is 0 or 1, and M is a cation;
(II) a dianionic surfactant of formula
where R is an, optionally substituted, alkyl, alkyl, alkenyl, aryl, alkaryl, ether, ester, amine or amide group of chain length C
1
to C
28
, or hydrogen; A and B are independently selected from alkylene, alkenylene, (poly)alkoxylene, hydroxyalkylene, arylalkylene or amido alkylene groups of chain length C
1
to C
28
; whereby A, B, and R in total contain from 4 to about 31 carbon atoms; X and Y are anionic groups from the group comprising, carboxylate, sulfate and sulfonate, preferably least one of X or Y is a sulfate group; z is 0 or 1; and M is a cationic counterion;
(III) an alkyl alkoxylated sulphate of formula
R
5
O(A)
m
SO
4
M
wherein R
5
is a C
6
-C
24
alkyl or hydroxyalkyl group, A is an alkoxy unit, preferably ethoxy or propoxy, the average of m is at least 5, preferably at least 9 and M is a cationic counterion; and
b) from 0.01% to 10.0%, preferably from 0.5% to 4% by weight of the composition of a hydrophobic bleaching system comprising
(i) a percarboxylic acid of formula
R
1
—CO
3
M
wherein R
1
has at least 6 carbon atoms, and M is a counterion; or
(ii) a percarboxylic acid precursor of formula
R
1
—CO—L
wherein L is a leaving group which is linked to the R
1
—CO— group with an oxygen atom, and R
1
has at least 6 carbon atoms; or mixtures of (i) and (ii) with the proviso that when the more-functionalised anionic surfactant is a dianionic surfactant of formula (11), wherein R has 18 or 20 C-atoms which, is present at a level of 2% or 2.7% by weight of the composition, the weight ratio of said dianionic surfactant to the hydrophobic bleaching agent is not 1:1 or 1.35:1.
Preferably the detergent composition is a solid, preferably granular, phosphate-containing detergent composition.
DETAILED DESCRIPTION OF THE INVENTION
The detergent compositions of the invention comprise an anionic surfactant system containing one or more alkyl mono-sulphate or mono-sulphonate surfactants and one or more additional anionic surfactants of formula (I), (II) and (III) above.
The anionic surfactant system is present in the composition at a level of from 1% to 70% by weight of the composition, preferably from 10% to 30%, more preferably from 12% to 25% by weight of the composition.
The more-functionalised sulphate and sulphonate surfactants are present at least at a level of 50%, but more preferably at a level of at least 60%, most preferably of from 70% to 85% by weight of the system.
The weight ratio of the anionic surfactant system to the hydrophobic bleaching system is preferably from 1:10 to 100:1, more preferably from 1:1 to 80:1, more preferably from 1:1 to 50:1, most preferably from 5:1 to 30:1.
Anionic Alkyl Mono-sulphate Surfactant
The anionic mono-sulphate surfactants in accordance with the invention include the linear and branched primary and secondary alkyl sulphates, alkyl ethoxysulphates having an average ethoxylation number of 3 or below, fatty oleoyl glycerol sulphates, alkyl phenol ethylene oxide ether sulphates, the C
5
-C
17
acyl-N—(C
1
-C
4
alkyl) and —N—(C
1
-C
2
hydroxyalkyl)glucamine sulphates, and sulphates of alkylpolysaccharides.
Primary alkyl mono-sulphate surfactants are preferably selected from the linear and branched primary C
10-C
18
alkyl sulphates, more preferably the C
1
-C
15
branched chain alkyl sulphates and the C
12
-C
14
linear chain alkyl sulphates.
Preferred secondary alkyl mono-sulphate surfactant are of the formula
R
3
—CH(SO
4
M)—R
4
wherein R
3
is a C
8
-C
20
hydrocycarbyl, R
4
is a hydrocycarbyl and M is a cation.
Alkyl ethoxy mono-sulphate surfactants are preferably selected from the group consisting of the C
10
-C
18
alkyl sulphates which have been eth
Guedira Nour-Eddine
Ward Dawn Constance
Corstanie Brian J.
Dressman Marianne
Glazer Julia A.
Ogden Necholus
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