Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2002-05-20
2003-02-18
Delcotto, Gregory (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S191000, C510S427000, C510S428000, C510S433000, C510S470000, C510S503000
Reexamination Certificate
active
06521578
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to cleaning and disinfecting compositions and more particularly to compositions containing a special surfactant combination and ethoxylated amines and to their use for the production of cleaning compositions.
For some time, flush toilets have been cleaned using solid toilet blocks which are either suspended in the cistern or fastened below the rim of the lavatory bowl. Their function is to clean the surface of the lavatory bowl during the flushing process and, in particular, to mask unpleasant odors through the release of fragrances. In view in particular of their function to release fragrances, cleaners for flush toilets are also generally referred to in the literature as perfume blocks. Surfactants, builders, inorganic salts and, of course, fragrances and dyes are normally used for their production. Several such formulations are known from the prior art literature. U.S. Pat. No. 4,534,879 (Procter & Gamble), for example, describes solid cleaning compositions which contain as their surfactant component C
9-15
alkyl sulfates, alkyl benzenesulfonates and inorganic salts. EP 0 265 979 A1 (Akzo) describes thickened water-based cleaners which contain mixtures of cationic surfactants and amine oxides together with short-chain aryl sulfonates. EP 0 014 979 A1 (Henkel) describes toilet blocks which contain alkyl benzenesulfonates and alkyl sulfates and also fatty alcohol or alkylphenol ethoxylates. DE 43 370 32 C2 (Henkel) relates to toilet blocks containing alkyl sulfates, alkyl ether sulfates and alkyl glucosides. EP-A 0 268 967 (Henkel) discloses toilet blocks containing sodium lauryl sulfate and fatty acid monoethanolamide. The described toilet blocks are generally produced by casting, compression molding, extrusion or granulation processes which involve high outlay on machinery and, in many cases, suffer unwanted losses of perfume under the effect of the high temperatures prevailing (casting/extrusion processes). Another disadvantage is that the refill units widely used on ecological grounds can only be used after the block has been exhausted. Although desirable, refilling as and when required, for example for a stronger release of active ingredients or, more particularly, for more intensive emission of perfume, is not possible.
German patent DE 197 15 872 A1 (Henkel) describes gel-form lavatory cleaners with pseudoplastic properties which significantly reduce production difficulties and which can be produced less expensively by virtue of the simple technology involved. The problem of individual refillability can also be solved by pseudoplastic formulations of the type in question. These known gel-form toilet cleaners contain polysaccharides, more particularly xanthan gum, for establishing their pseudoplastic properties and, as surfactants, alkyl polyglycosides (compulsory) and anionic and/or nonionic co-surfactants (optional). However, these gel-form cleaners have to be produced taking special precautionary measures during formation of the gel in order to ensure on the one hand that no bubbles are formed and, on the other hand, that the other ingredients are incorporated in uniform distribution in the gel.
Accordingly, the complex problem addressed by the invention was to provide new cleaning compositions for hard surfaces, but preferably gel-form lavatory cleaners, that would have a viscosity which, on the one hand, would allow easy application and, on the other hand, would prevent them draining too quickly, even on inclined surfaces, in order to guarantee as long a contact time as possible. In addition, the compositions would have improved cleaning performance, would be bactericidal and would retain their advantageous viscosity without the use of typical thickeners. In addition, the compositions would exhibit good initial foaming behavior, would allow the incorporation of various perfume oils, even in large quantities, and finally would have a long useful life, i.e. would allow the lavatory to be flushed many times before exhaustion of the cleaning composition (flush count).
DESCRIPTION OF THE INVENTION
The present invention relates to cleaning compositions for hard surfaces containing
(a) alkyl and/or alkenyl oligoglycosides,
(b) alkyl and/or alkenyl (ether) sulfates and/or betaines and
(c) ethoxylated fatty amines.
It has surprisingly been found that the compositions according to the invention not only have an excellent cleaning performance and bactericidal effect, they also have a much higher viscosity than conventional compositions, even without thickeners, and show pseudoplastic behavior. Accordingly, the compositions according to the invention are distinguished not only by easy application and excellent drainage behavior, they also have a high foaming capacity, allow the incorporation of various perfumes, even in relatively large quantities, and—by virtue of their gel-like consistency—can be reliably “dosed” over prolonged periods, above all even from containers, for example in cisterns of lavatories. In addition, the water-based compositions may be completely or partly freed from water and compressed into blocks.
Alkyl and/or Alkenyl Oligoglycosides
Alkyl and alkenyl oligoglycosides which form component (a) are known nonionic surfactants which correspond to formula (I):
R
1
O—[G]
p
(I)
where R
1
is an alkyl and/or alkenyl group containing 4 to 22 carbon atoms, G is a sugar unit containing 5 or 6 carbon atoms and p is a number of 1 to 10. They may be obtained by the relevant methods of preparative organic chemistry. EP 0 301 298 A1 and WO 90/03977 are cited as representative of the extensive literature available on the subject. The alkyl and/or alkenyl oligoglycosides may be derived from aldoses or ketoses containing 5 or 6 carbon atoms, preferably glucose. Accordingly, the preferred alkyl and/or alkenyl oligoglycosides are alkyl and/or alkenyl oligoglucosides. The index p in general formula (I) indicates the degree of oligomerization (DP), i.e. the distribution of mono- and oligoglycosides, and is a number of 1 to 10. Whereas p in a given compound must always be an integer and, above all, may assume a value of 1 to 6, the value p for a certain alkyl oligoglycoside is an analytically determined calculated quantity which is generally a broken number. Alkyl and/or alkenyl oligoglycosides having an average degree of oligomerization p of 1.1 to 3.0 are preferably used. Alkyl and/or alkenyl oligoglycosides having a degree of oligomerization of less than 1.7 and, more particularly, between 1.2 and 1.4 are preferred from the applicational point of view. The alkyl or alkenyl group R
1
may be derived from primary alcohols containing 4 to 11 and preferably 8 to 10 carbon atoms. Typical examples are butanol, caproic alcohol, caprylic alcohol, capric alcohol and undecyl alcohol and the technical mixtures thereof obtained, for example, in the hydrogenation of technical fatty acid methyl esters or in the hydrogenation of aldehydes from Roelen's oxosynthesis. Alkyl oligoglucosides having a chain length of C
8
to C
10
(DP=1 to 3), which are obtained as first runnings in the separation of technical C
8-18
coconut oil fatty alcohol by distillation and which may contain less than 6% by weight of C
12
alcohol as an impurity, and also alkyl oligoglucosides based on technical C
9/11
oxoalcohols (DP=1 to 3) are preferred. In addition, the alkyl or alkenyl group R
1
may also be derived from primary alcohols containing 12 to 22 and preferably 12 to 14 carbon atoms. Typical examples are lauryl alcohol, myristyl alcohol, cetyl alcohol, palmitoleyl alcohol, stearyl alcohol, isostearyl alcohol, oleyl alcohol, elaidyl alcohol, petroselinyl alcohol, arachyl alcohol, gadoleyl alcohol, behenyl alcohol, erucyl alcohol, brassidyl alcohol and technical mixtures thereof which may be obtained as described above. Alkyl oligoglucosides based on hydrogenated C
12/14
coconut oil fatty alcohol having a DP of 1 to 3 are preferred.
Alkyl and/or Alkenyl Sulfates
Alkyl and/or alkenyl sulfates, which are o
Burgo Antonino
Kischkel Ditmar
Koester Rita
Stute Jutta
Cognis Deutschland GmbH
Delcotto Gregory
Drach John F.
Trzaska Steven J.
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