Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Specific organic component
Reexamination Certificate
2000-01-28
2001-05-01
Gupta, Yogendra (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Specific organic component
C510S276000, C510S289000, C510S300000, C510S315000, C510S334000, C510S367000, C510S377000, C510S443000, C510S444000, C510S485000, C510S507000, C510S509000, C510S531000, C510S532000, C510S533000, C510S534000
Reexamination Certificate
active
06225278
ABSTRACT:
The present invention relates to a solid textile detergent formulation comprising inorganic builders, glycine-N,N-diacetic acid derivatives, with or without small amounts of other anionic surfactants, nonionic surfactants and, if desired, further customary constituents.
Surfactants are the most important group of detergent ingredients. Their content in conventional reduced-phosphate or phosphate-free powder detergents is usually from 10 to 25% by weight. Surfactants detach liquid (oily) and solid fiber soiling during the washing process. However, the detergency of anionic surfactants, in particular, decreases with increasing water hardness. Builders, such as zeolites, are therefore used, their primary purpose being to increase the washing performance of the anionic surfactants by binding the calcium and magnesium ions that are responsible for water hardness.
Some solid soiling contains alkaline earth metal ions, in particular calcium ions. Removal of the calcium ions leads to a loosening of the soil structure and thus facilitates soil detachment from the fiber. In this connection, surfactants require the assistance of water-soluble complexing agents for calcium.
Glycine-N,N-diacetic acid derivatives are surface-active substances of this type. They reduce the surface tension of the washing water and effect soil detachment. They form complexes with Ca and Mg ions, remove particularly effectively calcium-containing soiling and, additionally, support the inorganic builders in their role of softening the washing water and preventing the build-up of fabric incrustations.
The use of said glycine-N,N-diacetic acid derivatives in solid textile detergent formulations is already known from WO-A-97/19159. This patent describes solid textile detergent formulations which comprise, as organic cobuilders, up to 40% by weight of such glycine-N,N-diacetic acid derivatives; these textile detergent formulations further comprise usual amounts of customary anionic surfactants, ie. about 10% by weight or more.
It is an object of the present invention to provide a solid textile detergent formulation in which the content of traditional anionic surfactants is drastically reduced and which comprises a detersive (surface-active) substance which is able to bind calcium and magnesium ions.
We have found that this object is achieved by a solid textile detergent formulation which comprises
(A) from 1 to 60% by weight of inorganic builders based on crystalline or amorphous alumosilicates, crystalline or amorphous silicates, carbonates and/or phosphates,
(B) from 1 to 40% by weight of one or more glycine-N,N-diacetic acid derivatives of the formula I
where
R is C
5
- to C
30
-alkyl or C
5
- to C
30
-alkenyl, each of which is unsubstituted or substituted by up to 5 hydroxyl, sulfate, sulfonate, formyl, C
1
- to C
4
-alkoxy, phenoxy or C
1
- to C
4
-alkoxycarbonyl groups, and may be interrupted by up to 5 nonadjacent oxygen and/or nitrogen atoms, R is furthermore alkoxylate of the formula —(CH
2
)
k
—O—(A
1
O)
m
—(A
2
O)
n
—Y, where A
1
and A
2
, independently of one another, are 1,2-alkylene having from 2 to 4 carbon atoms, Y is hydrogen, C
1
- to C
12
-alkyl, phenyl, C
1
- to C
4
-alkoxycarbonyl or sulfo, k is 1, 2 or 3, and m and n are each from 0 to 50, where the sum m+n must be at least 4, phenylalkyl having from 5 to 20 carbon atoms in the alkyl moiety, where the phenyl rings given in the meanings for R are unsubstituted or substituted by up to three C
1
- to C
4
-alkyl, hydroxyl, carboxyl, sulfo or C
1
- to C
4
-alkoxycarbonyl groups, or R is a radical of the formula
where A is a C
5
- to C
12
-alkylene bridge and
M is hydrogen, alkali metal, alkaline earth metal, ammonium or substituted ammonium in the corresponding stoichiometric quantities,
(C) from 0 to 6% by weight of anionic surfactants having one or more sulfate groups, one or more sulfonate groups, one or more phosphate groups or one or two carboxylate groups and
(D) from 0.5 to 50% by weight of nonionic surfactants.
The sum of all the detergent components given above and below is at most 100% by weight, including residual quantities of water.
Suitable inorganic builders (A) are in particular crystalline or amorphous alumosilicates having ion exchange properties, such as, in particular, zeolites. A variety of zeolite types are suitable, in particular zeolites A, X, B, P, MAP and HS in their Na form or in forms in which Na has partially been replaced by other cations, such as Li, K, Ca, Mg or ammonium. Suitable zeolites are described in EP-A 038 591, EP-A 021 491, EP-A 087 035, U.S. Pat. No. 4,604,224, GB-A 20 13 259, EP-A 522 726, EP-A 384 070 and WO-A 94/24251, for example.
Examples of suitable crystalline silicates (A) are disilicates or sheet silicates, eg. &dgr;-Na
2
Si
2
O
5
or &bgr;-Na
2
Si
2
O
5
(SKS 6 and SKS 7, Hoechst). The silicates can be used in the form of their alkali metal, alkaline earth metal or ammonium salts, preferably as Na, Li and Mg silicates. Amorphous silicates, for example sodium metasilicate, which has a polymeric structure, or amorphous disilicate (Britesil® H 20, Akzo) can also be used.
Suitable inorganic carbonate-based builder substances (A) are carbonates and hydrogencarbonates. These can be employed in the form of their alkali metal, alkaline earth metal or ammonium salts. Preference is given to carbonates and hydrogencarbonates of Na, Li and Mg, in particular sodium carbonate and/or sodium hydrogencarbonate.
Phosphates which are customarily used as inorganic builders (A) are polyphosphates, for example pentasodium triphosphate.
Said components (A) can be used individually or in mixtures with one another.
Component (A) is preferably present in the textile detergent formulation according to the invention in an amount of from 5 to 50% by weight, in particular from 10 to 45% by weight.
In a preferred embodiment, component (B) comprises compounds I in which R is a radical having at least 7 carbon atoms.
In a particularly preferred embodiment, component (B) comprises glycine-N,N-diacetic acid derivatives I in which R is a linear or branched unsubstituted C
7
- to C
30
-alkyl or C
7
- to C
30
-alkenyl radical, which may be interrupted by up to 5 nonadjacent oxygen and/or nitrogen atoms; said nitrogen atoms may carry hydrogen or C
1
- to C
8
-alkyl groups.
Compounds I are used in the form of the free acids or their alkali metal, alkaline earth metal, ammonium and substituted ammonium salts. Salts of this type which are especially suitable are the sodium, potassium and ammonium salts, in particular the trisodium, tripotassium and triammonium salts, and also organic triamine salts having a tertiary nitrogen atom.
Particularly suitable parent bases for the organic amine salts are tertiary amines, such as trialkylamines having from 1 to 6 carbon atoms in the alkyl moiety, eg. trimethyl- and triethylamine, methyldiethylamine or tricyclohexylamine, and trialkanolamines having 2 or 3 carbon atoms in the alkanol radical, preferably triethanolamine, tri-n-propanolamine or triisopropanolamine.
Alkaline earth metal salts which may be used are, in particular, the calcium and magnesium salts.
It is possible to employ the racemates of compounds I or the two enantiomers with respect to the a-carbon atom in the glycine backbone.
Suitable linear or branched alk(en)yl radicals as R are C
5
- to C
30
-alkyl and -alkenyl, particularly linear radicals derived from saturated or unsaturated fatty acids. Examples of individual R radicals are: n-pentyl, isopentyl, tert-pentyl, neopentyl, n-hexyl, n-heptyl, 3-heptyl (derived from 2-ethylhexanoic acid), n-octyl, isooctyl (derived from isononanoic acid), n-nonyl, n-decyl, n-undecyl, n-dodecyl, isododecyl (derived from isotridecanoic acid), n-tridecyl, n-tetradecyl, n-pentadecyl, n-hexadecyl, n-heptadecyl, n-octadecyl, n-nonadecyl, n-eicosyl and n-heptadecenyl (derived from oleic acid). R can also be a mixture, in particular one derived from naturally occurring fatty acids and from technical-grade acids produced synthetically, for example by oxo synthesis.
The C
5
- to C
12
-alkylene brid
Baur Richard
Bertleff Werner
Detering Jurgen
Ehle Beate
Oetter Gunter
BASF - Aktiengesellschaft
Boyer Charles
Gupta Yogendra
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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