Patent Application
20060247144
The present invention relates to the use of metal complex compounds which have terpyridine ligands and contain at least one quaternized nitrogen atom as oxidation catalysts in dishwasher detergent formulations.
Peroxide-containing bleaching agents have been used in washing and cleaning processes for some time. Such agents are particularly useful in dishwasher applications to aid the removal of foodstuff residues and stains produced on crockery and other kitchenware in cooking processes. Their action is particularly important on coloured stains such as those produced by tomato based foodstuffs and tea.
Peroxide containing bleaching agents have been found to perform well at a liquor temperature of 90° C. and above, but their performance noticeably decreases with lower temperatures. Thus when crockery and other kitchenware is washed in a dishwasher at lower temperatures, there can be a problem of incomplete stain removal. This is unpleasant from an aesthetic point of view and also can present detrimental hygiene issues.
It is known that various transition metal ions, added in the form of suitable salts, or coordination compounds containing such cations, activate H2O2. In that way it is possible to increase the bleaching action of H2O2, or of precursors that release H2O2, or of other peroxo compounds, the bleaching action of which is unsatisfactory at lower temperatures. Particularly significant in the dishwasher context are those combinations of transition metal ions and ligands the peroxide activation of which is manifested in an increased tendency towards oxidation in respect of substrates (stains and foodstuffs) and not only in a catalase-like disproportionation. The latter activation, which tends rather to be undesirable in the present case, could even impair the bleaching effects of H2O2 and its derivatives which are insufficient at low temperatures.
In respect of H2O2 activation having effective bleaching action, mononuclear and polynuclear variants of manganese complexes with various ligands, especially with 1,4,7-trimethyl-1,4,7-triazacyclononane and optionally oxygen-containing bridge ligands, are currently regarded as being especially effective. Such catalysts have adequate stability under practical conditions and, with Mn+, contain an ecologically acceptable metal cation, but their use is unfortunately associated with high cost implications.
The aim of the present invention was, therefore, to provide improved metal complex catalysts for oxidation processes which fulfil the above demands and, especially, improve the action of peroxide compounds in a dishwashing environment without giving rise to any appreciable damage of items being cleaned or the dishwasher itself.
The invention accordingly relates to an automatic dishwasher detergent formulation of metal complex compounds of formula (1) comprising
(a) a metal complex compound of formula (1)
[LnMemXp]zYq (1),
wherein Me is manganese, titanium, iron, cobalt, nickel or copper,
The C1-C18alkyl radicals mentioned are generally, for example, straight-chain or branched alkyl radicals, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl or straight-chain or branched pentyl, hexyl, heptyl or octyl. Preference is given to C1-C12alkyl radicals, especially C1-C8alkyl radicals and preferably C1-C4alkyl radicals. The mentioned alkyl radicals can be unsubstituted or substituted e.g. by hydroxyl, C1-C4alkoxy, sulfo or by sulfato, especially by hydroxyl. The corresponding unsubstituted alkyl radicals are preferred. Very special preference is given to methyl and ethyl, especially methyl.
Examples of aryl radicals that generally come into consideration are phenyl or naphthyl unsubstituted or substituted by C1-C4alkyl, C1-C4alkoxy, halogen, cyano, nitro, carboxyl, sulfo, hydroxyl, amino, N-mono- or N,N-di-C1-C4alkylamino unsubstituted or substituted by hydroxy in the alkyl moiety, N-phenylamino, N-naphthylamino, where the amino groups may be quaternized, phenyl, phenoxy or by naphthoxy. Preferred substituents are C1-C4alkyl, C1-C4alkoxy, phenyl and hydroxy. Special preference is given to the corresponding phenyl radicals.
The C1-C6alkylene groups mentioned are generally, for example, straight-chain or branched alkylene radicals such as methylene, ethylene, n-propylene or n-butylene. The alkylene radicals mentioned can be unsubstituted or substituted, for example by hydroxyl or C1-C4alkoxy.
Halogen is generally preferably chlorine, bromine or fluorine, special preference being given to chlorine.
Examples of cations that generally come into consideration are alkali metal cations, such as lithium, potassium and especially sodium, alkaline earth metal cations, such as magnesium and calcium, and ammonium cations. The corresponding alkali metal cations, especially sodium, are preferred.
Suitable metal ions for Me are e.g. manganese in oxidation states II-V, titanium in oxidation states III and IV, iron in oxidation states I to IV, cobalt in oxidation states I to III, nickel in oxidation states I to III and copper in oxidation states I to III, with special preference being given to manganese, especially manganese in oxidation states II to IV, preferably in oxidation state II. Also of interest are titanium IV, iron II-IV, cobalt II-III, nickel II-III and copper II-III, especially iron II-IV.
For the radical X there come into consideration, for example, CH3CN, H2O, F−, Cl−, Br−, HOO−, O22−, O2−, R17COO−, R17O−, LMeO− and LMeOO−, wherein R17 is hydrogen, —SO3C1-C4alkyl or unsubstituted or substituted C1-C18alkyl or aryl, and C1-C18alkyl, aryl, L and Me have the definitions and preferred meanings given hereinabove and hereinbelow. R17 is especially preferably hydrogen, C1-C4alkyl; sulfophenyl or phenyl, especially hydrogen.
As counter-ion Y there come into consideration, for example, R17COO−, ClO4−, BF4−, PF6−, R17SO3−, R17SO4−, SO42−, NO3−, F−, Cl−, Br− and I−, wherein R17 is hydrogen or unsubstituted or substituted C1-C18alkyl or aryl. R17 as C1-C18alkyl or aryl has the definitions and preferred meanings given hereinabove and hereinbelow. R17 is especially preferably hydrogen, C1-C4alkyl; phenyl or sulfophenyl, especially hydrogen or 4-sulfophenyl. The charge of the counter-ion Y is accordingly preferably 1− or 2−, especially 1−. Y can also be a customary organic counter-ion, such as citrate, oxalate or tartrate.
n is preferably an integer having a value of from 1 to 4, preferably 1 or 2 and especially 1.
m is preferably an integer having a value of 1 or 2, especially 1.
p is preferably an integer having a value of from 0 to 4, especially 2.
z is preferably an integer having a value of from 8− to 8+, especially from 4− to 4+ and especially preferably from 0 to 4+. z is more especially preferably the number 0.
q is preferably an integer from 0 to 8, especially from 0 to 4 and is especially preferably the number 0.
R12 is preferably hydrogen, a cation, C1-C12alkyl, or phenyl unsubstituted or substituted as indicated above. R12 is especially preferably hydrogen, an alkali metal cation, alkaline earth metal cation or ammonium cation, C1-C4alkyl or phenyl, more especially hydrogen or an alkali metal cation, alkaline earth metal cation or ammonium cation.
R13 is preferably hydrogen, C1-C12alkyl, or phenyl unsubstituted or substituted as indicated above. R13 is especially preferably hydrogen, C1-C4alkyl or phenyl, more especially hydrogen or C1-C4alkyl, preferably hydrogen. Examples of the radical of the formula —OR13 that may be mentioned include hydroxyl and C1-C4alkoxy, such as methoxy and especially ethoxy.
When R14 and R15 together with the nitrogen atom bonding them form a 5-, 6- or 7-membered ring it is preferably an unsubstituted or C1-C4alkyl-substituted pyrrolidine, piperidine, piperazine, morpholine or azepane ring, where the amino groups can optionally be quaternized, preferably the nitrogen atoms which are not directly bonded to one of the three pyridine rings A, B or C being quaternized. The piperazine ring can be substituted by one or two unsubstituted C1-C4alkyl and/or substituted C1-C4alkyl e.g. at the nitrogen atom not bonded to the phenyl radical. In addition, R14, R15 and R16 are preferably hydrogen, unsubstituted or hydroxyl-substituted C1-C12alkyl, or phenyl unsubstituted or substituted as indicated above. Special preference is given to hydrogen, unsubstituted or hydroxyl-substituted C1-C4alkyl or phenyl, especially hydrogen or unsubstituted or hydroxyl-substituted C1-C4alkyl, preferably hydrogen.
Preference is given to ligands of formula (2) wherein R6 is not hydrogen.
R6 is preferably C1-C12alkyl; phenyl unsubstituted or substituted by C1-C4alkyl, C1-C4alkoxy, halogen, cyano, nitro, carboxyl, sulfo, hydroxyl, amino, N-mono- or N,N-di-C1-C4alkylamino unsubstituted or substituted by hydroxy in the alkyl moiety, N-phenylamino, N-naphthylamino, phenyl, phenoxy or by naphthoxy; cyano; halogen; nitro; —COOR12 or —SO3R12 wherein R12 is in each case hydrogen, a cation, C1-C12alkyl, or phenyl unsubstituted or substituted as indicated above; —SR13, —SO2R13 or —OR13 wherein R13 is in each case hydrogen, C1-C12alkyl, or phenyl unsubstituted or substituted as indicated above; —NR14R15; —(C1-C6alkylene)-NR14R15; —N⊕R14R15R16; —(C1-C6alkylene)-N⊕R14R15R16; —N(R13)—(C1-C6alkylene)-NR14R15; —N(R13)—(C1-C6alkylene)-N⊕R14R15R16; —N(R13)—N—R14R15 or —N(R13)—N⊕R14R15R16, wherein R13 can have one of the above meanings and R14, R15 and R16 are each independently of the other(s) hydrogen, unsubstituted or hydroxyl-substituted C1-C12alkyl, or phenyl unsubstituted or substituted as indicated above, or R14 and R15 together with the nitrogen atom bonding them form a pyrrolidine, piperidine, piperazine, morpholine or azepane ring which is unsubstituted or substituted by at least one unsubstituted C1-C4alkyl and/or substituted C1-C4alkyl, wherein the nitrogen atom can be quaternized.
R6 is especially preferably phenyl unsubstituted or substituted by C1-C4alkyl, C1-C4alkoxy, halogen, phenyl or by hydroxyl; cyano; nitro; —COOR12 or —SO3R12 wherein R12 is in each case hydrogen, a cation, C1-C4alkyl or phenyl; —SR13, —SO2R13 or —OR13 wherein R13 is in each case hydrogen, C1-C4alkyl or phenyl; —N(CH3)—NH2 or —NH—NH2; amino; N-mono- or N,N-di-C1-C4alkylamino unsubstituted or substituted by hydroxy in the alkyl moiety, wherein the nitrogen atoms, especially the nitrogen atoms not bonded to one of the three pyridine rings A, B or C, may be quaternized; N-mono- or N,N-di-C1-C4alkyl-N⊕R14R15R16 unsubstituted or substituted by hydroxy in the alkyl moiety, wherein R14, R15, and R16 are each independently of the other(s) hydrogen, unsubstituted or hydroxyl-substituted C1-C12alkyl or phenyl unsubstituted or substituted as indicated above or R14 and R15 together with the nitrogen atom bonding them form a pyrrolidine, piperidine, piperazine, morpholine or azepane ring which is unsubstituted or substituted by at least one unsubstituted C1-C4alkyl and/or substituted C1-C4alkyl, wherein the nitrogen atom can be quaternized; N-mono- or N,N-di-C1-C4alkyl-NR14R15 unsubstituted or substituted by hydroxy in the alkyl moiety, wherein R14 and R15 can have one of the above meanings.
R6 is very especially preferably C1-C4alkoxy; hydroxy; phenyl unsubstituted or substituted by C1-C4alkyl, C1-C4alkoxy, phenyl or hydroxy; hydrazine; amino; N-mono- or N,N-di-C1-C4alkylamino unsubstituted or substituted by hydroxy in the alkyl moiety, wherein the nitrogen atoms, especially the nitrogen atoms which are not bonded to one of the three pyridine rings A, B or C, may be quaternized; or a pyrrolidine, piperidine, morpholine or azepane ring unsubstituted or substituted by one or two unsubstituted C1-C4alkyl and/or substituted C1-C4alkyl, wherein the nitrogen atom can be quaternized.
A likewise very especially preferred radical R6 is
wherein the ring and the two alkyl groups may additionally be substituted.
Especially important as radicals R6 are C1-C4alkoxy; hydroxy; hydrazine; amino; N-mono- or N,N-di-C1-C4alkylamino unsubstituted or substituted by hydroxy in the alkyl moiety, wherein the nitrogen atoms, especially the nitrogen atoms which are not bonded to one of the three pyridine rings A, B or C, may be quaternized; or a pyrrolidine, piperidine, piperazine, morpholine or azepane ring unsubstituted or substituted by at least one C1-C4alkyl, wherein the nitrogen atoms may be quaternized.
A further especially important example of R6 is the radical
wherein the ring and the two alkyl groups may additionally be substituted.
In this regard a highly preferred compound of formula (1) is shown below.
Very especially important as radicals R6 are C1-C4alkoxy; hydroxy; N-mono- or N,N-di-C1-C4alkylamino substituted by hydroxy in the alkyl moiety, wherein the nitrogen atoms, especially the nitrogen atoms which are not bonded to one of the three pyridine rings A, B or C, may be quaternized; or a pyrrolidine, piperidine, morpholine or azepane ring unsubstituted or substituted by at least one C1-C4alkyl, wherein the amino groups may be quaternized.
A further very especially important example of R6 is the radical
wherein the ring and the two alkyl groups may additionally be substituted.
As examples of the radical R6, particular mention may be made of
Hydroxyl is of particular interest here.
The preferred meanings given above for R6 apply also to R1, R2, R3, R4, R5, R7, R8, R9, R10 and R11, but these radicals may additionally be hydrogen.
In accordance with one embodiment of the present invention, R1, R2, R3, R4, R5, R7, R8, R9, R10 and R11 are hydrogen and R6 is a radical other than hydrogen having the definition and preferred meanings indicated above.
In accordance with a further embodiment of the present invention, R1, R2, R4, R5, R7, R8, R10 and R11 are hydrogen and R3, R6 and R9 are radicals other than hydrogen having the definitions and preferred meanings indicated above for R6.
Generally, at least one of the substituents R1—R11, preferably R3, R6 and/or R9, is one of the following radicals —(C1-C6alkylene)-N⊕R14R15R16; —N(R13)—(C1-C6alkylene)-N⊕R14R15R16; —N[(C1-C6alkylene)-N⊕R14R15R16]2; —N(R13)—N⊕R14R15R16, wherein R13 is as defined above and R14, R15 and R16 are preferably independently of the others hydrogen or substituted or unsubstituted C1-C18alkyl or aryl, or R14 and R15 together with the nitrogen atom bonding them form an substituted or substituted 5-, 6- or 7-membered ring which may contain further heteroatoms; or —NR14R15; —(C1-C6alkylene)-NR14R15; —N(R13)—(C1-C6alkylene)-NR14R15; —N[(C1-C6alkylene)-NR14R15]2; —N(R13)—N—R14R15 wherein R13 and R16 have the meanings indicated above and R14 and R15 together with the nitrogen atom bonding them form a 5-, 6- or 7-membered ring which is unsubstituted or substituted by at least one unsubstituted C1-C4alkyl and/or substituted C1-C4alkyl and may contain further heteroatoms, wherein at least one nitrogen atom which is not bonded to one of the pyridine rings A, B or C is quaternized.
More preferably at least one of the substituents R1—R11, preferably R3, R6 and/or R9, is one of the following radicals —(C1-C4alkylene)-N⊕R14R15R16; —N(R13)—(C1-C4alkylene)-N⊕R14R15R16; —N[(C1-C4alkylene)-N⊕R14R15R16]2; —N(R13)—N⊕R14R15R16, wherein R13 is hydrogen, substituted or unsubstituted C1-C12alkyl or aryl and R14, R15 and R16 are independently of the others hydrogen or substituted or unsubstituted C1-C12alkyl or aryl, or R14 and R15 together with the nitrogen atom bonding them form a 5-, 6- or 7-memered ring which is unsubstituted or substituted by at least one unsubstituted C1-C4alkyl and/or substituted C1-C4alkyl and may contain further heteroatoms; or —NR14R15; —(C1-C4alkylene)-NR14R15; —N(R13)—(C1-C4alkylene)-NR14R15; —N[(C1-C4alkylene)-NR14R15]2; —N(R13)—N—R14R15, wherein R13 and R16 are independently of the other hydrogen, substituted or unsubstituted C1-C12alkyl or aryl and R14 and R15 together with the nitrogen atom bonding them form an unsubstituted or substituted 5-, 6- or 7-membered ring which may contain further heteroatoms, wherein at least one nitrogen atom which is not bonded to one of the pyridine rings A, B or C is quaternized.
Most preferably at least one of the substituents R1—R11, preferably R3, R6 and/or R9, is one of the following radicals; —(C1-C4alkylene)-N⊕R14R15R16; —N(R13)—(C1-C6alkylene)-N⊕R14R15R16; —N[(C1-C6alkylene)-N⊕R14R15R16]2; —N(R13)—N⊕R14R15R16, wherein R13 is as defined above and R14, R15 and R16 are independently of the others hydrogen or substituted or unsubstituted C1-C12alkyl or aryl, or R14 and R15 together with the nitrogen atom bonding them form a 5-, 6- or 7-membered ring which may be unsubstituted or substituted by at least one unsubstituted C1-C4alkyl and/or substituted C1-C4alkyl and may contain further heteroatoms; or —NR14R15; —(C1-C6alkylene)-NR14R15; —N(R13)—(C1-C6alkylene)-NR14R15; —N[(C1-C6alkylene)-NR14R15]2; —N(R13)—N—R14R15 wherein R13 and R16 have the meanings indicated above and R14 and R15 together with the nitrogen atom bonding them form a substituted or unsubstituted 5-, 6- or 7-membered ring which may contain further heteroatoms, wherein the nitrogen atom which is not bound to one of the pyridine rings A, B or C is quaternized.
Optionally at least one of the substituents R1—R11, preferably R3, R6 and/or R9, is a radical
wherein the unbranched or branched alkylene group may be substituted and wherein the independently unbranched or branched alkyl groups may be substituted.
The piperazine ring may also be substituted.
Preferably at least one of the substituents R1—R11, preferably R3, R6 and/or R9, is a radical
wherein the unbranched or branched alkylene groups may be substituted and wherein the alkyl groups may, independently of the other, be substituted. The piperazine ring may also be substituted.
Preferred ligands L are those of the formula (3)
where R′3, R′6 and R′9 have the definitions and preferred meanings indicated above for R6, where R′3 and R′9 may additionally be hydrogen, likewise with the proviso that
More preferred as ligands L are those of the formula (3)
where R′3, R′6 and R′9 have the definitions and preferred meanings indicated above for R6, where R′3 and R′9 may additionally be hydrogen, with the proviso that
—N[(C1-C6alkylene)-NR14R15]2; —N(R13)—N—R14R15, wherein R13 and R16 have the meanings indicated above and R14 and R15 together with the nitrogen atom bonding them form a 5-, 6- or 7-membered ring which may be unsubstituted or substituted by at least one unsubstituted C1-C4alkyl and/or substituted C1-C4alkyl and may contain further heteroatoms, wherein at least one nitrogen atom which is not bonded to one of the pyridine rings A, B or C is quaternized, and that
Even more preferred as ligands L are those of the formula (3)
where R′3, R′6 and R′9 have the definitions and preferred meanings indicated above for R6, where R′3 and R′9 may additionally be hydrogen, with the proviso that
Especially preferred ligands L are those of the formula (3)
where R′3, R′6 and R′9 have the definitions and preferred meanings indicated above for R6, where R′3 and R′9 may additionally be hydrogen, with the proviso that
In particular, R′3, R′6 and R′9 can each be a radical
where R15 and R16 have the meanings indicated above and the ring may be substituted. R′3 and R′9 can likewise be hydrogen.
Preference is given to compounds in which 1 quaternized nitrogen atom is present. Likewise preferred are compounds in which 2 or 3 quaternized nitrogen atoms are present. Particular preference is given to compounds in which all quaternized nitrogen atoms are not bonded directly to one of the pyridine rings A, B or C.
The metal complex compounds of the formula (1) can be obtained analogously to known processes. They are obtained in a manner known per se by reacting at least one ligand of the formula (2) in the desired molar ratio with a metal compound, especially a metal salt, such as the chloride, to form the corresponding metal complex. The reaction is carried out, for example, in a solvent, such as water or a lower alcohol, such as ethanol, at a temperature of, for example, from 10 to 60° C., especially at room temperature.
Ligands of the formula (2) that are substituted by hydroxyl can also be formulated as compounds having a pyridone structure in accordance with the following scheme:
Generally, therefore, hydroxyl-substituted terpyridines are also to be understood as including those having a corresponding pyridone structure.
The ligands of the formula (2) can be prepared in a manner known per se. For this purpose, for example, a compound of the formula (4)
which contains no quaternized nitrogen atoms and
in which R′1—R′11 have the definitions and preferred meanings indicated above for the substituents R1—R11, with the exception of quaternized nitrogen atoms and the proviso that at least one of the substituents R′1—R′11 contains halogen, NO2 or OR18, wherein R18 is —SO2CH3 or tosylate, can be reacted with a corresponding stoichiometric amount of a compound of the formula (5)
HNR (5),
where R has one of the meanings of R1—R11, with the proviso that this contains a quaternizable nitrogen group which is not bonded directly to one of the three pyridine rings A, B or C. The stoichiometric amount of the compound (5) depends on the number of halogens, NO2 or OR18, wherein R18 is as defined above, present in the compound of the formula (4). Preference is given to compounds of the formula (4) which have 1, 2 or 3 such radicals. In a further step, the reaction product of the compound (4) and (5) is quaternized by means of known quaternizing agents, such as, in particular, methyl iodide or dimethyl sulfate, so that at least one quaternized nitrogen atom is present.
It has now been found that for the accelerated substitution of halide by amine on the terpyridine structure it is also possible to use catalytic amounts of non-transition metal salts, such as zinc(II) salts, which considerably simplifies the reaction procedure and working-up. Surprisingly, the formulation comprising metal complex compounds of formula (1) exhibits a markedly improved bleach-catalysing action on coloured stains on hard surfaces. Their efficacy is exceptionally evident in the removal of food stains from hard surfaces in automatic dishwashing. Indeed the addition of such complexes in catalytic amounts to a dishwashing agent that comprises a peroxy compound and optionally a further bleach activator (such as, for example, TAED (N,N,N′,N′-tetraacetylethylenediamine)) results in the substantial removal of e.g. tea stains on china. This is the case even when hard water is used, it being known that tea deposits are more difficult to remove in hard water than in soft water.
Formulations comprising the metal complex compounds of formula (1) also have, together with peroxy compounds, excellent antibacterial action. The use of the metal complex compounds of formula (1) for killing bacteria or for protecting against bacterial attack is therefore likewise of interest, especially in the field of automatic dishwashing where it is particularly important that the cleaned items, following a dishwashing operation, should be largely free of bacteria.
Generally the formulation comprises up to 15% by weight of the sulphonated polymer, more preferably the formulation comprises from 2-15% by weight, more preferably from 3-8% and most preferably about 5% by weight of the sulphonated polymer.
The sulphonated polymer preferably comprises a copolymer. Preferably, the copolymer comprises the following monomers:
Advantageously, the copolymer comprises:
More advantageously the corpolymer comprises.
The monoethylenically unsaturated C3-C6 monocarboxylic acid is preferably (meth)acrylic acid.
The unsaturated sulphonic acid monomer is preferably one of the following: 2-acrylamido methyl-1-propanesultonic acid, 2-methacrylamido-2-methyl-1-propanesulphonic acid, 3-methacrylamido-2-hydroxypropanesulphonic acid, allysulphonic acid, methallysulphonic acid, allyloxybenzenesulphonic acid, methallyloxybenzensulphonic acid, 2-hydroxy-3-(2-propenyloxy)propanesulphonic acid, 2-methyl-2-propene-1-sulphonic acid, styrene sulphonic acid, vinylsulphonic acid, 3-sulphopropyl acrylate, 3-sulphopropyl methacrylate, sulphomethylacrylamid, sulphomethylmethacrylamide, and water soluble salts thereof.
The unsaturated sulphonic acid monomer is most preferably 2-acrylamido-2-propanesulphonic acid (AMPS).
The weight average molecular weight of the copolymer according to the present invention is from 3,000 to 50,000 and preferably from 4,500 to 35,000.
Commercially available examples of the preferred sulphonated polymer are available from Rohm & Haas under the trade names Acusol 587G and Acusol 588G
The formulation preferably contains an agent which increases the pH of the dishwasher liquor. Preferably the pH is increased to above 8, more preferably to above 9, more preferably to above 10 and most preferably to around/above 10.5. Preferred pH increasing agents include hydroxide, carbonate, bicarbonate and other common salts. Agents which are used to provide a builder function (see later) may also be used, where suitable/appropriate to increase the pH of the dishwasher liquor.
The formulation preferably contains an enzyme.
The enzyme is preferably selected from the group consisting of cellulases, hemicellulases, peroxidases, proteases, gluco-amylases, amylases, xylanases, lipases, phospholipases, esterases, cutinases, pectinases, keratanases, reductases, oxidases, phenoloxidases, lipoxygenases, ligninases, pullulanases, tannases, pentosanases, malanases, beta.-glucanases, arabinosidases, hyaluronidase, chondroitinase, laccase or mixtures thereof.
The enzyme is most preferably a protease.
One suitable protease has maximum activity throughout the pH range of 8-12, and is sold as ESPERASE® by Novo Industries A/S of Denmark. Other suitable proteases include ALCALASE®, DURAZYM® and SAVINASE® also from Novo Industries and MAXATASE®, MAXACAL®, PROPERASE® and MAXAPEM® (protein engineered Maxacal) from Gist-Brocades. Further suitable proteases include PURAFECT® (available from Genencor); also EVERLASE® and OVOZYM® (available from Novozymes); and KEMZYM® (available from Biozym).
Suitable proteolytic enzymes also include modified bacterial serine proteases. Other suitable proteases include subtilisins which are obtained from B. subtilis and B. licheniformis.
Preferred proteases include carbonyl hydrolase variants having an amino acid sequence not found in nature, which are derived from a precursor carbonyl hydrolase by substituting a different amino acid for a plurality of amino acid residues.
The protease enzyme is preferably incorporated in the formulation of the present invention a level of from 0.0001% to 2% pure enzyme by weight of the formulation.
Amylases (alpha and/or beta) can be included in the formulation for removal of carbohydrate-based stains. Other suitable amylases are stability-enhanced amylases.
Examples of commercial alpha-amylases products are Purastar® and Purafect Ox Am® from Genencor. Further suitable commercially available alpha-amylases include Termamyl®, Ban®, Fungamyl® and Duramyl®, all available from Novo Nordisk A/S Denmark. Termamyl® is an alpha-amylases characterised by having a specific activity at least 25% higher than the specific activity of at a temperature range of 25.degree. C. to 55.degree. C. and at a pH value in the range of 8 to 10, measured by the Phadebas® alpha-amylase activity assay.
The amylolytic enzyme is preferably incorporated in the detergent compositions of the present invention a level of from 0.0001% to 2% pure enzyme by weight of the formulation.
The above-mentioned enzymes may be of any suitable origin, such as vegetable, animal, bacterial, fungal and yeast origin. Origin can further be mesophilic or extremophilic (psychrophilic, psychrotrophic, thermophilic, barophilic, alkalophilic, acidophilic, halophilic, etc.). Purified or non-purified forms of these enzymes may be used. Also included by definition, are mutants of native enzymes. Mutants can be obtained e.g. by protein and/or genetic engineering, chemical and/or physical modifications of native enzymes.
As enzymes can react detrimentally with other components of detergent formulations the enzyme may be separated from the remainder of the formulation. Separation is of particular consideration with regard to oxygen sources and oxidising agents, such as bleaches, which are known to cause deterioration of enzymes. The separation may be achieved by physical separation of the formulation into at least two components; such as by the use of a twin chamber bottle, a twin layer tablet or a twin compartment pouch; wherein the enzyme is separated from antagonistic components. An alternative means of separation is by encapsulation. The method of encapsulation and the material used for encapsulation may vary dependent on the physical nature of the formulation. For example in a liquid formulation an encapsulation agent such as wax may be used. Whereas in a solid formation a more rigid encapsulation material, such as a saccharide optionally in combination with a pigment such as titanium dioxide, may be used.
The dishwashing process is usually carried out by using an aqueous liquor comprising a peroxide and an amount of dishwasher detergent formulation such that from 0.1 to 200 mg of one or more compounds of formula (1) is/are present per litre of liquor. The dishwashing liquor more preferably contains from 1 to 75, more preferably from 3 to 50 and most preferably from 3 to 30 mg of the compound of formula (1) per litre of liquor. It will be understood that in such an application, the metal complex compounds of formula (1) can alternatively be formed in situ, the metal salt (e.g. manganese(II) salt, such as manganese(II) chloride) and the ligand being added in the desired molar ratios.
As the peroxide component there come into consideration, for example, the organic and inorganic peroxides known in the literature and available commercially that provide a bleach function at conventional dishwashing temperatures, for example at from 10 to 95° C. Preferably the formulation contains such a peroxide component.
The organic peroxides are, for example, mono- or poly-peroxides, especially organic peracids or salts thereof, such as phthalimidoperoxycaproic acid, peroxybenzoic acid, diperoxydodecanedioic acid, diperoxynonanedioic acid, diperoxydecanedioic acid, diperoxyphthalic acid or salts thereof.
Preferably, however, inorganic peroxides are used, for example persulfates, perborates, percarbonates and/or persilicates. Percarbonate and perborate are particularly preferred. Also hydrogen peroxide may be incorporated into the formulation. In this case it will be appreciated that a stabiliser and/or a thickener may be required to provide, for example, adequate stability (i.e. shelf-life) of the hydrogen peroxide. Also where hydrogen peroxide is used, for stability reasons, it may be separated from the rest of the formulation in a separate portion. Methods of separation may be similar to those discussed above in connection with enzymes.
It will be understood that mixtures of inorganic and/or organic peroxides can also be used. The peroxides may be in a variety of crystalline forms and have different water contents, and they may also be used together with other inorganic or organic compounds in order to improve their storage stability.
The formulation may contain a surfactant. Preferably the surfactant is present in an amount of up to 30 wt % of the formulation and more preferably up to 10 wt % of the formulation.
Suitable surfactants are selected from anionic, cationic, ampholytic and zwitterionic surfactants and mixtures thereof. As the formulation is for use in automatic dishwashing the surfactant is preferably low foaming in character. To achieve this aim the surfactant system for use in dishwashing methods may be suppressed.
Nonionic surfactants are preferred for incorporation into the formulation as they are recognised to provide a suds suppression benefit. The alkyl ethoxylate condensation products of an alcohol with from 1 to 80 moles of an alkylene (liner/branched aliphatic/aromatic optionally substituted C2 to C20 alkylene) oxide are suitable for this use. The alkyl chain of the alcohol can either be straight or branched, primary or secondary, and generally contains from 6 to 22 carbon atoms. Particularly preferred are the condensation products of alcohols having an alkyl group containing from 8 to 20 carbon atoms with from 2 to 10 moles of ethylene oxide per mole of alcohol. In this regard Suitable surfactants include POLY-TERGENT® SLF-18B nonionic surfactants by Olin Corporation.
Ethoxylated C6-C18 fatty alcohols and C6-C18 mixed ethoxylated/propoxylated fatty alcohols are suitable surfactants for use herein. Preferably the ethoxylated fatty alcohols are the C10-C18 ethoxylated fatty alcohols with a degree of ethoxylation of from 3 to 50, most preferably these are the C12-C18 ethoxylated fatty alcohols with a degree of ethoxylation from 3 to 40. Preferably the mixed ethoxylated/propoxylated fatty alcohols have an alkyl chain length of from 10 to 18 carbon atoms, a degree of ethoxylation of from 3 to 30 and a degree of propoxylation of from 1 to 10.
The condensation products of ethylene oxide with a hydrophobic base formed by the condensation of propylene oxide with propylene glycol are suitable for use herein. The hydrophobic portion of these compounds preferably has a molecular weight of from 1500 to 1800 and exhibits water insolubility. Examples of compounds of this type include certain of the commercially-available Pluronic™ surfactants, marketed by BASF.
The condensation products of ethylene oxide with the product resulting from the reaction of propylene oxide and ethylenediamine are suitable for use herein. The hydrophobic moiety of these products consists of the reaction product of ethylenediamine and excess propylene oxide, and generally has a molecular weight of from 2500 to 3000. Examples of this type of nonionic surfactant include certain of the commercially available Tetronic™ compounds, marketed by BASF.
In a preferred embodiment of the present invention the formulation comprises a mixed nonionic surfactant system.
The formulation may contain a builder/co-builder. Preferably the builder and/or co-builder is present in an amount of up to 90 wt % of the formulation and more preferably up to 70 wt % of the formulation.
By co-builder it is meant a compound which acts in addition to a builder compound to sequester (chelate) heavy metal ions. These components may also have calcium and magnesium chelation capacity, but preferentially they show selectivity to binding heavy metal ions such as iron, manganese and copper. Co-builders, which are typically acidic, having for example phosphonic acid or carboxylic acid functionalities, may be present either in their acid form or as a complex/salt with a suitable counter cation such as an alkali or alkaline metal ion, ammonium, or substituted ammonium ion, or any mixtures thereof. The molar ratio of said counter cation to the co-builder is preferably at least 1:1. Suitable co-builders for use herein include organic phosphonates, such as the amino alkylene poly(alkylene phosphonates), alkali metal ethane 1-hydroxy disphosphonates and nitrilo trimethylene phosphonates. Preferred among the above species are diethylene triamine penta(methylene phosphonate), ethylene diamine tri(methylene phosphonate)hexamethylene diamine tetra(methylene phosphonate) and hydroxy-ethylene 1,1 diphosphonate. Other suitable co-builders for use herein include nitrilotriacetic acid and polyaminocarboxylic acids such as ethylenediaminotetracetic acid, ethylenetriamine pentacetic acid, ethylenediamine disuccinic acid, ethylenediamine diglutaric acid, 2-hydroxypropylenediamine disuccinic acid or any salts thereof. Especially preferred is ethylenediamine-N,N′-disuccinic acid (EDDS) or the alkali metal, alkaline earth metal, ammonium, or substituted ammonium salts thereof, or mixtures thereof. Preferred EDDS compounds are the free acid form and the sodium or magnesium salt or complex thereof.
Suitable water-soluble builder compounds include the water soluble carboxylates or their acid forms, homo or copolymeric polycarboxylic acids or their salts in which the polycarboxylic acid comprises at least two carboxylic radicals separated from each other by not more than two carbon atoms, carbonates, bicarbonates, borates, phosphates, and mixtures of any of the foregoing. The carboxylate or polycarboxylate builder can be monomeric or oligomeric in type although monomeric polycarboxylates are generally preferred for reasons of cost and performance. Suitable carboxylates containing one carboxy group include the water soluble salts of lactic acid, glycolic acid and ether derivatives thereof. Suitable polycarboxylates containing two carboxy groups include the water-soluble salts of succinic acid, malonic acid, (ethylenedioxy) diacetic acid, maleic acid, diglycolic acid, tartaric acid, tartronic acid and fumaric acid, as well as the ether carboxylates and the sulphinyl carboxylates. Suitable polycarboxylates containing three carboxy groups include, in particular, water-soluble citrates, aconitrates and citraconates as well as succinate derivatives, lactoxysuccinates, and aminosuccinates, and the oxypolycarboxylate materials such as 2-oxa-1,1,3-propane tricarboxylates. Polycarboxylates containing four carboxy groups include oxydisuccinates, 1,1,2,2-ethane tetracarboxylates, 1,1,3,3-propane tetracarboxylates and 1,1,2,3-propane tetracarboxylates. Suitable polycarboxylates containing sulphur substituents include the sulphosuccinate derivatives, and the sulphonated pyrolysed citrates. Suitable alicyclic and heterocyclic polycarboxylates include cyclopentane-cis,cis,cis-tetracarboxylates, cyclopentadienide pentacarboxylates, 2,3,4,5-tetrahydrofuran-cis,cis,cis-tetracarboxylates, 2,5-tetrahydrofuran-cis-dicarboxylates, 2,2,5,5-tetrahydrofuran-tetracarboxylates, 1,2,3,4,5,6-hexane-hexacarboxylates and carboxymethyl derivatives of polyhydric alcohols such as sorbitol, mannitol and xylitol. Suitable aromatic polycarboxylates include mellitic acid, pyromellitic acid and the phthalic acid derivatives. Of the above, the preferred polycarboxylates are hydroxycarboxylates containing up to three carboxy groups per molecule, more particularly citrates. The parent acids of the monomeric or oligomeric polycarboxylate chelating agents or mixtures thereof with their salts, e.g. citric acid or citrate/citric acid mixtures are also contemplated as useful builder components. Borate builders, as well as builders containing borate-forming materials that can produce borate under detergent storage or wash conditions can also be used. Examples of suitable carbonate builders are the alkaline earth and alkali metal carbonates, preferably the sodium and potassium salts, including sodium carbonate and sesqui-carbonate and mixtures thereof with ultra-fine calcium carbonate. Highly preferred builder compounds for use in the present invention are water-soluble phosphate builders.
Specific examples of water-soluble phosphate builders are the alkali metal tripolyphosphates, sodium, potassium and ammonium pyrophosphate, sodium and potassium and ammonium pyrophosphate, sodium and potassium orthophosphate, sodium polymeta/phosphate in which the degree of polymerisation preferably ranges from 6 to 21, and salts of phytic acid. Specific examples of suitable water-soluble phosphate builders are the alkali metal tripolyphosphates, sodium and potassium and ammonium pyrophosphate, sodium and potassium orthophosphate, sodium polymetaphosphate in which the degree of polymerization preferably ranges from 6 to 21, and salts of phytic acid.
Thus in a preferred embodiment the present invention provides an automatic dishwasher detergent formulation containing
In addition to the bleach catalyst according to formula (1) it is also possible to use further transition metal salts or complexes known as bleach-activating active ingredients and/or conventional bleach activators, that is to say compounds that, under perhydrolysis conditions, yield unsubstituted or substituted perbenzo- and/or peroxo-carboxylic acids having from 1 to 10 carbon atoms, especially from 2 to 4 carbon atoms. Suitable bleach activators include the customary bleach activators that carry O- and/or N-acyl groups having the indicated number of carbon atoms and/or unsubstituted or substituted benzoyl groups. Preference is given to polyacylated alkylenediamines, especially tetraacetylethylenediamine (TAED), acylated glycolurils, especially tetraacetylglycoluril (TAGU), N,N-diacetyl-N,N-dimethylurea (DDU), acylated triazine derivatives, especially 1,5-diacetyl-2,4-dioxohexahydro-1,3,5-triazine (DADHT), compounds of formula (4):
wherein R′1 is a sulfonate group, a carboxylic acid group or a carboxylate group, and wherein R′2 is linear or branched (C7-C15)alkyl, especially activators known under the names SNOBS, SLOBS and DOBA, acylated polyhydric alcohols, especially triacetin, ethylene glycol diacetate and 2,5-diacetoxy-2,5-dihydrofuran, and also acetylated sorbitol and mannitol and acylated sugar derivatives, especially pentaacetylglucose (PAG), sucrose polyacetate (SUPA), pentaacetylfructose, tetraacetylxylose and octaacetyllactose as well as acetylated, optionally N-alkylated glucamine and gluconolactone. It is also possible to use the combinations of conventional bleach activators known from German Patent Application DE-A-44 43 177. Nitrile compounds that form perimine acids with peroxides also come into consideration as bleach activators.
The formulation may comprise an additional component which is typically associated with an automatic dishwasher detergent. Preferred examples of such additional components includes preservatives such as isothiazolinone, dyes, corrosion inhibitors (both dishwasher machine and glass/kitchenware corrosion inhibitors), perfumes, stability aids and dispersing aids.
The formulation according to the invention may take the form of a complete dishwashing detergent or in the alternative may take the form of a separate bleaching additive. In the latter case the bleaching additive may used for removing coloured stains on crockery/kitchenware in a separate liquor before the items are washed in a dishwasher. The bleaching additive can also be used in a liquor together with either a bleach-free washing agent or a bleach-containing washing agent as a bleach booster.
The formulation according to the invention may be in solid or liquid form. The liquid may be homogenous or multi-phase. One or more of the formulation components may be present in the form of a suspension.
When in liquid form the formulation may comprise a thickener, such as is commonly use to increase the viscosity of the formulation and appeal to the consumer. Preferred examples of such thickeners include Xantham gum, cellulose derivatives and polyacrylic acid derivatives. A preferred commercially available thickener is sold under the tradename Carbopol (available from BF Goodrich).
The formulation may be in the form of a powder. The powder may also be compressed into tablet form. If in tablet form the formulation may include a tabletting aid such as polyethyleneglycol.
The formulation may comprise granules of the metal catalyst of formula (1). Such granules preferably comprise:
As binder (b) there come into consideration anionic dispersants, non-ionic dispersants, polymers and waxes that are water-soluble, dispersible or emulsifiable in water.
The anionic dispersants used are, for example, commercially available water-soluble anionic dispersants for dyes, pigments etc.
The following products, especially, come into consideration: condensation products of aromatic sulfonic acids and formaldehyde, condensation products of aromatic sulfonic acids with unsubstituted or chlorinated diphenylene or diphenyl oxides and optionally formaldehyde, (mono-/di-)alkylnaphthalenesulfonates, sodium salts of polymerised organic sulfonic acids, sodium salts of polymerised alkylnaphthalenesulfonic acids, sodium salts of polymerised alkylbenzenesulfonic acids, alkylarylsulfonates, sodium salts of alkyl polyglycol ether sulfates, polyalkylated polynuclear arylsulfonates, methylene-linked condensation products of arylsulfonic acids and hydroxyarylsulfonic acids, sodium salts of dialkylsulfosuccinic acid, sodium salts of alkyl diglycol ether sulfates, sodium salts of polynaphthalenemethane-sulfonates, lignosulfonates or oxylignosulfonates or heterocyclic polysulfonic acids.
Especially suitable anionic dispersants are condensation products of naphthalenesulfonic acids with formaldehyde, sodium salts of polymerised organic sulfonic acids, (mono-/di-)-alkylnaphthalenesulfonates, polyalkylated polynuclear arylsulfonates, sodium salts of polymerised alkylbenzenesulfonic acid, lignosulfonates, oxylignosulfonates and condensation products of naphthalenesulfonic acid with a polychloromethyldiphenyl.
Suitable non-ionic dispersants are especially compounds having a melting point of, preferably, at least 35° C. that are emulsifiable, dispersible or soluble, for example the following compounds:
Especially suitable non-ionic dispersants are surfactants of formula
R23—O-(alkylene-O)n—R24
wherein
The substituents R23 and R24 are advantageously each the hydrocarbon radical of an unsaturated or, preferably, saturated aliphatic monoalcohol having from 8 to 22 carbon atoms. The hydrocarbon radical may be straight-chain or branched. R23 and R24 are preferably each independently of the other an alkyl radical having from 9 to 14 carbon atoms.
Aliphatic saturated monoalcohols that come into consideration include natural alcohols, e.g. lauryl alcohol, myristyl alcohol, cetyl alcohol or stearyl alcohol, and also synthetic alcohols, e.g. 2-ethylhexanol, 1,1,3,3-tetramethylbutanol, octan-2-ol, isononyl alcohol, trimethylhexanol, trimethylnonyl alcohol, decanol, C9-C11oxo-alcohol, tridecyl alcohol, isotridecyl alcohol and linear primary alcohols (Alfols) having from 8 to 22 carbon atoms. Some examples of such Alfols are Alfol (8-10), Alfol (9-11), Alfol (10-14), Alfol (12-13) and Alfol (16-18). (“Alfol” is a registered trade mark).
Unsaturated aliphatic monoalcohols are, for example, dodecenyl alcohol, hexadecenyl alcohol and oleyl alcohol.
The alcohol radicals may be present singly or in the form of mixtures of two or more components, e.g. mixtures of alkyl and/or alkenyl groups that are derived from soybean fatty acids, palm kernel fatty acids or tallow oils.
(Alkylene-O) chains are preferably divalent radicals of the formulae
Examples of a cycloaliphatic radical are cycloheptyl, cyclooctyl and preferably cyclohexyl.
As non-ionic dispersants there come into consideration preferably surfactants of formula
wherein
Further important non-ionic dispersants correspond to formula
wherein
The non-ionic dispersants above can be used in the form of mixtures. For example, as surfactant mixtures there come into consideration non-end-group-terminated fatty alcohol ethoxylates e.g. compounds wherein
Examples of non-ionic dispersants of formulae (7), (8) and (9) include reaction products of a C10-C13fatty alcohol, e.g. a C13oxo-alcohol, with from 3 to 10 mol of ethylene oxide, propylene oxide and/or butylene oxide or the reaction product of one mol of a C13fatty alcohol with 6 mol of ethylene oxide and 1 mol of butylene oxide, it being possible for the addition products each to be end-group-terminated with C1-C4alkyl, preferably methyl or butyl.
Such dispersants can be used singly or in the form of mixtures of two or more dispersants.
Instead of, or in addition to, the anionic or non-ionic dispersant, the granules according to the invention may comprise a water-soluble organic polymer as binder. Such polymers may be used singly or in the form of mixtures of two or more polymers.
Water-soluble polymers that come into consideration are, for example, polyethylene glycols, copolymers of ethylene oxide with propylene oxide, gelatin, polyacrylates, polymethacrylates, polyvinylpyrrolidones, vinylpyrrolidones, vinyl acetates, polyvinylimidazoles, polyvinylpyridine-N-oxides, copolymers of vinylpyrrolidone with long-chain α-olefins, copolymers of vinylpyrrolidone with vinylimidazole, poly(vinylpyrrolidone/dimethylaminoethyl methacrylates), copolymers of vinylpyrrolidone/dimethylaminopropyl methacrylamides, copolymers of vinylpyrrolidone/dimethylaminopropyl acrylamides, quaternised copolymers of vinylpyrrolidones and dimethylaminoethyl methacrylates, terpolymers of vinylcaprolactam/vinylpyrrolidone/dimethylaminoethyl methacrylates, copolymers of vinylpyrrolidone and methacrylamidopropyl-trimethylammonium chloride, terpolymers of caprolactam/vinyl-pyrrolidone/dimethylaminoethyl methacrylates, copolymers of styrene and acrylic acid, polycarboxylic acids, polyacrylamides, carboxymethylcellulose, hydroxymethylcellulose, polyvinyl alcohols, polyvinyl acetate, hydrolysed polyvinyl acetate, copolymers of ethyl acrylate with methacrylate and methacrylic acid, copolymers of maleic acid with unsaturated hydrocarbons, and also mixed polymerisation products of the mentioned polymers.
Of those organic polymers, special preference is given to polyethylene glycols, carboxymethylcellulose, polyacrylamides, polyvinyl alcohols, polyvinylpyrrolidones, gelatin, hydrolysed polyvinyl acetates, copolymers of vinylpyrrolidone and vinyl acetate, and also polyacrylates, copolymers of ethyl acrylate with methacrylate and methacrylic acid, and polymethacrylates.
Suitable water-emulsifiable or water-dispersible binders also include paraffin waxes.
Encapsulating materials (c) include especially water-soluble and water-dispersible polymers and waxes. Of those materials, preference is given to polyethylene glycols, polyamides, polyacrylamides, polyvinyl alcohols, polyvinylpyrrolidones, gelatin, hydrolysed polyvinyl acetates, copolymers of vinylpyrrolidone and vinyl acetate, and also polyacrylates, paraffins, fatty acids, copolymers of ethyl acrylate with methacrylate and methacrylic acid, and polymethacrylates.
Further additives (d) that come into consideration are, for example, wetting agents, dust removers, water-insoluble or water-soluble dyes or pigments, and also dissolution accelerators, and sequestering agents.
The preparation of the granules according may be carried out, for example, starting from:
a) a solution or suspension with a subsequent drying/shaping step or
b) a suspension of the active ingredient in a melt with subsequent shaping and solidification.
a) First of all the anionic or non-ionic dispersant and/or the polymer and, if appropriate, the further additives are dissolved in water and stirred, if desired with heating, until a homogeneous solution has been obtained. The metal catalyst is then dissolved or suspended in the resulting aqueous solution. The solids content of the solution should preferably be at least 30% by weight, especially 40 to 50% by weight, based on the total weight of the solution. The viscosity of the solution is preferably less than 200 mPas.
The aqueous solution so prepared, comprising the metal catalyst is then subjected to a drying step in which all water, with the exception of a residual amount, is removed, solid particles (granules) being formed at the same time. Known methods are suitable for producing the granules from the aqueous solution. In principle, both continuous methods and discontinuous methods are suitable. Continuous methods are preferred, especially spray-drying and fluidised bed granulation processes.
Especially suitable are spray-drying processes in which the active ingredient solution is sprayed into a chamber with circulating hot air. The atomisation of the solution is effected e.g. using unitary or binary nozzles or is brought about by the spinning effect of a rapidly rotating disc. In order to increase the particle size, the spray-drying process may be combined with an additional agglomeration of the liquid particles with solid nuclei in a fluidised bed that forms an integral part of the chamber (so-called fluid spray). The fine particles (<100 μm) obtained by a conventional spray-drying process may, if necessary after being separated from the exhaust gas flow, be fed as nuclei, without further treatment, directly into the atomizing cone of the atomiser of the spray-dryer for the purpose of agglomeration with the liquid droplets of the active ingredient.
During the granulation step, the water can rapidly be removed from the solutions comprising the metal catalyst, binder and further additives. It is expressly intended that agglomeration of the droplets forming in the atomising cone, or the agglomeration of droplets with solid particles, will take place.
If necessary, the granules formed in the spray-dryer are removed in a continuous process, for example by a sieving operation. The fines and the oversize particles are either recycled directly to the process (without being redissolved) or are dissolved in the liquid active ingredient formulation and subsequently granulated again.
A further preparation method according to a) is a process in which the polymer is mixed with water and then the catalyst is dissolved/suspended in the polymer solution, thus forming an aqueous phase, the metal catalyst being homogeneously distributed in that phase. At the same time or subsequently, the aqueous phase is dispersed in a water-immiscible liquid in the presence of a dispersion stabiliser in order that a stable dispersion is formed. The water is then removed from the dispersion by distillation, forming substantially dry particles. In those particles, the catalyst is homogeneously distributed in the polymer matrix.
The granules are preferably wear-resistant, low in dust, pourable and readily meterable. They can be added directly to the dishwasher or detergent formulation in a desired concentration.
Where the coloured appearance of the granules is to be suppressed, this can be achieved, for example, by embedding the granules in a droplet of a whitish meltable substance (“water-soluble wax”) or by adding a white pigment (e.g. TiO2) to the granule formulation or, preferably, by encapsulating the granules in a melt consisting, for example, of a water-soluble wax, as described in EP-A-0 323 407, a white solid being added to the melt in order to reinforce the masking effect of the capsule.
b) The catalyst may be dried in a separate step prior to the melt-granulation and, if necessary, dry-ground in a mill so that all the solids particles are smaller than 50 μm in size. The drying is carried out in an apparatus customary for the purpose, for example in a paddle dryer, vacuum cabinet or freeze-dryer.
The finely particulate catalyst is suspended in the molten carrier material and homogenised. The desired granules are produced from the suspension in a shaping step with simultaneous solidification of the melt. The choice of a suitable melt-granulation process is made in accordance with the desired size of granules. In principle, any process which can be used to produce granules in a particle size of from 0.1 to 4 mm is suitable. Such processes are droplet processes (with solidification on a cooling belt or during free fall in cold air), melt-prilling (cooling medium gas/liquid), and flake formation with a subsequent comminution step, the granulation apparatus being operated continuously or discontinuously.
Where the coloured appearance of the granules prepared from a melt is to be suppressed, in addition to the catalyst it is also possible to suspend in the melt white or coloured pigments which, after solidification, impart the desired coloured appearance to the granules (e.g. titanium dioxide).
If desired, the granules can be covered or encapsulated in an encapsulating material. Methods suitable for such an encapsulation include the customary methods and also the encapsulation of the granules by a melt consisting e.g. of a water-soluble wax, as described, for example, in EP-A-0 323 407, coacervation, complex coacervation and surface polymerisation.
Encapsulating materials (c) include e.g. water-soluble, water-dispersible or water-emulsifiable polymers and waxes.
Further additives (d) include e.g. wetting agents, dust-removers, water-insoluble or water-soluble dyes or pigments, and also dissolution accelerators, optical brighteners and sequestering agents.
The invention is illustrated by the following non-limiting examples
a) Step 1:
10.0 ml (0.130 mol) of N,N-dimethylformamide are added dropwise at 40° C. to 295 ml (4.06 mol) of thionyl chloride while stirring. 100 g (0.812 mol) of picolinic acid are subsequently added over the course of half an hour. The mixture is warmed carefully to 70° C. and stirred at this temperature for 24 hours, the gases formed being discharged via a wash bottle charged with sodium hydroxide solution. The mixture is evaporated, coevaporated another three times with 100 ml each time of toluene, diluted to 440 ml with the solvent and the solution is introduced into a mixture of 120 ml of absolute ethanol and 120 ml of toluene. The mixture concentrated to about half its volume, cooled to 4° C., filtered with suction and the solid is washed with toluene. Ethyl 4-chloropyridine-2-carboxylate hydrochloride is obtained as a beige, hygroscopic powder.
b) Step 2:
The hydrochloride obtained in step 1 is taken up in 300 ml of ethyl acetate and 200 ml of deionized water and rendered neutral with 4N sodium hydroxide solution. After phase separation, the aqueous phase is extracted twice more with 200 ml each time of ethyl acetate. The organic phases are combined, dried over sodium sulfate, filtered and concentrated. This gives ethyl 4-chloropyridine-2-carboxylate as a brown oil which can be purified by distillation if required. 1H-NMR (360 MHz, CDCl3): 8.56 (d, 1H, J=5.0 Hz); 8.03 (d, 1H, J=1.8 Hz); 7.39 (dd, 1H, J=5.4,1.8 Hz); 4.39 (q, 2H, J=7.0 Hz); 1.35 (t, 3H, J=7.0 Hz).
4 g (0.1 mol, about 60% dispersion) of sodium hydride in 100 ml of absolute tetrahydrofuran are placed in a reaction vessel under a nitrogen atmosphere. At above 56° C., a solution of 18.5 g (0.1 mol) of ethyl 4-chloropyridine-2-carboxylate and 2.32 g (0.04 mol) of dried acetone in 75 ml of THF is added dropwise over the course of two hours. The red suspension is then carefully poured into 900 ml of water. It is rendered neutral with 6N HCl, tetrahydrofuran is distilled off on a rotary evaporator, and the yellow to beige 1,5-bis(4-chloropyridin-2-yl)pentane-1,3,5-trione formed is filtered off. The dried, sparingly soluble product is processed further without any particular purification steps. IR (cm−1): 1619 (m); 1564 (s); 1546 (s); 1440 (m); 1374 (s); 1156 (m); 822 (w).
38.5 g (0.114 mol) of 1,5-bis(4-chloropyridin-2-yl)pentane-1,3,5-trione are suspended in 1.25 l of 2-propanol. A total of 230 ml of 25% (w/w) ammonia solution is added at 60° C.-70° C. over the course of five and a half hours. The mixture is cooled to 4° C. and the whitish 4,4″-dichloro-1′H-[2,2′;6′,2″]terpyridin-4′-one formed is filtered off. 1H-NMR (360 MHz, DMSO-d6): 8.65 (d, 2H, J=5.4 Hz); 8.57 (d, 2H, J=2.2 Hz); 7.82 (s, 2H); 7.59 (dd, 2H, J=5.4, 2.2 Hz).
A mixture of 10.89 g (34.2 mmol) of 4,4″-dichloro-1′H-[2,2′;6′,2″]terpyridin-4′-one, 68.6 g (685 mmol, 76.1 ml) of 1-methylpiperazine and 233 mg (1.71 mmol, 0.05 equivalent) of zinc(II) chloride in 200 ml of 2-methyl-2-butanol is boiled under reflux for 24 hours. The mixture is evaporated to dryness on a rotary evaporator. The crude product is recrystallized from ethyl acetate/methanol 33:1 (v/v). It is taken up in 100 ml of water, adjusted to pH=8-9 with 4N sodium hydroxide solution, and light-beige 4,4″-bis(4-methylpiperazin-1-yl)-1′H-[2,2′;6′,2″]terpyridin-4′-one is filtered off. 1H-NMR (360 MHz, CDCl3): 8.32 (d, 2H, J=5.9 Hz); 7.18 (dm, 2H); 6.93 (s, 2H); 6.66 (dd, 2H; J=5.9, 2.3 Hz); 3.41-3.32 (tm, 8H); 2.55-2.44 (tm, 8H); 2.29 (s, 6H).
2.66 ml (27.92 mmol) of dimethyl sulfate are added dropwise to a suspension of 6.22 g (13.96 mmol) of 4,4″-bis(4-methylpiperazin-1-yl)-1′H-[2,2′;6′,2″]terpyridin-4′-one in 250 ml of acetone. After twenty hours, doubly quaternized, whitish 4,4″-bis(4-methylpiperazin-1-yl)-1′H-[2,2′;6′,2″]terpyridin-4′-one is filtered off and washed (acetone). C29H43N7O9S2*0.39H2O, 704.86; calculated C, 49.42; H, 6.26; N, 13.91; S, 9.10; H2O, 1.00; found C, 49.30; H, 6.19; N, 13.85; S, 8.99; H2O, 1.00. 1H-NMR (360 MHz, D2O): 8.08 (d, J=5.9 Hz, 2H); 7.18 (dm, 2H); 6.79 (dd, J=5.9, 2.3 Hz); 6.74 (s, 2H); 3.77-3.68 (m, 8H); 3.65 (s, 6H); 3.59-3.50 (m, 8H).
A solution of 119 mg (0.6 mmol) of manganese(II) chloride tetrahydrate in 11 ml of methanol is added to a suspension of 419 mg (0.6 mmol) of the ligand C29H43N7O9S2. The mixture is subsequently evaporated on a rotary evaporator (30° C., 20 mbar final pressure). The manganese complex of the formula C29H43Cl2MnN7O9S2*2.22H2O (FW 863.67) is obtained as a yellow powder; calculated C, 40.33; H, 5.54; N, 11.35; S, 7.43; Cl, 8.21; Mn, 6.36; H2O, 4.63; found C, 41.10; H, 5.35; N, 11.77; S, 7.18; Cl, 8.36; Mn, 5.91; H2O, 4.64.
Compositions for use in a dishwashing machine were made without the use of bleaching components. These compositions are shown below.
Phosphourous—Containing
Phosphourous—Reduced
Phosphourous—Free
In each case the formulation was made into a tablet, having a weight of about 21 g.
To these base formulations bleach components were added as shown in the Examples.
The bleach performance of the resulting compositions were then tested according to IKW method (IKW-Arbeitskreis Maschinenspülmittel, “Methoden zur Bestimmung der Reinigungsleistung von maschinellen Geschirrspülmitteln (Part A and B)”, SÖFW, 11+14, 1998).
The cleaning of bleach-able stains using a dishwashing tablet containing a metal catalyst and per-oxygen source was compared to the performance of a composition containing the base and per-oxygen source and also with a tablet containing a commercially available activator (TAED).
Cleaning was tested in a Bosch SMS 5062 dishwashing machine using a 55° C. cycle. In each case a tablet comprising 23 g of the formulation was added at the start of the dishwasher main wash cycle. The results (given in each of the tables) are expressed as a percentage improvement in the treatment of bleach-able stains when using the composition according to the invention versus the comparison composition.
In each case where a metal catalyst was present, the metal catalyst of Synthesis Example 6 was used.
The performance of a base formulation was tested on bleach-able stains (tea) and the performance compared with a formulation comprising a metal catalyst, i.e. a formulation in accordance with the invention. In this Example the water hardness was 21° gH. The results are shown in Table 1 below.
As in Application Example 1 the performance of a base formulation was tested on bleachable stains (tea) and the performance compared with a formulation comprising a metal catalyst, i.e. a formulation in accordance with the invention. In this Example the water hardness was 21° gH. The results are shown in Table 2 below.
As in Application Example 1 the performance of a base formulation was tested on bleachable stains (tea) and the performance compared with a formulation comprising a metal catalyst, i.e. a formulation in accordance with the invention. In this Example the water hardness was 21° gH. The results are shown in Table 3 below.
As in Application Example 1 the performance of a base formulation was tested on bleachable stains (tea) and the performance compared with a formulation comprising a metal catalyst, i.e. a formulation in accordance with the invention. In this Example the water hardness was 21° gH. The results are shown in Table 4 below.
Here the effect of the metal catalyst in the presence of differing per-salts was tested. In each case the P-Containing formulation was used. In the first case the P-Containing formulation comprised perborate as the per-compound. In the second case the P-Containing formulation comprised percarbonate as the per-compound. (The percarbonate was present in the same wt % amount as the perborate)
As in Application Example 1 the performance of a base formulation was tested on bleachable stains (tea) and the performance compared with a formulation comprising a metal catalyst, i.e. a formulation in accordance with the invention. In this Example the water hardness was 21° gH. The results are shown in Table 5a and 5b below.
Here the effect of pH was tested.
In each case the stain removal (already enhanced by the presence of manganese) was further enhanced by the increase of pH.
| Number | Date | Country | Kind |
|---|---|---|---|
| 0329561.5 | Dec 2003 | GB | national |
