Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
1998-09-28
2001-01-09
Delcotto, Gregory R. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S336000, C510S350000, C510S433000, C510S434000, C510S477000, C510S488000, C510S499000, C510S514000
Reexamination Certificate
active
06172028
ABSTRACT:
The invention relates to mixtures comprising at least one polycarboxylate, at least one amine and at least one acid, to detergents containing them, and to their use as encrustation inhibitors in detergents and as encrustation inhibitors and scale inhibitors in rinse aids.
BE 773 260 describes detergents containing in addition to LAS and tripolyphosphate as softener component N-alkylpropanediamines, especially N-dodecylpropane-1,3-diamine, N-cocopropane-1,3-diamine or N-tallow fatty-propane-1,3-diamine.
EP-A-0 173 398 describes detergent compositions comprising a mixture of long-chain primary or secondary amines and cellulase as the essential textile softener ingredients. The amine used can be tallow fatty amine. The compositions may include alkali metal phosphates and polycarboxylates in addition to LAS and sodium triphosphate.
WO 86/07603 describes detergents for low washing temperatures which may contain ether amines, amido amines, glucamine or morpholine derivatives, and polycarboxylic acids.
GB-A-2 172 910 describes detergent compositions having textile softener properties. For this purpose use is made of specific primary, secondary or tertiary amines having a long-chain hydrocarbyl radical, especially N,N-dimethyllaurylamine or N-dimethylcocoamine, which may be mixed with a Broöstedt acid as dispersant. Acids mentioned include inorganic acids and organic acids, such as polymeric carboxylic acids. Monocarboxylic acids are preferred. The composition include LAS and sodium tripolyphosphate.
DE-A-195 32 717 describes detergents containing modified polyaspartic acids as encrustation inhibitors. The polyaspartic acids are polycondensation products of aspartic acid, certain amines, and phosphorus-containing acids.
WO 95/33035 describes detergent compositions which are particularly effective for removing fatty or oily dirt from substrates such as textile products or crockery. One detergent composition contains 0.5% by weight of 1-hexylamine, 9.0% by weight of C
12-16
fatty acid and 6.0% by weight of anhydrous citric acid, and also 10.0% by weight of oleyl sarcosinate.
It is an object of the present invention to provide encrustation inhibitors for detergents and rinse aids.
It is another object of the present invention to provide encrustation inhibitors for reduced-phosphate or phosphite-free detergents and rinse aids.
It is yet another object of the present invention to provide detergents and rinse aids comprising novel encrustation inhibitors.
It is a further object of the present invention to provide encrustation inhibitors for detergents and rinse aids which are easier to prepare than the aspartic acid polycondensates and which have a better action.
It is a further object to provide scale inhibitors for dishwashing compositions.
It is a further object to provide dishwashing compositions which comprise scale inhibitors.
It is a further object to provide scale inhibitors for dishwashing compositions that have a better action than conventional polycarboxylates.
We have found that these objects are achieved by a mixture comprising
(a) from 0.1 to 99% by weight of at least one polycarboxylate having at least 3 carboxyls,
(b) from 0.1 to 99% by weight of at least one amine having a pK
a
value of more than 9, and
(c) from 0.1 to 99% by weight of at least one acid selected from the group consisting of mineral acids and organic acids having one or two carboxyls and not more than 10 carbons,
with the proviso that the mixture contains less than 24% by weight of triphosphates and the total amount of the ingredients is 100% by weight, and by the use of this mixture in detergent or rinse aid formulations.
It has been found in accordance with the invention that mixtures comprising
(a) from 0.1 to 99% by weight, preferably from 30 to 97% by weight, in particular from 50 to 95% by weight, of at least one polycarboxylate having at least 3 carboxyls,
(b) from 0.1 to 99% by weight, preferably from 0.5 to 50% by weight, in particular from 1 to 25% by weight, of at least one amine having a pK
a
of more than 9, preferably from 9.5 to 12, and
(c) from 0.1 to 99% by weight, preferably from 0.3 to 50% by weight, in particular from 0.5 to 40% by weight, of at least one acid selected from the group consisting of mineral acids and organic acids having one or two carboxyls and not more than 10 carbons,
with the proviso that the mixture contains less than 24% by weight, preferably not more than 20% by weight, of triphosphates and the total amount of the ingredients is 100% by weight, have encrustation-inhibiting and scale-inhibiting properties which are better than those of pure polycarboxylates as described, for example, in DE-A-195 32 717.
A description will first be given of components (a), (b) and (c) of the novel mixtures.
Component (a)
Polycarboxylates which can be used in accordance with the invention have at least three carboxyl groups. These novel polycarboxylates may be monomeric compounds or may be polymeric compounds having a molecular weight distribution. It is possible to employ both naturally occurring and synthetic polycarboxylates. According to a preferred embodiment, the polycarboxylates used are biodegradable or can be eliminated in sewage plants. According to one embodiment of the invention, the weight-average molecular weights of the polycarboxylates are from 100 to 300,000, preferably from 800 to 500,000, in particular from 800 to 200,000.
REFERENCES:
patent: 4687592 (1987-08-01), Collins et al.
patent: 773 260 (1972-03-01), None
patent: 195 32 717 (1997-03-01), None
patent: 0 173 398 (1986-03-01), None
patent: 2172910 (1986-10-01), None
patent: WO 86/07603 (1986-12-01), None
Baur Richard
Bertleff Werner
Ehle Beate
Kroner Matthias
Potthoff-Karl Birgit
BASF - Aktiengesellschaft
Delcotto Gregory R.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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