Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Specific organic component
Patent
1998-01-13
1999-11-02
Gupta, Yogendra
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Specific organic component
510276, 510287, 510318, 510335, 510361, 510398, 510434, 510480, 510488, C11D 108
Patent
active
059770520
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an improved washing process and new liquid detergents.
Many processes are known for washing laundry and textiles. A detergent, as the chemical aid, and a washing machine as a mechanical aid, and water, as the medium for taking up dirt, are usually employed (wet washing). With the water, the so-called water hardness essentially formed from ions of calcium and magnesium and of sulphate, carbonate and bicarbonate, is as overall also introduced into the washing process. The salts interfere with the washing process, since they can form salts with wash-active surfactants and since they prevent or make difficult the removal of stains from the goods to be washed. The water hardness is usually reduced by additives contained in the detergent, such as polyphosphates, zeolites or laminar silicates, so-called builders. This meets two limits: phosphates are permitted to only a limited extent according to detergent legislation, and zeolites or laminar silicates, which are introduced into the wash liquor as insoluble solids, require co-builders so that they can be rinsed out, with further water, of the goods to be washed. However, the combination of builder/cobuilder itself can be rinsed out only with a minimum amount of water (50-60 l), smaller amounts of water in the main washing operation lead to deposits on the laundry.
As an alternative to using builders, however, the water can also be at least partly softened (for example ion exchangers, reverse osmosis, electrodialysis), which renders the use of builders superfluous. Problems occur here, however, with foaming, (cf. G. Jakobi, M. J. Schwuger in Waschmittelchemie [Detergents chemistry], Henkel & Cie GmbH (publisher) Dusseldorf 1976, p. 103) if softened water is used in particular (and if appropriate with an overdose of the detergent), which can destroy the machine by an electrical short-circuit. Furthermore, softened water has to date been used for all the washing operations, that is to say also the first rinsing operation, so that since very soft water rinses the soap out of the textile less well, more water must be used for rinsing.
The invention is based on the object of providing an improved washing process.
The invention relates to a washing process for washing textiles with liquid detergents using softened water and salts of at least one polycarboxylic acid, characterized in that the polycarboxylic acid is present to the extent of 1 to 90 mol % as the sodium salt and to the extent of 0.1 to 10 mol % as the calcium or magnesium salt.
According to the invention, it is possible to convert the polycarboxylic acid partly into the corresponding calcium salts or magnesium salts or to add calcium or magnesium salts to it, possible anions being, in particular, sulphate, carbonate, phosphate or chloride.
In a particularly preferred embodiment, a self-metering washing machine is used. The polycarboxylic acid are the acids usually employed as builders, for example, polyacrylates, polymaleates and, in particular, the salts of polyaspartic acids. In a particularly preferred embodiment, salts of such a polyaspartic acid which is present to the extent of more than 50%, in particular to the extent of more than 60%, as .beta.-polyaspartic acid and has a molecular weight of >500, in particular of 1000 to 5000, measured by means of gel permeation chromatography in aqueous systems, are used.
The polyaspartic acid can be obtained here in the customary manner, for example starting from aspartic acid, and in particular starting by thermal condensation on the basis of maleic anhydride and ammonia, if appropriate via the intermediate stage of polysuccinimide, see EP-A-256,366 (=U.S. Pat. No. 4,839,461). These polyaspartic acids are used in preference to other polycarboxylic acids, since they have good washing properties as builders and cobuilders, are biologically degradable and surprisingly form water-soluble, non-crystallizing salts with calcium and/or magnesium ions (see above), and therefore do not precipitate out of liquid detergents.
The detergents to b
REFERENCES:
patent: 4839461 (1989-06-01), Boehmke
patent: 4971724 (1990-11-01), Kalota et al.
patent: 5116513 (1992-05-01), Koskan et al.
patent: 5389303 (1995-02-01), Wood et al.
patent: 5523023 (1996-06-01), Kleinstuck et al.
patent: 5531934 (1996-07-01), Freeman et al.
patent: 5540863 (1996-07-01), Wood et al.
patent: 5656646 (1997-08-01), Perner et al.
patent: 5756447 (1998-05-01), Hall
patent: 5770553 (1998-06-01), Kroner et al.
Hermann G. Hauthal, Moderne Washchmittel, Chemie in unserer Zeit, 26. Jahrg. 1992, Nr. 6, pp. 293-303.
G. Jakobi et al., Waschmittel chemie, Aktuelle Themen aus Forschung und Entwicklung, 1976, pp. 91-119.
Groth Torsten
Heise Klaus-Peter
Heuer Lutz
Joentgen Winfried
Wagner Paul
Bayer AG
Boyer Charles
Gupta Yogendra
LandOfFree
Washing process using polycarboxylic acid salts does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Washing process using polycarboxylic acid salts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Washing process using polycarboxylic acid salts will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2135450