Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Specific organic component
Patent
1999-02-23
2000-12-26
Gupta, Yogendra
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Specific organic component
510223, 510229, 510230, 510318, 510361, 510398, 510434, 510476, 510533, C11D 330, C11D 337
Patent
active
061659703
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to detergent compositions, useful in a cleaning method, containing in combination, a low molecular weight polymer containing acrylic acid and an amino tricarboxylic acid chelant, exhibiting improved soil and stain removal.
BACKGROUND OF THE INVENTION
Detergent compositions designed for use in cleaning, particularly automatic dishwashing and laundry methods are well known, and a consistent effort has been made by detergent manufact urers to improve the cleaning and/or rinsing efficiency of said compositions as reflected by numerous patent publications.
The general problem of the formation of deposits as spots and films on the articles in the wash, and on the dishwasher and washing machine parts is well known in the art.
Whilst the general problem of deposit formation is known, a full understanding of the many facets of the problem is however still an active area of research.
A range of deposit types can be encountered. The redeposition of soils or the breakdown products thereof, which have previously been removed from the soiled tableware in the washload, provides one deposit type. Insoluble salts such as calcium carbonate, calcium fatty acid salts (lime soaps), or certain silicate salts are other common deposit types. Composite deposit types are also common. Indeed, once an initial minor deposit forms it can act as a "seeding centre" for the build up of a larger, possibly composite, deposit structure.
Deposit formation can occur on a range of commonly encountered substrate surfaces including a range of fabric types, plastic, glass, metal and china surfaces. Certain deposit types however, show a greater propensity to deposit on certain substrates. For example, lime soap deposit formation tends to be a particular problem on plastic substrates, and silicate deposit formation tends to occur on glassware.
The formation of insoluble carbonate, especially calcium carbonate, deposits is a particular problem. There is a general appreciation in the art, as represented for example by EP-A-364,067 in the name of Clorox, CH-A-673,033 in the name of Cosmina, and EP-A-551,670 in the name of Unilever, that calcium carbonate deposit formation is a particular problem when non-phosphate containing detergent formulations are employed. In general, this can be explained by the slightly inferior builder capacity of the typically employed non-phosphate builder systems in comparison to phosphate builder formulations. The problem of calcium carbonate deposit formation is understood to be especially apparent when these formulations contain a carbonate builder component, as for example is essential to the compositions taught by EP-A-364,067.
The Applicants have now found that the problem of CaCO.sub.3 deposit formation can exist even in the absence of a carbonate builder component in the machine dishwashing and laundry detergent formulations, and especially when that formulation contains no phosphate builder component. The naturally sourced, inlet water to washing machines can be a sufficient source of Ca.sup.2+ and Mg.sup.2+ ions and HCO.sub.3- /CO.sub.3.sup.2- ions to make deposit formation a problem. Whilst the salt softening system, through which the inlet water will pass prior to entry into the main cavity of the dishwasher machine, can be efficient at removing the naturally present Ca.sup.2+ and Mg.sup.2+ ions it is inefficient at removing the HCO.sub.3- /CO.sub.3.sup.2- ions which therefore enter into the wash/rinse solution.
The Applicants have now established that both the levels of Ca.sup.2+ /Mg.sup.2+ hardness ions and the levels of HCO.sub.3- /CO.sub.3.sup.2- ions in the wash/rinse water of the dishwasher machine are factors controlling calcium carbonate deposit formation. Critical levels of both components must be exceeded for carbonate-related deposit formation to occur. These critical levels are to an extent interdependent. Thus, even in wash solutions containing high levels of one component deposit formation will not occur in the absence of the critical level of the ot
REFERENCES:
patent: 3627686 (1971-12-01), Sabatelli et al.
patent: 3708436 (1973-01-01), Thompson et al.
patent: 4698174 (1987-10-01), Denzinger et al.
patent: 5597789 (1997-01-01), Sadlowski
patent: 5750483 (1998-05-01), Welch et al.
patent: 5759978 (1998-06-01), Welch et al.
patent: 5783524 (1998-07-01), Greindl et al.
Chemical Abstract HCAPLUS file accession No. 1981:409124, for JP 55-160099, May 1979.
Chemical Abstract HCAPLUS file accession No. 1981:409123, for JP 55-157695, Dec. 1980.
"New biodegradable complexing agents, Relations between structure and degradability", by Potthoff-Karl Birgitt, in SOFW J. (1994), 120(2/3), 104, 106-9--see enclosed translation.
Kitko David Jonathan
Murata Susumu
Tsunetsugu Shuichi
Tsunetsugu Toshiko
Williams (nee Mac Beath) Fiona Susan
Bolam Brian M.
Boyer Charles
Echler Richard S.
Gupta Yogendra
Hasse Donald E.
LandOfFree
Detergent composition comprising acrylic acid-based polymer and does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Detergent composition comprising acrylic acid-based polymer and , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detergent composition comprising acrylic acid-based polymer and will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-994851