Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1997-05-05
1999-03-02
Lieberman, Paul
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510362, 510421, 510427, 510434, 510488, 510499, 510506, C11D 1825, C11D 308
Patent
active
058771352
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a liquid cleanser with thixotrope properties which contains a surface-active agent and an organic acid along with usual cleanser additives in aqueous solution, and to its use as a liquid sanitary cleaning agent, in particular for cleaning toilets, washbowls, shower cabinets, shower tubs and swimming pools as well as kitchen sinks.
Conventional acidic liquid toilet cleaning agents contain along with surface-active agents substantially organic acids (e.g. formic acid, acetic acid or citric acid) or inorganic acids (e.g. phosphoric acid or hydrochloric acid) and polysaccharides as thickening agents as well as usual further additives such as stabilizers, dyes and scents.
Known acidic liquid toilet cleaning agents are effective for example in removing lime and urine deposits as well as in destroying bacteria and bad smells which form predominantly on the lime and urine deposits.
The most frequently used relatively strong acids, such as hydrochloric acid, phosphoric acid and formic acid, belong to water danger class 1. Phosphoric acid furthermore has a eutrophic effect. Hydrochloric acid and formic acid are considered strong irritants for the eyes, respiratory tract and mucous membranes so that liquid toilet cleansers containing these acids can already be recognized by their keen and sharp smell. The stated strong acids are furthermore very difficult to perfume. Inorganic acids and formic acid therefore involve a potential danger because of their corrosive effect and should not be used for household cleaning agents if possible.
The thickening agents contained in known toilet cleaning agents are intended to increase the viscosity of the cleaning agent and ensure that the acidic cleaning solution can act as long as possible on the vertical surfaces of a toilet bowl.
However, the viscosity of a toilet cleanser cannot be increased at will, the lime solvent power decreasing with increasing viscosity as a result of diffusion problems of its lime-dissolving components on the toilet surface to be treated, and problems furthermore occurring with respect to the distribution of the cleanser, which becomes more difficult with increasing viscosity. This limits the exposure time and the exposure concentration of the lime-dissolving components of the toilet cleansers and thus their cleaning power, in particular their lime solvent power (LSP).
The problem of the invention was therefore to develop an improved liquid cleanser which has a higher cleaning power, in particular improved lime solvent power, while using weaker, less polluting acids without the abovementioned problems occurring.
It was found that this problem can be solved by considerably improving the adhesion of a sufficiently thick cleaning film to the surface to be cleaned by using pyrogenic silicic acid, which in combination with certain organic acids and surface-active agents gives the liquid cleaning agent thixotrope properties.
It was surprisingly found in particular that thixotropic acidic aqueous cleaning solutions (containing organic carboxylic acids) with clearly higher lime solvent power can be obtained with various surface-active agents, based on the same active content, and pyrogenic silicic acid.
The subject-matter of the invention is a liquid cleanser with thixotrope properties which contains a surface-active agent and an organic acid along with usual cleanser additives in aqueous solution, characterized in that it contains as a surface-active agent one or more compounds selected from the group of alkylamidobetaines, alkylaminobetaines, alkylbetaines, alkyl polyglycol ether carboxylic acids and/or fatty alcohol ethoxylates in mixture with pyrogenic silicic acid and at least one organic acid selected from the group of citric acid, lactic acid, tartaric acid, maleic acid, malic acid, glutaric acid, adipic acid, acetic acid and formic acid.
The surface-active agents to be used according to the invention are ones whose alkyl group or fatty acid group is a saturated or unsaturated alkyl group with 10 to 18, preferable 12 to 14, carb
REFERENCES:
patent: 5460742 (1995-10-01), Cavanash et al.
Database WPI, Sec. Ch, Week 8832, Derwent Pub. Ltd., JP 63 161 095, Jul. 4, 1988.
Database WPI, Sec. Ch, Week 7732, Derwent Pub. Ltd., JP 52 077 111, Jun. 29, 1977.
Database WPI, Sec. Ch, Week 8724, Derwent Pub. Ltd., JP 62 096 599, May 6, 1987.
Database WPI, Sec. Ch, Week 8832, Derwent Pub. Ltd., JP 63 161 091, Jul. 4, 1988.
Lieberman Paul
Webb Gregory E.
Yankee Polish Luth GmbH & Co.
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