Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1998-09-09
2000-09-05
Gupta, Yogendra
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510349, 510352, 510438, C11D 1700
Patent
active
061142972
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a detergent composition for clothes washing, and a process for washing clothes using the detergent composition. More specifically, the present invention relates to a detergent composition for clothes washing exhibiting excellent detergency with a small amount of dosage, and a process for washing clothes using the detergent composition.
BACKGROUND ART
Moreover, to date, various kinds of chelating agents, ion exchange materials, alkalizing agents, and dispersants have been known to be used for builders to be blended in detergents. Particularly, the phosphoric acid-based chelating agents such as tripolyphosphates as a main component thereof have good water solubility and detergency, so that they have been formulated as main detergent builder components.
In recent years, however, the use of tripolyphosphates has been decreased, since they can cause eutrophication in closed water areas such as lakes and marshes. Instead, crystalline aluminosilicates (zeolites) have been commonly used as substitutes for the metal ion capturing agent, as typically disclosed in Japanese Patent Laid-Open No. 50-12381, of which the disclosure is incorporated herein by reference. Such detergents formulating zeolites as mentioned above would require a standard amount of dosage of 40 g per one washing cycle, the washing cycle being most commonly using about 30 L of the washing liquid per one cycle in Japan. Also, the powder detergents available at that time had a low bulk density at a level of 0.20 to 0.45 g/ml owing to the solubility in cold water. As a result, the standard volumetric amount is made as high as about 90 to about 200 ml of detergents per 30 L of water for washing, so that much inconveniences were caused in handling during distribution, and in shops and households.
Therefore, an intense investigation has been made to produce compact detergents. For instance, Japanese Patent Laid-Open Nos. 62-167396, 62-167399, and 62-253699, of which the disclosure is incorporated herein by reference, disclose a remarkable decrease in the amount of crystalline inorganic salts such as sodium sulfate used as powdering aids conventionally contained in detergents. In addition, Japanese Patent Laid-Open Nos. 61-69897, 61-69899, 61-69900, and 5-209200, of which the disclosure is incorporated herein by reference, disclose that an increase in the bulk density of the detergents. By these findings, detergents having a bulk density of from 0.60 to 1.00 g/ml, whose standard amount of dosage is from 25 to 30 g/30 L, can be produced, thereby resulting in making the detergents compact to a level of a standard volumetric amount of from 25 to 50 ml/30 L.
However, in conventional detergents, a large amount of surfactants had to be blended in the detergent compositions because mainstream of the technical idea was to make the oily components in dirt soluble by surfactants. Specifically, sebum dirt stains ascribed to human bodies, the most typical dirt stains adhered to clothes (most likely to be observed on collars and sleeves), are taken as examples. The sebum dirt stains contain oily components, such as free fatty acids and glycerides, with a high content of 70% or more (Ichiro KASHIWA et al., "Yukagaku," 19, 1095 (1969), of which the content is incorporated herein by reference). The oily components lock carbon and dirt in dust and peeled keratin, so that the resulting substance is observed as dirt stain composites. In order to wash off the sebum dirt stains, conventionally detergents are designed based on a washing mechanism mainly by making these oily components soluble with micelle of surfactants, thereby detaching carbon, dirt, and keratin from clothes. This technical idea has been widely established among those of ordinary skill in the art, and even when the conventional detergents are shifted to compact detergents, substantially no changes took place in the surfactant concentration in the washing liquid. This fact is described in "Dictionary for Detergents and Washing," Haruhiko OKUYAMA et al., p.
REFERENCES:
patent: 5482642 (1996-01-01), Agar et al.
patent: 5540855 (1996-07-01), Baillely et al.
patent: 5583098 (1996-12-01), Boskamp et al.
Tanimoto Hitoshi
Tsumadori Masaki
Yamaguchi Shu
Gupta Yogendra
Kao Corporation
Webb Gregory E.
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