Bleaching and dyeing; fluid treatment and chemical modification – Cleaning or laundering – Removing formation impurities from artifical fiber
Patent
1997-03-11
1999-10-05
Diamond, Alan
Bleaching and dyeing; fluid treatment and chemical modification
Cleaning or laundering
Removing formation impurities from artifical fiber
510356, 510361, 510376, 510348, 510532, 510533, C11D 308, C11D 312
Patent
active
059616628
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a washing method and a phosphorus-free clothes detergent composition. More specifically, the present invention relates to a washing method capable of having excellent washing power with a low surfactant concentration in the washing liquid and a small dosage, and a clothes detergent composition capable of achieving given washing conditions with a small amount of dosage thereof.
BACKGROUND ART
Various kinds of chelating agents, ion exchange materials, alkalizers, and dispersants have been known to be used for builders to be blended in detergents. Since the phosphate-based chelating agents having tripolyphosphates as a main component thereof have good water solubility and washing power, they are preferred.
In recent years, the use of tripolyphosphates has decreased, since they can cause eutrophication in closed freshwater areas such as lakes and marshes. Instead, crystalline aluminosilicates (zeolites), typically those disclosed in Japanese Patent Laid-Open No. 50-12381, have been commonly used. In a detergent blend using the above zeolite, the standard amount of dosage for the detergent in Japan is generally about 40 g/30 L. Also, the powdery detergents available at that time had low bulk density of from 0.20 to 0.45 g/ml from the viewpoint of solubility in cold water. As a result, the standard volumetric amount of dosage was about from 90 to 200 ml/30 L, which were extremely inconvenient for handling in distribution, at stores and homes.
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 disclose remarkable decrease in the amount of crystalline inorganic salts such as sodium sulfate used as powdery aids conventionally contained in detergents. In addition, Japanese Patent Laid-Open Nos. 61-69897, 61-69899, 61-69900, and 5-209200 disclose that by increasing the bulk density of the detergents, to thereby have a bulk density of from 0.60 to 1.00 g/ml, only a standard amount of dosage of 25 to 30 g/30 L is required, thereby making the detergents compact to have standard volumetric amount of dosage 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 the mainstream idea was to make the oily components in dirt soluble by surfactants. Specifically, sebum dirt originated by human bodies, which is the most typical dirt adhered to clothes, most likely to be observed on collars and sleeves, is an example. The sebum dirt contains oily components, such as free fatty acids and glycerides, with a high content of not less than 70% (Ichiro KASHIWA et al., "Yukagaku," 19, 1095 (1969)). The oily components lock carbon and dirt in dust and peeled keratin, so that the resulting substance is observed as dirt. In order to wash off the sebum dirt, 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. 428, 1990, First Edition, Asakura Publishing Company Limited, which shows that there are substantially no changes in concentrations in the washing liquid for components other than sodium sulfate.
Based on these washing principles, the surfactant concentration in the washing liquid has to be made high in order to achieve high washing power, so that a large amount of surfactants has to be blended in the detergent composition. Therefore, a drastic reduction in the standard amount of dosage of the detergents was actually difficult. In addition, the presently known production method substantia
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Ishikura Akiko
Kasai Katsuhiko
Tsumadori Masaki
Ushio Noriaki
Yamaguchi Shu
Diamond Alan
Kao Corporation
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