Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Enzyme component of specific activity or source
Reexamination Certificate
1999-10-08
2001-01-09
Fries, Kery (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Enzyme component of specific activity or source
C510S320000, C510S321000, C510S530000, C510S226000, C510S393000
Reexamination Certificate
active
06172030
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a detergent composition, and, more particularly, to a detergent composition having excellent detergency against muddy soil.
BACKGROUND ART
Soil adhering to clothes is generally classified into organic soil and inorganic soil. Muddy soil is a typical inorganic soil. Muddy soil very commonly adheres to, for example, socks, and has been known as one of the most difficult soils to remove. Surfactants and builders, which are active components of a detergent for clothes, have relatively weak effects against inorganic soil. Therefore, a variety of technologies have been developed to enhance wash-off effect against inorganic soil. However, most of them are applied technologies making use of conventional detergent bases and have respective drawbacks. For example, carboxylic acid-based polymers such as carboxymethyl cellulose or polyacrylate, having the effect of dispersing mud therein, are difficult to incorporate in a sufficient amount due to cost and bio-degradability. Use of reducing agents have also been proposed; however, it still has a problem upon incorporation because reducing agents may sometimes cause decoloration of dyed clothes.
Besides the application of the aforementioned conventional substances, there have been made attempts to use an enzyme to enhance washing effect against inorganic soil. Since an enzyme acts exclusively on a specific substrate, it exerts effects at a small amount of incorporation. Thus, an enzyme is an excellent detergent base and is expected to play more significant roles in detergent compositions. Japanese Patent Application Laid-Open (kokai) No. 59-49279 discloses that incorporation of cellulase into a detergent increases washing power against mud. Also, PCT Kohyo Publication No. 3-504080 discloses a certain cellulase which reduces harshness of cotton-containing fabrics and has effect of removing soil. Furthermore, WO95/25790 and Japanese Patent Publication (kokoku) No. 6-39596 disclose a detergent containing pectinase. Particularly, Japanese Patent Publication (kokoku) No. 6-39596 discloses that pectinase is effective against muddy soil. However, pectinase disclosed in these patent publications exhibits insufficient washing effect even when washing is conducted after presoaking at 40° C. for one hour.
In view of the foregoing, an object of the present invention is to provide a detergent composition having excellent detergency against muddy soil.
DISCLOSURE OF THE INVENTION
The present inventors have found that as compared to the case of conventional detergents, there can be obtained particularly excellent detergency against muddy soil through incorporation of protopectinase having an optimum pH for the reaction in the alkaline region, thus leading to completion of the present invention.
Accordingly, the present invention provides a detergent composition comprising protopectinase having an optimum reaction pH of 7.0 or higher when protopectin or polygalacturonic acid is used as a substrate.
REFERENCES:
patent: 3740315 (1973-06-01), Li et al.
patent: 3968048 (1976-07-01), Bolan
patent: 4481355 (1984-11-01), Jaskowski
patent: 5648263 (1997-07-01), Schulein et al.
patent: 3906124 (1990-08-01), None
patent: 4012351A1 (1991-10-01), None
patent: 195 09 406A1 (1996-09-01), None
patent: 0870834 (1998-10-01), None
patent: 59-49279 (1984-03-01), None
patent: 6-39596 (1994-05-01), None
patent: WO9525790 (1995-09-01), None
Hatada Yuji
Ito Susumu
Kasai Miyuki
Kobayashi Tohru
Koike Kenzo
Birch & Stewart Kolasch & Birch, LLP
Fries Kery
Kao Corporation
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