Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1997-01-28
1998-12-22
McAvoy, Ellen M.
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510348, 510349, 510392, 510530, C11D 3386
Patent
active
058519750
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an enzyme-containing granulated substance useful as a formulation ingredient for detergents, and particularly to an enzyme-containing granulated substance excellent in enzyme stability, free of dusting characteristics and good in productivity.
BACKGROUND ART
Various kinds of enzymes are often incorporated in laundry detergents and bleaching agents in addition to surfactants and bleaching ingredients with a view toward enhancing detergent action. These enzymes are generally granulated in the form of granules before their incorporation with a view toward preventing deactivation during their storage and causing them to sufficiently exhibit their activities in a washing process.
Such enzyme-containing granulated substances are known to lower the stability of the enzyme when they are blended with bleaching agents, surfactants, builders and the like, and to markedly reduce the activity of the enzyme when blending with, in particular, the bleaching agents. In granulated substances for detergents, taking into consideration the lowering of productivity due to classification, and the like, it is necessary that their particle diameters, bulk specific gravities and the like should be controlled at a certain measure of option. In particular, there is a demand for development of a granulated substance narrow in particle size distribution and high in productivity. Since operators upon preparation and consumers need to avoid direct contact with the enzyme, there is also a demand for development of a granulated substance free of dusting characteristics.
In order to solve these problems, the present inventors previously found that when an agitating and rolling granulator is used, an enzyme-containing granulated substance narrow in particle size distribution can be obtained with high productivity, and filed an application for patent (JP-A-62-257990(1987)).
However, even the granulated substance obtained by this rolling granulator was not yet fully satisfactory from the viewpoint of storage stability of the enzyme contained therein, dusting characteristics and the like. That is, the relationship between the storage stability of an enzyme contained in granulated substances and their dusting characteristics, and the compositions of the granulated substances is important.
Accordingly, it is an object of the present invention to provide an enzyme-containing granulated substance free of dusting characteristics and good in storage stability of the enzyme contained therein and productivity, a preparation process thereof and a detergent composition comprising this substance.
DISCLOSURE OF THE INVENTION
This object has been achieved by the surprising finding that when a particulate substance containing an enzyme is used as a nucleus and coated with two or more kinds of water-insoluble or hardly water-soluble inorganic particles and a binder in combination, a granulated substance scarcely having dusting characteristics and having far excellent storage stability can be obtained.
According to the present invention, there is thus provided an enzyme-containing granulated substance comprising an enzyme-containing particulate substance and a coating layer which is formed on the particulate substance and comprises (a) water-insoluble or hardly water-soluble inorganic particles having an average particle diameter of 1 to 100 .mu.m, (b) water-insoluble or hardly water-soluble inorganic particles having an average particle diameter of 0.01 to 0.8 .mu.m and (c) a binder.
According to the present invention, there is also provided a process for the preparation of an enzyme-containing granulated substance, comprising forming, on an enzyme-containing particulate substance, a coating layer comprising (a) water-insoluble or hardly water-soluble comprising (a) water-insoluble or hardly water-soluble inorganic particles having an average particle diameter of 1 to 100 .mu.m, (b) water-insoluble or hardly water-soluble inorganic particles having an average particle diameter of 0.01 to 0.8 .mu.m and (c
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Chemical Abstract 105: 228951h Composite enzyme granules for laundry detergents. Onoda et al., 1986.
Chemical Abstract 105: 228952j Liquid detergent compositions. Maurai et al., 1986.
Chemical Abstract 105: 228953k Water-based laundry detergent. Daurov et al., 1986.
Japanese Abstract JP61107935 Enzyme granule and its coloration. Masayuki et al., May 1986.
Kawamura Jyo
Kiuchi Toshihiro
Sano Kohtaro
Sato Manabu
Yamada Naoto
Kao Corporation
McAvoy Ellen M.
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