Detergent particles comprising metal-containing bleach catalysts

Details Detergent particles comprising metal-containing bleach catalysts Detergent particles comprising metal-containing bleach catalysts

1998-08-07

2000-07-25

Delcotto, Gregory R.

Compositions

Oxidative bleachant, oxidant containing, or generative

Composition containing a stabilizer or a product in the form...

510311, 510349, 510376, 510441, 510445, 510446, 510508, C11D 3395, C11D 754

Patent

active

060933437

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to bleach catalyst-containing particles, and to the preparation of these bleach catalyst-containing particles. These particles are particularly useful components of detergent compositions, such as laundry detergent compositions, hard surface cleaners, and especially automatic dishwashing detergent compositions.


BACKGROUND OF THE INVENTION

The use of certain bleach catalysts, particularly those comprising cobalt or manganese compounds, in detergent compositions has been previously suggested. A preferred way of incorporating such bleach catalyst components is in small particulate form. However, the direct incorporation of small bleach catalyst particles at typically very low levels into particulate detergent compositions can present problems. Such compositions typically, should be made up of particles having mean sizes which are all similar to each other in order to avoid segregation of components in the composition. Such compositions also often comprise particles having mean particles size in a defined range of from about 400 to about 2400 microns, more usually from about 500 to about 2000 microns, to achieve good flow and absence of dustiness properties. Any fine or oversize particles outside these limits must generally be removed by sieving to avoid a particle segregation problem. Fine bleach catalyst particles in a detergent composition matrix may also cause chemical stability problems caused by a tendency of the fine particles to interact with other components of the overall composition, such as other bleach components.
It has now been found that the above described problems may be surprisingly ameliorated by incorporating the bleach catalyst as composite particles in the form of micro-encapsulates which have a size distribution smaller to that of the other components of the particulate detergent composition, and which allow delivery of the bleach catalyst particle into the wash solution.


SUMMARY OF THE INVENTION

The present invention relates to bleach catalyst containing composite particles suitable for incorporation into particulate detergent compositions, said composite particles comprising by weight of the particles


DETAILED DESCRIPTION OF THE INVENTION

The compositions according to the present invention comprise discrete particles of bleach catalyst and an encapsulating material. These particles may optionally contain other components, such as stabilizing additives and/or diluents. Each of these materials, the steps in the composite particle preparation process, the particles so prepared and particulate detergents containing these particles are described in detail hereinafter.
The present composite particles comprise metal-containing bleach catalysts. Preferred are manganese and cobalt-containing bleach catalysts.
One type of metal-containing bleach catalyst is a catalyst system comprising a transition metal cation of defined bleach catalytic activity, such as copper, iron, titanium, ruthenium tungsten, molybdenum, or manganese cations, an auxiliary metal cation having little or no bleach catalytic activity, such as zinc or aluminum cations, and a sequestrate having defined stability constants for the catalytic and auxiliary metal cations, particularly ethylenediaminetetraacetic acid, (methylenephosphonic acid) and water-soluble salts thereof. Such catalysts are disclosed in U.S. Pat. No. 4,430,243.
Other types of bleach catalysts include the manganese-based complexes disclosed in U.S. Pat. No. 5,246,621 and U.S. Pat. No. 5,244,594. Preferred examples of these catalysts include Mn.sup.IV.sub.2 (u-O).sub.3 (1,4,7-trimethyl-1,4,7-triazacyclononane).sub.2 -(PF.sub.6).sub.2 ("MnTACN"), Mn.sup.III.sub.2 (u-O).sub.1 (u-OAc).sub.2 (1,4,7-trimethyl-1,4,7-triazacyclononane).sub.2 -(ClO.sub.4).sub.2, Mn.sup.IV.sub.4 (u-O).sub.6 (1,4,7-triazacyclononane).sub.4 -(ClO.sub.4).sub.2, Mn.sup.III Mn.sup.IV.sub.4 (u-O).sub.1 (u-OAc).sub.2 -(1,4,7-trimethyl-1,4,7-triazacyclononane).sub.2 -(ClO.sub.4).sub.3, and mixtures thereof. See also European patent applicat

REFERENCES:
patent: 4536183 (1985-08-01), Namnath
patent: 5114611 (1992-05-01), Van Kralingen et al.
patent: 5244594 (1993-09-01), Favre et al.
patent: 5441660 (1995-08-01), Tsaur et al.
patent: 5703034 (1997-12-01), Offshack et al.
patent: 5902781 (1999-05-01), Painter

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