Compositions – Water-softening or purifying or scale-inhibiting agents
Patent
1993-07-15
1995-08-22
Wax, Robert A.
Compositions
Water-softening or purifying or scale-inhibiting agents
435209, 435691, 4352523, 435265, 536 232, 935 14, 935 68, C11D 3386, C12N 942, C12N 1556, C12N 1580
Patent
active
054437504
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to detergent compositions comprising a high activity cellulase in combination with a softening clay. In the detergent compositions herein, the cellulase comprises a cellulase of high activity defined by the C14CMC-method. Preferably the detergent composition comprises a softening clay together with a clay flocculating agent and in case of liquid composition an anti-settling agent for the clay.
The present invention relates to detergent compositions comprising a high activity cellulase in combination with a softening clay. In the
BACKGROUND OF THE INVENTION
The need for detergent compositions which exhibit not only good cleaning properties, but also good fabric-softening performance, and other fabric care benefits, is well-established in the art.
The efficiency of cellulolytic enzymes, i.e. cellulases, in terms of textile cleaning and harshness-reducing agent for fabrics has been recognized for some time; GB-A-2,075,028, GB-A-2,095,275 and GB-A-2,094,826, disclose detergent compositions with cellulase for improved cleaning performance; GB-A-1,368,599 discloses the use of cellulase for reducing the harshness of cotton-containing fabrics; U.S. Pat. No. 4,435,307 teaches the use of a cellulolytic enzyme derived from Humicola insolens as well as a fraction thereof, designated ACXI, as a harshness-reducing detergent additive.
EP-A-0 269 168 discloses optimized detergent compositions containing cellulase, which are formulated at a mild alkaline pH range and provide combined fabric cleaning, fabric softening, and fabric care performance.
In WO 89109259 have been disclosed cellulase preparations useful for reducing the harshness of cotton-containing fabrics, comprising an endoglucanase component with a high endoase activity and affinity towards cellulose.
The practical exploitation of cellulases has however, been set back by the fact that cellulase preparations such as those disclosed in the above-mentioned prior art documents, are complex mixtures, of which only a certain fraction is effective in the fabric-care context; it was thus difficult to implement cost effective industrial production of cellulase for the detergent industry; and large quantities of such cellulase preparations would need to be applied, in order to obtain the desired effect on fabrics.
Improvements in cellulase production also often have not proven to be sufficiently identifiable in terms of applicability in detergents. Defining a cellulase selection criterium relevant for detergent application of cellulase was made possible by the C14CMC-method disclosed in EP-A-350 098. A minimum of 10% removal of immobilized radioactive labelled carboxymethyl-cellulose has now been found to provide high activity cellulase. A preferred group of cellulase falling under the high activity definition according to the present invention has been disclosed in copending Danish Patent Application No.: 1159/90 filed May 5, 1990. There is amongst others disclosed a cellulase preparation consisting essentially of a homogeneous endoglucanase component which is immunoreactive with a monoclonal antibody raised against a partially purified about 43 kD cellulase derived from Humicola insolens DM1800.
The finding that this particular endoglucanase component of cellulase is advantageous for the treatment of cellulose-containing materials now permits to produce the cellulase cost-effectively, e.g. by employing recombinant DNA techniques, and allows to apply only a small quantity of the cellulase preparation, and obtain the desired effect on fabrics.
EP-A-381 397 discloses the effect of low ionic-strength on enzyme performance, in particular for lipase. However, it has been surprisingly found, that the effect of a compact matrix on the selected enzymes of the present invention is much larger than what could be expected from state of the art cellulases such as disclosed in EP-A-381 397.
In EP-A-177 165 the use of softening clay together with cellulase in detergent compositions has been disclosed. The invention of this disclosure
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Baeck Andre C.
Busch Alfred
Convents Andre
Moore William W.
Patel Ken K.
Rasser Jacobus C.
The Procter & Gamble & Company
Wax Robert A.
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