Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2001-02-21
2002-10-29
Delcotto, Gregory (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S338000, C510S340000, C510S351000, C510S356000, C510S357000, C510S360000, C510S373000, C510S504000, C510S530000, C562S107000
Reexamination Certificate
active
06472359
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to laundry detergent compositions which prevent the re-deposition of soil onto fabric which has been entrained into cellulosic material derived form fabric or other source. The surprising results are obtained from the combination of a zwitterionic polyamine and an enzyme system which comprises a xyloglucanase enzyme, preferably a xyloglucanase enzyme and a mannanase enzyme.
BACKGROUND OF THE INVENTION
Enzymes are now routinely comprise laundry detergent compositions. The variability of stains and soils is now effectively matched with one or more correspondingly effective enzymes. Proteinaceous stains are removed by protease enzymes while cellulase enzymes are used to obliterate and remove cellulosic material based stains and soils.
Regardless of how effective enzymes are at breaking up specific soils and providing a means for the removal of said stains from fabric, enzymes themselves can not serve to abate the re-deposition of soils back onto fabric itself. Enzymes which are effective at cutting the chemical bonds of the primary cell wall of cellulosic fabric are able to release entrapped soils for removal by surfactants. However, much of the xyloglucan comprising primary cell wall of cellulose comprising fibers is damaged due to mechanical wear either outside the laundry process or during laundering itself. The broken fiber material is finally loosened and removed during the mechanical wash, however this material can attract loosened soils and dirt, form an amorphous material which then re-deposits onto fabric.
There is a long felt need for a laundry detergent which is capable of breaking down loosened cellulosic material which entraps and re-deposits soil onto fabric. There is also a long felt need for an enzyme system which will maintain cellulosic fabric in a manner which abates the entrapping and embedding of soils which can be acted upon by other enzymes, inter alia, protease enzymes.
SUMMARY OF THE INVENTION
The present invention meets the aforementioned needs in that it has been surprisingly discovered that liquid laundry detergent compositions comprising a combination of xyloglucanase enzymes and one or more zwitterionic polyamines produces enhance soil removal properties. It has also been surprisingly discovered that a preferred enzyme system according to the present invention comprises a mixture xyloglucanase and mannanase enzymes, preferably in combination with one or more other detersive enzymes. It has also been surprisingly discovered that the formulator may selected the final pH of said compositions from about pH 7.2 to about pH 9.
The first aspect of the present invention relates to liquid laundry detergent compositions which comprise:
a) from about 0.01%, preferably from about 0.1%, more preferably from about 0.5%, most preferably form about 1% to about 10%, preferably to about 5%, more preferably to about 3%, most preferably to about 2% by weight, of a zwitterionic polyamine which comprises a polyamine backbone, said backbone comprising two or more amino units wherein at least one of said amino units is quaternized and wherein at least one amino unit is substituted by one or more moieties capable of having an anionic charge wherein further the number of amino unit substitutions which comprise said anionic moiety is less than or equal to the number of quaternized backbone amino units;
b) from about 0.00005%, preferably form about 0.0001% to about 0.005%, preferably to about 0.001% by weight, of a xyloglucanase enzyme;
c) from about 0.5% to about 50% by weight, of a surfactant system comprising:
i) from about 10% to about 99% by weight, of said surfactant system, of a nonionic surfactant;
ii) from about 1% to about 90% by weight, of said surfactant system, of an anionic surfactant;
iii) optionally, from 1% to about 50% by weight, of said surfactant system, of a detersive surfactant selected from the group consisting of cationic surfactants, zwitterionic surfactants, ampholytic surfactants, and mixtures thereof, and
d) the balance carriers and adjunct ingredients.
The present invention also relates to enzyme systems comprising:
i) from about 20% to about 99% by weight, of a said enzyme system, a xyloglucanase enzyme;
ii) from about 1% to about 80% by weight, of said enzyme system, a mannanase enzyme;
iii) optionally, from 1% to 80% by weight, of said enzyme system one or more enzymes selected from the group consisting of protease enzymes, amylase enzymes, cellulase enzymes, lipolase enzymes, lipase enzymes, peroxidase enzymes, cutinase enzymes, and mixtures thereof.
The present invention further relates to a method for treating fabric with an aqueous solution of a xyloglucanase enzyme containing liquid laundry detergent composition wherein the aqueous concentration of said xyloglucanase is from about 0.5 ppm to about 50 ppm, wherein said composition further comprises one or more zwitterionic polyamines.
These and other objects, features and advantages will become apparent to those of ordinary skill in the art from a reading of the following detailed description and the appended claims. All percentages, ratios and proportions herein are by weight, unless otherwise specified. All temperatures are in degrees Celsius (°C.) unless otherwise specified. All documents cited are in relevant part, incorporated herein by reference.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to liquid laundry detergent compositions which have enhanced soil removal benefits. The combination of a xyloglucanase enzyme with a zwitterionic polyamine dispersant provides soil removal from cellulosic fabric and improved soil anti-redeposition properties. The present invention prevents the entrapment of soils into residues which can be re-deposited onto fabric.
Without wishing to be limited by theory, cellulosic fabric comprises fibers wherein xylogluncan is a primary cell wall constituent. The primary cell wall (outer layer of fiber) is damaged due to abrasion from wear the fabric and is also damaged by the enzymes which comprise detergent compositions, inter alia, cellulases. The xyloglucan cellular material which comprises a piece of cellulosic fabric may become loosened or detached due to these circumstances and during the laundering process several pejorative consequences to fabric cleaning can result. In one case the loosened and detachable xyloglucan is lifted from the surface of fabric. This amorphous, glue-like material is usually large enough in molecular weight that is not easily solublized or dispersed, but instead, is present along the fabric surface where it can entrain loosened or removed soil. Once the amorphous xyloglucan containing material is contaminated with soil, it has a propensity to re-deposit onto the surface of fabric thereby producing an entrapped area of soil.
Alternatively, long strings of xyloglucan polymer can become semi-detached from the cellulosic fabric primary cell wall and this glue-like material in turn can entrap soils which have been removed from the fabric surface. In addition, other enzymes which are present, protease enzymes, inter alia, may produce fragments of foreign stain material which, instead of being carried away by the laundry liquor, become immediately imbedded within the amorphous xyloglucan strands.
It has now been surprisingly discovered that the presence of xyloglucanase enzyme together with a fabric surface active zwitterionic polyamine inhibits the entrapment of soils and stain material by xyloglucan cell wall fragments. During the laundry process, xyloglucanase enzymes cut the xyloglucan fragments completely free of the cellulosic primary cell wall thereby providing a virtually renewed fiber surface. In addition, the xyloglucanase enzymes react with the amorphous, glue-like material and produce a water soluble or dispersible material which is incapable of re-depositing onto fabric or incapable of entrapping soil or stain material.
It has also been surprisingly discovered that in some instances liquid laundry detergent compositions which comprise an enzyme syste
Delcotto Gregory
Echler Sr. Richard S.
Zerby Kim W.
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