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
2003-02-25
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...
C510S337000, C510S338000, C510S340000, C510S393000, C510S499000, C510S504000, C564S281000, C564S290000, C564S295000
Reexamination Certificate
active
06525012
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to nil bleach liquid laundry detergent compositions which provide enhanced hydrophilic soil, inter alia, clay, removal benefits. The laundry detergent compositions of the present invention combine zwitterionic polyamines, a polyalkyleneimine dispersant, and a surfactant system which comprises mid-chain branched surfactants inter alia mid-chain branched alkyl sulphates and provides hydrophobic soil removal in the absence of a bleaching system. The present invention further relates to methods for cleaning fabric having heavy clay soil deposits.
BACKGROUND OF THE INVENTION
Fabric, especially clothing, can become soiled with a variety of foreign substances ranging from hydrophobic stains (grease, oil) to hydrophilic stains (clay). The level of cleaning which is necessary to remove said foreign substances depends to a large degree upon the amount of stain present and the degree to which the foreign substance has contacted the fabric fibers. Grass stains usually involve direct abrasive contact with vegetative matter thereby producing highly penetrating stains. Clay soil stains, although in some instances contacting the fabric fibers with less force, nevertheless provide a different type of soil removal problem due to the high degree of charge associated with the clay itself. This high surface charge density may act to repel some laundry adjunct ingredients, inter alia, clay dispersants, thereby resisting any appreciable removing or carrying away of the clay into the laundry liquor.
A surfactant per se is not all that is necessary to remove unwanted clay soils and stains. In fact, not all surfactants work equally well on all types of stains. In addition to surfactants, polyamine hydrophilic soil dispersants are added to laundry detergent compositions to “carry away” clay soils from the fabric surface and to reduce or lower the possibility that the clay soil will be re-deposited upon the fabric. However, unless the clay can be initially removed from the fabric fiber, especially in the case of hydrophilic fibers, inter alia, cotton, there will be nothing in solution for the added dispersants to remove. Therefore, there is a long felt need for a detergent system which will ensure that the soils will be removed from fabric so that the surfactants and dispersants can effectively remove the soils and prevent redeposition.
There is a long felt need in the art for liquid laundry detergent compositions which can effectively remove embedded clay and other hydrophilic soils from fabric. The desired laundry detergent compositions will effectively remove the embedded soils and prevent the soils from being re-deposited onto the fabric surface.
SUMMARY OF THE INVENTION
The present invention meets the aforementioned needs in that it has been surprisingly discovered that certain zwitterionic polyamines in combination with one or more polyamine dispersants provides enhanced removal of clay and other hydrophilic soils from fabric.
The first aspect of the present invention relates to a liquid laundry detergent composition comprising:
a) from about 0.01%, preferably from about 0.05%, more preferably from 0.1% to about 20%, preferably to about 10%, more preferably to about 3% by weight, of a zwitterionic polymer 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 an anionic moiety is less than or equal to the number of quaternized backbone amino units;
b) from about 0.1%, preferably from about 0.5%, more preferably from about 1% to about 7%, preferably to about 5%, more preferably to about 3% by weight, of a polyamine dispersant;
c) from about 0.01%, preferably from about 0.1% more preferably from about 1% to about 100%, preferably to about 80% by weight, preferably to about 60%, most preferably to about 30% by weight, of a surfactant system comprising one or more surfactants selected from the group consisting of nonionic, anionic, cationic, zwitterionic, ampholytic surfactants, and mixtures thereof; and
d) the balance carriers and adjunct ingredients.
A further aspect of the present invention relates to compositions which comprise:
a) from about 0.01%, preferably from about 0.05%, more preferably from 0.1% to about 20%, preferably to about 10%, more preferably to about 3% by weight, of a zwitterionic polyamine according to the present invention;
b) from about 0.1%, preferably from about 0.5%, more preferably from about 1% to about 7%, preferably to about 5%, more preferably to about 3% by weight, of a polyamine dispersant;
c) from about 0.01%, preferably from about 0.1% more preferably from about 1% to about 100%, preferably to about 80% by weight, preferably to about 60%, most preferably to about 30% by weight, of a surfactant system comprising:
i) from 0.01% by weight, of a mid-chain branched alkyl sulfate surfactant, a mid-chain branched alkyl alkoxy sulfate surfactant, and mixtures thereof;
ii) from 0.01% by weight, of a surfactant selected from the group consisting of anionic, nonionic, and mixtures thereof;
c) from about 0.001% by weight, of a detersive enzyme, said enzyme selected from the group consisting of protease, amylases, lipases, cellulases, peroxidases, hydrolases, cutinases, mannanases, xyloglucanases, and mixtures thereof; and
d) the balance carriers and adjunct ingredients.
The present invention also relates to a method for removing hydrophilic stains from fabric by contacting fabric in need of cleaning with a composition according to the present invention.
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 the surprising discovery that the combination of a zwitterionic polyamine and an ethoxylate polyamine dispersant provides enhanced benefits for removal of clay soil from fabric, especially clothing, in a liquid laundry detergent matrix. In addition, the present invention relates to a zwitterionic polymer/polyamine dispersant system which is compatible with one or more enzymes.
It has been surprisingly discovered that the formulator, by selecting the relative degree of quaternization of the polyamine backbone, the type and relative degree of incorporation of anionic units which substitute the polyamine backbone, and the nature of the amine backbone itself, is able to form a zwitterionic polymer which can be tailored for optimization depending upon the desired execution. Preferably, as described herein below, the zwitterionic polymers which are incorporated into liquid laundry detergent compositions have an excess number of quaternized backbone nitrogens relative to the number of anionic units which are present.
For the purposes of the present invention the term “charge ratio”, Q
r
, is defined herein as “the quotient derived from dividing the sum of the number of anionic units present excluding counter ions by the sum of the number of quaternary ammonium backbone units”. The charge ratio is defined by the expression:
Q
r
=
∑
q
anionic
∑
q
cationic
wherein q
anionic
is an anionic unit, inter alia, —SO
3
M, as defined herein below and q
cationic
represents a quaternized backbone nitrogen.
Those of skill in the art will realize that the greater the number of amine units which comprise the polyamine backbones of the present invention the greater the number of potential cationic units will be contained therein. For the purposes of the present invention the term “degree of quaternization” is defined herein as “the number
Meyer Axel
Price Kenneth Nathan
Delcotto Gregory
Matthews Armina E.
Miller Steven W.
The Procter & Gamble & Company
William Zerby Kim
LandOfFree
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