Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2000-09-25
2002-04-09
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...
C510S422000, C510S423000, C510S424000, C510S427000, C510S433000, C510S491000, C510S494000
Reexamination Certificate
active
06369012
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to polymers, mixtures thereof suitable for use as suds volume and suds duration enhancers in detergent compositions useful for hand washing of dishware and cookware. The present invention also relates to polymers having sufficient cationic charge at a pH of from about 4 to about 12 to be effective as suds volume and suds duration enhancers.
BACKGROUND OF THE INVENTION
Liquid detergent compositions which are suitable for hand dishwashing must satisfy several criteria in order to be effective. These compositions must be effective in cutting grease and greasy food material and once removed, must keep the greasy material from re-depositing on the dishware.
The presence of suds in a hand dishwashing operation has long been used as a signal that the detergent continues to be effective. However, depending upon the circumstances, the presence of suds or the lack thereof, has no bearing upon the efficacy of liquid detergents. Therefore, the consumer has come to rely upon a somewhat erroneous signal, the lack or absence of soap suds, to indicate the need for additional detergent. In many instances the consumer is adding an additional amount of detergent far in excess of the amount necessary to thoroughly clean the dishes. This wasteful use of detergent is especially true in hand dishwashing since the soiled cooking articles are usually cleaned in a “washing difficulty” queue, for example, glasses and cups, which usually do not contact greasy food, are washed first, followed by plates and flatware, and finally pots and pans which contain the most residual food material and are usually, therefore, the “greasiest”.
The lack of suds in the dishwater when pots and pans are usually cleaned, together with the visual inspection of the amount of residual food material on the cookware surface, typically compels the consumer to add additional detergent when a sufficient amount still remains in solution to effectively remove the soil and grease from the dishware or cookware surface. However, effective grease cutting materials do not necessarily produce a substantial amount of corresponding suds.
Accordingly, there remains a need in the art for liquid dishwashing detergents useful for hand washing dishware which have an enduring suds level while maintaining effective grease cutting properties. The need exists for a composition which can maintain a high level of suds as long as the dishwashing composition is effective. Indeed, there is a long felt need to provide a hand dishwashing composition which can be used efficiently by the consumer such that the consumer uses only the necessary amount of detergent to fully accomplish the cleaning task.
SUMMARY OF THE INVENTION
The present invention meets the aforementioned needs in that it has been surprisingly discovered that certain polymers serve as suds duration and suds volume extenders. The effective polymers of the present invention provide both increased suds volume and suds duration when formulated in a liquid detergent having a pH range of from about 4 to about 12 when measured as a 10% aqueous solution.
A first aspect of the present invention relates to detergent compositions suitable for use in hand dishwashing, said composition comprising:
a) an effective amount of a polymeric suds stabilizer comprising at least one monomeric unit of the formula:
wherein each of R
1
, R
2
and R
3
are indently selected from the group consisting of hydrogen, C
1
to C
6
alkyl, and mixtures thereof; L is selected from the group consisting of a bond, O, NR
6
, SR
7
R
8
and mixtures thereof, wherein R
6
is selected from the group consisting of hydrogen, C
1
to C
8
alkyl and mixtures thereof; each of R
7
and R
8
are independently hydrogen, O, C
1
to C
8
alkyl and mixtures thereof, or SR
7
R
8
form a heterocyclic ring containing from 4 to 7 carbon atoms, optionally containing additional hetero atoms and optionally substituted; Z is selected from the group consisting of: —(CH
2
)—, (CH
2
—CH═CH)—, —(CH
2
—CHOH)—, (CH
2
—CHNR
6
)—, —(CH
2
—CHR
14
—O)— and mixtures thereof; wherein R
14
is selected from the group consisting of hydrogen, C
1
to C
6
alkyl and mixtures thereof; z is an integer selected from about 0 to about 12; A is NR
4
R
5
, wherein each of R
4
and R
5
are independently selected from the group consisting of hydrogen, C
1
-C
8
linear or branched alkyl, alkyleneoxy having the formula:
—(R
10
O)
y
R
11
wherein R
10
is C
2
-C
4
linear or branched alkylene, and mixtures thereof; R
11
is hydrogen, C
1
-C
4
alkyl, and mixtures thereof; y is from 1 to about 10;, or NR
4
R
5
form an heterocyclic ring containing from 4 to 7 carbon atoms, optionally containing additional hetero atoms, optionally fused to a benzene ring, and optionally substituted by C
1
to C
8
hydrocarbyl; and wherein said polymeric suds stabilizer has a molecular weight of from about 1,000 to about 2,000,000 daltons;
b) an effective amount of a detersive surfactant; and
c) the balance carriers and other adjunct ingredients;
provided the pH of a 10% aqueous solution of said composition is from about 4 to about 12.
The present invention also relates to methods for providing increased suds and increased duration of suds while hand washing dishware comprising the step of dissolving a composition according to the present invention in water to form a hand dish-washing solution and then washing dishware by hand in said solution. These and other aspects, 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 polymers which provide increased suds volume and increase suds duration during hand washing of dishware. The present invention also relates to liquid detergent compositions comprising polymers which provide extended suds volume and suds duration without sacrificing the grease cutting ability of said liquid detergent compositions.
In addition, the polymers of the present invention act together with surfactants and other adjunct ingredients, especially diamines, to provide for efficient grease cutting and anti-redepositon of grease.
Polymeric Suds Stabilizers
The polymeric suds stabilizers of the present invention are polymers comprising at least one monomeric unit of the formula:
wherein each of R
1
, R
2
and R
3
are independently selected from the group consisting of hydrogen, C
1
to C
6
alkyl, and mixtures thereof, preferably hydrogen, C
1
to C
3
alkyl, more preferably, hydrogen or methyl. L is selected from the group consisting of a bond, O, NR
6
, SR
7
R
8
and mixtures thereof, preferably, O, NR
6
, wherein R
6
is selected from the group consisting of hydrogen, C
1
to C
8
alkyl and mixtures thereof, preferably, hydrogen, C
1
to C
3
, and mixtures thereof, more preferably hydrogen, methyl; each of R
7
and R
8
are independently hydrogen, O, C
1
to C
8
alkyl and mixtures thereof, preferably, hydrogen, C
1
to C
3
, and mixtures thereof, more preferably hydrogen or methyl. By “O”, an oxygen linked via a double bond is meant, such as a carbonyl group. Furthermore this means that when either or both R
7
R
8
is “O”, SR
7
R
8
can have the following structures:
Alternatively, SR
7
R
8
form a heterocyclic ring containing from 4 to 7 carbon atoms, optionally containing additional hetero atoms and optionally substituted. For example SR
7
R
8
can be:
However, it is preferred that SR
7
R
8
, when present, is not a heterocycle.
When L is a bond it means that there is a direct link, or a bond, between the carbonyl carbon atom to Z, when z is not zero. For example:
When L is a bond and z is zero, it means L is a bond from the carbonyl atom to A. For example:
Z is selected from the group con
Kasturi Chandrika
Kluesener Bernard William
Schafer Michael Gayle
Scheper William Michael
Sivik Mark Robert
DelCotto Gregory
Robinson Ian S.
The Procter & Gamble & Company
Zerby Kim W.
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