Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Specific organic component
Reexamination Certificate
2000-10-30
2003-03-04
Hardee, John (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Specific organic component
C510S475000, C510S235000
Reexamination Certificate
active
06528476
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to liquid detergent compositions suitable for hand dishwashing comprising one or more block polymeric suds volume and suds duration enhancers. The block polymeric suds enhancers (suds boosters) suitable for use in the compositions of the present invention comprise one or more cationic block units and optionally one or more additional building blocks such as hydroxyl- containing units, hydrophobic group-containing units, hydrophilic group-containing units, anionic units, other cationic units, hydrogen-bonding units and zwitterionic units. The present invention further relates to methods for providing enhanced suds volume and suds duration during hand washing.
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 use 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 block polymeric materials having the capacity to accommodate a positive charge character, negative charge character, or zwitterionic character have the capacity to provide liquid hand wash detergent compositions with extended suds volume and suds duration benefits.
In one aspect of the present invention, liquid detergent compositions having increased suds volume and suds retention suitable for use in hand dishwashing, said compositions comprising:
a) an effective amount of a block polymeric suds stabilizer (suds booster), said stabilizer comprising:
i) one or more cationic group-containing units; and
ii) optionally one or more additional building block units defined hereinafter;
b) an effective amount of a detersive surfactant; and
c) the balance carriers and other adjunct ingredients.
provided that a 10% aqueous solution of said detergent composition has a pH of from about 4 to about 12.
In still another aspect of the present invention, methods for providing increased suds retention and suds volume when hand washing dishware using the block polymeric materials of the present invention is provided.
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.
Additional background on these compositions and methods is provided by PCT Patent Application Serial Nos. PCT/US98/24853, PCT/US98/24707, PCT/US98/24699 and/or PCT/US98/24852 all incorporated herein by reference in their entirety.
All substituent groups in structural formulas in the Specification and Claims have the meaning defined in previous structural formulas in the Specification or Claims, respectively, unless indicated otherwise.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to block polymeric materials which provide enhanced suds duration and enhanced suds volume when formulated into liquid detergent compositions suitable for hand dishwashing.
The block polymeric materials of the present invention have an average cationic charge density of about 15 or less, preferably 5 or less, more preferably from about 0.05 to about 5, even more preferably from about 0.05 to about 2.77, even more preferably from about 0.1 to about 2.75, most preferably from about 0.75 to about 2.25 units per 100 daltons molecular weight at a pH of from about 4 to about 12.
Block Polymers
“Block Polymers” as used herein is meant to encompass two or more different homopolymeric and/or monomeric units which are linked to form a single polymer molecule. Typically, the block polymers are in the form of di-, tri- and multi-block polymers. Those skilled in the art will recognize the phrase “block copolymers” is synonymous with this definition of “block polymers”.
“Building Blocks” herein is meant homopolymeric units and/or monomeric units that polymerize with one another to form block copolymers. Nonlimiting examples of suitable building blocks in accordance with the present invention are cationic units, hydrogen-bonding units, hydrophilic units, hydrophobic units, anionic units and zwitterionic units. For the purposes of the present invention, the block polymer of the present invention comprises one or more cationic homopolymeric and/or monomeric units.
The different homopolymeric units present in block polymers retain some of their respective individual, original properties even though they are linked to one or more different homopolymeric units. Block polymers are known to exhibit properties that are different from those of homopolymers, random copolymers, and polymer blends but the properties of block copolymers themselves differ, depending on the length and chemical composition of the blocks making up the block polymer. Accordingly, the properties of a block polymer are influenced by the arrangement of the blocks within the block polymer. For example, a block polymer such as:
hydrophobic block-hydrophilic block-hydrophobic block-cationic block will exhibit properties that are different than a block polymer such as:
hydrophilic block-hydrophobic block-hydrophilic block-cationic block.
Likewise, a block polymer such as:
hydrophilic-hydrophilic-hydrophilic-hydrophilic-hydrophobic-hydrophilic-cationic will exhibit properties that are different than a block polymer such as:
cationic-hydrophilic-hydrophobic-hydrophilic.
Block Polymer Structures
The block polymers of the present invention comprise at least one cationic homopolymeric and/or monomeric unit, preferably 2-(dimethylaminoethyl) methacrylate (DMAM) and one or more non-cationic homopolymeric and/or monomeric units, such as acrylic acid (AA), methacrylic acid (MA), hydroxyethylacrylate (HEA), hydroxypropylac
Bergeron Vance
Bodet Jean-Francois
Kluesener Bernard William
Scheper William Michael
Sivik Mark Robert
Cook C. B.
Hardee John
Miller Steven W.
The Procter & Gamble & Company
Zerby Kim W.
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