Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2000-02-22
2002-04-16
Boyer, Charles (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S220000, C510S221000, C510S224000, C510S227000, C510S228000, C510S466000, C510S514000
Reexamination Certificate
active
06372702
ABSTRACT:
FIELD OF THE INVENTION
This invention is directed to a dishwashing composition, and a method for improving starchy soil removal and preventing starch build-up on articles being cleaned. More particularly, the invention is directed to a superior dishwashing composition that has a silicon-comprising surfactant, a dialkyl ester of an alpha, omega-alkyl dicarboxylic acid surfactant wherein the alkyl chain of the dicarboxylic acid is functionalized with at least one hydrophilic group, or both. The dishwashing composition unexpectedly results in dishware that does display improved starchy soil removal and does not display starch build-up after multiple washing cycles.
BACKGROUND OF THE INVENTION
Traditional industrial and domestic dishwashing systems rely on a combination of high alkalinity detergent washes and chlorine bleach for cleaning and sanitizing dishware. Such systems perform well on bleachable stains; however, they tend to be deficient in removing starchy soils like those often found on dishware in domestic kitchens, hospitals, cafeterias, catering industries and the like.
Other attempts have been made to create dishwashing systems that are effective at handling starchy soils. These systems typically employ commercially available enzymes that break down the starchy soil in the various cycles of the dishwashing systems they are employed in. The enzymes used in systems for treating starchy soils on dishware are generally not limited and include those that typically break or hydrolyze the &agr;-1,4-glycosidic linkages of the starch backbone.
In addition to being sanitized, it is very desirable for dishware exiting dishwashing systems to be dry with a glossy finish. These characteristics are often achieved by employing a rinse aid composition in the final rinse step of the dishwashing system.
Unfortunately, however, it has been discovered that conventional rinse aid and detergent washes typically result in dishware with non-appealing characteristics. This is true because conventional detergent washes are not always effective at removing starchy soils from the dishware they are employed to clean. Also, studies indicate that conventional rinse aid compositions can result in poor starch removal on dishware subject to as little as one cleaning cycle.
It is of increasing interest to develop dishwashing compositions that maintain their conventional characteristics and do not adversely interfere with the cleaning process of a dishwashing system. Also, it is of increasing interest to develop methods that induce starchy soil removal and prevent starch build-up on articles, such as dishware, being cleaned. The inventions described herein, therefore, are directed to a superior dishwashing composition, and a method for improving starchy soil removal and preventing starch build-up on articles. Such inventions are achieved by employing a dishwashing composition that has a silicon-comprising surfactant, a dialkyl ester of an alpha, omega-alkyl dicarboxylic acid surfactant wherein the alkyl chain of the dicarboxylic acid is functionalized with at least one hydrophilic group, or both.
DESCRIPTION OF BACKGROUND REFERENCES
Methods have been disclosed for cleaning plasticware. In U.S. Pat. No. 5,603,776, plasticware is cleaned by subjecting the same to an alkaline aqueous cleaning agent and an aqueous rinse comprising nonionic surfactant, fluorinated hydrocarbon surfactant and polyalkylene oxide-modified polydimethylsiloxane.
Further, rinse aid compositions that comprise a modified polydimethylsiloxane have been disclosed. In U.S. Pat. No. 5,880,089, a rinse aid composition with a modified polydimethylsiloxane or a polybetaine-modified polysiloxane, a fluorinated hydrocarbon nonionic surfactant and a nonionic block copolymer of ethylene oxide and propylene oxide is disclosed.
Still further, in U.S. Pat. No. 5,880,088, rinse aid compositions that comprise a polyether or polybetaine polysiloxane copolymer, hydrotrope and nonionic block copolymer of ethylene oxide and propylene oxide are disclosed.
Also, in WO 98/30662, a detergent composition with a source of alkalinity and a blend of nonionic alkoxylated surfactant and nonionic alkoxylated silicone surfactant is described.
The prevention of, for example, starchy soil build-up, and starchy soil removal on articles being cleaned has not been addressed in the above described-references. The present inventions, therefore, are patentably distinguishable from the above-described since, among other reasons, they are directed to starchy soil removal and the prevention of starch build-up on articles being cleaned, particularly in a dishwashing system. Moreover, the present inventions display superior results without requiring the use of polybetaine modified polysiloxanes; fluorinated hydrocarbons; sorbitan fatty acid esters; nonionic, non-silicone comprising alkoxylated surfactants; and nonionic block copolymers of ethylene oxide and propylene oxide. Particularly, a nonionic surfactant with an ethylene oxide group is not required when the silicon comprising surfactant is nonionic.
SUMMARY OF THE INVENTION
In a first embodiment, the invention is directed to a dishwashing composition comprising:
at least one member selected from the group consisting of a silicon comprising surfactant and a dialkyl ester of an alpha, omega-alkyl dicarboxylic acid surfactant wherein the alkyl chain of the dicarboxylic acid is functionalized with at least one hydrophilic group, or both wherein the dishwashing composition prevents starch build-up and improves soil removal on articles being washed.
In a second embodiment, the invention is directed to a method for using the dishwashing composition described in the first embodiment of this invention.
In a third embodiment, the invention is directed to an optional pre-coating composition that enhances soil removal and prevents starch build-up on articles being cleaned, the pre-coating composition comprising at least one member selected from the group consisting of a silicon comprising surfactant and a dialkyl ester of an alpha, omega-alkyl dicarboxylic acid surfactant wherein the alkyl chain of the dicarboxylic acid is functionalized with at least one hydrophilic group.
As used herein, dishwashing composition is defined to mean a detergent wash or a rinse aid that may be used in a domestic or industrial dishwashing machine, the detergent wash or rinse aid being a block, tablet, powder, gel or liquid prior to being introduced to the dishwashing system. Also, the silicon comprising surfactant and the dialkyl ester of an alpha, omega-alkyl dicarboxylic acid surfactant that may be used in the dishwashing composition of this invention may herein be referred to as the soil removal surfactants.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
There generally is no limitation with respect to the silicon comprising surfactant and the dialkyl ester of an alpha, omega-alkyl dicarboxylic acid surfactant that may be used in this invention other than that the surfactants may be employed in a dishwashing composition.
Such silicon comprising surfactants are typically siloxanes. The preferred siloxane which may be used in this invention is one having the formula:
wherein each A is independently a hydrocarbon bridging group; each R is independently a C
1-10
alkyl, aryl, cationic group, anionic group, polyalkylene oxide; x is an integer from about 1 to about 250; and each m is 0 or 1, with the proviso that at least one R group is hydrophilic and when R is hydrophilic m is 1.
Typical cationic groups include ammonium, quaternary nitrogen, imidazoline and pyridinium compounds. Typical anionic groups include a sulfate, sulfonate and carboxylate.
The preferred alkyl used in this invention is a methyl, and the preferred polyalkylene oxide is an ethoxylate, propoxylate or copolymer prepared therefrom. The preferred hydrocarbon bridging groups that may be used in this invention include at least one having the formula:
wherein d is an integer from about 1 to about 10.
The molecular weight of the silicon comprising surfactants that may be used in this inve
Chiou Yu-Min Catherine
Jaynes Bingham Scott
Murphy Dennis Stephen
Rick Deborah Sue
Boyer Charles
Diversey Lever Inc.
Squillante, Jr. Edward A.
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