Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2001-02-13
2002-05-07
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...
C510S237000, C510S356000, C510S382000, C510S384000, C510S391000, C510S470000, C510S490000, C510S503000, C510S504000
Reexamination Certificate
active
06384004
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a composition to be used for manual dishwashing and that is capable of killing germs on hard surfaces to a much greater extent than typical manual dishwashing products in the market.
BACKGROUND OF THE INVENTION
Typical manual dishwashing compositions are based on anionic surfactants. These compositions foam generously and are effective at cleaning kitchen soils, especially greasy soil. However, these products cannot be considered disinfectants, because they do not pass stringent disinfectancy tests such as the AOAC use-dilution test.
Disinfectant compositions containing cationic surfactants and nonionic surfactants are well known, but they do not have the foam needed for a manual dishwashing detergent. These products also do not remove triglyceride soils effectively. Often, after the compositions are rinsed, the direct surfaces exhibits streaks and spots.
Combinations of anionic surfactants and cationic, antimicrobial surfactants are possible but this combination reduces the foam, creates instability problems and deactivates the disinfectant behavior of the cationic surfactant.
It has now been found that a unique formula comprising cationic, nonionic, and zwitterionic surfactants can overcome these deficiencies and provide good foam, good grease and soil removal, as well as providing good rinsing together with a high level of disinfectancy.
SUMMARY OF THE INVENTION
The present invention relates to compositions comprising approximately by weight:
from 0.1 to 10% of at least one disinfecting agent such as cationic surfactant;
from 10% to 20% of at least one nonionic surfactant;
from 0 to 2%, more preferably 0.1% to 1.5% of an ethoxylated alkanolamide;
from 0 to 5% of a zwitterionic surfactant;
15% to 24% of an amine oxide surfactant;
0 to 5% of an alkyl polyglucoside surfactant; and
the balance being water.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a stable cleaning composition comprising approximately by weight:
0.1% to 10% of at least one disinfecting agent such as a cationic surfactant,
10% to 20% of at least one nonionic surfactant;
0 to 2%, more preferably 0.1% to 1.5% of an ethoxylated alkanol amide;
0 to 5% of a zwitterionic surfactant,
15% to 24% of an amine oxide surfactant;
0 to 5% of an alkyl polyglucoside surfactant; and
the balance being water, wherein the composition does not contain inorganic or organic builder salts, anionic surfactants, biguanide compounds, amino acid germicides, glucamide surfactant, mono- or di-alkanol amides which are not ethoxylated, inorganic polymeric thickeners, fatty acid monoglycerides, organic acids, 1-(4-chlorophenoxyl)-1-imidazol-1-yl-3,3dimethyl butan-2-one or an anionic brightener such as tetrasodium 4,4′-bis ((4-[bis(2-hydroxyethyl)amino]-6-(p-sulfoanilino))-1,3, 4-triazin-2-yl)amino)-2,2′-stilbene disulfonate.
The cationic surfactant constitutes about 0.1 to 10% by weight, preferably 1% to 8% by weight of the composition. It is depicted by the formula:
wherein R
1
is a C
8
-C
18
alkyl group and X is selected from the group C
8
-C
12
and a benzyl group or ethyl benzyl group. Y
−
is a halide. Especially preferred cationic surfactants are BTC 835 and BTC 888, manufactured by the Stepan Company. BTC 835 is a C
12
-C
16
alkyl dimethyl benzyl ammonium chloride. BTC 888 is a mixture of approximately 32 wt. % of alkyl dimethyl benzyl ammonium chloride (alkyl=C
14
-C
16
), approximately 24 wt. % octyl decyl dimethyl ammonium chloride, approximately 12 wt. % dioctyl dimethyl ammonium chloride and about 12 wt. % didecyl ammonium chloride and the balance being water. Mixtures of the above cationic surfactants are also useful.
The water soluble nonionic surfactants which are utilized in this invention at a concentration of 10 to 20 wt. %, more preferably 12 to 18 wt. % are commercially well known and include the primary aliphatic alcohol ethoxylates, secondary aliphatic alcohol ethoxylates, alkylphenol ethoxylates and ethylene-oxide-propylene oxide condensates on primary alkanols, such as Plurafacs™ (BASF), and condensates of ethylene oxide with sorbitan fatty acid esters, such as the Tweens™ (ICI). The nonionic synthetic organic surfactants generally are the condensation products of an organic aliphatic or alkyl aromatic hydrophobic compound and hydrophilic ethylene oxide groups. Practically any hydrophobic compound having a carboxy, hydroxy, amido, or amino group with a free hydrogen attached to the nitrogen can be condensed with ethylene oxide or with the polyhydration product thereof, polyethylene glycol, to form a water-soluble nonionic detergent. Further, the length of the polyethenoxy chain can be adjusted to achieve the desired balance between the hydrophobic and hydrophilic elements.
The nonionic surfactant class includes the condensation products of a higher alcohol (e.g., an alkanol containing about 8 to 18 carbon atoms in a straight or branched chain configuration) condensed with about 5 to 30 moles of ethylene oxide, for example, lauryl or myristyl alcohol condensed with about 16 moles of ethylene oxide (EO), tridecanol condensed with about 6 to moles of EO, myristyl alcohol condensed with about 10 moles of EO per mole of myristyl alcohol, the condensation product of EO with a cut of coconut fatty alcohol containing a mixture of fatty alcohols with alkyl chains varying from 10 to about 14 carbon atoms in length and wherein the condensate contains either about 6 moles of EO per mole of total alcohol or about 9 moles of EO per mole of alcohol and tallow alcohol ethoxylates containing 6 EO to 11 EO per mole of alcohol.
A preferred group of the foregoing nonionic surfactants are the Neodol™ ethoxylates (Shell Co.), which are higher aliphatic, primary alcohols containing about 9-15 carbon atoms, such as C
9
-C
12-13
alkanol condensed with 2.5 to 10 moles of ethylene oxide (Neodol™ 91-2.5 or -5 or -6 or -8), C
12-13
alkanol condensed with 6.5 moles ethylene oxide (Neodol™ 23-6.5), C
12-15
alkanol condensed with 12 moles ethylene oxide (Neodol™ 25-12), C
14-15
alkanol condensed with 13 moles ethylene oxide (Neodol™ 45-13), and the like.
Additional satisfactory water soluble alcohol ethylene oxide condensates are the condensation products of a secondary aliphatic alcohol containing 8 to 18 carbon atoms in a straight or branched chain configuration condensed with 5 to 30 moles of ethylene oxide. Examples of commercially available nonionic detergents of the foregoing type are C
11
-C
15
secondary alkanol condensed with either 9 EO (Tergitol™ 15-S-9) or 12 EO (Tergitol™ 15-S-12), marketed by Union Carbide.
Other suitable nonionic surfactants include the polyethylene oxide condensates of one mole of alkyl phenol containing from about 8 to 18 carbon atoms in a straight- or branched chain alkyl group with about 5 to 30 moles of ethylene oxide. Specific examples of alkyl phenol ethoxylates include nonyl phenol condensed with about 9.5 moles of EO per mole of nonyl phenol, dinonyl phenol condensed with about 12 moles of EO per mole of phenol, dinonyl phenol condensed with about 15 moles of EO per mole of phenol and di-isoctylphenol condensed with about 15 moles of EO per mole of phenol. Commercially available nonionic surfactants of this type include Igepal™ CO-630 (nonyl phenol ethoxylate) marketed by GAF Corporation.
Also among the satisfactory nonionic surfactants are the water-soluble condensation products of a C
8
-C
20
alkanol with a mixture of ethylene oxide and propylene oxide wherein the weight ratio of ethylene oxide to propylene oxide is from 2.5:1 to 4:1, preferably 2.8:1 to 3.3:1, with the total of the ethylene oxide and propylene oxide (including the terminal ethanol or propanol group) being from 60-85%, preferably 70-80%, by weight. Such surfactants are commercially available from BASF-Wyandotte. A particularly preferred detergent is a C
10
-C
16
alkanol condensate with ethylene oxide and propylene oxide, the weight ratio of ethylene oxide to propylene oxide being 3:1 and the total alkoxy content being abo
Frank Brian
McCandlish Elizabeth
Boyer Charles
Colgate-Palmolive Co.
Nanfelo Richard E.
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