Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
1998-09-01
2001-05-29
Krynski, William (Department: 1774)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S319000, C510S384000, C510S423000, C510S473000, C510S488000
Reexamination Certificate
active
06239092
ABSTRACT:
The present invention relates to thickened cleaning and disinfecting compositions which are acidic in nature, and which exhibit good cleaning, disinfecting and long term stability.
While the prior art has provided various compositions directed to cleaning and disinfecting hard surfaces, particularly lavatory surfaces there is yet a continuing need in the art for thickened aqueous compositions which provide: satisfactory cleaning especially of limescale deposits from metal, enamel and porcelain surfaces as found on lavatory fixtures, disinfection of hard surfaces and good long term stability of the thickened compositions.
The present invention provides stable thickened aqueous acidic hard surface cleaning and disinfecting composition which comprises:
one or more nonionic surfactants, particularly linear primary alcohol ethoxylates;
one or more quaternary ammonium surfactant compounds having germicidal properties;
an acid mixture comprising formic acid and one or more water soluble organic acids, particularly water soluble organic acids selected from the group consisting of: lactic acid, glycolic acid and citric acid and particularly where the acid mixture include formic acid and at least one other water soluble organic acid wherein these acids are present in a weight ratio of formic acid:water soluble organic acids of 1:0.1-10;
a cellulose based thickening composition;
optionally but desirably a pH adjusting agent, fragrance, coloring agent;
and, water.
The aqueous acidic hard surface cleaning and disinfecting composition may further include minor amounts, i.e., less than a combined total amount of 10%wt., of conventional additives including but not limited to: colorants such as pigments and dyes; fragrances and perfumes, pH adjusting agents as well as other conventional additives. Most desirably, these compositions are effective against both gram positive and gram negative bacteria.
The present invention also provides a method for cleaning (especially the removal of limescale deposits) and disinfecting from metal, enamel and porcelain surfaces as found on lavatory fixtures.
The compositions include one or more nonionic surfactants. These are well known, and any of these are expected to be useful in the inventive compositions. Exemplary useful nonionic surfactants include condensation products of alkylene oxide groups with an organic hydrophobic compound, such as an aliphatic or alkyl aromatic compound. Further exemplary useful nonionic surfactants include the polyoxyethylene ethers of alkyl aromatic hydroxy compounds, e.g., alkylated polyoxyethylene phenols, polyoxyethylene ethers of long chain aliphatic alcohols, the polyoxyethylene ethers of hydrophobic propylene oxide polymers, and the higher alkyl amine oxides. Also contemplated as useful are ethoxylated alkyl phenols such as octylphenolethoxylates and nonylphenolethoxylates.
Preferred nonionic surfactants are ethoxylated alcohols. The compounds are well known and may be formed by condensation of an alcohol, or mixtures thereof, with sufficient ethylene oxide to produce a compound having a polyoxyethylene. Preferably the number of ethylene oxide units are present in an amount sufficient to insure solubility of the compound in an aqueous composition of this invention or in any dilution thereof. Desirably, the ethoxylated alcohols are produced by condensation of about 4-20, more preferably 6-18 moles of ethylene oxide with 1 mole of the linear primary aliphatic alcohol. The aliphatic alcohol may be linear or may be branched, and may be a primary, secondary or tertiary alcohol (including by way of non-limiting example: decyl alcohol, dodecyl alcohol, tridecyl alcohol, hexadecyl alcohol, octadecyl alcohol, and the like). As known to those skilled in the art, the number of moles of ethylene oxide which are condensed with one mole of aliphatic alcohol depends upon the molecular weight of the hydrophobic portion of the condensation product. The aliphatic alcohols are desirably a primary, secondary or tertiary aliphatic alcohol having about 10-20, and preferably 11-17, carbon atoms, and most preferably is an alcohol having 12-16 carbon atoms Especially preferably the nonionic surfactant of the present inventive compositions is the condensation product of linear or branched C
12
-C
16
aliphatic alcohols, especially C
12
-C
16
linear aliphatic alcohols or mixtures thereof, with sufficient ethylene oxide to provide an average of from 6-12 moles of ethylene oxide per molecule. Most preferably the nonionic surfactant constituent consists solely of linear or branched C
12
-C
16
aliphatic alcohols with 6-9 moles of ethylene oxide per molecule.
The nonionic surfactant is present in any effective amount, but generally is present in an amount of up to about 10% by weight, based on the total weight of the composition. Desirably the nonionic surfactant is present in an amount of from about 0.01%wt. to about 8%wt, and most desirably is present in an amount of from about 0.1%wt. to about 5%wt.
The compositions according to the invention include one or more quaternary ammonium surfactant compounds having germicidal properties; these compounds provide a sanitizing effect. Particularly useful quaternary ammonium compounds and salts thereof include quaternary ammonium germicides which may be characterized by the general structural formula:
where at least one of R
1
, R
2
, R
3
and R
4
is a hydrophobic, aliphatic, aryl aliphatic or aliphatic aryl radical of from 6 to 26 carbon atoms, and the entire cation portion of the molecule has a molecular weight of at least 165. The hydrophobic radicals may be long-chain alkyl, long-chain alkoxy aryl, long-chain alkyl aryl, halogen-substituted long-chain alkyl aryl, long-chain alkyl phenoxy alkyl, aryl alkyl, etc. The remaining radicals on the nitrogen atoms other than the hydrophobic radicals are substituents of a hydrocarbon structure usually containing a total of no more than 12 carbon atoms. The radicals R
1
, R
2
, R
3
and R
4
may be straight chained or may be branched, but are preferably straight chained, and may include one or more amide or ester linkages. The radical X may be any salt-forming anionic radical.
Exemplary quaternary ammonium salts within the above description include the alkyl ammonium halides such as cetyl trimethyl ammonium bromide, alkyl aryl ammonium halides such as octadecyl dimethyl benzyl ammonium bromide, N-alkyl pyridinium halides such as N-cetyl pyridinium bromide, and the like. Other suitable types of quaternary ammonium salts include those in which the molecule contains either amide or ester linkages such as octyl phenoxy ethoxy ethyl dimethyl benzyl ammonium chloride, N-(laurylcocoaminoformylmethyl)-pyridinium chloride, and the like. Other very effective types of quaternary ammonium compounds which are useful as germicides include those in which the hydrophobic radical is characterized by a substituted aromatic nucleus as in the case of lauryloxyphenyltrimethyl ammonium chloride, cetylaminophenyltrimethyl ammonium methosulfate, dodecylphenyltrimethyl ammonium methosulfate, dodecylbenzyltrimethyl ammonium chloride, chlorinated dodecylbenzyltrimethyl ammonium chloride, and the like.
Preferred quaternary ammonium compounds which act as germicides and which are found useful in the practice of the present invention include those which have the structural formula:
wherein R
2
and R
3
are the same or different C
1
-C
12
alkyl, or R
2
is C
12-16
alkyl, C
8-18
alkylethoxy, C
8-18
alkylphenolethoxy and R
3
is benzyl, and X is a halide, for example chloride, bromide or iodide, or is a methosulfate counterion. The alkyl groups recited in R
2
and R
3
may be straight chained or branched, but are preferably substantially linear.
Particularly useful quaternary germicides include compositions which include a single quaternary, as well as mixtures of two or more different quaternary. Particularly useful quaternary germicides include BARDAC® 205M, and BARDAC® 208M or BTC® 885which is described to be a blend of alkyl dimethyl benzyl ammonium chlorides; BARDAC® 2050 and BARDAC® 20
Cavanagh James William
Fellows Robert Terrence
Love Michael David
Papasso Thomas Michael
Fish & Richardson P.C.
Garrett Dawn L.
Krynski William
Reckitt Benckiser , Inc.
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