Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2000-02-11
2002-07-16
Gupta, Yogendra N. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S180000, C510S163000, C510S179000
Reexamination Certificate
active
06420326
ABSTRACT:
FIELD OF INVENTION
This invention pertains to glass cleaning compositions, preferably clear liquid detergent compositions, for use in cleaning glass and hard surfaces and, preferably, other hard surfaces.
BACKGROUND OF THE INVENTION
There is a strong consumer preference for liquid cleaning compositions, especially compositions prepared for cleaning glass, that impart a smooth “gliding” feel, based on good surface lubricity, as the cleaning implement wipes and dries.
Because good filming/streaking properties are required especially for glass cleaners, the levels of surfactants and other actives must be kept low in order to achieve this benefit. It is highly desirable that the compositions be alkaline and have sufficient buffering capacity to provide cleaning and stability.
Also, it is known in the art that water-sheeting and anti-spotting benefits are preferred in glass cleaning compositions. These water-sheeting and anti-spotting benefits are typically achieved by providing a composition which leaves behind a hydrophilic residue.
Long chain, e.g., C
12
-C
14
or longer, alkyl sulfate detergent surfactants provide the desired amount of surface lubricity as the composition is wiped dry on glass as well as contributing detergency and providing acceptable filming/streaking results and product clarity. Furthermore, the long-chain alkyl sulfate surfactants are soluble in water and help to reinforce the surface hydrophilicity that is required in order to obtain water-sheeting and anti-spotting benefits.
SUMMARY OF THE INVENTION
The present invention relates to detergent compositions, preferably glass and surface cleaning compositions, that impart good surface lubricity and cleaning without leaving objectionable levels of filming and/or streaking. Preferably, said compositions contain an effective amount of substantive material which provides the glass with long lasting higher hydrophilicity and are in the form of an aqueous, liquid, hard surface detergent composition having improved cleaning and good spotting characteristics after rewetting, comprising:
(A) less than about 1%, by weight of the composition, of surfactant to provide lubricity, preferably a linear alkyl sulfate detergent surfactant having the general formula:
R—O—SO
3
M
wherein M is a suitable counter ion; R is an alkyl group having a chain length of from about C
8
to about C
18
or mixtures thereof; preferably wherein more than about 30%, of said surfactant, by weight, has a C
12
or C
14
chain length;
(B) from about 0.5% to about 30%, by weight of the composition, of a hydrophobic solvent having a hydrogen bonding parameter of from about 2 to 7.7;
(C) a low critical amount of alkaline buffering agent, preferably an alkanolamine, more preferably a beta-aminoalkanol, and most preferably, 2-amino-2-methyl-1-propanol to maintain the pH at from about 8.0 to about 11.0, preferably from about 8.5 to about 10.5, more preferably from about 9.0 to about 10.5, to provide buffering capacity equivalent to from about 0.010% to about 0.050%, preferably from about 0.015% to about 0.045%, more preferably from about 0.020% to about 0.040%, of 2-amino-2-methyl-1-propanol; and
(D) an optional but preferred, substantive material that increases the hydrophilicity of the glass; and
(E) the balance being an aqueous solvent system selected from the group consisting of water and non-aqueous polar solvents having a hydrogen bonding parameter of greater than 7.7; and
wherein said composition is essentially free of ingredients that cause spotting/filming.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to detergent compositions, preferably aqueous, liquid hard surface detergent compositions having excellent surface lubricity and filming/streaking characteristics, comprising:
(A) less than about 1%, by weight of the composition, of surfactant to provide lubricity, preferably a linear alkyl sulfate detergent surfactant having the general formula:
R—O—SO
3
M
wherein M is a suitable counter ion; R is an alkyl group having a chain length of from about C
8
to about C
18
or mixtures thereof, preferably wherein more than about 30%, of said surfactant, by weight, has a C
12
or C
14
chain length;
(B) from about 0.5% to about 30%, by weight of the composition, of a hydrophobic solvent having a hydrogen bonding parameter of from about 2 to 7.7;
(C) a low critical amount of alkaline buffering agent, preferably an alkanolamine, more preferably a beta-aminoalkanol, and most preferably, 2amino-2-methyl-1-propanol to maintain the pH at from about 8.0 to about 11.0, preferably from about 8.5 to about 10.5, more preferably from about 9.0 to about 10.5, to provide buffering capacity equivalent to from about 0.010% to about 0.050%, preferably from about 0.015% to about 0.045%, more preferably from about 0.020% to about 0.040%, of 2-amino-2-methyl-1-propanol; and
(D) an optional but preferred, substantive material that increases the hydrophilicity of the glass; and
(E) the balance being an aqueous solvent system selected from the group consisting of water and non-aqueous polar solvents having a hydrogen bonding parameter of greater than 7.7; and
wherein said composition is essentially free of ingredients that cause spotting/filming.
(A) The Surfactant
The aqueous, liquid hard surface detergent compositions herein contain less than about 1%, by weight of the composition, preferably from about 0.01% to about 1%, more preferably from about 0.02% to about 0.3%, by weight of the composition, of one or more surfactants that provide lubricity to the surface of the glass. Preferably, the surfactant comprises linear alcohol sulfate detergent surfactant having the general formula:
R—O—SO
3
M
wherein M is any suitable counterion, preferably sodium, potassium, etc.; and wherein R is an alkyl group with a chain length of from about C
8
to about C
18
and mixtures thereof, preferably from about C
10
to about C
18
and mixtures thereof, more preferably from about C
12
to about C
18
and mixtures thereof, and preferably wherein R is C
12
or C
14
in at least about 30%, preferably more than about 40%, more preferably more than about 50%, and most preferably more than about 60%, by weight of the alkyl sulfate. The entire alkyl sulfate surfactant can contain R of longer chain length(s), but more than 30%, by weight of the alkyl surfactant is preferably a C
12
or C
14
chain length. Compositions containing only alkyl sulfate surfactants with higher chain lengths, i.e., C
16-18
provide good surface lubricity benefits. However, these chain lengths, tend to exhibit poorer filming/streaking properties when used alone. On the other hand, compositions which are solely made up of lower-chain alkyl sulfate surfactants, i.e., C
8-10
alkyl sulfate surfactants, provide acceptable filming/streaking properties but tend to exhibit poorer surface lubricity properties. The presence of the C
12
or C
14
chain length at levels of more than about 15%, by weight of the alkyl sulfate surfactant, in combination with other chain lengths, or alone, can provide a product with both excellent surface lubricity properties and excellent filming/streaking properties. Particularly preferred compositions contain from about 0.05% to about 0.35%, by weight of the composition, of a C
12/14
blend in which the C
12
to C
14
weight ratio is from about 1.5:10 to about 2:1, preferably from about 1:5 to about 1.5:1, and more preferably from about 1:3 to about 1:1. This combination has been found to provide sufficient surface lubricity while avoiding objectionable filming/streaking. The alcohol sulfate detergent raw materials selected are essentially free from unreacted fatty alcohol wherein the term “essentially free” is defined as having less than about 2%, by weight of the composition, preferably less than about 1.8%, and more preferably less than about 1.5%, by weight of the composition of unreacted fatty alcohol in a nominally 30% active raw material. It is a special advantage of this invention that it improves the lubricity of most surfactants, including the optional surfactants d
Maile Michael Stephen
Sherry Alan Edward
Camp Jason C.
Gupta Yogendra N.
Petruncio John M
The Procter & Gamble & Company
Waugh Kevin L.
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