Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
1996-04-02
2004-05-25
Qazi, Sabiha (Department: 1616)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S108000, C510S110000, C510S122000, C524S837000, C524S858000
Reexamination Certificate
active
06740626
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an acidic cleaning formulation containing a surface modification agent selected from the group consisting of a hydrolyzed trialkoxysilane and a hydrolyzable quaternary silane. The formulation is applied to hard surfaces to clean the surface and provide a uniform silane coating on the cleaned surface. The invention also relates to a method for applying the acidic cleaning formulation of this invention to hard surfaces covered by water.
2. Related Background Art
It is known to apply silane cleaning solutions to surfaces to impart water repellency and provide a protective barrier on the treated surface. For example, U.S. Pat. No. 4,948,531 discloses an aqueous cleaning composition comprising (a) one or two nonionic surfactants and an amphoteric surfactant as cleaning agents, (b) lecithin and an aminofunctional polydimethylsiloxane copolymer as protective barrier components, (c) one or two glycols as solvency and grease cutting agents, and (d) water. The disclosed aminofunctional polydimethylsiloxane copolymer has the formula:
and is available as Dow Corning 531 Fluid (Dow Corning Corporation, Midland, Mich.) which is a 50% solution in aliphatic solvents and isopropyl alcohol. This composition is said to clean a surface and simultaneously leave a protective barrier on the cleaned surface.
U.S. Pat. No. 4,005,030 describes a detergent composition containing an organosilane and an anionic surfactant. The organosilane is said to attach to the hard surfaces to which the detergent composition is applied. U.S. Pat. No. 4,005,025 describes a similar detergent composition containing an organosilane, a water-soluble surfactant and a source of alkalinity. This patent also discloses that the composition preferably contains an amine oxide. However, the composition is said to be unstable when the pH of the composition is not alkaline.
U.S. Pat. No. 4,859,359 is directed to a hard surface cleaning and polishing composition comprising a solvent mixture of a glycol ether, a lower aliphatic alcohol, a hydrocarbon solvent and a minor amount of water together with an organic polysiloxane, a silane and a polycarboxylic chelating acid. The silane compound, which is said to promote the solubility of the other silicone compounds in the mixture, is represented by the formula:
R
3
—Si(OR4)
3
wherein R
3
is an alkyl radical containing one to three carbon atoms or phenyl and R
4
is an alkyl radical containing one or two carbon atoms. The alkyl trialkoxysilanes are disclosed as preferable.
U.S. Pat. No. 5,073,195 is directed to an aqueous solution of a water silane coupling agent, preferably an amino functional silane coupling agent, and an alkyltrialkoxysilane such as methyltrimethoxysilane or isobutyltrimethoxysilane. The composition is used to treat a surface to impart water repellency to that surface.
Alkoxysilanes are known to hydrolyze upon exposure to water to form reactive silanol groups. The silanol group may then condense with a reactive site on a treated surface. However, if the silanol group is available during storage it may self-condense with other silanol groups to form an insoluble polymer. Hydrolysis of silanes in aqueous medium may be avoided by buffering the emulsions to a specific pH range such as disclosed in U.S. Pat. No. 4,877,654. This patent describes a buffered aqueous silane emulsion containing a hydrolyzable silane that is hydrolytically stable within a determined pH range, an emulsifier having an HLB value of from 1.5 to about 20, a buffering compound and water. However, a buffered composition restricted to a certain pH range can be particularly limiting to a formulator of cleaning compositions.
PCT International Publication No. WO 92/14810 discloses that certain organosilanes containing hydrolyzable groups, especially quaternary ammonium functional organosilanes, can form clear solutions in aqueous media which are stable over extended periods of time by including a water soluble organic, non-silicon quaternary ammonium compound along with nonionic, amphoteric, sarcosine anionic or certain cationic surfactants. The stabilization of hydrolyzable quaternary silanes in the absence of a non-silicon quaternary ammonium compound is not disclosed or suggested. Moreover, the use of hydrolyzed organosilanes is not exemplified.
PCT International Publication No. WO 95/23804 is directed to a hydrolyzed silane obtained by emulsifying a hydrolyzable alkoxysilane represented by the formula:
R
f
—(CH
2
)
p
—Si {(—O—CH
2
CH
2
—)
n
—OR′)
3
wherein R
f
is a perfluoroalkyl radical of 3 to 18 carbon atoms, each R′ is independently an alkyl radical of 1 to 3 carbon atoms, p is 2 to 4 and n is 2 to 10, with an effective amount of an emulsifier of sufficiently high HLB value to simultaneously retain the hydrolyzable alkoxysilane compound in a substantially totally hydrolyzed state while inhibiting the self-condensation of the hydrolyzed alkoxysilane. Suitable emulsifiers are said to include alkylbenzenesulfonates, linear alkydiphenyletherdisulfonates, alpha-olefin sulfonates, ethoxylated alkyl alcohol ethers, ethoxylated alkyl alcohol ether sulfates, ethoxylated alkylphenols, ethoxylated alkylphenol ether sulfates, ethoxylated perfluoroalkylalkanols, C
8-18
alkyltrimethylammonium salts, C
8-18
alkyldimethylammonium salts, ethoxylated C
8-18
amine salts, alpha-trimethylamino fatty acid betaines and perfluoroalkyl amphoteric surfactants of the type R
f
—CH
2
CH(OR″)CH
2
N(CH
3
)2CH
2
CO
2
(inner salt) where R″ is H or acetyl, and quaternary salts of the type R
f
—CH
2
CH
2
SCH
2
CH(OH)CH
2
N(CH
3
)
3
+
Cl
−
. According to PCT International Publication No. WO 95/23804, the alkoxysilanes are believed to be hydrolyzed to hydroxysilanes represented by the formula:
R
f
—(CH
2
)—Si—(OH)
3
which do not substantially self-condense when the emulsifier is present.
A similar, but non-fluorinated, alkoxysilane aqueous emulsion is TLF-8291, available from E.I. Du Pont de Nemours and Company, Wilmington, Del. TLF-8291 is believed to contain hydrolyzed C
18
-alkyltrialkoxysilane (about 10% by weight of the emulsion) in combination with C
8-18
tetraalkylammonium chloride (about 30 to 40% by weight of the silane) in water. While the hydrolyzed trialkoxysilane aqueous emulsion appears stable as provided, simple dilution of the aqueous emulsion has been found to give a commercially unacceptable cleaning formulation due to poor cleaning efficacy and silane attachment to glass containers holding such a formulation.
Cleaning formulations containing hydrolyzable quaternary silanes or hydrolyzed trialkoxysilanes, such as TLF-8291, which are stable, avoid substantial silane attacluhent to glass storage containers, provide excellent cleaning, uniform surface deposition after wipe out, and excellent surface wetting and leveling would be highly desirable.
SUMMARY OF THE INVENTION
This invention relates to an acidic cleaning formulation for cleaning hard surfaces comprising: (a) a surface modification agent selected from the group consisting of (i) a hydrolyzed trialkoxysilane in an amount from about 0.00001 to about 10.0 percent by weight of the formulation and (ii) a hydrolyzable quaternary silane in an amount from about 0.00001 to about 10.0 percent by weight of the formulation; (b) a surfactant in an amount from about 0.00001 to about 10.0 percent by weight of the formulation, provided that if the surface modification agent is a hydrolyzable quaternary silane then the surfactant is not a quaternary ammonium compound or sulfobetaine; (c) at least one alcohol having 1 to 12 carbon atoms; and water. Preferably, the hydrolyzed trialkoxysilane is formed in an aqueous emulsion from a hydrolyzable trialkoxysilane compound emulsified in water with about 5 to 100 percent by weight of an emulsifier based on the weight of the hydrolyzable trialkoxysilane and the surfactant is different than the emulsifier. In this preferred embodiment, the emulsifier employed to emulsify the hydrolyzable trialkoxysilane must be i
Qazi Sabiha
S.C. Johnson & Son Inc.
LandOfFree
Acidic cleaning formulation containing a surface... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Acidic cleaning formulation containing a surface..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Acidic cleaning formulation containing a surface... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3194216