Hard surface cleaners including fluorosurfactants

Abstract

Hard surface, in particular glass, cleaners having an ease in wipe-out while providing good cleaning with a streak-free, glossy shine are described. The cleaner includes at least one fluorosurfactant including a fluorinated functional group with 2 to 6 carbon atoms, and a hydrophilic moiety; at least one non-fluorinated surfactant; a combination of solvents; a combination of cleaning agents; and water.

Claims

1. A hard surface cleaner consisting of (a) about 0.001 to about 0.5 wt. % of at least one fluorinated surfactant having a fluorine-containing moiety having a formula of either linear or branched (1) F(CF.sub.2).sub.n where n is 2-6 or (2) (C.sub.2F.sub.5).sub.3, and a hydrophilic moiety; (b) a plurality of solvents of greater than 0 to about 7 wt. % of at least one C.sub.1-C.sub.3 alkanol, greater than 0 to about 5 wt. % of at least one ethylene glycol C.sub.1-6 alkyl ether, and greater than 0 to about 5 wt. % of at least one propylene glycol C.sub.1-6 alkyl ether; (c) a plurality of cleaning agents of greater than 0 to about 6 wt. % of at least one mono- or di-alkanolamine having a C.sub.1-3 carbon chain, and greater than 0 to about 5 wt. % of at least one ammonium, sodium or potassium hydroxide; (d) greater than 0 to about 5 wt. % of at least one anionic alkane or aromatic sulfonate or sulfate; (e) a balance to 100% of water; (f) optionally, a solubilizer; and (g) optionally, a fragrance and/or colorant; wherein said cleaner has a volatile organic content (VOC) of 3 or less, and is able to remove greasy soil and be removed from a surface treated with the cleaner without leaving a residual haze on the surface.

2. The hard surface cleaner of claim 1 wherein the fluorine-containing moiety is a C.sub.2-C.sub.6 linear chain fluorinated functional group.

3. The hard surface cleaner of claim 1 wherein the fluorine-containing moiety is a C.sub.2-C.sub.6 branched chain fluorinated functional group.

4. The hard surface cleaner of claim 1 wherein said plurality of solvents are propanol, ethylene glycol hexyl ether, and propylene glycol propyl ether.

5. The hard surface cleaner of claim 1 wherein the plurality of cleaning agents are isopropanolamine and ammonium hydroxide.

6. The hard surface cleaner of claim 1 wherein said solubilizer is an alkylene glycol.

7. The hard surface cleaner of claim 1 wherein said solubilizer is propylene glycol.

8. The hard surface cleaner of claim 1 wherein said anionic alkane or aromatic sulfonate or sulfate is an alkali metal alkane sulfonate.

9. The hard surface cleaner of claim 1 wherein said cleaner comprises about 0.01 to about 0.4 wt. % of said fluorinated surfactant, about 1.5 to about 2.5 wt. % of said alkanol, about 0.01 to about 1 wt. % of said ethylene glycol C.sub.1-6 alkyl ether, about 0.01 to about 1 wt. % of said propylene glycol C.sub.1-6 alkyl ether, about 0.01 to about 2 wt. % of said mono- or di-alkanolamine, about 0.01 to about 1 wt. % of said hydroxide, about 0.01 to about 2 wt. % of said anionic alkane or aromatic sulfonate or sulfate, and a balance to 100 wt. % of said water.

10. A hard surface cleaner consisting of about 0.01 to about 0.4 wt. % of a fluorinated surfactant having a fluorinated functional group having linear or branched carbon atoms and a formula of either (1) F(CF.sub.2).sub.n where n is 2-6 or (2) (C.sub.2F.sub.5).sub.3; about 1.9 to about 2.1 wt. % of isopropanol; about 0.15 to about 0.35 wt. % of propylene glycol propyl ether; about 0.3 to about 0.5 wt. % of ethylene glycol hexyl ether; about 0.4 to about 0.6 wt. % of isopropanolamine; about 0.2 to about 0.4 wt. % of ammonium hydroxide; about 0.1 to about 0.4 wt. % of alkali metal alkane sulfonate; a balance to 100 wt. % of water; and optionally, one or more of a solubilizer, fragrance and colorant; wherein said cleaner has a volatile organic content (VOC) of 3 or less, and is able to remove greasy soil and be removed from a surface treated with the cleaner without leaving behind a residual haze on the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

(1) Hard surface cleaners, in particular glass cleaners, have been known to include various solvent and surfactant combinations. However, in order to obtain the desired cleaning with good wipe-out which provides gloss and shine to a surface, such cleaners included ingredients which resulted in a high volatile organic content (VOC) and toxicity to the environment and/or were accumulated in living organisms (plants and/or animals). Accordingly, it is desirable to provide a hard surface cleaner having the same or better cleaning and wipe-out with a low to zero VOC, non-toxicity, and no bio-accumulation. The present invention provides such a cleaner based on a unique combination of ingredients. The cleaner of the invention provides for improved glide (i.e., reduced drag) across a hard surface, in particular glass, to allow for ease in wiping and enhancement in overall performance.

(2) The cleaner of the invention includes a combination of solvents, a combination of cleaning aids, at least one non-fluorinated surfactant, at least one fluorinated surfactant, and an aqueous-based carrier or diluent, preferably water. The cleaner preferably has a VOC of 3% or less. Further, the cleaner preferably includes at least one solubilizing aid, a colorant or dye, and fragrance.

(3) The at least one fluorinated surfactant serves as a surface modifier which improves the gloss and aids in improving the glide across the surface being treated, i.e., the wipe-out, which then enhances the overall performance of the cleaner, e.g., soil removal and non-streaking. The fluorinated surfactant(s) lower(s) the surface tension of the cleaner composition which aids in the ease of wiping.

(4) Fluorinated surfactants suitable for use in the cleaner of the invention are compounds including a fluorinated carbon functional group and a hydrophilic functional group. The fluorinated carbon functional group includes 2 to 6 carbon atoms, wherein the carbons are present as a single linear group or are present as a plurality of branched short chain groups where the total number of carbons of the branched groups does not exceed 6 carbons. Preferred fluorinated surfactants for inclusion in the cleaner of the invention are anionic, nonionic or amphoteric.

(5) Examples of fluorinated surfactants suitable for use including a short linear chain fluorinated functional group of F(CF.sub.2).sub.n.sup. where n=6 or less, and hydrophilic group. Such fluorinated surfactants are sold under the trade name CAPSTONE by DuPont and have a formula F(CF.sub.2).sub.nCH.sub.2CH.sub.2.sup. where n=6 or shorter. Particular CAPSTONE fluorosurfactants suitable for use are CAPSTONE FS-50 which is amphoteric, CAPSTONE FS-60 which is anionic, and CAPSTONE FS-65 which is nonionic. Each of these are also identified by the manufacturer as being alkyl phenol exthoxylate (APEO)-free.

(6) Examples of fluorinated surfactants suitable for use including branched short chain fluorinated functional groups attached to a hydrophilic moiety are sold under the trade name TIVIDA FL by EMD. TIVIDA FL compounds include three short chain carbon groups where each group is 2 carbons in length, i.e., (C.sub.2F.sub.5).sub.3.hydrophilic moiety. TIVIDA compounds particularly suitable for use are TIVIDA FL 2300 and TIVIDA FL 2500.

(7) The use of a single fluorinated surfactant has been found suitable for inclusion in the hard surface cleaner of the invention, but a combination of fluorinated surfactants can also be used. Individual fluorosurfactants, in addition to providing the contributions described above, may have other properties or characteristics that contribute to different consumer preferred attributes for the cleaner and, thus, if different attributes are desired to be enhanced different fluorosurfactants may be combined to achieve the desired effect.

(8) The fluorinated surfactant(s) preferably are included in the cleaner of the invention in an amount in a range greater than 0 to about 5 wt. %, more preferably in an amount of about 0.001 to about 0.5 wt. %, and most preferably in a range of about 0.01 to about 0.4 wt. %.

(9) The combination of solvents included in the cleaner of the invention preferably is a combination of at least one short chain (i.e., C.sub.1-C.sub.6) alkanol and one or more alkylene glycol C.sub.1-C.sub.6 alkyl ether, more preferably a C.sub.1-C.sub.6 alkanol and two alkylene glycol C.sub.1-C.sub.6 alkyl ethers. A most preferred combination is isopropyl alcohol, propylene glycol n-propyl ether, and ethylene glycol n-hexyl ether.

(10) The alkanol solvent aids in the evaporation of the cleaner during the cleaning and wiping out of the cleaner. The C.sub.1-C.sub.6 alkanol is included in an amount in a range of greater than 0 to about 7 wt. %, more preferably about 1.5 to about 2.5 wt. %, and most preferably about 1.9 to about 2.1 wt. %.

(11) The alkylene glycol solvent aids in the drying and evaporation of any residue during and/or after wiping out of the cleaner from a treated surface. The at least one alkylene glycol C.sub.1-C.sub.6 alkyl ether is preferably included in an amount of about 0.01 to 6 wt. %, more preferably about 0.1 to about 2 wt. %, and most preferably about 0.5 to about 1 wt. %. For a combination of a propylene glycol alkyl ether and an ethylene glycol alkyl ether, the amounts for the propylene glycol alkyl ether preferably are greater than 0 to about 5 wt. %, more preferably about 0.01 to about 1 wt. %, and most preferably about 0.15 to about 0.35 wt. %, and the amount for the ethylene glycol alkyl ether preferably is greater than 0 to about 5 wt. %, more preferably about 0.01 to about 1 wt. %, and most preferably about 0.3 to about 0.5 wt. %

(12) The non-fluorinated surfactant is selected based on its ability to emulsify greasy soil and to enhance the ease of glide off of the cleaner from a treated surface without leaving behind a hazy residue. A majority of surfactants create a residue that quickly adheres to a treated surface, especially glass, during the wiping step of the cleaning process or creates foam during cleaning. Each of these characteristics interferes with the wiping out of the cleaner by a consumer during use of the cleaner, in particular as requiring more effort or work to remove the cleaner from the surface. Preferred non-fluorinated surfactants suitable for inclusion in the cleaner of the invention include anionic alkane or aromatic sulfonates or sulfates, more preferably anionic alkane sulfonates. A preferred non-fluorinated anionic surfactant suitable for use is sold under the trade name BIO-TERGE PAS-8S by Stepan which is sodium caprylyl sulfonate. Other non-fluorinated anionic surfactants useful in the cleaner include sodium dodecyl benzene sulfonate and sodium lauryl sulfate. Further preferred non-fluorinated surfactants suitable for inclusion in the cleaner of the invention include nonionic surfactants, such as secondary alcohol ethoxylates. Examples of preferred secondary alcohol ethoxylates are sold under the trade name TERGITOL by The Dow Chemical Co., more preferably TERGITOL 15-S-7 (also known as C.sub.11-15 Pareth-7) and TERGITOL 15-S-12 (also known as C.sub.11-15 Pareth-12).

(13) The non-fluorinated surfactant is preferably present in an amount in a range of greater than 0 to about 5 wt. %, more preferably about 0.01 to about 2 wt. %, and most preferably about 0.1 to about 0.4 wt. %.

(14) The preferred combination of cleaning agents included in the hard surface cleaner are selected from alkanolamines and hydroxides. More preferably, the combination of cleaning agents is one alkanolamine and one hydroxide compound.

(15) Alkanolamines suitable for use include mono- and di-alkanolamines, wherein the alkanol has a C.sub.1 to C.sub.3 carbon chain. A preferred alkanolamine is monoisopropanolamine (MIPA). The alkanolamine is preferably included in the cleaner in an amount in a range of greater than 0 to about 6 wt. %, more preferably about 0.01 to about 2 wt. %, and Most preferably about 0.4 to about 0.6 wt. %.

(16) The hydroxide serves as an alkaline source to aid in soil removal. Hydroxides suitable for use include ammonium hydroxide, sodium hydroxide and potassium hydroxide. The more preferred is ammonium hydroxide. The hydroxide is preferably present in an amount greater than 0 to about 5 wt. %, more preferably about 0.01 to about 1 wt. %, and most preferably about 0.2 to about 0.4 wt. %.

(17) The cleaner preferably also includes a solubilizer. The solubilizer is included to serve as a humectant in the dry down phase of the cleaner to provide a continuous film in various humidities. Preferred solubilizers suitable for use in the cleaner of the invention are short chain (i.e., C.sub.1-3) glycols. A more preferred solubilizer is propylene glycol. The solubilizer is preferably included in an amount in a range of greater than 0 to about 5 wt. %, more preferably about 0.1 to about 1 wt. %, and most preferably about 0.3 to about 0.4 wt. %.

(18) Adjuvants which are optional, but which are preferably included, are a fragrance and a colorant or dye.

(19) A fragrance is to be understood as meaning both a single fragrant or perfume compound and a blend of fragrant or perfume compounds. The fragrance is preferably included in the cleaner of the invention in an amount in a range of 0 to about 1 wt. %, more preferably about 0.001 to about 0.5 wt. %, and most preferably about 0.1 to about 0.4 wt. %.

(20) The colorant or dye is visually present in solution and is preferably included in an amount from 0 to about 1 wt. %, more preferably in an amount of about 0.001 to about 0.1 wt. %, and most preferably in an amount of about 0.005 to about 0.009 wt. %.

(21) The cleaner of the invention also includes an aqueous-based diluent or carrier. The preferred diluent/carrier is water, more preferably soft water, deionized water, reverse osmosis water and the like. The more preferred water for inclusion in the cleaner is soft water. The diluent/carrier is present in an amount to provide the wt. % balance of the cleaner to 100 wt. %.

(22) An example of a preferred glass cleaner formulation according to the invention is set forth in Table 1 below.

(23) TABLE-US-00001 TABLE 1 INGREDIENTS WT. % Soft Water 96.0326 Isopropanol 2.0 Propylene Glycol n-Propyl Ether 0.25 Hexyl Cellosolve 0.4 Propylene Glycol 0.2 Monoisopropanolamine (99%) 0.5 Ammonium Hydroxide (30%) 0.3 Sodium Caprylyl Sulfonate 0.26 Fragrance (no solubilizer) 0.025 Dye 0.0074 Fluorosurfactant 0.025 TOTAL 100% VOC = 2.5%

(24) The fluorosurfactant in the amount included in the glass cleaner formulation set forth in Table 1 can be any of CAPSTONE FS-50, CAPSTONE FS-60, CAPSTONE FS-65, TIVIDA FL 2300 and TIVIDA FL 2500.

(25) A. Comparative Testing

(26) The preferred glass cleaner set forth in Table 1 above was compared against a commercially available glass cleaner having a formula as set forth in Table 2 below.

(27) TABLE-US-00002 TABLE 2 INGREDIENTS WT. % Soft Water 98.6626 Hexyl Cellosolve 0.5 Monoisopropanolamine 0.2 Sodium Dodecyl Benzene Sulfonate 0.2 Lauryl Dimethyl Amine Oxide 0.1 Ammonium Hydroxide 0.3 Fragrance 0.03 Dye 0.0074 TOTAL 100% VOC = 0.2%

(28) (1) Machine Tests

(29) A machine was used to wipe out three cleaners identically applied to the same glass surface. The machine measured the wipe out performance and soil removal. Cleaner I is the cleaner of Table 1 containing CAPSTONE FS-50, Cleaner II is the cleaner of Table 1 containing TIVIDA FL 2500 and Cleaner III is the cleaner of Table 2 which does not include a fluorosurfactant.

(30) Machine Test Results: (a) Streak test Rating Scale: 0=No Streaks 5=Totally Streaked (i) Cleaner I=0.38 (ii) Cleaner II=0.38 (iii) Cleaner III=0.75 (b) Soil Removal Test Rating Scale: 0=All Soil Removed 5=No Soil Removed (i) Cleaner I=3.78 (ii) Cleaner II=3.86 (iii) Cleaner III=2.35

(31) (2) Hands on Tests

(32) People were used to manually perform the application of the glass cleaners by spraying the cleaner using an identical pump dispenser on an identical glass surface and the wiping action to clean and wipe off the cleaner from the surface. Cleaners I, II and III as described above in relation to the Machine Tests were also used in the Hands On Tests.

(33) Hands on Test Results:

(34) (a) Streak Test Under Low Light Environment (Afternoon Sun Simulation) Rating Scale: 0=No Streaks 5=Totally Streaked (i) Cleaner I=0.85 (ii) Cleaner II=1.85 (iii) Cleaner III=2.6

(35) (b) Overall Cleaner Performance Under Low Light Environment (Afternoon Sun Simulation) Rating Scale: 0=Completely Acceptable 5=Not At All Acceptable (i) Cleaner I=1.4 (ii) Cleaner II=2.15 (iii) Cleaner III=2.8

(36) (c) Streak Test Under High Light Environment (Direct Sunlight, Mid-Day Simulation) Rating Scale: 0=No Streaks 5=Totally Streaked (i) Cleaner I=0.9 (ii) Cleaner II=1.7 (iii) Cleaner III=3.15

(37) (d) Overall Cleaner Performance Under High Light Environment (Direct Sunlight, Mid-Day Simulation) Rating Scale: 0=Completely Acceptable 5=Not At All Acceptable (i) Cleaner I=1.8 (ii) Cleaner II=2.2 (iii) Cleaner III=3.85

(38) (e) Glide Test (Amount of Drag) Rating Scale: 0=Glides Easily 5=Sticks (i) Cleaner I=1.55 (ii) Cleaner II=1.2 (iii) Cleaner III=0.45

(39) (f) Ease of Cleaning Test Rating Scale: 0=Effortless 5=Tough (i) Cleaner I=1.7 (ii) Cleaner II=1.7 (iii) Cleaner III=1.85

(40) (3) Performance Summary

(41) TABLE-US-00003 Cleaner I v. Cleaner II v. Performance Cleaner III Cleaner III Overall Performance 61% v. 39% 57% v. 43% (% Prefer) Removes 55% v. 45% 58% v. 42% Fingerprints, Smudges and Smears (% Prefer) Does not leave a 58% v. 42% 60% v. 40% residue or streaks (% Prefer) Leaves a Surface 56% v. 44% 58% v. 42% Shiny (% Prefer) Other Performance Streak-free shine; Cleaning non-glass Advantages of less wiping; surfaces with less Cleaner I/Cleaner II overall smell; wiping and streak- over Cleaner III overall cleaning; free shine no residual haze; dries quickly while wiping; easy spray control

(42) Both Cleaners I and II show advantage in cleaning with less wiping and good overall performance, and is preferred for a streak-free shine.

(43) The exemplary embodiments herein disclosed are not intended to be exhaustive or to unnecessarily limit the scope of the invention. The exemplary embodiments were chosen and described in order to explain the principles of the present invention so that others skilled in the art may practice the invention. As will be apparent to one skilled in the art, various modifications can be made within the scope of the aforesaid description. Such modifications being within the ability of one skilled in the art form a part of the present invention and are embraced by the appended claims.