Antimicrobial abrasive cream type cleaning compositions for inanimate hard surfaces

Abstract

The present invention provides aqueous alkaline, storage stable, abrasive containing hard surface treatment compositions which provide good cleaning to a treated hard surface, and concurrently a useful sanitizing or disinfecting benefit to such treated surfaces, wherein the compositions comprise: 0.01-15% wt. of at least one anionic surfactant and at least one nonionic surfactant, and preferably wherein the amount of the at least one anionic surfactant is in excess of the amount of the at least one nonionic surfactant; 0.1-50% wt. of one or more inorganic abrasive particulate materials which are based on inorganic carbonate compounds; a thickener; at least one non-cationic germicide constituent, which preferably are one or more compounds selected from the group consisting of: parachlorometaxylenol, and halogenated carbanilides (e.g., 3,4,4′-trichlorocarbanilide (also referred to as Triclocarban® or TCC), 3-trifluoromethyl-4,4-dichlorocarbanilide, and 3,3,4-trichlorocarbanilide; and, water, wherein the compositions preferably exhibit a pH in the range of 7-10.5, a viscosity of 1000-3000 cPs, when measured at 25° C., and wherein the compositions provide an antimicrobial benefit to treated hard surfaces.

Claims

1. An aqueous alkaline, storage stable, abrasive containing hard surface treatment composition which concurrently provides a cleaning and a sanitizing and/or disinfecting benefit to hard surface, wherein the composition comprises: 0.01-15% wt. of at least one anionic surfactant and at least one nonionic surfactant, and wherein the amount of the at least one anionic surfactant is in excess of the amount of the at least one nonionic surfactant; 0.1-50% wt. of one or more inorganic abrasive particulate materials which are based on inorganic carbonate compounds; a gum based thickener; at least one non-cationic germicide constituent, which is one or more compounds selected from the group consisting of: parachlorometaxylenol, and halogenated carbanilides; at least 50% wt. of water; 0.001-5% wt. of sodium borate as a pH adjusting agent and/or a pH buffer; wherein the composition exhibits a pH in the range of 7 -10.5, and exhibits a viscosity of 1000-3000 cPs, when measured at 25° C.; and, wherein the composition exhibits a retention of initial color of the composition which is parity with a sample of the composition subsequent to 6 weeks storage at 40 deg.C.

2. An aqueous alkaline, storage stable, abrasive containing hard surface treatment composition which concurrently provides a cleaning and a useful sanitizing and/or disinfecting benefit to a hard surface wherein the composition comprises: 0.01-15% wt. of at least one anionic surfactant and at least one nonionic surfactant, and wherein the amount of the at least one anionic surfactant is in excess of the amount of the at least one nonionic surfactant; 0.1-50% wt. of one or more inorganic abrasive particulate materials which are based on inorganic carbonate compounds; a gum based thickener; at least one non-cationic germicide constituent selected from the group consisting of: parachlorometaxylenol, and halogenated carbanilides; at least 50% wt. of water; and, 0.1-2% wt. of sodium borate as a pH adjusting agent and/or a pH buffer; wherein the composition exhibits a pH in the range of 7-10.5, and exhibits a viscosity of 1000 -3000 cPs, when measured at 25° C.; and, wherein the composition exhibits a retention of initial color of the composition which is parity with a sample of the composition subsequent to 6 weeks storage at 40 deg.C.

3. A composition according to claim 1, wherein the composition further comprises 0.001-10% wt. of at least one organic solvent.

4. A composition according to claim 1, wherein the gum based thickener is xanthan gum, and excluded from the compositions are one or more different conventional thickeners based on naturally occurring or modified celluloses.

5. A composition according to claim 1 wherein the gum based thickener is xanthan gum, and which is the sole thickener present in the composition.

6. A composition according to claim 1 wherein the non-cationic germicide constituent is solely parachlorometaxylenol.

7. A composition according to claim 1 wherein the one or more inorganic abrasive particulate materials are inorganic carbonates.

8. A method of providing a cleaning and an antimicrobial benefit to a hard surface, which method comprises the step of: providing the aqueous, storage stable, abrasive containing hard surface treatment composition according to claim 1, to the said hard surface so to provide a cleaning and a sanitizing and/or antimicrobial benefit thereto.

9. A composition according to claim 1 wherein the halogenated carbanilides are selected from the group consisting of: 3,4,4′-trichlorocarbanilide, 3-trifluoromethyle-4,4-dichlorocarbanilide, and 3,3,4-trichlorocarbanilide.

10. A composition according to claim 2, wherein the composition further comprises 0.001-10% wt. of at least one organic solvent.

11. A composition according to claim 2, wherein the gum based thickener is xanthan gum, and excluded from the compositions are one or more different conventional thickeners based on naturally occurring or modified celluloses.

12. A composition according to claim 2, wherein gum based thickener is xantham gum, and which is the sole thickener present in the composition.

13. A composition according to claim 2, wherein the non-cationic germicide constituent is solely parachlorometaxylenol.

14. A composition according to claim 2, wherein the the one or more inorganic abrasive particulate materials are inorganic carbonates.

Description

EXAMPLES

(1) Formulations according to the invention were produced by mixing the constituents outlined in Table 1 by adding the individual constituents into a beaker of water at room temperature which was stirred with a conventional magnetic stirring rod. Stirring continued until each of the formulations were homogenous in appearance. It is to be noted that the constituents might be added in any order, but it is preferred that a major proportion of water be the initial constituent provided to a mixing vessel or apparatus as it is the major constituent and addition of the further constituents thereto is convenient. Still more preferably to a major part of the water which is maintained under constant stirring are added the constituents are added with a sufficient time lapse between the addition of each constituent in order to ensure that the immediately prior added constituent has been homogenously blended. After the addition of the final constituent, mixing continued for 5-60 minutes to ensure homogenous blending.

(2) These compositions according to the examples are indicated on Table 1 by the letter “E” followed by a digit.

(3) Certain compositions which are considered to be “comparative examples” were also produced in the manner described above and using the same constituents, and these comparative examples are indicated on Table 2, following. These compositions according to the comparative examples are indicated by the letter “C” followed by a digit.

(4) TABLE-US-00001 TABLE 1 E1 E2 E3 E4 E5 E6 E7 E8 sodium lauryl sulfate 5.0 5.0 5.0 5.0 — — — — (28%) alcohol ethoxylate 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 (99.5%) PCMX (98%) 1.0 1.0 1.0 1.0 2.4 1.0 0.8 0.5 particulate carbonate 15.0  15.0  15.0  15.0  — — — — (94.5%) calcium magnesium — — — — 15.0  15.0  15.0  15.0  carbonate (95%) xanthan gum (98%) 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 magnesium aluminum — — — — 0.1 — — — silicate alkylsulphonic acid — — — — 1.2 1.2 1.2 1.2 (96%) propylene glycol 2.0 2.0 2.0 2.0 5.0 2.0 2.0 2.0 monoethanolamine — 0.5 — 0.5 — — — — (90%) sodium hydroxide — — — — 0.6 0.6 0.6 0.6 sodium borate (98%) 0.5 — 0.5 — — — — — fragrance1 0.2 0.2 — — 0.2 0.2 0.2 0.2 fragrance2 — — 0.2 0.2 — — — — preservative  0.05  0.05  0.05  0.05 — — — — RO water q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. E9 E10 E11 E12 E13 E14 E15 sodium lauryl sulfate — — 17.85 — 5.0 5.0 5.0 (28%) alcohol ethoxylate 1.0 1.0 2.0 2.0 1.0 1.0 1.0 (99.5%) PCMX (98%) 1.0 1.0 1.0 1.0 1.0 1.0 1.0 particulate carbonate 15.0  15.0  13.0  13.0  15.0  15.0  15.0  (94.5%) calcium magnesium — — — — — — — carbonate (95%) xanthan gum (98%) 0.6 0.6 — — 0.6 0.6 0.6 magnesium aluminum — 0.3 — — 0.3 — — silicate acrylate thickener — — 0.4 0.4 — — — alkylsulphonic acid 1.2 1.2 — 1.2 — — — (96%) propylene glycol 2.0 2.0 — — 2.0 2.0 2.0 monoethanolamine — — — — — — — (90%) sodium hydroxide 0.6 0.6 — 0.6 — — — sodium borate (98%) — — — — — — — sodium carbonate — — 5.0 5.0 5.0 5.0 — (98%) fragrance1 0.2 0.2 0.2 0.2 0.2 0.2 0.2 fragrance2 — — — — — — — preservative  0.05  0.05  0.02  0.02  0.05  0.05  0.05 RO water q.s. q.s. q.s. q.s. q.s. q.s. q.s.

(5) The following table identifies the individual constituents described in the foregoing examples. The constituents were used “as supplied” from their respective suppliers and may constitute less than 100% wt. “actives” in which case the amount is indicated in parenthesis, or may have been supplied as constituting 100% wt. “active” of the named compound, as indicated in the following Table.

(6) TABLE-US-00002 TABLE 2 sodium lauryl anionic surfactant, sodium lauryl sulfate sulfate (28%) (28% wt. active) supplied as Empicol LX 28 (ex. Huntsman Co.) alcohol ethoxylate nonionic surfactant, linear alcohol (99.5% minimum) ethoxylate, (99.5% wt. active) supplied as Rokanol L10 (ex. Rokita SA) PCMX (98% minimum) parachlorometaxylenol (98% wt. active) (ex. Thomas Swan & Co., Ltd.) particulate carbonate supplied as Kulubrite 15 (94.5% wt. active) (94.5% minimum) (150 micrometers avg. particle size) calcium magnesium supplied as comminuted particulate dolomite carbonate particles (95% minimum) xanthan gum supplied as Hydrocol CG (98% wt. active) (98% minimum) (ex. Shangdong Fufeng Fermentation Co., Ltc.) magnesium magnesium aluminum silicate, (100% wt. aluminum silicate active) supplied as Veegum T (ex. R. T. Vanderbilt) propylene glycol propylene glycol, laboratory grade (ex. DOW Chem. Co.) nonoethanolamine laboratory grade monoethanolamine (90% minimum) (90% wt. active) as pH adjusting agent sodium hydroxide laboratory grade sodium hydroxide (100% wt. actives) sodium borate supplied as hydrated borax (98% wt. (98% minimum) active) (ex. Searles Valley Minerals) as pH adjusting agent Fragrance1 lavender fragrance, proprietary composition of its supplier Fragrance2 pine-type fragrance, proprietary composition of its supplier preservative supplied as Acticide BW 20, used as supplied RO water purified water via reverse osmosis

(7) The compositions of E1 and E2 demonstrated good storage stability and good antimicrobial efficacy when tested as demonstrated by the following.

(8) Storage Stability Testing

(9) The visual appearance (perceived viscosity, color), fragrance, specific gravity “SG”, pH and viscosity, of the E1-E4 compositions were tested both initially (“as mixed”) and at periodic weekly intervals thereafter, with separate aliquots of the E1-E4 compositions being stored at different temperatures. The separate aliquots of the E1-E4 compositions were stored at one of the following temperatures: −20° C., 5° C., 25° C., 40° C., 50° C., and 60° C. over the span of one to several weeks. At the time intervals indicated on Table 3, a sample was removed from the indicated storage temperature, allowed to equilibrate to room temperature (25° C.) and thereafter tested, with the indicated results reported on the table. The color, and appearance of the samples were visually observed and noted with an initial aliquot of the composition used as a comparative reference, and a reported result of “good” indicated parity with the reference sample, whereas “off-white” indicated a visible reduction in sample appearance as compared to the reference. The fragrance was evaluated by smelling the tested composition and comparing it with an initial aliquot of the composition; the substantivity of the reference aliquot was assigned a rating “5” and the fragrance was tested for relative substantivity on a scale of “5 to 0”, with a “5” rating assigned to those tested formulations which were considered to have parity with the reference sample to the other extreme of the scale wherein “0” is assigned to a tested sample having no perceived fragrance. It is to be noted that a sample of each of the E1-E4 compositions was subjected to a freeze-thaw cycle (indicated as storage condition (“−20° C.”) wherein the sample was completely frozen, stored for the indicated time interval, thereafter allowed to thaw and allowed to equilibrate to room temperature (25° C.) for 12-24 hours and thereafter tested, with the indicated results reported on the table. The results were averaged and reported on the following Table 3.

(10) TABLE-US-00003 TABLE 3 storage temperature −20° C. 5° C. 25° C. 40° C. 50° C. 60° C. E1 Initial (as mixed) appearance — — good — — — color — — good — — — fragrance — — 5 — — — pH at 25° C. — — 8.85 — — — viscosity (cPs) — — 1850 — — — SG — — 1.12 — — — Week 1 appearance good good good good good good color good good good good good good fragrance 5 5 5 5 5 5 pH at 25° C. 8.81 8.82 8.1 8.69 8.64 8.54 viscosity (cPs) 2500 2200 2420 2480 2475 2385 SG — 1.0979 1.1104 1.1290 1.1161 1.1222 Week 3 appearance good good good good good — color — good good good good — fragrance — 5 5 4 4 — pH at 25° C. — 8.78 8.61 8.58 8.56 — viscosity (cPs) — 2120 2500 2400 2460 — SG — 1.1113 1.1112 1.1177 1.1247 — Week 6 appearance — good good good good — color — good good good good — fragrance — 5 5 4 3 — pH at 25° C. — 8.76 8.66 8.62 8.60 — viscosity (cPs) — 2050 2570 2495 — — SG — 1.11 1.11 .1.12 1.12 — Week 12 appearance — good good good — — color — good good good — — fragrance — 5 4 3 — — pH at 25° C. — 8.71 8.63 8.57 — — viscosity (cPs) — 2190 2485 2430 — — SG — 1.11 1.11 1.11 — — “—” indicated that the sample was not tested E2 Initial (as mixed) appearance — — good — — — color — — good — — — fragrance — — 5 — — — pH at 25° C. — — 10.51 — — — viscosity (cPs) — — 1985 — — — SG — — 1.15 — — — Week 1 appearance good good good good good good color good good good good good good fragrance 5 5 5 5 5 5 pH at 25° C. 10.96 10.67 10.67 10.56 10.56 10.59 viscosity (cPs) 2435 2100 2050 2015 2015 1995 SG — 1.0975 1.1145 1.1117 1.1206 1.1215 Week 3 appearance — good good good good — color — good good good off- — white fragrance — 5 5 4 4 — pH at 25° C. — 10.56 10.48 10.32 10.44 — viscosity (cPs) — 2045 2115 2075 1975 — SG — 1.1081 1.1214 1.1228 1.1169 — Week 6 appearance — good good good good — color — good off- off- off- — white white white fragrance — 5 5 4 3 — pH at 25° C. — 10.6 1058 10.52 10.47 — viscosity (cPs) — 2095 2080 2065 2150 — SG — 1.11 1.12 1.12 1.12 — Week 12 appearance — good good good — — color — off- off- off- — — white white white fragrance — 4 4 3 — — pH at 25° C. — 10.62 10.6 10.52 — — viscosity (cPs) — 2025 2065 1990 — — SG — — — — — — “—” indicated that the sample was not tested E3 Initial (as mixed) appearance — — good — — — color — — good — — — fragrance — — 5 — — — pH at 25° C. — — 8.9 — — — viscosity (cPs) — — 1950 — — — SG — — 1.08 — — — Week 1 appearance good good good good good good color good good good good good good fragrance 5 5 5 5 5 5 pH at 25° C. 8.74 8.73 8.66 8.61 8.58 8.58 viscosity (cPs) 2480 2135 2000 2460 2430 2425 SG 1.0858 1.1225 1.1224 1.0960 1.0956 1.0879 Week 3 appearance — good good good good — color — good good good good — fragrance — 5 5 4 4 — pH at 25° C. — 8.69 8.57 8.55 8.52 — viscosity (cPs) — 2215 2250 2430 2425 — SG — 1.12 1.12 1.11 1.10 — Week 6 appearance — good good good good — color — good good good off- — white fragrance — 5 5 4 3 — pH at 25° C. — 8.71 8.65 8.50 8.49 — viscosity (cPs) — 2270 2295 2495 2500 — SG — 1.12 1.12 1.11 1.10 — Week 12 appearance — good good good — — color — good good off- — — white fragrance — 5 4 3 — — pH at 25° C. — 8.69 8.66 8.53 — — viscosity (cPs) — 2195 2260 2400 — — SG — 1.12 1.11 1.11 — — “—” indicated that the sample was not tested E4 Initial (as mixed) appearance — — good — — — color — — good — — — fragrance — — 5 — — — pH at 25° C. — — 10.99 — — — viscosity (cPs) — — 1875 — — — SG — — 1.08 — — — Week 1 appearance phase good good good good good separation color good good good good good good fragrance 5 5 5 5 5 5 pH at 25° C. — 10.6 10.62 10.60 10.68 10.57 viscosity (cPs) — 2085 2055 2090 2110 2170 SG — 1.0830 1.0822 1.0858 1.0883 1.0915 Week 3 appearance — good good good good — color — good off- off- off- — white white white fragrance — 5 5 4 4 — pH at 25° C. — 10.49 10.47 10.44 10.47 — viscosity (cPs) — 2110 2060 2070 2090 — SG — 1.11 1.11 1.1 1.11 — Week 6 appearance — good good good good — color — good off- off- off- — white white white fragrance — 5 5 4 3 — pH at 25° C. — 10.56 10.53 10.54 10.49 — viscosity (cPs) — 2155 2120 2095 2005 — SG — 1.11 1.11 1.1 1.11 — Week 12 appearance — good good good — — color — off- off- off- — — white white white fragrance — 5 4 3 — — pH at 25° C. — 10.52 10.49 10.38 — — viscosity (cPs) — 2085 2030 1975 — — SG — 1.11 1.12 1.10 — — “—” indicated that the sample was not tested, also, due to phase separation (“splitting”) of the −20° C. sample which was thus not subjected to further tests
As is clearly understood from the reports resulted from Table 3, preferred compositions of the invention exhibited excellent retention of viscosity and specific gravity even under adverse storage conditions for multiple weeks, including at high temperatures. Preferred compositions also were phase stable, viz., did not split into two or more phases during or after the testing. Additionally when visually observed the preferred compositions appeared to retain reasonably good color and fragrance characteristics, and, most of the tested compositions appeared to a visual observer be thick and sufficiently viscous when poured from a container, which is substantiated by generally excellent retention of viscosity and specific gravity and suspension of the abrasives within the composition.
Antimicrobial Efficacy:

(11) The antimicrobial efficacy of compositions E1, E2 and E5-E7 as described with reference to Table 1 were evaluated according to SANS 1615-2011 (South Africa National Standard) without dilution, against the following challenge organism: Pseudomonas aeruginosa (ATCC 15442 Pse 16), Escherichia coli (ATCC 8739 Esc 20) and Staphylococcus aureus (ATCC 6538 Sta 10) according to the recited test protocols, which specifically included: dilution of tested samples was “as is”, testing temperature was 22° C., dilutent for test solutions was a sterile hard water at 250 ppm hardness containing 1% skimmed milk, the exposure times were 5 minutes, the loading of the challenge organisms was approx. 10.sup.5 organisms per ml of the test solution, a suitable fluid inactivator was used to stop the test, and the counting medium was laboratory grade nutrient agar. The results of this testing are reported on Table 4.

(12) TABLE-US-00004 TABLE 4 % inactivation (kill), 5 minute contact time Pseudomonas Staphylococcus aeruginosa Escherichia coli aureus E1 99.9 99.9 99.9 E2 99.9 99.9 99.9 E5 99.9 99.9 99.9 E6 99.9 99.9 99.9 E7 99.9 99.9 99.9
As is seen from the foregoing each of the tested compositions exhibited good microbicidal efficacy.

(13) It will be appreciated by those skilled in the art that changes could be made to the embodiments described above without departing from the broad inventive concept thereof. It is understood, therefore, that this invention is not limited to the particular embodiments disclosed, but it is intended to cover modifications within the spirit and scope of the present invention as defined by the appended claims.