Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2001-07-18
2003-03-25
Ogden, Necholus (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S136000, C510S424000, C510S428000, C510S480000, C510S504000
Reexamination Certificate
active
06537952
ABSTRACT:
SUMMARY
The instant invention is a foaming cleansing product that provides a more sanitary washing experience within a preferred embodiment a countertop dispenser, and an instant foam, and superior deposition of anti-bacterial agent.
Preferably the inventive product is used with a countertop mechanical pump allowing the foam to be dispensed directly onto the hands without soiled hands touching (and soiling) the pump or the sink faucet. Preferably the pump is situated in a stable position so that the forearm can be used to depress the pump and dispense the product. This results in a more hygienic cleansing process. In addition, initial dilution with water is not required since the foam can be distributed prior to rinsing.
An unexpected benefit of the inventive foamed cleansing product is improved delivery of an anti-bacterial agent, when present, from an instant foam delivery. This form of application unexpectedly enhances the delivery of antibacterial agent, since the same amount of agent is applied directly to the skin in the form of concentrated foam or lather as compared to dilution required by standard hand cleansing liquids to make lather for even distribution of the product on the skin.
A further unexpected benefit of the inventive cleansing product is the enhanced deposition of the hydrophobic anti-bacterial agent on the skin, such as triclosan, compared to the deposition of the same agent in the liquid cleansing product with without the foam.
A still further unexpected benefit of the inventive cleansing product is the substantially improved cleansing performance with waxy type makeup, and the like, compared to the use of the liquid cleansing product without the foam.
DETAILED DESCRIPTION
In one aspect, the inventive composition comprises a surfactant blend including an anionic surfactant, and at least one surfactant selected from a nonionic and an amphoteric surfactant, a cationic polymer, and a hydrophobic antibacterial agent, and contains less than 0.05 wt. % of a water insoluble emollient; said composition being dispensed by a mechanical pump to provide a foam, i.e. a mixture of air and liquid. Preferably the foam has a density range of 0.05 to 0.20 g/mIl Preferably the inventive cleansing product has a weight ratio of anionic surfactants to the sum of nonionic and amphoteric surfactants in the range of 0.2 to 1 to 3 to 1; more preferably in the range of 1.5 to 1 to 2.5 to 1.
As used herein, the term hydrophobic in relation to anti-bacterial component means a material which is more lipid soluble, i.e. non-aqueous soluble, than aqueous soluble. The total amount of surfactants in the inventive composition does not exceed about 12.0 wt. %, and preferably does not exceed 10.5 wt. %. The viscosity of the inventive composition is in the range of 1 to 500 cps, preferably 1 to 200 cps at 25 C as measured by a Brookfield HBDVII+viscometer using 0.5 rpm and spindle #41. Preferably the composition contains a water-soluble emollient, including one or more polyhydric alcohols, more preferably glycerin and polyethylene glycol. Preferably the water-soluble emollient is in the concentration range of about 0.5 to 10 wt. %.
Water insoluble emollients require sufficient solubilizers such as surfactants when formulated into aqueous systems. With regard to the inventive composition, the pump requires a low surfactant concentration for optimum viscosity and foam production which limits the total amount of water insoluble material (including fragrance and the hydrophobic anti-bacterial agent) to a level capable of being dispersed or suspended therein. Furthermore, the inventive composition provides for excellent skin feel as determined by art recognized techniques, notwithstanding the lack of water insoluble emollients.
Compositions of the present invention preferably are free of any oil phase, especially free of water insoluble emollients. The term “free” means less than 0.05%, preferably less than 0.01% emollient, and water insoluble means any emollient having a solubility in distilled water at 25 C of less than about 1 gm per 100 mL, more preferably less than about 0.1 gm per 100 mL. Absent water insoluble emollients, the compositions can be transparent and have improved foamability.
In another aspect of the invention, enhanced deposition of hydrophobic anti-bacterial agents to the skin is provided which accompanies the application of the inventive composition. This effect is illustrated in Example 2 below.
In a further aspect of the invention, surprisingly efficient waxy cosmetics removal is provided following the application and rinsing of the inventive composition. Waxy cosmetics are here defined as cosmetics containing wax such as beeswax, carnauba wax, paraffin wax, and the like, preferably at a level in excess of about 10 wt. %. Representative examples include mascara, lipstick, cream blush, and the like. Such cosmetics may also optionally contain film forming polymers such as polyvinylpyrrolidone and copolymers of vinylpyrrolidone with e.g. polyurethane; and the like. This effect is illustrated in Example 3 below.
Anionic Surfactants
A further component of cleansing compositions according to the present invention is that of an anionic surfactant. Illustrative but not limiting examples include the following classes:
(1) Alkyl benzene sulfonates in which the alkyl group contains from 9 to 15 carbon atoms, preferably 11 to 14 carbon atoms in straight chain or branched chain configuration. Especially preferred is a linear alkyl benzene sulfonate containing about 12 carbon atoms in the alkyl chain.
(2) Alkyl sulfates obtained by sulfating an alcohol having 8 to 22 carbon atoms, preferably 12 to 16 carbon atoms. The alkyl sulfates have the formula ROSO3—M+where R is the C8-22 alkyl group and M is a mono- and/or divalent cation.
(3) Paraffin sulfonates having 8 to 22 carbon atoms, preferably 12 to 16 carbon atoms, in the alkyl moiety. These surfactants are commercially available as Hostapur SAS from Hoechst Celanese.
(4) Olefin sulfonates having 8 to 22 carbon atoms, preferably 12 to 16 carbon atoms. Most preferred is sodium C14-C16 olefin sulfonate, available as Bioterge AS 40.®.
(5) Alkyl ether sulfates derived from an alcohol having 8 to 22 carbon atoms, preferably 12 to 16 carbon atoms, ethoxylated with less than 30, preferably less than 12, moles of ethylene oxide. Most preferred is sodium lauryl ether sulfate formed from 2 moles average ethoxylation, commercially available as STEOL CS230 or Standopol ES-2.(R).
(6) Alkyl glyceryl ether sulfonates having 8 to 22 carbon atoms, preferably 12 to 16 carbon atoms, in the alkyl moiety.
(7) Fatty acid ester sulfonates of the formula: R1 CH(SO3—M+)CO2 R2 where R1 is straight or branched alkyl from about C8 to C18, preferably C12 to C16, and R2 is straight or branched alkyl from about C1 to C6, preferably primarily C1, and M+represents a mono- or divalent cation.
(8) Secondary alcohol sulfates having 6 to 18, preferably 8 to 16 carbon atoms.
(9) Fatty acyl isethionates having from 10 to 22 carbon atoms, with sodium cocoyl isethionate being preferred.
(10) Dialkyl sulfosuccinates wherein the alkyl groups range from 3 to 20 carbon atoms each.
(11) Alkanoyl sarcosinates corresponding to the formula RCON(CH3)CH2 CH2 CO2 M wherein R is alkyl or alkenyl of about 10 to about 20 carbon atoms and M is a water-soluble cation such as ammonium, sodium, potassium and trialkanolammonium. Most preferred is sodium lauroyl sarcosinate.
Nonionic Surfactants:
Co-surfactants are present in the inventive composition to aid in the foaming, detergency and mildness properties. At least one surfactant selected from a nonionic and amphoteric surfactants are the preferred co-surfactants. Suitable nonionic surfactants include C10-C20 fatty alcohol or acid hydrophobes condensed with from 2 to 100 moles of ethylene oxide or propylene oxide per mole of hydrophobe; C2-C10 alkyl phenols condensed with from 2 to 20 moles of alkylene oxides; mono- and di-fatty acid esters of ethylene glycol such as ethylene glycol distearate; fatty acid monoglyceride
Hayward Christine
Paredes Rosa
Bornstein Alan A.
Ogden Necholus
Unilever Home and Personal Care USA division of Conopco, Inc.
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