Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2000-09-20
2002-12-03
Delcotto, Gregory (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S119000, C510S130000, C510S128000, C510S137000, C510S138000, C510S158000, C510S159000, C510S417000, C510S418000, C510S505000, C510S506000
Reexamination Certificate
active
06489275
ABSTRACT:
The present invention relates to an agent for cleansing the skin, containing a liquid natural and/or synthetic water-based latex emulsion excluding styrene-butadiene latices, exclusively at least one organic solvent which has a lower volatility than ethanol and a boiling point >78.32° C., and water.
Agents for cleansing the skin, and particularly so-called hand washing pastes with which the dirt is removed without the addition of water, have been familiar for some time. Since with these agents the skin does not have to be rinsed with water after cleansing, there is no need to use a drying cloth.
Well-known from DD 272 099 is a washing paste for the cleansing of oil- and grease-soiled hands which does not require the use of water. The hand washing paste contains 1-3% of an aqueous copolymerizate latex consisting of styrene, 1,3-butadiene, methacrylic acid and a esterification product of the Diels-Alder adducts of maleic acid.
WO 00/17300 teaches a skin cleansing agent, which consists of a latex emulsion, an organosilicone compound, emollients, surface-active agents and water. The latex emulsion preferably has a styrene-butadiene copolymer.
The disadvantage of the above-mentioned skin cleansing agents is that they only have limited skin compatibility, are not toxicologically safe and/or pose environmental risks.
The object is therefore to provide a skin cleansing agent which is toxicologically safe, skin-compatible and less harmful to the environment without adversely affecting the cleansing performance.
According to the invention, said object is accomplished by an agent for cleansing the skin which contains a liquid natural and/or synthetic water-based latex emulsion excluding styrene-butadiene latices, exclusively at least one organic solvent which has a lower volatility than ethanol and a boiling point >78.32° C., and water.
According to the invention, the agent for cleansing the skin contains a liquid natural and/or synthetic water-based latex emulsion excluding styrene-butadiene latices. Latex emulsions in the meaning of the invention are dispersions of finely distributed natural and/or synthetic polymers in an essentially aqueous dispersing agent. The polymers comprise natural and synthetic rubber, synthetic resins and/or plastics such as polymerisates, polycondensates and polyaddition compounds. The diameter of the polymer particles preferably is from 0.05 to 5 &mgr;m.
In a preferred embodiment, the agent for cleansing the skin according to the invention contains:
a) 10-80% by weight of a liquid natural and/or synthetic water-based latex emulsion,
b) 1-15% by weight of an organic solvent having a lower volatility than ethanol and a boiling point >78.32° C.,
c) 0-10% by weight of at least one surfactant, preferably at least one fatty alcohol ethoxylate, fatty alcohol ether sulphate, succinate, sarcoside and/or glucoside,
d) 0-10% by weight abrasives, preferably bleached walnut shell meal and/or non-swellable starch,
e) 0-0.1% by weight thickener,
f) optionally, cosmetic adjuvants and additives and/or active ingredients,
g) 10-60% by weight water,
to make a total of 100% by weight.
According to the invention, the agent for cleansing the skin contains an organic solvent with a lower volatility than ethanol and a boiling point >78.32° C., the boiling point being measured at a pressure of 1.013 bar. The solvent is preferably at least one
polyhydric alcohol or derivative of a polyhydric alcohol, particularly a polydiol, preferably an alkylene glycol, a polyalkylene glycol, a polydiol derivative, and preferably a polyalkylene glycol ether and/or polyalkylene glycol ester,
mono- or polyester of a saturated or unsaturated mono- or polyvalent carboxylic acid with 2 to 30 carbon atoms with n- and isoalkanols with 2 to 10 carbon atoms, preferably a diester of aliphatic and/or aromatic di- and/or tricarboxylic acids, and/or
aliphatic hydrocarbon with 12 to 22 carbon atoms, preferably with 16 to 20 carbon atoms and particularly preferably isohexadecane,
or a mixture of at least two of the above-mentioned substances.
Preferred polyalkylene glycols or their esters or ethers are listed in the tables from Ullmann, 4th edition, volume 8, pages 200, 204, 205, 207 and volume 19, pages 426 and 428. These tables are hereby incorporated by reference and are thus deemed part of the disclosure.
Dipropylene glycol monomethyl ether is particularly preferred as solvent.
In a preferred embodiment of the present invention, the polymer in the water-based latex emulsion is polyisoprene, which preferably has a cis-1,4 content of at least 90%. The latex emulsion preferably has a solids content of 50 to 80 and especially preferably 60 to 70% by weight. The particle size of the polyisoprene is preferably 1.8 &mgr;m maximum.
The ratio of latex emulsion to solvent is preferably 8:1 to 1:1, and particularly preferably 4:1 to 2:1. These ratios apply extremely preferably if a polyisoprene emulsion is employed as the latex emulsion.
The agent for cleansing the skin can possibly contain a surfactant. This surfactant is preferably a fatty alcohol ethoxylate of general formula: R—O—(CH
2
—CH
2
—O)
n
with R=C
8-18
and n=1-8, preferably R=C
12-14
and n=4-6. The surfactant is also preferably a fatty alcohol ether sulfate of general formula: R—O—(CH
2
—CH
2
—O)
n
SO
4
X
2
with R=C
10-16
and n=1-4 and X=Na
+
, K
+
, ½ Mg
2+
or NH
4
+
.
The agent for cleansing the skin preferably contains at least one abrasive. The abrasives can be conventional abrasives or mixtures thereof, and preferably bleached walnut shell meal, non-swellable starch or a mixture thereof.
To modify the consistency of the agent for cleansing the skin according to the invention, the latter can also contain water-swellable polymers as thickeners, where polymers and copolymers obtainable from the polymerization of acrylic acid optionally with other acrylic acid derivatives as comonomers preferably are employed.
The agent for cleansing the skin according to the invention can contain cosmetic adjuvants or additives and/or active ingredients, e.g. care derivatives, emollients, perfume (fragrances), preservatives, etc.
The advantage of the agent for cleansing the skin according to the invention is that it is toxicologically safe and less harmful to the environment. The cleansing performance of the agent for cleansing the skin according to the invention corresponds to those of the prior art. The agent for cleansing the skin according to the invention can be employed in painting installations.
The agent for cleansing the skin according to the invention is particularly suitable as a washing paste. The invention therefore is also directed to the use of the agent for cleansing the skin according to the invention as a washing paste and particularly as a hand washing paste.
The advantage of the use according to the invention is that it is toxicologically safe and less harmful to the environment. The cleansing performance of the agent for cleansing the skin according to the invention corresponds to those of the prior art. The use according to the invention can be beneficially practised in painting installations.
Another object of the present invention is a method for cleansing the skin in which the agent according to the invention is applied to the skin and distributed by rubbing in order to form particles which fall from the hand during further rubbing. The rubbing, for instance when cleansing the hands, takes 10 to 60 seconds and preferably 10 to 30 seconds.
The advantage of the method according to the invention is that it is toxicologically safe and less harmful to the environment. The cleansing performance of the agent for cleansing the skin according to the invention corresponds to those of the prior art. The process according to the invention can be employed in assembly plants, workshops and painting installations, whereby wetting problems on material surfaces are largely avoided.
The invention will be explained below with reference to the Examples. These explanations m
Klotz Andreas
Nauels Bernd
Veeger Marcel
Delcotto Gregory
Stockhausen GmbH & Co. KG
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