Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – With halogen – nitrogen – oxygen – or phosphorus containing...
Reexamination Certificate
2000-01-07
2001-11-27
Lovering, Richard D. (Department: 1712)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
With halogen, nitrogen, oxygen, or phosphorus containing...
C424S405000, C510S365000, C510S417000, C510S488000, C510S504000, C516S067000, C516S069000
Reexamination Certificate
active
06323171
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to an improved multi purpose liquid cleaner in a microemulsion form, to be used neat, in particular for cleaning and disinfecting hard surfaces and which is effective in sanitizing surfaces, in removing grease soil and also dries fast leaving the surfaces streak free.
BACKGROUND OF THE INVENTION
Disinfectant composition based on cationic and nonionic are well known. However, these compositions while very efficient in disinfecting surfaces, generally do not remove grease and oil as desired; hence, leaving residues and streaks on surfaces. Addition of an efficient anionic surfactant cleaner, to the cationic surfactant, either creates instability problems or deactivates the disinfectant behavior of the cationic. Anionic and nonionic mixtures have a good grease removal properties, but do not perform at all to sanitize the surface being cleaned.
SUMMARY OF THE INVENTION
The instant compositions exhibit good grease removal properties combined with excellent disinfecting properties and the compositions do not leave streak or residue on the surface being cleaned.
The described compositions are to be used mainly neat in a spray form. The compositions contain a lower level of surfactant than current all purpose cleaning compositions and have a richer level of solvent than surfactant. In order to have a product which leaves the surfaces shiny after cleaning, the instant compositions are builder free.
The instant compositions teach that combination of amine oxide nonionic surfactant, at least one fatty alcohol nonionic surfactant and cationic surfactant have better grease removal properties while maintaining the disinfecting efficacy. This improvement is linked to the fact that the instant compositions are microemulsion.
One particular grade of amine oxide (Tomah's AO14-2) has been found to reduce streaks induced by nonionic surfactant. Amine oxide nonionic surfactants are however expensive and have to be free of nitrosamine to allow their usage.
A more cost effective way than using amine oxide surfactant has been to use an amphoteric surfactant in combination with a fatty alcohol nonionic surfactant and with a cationic. Alkylaminocarboxylate surfactant at pH 7 to 10 will exhibit a behavior similar to a composition of anionic surfactant, in combination with nonionic surfactant which have an excellent grease removal efficacy. The amphoteric surfactant will not react with the cationic surfactant and some amphoteric surfactants have even demonstrated a disinfecting action which becomes cumulative with the cationic bactericidal effect. Some amphoteric are known to alter the bacteria cell membrane and allow a better efficacy of the bactericide.
Cationic surfactants have demonstrated different grease removal efficacy depending on their structure. Alkyl dimethyl benzyl quaternary ammonium exhibits good grease and fat removal but will leave residue on surfaces. Di-alkyl dimethyl quaternary ammonium, while still having good grease removal efficiency, have been found to significantly reduce the residues and streaks when used in combination with a fatty alcohol nonionic and an amphoteric surfactant.
A safe solvent system used in the instant compositions which has been found effective are glycol ethers such as propylene glycol butyl ether (PNB) alone or in combination with ethanol. PNB brings a significant benefit in degreasing performance and also promotes a fast drying out of the surface which has been cleaned. Oily material such as essential oil or perfume, when added to a composition, usually increase the streaks on surfaces.
The combination of a glycol ether with the surfactant system of the present invention allows a faster water film dry out time than obtained with current commercial spray formulations. It is important to select the perfume such as an essential oil not only to satisfy the cosmetic and the marketing needs, but also to have a minimum of residue left on the surface being cleaned. The selection of essential oils is also important because not only they will communicate the efficacy of the product to the consumer but also because they are effective bactericide.
In one aspect, the invention generally provides a stable, clear multi purpose, microemulsion hard surface cleaning composition especially effective in disinfecting the surface being cleaned and in the removal of oily and greasy oil while a fast dry out time and without leaving streaks on the surface being cleaned. The microemulsion compositions include approximately, on a weight basis:
from 0.1% to 20% of at least nonionic surfactant;
from 0.1% to 20% of at least one disinfecting agent such as cationic surfactant such as dimethyl dialkyl ammonium chloride such as the Bardac 2170 or 2180 or Barduc 22 and/or a mixture of dialkyl dimethyl ammonium chloride and an alkyl benzyl ammonium chloride such as Barquat MB-50 (Lonza) or Protectol KLC-50 (BASF);
from 0.1% to 20% of at least amphoteric surfactant;
0.1% to 8% of at least a water soluble solvent;
0.1% to 3.0%, more preferably 0.2% to 2% of a perfume, water insoluble organic compound or essential oil; and
the balance being water, wherein the composition is not a liquid crystal and the composition has a storage modulus at 25° C. less than 0.2 Pascal when measured at a frequency of ten radian per second and a strain of 0.01% and the composition does not contain an anionic surfactant containing sulfonate, sulfate or carboxylate groups and the composition also does not contain a pyrrolidone compound such as N-methyl pyrrolidone and the composition also does not contain a grease release agent such as an ethoxylated maleic anhydride-alpha-olefin copolymer.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a stable hard surface microemulsion cleaning composition approximately by weight:
0.1% to 20% of at least one nonionic surfactant;
0.1% to 20% of at least one disinfecting agent such as a cationic surfactant,
0.1% to 20% of an amphoteric surfactant,
0.1% to 8% of at least one water soluble solvent;
0.1% to 3.0%, more preferably 0.2% to 2% of a water insoluble organic compound, essential oil, or a perfume, and
the balance being water, wherein the composition is not a liquid crystal and the composition at 25° C. has a storage modulus of less than 0.2 Pascals at a frequency of 10 radians per second and a strain or 0.01% and the composition does not contain an anionic surfactant containing sulfonate, sulfate or carboxylate groups and the composition also does not contain a pyrrolidone compound such as N-methyl pyrrolidone and the composition also does not contain a grease release agent such as an ethoxylated maleic anhydride-alpha-olefin copolymer.
As used herein and in the appended claims the term “perfume” is used in its ordinary sense to refer to and include any non-water soluble fragrant substance or mixture of substances including natural (i.e., obtained by extraction of flower, herb, blossom or plant), artificial (i.e., mixture of natural oils or oil constituents) and synthetically produced substance) odoriferous substances. Typically, perfumes are complex mixtures of blends of various organic compounds such as alcohols, aldehydes, ethers, aromatic compounds and varying amounts of essential oils (e.g., terpenes) such as from 0% to 80%, usually from 10% to 70% by weight, the essential oils themselves being volatile odoriferous compounds and also serving to dissolve the other components of the perfume.
In the present invention the precise composition of the perfume is of no particular consequence to cleaning performance so long as it meets the criteria of water immiscibility and having a pleasing odor. Naturally, of course, especially for cleaning compositions intended for use in the home, the perfume, as well as all other ingredients, should be cosmetically acceptable, i.e., non-toxic, hypoallergenic, etc.
The water insoluble organic compound, essential oil or perfume is present in the composition in an amount of from 0.1% to 3% by weight, preferably from 0.2% to 2% by weight.
Furthermore, although superior gr
Burke Julie
Dormal Didier
Fonsny Pierre
Colgate-Palmolive Co
Lovering Richard D.
Nanfeldt Richard E.
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