MXPA97002100A

MXPA97002100A - Hard surface cleaners for better brightness

Info

Publication number: MXPA97002100A
Application number: MXPA/A/1997/002100A
Authority: MX
Inventors: Rosalia Joannes Geboes Peter; Francois Theophile Evers Marc; Margherita Romano Roberta
Original assignee: The Procter & Gamble Company
Priority date: 1994-09-20
Filing date: 1997-03-19
Publication date: 1997-06-01

Abstract

The use of magnesium ions in cleaning compositions for hard surfaces consisting of an anionic surfactant system is described, wherein the residuality of said compositions on said surfaces is reduced, while the cleaning capacity is maintained; Compositions according to the present invention are designed to allow the formation of in situ complex of magnesium ions that are present in the water, either during manufacture or during the

Description

HARD SURFACE CLEANERS IMPROVED BRIGHTNESS STOP TECHNICAL FIELD The present invention relates to the cleaning of hard surfaces, especially glossy surfaces.

BACKGROUND OF THE INVENTION Compositions for cleaning hard surfaces are extensively described in the art. It is desirable that such compositions have, in particular, the ability to provide a good shine to the cleaned surfaces. However, the surface gloss is commonly compromised by the residues of the compositions that are left on said surfaces and which appear in the form of lines upon complete evaporation of the water. The phenomenon of line formation caused by the residuality of a composition tends to be more of a problem since said composition is formulated as a concentrate, ie it consists of more active ingredients and less water. Also, for a given composition, the residuality of said composition is even more remarkable since said composition is used to clean surfaces made of glossy materials, such as ceramic mosaics, windows and glossy mirrors or such materials as PVC coated with polyurethane, the which is widely used in North America. Likewise, many current products are formulated or can be used as non-rinsing products. This problem of residuality tends to be more acute for such products or in such conditions, since the rinsing step carried out for other products can not participate here to decrease the residuality. It is therefore an object of the present invention to provide an improved gloss to hard surfaces, in a manner that is applicable to a variety of cleaning compositions and to a variety of surfaces. Various solutions in the art have been proposed to satisfy this object, including the use of certain solvents or the formulation of combinations of specific ingredients. In the co-pending application EP-A-93202452.4, the discovery was disclosed that this object can be achieved by formulating a composition consisting of an anionic surfactant system and an effective amount of magnesium ions as counterions for said anionic surfactants. In other words, for any cleaning composition that consists of an anionic surfactant system and that causes debris to appear on the cleaned surfaces, adding an appropriate amount of magnesium ions will cause the debris to appear less or even appear no longer. . Cleaning compositions consisting of magnesium ions have been extensively described in the art, mainly in the context of dishwashing, for example in WO-R-9 206 171, UO-P-9 20 & L56, US-A-4 129 515, GB-ft-2 078 246, EP-A-0 107 946, EP-A-0 062 371, FR-A-2 324 723, FR-A-2 296 688, EP 125 711, GB 2 144 763 and GB 2 078 246, but the derivable benefits thereof in terms of low resi uality have never been recognized. However, the technology described in the '452 application has certain disadvantages. A first disadvantage is that it requires the specific addition of magnesium for this sole purpose. In fact, adding magnesium to the finished product for this sole purpose is not economically attractive. As an alternative, anionic surfactants neutralized with magnesium ions could be used, but this is also more expensive than using the traditional sodium salts of the anionic surfactants. Another disadvantage is that when the product is to be formulated at a higher pH, typically 9 and more, adding magnesium salts would inevitably lead to the formation and precipitation of magnesium hydroxide in the finished product. It has now been discovered that the brightness benefits derivable from the magnesium ions can be obtained, without adding magnesium, in any form, in the compositions. It has been discovered that the magnesium ions that are naturally present in tap water can be used to provide this benefit, formulating compositions with which the magnesium ions can be complexed in situ, under contact with water. It has been found that the compositions according to the present invention are specifically suitable for use in pure and diluted use. In fact, the benefits of gloss have also been observed in pure use (ie, when the composition is not diluted before use). In this pure use mode, the composition needs to be rinsed from the cleaned surface, and it is speculated that it is under the rinsing that magnesium complex formation occurs. In diluted use, complex formation occurs. In this way, the compositions herein are especially suitable for pure or diluted use. The compositions herein are preferably used in the diluted form, but also perform well in the undiluted form, i.e., the pure form, which is typically required for more difficult soils such as those on stove surfaces. It has also been discovered that the pure fat cleansing ability of the compositions herein is not affected by the dilution in the concentration scale of the present.

BRIEF DESCRIPTION OF THE INVENTION The present invention encompasses cleaning compositions for hard surfaces which consist of an anionic surfactant with magnesium ions in complex and said compositions are concentrated with water containing magnesium ions. The present invention also encompasses concentrated and diluted aqueous compositions consisting of a short chain surfactant, a long chain anionic surfactant and a hydrotrope at selected ratios. The present invention also encompasses methods for using said composition.

DETAILED DESCRIPTION OF THE INVENTION The compositions of the present invention improve the gloss on the surfaces in which they are applied since they reduce the residuality of the hard surface cleaning compositions. As used herein, the word "residuality" refers to the propensity of a composition to leave visible residues on a given surface. A composition with high residuality is a composition that leaves residues substantially visible on surfaces and which is therefore unfit for use in a non-rinsed form. The residuality of a composition according to the conditions of use can be evaluated by measuring the lustrous character of a surface cleaned with said composition, for example using a lustrornetro, or visually by a panel of expert judges.

The present invention is based on the discovery that, in compositions consisting of an anionic surfactant, the use of magnesium ions as counterions for said anionic surfactant system will reduce the reequality of said compositions. This phenomenon of reduction of residuality, that is, the reduction of the visibility of waste, but not necessarily the amount of waste, is clearly visible by the eye, and can be quantified by measuring the lustrous character of a certain surface cleaned with a composition of the present invention. In hard surface cleaning compositions in accordance with the present invention, the magnesium ions are complexed in situ, and a composition according to the present invention is contacted with magnesium ions in water, either before use or rinsing after use. It has been found that in a preferred embodiment of the present, there are three essential constituents required to obtain the magnesium complex formation in situ, while ensuring a good cleaning capacity of pure fat: these are a short chain anionic surfactant , a long chain anionic surfactant and a hydrotrope, in specific proportions. All percentages herein are by weight of the total composition, unless otherwise specified. Accordingly, the compositions of the present invention are aqueous compositions, which consist of from 40% to 97% water, preferably from 50% to 95%. It is highly preferable to use demineralized water to make the compositions herein, to avoid the problems generally associated with the use of "water to to" in the manufacturing step, typically precipitation or material damage depending on the formulation parameters. However, if tap water is used during manufacture, said water is generally sufficient to supply the magnesium ions that are complexed in situ (in this case) during manufacture. The compositions of the present invention consist of a short chain anionic surfactant and a long chain anionic surfactant. Suitable anionic surfactants for use herein include those well known in the art, ie, alkyl phosphates, ether alkyl sulphates, alkylsulfonates, alkylbenzene sulphonates, alkyl succinates, alkylcarboxylates, ether alkylcarboxylates, alkyl sarcosinates, alkylsulfo succinatoes, and the like. As used in the present, the term "short chain anionic surfactant" refers to a surfactant as described above, wherein the alkyl chain has from 6 to 10 carbon atoms or mixtures thereof. Preferred short chain anionic surfactants for use herein are those wherein the alkyl chain has 8 carbon atoms, as well as mixtures of two short chain anionic surfactants wherein one has 7 carbon atoms and the another has 9 carbon atoms. Also, it has been found to be preferred that the short chain surfactants are of the sulfate type, as opposed to the sulfonate, preferably an alkyl sulfate. The short chain anionic surfactants are commercially available, for example, from Rhone Poulenc under the trade name Rhodapon <; R > , or from Uitco under the trade name Witconafe < R > . As used herein, the term "long chain anionic surfactant" refers to a surfactant as described above, wherein the alkyl chain has from 10 to 20 carbon atoms, or mixtures thereof. . Of course, if the short chain has 10 carbon atoms, then the long chain must have a rnáe of 10 carbon atoms. Preferred long chain anionic surfactants for use herein are those in which the alkyl chain has from 12 to 16 carbon atoms. It has also been found to be preferred that the long chain surfactants herein are of the sulfonate type, as opposed to the sulfate, preferably an alkyl sulfonate, most preferably a secondary sulfonate. Suitable long chain anionic surfactants are commercially available from Hoechst under the trade name Hostapur < ), or from H? ls under the trade name MARLON < ). Both anionic surfactants can be conveniently provided to the composition in the form of neutralized salts, with any conventional commercially available counter-ion, typically Na, K, Li, NH 4 or alkanolarnin. As mentioned in the background of the present, it is a benefit to the present invention that this allows not to use magnesium salts of anionic surfactants, which are expensive in manufacturing. From this economic point of view, it is highly preferable to use sodium salts of anionic surfactants. The short chain anionic surfactants and the long chain anionic surfactants herein may be provided with identical or different counterions. In accordance with the present invention, it is essential that the long chain surfactant and the short chain surfactant are present on a defined ratio scale, namely from 1: 0.1 to 1: 4 (long chain to short chain), preferably from 1: 0.5 to 1: 2. Also, the compositions herein typically consist of 0.2% to 8% of said short chain anionic surfactant, preferably 0.5% to 4%, and 0.5% to 10% of said long chain anionic surfactant, preferably 2%. % to 5%. The compositions herein may additionally consist of additional surfactants, including nonionic surfactants, typically alkylalkoxylate and zwitterionic surfactants, preferably nonionic surfactants. Co or another essential ingredient, the compositions herein should consist of a hydrophobe. Hydrophobes for use herein include branched or linear C 1 -C 4 alkylbenzenesulfonates. Hydrothopes suitable for use herein are commercially available from Hüls under the trade name Na Cumol Sulfonat, or from Manro under the trade name SCS 40. Preferred for use herein are the eumeno sulfonates and xylene sulfonates, preferably their sodium salts. The co-positions of the present may consist of 0.5% to 5% of said hydrotrope, preferably 1% 4%. However, it is essential that the hydrotrope be present in a certain ratio scale to said short chain anionic surfactant, namely 0.05: 1 to 40: 1, most preferably 0.25: 1 to 4: 1. The compositions herein can be formulated in a variety of pH scales, on the pKs of the anionic surfactants, otherwise, said anionic surfactants become protonated, and can no longer effectively complex the magnesium. Also, as mentioned in the background hereof, the present invention is particularly useful for compositions formulated at a pH of about 9, wherein the magnesium sulfate would precipitate as magnesium hydroxide if it were simply added onto the finished product. In this way, the compositions herein are formulated at a pH of 9 or more, preferably from 9 to 12, preferably 10 to 11. The compositions herein may further consist of a variety of other ingredients including, detergency statement as carbonates, citrates, alkaloamines, solvents, bleaches, enzymes, dyes, perfumes and other aesthetics. The present invention also encompasses methods for using the compositions herein. In a first method, generally referred to as "diluted use", a composition in accordance with the present invention is diluted in water, wherein the magnesium ions of the dilution water are formed in in situ complex, before being applied on a hard surface. In a second method, generally referred to as "pure use", a composition in accordance with the present invention is applied on a hard surface without being diluted, and subsequently rinsed from said surface with water wherein the magnesium ions of the water of Rinse are formed in complex in situ. Another less preferred method of the present invention is a method of manufacturing a composition according to the present invention, wherein the ingredients constituting the composition are mixed with water, ie the "processing water" containing magnesium ions. , where the magnesium water of the processing water is formed in complex in situ. As explained briefly herein, this method requires the use of tap water as opposed to demineralized water. This method allows the in situ complex formation of magnesium, but in some cases it can lead to precipitation phenomena. The present invention is further illustrated by the following examples.

EXAMPLES-EXPERIMENTS The following compositions were made by mixing the ingredients listed in the proportions listed. Subsequently, they were diluted and used to clean several mosaics. The experiment was carried out with distilled water (without magnesium), mild water (3 gpg) and hard water (20 gpg). The brightness, that is, the residuality, was evaluated visually and graduated by a panel of four expert judges, using three replications per composition and dilution condition. The results are expressed as panel score units (psu) from 1 to 4 when the brightness is improved.

NaParafinosu1 fonate 3 3 1.5 1.5 4 C8 alkylsulfate 2 2 1 1 2 1.5 C7-ll (EO) 6 8 10 4 5 6 C13-15 (EO) 30 5 4 2.5 2 - C12-13 (EO) 3 3 4 1.5 2 - Fatty acid palm seed 0.5 0.5 0.2 0.2 - Naphonate sulfonate eumeno 3 3 1.5 1.5 2 Xylene sulfonate K2C03 MEA 2 PH 10.5 10.5 10.5 10.5 11 11 Water / lower balance- Results: 1 2 3 4 psu psu psu psu Desalted water to re f. ref. ref. ref. Soft water (3 pgp) + 1 + 1.2 +1.2 +1.0 Hard water (20 gpg) + 2 +2.2 +2.0 +2.5 These results show that the benefit of brightness is obtained only when the dilution water contains magnesium and the brightness improves when the hardness of the water increases.

Claims

NOVELTY OF THE INVENTION CLAIMS

1. A composition for cleaning hard surfaces consisting of an anionic surfactant, which complexes magnesium ions when said composition is contacted with water consisting of magnesium ions.

2. A composition according to claim 1, which is aqueous, has a pH of about 9, consists of a short-chain anionic surfactant consisting of an alkyl chain of C6-C1, an anionic surfactant of long chain consisting of an alkyl chain of C 10-20 and a hydrotrope, in weight ratios of said long chain anionic surfactant to said short chain anionic surfactant of from about 1: 0.1 to about 1: 4, and said short chain anionic surfactant to said hydrotho of from about 1: 0.05 to about 1: 4.

3. A composition according to claim 2, further characterized in that said ratios are, respectively, approximately 1: 0.5 to approximately 1: 2 and approximately 1: 0.25 approximately 1: 4.

4. A composition according to claim 2, further comprising from about 0.2% to about 8% of said short chain anionic surfactant consisting of an alkyl chain of C6-10.

5. A composition according to claim 4, which consists of from about 0.5% to about 4% of said short chain anionic surfactant consisting of an alkyl chain of C6-10.

6. A composition according to claim 2, which consists of from about 0.5% to about 10% of said long chain anionic surfactant consisting of an alkyl Clü-20 chain.

7. A composition according to claim 6, which consists of from about 2% to about 5% of said long chain anionic surfactant consisting of an alkyl chain of C10-20.

8. A composition according to claim 2, which connects from about 0.5% to about 5% of said hydrotop.

9. A composition according to claim 8, further comprising from about 1% to about 4% of said hydrotop.

10. A composition according to claim 2, further characterized in that said short chain anionic surfactant is a C6-10 alkyl sulfate.

11. A composition according to claim 2, further characterized in that said long chain anionic surfactant is a C10-20 alkyl sulfonate.

12. A composition according to claim 2, further comprising from about 40% to about 97% water.

13. A composition according to claim 12, further comprising from about 50% to about 95% water.

14. A composition according to claim 13 consisting of from about 65% about 90% water.

15. A composition according to claim 2 having a pH of from about 9 to about 12.

16. A composition according to claim 15, having a pH of from about 1.0 about 11.

17. A method for manufacturing a composition according to claims 1 and 2, further characterized in that the ingredients constituting the composition are mixed, wherein the magnesium water of said water is complexed in situ.

18. A method of using a composition according to claims 1 and 2, further characterized in that said composition is diluted in water, wherein the magnesium ions of said water are formed in complex in situ, before being applied on a hard surface.

19. - A method according to claim 18, further characterized in that a composition according to claims 1 and 2 is applied on a hard surface without having been diluted, and subsequently rinsed from said surface with water, wherein the magnesium ions of said water are formed in complex in situ.

20. A method according to claim 18, further characterized in that said surface is not rinsed after said composition has been applied.