Patent Application
20100035781
The present invention relates to a composition which contains a mixture of alkoxylated mono-, di-, and triglycerides and glycerine, to a method for the preparation of said composition, the detergent compositions which contain said composition and to the use of said composition as surfactant or co-surfactant in detergent compositions, particularly in detergent compositions, especially, but not exclusively, suitable for washing fabrics, suitable for manual dishwashing, for washing the hair or for personal hygiene.
Most of the known detergent compounds use surfactants of anionic, amphoteric and/or non-ionic type to produce a final product which displays satisfactory properties in terms of detergence and foam profile. However, most of these compounds are not generally satisfactory due to the problem of ecotoxicity and irritation to the eyes and skin.
On the other hand, in a large number of applications where surfactants are used, consumers look for a large quantity of foam to be produced. For example, a shampoo that does not produce stable, creamy foam during the washing process is expected not to be well accepted in the market. The same applies to manual dishwashing, even when a direct relation cannot be formed between the foaming power and cleaning efficacy.
The main characteristics of the surfactant formulations related to foam which determine their use in areas such as personal hygiene and domestic cleaning, the food sector, fire-fighting, mineral flotation and many others are: foaming capability, foam stability (the foam remaining after a period of time), foam quantity (associated to a good cleaning effect), the creaminess of the foam (associated to conditioning effect), foam density, foam texture and speed of foaming (foam produced after a very short period of time). On the other hand, it is desirable that the foam is quickly produced (e.g. after a few seconds). Furthermore, the foam must tolerate hard water and the presence of oil and/or greases.
The number of combinations of surfactants which solve this complex requirement tends to be reduced, which explains why the same formulations are always on the market. One way of overcoming this problem would be to incorporate additives known as foaming amplifiers or re-enforcers.
On the other hand, the compositions which contain a mixture of alkoxylated mono-, di-, and triglycerides and glycerine are well known by persons skilled in the art.
Thus, patent application EP-A-0586323 discloses a detergent composition which displays improved properties with respect to ecotoxicity and irritation to the eyes and skin; said composition comprises the mono-, di- and triester compounds represented by formula (I), wherein the proportion by weight of mono-, di-, and triester is 46-90/9-30/1-15
On the other hand, patent application EP-A-1045021 discloses a composition which displays high viscosity and good foam stability, as well as good properties with respect to biodegradability and irritation to the eyes and skin, said composition comprises
Finally, patent application EP-A-1106675 discloses the use of ethoxylated partial glyceride products which consist of mixtures of ethoxylated partial glycerides of formula (IV)
Despite the fact that the compositions disclosed in EP-A-0586323, EP-A-1045021 and EP-A-1106675 have a certain foaming power, in certain cases, greater foaming is required. Therefore, in some cases, said compositions have been combined with other surfactants, such as, for example, ether carboxylic acids or their salts, as disclosed in patent application WO-A-2004104150. Nevertheless, said combination is not always possible depending on the field of application, especially when there are cationic surfactants in the medium, which may interact with the ether carboxylic acids or their salts. On the other hand, it is more versatile to have a single compound (composition in this case) which has all the above described advantages and, at the same time, is capable of producing a high quantity of foam without having to be combined with other compounds.
The present invention provides an effective solution to the problems mentioned in the state of the art, providing a composition which comprises
The methods for preparing said composition also form part of the object of the invention.
Another additional object of the present invention are the detergent compositions which contain said composition.
The use of said composition as surfactant or co-surfactant in detergent compositions also forms part of the object of the invention.
The use of said composition as amplifying or promoting agent of foaming in detergent compositions also forms part of the object of the invention.
The composition of the invention contains a mixture of alkoxylated mono-, di-, and triglycerides and glycerine.
Preferably, the proportion by weight of components (i)/(ii)/(iii) is 80-90/10-25/less than 6.
Preferably, in formula (1) R′ represents H, i.e. components (i), (ii), (iii) and (iv) are ethoxylated derivates.
Preferably, the sum of m, n and l is in the ranges of 2 to 15, even more preferably in the range over 5 and less than 9.
Preferably, the proportion by weight (i)+(ii)+(iii)/(iv) is in the range of 1.5:0.8 to 0.8:2.5, more preferred in the range of 1.3:0.9 to 0.9:2.3, even more preferred in the range of 1.2:1.0 to 1.0:2.0.
The compositions of the present invention can be prepared as described in patent application EP-A-1045021, i.e. by a first method that consists of the following stages:
The interesterification reaction of stage a) is governed by thermodynamics. Consequently, the molar proportion of components (i), (ii), (iii) and (iv) in the final product is determined by the proportion of starting materials, glycerine and the component of formula (2). The subsequent alkoxylation reaction of stage b) is a reaction which generally proceeds quantitatively, whereby the quantity of alkylene oxide used determines the degree of alkoxylation (i.e. the sum of m, n, and l). The molar proportion of components (i), (ii), (iii) and (iv) is not affected by alkoxylation, since the alkylene oxide only reacts with the free moieties of the hydroxyl groups of the mono- and diester and glycerine molecules. However, the proportion by weight of components (i), (ii), (iii) and (iv), consequently, changes. Despite the fact that the result of the reactions of stages a) and b) can be predicted by a person skilled in the art, it is possible to use model calculations to determine the correct proportion of the starting materials and thus obtain a proportion of predetermined and specific weights of components (i), (ii), (iii), and (iv) and a predetermined and specific degree of alkoxylation.
Furthermore, the compositions of the present invention can be produced by a second method which consists of the following stages:
R—CO—OR—X (3)
wherein R represents an alkyl or alkenyl group, linear or branched, of 6 to 11 carbon atoms and X represents a methyl group or H.
The component of formula (2) includes vegetable and animal oils and fats, as well as synthetic triglycerides, produced from esterification of fatty acids C6-C12 and glycerine.
Examples of fatty acids of general formula (3) or of their methyl esters which are condensed (transesterify) with a mixture of glycerine with alkylene oxide with 2 or 3 carbon atoms are fatty acids C6-C12 from vegetable and animal oils and fats, possibly totally or partially hydrogenated, as well as purified or synthetic fatty acids such as caproic acid (CH3 (CH2)4COOH), enanthic acid (CH3(CH2)5COOH), caprylic acid (CH3 (CH2)6COOH), pelargonic acid (CH3(CH2)7COOH), capric acid (CH3(CH2)8COOH), 2-ethyl caproic acid or 2-ethylhexanoic acid (CH3(CH2)3CH(C2H5)COOH), undecylic acid (CH3(CH2)9COOH), lauric acid (CH3(CH2)10COOH) or mixtures thereof.
Preferably, the fatty acids of general formula (3) their methyl esters, or the fatty acids that are esterified with glycerine to produce the component of formula (2), are selected from caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, 2-ethyl caproic acid, or mixtures thereof.
Preferably, the content of C11 in the acyl group represented by —CO—R of formula (1) is equal to or less than 5% by weight, even more preferably equal to or less than 2% by weight.
It is particularly preferred that in the acyl group represented by —CO—R of formula (1), R represents an alkyl or alkenyl group, linear or branched, of 6 to 9 carbon atoms.
The degree of alkoxylation of the final product (i.e. the sum of m, n, and l) is determined by the quantity of alkylene oxide used in stage a′). Next, stage b) determines the molar proportion and the proportion by weight of components (i), (ii), (iii), and (iv). As before, the result of the reactions of stages a′) and b′) can be predicted by a person skilled in the art, so that it is possible to use model calculations to determine the correct proportion of starting materials and thus obtained a predetermined and specific proportion by weight of components (i), (ii), (iii) and (iv) and a predetermined and specific degree of alkoxylation.
The component of formula (iv) is preferably produced from one of the fats or oils used, preferably, in the first method of the present invention and which have been previously stated.
Another additional object of the present invention is the detergent compositions which contain the compositions of the invention (mixture of alkoxylated mono-, di-, and triglycerides and glycerine)
The composition of the present invention is used, preferably, as surfactant or co-surfactant in detergent compositions wherein, preferably, they are contained in quantities which range from 0.25 and 20% by weight, although more preferably between 0.5 and 8% by weight.
The detergent compounds of the present invention may, additionally, contain one or more of the following additives, depending on the objective of the detergent compound, without this being a limited list:
1. Anionic surfactants such as sodium alkyl ether sulfate, ammonium alkyl ether sulfate, triethanolamine alkyl ether sulfate, sodium alkyl sulfate, ammonium alkyl sulfate, triethanolamine alkyl sulfate, sodium alkyl sulfonate, sodium alkene sulfonate such as sodium alpha olefin sulfonate, sodium alkane sulfonate, sodium alkyl aryl sulfonate such as alkyl benzene sulfonate, sulfosuccinates, and sulfosuccinamates.
2. Fatty acids or soaps derived from natural or synthetic substances such as coconut, oleic, soy and tallow fatty acids.
3. Ethoxylated alcohols.
4. Fatty acid esters derived from natural or synthetic substances such as glycol, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, sucrose, glucose or polyglycerine.
5. Ethoxylated esters of fatty acids such as hydroxy-type fatty acids.
6. Amphoteric surfactants such as alkyl amidopropyl betaine, alkyl betaine, alkyl amidopropyl sulfobetaine, alkyl sulfobetaine, cocoamphoacetates and cocoamphodiacetates.
7. Amine oxides such as dimethyl alkylamine oxides or alkyl amidopropylamine oxides.
8. Amides such as monoethanolamides, diethanolamides, ethoxylated amides or alkyl isopropanol amides.
9. Alkylpolyglycosides.
10. Alcohol ether carboxylates, ethoxylated fatty alcohols.
11. Cationic surfactants such as alkyl benzyl dimethyl ammonium halides, alkyl trimethyl ammonium halides, quaternized ethoxylated amines, esterquats derived from triethanolamine, methyldiethanolamine, dimethylamine propanediol and oligomers of said esterquats.
12. Additives to improve said formulations such as thickeners, pearling agents, opacifiers, antioxidants, preservatives, colouring agents or perfumes.
Particularly preferred are detergent compositions for washing fabrics, for manual dishwashing, for washing the hair or for personal hygiene, which contain the compositions according to the present invention, particularly detergent compositions for manual dishwashing.
The use of said compositions as surfactant or co-surfactant in detergent compositions also forms part of the object of the invention, particularly in detergent compositions for washing fabrics, for manual dishwashing, for washing the hair or for personal hygiene.
The use of said compositions as amplifying or promoting agents of foaming in detergent compositions also forms part of the object of the invention, particularly in detergent compositions for washing fabrics, for manual dishwashing, for washing the hair or for personal hygiene.
The following examples are given for the purposes of providing a person skilled in the art with a sufficiently clear and complete explanation of the present invention, but they should not be considered as limitations to the essential aspects of the object thereof, as has been stated in the previous paragraphs of this description.
The mixtures of alkoxylated mono-, di-, and triglycerides and glycerine of Table 1 were prepared in accordance with the procedure described in the examples of patent application EP-A-1045021.
The dishwashing compositions of Table 3 were prepared, as indicated in Table 2.
1EMAL ® 270E (70% of active material with an average degree of ethoxylation of 2) marketed by Kao Chemicals Europe
2OXIDET ® DMCL-D (coconut-alkyldimethylamine oxide, 30% of active material) marketed by Kao Chemicals Europe
3As described in Table 3
The evaluation of the different compositions was carried out from the determination of the foaming power in the presence of grease (olive oil), according to the following procedure.
The foam volume of an aqueous solution of the product to be tested was determined at a concentration of 0.4 g/L (active product), at a water hardness of 20° HF (French degrees) and at a temperature of 40° C.
The measurements were carried out using a “SITA Foam Tester R-2000” stirrer (supplied by SITA Messtechnik GmbH), working at 1500 rpm, in stirring cycles of 10 seconds.
The foam volume was measured between each stirring cycle and 50 μL of grease (olive oil) were added.
When the foam volume (y-axis) is represented against the number of oil additions (x-axis), a parabolic-type curve is obtained, with a maximum for the foam value.
To compare the behaviour of the different products, the following curve parameters are taken into consideration:
The results of the evaluation are shown in Table 3.
1NEODOL ® 91-9 (ethoxylated alcohol C9-C11 with an average degree of ethoxylation of 9) from Shell Chemicals
1PLANTAREN ® 2000 (Decyl polyglucoside) from Cognis Iberia SL/Cognis Deutschland GmbH & Co. KG
The dishwashing compositions prepared in accordance with the invention (A-B) have a maximum foam volume and number of theoretical plates higher than that of the dishwashing compositions prepared with the comparative examples (C1-C7).
The dishwashing compositions were prepared as indicated in Table 4.
1EMAL ® 270E (70% of active material with an average degree of ethoxylation of 2) marketed by Kao Chemicals Europe
2OXIDET ® DMCL-D (coconut-alkyldimethylamine oxide, 30% of active material) marketed by Kao Chemicals Europe
3FINDET ® HEX-16 (2-ethylhexanol and average degree of ethoxylation of 4) produced by Kao Chemicals Europe
From the experimental results it can be concluded that the fact of adding a second type of non-ionic surfactant (of the branched alcohol type with 8 carbon atoms and with an average degree of propoxylation of 4) causes an increase in the maximum foam volume and the number of theoretical plates, both in the dishwashing compositions which include the compositions in accordance with the invention (C and D) as well as in the dishwashing compositions which include the comparative examples (C8 and C9).
Despite the increases observed in the comparative examples, the maximum foam volume and the number of theoretical plates continues to be considerably lower than the results obtained by the dishwashing composition that only includes the composition of alkoxylated mono-, di-, and triglycerides and glycerine in accordance with the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| P200601535 | Jun 2006 | ES | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2007/053271 | 4/3/2007 | WO | 00 | 7/14/2009 |
