Patent Application
20210154117
The present invention relates to an esteramine salt according to the general formula (I):
The substituents R1, R2 and R3 are defined below.
The present invention further relates to a process for preparing such an esteramine salt according to general formula (I), wherein a corresponding monocarboxylic acid or an ester thereof are reacted with an aminoalcohol and an at least equimolar amount of a sulfonic acid.
Due to the increasing popularity of easy-care fabrics made of synthetic fibers as well as the increasing energy costs and growing ecological concerns of detergent users, the once popular hot water wash has now taken a back seat to washing fabrics in cold water. Many commercially available laundry detergents are even advertised as being suitable for washing fabrics at 40° C. or 30° C. or even at room temperature. To achieve satisfactory washing result at such low temperatures, i.e. results comparable to those obtained with hot water washes, the demands on low temperature detergents are especially high.
It is known to include certain additives in detergent compositions to enhance the detergent power of conventional surfactants so as to improve the removal of grease stains at temperatures of 60° C. and below.
EP 17180161.6 relates to alkoxylated esteramines and salts thereof. The respective esteramines and salts thereof mandatorily contain fragments based on alkoxy units as well as fragments based on amino acids, such as alanine or glycine. Furthermore, a process for the preparation of such esteramines or salts thereof is disclosed as well as their use in personal care compositions.
U.S. Pat. No. 3,398,163 relates to organic compounds which are useful as non-ionic detergents. The respective organic compounds are ethylene oxide adducts of amino esters. The respective compounds are prepared in a first step by reacting a monocarboxylic acid with a hydroxy-substituted alkyl primary amine in the presence of an acid catalyst. The so obtained intermediate is further reacted in a second step by performing an alkoxylation in order to obtain the organic compounds, which are useful as non-ionic detergents. By consequence, said organic compounds do not contain any primary amine fragments. Furthermore, said organic compounds do not contain any fragments based on organic sulfonic acid anions.
US-A 2010/0298183 relates to an additive for oils that is capable of imprinting oils, such as lubricant base oils with superior wear resistance properties or friction resistance properties, and a lubricant. The specific compounds disclosed therein also comprise esteramines, which may optionally be present as acid addition salts including organic acid salts, such as carboxylates or sulfonates as well as inorganic acid salts, including a hydrochloride or nitrate. However, the specific ester amines disclosed in US-A 2010/0298183 are based on dicarboxylic acids.
J. Geurts et al. (Journal of Applied Polymer Science, Volume 80, 1401-1415 (2001)) relates to the synthesis of new amino-functionalized methacrylates and their use in free radical polymerizations.
DE-A 1 593 962 relates to a process for producing acyloxyalkylamine hydrochlorides from acids and aminoalcohols with gaseous hydrochloric acid. Such compounds are considered as valuable intermediates for the production of further compounds, such as isocyanates by reacting with phosgene. The employed acids are dicarboxylic acids in order to obtain the corresponding hydrochloride salts. Salts based on organic sulfonic acids are not disclosed in DE-A 1 593 962.
Instead of (di)carboxylic acids it is also known to employ esters of carboxylic acids as a starting material in order to obtain esteramines. However, the respective reaction starting with esters of carboxylic acids are usually performed under chemoselective enzymatic synthesis by employing specific enzymes, such as Novozym® 435 (F. Le Joubioux et al.; Journal of Molecular Catalysis B: Enzymatic 95 (2013) 99-110), or by employing fatty acid amide hydrolase (FAAH) as described in Y. Yamano et al. (Bioorganic & Medicinal Chemistry 20 (2012) 3658-3665). Due to the employment of specific enzymes, the respective esteramines are not obtained in form of a salt of an organic sulfonic acid. Furthermore, the respective esteramines are intended to be employed in specific pharmaceutical applications, such as anti-tumor drugs or anti-inflammatory compounds.
There is a continuous need for cleaning compositions that remove grease stains from fabrics and other soiled materials, as grease stains are challenging stains to remove. Conventional cleaning compositions directed to grease removal frequently utilize various amine compounds which tend to show strong negative impacts on whiteness.
As a consequence there is still a continual need for amine compounds which provide grease removal abilities from fabrics and other soiled materials which at the same time do not negatively impact clay cleaning abilities or whiteness. There is a need for compounds having grease cleaning abilities at low temperatures.
The object of the present invention is to provide novel compounds which comply with the above-identified objectives and needs.
The object is achieved by an esteramine salt according to general formula (I)
The esteramine salts according to the present invention may be used in cleaning composition, for example in liquid laundry detergents. They lead to improved cleaning performance of said compositions, for example when used in cold water washing conditions. They surprisingly boost grease cleaning performance of liquid laundry detergents, especially under cold water washing conditions. The esteramine salts according to the present invention show improved compatibility in liquid laundry detergent formulations.
For the purposes of the present invention, definitions such as C1-C30-alkyl, as defined above for, for example, the radical R3 in formula (I), mean that this substituent (radical) is an alkyl radical having from 1 to 30 carbon atoms. The alkyl radical can be either linear or branched or optionally cyclic. Alkyl radicals which have both a cyclic component and a linear component likewise come within this definition. The same applies to other alkyl radicals such as a C4-C30-alkyl radical or a C6-C18-alkyl radical. Examples of alkyl radicals are methyl, ethyl, n-propyl, sec-propyl, n-butyl, sec-butyl, isobutyl, 2-ethylhexyl, tert-butyl (tert-Bu/t-Bu), pentyl, hexyl, heptyl, cyclohexyl, octyl, nonyl, decyl or dodecyl.
For the purposes of the present invention, definitions such as C2-C30-alkenyl, as defined above for, for example, the radical R3 in formula (I), mean that this substituent (radical) is an alkenyl radical having from 2 to 30 carbon atoms. This carbon radical is preferably monounsaturated but can optionally also be doubly unsaturated or multiply unsaturated. As regards linearity, branches and cyclic constituents, what has been said above for C1-C30-alkyl radicals applies analogously. C2-C10-alkenyl is, for the purposes of the present invention, preferably vinyl, 1-allyl, 3-allyl, 2-allyl, cis- or trans-2-butenyl, ω-butenyl.
The term “C3-C12-alkylene” as used herein refers to a saturated, divalent straight chain or branched hydrocarbon chains of 3, 4, 5, 6 or up to 12 carbon groups, examples including propane-1,3-diyl, propane-1,2-diyl, 2-methylpropane-1,2-diyl, 2,2-dimethylpropane-1,3-diyl, butane-1,4-diyl, butane-1,3-diyl (=1-methylpropane-1,3-diyl), butane-1,2-diyl, butane-2,3-diyl, 2-methyl-butan-1,3-diyl, 3-methyl-butan-1,3-diyl (=1,1-dimethylpropane-1,3-diyl), pentane-1,4-diyl, pentane-1,5-diyl, pentane-2,5-diyl, 2-methylpentane-2,5-diyl (=1,1-dimethylbutane-1,3-diyl) and hexane-1,6-diyl.
For the purposes of the present invention, the term “aryl”, as defined above for, for example, the radical R3 in formula (I), means that the substituent (radical) is an aromatic. The aromatic can be a monocyclic, bicyclic or optionally polycyclic aromatic. In the case of polycyclic aromatics, individual rings can optionally be fully or partially saturated. Preferred examples of aryl are phenyl, naphthyl or anthracyl, in particular phenyl.
Within the context of the present invention, those substituents (radicals), such as C1-C30-alkyl, C4-C30-alkyl, C6-C18-alkyl, C4-C30-alkenyl and/or C2-C12-alkylene (as well as any other comparable substituent) may be unsubstituted or at least monosubstituted with any further substituent (known to a skilled person), such as alkoxy, amino, hydroxy, carboxy, etc. However, it is preferred within the context of the present invention that said substituents (unless indicated otherwise, for example, for aryl or phenyl) do not contain any further substituents. By consequence, the respective substituent is unsubstituted, which means that it is either straight-chain (linear) or branched. This is in particular the case for the substituents (radicals) R1, R2 and R4 to R11. It has to be noted that branched substituents themselves, such as sec-propyl or sec-butyl, are considered within the context of the present invention as being unsubstituted.
The invention is specified in more detail as follows:
The invention relates to an esteramine salt according to general formula (I)
For the sake of completeness, it is indicated that within general formula (I) individual fragments, which are based on a repetition unit, such as the fragment (CR8R9)n of the substituent R2, may contain an individual substituent, such as R8 or R9, twice or even more and the definition of such substituents is selected independently from each other. For example, the respective fragment contains for n=3 three carbon atoms and each carbon atom contains one substituent R8 and one substituent R9.
In such a case, the respective substituents R8 and R9 may be selected independently from each other for each carbon atom. By consequence, the first carbon atom may contain a substituent R8, which is for example H, whereas the second and/or third carbon atom may contain a substituent R8, which is for example methyl.
The same principle may apply to any other repetition unit within the compounds according to general formula (I) or within the respective educts to be employed for producing compounds according to formula (I).
Preferably, R1 is C4-C30-alkyl, more preferably C6-C21-alkyl. It is even more preferred that the substituent (radical) R1 is unsubstituted (in respect of all before-mentioned specific definitions). This means that the substituent R1 is preferably straight-chain or branched.
In respect of the definition of the substituent R1, it is also preferred that
It has to be noted that the before-mentioned option i) is exemplified below within working example 6, which is based on C8-C10 fatty acids. It also has to be noted that the above-mentioned option ii) in respect of unsubstituted straight-chain R1 radicals is exemplified below, for example, within working example 1, whereas working example 3 is an example of an unsubstituted branched R1 substituent. It has to be noted that the above-mentioned two options i) and ii) in respect of the definition of the substituent R1 can, of course, be combined, for example, as a mixture of at least two unsubstituted straight-chain R1 substituents, such as a substituent derived from unsubstituted straight-chain C8-C10 fatty acids. The same holds true in case at least one of the before-mentioned at least two R′ radicals is an unsubstituted branched R′ radical, which might also be the case in respect of a substituent derived from C8-C10 fatty acids.
The substituent R2 is preferably C3-C12-alkylene, more preferably C3-C6-alkylene. It is even more preferred that the before-mentioned definitions of the substituent R2 are unsubstituted, even more preferably straight-chain. By consequence, it is even more preferred that R2 is straight-chain C2-C12-alkylene, preferably straight-chain C3-C6-alkylene.
In one embodiment of the present invention, the esteramine salts according to general formula (I) have an R2 fragment, which is defined as —((CR10R11)o—CR4R5—CR6R7—O)m—(CR8R9)n—. The definitions of the substituents R4 to R11, m, n and o are the same as defined above.
Within this embodiment, it is preferred that
Within this embodiment, it is even more preferred that the R2 fragment is defined as follows:
R3 is preferably C2-C30-alkyl or at least monosubstituted aryl and the substituents are independently selected from C1-C30-alkyl under the proviso that R3 is not para toluenyl. R3 is more preferably C6-C18-alkyl or at least monosubstituted phenyl and the substituents are independently selected from C1-C30-alkyl under the proviso that R3 is not para toluenyl.
It is even more preferred that the substituent R3 is defined as follows:
It has to be noted that the two before-mentioned options i) and ii) for the definition of the substituent R3 may be combined as exemplified below, for example, within working example 1.
It is therefore preferred that the substituent R3 is derived from dodecylbenzene sulfonic acid according to general formula (IVa), which is a mixture of isomers, wherein the respective alkyl fragments are in para position to the sulfonic acid group and m and n are independently of each other an integer from 0 to 10 under the proviso that the sum of m and n is an integer from 7 to 10.
In one preferred embodiment of the present invention, the esteramine salt according to general formula (I) is defined as follows:
Within this embodiment, it is even more preferred that
In another embodiment of the present invention, the esteramine salt according to the general formula (I) is defined as follows:
Another subject of the present invention is a process for preparing the esteramine salt as described above. Within this process for preparing an esteramine salt, a monocarboxylic acid or an ester thereof is reacted with an aminoalcohol and a sulfonic acid, and the molar ratio of sulfonic acid versus aminoalcohol is ≥1:1 [mol]/[mol]. The before-mentioned compounds as such (educts) are known to a person skilled in the art.
It has to be noted that the educts to be employed within the inventive process (i) monocarboxylic acid or an ester thereof, ii) aminoalcohol and iii) sulfonic acid) can be added to each other and/or mixed with each other in any amount or any ratio or any sequence/order as known to a person skilled in the art. For example, all educts can be mixed with each other in a first step, prior to initiating the process for preparing the esteramine salt according to the present invention. During this mixing step, the temperature should preferably be kept in a range of 20 to 90° C. After completion of the adding/mixing of all educts, the temperature is usually raised further, preferably to a range of 120 to 150° C. However, it is also possible that some or all of the educts of the inventive process are added step- and/or batchwise.
In case an ester of a monocarboxylic acid is employed within the inventive process, it is also possible that the respective ester is based on a bi- or higher functional alcohol, preferably on the trifunctional alcohol glycerine. By consequence, it is also possible that the respective alcohol fragment of said ester is connected with two or more individual monocarboxylic acid fragments. However, it is preferred that the respective ester, in particular the respective triglyceride is based on glycerine, and the respective monocarboxylic acid fragments are identical for each of the three ester groups contained within said compound.
Within this process, it is preferred that
The process according to the present invention is preferably carried out, comprising the steps a) to d) as follows:
In case the ester employed within step a) as described above is a triglyceride, it is preferred that step d) is not carried out since the released glycerine (formed alcohol from the employed triglyceride) preferably remains within the reaction mixture.
The monocarboxylic acid or an ester thereof to be employed within the inventive process are preferably defined as follows:
An example of a monocarboxylic acid is decanoic acid or 3,3,5-trimethylhexane acid and C8-C10-fatty acid methyl ester is an example for an ester (methylester) of a monocarboxylic acid (C8-C10-fatty acid).
The aminoalcohol to be employed within the inventive process is preferably defined as follows:
HO—R2—NH2 (III)
In one embodiment according to the inventive process, the aminoalcohol according to formula (III) is selected from an aminoalcohol, wherein R2 is C3-C12-alkylene. 3-amino-1-propanol or 5-amino-1-pentanol are examples of such an aminoalcohol.
In another embodiment according to the inventive process, the aminoalcohol according to formula (III) is selected from an aminoalcohol, wherein R2 is —((CR10R11)o—CR4R5—CR6R7—O)m—(CR8R9)n— and R4, R5, R6, R7, R8, R9, R10 and R11 are independently of each other selected from hydrogen or C1-C10-alkyl,
m is an integer from 1 to 100,
n is an integer from 2 to 12, and
o is an integer from 0 to 10.
Such aminoalcohols according to formula (III), wherein R3 is —((CR10R11)o—CR4R5—CR6R7—O)m—(CR8R9)n—, are commercially available and may, for example, be obtained from the reaction of ammonia with C3-C16-alkylene oxide (as described in M. Frauenkron et al., ULLMANN'S Encyclopedia of Industrial Chemistry: “Ethanolamines and Propanolamines” 2001), or by reaction from ethylene glycols with acrylonitrile, followed by hydrogenation (e.g. described in DE2136884). Other routes to aminoalcohols according to formula (III) involve partial amination of polyglycol ethers with ammonia. 2-(2-aminoethoxy)ethanol is an example of an aminoalcohol falling under the definition of R2 according to this embodiment.
The sulfonic acid to be employed within the inventive process is preferably defined as follows:
A preferred example of a sulfonic acid is depicted in general formula (IVa)
which is a mixture of isomers, wherein the respective alkyl fragments are in para position to the sulfonic acid group and m and n are independently of each other an integer from 0 to 10 under the proviso that the sum of m and n is an integer from 7 to 10.
Another example of a sulfonic acid is 2,4-dimethylbenzene sulfonic acid.
For the sake of completeness, it is indicated that further preferred, more preferred etc. definitions for the compounds as such (educts) to be employed within the inventive process are those which are in accordance with the respective preferred, more preferred etc. definitions for the esteramine salt according to general formula (I) as defined above.
It is also possible that the inventive process is carried out by additionally employing a solvent. Any solvent known to a skilled person may be employed, for example, water, xylene, toluene etc.
However, it is preferred that no additional solvent is employed within the inventive process.
The inventive process can be carried out within any apparatus known to a skilled person. The inventive process may also be carried out under an inert gas atmosphere, such as nitrogen or argon. Further aspects for carrying out the inventive process are exemplified below within the experimental part.
The effects for laundry as described and exemplified herein may be extrapolated to personal care applications.
The esteramine salts according to the present invention can be used and may be included in applications in personal care, as curing agent for epoxy resins, as reactant in the production of polymers, in polyurethanes, polyureas, and as thermoplastic polyamide adhesives. They can also be used in shampoo and body wash formulations. The esteramine salts may be included in personal care composition. By consequence, the before-mentioned use of the inventive esteramine salts as well as personal care compositions containing the inventive esteramine salts are further subjects of the present invention.
The following examples shall further illustrate the present invention without restricting the scope of this invention.
In a 4-neck vessel with thermometer, reflux condenser, nitrogen inlet, dropping funnel, and stirrer, 11.3 g 3-amino-1-propanol and 25.8 g decanoic acid are placed at room temperature to 42° C. To the mixture 51.5 g dodecylbenzene sulfonic acid (mixture of isomers wherein each isomer is based on a monosubstituted benzene sulfonic acid with the substituent in para position as shown in FIG. 4a) is added within 30 minutes. The temperature is allowed to rise to 80° C. during the addition. The reaction mixture is heated to 130° C. and is stirred for 4 hours at 130° C. Vacuum is applied (5 mbar) and the mixture is stirred for 16 hours at 130° C. 83.0 g of a brown viscous oil is obtained. 1H-NMR in MeOD indicates 89% conversion to decanoic acid, ester with 3-amino-1-propanol as dodecylbenzene sulfonic acid salt.
In a 4-neck vessel with thermometer, reflux condenser, nitrogen inlet, and stirrer, 18.77 g 3-amino-1-propanol and 43.07 g decanoic acid are placed at room temperature and heated to 55° C. To the mixture 46.66 g m-xylene sulfonic acid (2,4-dimethylbenzene sulfonic acid) is added in portions within 30 minutes. The temperature is allowed to rise to 70° C. during the addition. The reaction mixture is heated to 130° C. and is stirred for 4 hours at 130° C. Vacuum is applied (5 mbar) and the mixture is stirred for 30 hours at 130° C. 98.0 g of a brown wax is obtained. 1H-NMR in MeOD indicates 81% conversion to decanoic acid, ester with 3-amino-1-propanol as xylene sulfonic acid salt.
In a 4-neck vessel with thermometer, distillation equipment, nitrogen inlet, dropping funnel, and stirrer, 15.02 g 3-amino-1-propanol and 31.65 g 3,5,5-trimethylhexane acid are placed at room temperature to 72° C. To the mixture 66.61 g dodecylbenzene sulfonic acid (mixture of isomers as described in example 1) is added within 1 hour. The temperature is allowed to rise to 65° C. during the addition. The reaction mixture is heated to 130° C. and is stirred for 4 hours at 130° C. The formed water is destilled off. Vacuum is applied (5 mbar) and the mixture is stirred for 22 hours at 138° C. 105.0 g of a brown viscous oil is obtained. 1H-NMR in MeOD indicates 98% conversion to 3,5,5-trimethylhexane acid, ester with 3-amino-1-propanol as dodecylbenzene sulfonic acid salt.
In a 4-neck vessel with thermometer, reflux condenser, nitrogen inlet, dropping funnel, and stirrer, 26.3 g 2-(2-aminoethoxy)ethanol and 43.1 g decanoic acid are placed at room temperature. To the mixture 83.3 g dodecylbenzene sulfonic acid (mixture of isomers as described in example 1) is added within 15 minutes. The temperature is allowed to rise to 60° C. during the addition. The reaction mixture is heated to 130° C. and is stirred for 4 hours at 130° C. Vacuum is applied (5 mbar) and the mixture is stirred for 22 hours at 130° C. 140.0 g of a brown viscous oil is obtained. 1H-NMR in MeOD indicates 95% conversion to decanoic acid, ester with 2-(2-aminoethoxy)ethanol as dodecylbenzene sulfonic acid salt.
In a 4-neck vessel with thermometer, reflux condenser, nitrogen inlet, dropping funnel, and stirrer, 26.3 g 2-(2-aminoethoxy)ethanol and 36.6 g 3,5,5-trimethylhexane acid are placed at room temperature. To the mixture 83.3 g dodecylbenzene sulfonic acid (mixture of isomers as described in example 1) is added within 15 minutes. The temperature is allowed to rise to 60° C. during the addition. The reaction mixture is heated to 130° C. and is stirred for 4 hours at 130° C. Vacuum is applied (350 mbar) and the mixture is stirred for 22 hours at 130° C. 142.0 g of a brown viscous oil is obtained. 1H-NMR in MeOD indicates 90% conversion to 3,5,5-trimethylhexane acid, ester with 2-(2-aminoethoxy)ethanol as dodecylbenzene sulfonic acid salt.
In a 4-neck vessel with thermometer, distillation equipment, nitrogen inlet, dropping funnel, and stirrer, 3.8 g 3-amino-1-propanol and 26.6 g C8-10 fatty acid methyl ester (Aqnique ME610G) are placed at room temperature to 135° C. To the mixture 16.7 g dodecylbenzene sulfonic acid (mixture of isomers as described in example 1) is added within 30 minutes. The reaction mixture is stirred for 6 hours at 135° C., while the formed methanol is distilled off. Vacuum is applied (200 mbar) and the mixture is stirred for additional 5 hours at 135° C. and 200 mbar. Vacuum is lowered to 5 mbar and excess C8-10 fatty acid methyl ester is removed by stirring for 1.5 hours at 130° C. and 5 mbar. 27.0 g of a brown viscous oil is obtained. 1H-NMR in MeOD indicates 94% conversion to C8-10 fatty acids, ester with 3-amino-1-propanol as dodecylbenzene sulfonic acid salt.
In a 4-neck vessel with thermometer, distillation equipment, nitrogen inlet, dropping funnel, and stirrer, 5.4 g 5-amino-1-pentanol and 26.6 g C8-10 fatty acid methyl ester (Aqnique ME610G) are placed at room temperature and are heated to 100° C. To the mixture 16.7 g dodecylbenzene sulfonic acid (mixture of isomers as described in example 1) is added within 10 minutes. The reaction mixture is stirred for 6 hours at 135° C., while the formed methanol is distilled off. Vacuum is applied (200 mbar) and the mixture is stirred for additional 6 hours at 135° C. and 200 mbar. Vacuum is lowered to 5 mbar and excess C8-10 fatty acid methyl ester is removed by stirring for 2 hours at 130° C. and 9 mbar. 28.0 g of a brown viscous oil is obtained. 1H-NMR in MeOD indicates 83% conversion to C8-10 fatty acids, ester with 5-amino-1-pentanol as dodecylbenzene sulfonic acid salt.
In a 4-neck vessel with thermometer, distillation equipment, nitrogen inlet, dropping funnel, and stirrer, 11.3 g 3-amino-1-propanol and 23.5 g glyceryltrioctanoate are placed at room temperature. To the mixture 50.0 g dodecylbenzene sulfonic acid (mixture of isomers as described in example 1) is added within 10 minutes. The reaction mixture is stirred for 12 hours at 135° C. 80.0 g of a brown viscous oil is obtained. 1H-NMR in MeOD indicates 63% conversion to octanoic acid, ester with 3-amino-1-propanol as dodecylbenzene sulfonic acid salt.
In a 4-neck vessel with thermometer, distillation equipment, nitrogen inlet, dropping funnel, and stirrer, 22.5 g 3-amino-1-propanol are placed at room temperature. 47.5 g 3,5,5-trimethylhexane acid is added within 25 min. To the mixture 29.4 g methane sulfonic acid is added within 20 minutes. The temperature is allowed to rise to 60° C. during the addition. The reaction mixture is heated to 130° C. and is stirred for 4 hours at 130° C. The formed water is distilled off. Vacuum is applied (5 mbar) and the mixture is stirred for 22 hours at 135° C. 89.0 g of a brown solid is obtained. 1H-NMR in MeOD indicates 91% conversion to 3,5,5-trimethylhexane acid, ester with 3-amino-1-propanol as methane sulfonic acid salt.
Technical stain swatches of blue knitted cotton containing Bacon Grease were purchased from Warwick Equest Ltd. The stains were washed for 30 min in a launder-o-meter (manufactured by SDL Atlas) at room temperature using per canister 500 mL of washing solution, 20 metal balls and ballast fabrics. The washing solution contained 5000 ppm (2.5 g in 500 mL canister) of detergent composition DC1 (table 1). Water hardness was 2.5 mM (Ca2+:Mg2+ was 4:1). 75 ppm of additives (as shown in table 2) were added to the washing solution of each canister separately and in the amount as detailed below. In the additive content is considered content of pure active in the salt.
Amount of additive is defined as follows:
After addition the pH value was re-adjusted to the pH value of washing solution without additive.
Standard colorimetric measurement was used to obtain L*, a* and b* values for each stain before and after the washing. From L*, a* and b* values the stain level were calculated as color difference ΔE (calculated according to DIN EN ISO 11664-4) between stain and untreated fabric.
Stain removal from the swatches was calculated as follows:
Stain level corresponds to the amount of grease on the fabric. The stain level of the fabric before the washing (ΔEinitial) is high, in the washing process stains are removed and the stain level after washing is smaller (ΔEwashed). The better the stains have been removed the lower the value for ΔEwashed will be and the higher the difference will be to ΔEinitial. Therefore, the value of stain removal index increases with better washing performance as shown in table 2 below.
As can be seen from table 2, especially form the comparison of experiments #3 and 4, strains can be removed more efficiently by employing a detergent composition DC1 containing a compound according to the present invention (example 3) compared to a composition containing comparative example 1 instead.
| Number | Date | Country | Kind |
|---|---|---|---|
| 18180689.4 | Jun 2018 | EP | regional |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2019/066537 | 6/21/2019 | WO | 00 |
