Patent Application
20130310299
The invention concerns aqueous compositions containing 45-65 wt % of secondary paraffinsulfonate, 1-10 wt % of tetrahydroxypropylethylenediamine and water.
Secondary paraffinsulfonates are well known for use as base surfactants, specifically for laundry-detergent applications, ware-cleaning products and industrial cleaners.
Secondary paraffinsulfonates are surfactants containing a random distribution of primarily one SO3X group in secondary position on the paraffin hydrocarbon chain and secondarily two or more SO3X groups in secondary position on the paraffin hydrocarbon chain. The paraffin hydrocarbon chains are primarily linear ones, being branched paraffin chains of 8 to 22 carbon atoms only to a low extent of 5 wt % or less. The X group can represent Li+, Na+, K+, Mg++, Ca++, Al+++, NH4+ and quaternary ammonium ions [HNR1R2R3]+, where R1, R2 and R3 may each be independently selected from the group consisting of hydrogen, a linear or branched alkyl group having 1 to 22 carbon atoms, a linear or branched mono- or polyunsaturated alkenyl group having 2 to 22 carbon atoms, a linear monohydroxyalkyl group having 2 to 10 carbon atoms, preferably a monohydroxyethyl or monohydroxypropyl group, and a linear or branched dihydroxyalkyl group having 3 to 10 carbon atoms.
This class of surfactants is obtainable by sulfoxidation of paraffins under photochemical conditions and is commercially available, for example under the trade name Hostapur® SAS in the concentrations 30 wt %, 60 wt % and 93 wt %.
Approximately 60 wt % strength aqueous secondary paraffinsulfonate is pasty and tends to phase-separate. To prevent phase separation, it has to be permanently stirred or recirculated. Additives are therefore sought to suppress phase separation and thereby obviate the energy-intensive stirring or pumping operation for avoiding phase separation.
It is known that the addition of 5 to 10 wt % of ethanol or i-propanol to approximately 60 wt % strength aqueous secondary paraffinsulfonate eliminates phase separation. Disadvantageously, however, the preparation is flammable and appropriate safety precautions have to be taken.
The problem addressed by the present invention was therefore that of providing compositions having a high proportion of secondary paraffinsulfonate which do not exhibit phase separation even in the course of prolonged storage and in the event of major temperature fluctuations and do not contain flammable components.
We have found that, surprisingly, this problem is solved by compositions containing
and
The present invention accordingly provides compositions containing
and
Not only the secondary paraffinsulfonates of component a) but also the compound of the formula (I) [tetrahydroxypropylethylenediamine] are obtainable by methods familiar to a person skilled in the art or commercially available.
The compositions of the present invention are very phase-stable. They remain phase-stable over a period of 6 or more months, preferably in a temperature range of 5 to 40° C. They are ecologically compatible, substantially odor-neutral, preferably have a homogeneous appearance and are in addition preferably from transparent to colorless and preferably colorless.
The viscosity of compositions according to the present invention at 20° C. is preferably in the range from 1000 to 100000 mPa·s, more preferably in the range from 2000 to 70000 mPa·s and even more preferably in the range from 5000 to 60000 mPa·s. The viscosities are measured on the compositions of the present invention themselves under the following conditions: Brookfield RVT instrument; spindle No. 3 for the viscosity range from 1000 to 5000 mPa·s, spindle No. 4 for the viscosity range from >5000 to 10000 mPa·s and spindle No. 7 for the viscosity range from >10000 to 100000 mPa·s; 20 revolutions per minute and 20° C.
The compositions of the present invention are advantageously pumpable.
Preferably, the compositions of the present invention contain
More preferably, the compositions of the present invention contain
Preferably, the compositions of the present invention contain in addition to components a) to c)
Among these compositions, preference is in turn given to those which contain
In a preferred embodiment of the invention, the compositions of the present invention consist of said components a) to e).
Preferably not less than 95 wt % and more preferably not less than 97 wt % of the one or more secondary paraffinsulfonates of component a) contain from 14 to 17 carbon atoms.
Preferably, from 95 to 100 wt % and more preferably from 96 to 99.9 wt % of the one or more secondary paraffinsulfonates of component a) contain a linear paraffin moiety and from 0 to 5 wt %, more preferably 0.1 to 4 wt %, of the one or more secondary paraffinsulfonates of component a) contain a branched paraffin moiety.
Preferably, the counter-ions of the one or more secondary paraffinsulfonates of component a) are selected from the group consisting of Na+, K+, Mg2+ and Ca2+. More preferably, the counter-ion of the one or more secondary paraffinsulfonates of component a) is Na+.
Preferably, from 99.5 to 100 wt % of the one or more secondary paraffinsulfonates of component a) contain a saturated paraffin moiety and from 0 to 0.5 wt % of the one or more secondary paraffinsulfonates of component a) contain an unsaturated paraffin moiety. More preferably, 100 wt % of the one or more secondary paraffinsulfonates of component a) contain a saturated paraffin moiety and no unsaturated fractions.
In the context of the present invention “secondary paraffinsulfonate” is to be understood as meaning that the sulfonate groups are attached to the nonterminal paraffin moiety.
Preferably, the sulfonate groups are randomly distributed across the nonterminal paraffin moiety of the one or more secondary paraffinsulfonates of component a) and from 75 to 95 wt % of the one or more secondary paraffinsulfonates bear one sulfonate group and from 5 to 25 wt % of the one or more secondary paraffinsulfonates bear two or more sulfonate groups.
The pH of compositions according to the present invention is preferably in the range from 6.0 to 9.0 and more preferably in the range from 7.0 to 8.5.
The compositions of the present invention are obtainable by said components a) to c) and optionally d) and e) (and optionally further components) being mixed together at room temperature or at elevated temperatures, preferably at temperatures to 80° C., under agitation. Preferably, component a) is initially charged in water, which is component c), optionally together with components d) and e) and component b) is added under agitation. This may preferably take the form of the tetrahydroxypropylethylenediamine being added directly following the synthesis and workup of the secondary paraffinsulfonate, which is typically synthesized in water.
The compositions of the present invention are very useful in the manufacture of washing and cleaning products. The present invention accordingly further provides for the use of a composition according to the present invention in the manufacture of washing and cleaning products.
The washing and cleaning products obtainable from the compositions of the present invention are preferably dishwashing detergents, preferably manual dishwashing detergents, liquid laundry detergents, hard surface cleaners, for example for cleaning ceramic, metal or glass surfaces, neutral cleaners, all-purpose cleaners, sanitary cleaners, floor cleaners, industrial cleaners, but also washing and cleaning products in pulverulent form.
The amounts in which the compositions of the present invention are present in the washing and cleaning products obtained therefrom are preferably in the range from 0.5 to 60.0 wt % and more preferably in the range from 2.0 to 50.0 wt %. These quantitative particulars are based on the overall weight of the final washing and cleaning product.
The compositions of the present invention can be used not only in acidic but also in basic formulations, preferably in formulations having a pH of 2 to 13. The compositions of the present invention have the advantage that they are stable at these pH values.
The compositions of the present invention are further very useful in the manufacture of cosmetic cleaning products such as, for example, shampoos, shower gels, foam baths, soaps and dentifrices.
The compositions of the present invention are further very useful as antistatics for plastics, as auxiliaries for emulsion polymerizations, as textile and leather auxiliaries, for use in fire extinguishants and for use as oil field chemicals.
The examples which follow are offered by way of elucidation, not limitation of the invention. All percentages are weight percent (wt %), unless explicitly stated otherwise.
Inventive compositions of Examples 1 to 5 and also of Comparative Example V-6 were prepared and visually evaluated with regard to their appearance, phase stability and consistency. The results are reported in table A.
Method of making:
Hostapur® SAS 60 is initially charged and tetrahydroxypropylethylenediamine is added at room temperature under agitation which is subsequently continued for 5 minutes.
Hostapur® SAS 60 is a composition of secondary sodium paraffinsulfonate (about 60 wt %) in water. The secondary paraffinsulfonate used contains about 97 wt % of paraffinsulfonates having 14 to 17 carbon atoms. The n-paraffin fraction of the secondary paraffinsulfonate is >98 wt %. The secondary paraffinsulfonate is 100% saturated. It comprises about 90 wt % of monosulfonated and about 10 wt % of disulfonated and more highly sulfonated paraffinsulfonates.
Compositions 1-5 and V-6 were evaluated for phase stability by storing the compositions for 6 months while alternating between 12 hours at a temperature of 40° C. and 12 hours at a temperature of 5° C. A reported phase separation, however, does not mean that this phase separation only occurred after 6 months.
The results in Table A reveal that Inventive Examples 1 to 5 are phase-stable compositions. By contrast, the composition of Comparative Example V-6, which contains a small amount of tetrahydroxypropylethylenediamine, gave rise to phase separation.
Adding tetrahydroxypropylethylenediamine has the effect of reducing the viscosity of Hostapur® SAS 60 in the compositions of Inventive Examples 1-5. These compositions have such viscosities that they are readily pumpable using commercially available pumps. Addition of tetrahydroxypropylethylenediamine in amounts greater than 10 wt % causes the viscosities of the compositions to increase significantly, rendering the compositions more viscid. A comparative composition prepared from 89.0 wt % of Hostapur® SAS 60 and 11.0 wt % of tetrahydroxypropylethylenediamine is an example of a composition where this was found. Compositions of this type are significantly more difficult to pump than the compositions of the present invention.
Formulations follow which were prepared using compositions of the present invention.
Formulation 1: Dishwashing Composition
Method of Making:
Successive addition to A of components B to F at room temperature under agitation.
Formulation 2: All-Purpose Cleaner
Method of Making:
Formulation 3: Neutral Soap
Method of Making:
Formulation 4: Liquid Laundry Detergent
Method of Making:
The constituents of the formulations in the formulation examples were used in the amounts as reported, so for example the quantitative particulars relate to the employed commercial products as such and not to the active ingredients therein.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2010 055 741.2 | Dec 2010 | DE | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2011/006331 | 12/15/2011 | WO | 00 | 7/23/2013 |
