NZ617459B2 - Deicing composition comprising a deicing agent, a native protein and a thickener - Google Patents

Abstract

The disclosure relates to a deicing composition comprising (i) a deicing agent selected from the group consisting of sodium chloride, calcium magnesium acetate, calcium chloride, magnesium chloride, potassium chloride, potassium acetate, sodium acetate, sodium formate, potassium formate, (ii) a native protein selected from the group consisting of soy based proteins, dairy based proteins, egg proteins and combinations thereof, and (iii) a thickener selected from the group consisting of carboxymethyl cellulose, salts of carboxyl methyl cellulose, guar gum, nanocellulose, ethyl hydroxyethyl cellulose, methylethyl hydroxyethyl cellulose, propoxycellulose, methoxycellulose, ethoxycellulose, hydroxyethylcellulose, lignin derivatives, polyacrylates, polymaleinates, and copolymers of polyacrylates and polymaleinates. It furthermore relates to a process for preparing said deicing composition and to a process for deicing a surface such as asphalt, bituminous, and concrete road surfaces using said deicing composition. ve protein selected from the group consisting of soy based proteins, dairy based proteins, egg proteins and combinations thereof, and (iii) a thickener selected from the group consisting of carboxymethyl cellulose, salts of carboxyl methyl cellulose, guar gum, nanocellulose, ethyl hydroxyethyl cellulose, methylethyl hydroxyethyl cellulose, propoxycellulose, methoxycellulose, ethoxycellulose, hydroxyethylcellulose, lignin derivatives, polyacrylates, polymaleinates, and copolymers of polyacrylates and polymaleinates. It furthermore relates to a process for preparing said deicing composition and to a process for deicing a surface such as asphalt, bituminous, and concrete road surfaces using said deicing composition.

Description

DEICING COMPOSITION COMPRISING A DEICING AGENT, A NATIVE PROTEIN AND A THICKENER The present invention relates to a deicing ition and to a process for the preparation of said deicing composition. It furthermore relates to a process for deicing a surface and to a kit of parts for use in said process.

Finally, it relates to the use of a combination of a native protein and a thickener for improving the efficiency of a deicing ition.

Wintry conditions provide eniences to roads and traffic in the form of snow or black ice. Obviously, eliminating snow, frost, and ice of roads and highways has enormous ts for the safety. Sodium chloride (NaCl) is commonly used to control snow and ice ion on roadways, highways, and sidewalks. The sodium chloride works as a deicing agent by dissolving into precipitation on roadways and lowering the freezing point, thereby melting ice and snow. Other salts that can be used as deicers include for example calcium chloride and magnesium chloride. These compounds depress the freezing point of water to an even lower temperature than sodium chloride.

Also potassium chloride is mes used as a deicer. r, commonly known alternative to road salt is calcium magnesium acetate. Other, less known deicer salts include potassium acetate, sodium acetate, sodium e, and potassium formate.

The wintry conditions also create damage to asphalt, nous, and concrete es. These surfaces have porous structures. Especially asphalt comprises a number of subsurface channels. When the air/ground temperature s iently low, an aqueous solution which is present in the channels of the asphalt will expand upon freezing, thus, creating mechanical stress in the asphalt. Especially after repeated freezing and thawing, the asphalt will break, resulting in potholes. Not only large sums of money have to be spent each year to repair damaged roadways and highways, potholes may also result in dangerous situations for traffic.

Furthermore, the additional maintenance required will result in additional traffic jams.

The problem of damage to roadways and ys because of the expansion and contraction of water or water-based solutions during freezing and thawing cycles has become an even bigger issue since the introduction of a new type of t, the so-called highly porous asphalt in the nineties. This highly porous asphalt concrete may comprise up to 20% of hollow space. This has the advantage that rain and melt water will flow away quickly from the asphalt surface through the subsurface channels into the soil. The asphalt road surface itself retains practically no moisture, and hence, is not slick and slippery even in case of heavy rainfall. While the use of this type of asphalt has an enormous beneficial effect on safety under rainy conditions, a antage is that under wintry conditions more of the deicing agent is needed in order to keep the roads free of snow and ice during the winter as the deicing agent will also flow away with the melt water from the road surface.

It is an object of the present invention to provide a deicing composition which has improved deicing properties. More ularly, it is an object of the present invention to provide a deicing composition which remains effective over a longer period of time so that the deicing agent can be applied less frequently and the damage to especially highly porous road es will be reduced even after repeated freezing and thawing. The foregoing objects should be read ctively with the object of at least ing the public with a useful choice.

Surprisingly, the objective has been met by adding a combination of two types of additives, viz. a protein and a thickener, to a g agent. In more detail, the present invention relates to a deicing composition comprising (i) a deicing agent selected from the group consisting of sodium chloride, calcium magnesium acetate, calcium chloride, magnesium chloride, potassium chloride, potassium acetate, sodium acetate, sodium e, and potassium W0 2012/168205 formate, (ii) native protein, and (iii) a thickener (with the proviso that components (ii) and (iii) are not the same). it was found that the deicing composition according to the present invention has an improved performance. It has been found that by using the specific combination of thickener and native protein, the deicing agent will remain active over a longer period of time. Furthermore, due to better adhesion properties of the deicing composition ed to use of the deicing agent alone, less deicing agent will be blown away and deicing agent is retained on 1O the road for a longer period of time.

In addition, it was found that the use of the g composition according to the t invention s damage to road surfaces after repeated freezing and thawing.

The deicing composition according to the present invention has been found to be less corrosive than conventional deicing compositions.

The deicing agent present in the deicing composition according to the t invention is selected from the group consisting of sodium chloride, calcium magnesium acetate, calcium chloride, magnesium chloride, potassium de, potassium e, sodium acetate, sodium formate, and potassium formate. Preferably, however, the deicing agent is a chloride salt, i.e. it is preferably selected from the group ting of sodium chloride, calcium de, magnesium chloride, and potassium chloride. More preferably calcium chloride is used as the deicing agent in the compositions according to the present invention. Most preferably, sodium chloride is used as the deicing agent in the compositions according to the present invention as it is cheap and available in large quantities.

If the deicing ition is an aqueous composition, the deicing agent is preferably t in an amount of at least 5% by weight, more preferably at least 10% by weight and most preferably at least 20% by weight (based on W0 2012/168205 the total weight of the deicing composition). Preferably, such aqueous g ition comprises at most the saturation concentration of the deicing agent. The deicing composition according to the present invention can also be in the form of a slurry, containing g agent at concentrations higher than the saturation concentration. If the deicing composition is in the form of a solid, it may comprise as little as 5% by weight of deicing agent (based on the total weight of the deicing composition), if it is, for example, mixed with gritting material like sand. However, preferably, the deicing composition ing to the t invention comprises at least 50% by weight of the deicing agent, yet more preferably at least 70% by weight, and most preferably at least 96% by weight of the deicing agent (based on the total weight of the deicing composition).

The protein according to the present invention is a protein which is in its native form. In other words, it is a non-denatured protein. As the skilled person knows, proteins (or rather polypeptides in general) can lose their secondary and ry structure if exposed to chemical, physical stress or mechanical stress, such as a strong acid or base, urea, an organic solvent or heat. Proteins that are denatured under such harmful circumstances are no longer suitable for use in the deicing composition according to the present invention as they have lost their iveness. Accordingly, with the terms “native protein” and “protein in its natural state” it is meant that the protein has not been altered under denaturing conditions such as heat, chemicals, enzyme action or the exigencies of extraction.

For the sake of y it is noted that the protein according to the present invention is not a protein as present in es.

The protein suitable for use in the composition according to the present ion is preferably a protein selected from the group consisting of soy based proteins, dairy based proteins, egg proteins and combinations thereof.

W0 2012/168205 In one embodiment, for example, the protein is spray dried egg white powder, yolk from eggs, or mixtures thereof.

The protein is typically present in the deicing composition according to the present invention in an amount at least 10 ppm, more preferably at least 100 ppm and most ably at least 500 ppm. It is preferably present in an amount of less than 10.000 ppm, more preferably in an amount of less than 8.000 ppm and most preferably, in an amount of less than 5.000 ppm.

The protein concentrations are expressed in ppm, herewith defined as mg protein per kg of the total deicing ition.

The thickener suitable for use in the composition according to the t invention is preferably a thickener selected from the group consisting of lignin derivatives, thickeners with a celluloslc/starch based backbone, thickeners with a gallactomannan based backbone (like guar gum), thickeners bearing sulphonate or nic acid functionality or salts thereof, thickeners bearing carboxylic acid functionality or salts thereof, and combinations thereof. The thickener is more preferably selected from the group consisting of carboxymethyl cellulose, salts of carboxylmethyl cellulose, guar gum, nanocellulose, ethyl hydroxyethyl cellulose, ethyl yethyl cellulose, propoxycellulose, methoxycellulose, ethoxycellulose, hydroxyethylcellulose, lignin derivatives, polyacrylates, leinates, and copolymers of polyacrylates and polymaleinates. It is also possible to use a mixture of two or more of these thickeners.

It is noted that, although less red, the thickener can be a protein having thickener properties, eg. gelatin. It is noted, however, that components (ii) and (iii) in the composition according to the present invention cannot be identical. In other words, if component (iii) is a protein having thickener ties, ent (ii) is a native n according to the present invention which is different from component (iii), A synergistic effect of W0 2012/168205 components (ii) and (iii) is merely observed in case said components differ from one another.

In a preferred embodiment, the thickener is a lignin derivative. The biopolymer lignin is an amorphous r related to cellulose that provides rigidity and together with cellulose forms the woody cell walls of plants and the cementing al between them. It generally has a molecular weight of at least 10.000 Da. Lignin is most commonly found in wood, but can also be found in plants and algae. It consists of the monolignols umaryl alcohol, coniferyl l and sinapyl alcohol. These monomers are incorporated in varying amounts.

Lignin can be rendered water—soluble by exposing it to acidic or alkali conditions or bleached ed with e.g. H202 or hypochlorite), thus increasing the number of aliphatic and aromatic hydroxyl and carboxylic acid functionalities or hydrolyzing it to lower molecular fragments. Under neutral conditions, lignin can be hydrophilized by sulfite pulping while introducing sulphonate or sulphonic acid functionality.

The term n derivative” as used throughout the specification, is meant to denote all compounds derived from lignin using at least one of the just- 2O described procedures and which have a solubility of at least 10 g per litre in water at 25°C. Other chemical functionalities may be present as long as they do not compromise the overall water-solubility. Preferably, the lignin tive according to the present invention has an average molecular weight of at least 5 kDa, more ably at least 10 kDa. Most preferably, the lignin derivative carries carboxylic acid functionality, while most preferably, it carries sulphonate or nic acid groups (i.e. it is a lignosulphonate).

A lignosulphonate, according to the present invention, is a nated lignin derived from the biopolymer lignin. During the pulping process of wood in presence of sulphite, the lignosulphonate is produced as a by-product. The product can be (chemically) purified and spray dried, though neither of these W0 2012/168205 2012/060542 steps is required for a good cy in accordance to the present invention.

Lignosulphonates have very broad ranges of molecular mass (they are very polydisperse). For example a range of from 1000—140,000 Da has been reported for softwood. ulfonates with lower values have reported for hardwoods.

The lignin derivative suitable for use in the composition according to the present invention is preferably a lignin derivative d from wood, plants or algae. It is also le to use a mixture of lignin derivatives originating from different sources. Most preferable is the use of a lignin derivative derived from wood. All types of lignin derivatives can be used in the composition according to the present invention, i.e. the Na, K, Ca, Mg, or NH4 salts.

In a preferred embodiment, the thickener is carboxymethyl cellulose having a degree of substitution (i.e. the average number of carboxymethyl ether groups per repeating anhydroglucose chain unit of the cellulose molecule) of between 0.4 and 1.0, and an e degree of polymerization of between 3000 and 8000.

It is noted that a skilled person will understand that the term e of rization” refers to the average degree of polymerization, which means the e number of glucose units in the cellulose polymer chain.

The degree of polymerization is determined by the formula DP = Mn/Mo, wherein Mn is the number average molecular weight and M0 is the molecular weight of a monomeric unit.

A series of commercially available binders containing sodium carboxymethyl cellulose especially useful in the present invention is available from AkzoNobel, under the trademark AkucellTM.

The carboxymethyl cellulose to be used in accordance with the present invention can be obtained by the processes described by DJ. Sikkema and W0 2012/168205 H. Janssen in Macromolecules, 1989, 22, 364-366, or by the process disclosed in WC 99/206357. The procedures and apparatus to be used are conventional in the art and variations on these known procedures can easily be made by a person skilled in the art using routine experimentation.

Various sources of cellulose can be used, including bagasse.

The carboxymethyl cellulose to be used in accordance with the t invention typically is used as a dry powder, but it can also be supplied as a suspension or as an aqueous solution. rmore, the carboxymethyl cellulose ing to the invention can be a ed grade or a technical grade (containing the by-products NaCl and sodium glycolates).

The thickener is typically present in the deicing composition according to the present invention in an amount of at least 10 ppm, more preferably at least 100 ppm and most preferably at least 500 ppm. in case of an s deicing composition, the thickener can be t in an amount up to its saturation concentration. The thickener is preferably present in the deicing composition according to the invention in an amount of less than 10.000 ppm, more preferably in an amount of less than 8.000 ppm and most preferably, in an amount of less than 5.000 ppm.

The thickener concentrations are expressed in ppm, th defined as mg thickener per kg of the total g composition.

The present invention furthermore relates to a process for preparing the deicing ition according to the present invention. Said process of spraying an aqueous treatment on sing a native protein and a thickener, onto a deicing agent selected from the group consisting of sodium chloride, m magnesium acetate, calcium chloride, magnesium chloride, potassium chloride, potassium acetate, sodium acetate, sodium formate, and potassium formate. Preferably, the aqueous treatment solution is sprayed 3O onto the deicing agent in an amount so that the resulting deicing composition will comprise at least 10 ppm, more preferably at least 100 ppm and most preferably at least 500 ppm of the protein and at least 10 ppm, more ably at least 100 ppm and most preferably at least 500 ppm of the ner. Preferably, the resulting g composition comprises no more than 10.000 ppm, more preferably no more than 8.000 ppm and most preferably, no more than 5.000 ppm of the protein. Preferably, the resulting deicing composition comprises no more than 10.000 ppm, more preferably no more than 8.000 ppm and most preferably, no more than 5.000 ppm of the thickener.

As described above, the protein is ably selected from the group consisting of soy based proteins, dairy based proteins, egg proteins and combinations thereof. The thickener is preferably selected from the group consisting of thickeners with a osic/starch based backbone, thickeners with a guar based backbone, thickeners bearing sulphonate or sulphonic acid functionality or salts thereof, thickeners bearing carboxylic acid functionality or salts thereof, and combinations thereof. More preferably, the thickener is selected from the group consisting of ymethyl cellulose, salts of carboxylmethyl cellulose carboxylmethyl cellulose, guar gum, nanocellulose, ethyl hydroxyethyl cellulose, methylethyl hydroxyethyl cellulose, propoxycellulose, methoxycellulose, ethoxycellulose, hydroxyethylcellulose, Iignin derivatives, polyacrylates, polymaleinates, and copolymers of polyacrylates and polymaleinates.

As described above, the protein and the thickener are not equal. If the thickener is a native protein having thickener properties, a ent type of native protein is added to the deicing agent.

The present invention furthermore relates to a process for deicing a surface.

Said surface can be deiced in s ways.

In one ment the deicing ition according to the present invention is spread onto said surface.

W0 2012/168205 In another embodiment, the process for deicing a surface comprises the steps of mixing a solid deicing agent selected from the group consisting of sodium chloride, calcium magnesium acetate, calcium chloride, magnesium chloride, ium chloride, potassium acetate, sodium acetate, sodium formate, and potassium formate with an aqueous treatment solution comprising a native n and a thickener, and spreading the thus obtained mixture onto said surface. This method ing to the present invention is a preferred embodiment since the risk that the deicing composition is blown away is greatly reduced. Furthermore, a better adhesion of the deicing composition to the road surface is attained.

In yet another embodiment, the process for deicing a surface comprises the steps of preparing an aqueous solution comprising between 5% by weight and the saturation concentration of a solid g agent selected from the group consisting of sodium chloride, calcium magnesium e, calcium chloride, magnesium chloride, potassium chloride, potassium acetate, sodium acetate, sodium formate, and potassium formate; a native protein and a thickener and ng said mixture onto said surface, eg. by ng. This method ing to the present invention is also a preferred embodiment since the risk that the deicing composition is blown away is also in this method greatly reduced. Furthermore, a better adhesion of the deicing composition to the road surface is attained.

In yet another embodiment of the present ion, the process for deicing a surface comprises the steps of spreading a deicing agent selected from the group consisting of sodium chloride, calcium magnesium acetate, calcium chloride, magnesium chloride, ium chloride, potassium acetate, sodium acetate, sodium formate, and ium e in solid or aqueous form onto said surface and separately ing a native protein and a thickener in solid or aqueous form onto said surface.

The surface to be deiced is preferably a surface ed from the group ting of non-porous asphalt road, asphalt road, porous asphalt road, W0 2012/168205 concrete road, bituminous road, brick road, graveled path, cobbled road, unpaved road, and pavement.

Preferably at least 1 g of deicing agent, at least 0.01 mg of protein and at least 0.01 mg of ner is uced per m2 of said surface. Preferably, no more than 50 g of deicing agent is introduced per m2 of surface to be deiced.

Preferably, no more than 500 mg of protein and no more than 500 mg of thickener are introduced per m2 of surface to be . 1O in yet another aspect of the present invention, it relates to a kit of parts for use in the process for deicing a surface. The kit of parts comprises an anti-icing composition comprising a deicing agent selected from the group consisting of sodium chloride, calcium magnesium acetate, calcium chloride, magnesium de, potassium chloride, potassium acetate, sodium e, sodium formate, and potassium formate as a component (a) and an aqueous solution comprising between 0% and its saturation concentration of the deicing agent, between 10 ppm and its saturation concentration of the native protein and n 10 ppm and its saturation concentration of the thickener as a component (b). Preferably, component (a) forms between 60 and 99.99% by weight of the kit of parts and component (b) forms between 0.01% and 40% by weight of the kit of parts (with component (a) and (b) adding up to 100%).

Component (a) can be in the form of an aqueous solution, a slurry, or a solid (vide supra).

Component (b) can also be a solid mixture of native protein and thickener.

Accordingly, the present invention also relates to a kit of parts for use in the process for deicing a surface according to the t invention sing an anti-icing composition comprising a deicing agent selected from the group consisting of sodium de, calcium ium acetate, calcium chloride, magnesium chloride, potassium chloride, potassium acetate, sodium acetate, sodium formate, and potassium formate as a component (a) and a solid 2012/060542 component comprising a native protein and a thickener as a component (b).

Preferably, component (a) forms between 90 and 99.9% by weight of the kit of parts and component (b) forms between 0.1% and 10% by weight of the kit of parts (with component (a) and (b) adding up to 100%). Component (a) can be in the form of an aqueous solution, a slurry, or a solid (vide supra).

Preferably, it is in the form of a solid.

As described above, the protein and the thickener are not equal. If the thickener is a native protein having thickener properties, a different type of native protein is added to the deicing agent.

Finally, the present invention relates to the use of a combination of a native protein and a thickener for improving the efficiency of a g composition comprising a deicing agent selected from the group consisting of sodium chloride, calcium magnesium e, calcium de, magnesium chloride, potassium chloride, potassium acetate, sodium acetate, sodium formate, and potassium formate, in the deicing of a surface. As said, said surface is preferably selected from the group consisting of rous t road, asphalt road, porous asphalt road, concrete road, bituminous road, brick road, graveled path, cobbled road, d road, and pavement.

The present ion is further illustrated by the following non-limiting Examples and Comparative Examples.

W0 2012/168205 EXAMPLES Materials: Abbreviation Material Origin H20 Water Tap water NaCl NaCI, Sanal P grade AkzoNobel, Mariager, Denmark AF Na-CMC AF2985 AkzoNobeI, Arnhem, Netherlands NC Nanocellulose, ibrous CP Kelco, Atlanta, cellulose, Axcel CG-PX USA GH Guar gum, DCol-FHG, 200 tal, Jodhpur, mesh size India LI Lignosulphonate, Borresperse Borregaard Na 244 Karlsruhe, hland SC Safecote Safecote Ltd., Northwich, UK EW spray dried egg white powder Adriaan Goede BV, Landsmeer, Netherlands EY Yolk from fresh eggs - SP spray dried powder of soy Lucovitaal, PK proteins isolate Benelux / PharmaCare, Uden WP Whey Protein trate Springfield Neutraceuticals BV, Oud-Beijerland, Netherlands Machines: Machine Origin Settings UltraTurrax, lKA $25N-1BG lKA, er: 6500-24000 rpm Avantec, Ochten, Netherlands Refrigerator -29 deg Celsius W0 2012/168205 Sample preparation In all preparations below, 22 wt—% NaCl brine is referred to as “brine”.

Possible impurities in the products are not accounted for in the calculation of the final compound concentration; this concentration is defined as the ratio of weighed amount of compound and total mass of the sample.

Compound concentrations are expressed in ppm, herewith defined as mg compound / kg total sample mass.

Stock solutions All preparations were carried out batch wise. The ned amounts represent the typical batch size at which all samples were prepared.

\/ Brine was prepared by the dissolution of 220 g NaCI into 780 9 water.

/ The protein solutions were prepared by the slow on of protein material to usly stirred brine. The brine as stirred by means of a magnetic stirrer. n stock solutions contained either 30,000 or 3,000 or 300 ppm protein.

The AF and GH solutions were ed by careful addition to vigorously stirred brine. The brine was stirred by means of an UltraTurrax. The stock solutions contained 3,000 ppm AF or CH.

The Ll solutions were prepared by addition of uiphonate powder to a vigorously stirred brine. The stock solutions contained either 3,000 ppm or 30,000 ppm Ll.

The NC dispersions were ed by careful addition to gently stirred brine. The brine was d by means of a magnetic stirrer.

Once NC is well dispersed, the obtained dispersion was subjected to the UltraTurrax. The stock solutions contained 3,000 ppm NC.

The SC stock solutions were ed by dilution of the commercially available Safecote product with brine (hereinafter denoted as a molasses comprising composition).

W0 68205 Final solutions The final sample solutions were obtained by mixing the protein and/or thickener stock solutions and the on of brine. Three examples: / Brine containing 1,000 ppm EW and 1,000 ppm AF: mixing 0 10 grams of 3,000 ppm EW stock solution 0 10 grams of 3,000 ppm AF stock solution 0 10 grams of brine / Brine containing 1,000 ppm EW and 10 ppm GH: mixing 0 10 grams of 3,000 ppm EW stock solution 0 0.1 grams of 3,000 ppm GH stock solution 0 19.9 grams of brine / Brine containing 10,000 ppm EW and 1,000 ppm SC: mixing 0 10 grams of 30,000 ppm EW stock solution 0 10 grams of 3,000 ppm SC stock solution 0 10 grams of brine All s had the exact total weight of 30 grams, contained in a r tube (PP, 50 mL, Greiner BioOne).

Experimental conditions These Greiner tubes were stored in the fridge for maximum 2 days until the start of the experiment. Upon starting the experiment, the tubes were stored in the freezer at -29°C and evaluated by eye for their solids content, with an cy of 5-10% per sample. The evaluation of solids content was done by eye, implying the estimation of solids content with respect to the total volume of the sample. All samples were prepared in three-fold and the presented solid contents are calculated as the average of all three samples.

Results Table 1 is a matrix representation of all combinations of proteins and thickeners tested at different concentrations. The ners are arranged W0 2012/168205 horizontally, with the leftmost column g the samples without thickeners. The proteins are arranged vertically, with the uppermost row showing the samples t proteins. In the grey bars, the concentrations of the corresponding additives are given in ppm (mg/kg). All numbers in the white area represent the solids content after 24 hours.

The reference samples containing either a protein or a thickener do always show high solids content, although not always 100% solids. However, after longer time all these reference samples completely solidified without exception. All other samples comprising both a protein and a thickener do not solidify completely, if at all. In all cases the solid t is much lower than that of their respective references. From this table it can be derived that there is synergy n ns and thickeners.

Table 1: Thickeners 1000 1000 1 O In Table 2, detailed results of the experiments ized in Table 1 are shown. For each entry it is mentioned which additives were present and the volume% of solids present in the sample after a certain time (in hours).

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In Table 3, the results wherein a molasses comprising composition was used as the thickener are summarized. This Table shall be interpreted the same way as Table 1. The samples containing only a es comprising composition all fully solidify within 24 hours. The addition of proteins leads to a istic effect and none of these samples completely freeze over.

Table 3: Molasses In Table 4, ed results of the experiments summarized in Table 3 are listed. For each entry it is mentioned which additives were present and the volume% of solids present in the sample after a certain time (in hours). ogfivovovo Qmomomomomo 01000000000 ONQNONONONONO OOOOOOOOCOOOOOOOOOOOOO fl # Ev 3.;338:8 EVNéEV “gmE 39V333EvTi A53;332 5. 3miEfix.“3$2Ev 05:. mgow 055 055 m5.0m 05: 8:8 055 258 226w 055 8:8 oEfi mEow 055 mgow 3: 8:8 «5: 8:8 055 mU=ow $55 mu__ow o5F 8:8 + + + + 0m + + + :oEmonEoo + om om 15m 0m 3m om >>m om E om am ow Es 0m >>m_ 2m. 2m. ow % 5% 2m. 0m m 5% 5% 5% 5% 5.. 5% 5% 5% 5% 5% 5% 5% Emu 5% ow 5% 5.. % 5mm 5% 5% 9:: 2: a 88 O82 2 9: 89 89 82 082 88 82 82 82 82 82 coop 89 2 82 02 88 O88 Nv_< 20.3 H Figures 1 -5 have been added for further illustration. The results of ative Examples A, B, and P and Example 5 (see Table 2) can be found in Figure 1 with A ->l<- representing no additives B representing 1000 ppm AF P -A- representing 1000 pm EY -I. representing 1000 ppm AF + 1000 ppm EY The results of ative Examples A, F, Q, and Example 20 (see Table 2) can be found in Figure 2, with A -*- representing no additives F -o- representing 1000 ppm GH Q -A- representing 1000 pm SP -I- representing 1000 ppm GH + 1000 ppm SP The results of Comparative Examples A, H, I, J, K, N and Examples 24, 29, 30, 31 (see Table 2) can be found in Figure 3, with A -*- representing no additives H representing 10 ppm Ll l -A- representing 100 ppm Li J -El- representing 1000 ppm LI K 4- representing 10000 ppm U N -+- enting 1000 ppm EW 29 representing 10 ppm Li + 1000 ppm EW -A- representing 100 ppm Li + 1000 ppm EW 24 .l. representing 1000 ppm Li + 1000 ppm EW 31 representing 10000 ppm Li + 1000 ppm EW W0 2012/168205 The results of Comparative Examples A, C, L, M, N, O and Examples 8, 9, 10, 11 can be found in Figure 4 with A -*- representing no additives L representing 10 ppm EW M -A- representing 100 ppm EW N -i:i- representing 1000 ppm EW 0 4- representing 10000 ppm EW C -+- representing 1000 ppm NO 8 enting 10 ppm EW + 1000 ppm NC 9 -A- representing 100 ppm EW + 1000 ppm NC -I- representing 1000 ppm EW + 1000 ppm NC 11 enting 10000 ppm EW + 1000 ppm NC The results of Comparative Examples A, J, L, M, N, Q and Examples 27, 29, 30, 31 can be found in Figure 5 with A -*- representing no ves N representing 1000 ppm EW P -A- representing 1000 ppm EY Q -El- representing 1000 ppm SP R 4- representing 1000 ppm WP U -+- representing 1000 ppm SC 34 representing 1000 ppm EW + 1000 ppm SC 36 -A- representing 1000 ppm EY + 1000 ppm SC 37 -l- representing 1000 ppm SP + 1000 ppm SC 38 representing 1000 ppm WP + 1000 ppm SC All Figures show the synergy between ns and thickeners. All grey dashed lines (samples containing only one component) go up quickly to 100% solid content, whereas all black solid lines (samples containing a mixture of protein and thickener) stay well below all grey dashed lines.

Proteic material naturally present in a molasses comprising composition clearly has no contribution to g brines liquid at very low temperatures. This is r supported by the observation that the addition of very little amounts of native protein (10 ppm) already leads to the synergistic effect (see Table 3, Table 4).

Claims (1)

1. CLAIMS 1. A deicing composition comprising (i) a deicing agent ed from the group consisting of sodium, chloride, calcium magnesium e, calcium chloride, magnesium chloride, potassium chloride, potassium acetate, sodium acetate, sodium formate, and potassium forrnate, (ii) a native protein, with the proviso that the native protein is not a protein as present in molasses, and (iii) athickener, 1O with the proviso that components (ii) and (iii) are not the same. Deicing ition according to claim 1 wherein the protein is selected from the group consisting of soy based proteins, dairy based proteins, egg proteins and combinations f. Deicing ition according to claim 1 or 2 wherein the thickener is ed from the group consisting of thickeners with a cellulosic/starch based backbone, thickeners with a guar based ne, thickeners bearing sulphonate or sulphonic acid functionality or salts thereof, and 20 thickeners bearing carboxylic acid functionality or salts f. Deicing composition according to claim 3, wherein the thickener is selected from the group consisting of carboxymethyl cellulose, salts of carboxylmethyl ose, guar gum, llulose, ethyl hydroxyethyl 25 cellulose, methylethyl hydroxyethyl cellulose, propoxycellulose, methoxycellulose, ethoxycellulose, hydroxyethylcellulose, lignin derivatives, polyacrylates, polymaleinates, and copolymers of polyacrylates and polymaleinates. 30 Deicing composition according to any one of claims 1 -4 wherein the deicing composition is - an aqueous deicing ition comprising at least 5% by weight, based on the total weight of the g composition, of deicing agent, - a solid g composition comprising at least 50% by weight, based on the total weight of the deicing composition, of deicing agent, or - a deicing composition in slurry form, comprising deicing agent in an amount higher than its saturation concentration. g composition according to any one of claims 1-5 n the protein is t in an amount of between 10 ppm and 10.000 ppm and the 10 thickener is present in an amount of between 10 ppm and 10.000 ppm. g composition according to any one of claims 1-6 wherein the thickener is carboxymethyl cellulose having a degree of substitution of between 0.4 and 1.0, and an average degree of polymerization of between 15 3000 and 8000, or a lignin derivative. Deicing composition according to any one of claims 1-7 wherein the deicing agent is sodium chloride. 20 A process for preparing a deicing composition according to any one of claims 1—8 comprising the step of spraying an aqueous treatment solution comprising a native protein, with the proviso that the native protein is not a n as present in molasses, and a ner, onto a deicing agent selected from the group consisting of sodium chloride, calcium magnesium 25 acetate, calcium chloride, magnesium de, potassium chloride, potassium acetate, sodium acetate, sodium formate, and potassium formate. 10. A process according to claim 9 wherein the deicing agent is sodium 30 chloride and the protein is present in the resulting deicing composition in an amount of between 10 ppm and 10.000 ppm and the thickener is present in the resulting deicing composition in an amount of between 10 ppm and 10.000 ppm. 11. A s according to claim 9 or 10 wherein the protein is selected from the group consisting of soy based ns, dairy based proteins, egg proteins and combinations thereof. 12. A process ing to any one of claims 9-11 wherein the thickener is selected from the group consisting of thickeners with a cellulosic/starch based backbone, thickeners with a guar based ne, thickeners bearing sulphonate or sulphonic acid functionality or salts thereof, and 10 thickeners bearing carboxylic acid functionality or salts f. 13. A process according to claim 12, wherein the thickener is selected from the group ting of carboxymethyl cellulose, salts of carboxylmethyl cellulose, guar gum, nanocellulose, ethyl yethyl cellulose, 15 methylethyl hydroxyethyl cellulose, ycellulose, methoxycellulose, ethoxycellulose, hydroxyethylcellulose, lignin derivatives, polyacrylates, polymaleinates, and copolymers of polyacrylates and leinates. 14. A process for deicing a surface, said process comprising 20 (i) the step of spreading a deicing composition according to any one of claims 1-8 onto said surface; or (ii) the steps of mixing a solid deicing agent selected from the group consisting of sodium chloride, calcium magnesium acetate, calcium chloride, magnesium chloride, ium de, potassium 25 acetate, sodium acetate, sodium formate, and potassium fom1ate with an aqueous treatment solution comprising a native protein and a thickener, and spreading the thus obtained mixture onto said surface, or (iii) the steps of preparing an aqueous solution comprising between 5% 30 by weight and the saturation concentration of a solid deicing agent selected from the group consisting of sodium chloride, calcium magnesium acetate, calcium chloride, magnesium chloride, potassium chloride, potassium acetate, sodium acetate, sodium formate, and potassium formate; a native protein and a thickener and applying said mixture onto said surface, or (iv) the steps of spreading a deicing agent selected from the group consisting of sodium chloride, calcium magnesium e, calcium chloride, magnesium chloride, potassium chloride, potassium acetate, sodium acetate, sodium formate, and potassium formate, in solid or aqueous form onto said surface and separately spreading a native protein and a thickener in solid or aqueous form onto said 10 surface. 15. Process according to claim 14 wherein the deicing agent is sodium chloride. 15 16. Process according to claim 14 or 15 n the protein is selected from the group consisting of soy based proteins, dairy based proteins, egg proteins and combinations thereof. 17. s according to any one of claims 14-16 n the thickener is 20 ed from the group consisting of thickeners with a cellulosic/starch based backbone, thickeners with a gallactomannan based backbone (like guar gum), thickeners bearing sulphonate or sulphonic acid functionality or salts thereof, and ners bearing carboxylic acid onality or salts thereof. 18. Process ing to claim 17 wherein the thickener is selected from the group consisting of carboxymethyl cellulose, salts of carboxylmethyl cellulose, guar gum, nanocellulose, ethyl hydroxyethyl cellulose, methylethyl hydroxyethyl cellulose, propoxycellulose, methoxycellulose, 3O ethoxycellulose, hydroxyethylcellulose, lignin tives, polyacrylates, polymaleinates, and copolymers of polyacrylates and polymaleinates. 19. Process ing to any one of claims 14-18 n the surface is selected from the group consisting of non-porous asphalt road, asphalt road, porous asphalt road, concrete road, bituminous road, brick road, graveled path, cobbled road, unpaved road, and pavement. 20. Process according to any one of claims 14-19 wherein between 1 and 50 g of deicing agent, between 0.01 and 500 mg of protein and between 0.01 and 500 mg of thickener is introduced per m2 of said e. 10 21. A kit of parts when used in the process according to any one of claims 14- 20, the kit of parts comprising - An anti-icing composition comprising a deicing agent selected from the group consisting of sodium chloride, calcium magnesium acetate, calcium chloride, magnesium chloride, potassium chloride, 15 potassium acetate, sodium acetate, sodium formate, and potassium formate as a component (a), and - either (i) an aqueous solution comprising n 0% and its tion concentration of the deicing agent, between 10 ppm and its tion concentration of the native protein and between 10 ppm 20 and its tion tration of the thickener or (ii) a solid component comprising a native protein and a thickener as a component (b). 22. Kit of parts ing to claim 21 with component (b) being an aqueous 25 solution comprising between 0% and its saturation concentration of the deicing agent, between 10 ppm and its saturation concentration of the native protein and between 10 ppm and its saturation concentration of the thickener and wherein component (a) forms between 60 and 99.99% by weight of the kit of parts and component (b) forms between 0.01% and 30 40% by weight of the kit of parts. 23. Use of a combination of a native protein, with the proviso that the native protein is not a protein as present in molasses, and a thickener for improving the efficiency of a g ition comprising a deicing agent selected from the group consisting of sodium chloride, calcium ium acetate, calcium de, magnesium chloride, potassium chloride, potassium e, sodium acetate, sodium formate, and potassium formate in the deicing of surfaces. 24. Use according to claim 23, wherein the surfaces are ed from the 1O group consisting of non-porous asphalt road, asphalt road, porous asphalt road, concrete road, bituminous road, brick road, graveled path, cobbled road, unpaved road, and pavement. 25. Deicing composition according to claim 1, substantially as herein described 15 with reference to any one of the Examples and/or