# Patent

## Title
Deicing solution

## Abstract

A de-icing and anti-icing composition in the form of an aqueous solution which includes sugars, and an inorganic freezing point depressant in the form of a chloride salt.

## Background
CROSS REFERENCE TO RELATED APPLICATIONS
This is a continuation of U.S. Ser. No. 10/444,559 (now U.S. Pat. No. 6,827,873), filed May 23, 2003 (Granted Dec. 7, 2004) which is a continuation of U.S. Ser. No. 10/260,808, now U.S. Pat. No. 6,582,622, filed Sep. 30, 2002 (Granted Jun. 24, 2003), which is a continuation-in-part of U.S. Ser. No. 10/212,319, now U.S. Pat. No. 6,596,188, filed Aug. 5, 2002 (Granted Jul. 22, 2003), and a continuation-in-part of U.S. Ser. No. 10/212,318, now U.S. Pat. No. 6,599,440, filed Aug. 5, 2002 (Granted Jul. 29, 2003), which both are a continuation-in-part of application U.S. Ser. No. 09/971,163 now U.S. Pat. No. 6,440,325 and U.S. Ser. No. 09/971,165 now U.S. Pat. No. 6,436,310 both filed on Oct. 4, 2001 (Granted Aug. 27, 2002 and Aug. 20, 2002, respectively), which are both a continuation-in-part of U.S. Ser. No. 09/755,587, now U.S. Pat. No. 6,299,793, filed Jan. 5, 2001 (Granted Oct. 9, 2001), which is a continuation-in-part application of U.S. Ser. No.09/224,906 filed on Jan. 4, 1999, now abandoned and U.S. Ser. No. 60/070,636 filed Jan. 7, 1998, the entirety of each of the above applications which are incorporated herein by reference.


BACKGROUND OF THE INVENTION
The current state of the art for coping with snow and ice on roads usually involves applying a deicer material such as a salt to the road surface. Sometimes antiskid materials such as sand or other aggregates such as gravel are added with or without a salt.
The use of salt and compositions having high concentrations of salt, cause an undesirable corrosive effect on vehicles, the road surface, and the environment with respect to the run off of water containing salt which contaminates the surrounding land and water.
Considering the above problems associated with salt formulations, there has been a continuing need for a deicing composition or formulation which can effectively melt snow and ice yet which reduces the corrosion and environmental contamination referred to above. In response to the above problems associated with the use of road salt, the prior art has looked to alternative formulations which are less corrosive and more environmentally friendly.
U.S. Pat. No. 5,635,101 (Janke et al.) relates to a deicing composition containing a by-product of a wet milling process of shelled corn. Corn kernels are steeped or soaked in a hot solution containing small amounts of sulfurous acid. The corn kernels are separated from the steep water and steep water solubles are used in the production of a deicing composition.
U.S. Pat. No. 4,676,918 (Toth et al.) relates to a deicing composition which comprises a mixture containing at least one component selected from a number of chlorides or urea and an admixture of waste concentrate of alcohol distilling that has a dry substance content of from 200 to 750 g/kg and from 10% to 80% by weight of water.
U.S. Pat. No. 6,080,330 (Bloomer) teaches a composition for use in preventing the formation of ice or snow on outdoor surfaces, such as roadways or aggregate stockpiles, and also for deicing surfaces upon which snow or ice has formed. The composition is formed from a waste product of the process of removing sugar from sugar beet molasses, also known as desugared sugar beet molasses.
The Janke et al., Toth et al. and Bloomer materials are naturally occurring substances with hundreds (if not thousands) of components such as complex carbo-hydrates, starches, sugars, proteins etc. and are normally used with a salt.
The above de-icing solutions now being introduced in the field employ agricultural residues e.g., corn based distillers solubles and solubles from the corn wet milling industries. These naturally occurring substances, which also include brewers condensed solubles, are extremely variable in composition, viscosity, film forming tendency, freezing temperature, pH etc., and consequently give varying performance when used in de-icing solutions. Depending upon the source and batch, these materials at low temperatures sometimes exhibit such resistance to flow that they cannot be applied evenly to a road surface or mixed with a chloride, rendering them virtually unsuitable for use.
Furthermore, these patents utilize materials which have highly undesirable or unnecessary ingredients leading to practical difficulties by manufacturers and users, such as stratification in storage, biological degradation, odor, plugging of filters and spray nozzles and environmental difficulties e.g. high biological oxygen demand due to the very high organic contents (about 40% by weight), presence of phosphorus compounds and heavy metals.
To improve quality and performance, and to meet current mandated standards, there is an immediate need for synthetic, chemically modified thickeners, and carefully purified materials which can be substituted for the currently used agricultural residues. Such a formulation would improve performance and reduce metal corrosion, spalling of concrete, toxicity and addresses environmental concerns.
It is therefore an object of the present invention to provide a deicing formulation which exhibits improved performance standards which overcomes the prior art problems described above.
It is a further object of the present invention to provide a deicing formulation which utilizes a synergistic combination of a low molecular weight carbohydrate and an inorganic freezing point depressant.
It is another object of the present invention to provide a deicing formulation which utilizes a low molecular weight carbohydrate to provide for improved ice melting properties and exhibits less corrosion.
It is a further object of the present invention to provide a deicing formulation which provides consistent physical and chemical properties, thereby assuring consistent quality and performance.
It is another object of the present invention to provide an economical, highly effective deicing formulation.
SUMMARY OF THE INVENTION
The present invention is based upon the discovery that low molecular weight (about 180 to 1,000) carbohydrates when used with an inorganic freezing point depressant such as a chloride salt has a synergistic effect upon freezing point depression. The formulation of deicing/anti-icing compositions employs carbohydrates of less than about 1,000 molecular weight, such as glucose/fructose, disaccharides, trisaccharides, tetrasaccharides, pentasaccharides, hexasaccharides, and mixtures thereof. The broader operative range for the carbohydrate molecular weight is from about 180 to 1,500, with the range of about 180 to 1,000 being preferred.
The basic composition of the present invention consists of at least the first two of the following three components in aqueous solution depending upon ambient weather conditions, terrain, nature and amount of freezing/snow precipitation, and environmental concerns:

    
    
        (1) Inorganic freezing point depressants preferably in the form of chloride salts which include magnesium chloride, calcium chloride and sodium chloride. Metal acetates e.g. calcium magnesium acetate, and other suitable acetates may also be used.
        (2) Low molecular weight carbohydrates in the 180 to 1,500 range (180-1,000 preferred). These carbohydrates can be obtained from a wide range of agricultural based products such as those derived from corn, wheat, barley, oats, sugar cane, sugar beets etc.
        (3) Thickeners are used in certain applications as the third key component to increase the viscosity of the composition so that the liquid remains in contact with the road surface or with the solid particles in piles of rocksalt/sand, or rocksalt/aggregates, or salt alone, or sand or aggregate. Thickeners are mainly cellulose derivatives or high molecular weight carbohydrates. Typical molecular weights for cellulose derivatives are for methyl and hydroxy propyl methyl celluloses from about 60,000 to 120,000 and for hydroxy ethyl celluloses from about 750,000 to 1,000,000. Carbohydrate molecular weights range from about 10,000 to 50,000.
    
    


These components are used in an aqueous solution in the following concentrations:















Weight %









Carbohydrate
 3 to 60



Inorganic Freezing



Point Depressant
 5 to 35



Thickener
0.15 to 10  










In a further embodiment of the present invention it has been found that certain low molecular weight sugars function as highly effective carbohydrates in the above formulations.
The above described compositions provide a de-icing and anti-icing formulation which can be formulated more uniformly to provide for more consistent properties from batch to batch, while at the same time providing for increased ice melting properties.


DETAILED DESCRIPTION OF THE INVENTION
In the development of the present invention it was determined that the predominant organic constituents in the prior art formulations described above were carbohydrates, and in one series of tests, Brewers Condensed Solubles (BCS),which was selected as a test sample, was diluted with water and separated into several fractions by the addition of increasing amounts of an ethanol/methanol 85/15 v/v mix. The characteristic of the various fractions and their freezing points when mixed with 15% magnesium chloride are tabulated below.











TABLE 1








%






ethanol/


Freezing



methanol
%
%
Point












Sample
added
Solids
Carbohydrates
° F.
° C.















Brewers (BCS)
NIL
43.6
43.1
−31.9
−35.5


Fraction A
60
5.3
3.8
−10.1
−23.4


Precipitate


Fraction B
74
3.7
3.2
−10.8
−23.8


Precipitate


Fraction C
82
2.8
2.1
−10.3
−23.5


Precipitate


Fraction D
85
1.3
0.6
−9.9
−23.3


Precipitate


Fraction E 
85
30.7
29.8
−22.7
−30.4


Solubles









Fraction A consisted of essentially insoluble, high molecular weight polysaccharides, whereas Fractions B to D inclusive gave gummy residues of polysaccharides. Fractions A to D had little effect upon freezing point depression. Fraction E, the largest component, had a considerable effect upon freezing point and is a mixture of lower molecular weight polysaccharides.
Fraction E was also examined for ice melting characteristics at 25° F. (−4° C.) in admixture with magnesium chloride employing SHRP H-205.2 Test Method for Ice Melting of Liquid Deicing Chemicals.










TABLE 2








Lbs weight ice melted per



Deicing Solution
lb weight of inorganic salt



















15% magnesium chloride, control
16.9



Brewers BCS/Mg Cl2
18.2



Fraction E/Mg Cl2
19.3



32% calcium chloride
7.3



26.3% sodium chloride
7.5










The last two figures were calculated from data in SHRP H-205.2. These results indicate the appreciable improvement over the commonly used sodium and calcium chlorides in ice melting characteristics when Fraction E and Brewers BCS are mixed with magnesium chloride. There is also a 14% improvement over the control when Fraction E is used. This, together with freezing point depression improvement indicates that an appreciably improved deicing solution can be formulated.
The next stage of the investigation consisted of attempting to isolate and define the active components in the Brewers BCS. This was done by first filtering employing a 0.45 micron membrane followed by ultrafiltration using a Model UFP-1-E-s (A/G Technology Corporation, Needham, Mass.) with a nominal cutoff at a molecular weight of 1000 and finally gel permeation chromatography (GPC) using a Waters LC Module 1 unit with a set of three ultrahydrogel columns and 50 mm Na2 HPO4 solution at pH7 as the mobile phase. The brewers BCS liquor had two major carbohydrate fractions (a) a low molecular weight fraction with the majority of components having a molecular weight of less than 1000, and (b) a high molecular weight fraction containing compounds with a molecular weight of 12,600 but with some components in the 1000 to 10,000 molecular weight range. Fraction E was found to have a chromatographic profile very similar to the low molecular weight fraction (a) above with a molecular weight of less than 1000. Cane Sugar DCS liquor had more components than the Brewers BCS but had similar high and low molecular weight fractions with similar molecular weight distributions.
In order to confirm that the low molecular weight fraction has the greatest effect upon freezing point depression, a further series of freezing points were measured using in this instance, Dead Sea Salt Solution from Jordan in lieu of laboratory grade magnesium chloride. Again the concentration of magnesium chloride was 15% by weight for all samples.











TABLE 3










Freezing Point












Sample
° F.
° C.















Control: Industrial grade magnesium
−0.4
−18.0



chloride solution/Water



Brewers(BCS)
−31.9
−35.5



Brewers GPC High Mol Wt Fraction
−5.1
−20.6



Brewers GPC Low Mol Wt Fraction
−16.4
−26.9



Brewers BCS Fraction E
−13.4
−25.2










It was thus shown that low molecular weight (less than 1000) carbohydrates had the greatest effect upon freezing point depression. Based upon these experiments, it was concluded that the formulation of deicing/anti-icing compositions should employ compounds in the less than 1000 molecular weight range such as those tabulated below in Table 4:










TABLE 4







Carbohydrate
Molecular Weight









Glucose/fructose
180



Disaccharides
342



Trisaccharides
504



Tetrasaccharides
666



Pentasaccharides
828



Hexasaccharides
990










There is available commercially a wide range of carbohydrates with varying carbohydrate compositions. An evaluation was conducted using simple sugars, disaccharides and polysaccharides in an attempt to determine the effect of molecular weight and solute concentration upon freezing point. The concentration of magnesium chloride used in the test was 15% by weight. The test results for simple carbohydrates and complex carbohydrates are tabulated below in Tables 5 and 6 respectively.







TABLE 5







SIMPLE CARBOHYDRATES









Carbohydrate
% Concentration of
Freezing Point











Type
Name
Carbohydrate
° F.
° C.














Control
Mg Cl2 (15%)
Nil
−4.7
−20.4


Sugar
Fructose
25.0
−8.9
−22.7


Sugar
Fructose
50.0
−18.2
−27.9


Sugar
Fructose
75.0
−31.9
−35.5


Sugar
Glucose
30.0
−11.4
−24.1


Sugar
Glucose
65.0
−37.3
−38.5


Disaccharide
Maltose
25.0
−8.3
−22.4


Disaccharide
Lactose
25.0
−11.7
−24.3
















TABLE 6







COMPLEX CARBOHYDRATES












Freezing




% Concentration
Point











Carbohydrate
of Carbohydrate
° F.
° C.
Comments














Control Mg Cl2
Nil
−4.7
−20.4



(15%)


Corn syrup-
30
−5.6
−20.9
Contains glucose,


high maltose



maltose and






maltotrisoe


Corn syrup-
65
−19.1
−28.4


high maltose


Corn syrup
25.0
−9.9
−23.3
Average Mol. Wt.


solids DE20



3746


Corn syrup
25.0
−11.6
−24.2
Average Mol. Wt.


solids DE44



1120


Corn syrup
50.0
−21.3
−29.6


solids DE44


Corn syrup
65.0
−27.0
−32.8


solids DE44









It can be seen from the results above that glucose is better than fructose and of the two dissaccharides lactose is somewhat better than maltose. The corn syrup DE20 has about 47% of mono to hexasaccharides and the DE44 grade has about 69%, and the latter grade is slightly better in reducing freezing point. Also Table 6 shows that there is a relationship between carbohydrate concentration and freezing point thus allowing various formulations to be developed.
More complex carbohydrates were also evaluated such as dextrins and maltodextrins which are derived by hydrolysis (enzymatic or via dilute mineral acids) of corn starch. In addition a series of thickeners were evaluated. The control magnesium chloride solution was prepared from the hexahydrate in Table 7 below which shows the results obtained. Again all samples contained 15% by weight of magnesium chloride.










TABLE 7









Freezing





Point












Compound
% Concentration
° F.
° C.
Comment














Control 15% Mg
Nil
+3.4
−15.9



Cl2


Dextrin
5.0
−4.7
−20.4


Maltodextrin
5.0
−4.7
−20.4


DE5


Maltodextrin
9.1
−17.1
−27.3
Lower Mol. Wt than


DE15



DE 5


Hydroxyethyl
0.33
+1.2
−17.1
Thickener


cellulose 250


HHR


Carboxymethyl
1.0
+2.5
−16.4
Thickener


cellulose


Gum arabic
3.6
−1.8
−18.8
Thickener


Gum tragacanth
0.2
−3.3
−19.6
Thickener


470









The Maltodextrin DE15 exhibits good results due to the lower molecular weight components present and the higher concentration. The higher the molecular weight, the less the influence upon freezing point. Some thickeners were unstable in the presence of magnesium chloride e.g. carboxy methyl cellulose, and so lose their efficacy as thickeners.
It is also important to define the chloride salt content for deicing/anti-icing liquids, the higher the chloride salt content, the lower the freezing point and the higher the ice melting characteristics. These characteristics are shown by the data in Table 8 below for Mg Cl2 and Ca Cl2 at varying salt and carbohydrate concentrations.










TABLE 8








% salt
% Carbo-



Chloride
by
hydrate
Freezing Point 











Salt
weight
by weight
° F.
° C.














Mg Cl2
22.7
18.0
Less than −47
Less than −43.9


Mg Cl2
15.0
25.5
−22
−30


Ca Cl2
29.6
18.6
Less than −47
Less than −43.9


Ca Cl2
17.5
4.1
−5.4
−20.8


Ca Cl2
15.0
4.1
−0.6
−18.1









As the concentrations of salts and carbohydrates increase the freezing point of the mixtures decrease. In the case of calcium chloride at a fixed carbohydrate concentration of 4.1% an increase of 2.5% by weight of Ca Cl2 decreased the freezing point by 4.80° F. (2.670° C.). Again formulations can be varied to suit local conditions. Care must be taken as salt concentrations approach the eutectic point on the freezing point—concentration curve where the freezing point can rise and the salt can crystallize out. The aqueous solution has a viscosity of about 0.1 to 3 poises at 25° C.
From the above discussion and laboratory evaluations the basic composition consists of at least the first two of the following components in aqueous solution depending upon ambient weather conditions, terrain, nature and amount of freezing/snow precipitation, environmental concerns, etc:

    
    
        (1) An inorganic freezing point depressant in the form of inorganic electrolytes, mainly chlorides, but also others, such as sulfates and acetates, and could be used in concentrations of about 5 to 35 wt %. The main types employed are magnesium chloride, calcium chloride and sodium chloride.
        (2) A carbohydrate, especially lower molecular weight carbohydrates in a range of about 180 to 1500. A preferred range is about 180 to 1,000. The carbohydrates can be obtained primarily from a wide range of agricultural based products such as those derived from corn, wheat, barley, oats, sugar cane, sugar beet, etc.
        (3) Thickeners which are used in a concentration of about 0.15 to 10 wt % to increase the viscosity of the compositions so that the liquid remains in contact with the road surface or with the solid particles in piles of rock salt/sand, or rock salt/aggregates, or rock salt alone, or sand or aggregate. Thickeners are mainly cellulose derivatives such as methyl cellulose, hydroxy ethyl cellulose, hydroxy propyl methyl cellulose, hydroxy propyl cellulose, etc. or high molecular weight carbohydrates.
    
    


The corrosivity of deicing/anti-icing liquids is important due to the effect upon automobiles, other road transport vehicles, bridges, reinforcing rods (rebars) in concrete structures such as bridge decks, ramps and parking garage decks.
The testing of liquids for corrosivity can be quite complex and there are a number of tests developed by organizations such as ASTM and the National Association of Corrosion Engineers (NACE). The test conditions and metals must approximate those experienced in practice such as aerobic conditions and cold rolled steel specimens. Prior art tests using nails immersed in liquid contained in a screw top bottle are not meaningful mainly because of the anaerobic conditions and the variation in metal substrate composition, the degree of cold working and cleanliness.
Satisfactory test methods include SHRP H205.7 Test Method for Evaluation of Corrosive Effects of Deicing Chemicals or Metals (Handbook of Test Methods for Evaluating Chemical deicers SHRP-H332, Strategic Highway Research Program, National Research Council, Washington, D.C.) And the test described in the Deicer Specifications for the Pacific Northwest States of Idaho, Montana, Oregon, Washington. The latter is based upon the NACE Standard test Method for the Laboratory Corrosion Testing of Metals. TM0169-95.
Some corrosion rate results employing SHRP H205.7 showing corrosion inhibition due to carbohydrate presence are tabulated below in Table 9.









TABLE 9







% Chloride

Corrosion Rate (mils per year) 











Salt
% Carbohydrate
One Week
Three weeks
Six weeks














15% Na Cl
Nil
5.97
4.66
5.48


15% Mg
Nil
2.58
1.93
1.73


Cl2


15% Mg
4.1
0.89
0.61
0.40


Cl2









As can be seen from the data in Table 9, the carbohydrate magnesium chloride formulation reduces the corrosion rate of steel by 92.7% as compared to sodium chloride alone and 76.9% as compared to magnesium chloride alone. Formulations as shown in Examples III and IV (q.v.) were tested for corrosivity employing the Pacific Northwest States protocol and there was a reduction in the corrosion rate compared to sodium chloride solution of 57.2% for Example III and 40.4% for Example IV. This again shows corrosion inhibition properties.
The following examples are exemplary of various specific embodiments of the present invention which are useful as deicing agents:
EXAMPLE I














Component
Part by Weight









Corn Syrup Solid DE 44
22.5



Industrial grade magnesium
50.0



chloride solution*



2% Methocel Solution
 2.0



Colorant (Caramel YT25)
 0.5



Water
25.0



Freezing Point (ASTM-D 1177–94)
−12.5° F./−24.7° C.



Viscosity at 77°:
20 centipoise



Appearance:
Gold color, clear




solution



Odor:
Mild, pleasant







*Note: Industrial grade magnesium chloride solution is a commercially available magnesium chloride solution also containing calcium chloride, sodium chloride, potassium chloride.






EXAMPLE II














Component
Parts by Weight









High maltose corn syrup
31.5



Industrial grade magnesium
50.0



chloride solution



Colorant (Caramel YT25)
 0.5



Water
18.0



Freezing Point (ASTM-D 1177-94):
−22° F./−30° C.



Viscosity at 77° F.
14.4 centipoises



Appearance
Gold color, clear




solution



Odor
Mild, pleasant










EXAMPLE III














Components
Parts by Weight









High Maltose Corn Syrup
22.2



Industrial grade magnesium
70.0



chloride solution



Water
 7.8



Freezing point (ASTM-D 1177-94)
Less than −47° F./−43.9° C.



Appearance
Clear, light brown,




mobile liquid



Odor
Mild, pleasant



Specific gravity
 1.27



Viscosity at −94° F./−70° C.
Heavy syrup, flows










EXAMPLE IV














Component
Parts by Weight









High Maltose Corn Syrup
20.5



43% CaCl2
72.3



Water
 7.2



Freezing Point (ASTM-D 1177-94)
Less than −47° F./−43.9° C.



Appearance
Clear, colorless, mobile




liquid



Odor
Mild, pleasant



Specific Gravity
 1.33



Viscosity at −47° F./−43.9° C.
Very heavy syrup










EXAMPLE V














Component
Parts by Weight









High Fructose Corn Syrup
19.55



43% Calcium Chloride Solution
73.15



Water
 7.30



Freezing Point (ASTM-D 1177-94)
−31° F./−35° C.



Appearance
Clear, colorless, mobile




liquid



Specific Gravity
 1.38



Odor
Mild, pleasant










EXAMPLE VI














Component
Parts by Weight









Glucose
32.5



Industrial grade magnesium
50.0



chloride solution



2% Methoeel Solution
 2.0



Colorant (Caramel YT25)
 0.5



Water
15.0



Freezing Point (ASTM-D 1177-94)
−38.2° F./−39.0° C.



Appearance
Gold color, clear




solution



Odor
Mild, pleasant










Colorants may also be used to enable applicators to see where the deicer has been deposited. Non-toxic colorants which may be used include caramel solutions and food grade dyes.
In a further embodiment of the present invention it is desirable to use sugars in combination with a chloride salt. For purposes of this invention sugars include mono- to decasaccharides which have molecular weights from 180 to 1638. Sugars within this molecular weight range have a synergistic effect upon freezing point depression. Beyond this molecular weight of about 1638 the synergistic effect rapidly decreases.
Note that for substantially the same concentration of MgCl2 that the three formulation using sugars exhibited a lower freezing point than MgCl2 alone.











TABLE 10










Viscosity





Mg
Ford Cup
Freezing




Chloride %
No. 4
Point













Concentration
by Weight
(Sec.)
° C.
° F.















Maltodextrin
5.04
15.0
13
−20.4
−4.7


No. 5


Molasses
18.8
14.9
13
−24.9
−12.8


Maltodextrin 
9.1
15.0
11
−27.3
−17.1


No.15


Aqueous
None
15.0
—
−15.9
+3.4


Magnesium


Chloride


Reference


Solution









Mixed sugar solutions are obtained commercially by the hydrolysis of starches and other polysaccharides obtained from corn, wheat, rice etc. A wide range of products are available which are defined by the Dextrose Equivalent Value (DE Value) and the saccharides distribution in the hydrodyzate solution. The Dextrose Equivalent is a measure of the amount of simple sugars i.e. mono- and disaccharides, and typified by glucose, fructose, maltose, sucrose and lactose. Pure glucose has a DE Value of 100. The saccharides distribution uses “DP” as a shorthand term for the varous saccharides e.g. DP1 is for monosaccharides, DP2 for disaccharides and so on.
The Maltodextrin No. 5 is a hydrolyzed product having a DE 5 value and has the following saccharide distribution i.e. mixture of sugars:












TABLE 11







Saccharide

% by Weight
Molecular Weight





















Mono-
DP1
0.9
180



Di-
DP2
0.9
342



Tri-
DP3
1.0
504



Tetra-
DP4
1.1
666



Penta-
DP5
1.3
828



Hexa-
DP6
1.4
990



Hepta-
DP7
1.5
1152



Octa-
DP8
1.4
1314



Nona-
DP9
1.4
1476



Deca-
DP10
1.3
1638



Undeca-
DP11+
87.8
—










The grade of molasses listed in the Table is Molasses No 677 available from International Molasses Corporation Ltd., of New Jersey and has the













Fructose
 7 to 11% by weight


Glucose
 7 to 11% by weight


Sucrose
30 to 36% by weight


Total sugars
45 to 52% by weight


Ash i.e. inorganic (phosphates, Ca, K, Mg, Na)
11.5% maximum


Cellulosics, high mol wt. compounds
16 to 23% by weight


Total Solids
79 to 80%


Water
20 to 21%.









The molecular weight of the carbohydrate for the molasses used is between 180 and 342. The weight average molecular weight for molasses is between about 280 and 290 depending upon the saccharide mixture composition.
The Maltodextrin No. 15 is a hydrolyzed corn starch product having a DE (Dextrose Equivalent) of 15 having the following saccharide distribution i.e. mixtures of sugars.












TABLE 12







Saccharide

% by Weight
Molecular Weight





















Mono-
DP1
1.3
180



Di-
DP2
4.1
342



Tri-
DP3
6.0
504



Tetra-
DP4
4.6
666



Penta-
DP5
5.2
828



Hexa-
DP6
7.6
990



Hepta-
DP7
6.3
1152



Octa-
DP8
4.4
1314



Nona-
DP9
3.5
1476



Deca-
DP10
3.0
1638



Undeca-
DP11+
54.0
—










As the hydrolysis of the polysaccharide solution is allowed to proceed the DE Value increases as does the low molecular weight sugars:









TABLE 13









% Concentration By Weight

















Greater


DE Value
Product
DP1
DP2
DP3
Than DP4















5
Maltodextrin No 5
0.9
0.9
1.0
97.2


15
Maltodextrin No. 15
1.3
4.1
6.0
88.6


25
Cleardex 25 AE/42
5.0
6.0
11.0
78.0


36
Cleardex 36/43
14.0
11.0
10.0
65.0


43
Cleardex 43/43
19.0
14.0
12.0
55.0


52
Cleardex 52/43
28.0
18.0
13.0
41.0


60
Cleardex 60/44 IX
31.0
36.0
10.0
23.0


66
Cleardex 66/43
40.0
35.0
8.0
17.0


97
Cleardex 95/37
95.0
3.0
0.5
1.5









Here Cleardex is a trademark of the Cargill Foods Corporation.
The low DE Value materials give higher viscosity solutions than the high DE Value solutions whereas the latter have a greater synergistic effect on freezing point depression. Combining these effects allows appreciable flexibility in formulating deicing and anti-icing compositions.
While the present invention has been particularly shown and described herein with reference to various preferred modes it will be understood by one skilled in the art that various changes in detail may be effected therein without departing from the spirit and scope of the invention as defined by the claims.

## Claims

1. A method of forming a de-icing and anti-icing composition which comprises:
(a) providing an aqueous solution which contains sugars and a chloride salt, and
(b) applying said aqueous solution to a source of particulate material selected from the group consisting of salt, sand and aggregates and mixtures thereof; and
(c) where said sugars and chloride in said aqueous solution are present in the following concentration: 














Wt %









Sugars
3 to 60



Chloride salt
5 to 35



Water
Balance










and where the molecular weight of the sugars is in the range of about 180 to 1638.

2. The method of claim 1 in which the chloride salt is at least one selected from the group consisting of sodium chloride, magnesium chloride and calcium chloride.

3. The method of claim 1 in which the aqueous solution has a viscosity of about 0.1 to 3 poises at 25° C.

4. The method of claim 1 in which the sugars are obtained by the hydrolysis of starches and other polysaccharides obtained from the group consisting of corn, wheat, rice and mixtures thereof.

5. A method for deicing and anti-icing an outdoor surface comprising: applying the particulate composition of claim 1 to the outdoor surface.

6. A method of forming a de-icing and anti-icing composition which comprises:
(a) providing an aqueous solution which contains 3 to 60 wt % sugars and 5–35 wt % chloride salt, balance water and
(b) applying said aqueous solution to a source of particulate material selected from the group consisting of rock salt, sand and aggregates and mixtures thereof whereby said aqueous solution forms a coating on said particulates.

7. The method of claim 6 in which the chloride salt is at least one selected from the group consisting of sodium chloride, magnesium chloride and calcium chloride.

8. The method of claim 6 in which the molecular weight of the sugars is in the range of about 180 to 1638.

9. The method of claim 6 in which the aqueous solution has a viscosity of about 0.1 to 3 poises at 25° C.

10. The method of claim 6 in which the sugars include a mixture of mono to decasaccharides having a molecular weight of up to about 1638.

11. The method of claim 6 in which the sugars are obtained by the hydrolysis of starches and other polysaccharides obtained from the group consisting of corn, wheat, rice and mixtures thereof.

12. A method for deicing and anti-icing an outdoor surface comprising: applying the particulate composition of claim 6 to the outdoor surface.