New amphoteric surfactant containing a 2-hydroxyalkyl group: III. Performance of binary systems of amphoteric/anionic surfactants

The performance of new amphoteric surfactants, N-(2-hydroxyethyl)-N-(2-hydroxyalkyl)-β-alanines (HAA), and their oxyethylated derivatives (HAA-nEO) was studied in blends with conventional anionic surfactants. Viscosity, ultraviolet (UV) spectroscopy, surface tension, foaming power, dye solubilization and detergency were measured for the blends of various compositions. The interaction between HAA and sodium linear alkylbenzene sulfonate (LAS) was discussed with respect to the deviation of molar extinction coefficient in the UV spectra. A complex formation was assumed. A notable change in viscosity of 1.0% aqueous solutions was observed at pH 8.0 for the compositions of HAA/LAS (3:1) and HAA/sodium lauryl sulfate (4:1). The binary systems exhibited excellent detergency and other surface active properties, and indicated synergistic effects at a certain weight ratio. Human and rabbit skin irritation also was evaluated.     

Tallow based detergent formulations: Mixtures of alcohol sulfates,salts ofa-sulfo acids and esters,and soap

Saturated (I, ROSO₃Na) and unsaturated (II, R’OSO₃Na) tallow alcohol sulfates, the disodium salt ofa-sulfonated saturated tallow fatty acids (III, RCH(SO₃Na)CO₂Na), the sodium salt of the methyl ester ofa-sulfonated saturated tallow fatty acids (IV, RCH(SO₃Na) CO₂CH₃), and commercial tallow soap flakes (V) were compared, singly and in combinations, as built and unbuilt solutions in soft and hard water, with respect to foam height and detergency, using four different types of standard soiled cotton. Built solutions of combinations of the two most soluble detergents, II and IV, at concentration 0.05% total active ingredient plus 0.20% builder in hard water of 300 ppm, remained perfectly clear on standing for several months. Built solutions containing I or II had the best foaming properties. The presence of soap decreased foam height. Cloths A and B showed the detergency of built solutions to be in the order I=II>IV>III>V, and all combinations containing I or II were superior detergents. With cloth C, detergents ranked in the order I=II=IV>III>V, and many combinations containing I or II with IV were synergistic. Cloth D did not distinguish sharply between detergents in built solutions in hard water. In general, detergent systems containing tallow alcohol sulfates witha-sulfo esters had the most desirable solubility, wetting, foaming, and detergent properties. Presented at the AOCS Meeting, Philadelphia, October 1966. E. Utiliz. Res. Dev. Div., ARS, USDA.     

Performance characteristics of sucrose ester detergents

Standard heavy duty household laundering formulations were prepared from a series of well-characterized sucrose ester surfactants. The detergency and redeposition performance of these formulations was measured by the soil accumulation method, using for comparison standard formulations based on sulfated and sulfonated surfactants. Also measured were the lime soap dispersing power, and the tendency to leave residual adsorbed deposits on the fabric. The sucrose ester series as a whole performed at least as well in detergency as the standard anionics, and retained their effectiveness at lower concentrations. They showed about the same, or slightly less, tendency than the anionic controls to build up organic residues on the fabric, both series being much superior to soap in this respect. In redeposition performance and lime soap dispersion the sucrose esters were outstandingly better than any of the standard anionic controls. Within the sucrose ester series, the C₁₈ esters gave generally better performance than the shorter chain esters, and the saturated esters tended to be better than the unsaturated.     

Detergency and foaming properties of the system alkylarylsulfonate-soap-sodium carboxymethyl cellulose

Summary A study has been made of the detergency and foaming characteristics of a ternary system comprising a sodium alkylarylsulfonate, a medium titer soap derived from tallow and coconut oil, and sodium carboxymethyl cellulose under average conditions prevailing in household laundering. The carbon soil removal and whiteness retention properties of unbuilt soap are equalled or exceeded in compositions containing approximately five parts soap to one part alkylarylsulfonate, with a minor portion of CMC. Measurements made in a transparent cylindrical washer indicate that the decrease of foam height due to adsorption on fabric and hard water is much greater with soap than with alkylarylsulfonate. This results in greater foam volumes with alkylarylsulfonate than with soap at concentrations less than 0.2%, in water of hardness equivalent to 96–114 ppm. CaCO₃. Sodium carboxymethyl cellulose, when used with soap and alkylarylsulfonate in the proportions desirable for improvement of detergency, does not affect foaming properties significantly. When soap is the major ingredient in mixtures of soap and alkylarylsulfonate, foam height is critically dependent on concentration. When alkylarylsulfonate predominates, high foam levels are obtainable at low concentrations. The data reported permits selection of compositions from the ternary system for formulation with builders such that excellent detergency characteristics may be obtained under average conditions prevailing in household service, with high foaming characteristics as desired for agitator-type machines, or with moderate, controllable foaming for cylinder machines. Presented at the 43rd annual meeting, American Oil Chemists' Society, Houston, Tex., April 29, 1952.     

Soap-based detergent formulations: VI. Alkylaryl sulfonamide derivatives as lime soap dispersing agents

Alkylbenzenes, such as industrial detergent alkylates, as well as pure 1-phenylalkanes whose side chain lengths varied C₈−C₁₂, were converted into the corresponding alkylbenzenensulfonyl chlorides with chlorosulfonic acid. Surface active sulfonamides were obtained from the reaction of the sulfonyl chlorides with various low mol wt aminosulfonic acids, such as N-methyltaurine, or with aminoalkyl esters of sulfuric acid, such as 2-aminoethyl hydrogen sulfate. The hydrolytic stability of the resulting surface active sulfonamide derivatives was investigated. As expected, the sulfonates were quite resistant to acid or alkaline hydrolysis, while the sulfates were more susceptible to hydrolysis. Hydrolytic stability of the sulfonamides was compared with that of the analogous fatty acid amide sulfactants. All of the compounds were excellent lime soap dispersing agents giving Borhetty-Bergman values of 4–10. The compounds were evaluated for detergency either alone or formulated either with tallow soap or with tallow soap and sodium silicate (Na₂O/SiO₂ ratio of 1∶1.6) The derivatives of the pure hydrocarbons which gave the best overall detergency were those of 1-phenyldecane and 1-phenyldodecane, whereas those of 1-phenyloctane exhibited poor detergency. This ranking was observed when the compounds were tested alone as well as when formulated. The sulfonamide derivatives of the detergent alkylate type of alkylbenzenes exhibited excellent detergency characteristics and showed substantial potentiation of detergency when mixed with soap or with a soap-sodium silicate blend. The detergency performance of some of these formulated detergents was equal to that of a commercial household detergent used as a control.     

Soap-based detergent formulations: XVIII. Effect of structure variations on surface-active properties of sulfur containing amphoteric surfactants

Quaternary ammonium amphoteric surfactants have been found in the past to be excellent lime soap dispersing agents and detergents but exhibit unusual solubility behavior. In search of a relationship between chemical structure and surface-active properties, compounds having the following general formula were synthesized: ZN⁺(CH₃)₂(CH₂)_nX⁻, where Z is C₁₂H₂₅-, C₁₄H₂₉-, C₁₆H₃₃-, or C₁₅H₃₁CONHC₃H₆-, n is 2, 3, or 4 and X is SO₃- or OSO₃-. Tertiary amines were converted to sulfobetaines (X=SO₃-) by reaction with (a) butanesultone (n=4), (b) propanesultone (n=3), or (c) sodium 2-bromoethanesulfonate (n=2). An alternate synthesis for the sulfoethylbetaines (n=2) involved the reaction of the tertiary amines with ethylene bromide, followed by treatment with sodium sulfite. All sulfated quaternary ammonium compounds (X=OSO₃-) were synthesized by treatment of the tertiary amine with the appropriate chloroalcohol, followed by sulfation with chlorosulfonic acid. The sulfated quaternary ammonium amphoterics are stable to acid hydrolysis, and alkaline stability improves with increasing bridge chain length. Sulfoethyl amphoterics are less water soluble than sulfobutyl, which in turn are less soluble than sulfopropyl derivatives of the same alkyl chain length. For the most part, the sulfated amphoterics are insoluble but are solubilized by soap. The lime soap dispersing properties improve as the carbon chain bridge length increases for both the sulfates and sulfonates. Formulations of tallow soap, amphoteric surfactant, and sodium silicates gave good detergency in most cases. Presented at the AOCS meeting, Dallas, April 1975.     

Soap-based detergent formulations: II. Oxyethylated fatty amides as lime soap dispersing agents

Nonionic surface active agents with two oxyalkyl chains were prepared from the triethylamine catalyzed reaction of ethylene oxide with diethanolamides of palmitic, stearic and tallow fatty acids. The addition of 4 moles of ethylene oxide was required to render these diethanolamides water soluble, whereas 9 moles were required to make the corresponding monoethanolamide soluble. Efficiency of lime soap dispersion increased as oxyethyl chain length was increased. Best detergency of soap-nonionic combinations was achieved when the oxyethyl chain length was at the minimum required for water solubility. Theγ-hydroxyethanolamides and -diethanolamides were prepared by the uncatalyzed reaction of the corresponding amines withγ-stearolactone. These compounds became water soluble at lower levels of oxyethylation, but the lime soap dispersing power and detergency were not improved over those of corresponding compounds derived from stearic acid. Presented at the AOCS Meeting, Los Angeles, April 1972. E. Market. Nutr. Res. Div., ARS, USDA.     

Soap-based detergent formulations: XXIII. Synthesis of p-sulfobenzyl ammonium inner salts and structural correlation with analogous amphoterics

Two series of p-sulfobenzyl ammonium inner salts, RN⁺(CH₃)₂CH₂C₆H₄SO₃⁻ and RCONH(CH₂)₃N⁺−(CH₃)₂CH₂C₆H₄SO₃⁻, where R is a straight chain alkyl group, were prepared by sulfonation of the corresponding quaternary ammonium chlorides. Although both series have excellent lime soap dispersion properties, the former series gave optimum detergency at considerably shorter alkyl chain length than the latter serires. The detergency, lime soap dispersion ability, and solubility of these compounds were compared with those of structurally analogous aliphatic sulfobetaines. Structural variations, such as length and nature of the bridge between the cationic and anionic groups, length of the lipophilic chain, and insertion of an amidopropyl group into the lipophilic portion of the molecule, significantly altered the detergency and solubility but not the lime soap dispersing ability of the amphoterics.     

Soap and lime soap dispersants

In recent decades, soap has largely been replaced by petrochemicals and polyphosphates as the major components of laundry detergents in the U.S. Currently, the use of soap is primarily confined to the toilet soap bar field, and technological advances here have been mainly in processing. In view of the rising costs and increasing scarcity of petrochemicals and polyphosphates, tallow, a replenishable, inexpensive agricultural by-product, was examined as an alternate raw material. Tallow soap has a long history of efficacy and safety but suffers from poor performance in hard water and insolubility in cold water. It has now been shown that the performance of soaps can be drastically improved in cold water solubility and in hard water detergency by the addition to the soap of lime soap dispersing agents (LSD A). These are anionic or amphoteric surfactants possessing one or more bulky polar groups. These soap-LSDA combinations form mixed micelles in water and essentially take on the surface active characteristics of a single anionic surfactant. Soap-LSDA combinations wash well in hard water without curd formation; they can be “built” with various materials such as phosphates and trisodium nitrilotriacetate (NTA) to enhance detergency. Soap-LSDA combinations equal the conventional detergents in every performance respect and undergo biodegradation more readily and completely.     

Laundry Detergency of Solid Nonparticulate Soil or Waxy Solids: Part II. Effect of the Surfactant Type

In this work, methyl palmitate with a melting point around 30°C was used as a model of waxy soil. Its detergency was evaluated with a hydrophilic surface (cotton) or a hydrophobic surface (polyester) using different surfactants: alcohol ethoxylate (EO9), sodium dodecyl sulfate (SDS), methyl ester sulfonate (MES), methyl ester ethoxylate (MEE), and two extended surfactants (C_12,14-10PO-2EO-SO₄Na and C_12,14-16PO-2EO-SO₄Na). The detergency efficiency at a 0.2 wt.% surfactant and 5 wt.% NaCl gradually increased while redeposition gradually decreased with increasing washing temperature in most studied surfactant solutions; this was observed both above and below the melting point of methyl palmitate on both studied fabrics. If the methyl palmitate was heated above the melting point when deposited on the fabric, it was better able to penetrate into the fabric matrix as compared to deposition below the melting point, resulting in poorer detergency for heated deposition, particularly for washing temperatures lower than the melting point. Among the surfactants studied, the nonionic surfactant (EO9) showed the highest detergency efficiency (73–94%) at any washing temperature especially on the polyester fabric. For washing temperatures below the melting point, detergency performance correlated well with the contact angle of surfactant solution on the solid methyl palmitate surface for all studied surfactants when salinity was varied. In this work, conditions resulting in the highest detergency below the melting point corresponded to the highest detergency above the melting point, suggesting this as a systematic approach to formulating below the melting point of the soil. Charge of particles or fabric was not observed to be important to the detergency mechanism, but steric factors resulting from surfactant adsorption were observed to be important mechanistic factors in waxy solid detergency.     

Soap-based detergent formulations: XXVI. Hard water detergency of soap-lime soap dispersant combinations with builders and inorganic salts1

Blends of soap and 3 lime soap dispersants—the sulfated tallow alkanolamide (TAM), the coconut-oil-derived amido sulfobetaine (CAHSB) and the cocoamido betaine (CAB)—were formulated with 3 builders—sodium tripolyphosphate (STPP), trisodium nitrilotriacetate (NTA) and trisodium 2-oxa-1,1,3-propane tricarboxylate (OPT). Varying amounts of sodium sulfate were added to these formulations, and the effects of builders and sodium sulfate on detergency at 300 ppm water hardness were studied. At levels below 60%, STPP was not an effective builder for TAM formulations. Dilution of STPP-built TAM formulations with sodium sulfate substantially decreased detergency. Detergency of TAM formulations was improved by incorporation of NTA or OPT and such formulations could tolerate dilution with sodium sulfate without serious loss in detergency. NTA or STPP improved the detergency of CAB formulations but OPT did not. Addition of sodium sulfate caused some loss in detergency in all CAB formulations. Addition of STPP to CAHSB formulations caused a slight loss in detergency, but addition of NTA or OPT had no appreciable effect. Dilution of STPP-built CAHSB formulations with sodium sulfate affected detergency adversely, although not as severely as in STPP-built TAM formulations. Dilution of NTA-or OPT-built CAHSB formulations with sodium sulfate had little effect on detergency. CAB and particularly CAHSB are superior to TAM in dispersing lime soap curd. Therefore, addition of NTA, STPP, or OPT to the amphoteric formulations did not affect detergency to the same extent as in TAM formulations. Further evidence of the superiority of amphoteric lime soap dispersing agents (lsda) in dispersing lime soap curd was provided by the effectiveness of soap, CAHSB, silicate formulations in detergency studies at 1,000 ppm water hardness. Presented at the Annual AOCS Meeting, San Francisco, April 1979. Agricultural Research, Science and Education Administration, U.S. Department of Agriculture.     

Soap-based detergent formulations: X. Nature of detergent deposits

The cumulative deposition of detergent residue on unsoiled cotton and polyester-cotton permanent press finish cloth was determined for a variety of detergent formulations after washing 25 consecutive times in 300 ppm hard water in a laboratory Tergotometer. Included in this study were: a phosphate-built laundry detergent, two carbonate-built detergents, tallow soap and various tallow soap formulations with anionic and amphoteric lime soap dispersing agents, and a glassy sodium silicate. Sample swatches washed with each formulation were analyzed for calcium, magnesium, and organic acid content. Fabric washed with the carbonate detergents showed the highest calcium and magnesium content, while those washed with the phosphate detergent and the soap-lime soap dispersant-builder formulations had the lowest. Fabric washed with soap alone had a much higher fatty acid residue than those washed with the other detergent formulations. However, the amount of organic acids left on the fabric after washing with a soap-lime soap dispersing agent formulation was no greater than that produced by phosphate- and carbonate-built detergents. The presence or absence of deposits also was verified visually with a scanning electron microscope. Each formulation also was tested for detergency by measuring the soil buildup in a multiwash procedure. Generally, the buildup of soil paralleled the deposit of detergent residue on the unsoiled cloths.     

The synthesis and surface active properties of certain amphoteric compounds

In order to gain some insight into the correlation between chemical structure and surface active properties, a number of amphoteric surface active agents were synthesized. All of these compounds possessed both a quaternary ammonium group and an anionic functional group. The anionic functional group was either a carboxylate, sulfonate, or a sulfate group. The molecules possessed either one or two fat-derived long chains. In general, the detergency of the single chain compounds was superior to that of the double chain compounds. On the other hand, the double chain compounds showed better fabric softening than single chain compounds. The compatibility with anionic and non-ionic detergents and soap was also studied. It was observed that there were considerable variations in the degree of compatibility with respect to detergency. In general, anionics of the alkylaryl sulfonate type and soap are incompatible with these amphoterics, while non-ionics appear to be more compatible.     

Experiments in the formulation of heavy duty liquid detergents from tallow

Several tallow-based detergents were investigated in simplified formulations comprising ca. 10~15% active ingredient, 4% foam stabilizer, 10% isopropyl alcohol, 20% K₄P₂O₇ and 50~55% water, 1% with respect to carboxymethylcellulose. Disodium 2-sulfoethyl α-sulfostearate or sodium oleate could be used as the only active ingredient or in blends with other tallow-based compounds. The presence of a soluble form of the tallow alcohol sulfates, sodium 9,10-dichlorooctadecyl sulfate, gave maximum detergency in hard water. Presented at the AOCS Meeting, Minneapolis, 1963. E. Utiliz. Res. and Dev. Div., ARS, USDA.     

Cold Water Detergency of Triacylglycerol Semisolid Soils: The Effect of Salinity,Alcohol Type,and Surfactant Systems

Cold water detergency of triacylglycerol semisolid soils is much more challenging than liquid vegetable oils due to poorer interaction between surfactants and semisolid soil. This research seeks to improve the removal efficiency of semisolid soils below their melting points using surfactant-based formulations containing different alcohol additives. To this end, cold water detergency of solid coconut oil and solid palm kernel oil was investigated in various surfactant/alcohol systems, including single anionic extended surfactants, single nonionic alcohol ethoxylate surfactants, and a mixture of anionic surfactants. A series of alcohols (2-butanol, 1-hexanol, 1-heptanol, 1-octanol, 1-nonanol, and 1-decanol) were added to the surfactant formulations to investigate cold water detergency improvement. While cold water detergency using surfactants alone was poor, it was considerably improved when optimum salinity (S*) and 1-heptanol, 1-octanol, or 1-nonanol were introduced to the studied surfactant formulations. The maximum detergency of solid coconut oil exceeded 90% removal in the 0.1 w/v% C_14-15-8PO-SO₄Na/0.2 w/v% 1-octanol/4 w/v% NaCl system (a final optimized surfactant system) at a washing temperature of 10°C versus 22.9 ± 2.2% in the surfactant alone (not at optimum salinity and no additive). Further analysis showed that improved cold water detergency using surfactant/intermediate-chain alcohols/NaCl could be correlated with high wettability (low contact angle) as well as favorable surfactant system-soil interaction as observed by lower interfacial tension values. In contrast, the improved cold water detergency was observed to be independent of dispersion stability. This work thus demonstrates that surfactant system design, including additives, can improve cold water detergency of semisolid soils and should be further explored in future research.     

Interfacial activity of narrow-range alcohol oxyethylates

Surface and interfacial tension isotherms for narrow-range distribution ALFOL 1214 alcohol oxyethylates were determined and compared with those obtained for broad-range alcohol oxyethylates. Various adsorption parameters were estimated. The effectiveness of surface tension reduction decreases when the length of polyoxyethylene hydrophile increases. Micellization is observed at log cmc ranging from −4.7 to −3.3. Effects of the length and distribution of the polyoxyethylene chain on cmc are very small. A minimum of A _min/N _av ^0.5 is obtained for N _av=8, where A _min and N _av denote the minimum interfacial area occupied by a statistical molecule at the saturated interface and the average degree of oxyethylation, respectively. The interface becomes saturated at pC ₂₀=−5.61±0.35, where pC ₂₀ denotes the logarithm of concentration required to obtain the surface pressure equal to 20 mNm⁻¹. The highest and lowest values of the surface excess at saturation and the free energy of adsorption, respectively, are obtained for an average degree of oxyethylation equal to 8. Parameters are correlated with the average degree of oxyethylation and the oxyethylene chain distribution parameter according to empirical second-order polynomials. Small differences in adsorption abilities at the water/air interface are only observed for narrow- and broad-range distributed oxyethylates. The differences become important for adsorption at the hexadecane/water interface. The lowest values of interfacial tension are obtained for narrow-range oxyethylates with N _av=7 and 8. The Krefeld fabric detergency tests indicated that the best detergency was observed for alcohol oxyethylates with N _av=5–7. Narrow-range oxyethylates exhibit somewhat better washing abilities than the broad-range products. No relationship between detergency of alcohol oxyethylates and their abilities to adsorb at the water/air and water/hydrocarbon interfaces is observed.     

Soap-based detergent formulations I. Comparison of soap-lime soap dispersing agent formulations with phosphate built detergents

Blends of soap with small amounts of lime soap dispersing agents are efficient detergents in hard water and require little or no tripolyphosphate builder. Lime soap dispersing agents examined include sulfated ethoxylated fatty alcohols, sulfated N-(2-hydroxyethyl) fatty amides, methyl esters of α-sulfo fatty acids, 2-sulfoethyl fatty acid esters and N-methyl-N-(2-sulfoethyl) fatty amides as well as nonionics derived from tallow alcohols. Detergency evaluations were carried out with three commercial soiled cotton cloths as well as by a laboratory multi-wash technique. Formulations containing 80% soap, 10% lime soap dispersing agent and 10% builder gave optimum detergency values. Builder effectiveness was rated tripolyphosphate>silicate (1:1.6)> metasilicate = citrate = oxydiacetate = nitrilotriacetate>carbonate≫sulfate. The detergency of soap-lime soap dispersed combinations compared favorably with a standard brand household heavy duty granular detergent in 50, 150 and 300 ppm hardness water on three soiled cloths. Presented at the AOCS Meeting, Atlantic City, October 1971. East. Market. Nutr. Res. Div., ARS, USDA.     

Comparative value of fatty acids and resin acids of tall oil in soaps

Summary A study has been made of the detergency and foaming power of soaps made from a typical acid-refined American tall oil. Sodium soap of tall oil, straight tall oil fatty-acid soap, and straight tall oil resin-acid soap were evaluated. The effect of fatty acid-resin acid ratio was determined by using mixtures of those soaps. Sodium rosinate, sodium oleate, and mixtures of these soaps were used as comparison standards. Curves plotted show wash-test data and foaming values as functions of the ratio of fatty soap to resin soap. The data indicate in terms of detergency: a) tall oil soap has a higher value than sodium rosinate; b) sodium oleate is better than tall oil fatty-acid soap, but the latter is approximately equivalent to soaps from various unsaturated vegetable oils; c) both tall oil resin-acid soap and rosin soap have low detergency on cotton; d) the detergency of most mixtures of tall oil fatty-acid and resin-acid soaps at lower concentrations is greater than would be predicted from the individual soaps, indicating a synergistic effect. As a rough approximation, tall oil soap without unsaponifiables is equivalent to a corresponding mixture of sodium oleate and sodium rosinate. The presence of unsaponifiables lowers both detergency and foaming. Tall oil soap is somewhat less sensitive to hard water than sodium oleate. Significant differences between detergencies of soaps, and especially between soap mixtures, are obscured when launderometer tests are run at moderate soap concentrations. These differences are readily detected at lower concentrations. Presented at 113th meeting of the American Chemical Society, Chicago, Ill., April 14–23, 1948.     

Surface active agents from isopropenyl esters: Acylation of isethionic acid and N-methyltaurine

Acylation of sodium isethionate with isopropenyl stearate at 200 C for 30 min gave a 95% yield of sodium 2-sulfoethyl stearate, acetone being the only byproduct. Acylation of N-methyltaurine at 200 C for 90 min gave a 95% yield of N-methyl-N-(2-sulfoethyl) stearamide sodium salt. Corresponding surface active derivatives were also prepared from pelargonic, lauric, myristic, palmitic, oleic, phenylstearic and hydrogenated tallow fatty acids from their respective isopropenyl esters. Detergency, foam height, wetting time, lime soap dispersing power, critical micelle concentration and other surfactant properties were evaluated. Optimum properties were found at the C₁₄−C₁₈ fatty acid chain length. Unsaturation or branching increased solubility. The 2-sulfoethyl esters were similar to the N-methyl-N-(2-sulfoethyl) amides in foam height, wetting ability and lime soap dispersing power, superior to the N-methyl-N-(2-sulfoethyl) amides in detergency, but inferior in calcium stability and less stable to acid and alkali. Both compounds are readily biodegraded. The fatty isopropenyl ester synthesis has an advantage in yield and purity of the product and could increase the utilization of the 2-sulfoethyl esters and N-methyl-N-(2-sulfoethyl) amides in many applications. Presented at the ISF-AOCS Meeting in Chicago, September 1970. Deceased. E. Mark. Nutr. Res. Div., ARS, USDA.     

Soap-based detergent formulations: XIII. Formulations with alpha-olefin sulfonates as lime soap dispersants

Heavy duty household type detergents were formulated from tallow soap-AOS(α-olefin sulfonate)-builder combinations. Various commercial AOS samples were evaluated. These were derived either from closely fractionated α-olefins such as C₁₄, C₁₆, and C₁₈ or from samples representing broader mol wt ranges such as C₁₄−C₁₆ and C₁₆−C₁₈. The builders incorporated into these combinations were a sodium silicate (Na₂O∶SiO₂=1∶1.6), sodium tripolyphosphate, sodium citrate, sodium carbonate, and trisodium nitrilotriacetate. Detergency evaluations of 0.2% solutions in 300 ppm hard water (as CaCO₃) were determined with three commercial soiled cloths and by a multiwash test in which clean cloth was repeatedly soiled and washed. The relative proportions of soap, AOS, and builder were varied to obtain maximum detergency, and comparisons were made to other soap-LSDA (lime soap dispersing agents)-builder combinations as well as to a commercial high phosphate detergent used as a control. Detergency performance of soap-AOS combinations ranked just below that of the commercial high phosphate detergent control and below that of soap formulations containing sodium methyl α-sulfotallowate. Presented at the AOCS meeting, Philadelphia, September 1974.