Dodecylbenzene sulfonates , formulations

The control and reproducibility of particle size and particle size distribution is important to the quality of acrylic and styrene-acrylic latex products. Particle size has large effects on latex viscosity and the rheology of formulated products and may also exert subtle effects on the end-use peiformaiKe properties. The particle size is controlled primarily by the choice and amount of surfactant, or by the use of seed latexes. A recoit article [32] addresses the use of surfactants to control particle size in semi-continuous acrylic polymmzations. Many surfactants are reconunended by surfactant manuhicturras for the preparation of acrylic and styrene-acrylic latexes [33]. Sodium lauryl sulfate, sodium dodecylbenzene sulfonate, sulfosuccinates and the aUtylphonl ethoxylates ate typical. The patent literature contmns many discussions of the use of single [34] or multiple [3S] polymer seed latexes to control particle size. 

Chem. Descrip. Branched sodium dodecylbenzene sulfonate CAS 25155-30-0 EINECS/ELINCS 246-680-4 Uses Emulsifier for emulsion polymerization (SBR, vinyl acetate, vinyl chloride, styrene, and acrylic latexes), paints/coatings emulsifier, dispersant for agric. formulations surfactant for washing fruits and vegetables food pkg. adhesives, paper defoamer in food-contact paper/ paperboard emulsifier in mfg. of food-contact articles Regulatory FDA 21 CFR 175.105,175.300,175.320,176.170,176.180, 176.200,176.210,178.3400 exempt from tolerance under EPA40CFR 180.1001 (c) (e) BGA XIV compliance Properties Flakes pH 6.0-9.5 (10%) surf. tens. 32 dynes/cm ( CMC) anionic 98% act. 

F = fair G = good H = heavy W = weak VG = very good (as far as optimized, top-quality formulations are concerned) DDES dodecylbenzene sulfonate(s)... 

Two anionic surfactants are predominant in toothpaste formulations. These are SLS and sodium dodecylbenzene sulfonate (SDOBS) that exhibits excellent foaming properties. A good quality and quantity of foam may be obtained by mixing SLS and SDOBS. Sodium lauroyl sarcosinate (HjC (CH2)ioCON(CH3)CH2COONa) was used extensively in dentifrices, but was found to be a cause of oral mucosal irritation. Nowadays, its use is limited. Surfactants also play the role of inhibitor of enzymes responsible for tooth decay. 

Surface active compounds are often effective to potentiate the activity of the microbiddes. It is observed that the lower the content of volatile organic carbon in a paint the more important is the formulation of a preservative to transport the active ingredient to the location within the multiphase system where it is needed. Frequently, an optimum balance of membrane-activity and reactivity of the second active ingredient against microorganisms in complex matrices has to be found. It can be demonstrated that surface active compounds [II, 18.] like e.g. quaternary ammonium salts, fatty amine derivatives, ethoxylated alcohols or dodecylbenzene sulfonic add potentiates the activity of bactericides like BIT, MIT. 

Chem. Descrip. Calcium dodecylbenzene sulfonate Ionic Nature Anionic Chem. Anaiysis 1% max. moisture Uses Emulsifier for liq. formulations... 

Chem. Descrip. Calcium dodecylbenzene sulfonate/oleyl alcohol ethoxylate Ionic Nature Anionic Uses Surfactant for agric. formulations Emulsogen INA [Clariant/Functional Chems.)... 

The material prepared from the lower-molecular-weight fraction is commercially referred to as dodecylbenzene and the higher, as tridecylbenzene. The so-called tridecyl material is actually a mixture of mostly C12 and C14 isomers the exact mixture depends on the manufacturer. The tridecylbenzene sulfonate, in general, shows better detergent properties and better foaming in soft water, whereas dodecylbenzene sulfonate has a lower cloud point and better viscosity behavior in liquid formulations. 

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