Title: Bentoquatam
CAS Registry Number: 1340-69-8
CAS Name: Quaternium 18-bentonite
Additional Names: bis(hydrogenated tallow alkyl)dimethylammonium complex with sodium bentonite
Trademarks: Bentone 34 (Rheox); Ivy Block (Enviroderm); Tixogel VP (United Catalysts)
Literature References: Ion exchange addition product of the montmorillonite clay, bentonite, q.v., and quaternium-18, a dimethyl, ditallow quaternary ammonium salt containing predominantly C18 alkyl chains. Acts as a barrier to block urushiol, q.v., from the skin. Prepn of aliphatic ammonium bentonites: E. A. Hauser, US 2531427 (1950); and organophilic properties: J. W. Jordan, J. Phys. Colloid Chem. 53, 294 (1949); idem et al., ibid. 54, 1196 (1950). Use as stationary phase in GSC and HPLC: D. W. Grant et al., J. Chromatogr. 99, 721 (1974). Description of properties, toxicology and use in cosmetics: J. Am. Coll. Toxicol. 1, 71-83 (1982). Clinical trial in poison ivy/oak dermatitis: J. G. Marks, Jr. et al., J. Am. Acad. Dermatol. 33, 212 (1995).
Properties: Hydrophobic, thixotropic organoclay with gel-like consistency. Expansible in water, methanol, ethanol, isopropanol, sorbitol, glycerine, acetone. Heat stable up to 500°. Resists base or acid attacks over pH range of 3-11.
Use: Emulsion stabilizer in cosmetics. Stationary phase in chromatography.
Therap-Cat: Barrier for the prevention of allergic contact dermatitis.
Benzal Chloride Benzaldehyde Benzalkonium Chloride Benzamide Benzanilide

Bentonite is an absorbent aluminium phyllosilicate, essentially impure clay consisting mostly of montmorillonite. The absorbent clay was given the name bentonite by Wilbur C. Knight in 1898, after the Cretaceous Benton Shale near Rock River, Wyoming.[1][2]

There are different types of bentonite, each named after the respective dominant element, such as potassium (K), sodium (Na), calcium (Ca), and aluminium (Al). Experts debate a number of nomenclatorial problems with the classification of bentonite clays. Bentonite usually forms from weathering of volcanic ash, most often in the presence of water. However, the term bentonite, as well as a similar clay called tonstein, has been used to describe clay beds of uncertain origin. For industrial purposes, two main classes of bentonite exist: sodium and calcium bentonite. In stratigraphy and tephrochronology, completely devitrified (weathered volcanic glass) ash-fall beds are commonly referred to as K-bentonites when the dominant clay species is illite. Other common clay species, and sometimes dominant, are montmorillonite and kaolinite. Kaolinite-dominated clays are commonly referred to as tonsteins and are typically associated with coal.