Stearic Acid

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stearic acid

[′stir·ik ′as·əd]
(organic chemistry)
CH3(CH2)16COOH Nature's most common fatty acid, derived from natural animal and vegetable fats; colorless, waxlike solid, insoluble in water, soluble in alcohol, ether, and chloroform; melts at 70°C; used as a lubricant and in pharmaceuticals, cosmetics, and food packaging.

Stearic Acid

 

(also n-octadecanoic acid), CH3(CH2)16COOH, a monobasic saturated aliphatic carboxylic acid. The acid takes the form of colorless crystals and has a melting point of 69.6°C and a boiling point of 376.1°C. It is insoluble in water but soluble in ether. Stearic acid is one of the most common higher fatty acids in nature; glycerides of stearic acid are the main component of many fats and oils, from which stearic acid is isolated by hydrolysis, usually in the form of stearin—a mixture of stearic and palmitic acids. Stearic acid may be obtained by fractional precipitation or distillation from stearin and by the hydrogenation of oleic acid. Alkali salts of stearic acid are soaps. Pure stearic acid is used in organic synthesis and in analytical chemistry, where it serves to identify Ca, Mg, and Li, while technical-grade acid is used as a dispersing agent of the ingredients and a vulcanization activator in the production of rubber. The stearates of sodium, lithium, calcium, lead, and other metals are used as constituents of lubricating greases. Stearic acid and its esters are used in the production of cosmetics.

References in periodicals archive ?
7,553,480 B2; Pure USA, LLC, East Brunswick, NJ, has patented a topical personal care composition that consists of hydrocortisone (1%), water (q.s.), cocoamidopropyl hydroxysultaine (30-40%), PEG-6000 distearate (5-10%), panthenol (1-5%), lauramide DEA (1-5%), panthenyl ethyl ether (0.5-0.9%), lauramide DEA (and) linoleamide DEA (0.5-0.9%), glycol stearate (0.1-0.5%), fragrance (0.10.5%), phytantriol (0.1-0.5%); methylparaben (0.1-0.3%), propylparaben (0.1-0.3%), sodium benzoate (0.1-0.3%), methylchloroisothiazolinone (<0.1%) and methylisothiazolinone (<0.1%).
Cognis) 1.50 (Propylene glycol stearate) Crodamol SS (Crude) 0.75 (Cetyl eaters) DC 200 Fluid (100 cst) (Dow Corning) 1.00 (Dimethicone) Glycerin 0.50 Prepylparaben 0.10 Phase D Deionized water 5.00 Germal II (ISP) 0.20 (Diazolidinyl urea) Phase E Multifruit BSC (Arch) 3.00 (Water, bilberry (vaccinium myrtiltus) extract, sugar cane (saccharum officia narum) extract, sugar maple (acer saccharinum) extract, orange (citrus aurantium dulcis) extract, lemon (citrus medica limonium) extract) PROCEDURE: Slowly add Veegum Ultra to the water and mix for 15 minutes using homogenizer at 5500 rpm.
Water (deionized) 47.55 Dowicil-200 (Dow Chemical) 0.20 (quaternium-15) Polyderm PPI-SI-WI (Alzo International) 0.50 (Bis-PPG-15 dimethicone IPDI/copolymer) Polyderm PPI-SA-15 (Alzo International) 1.00 (IPDI/PEG-15 soyamine copolymer) Dermowax EGMS (Alzo International) 0.75 (glycol stearate) Foamtaine CAB-G 40% 20.00 (cocamidopropyl betaine) Bio-Terge 40% 10.00 (sodium alpha olefin sulfonate) Foamox CDO 35% (Alzo International) 10.00 (cocamidopropylamine oxide) Stepanol WA Paste 30% (Stepan Co.) 10.00 (sodium lauryl sulfate) Color q.s.