RCOO2Ca

RCOO2Ca is the generic formula for a calcium carboxylate, the salt formed when a divalent calcium ion coordinates with two carboxylate groups of carboxylic acids, commonly written as Ca(RCOO)2. In this class of compounds the calcium center is typically bridged by carboxylate ligands, and solid structures often form polymeric networks. The long hydrocarbon R groups in many commercial carboxylates confer hydrophobic character and very low water solubility, while some derivatives can be sparingly soluble in polar solvents.

Preparation and occurrence: Calcium carboxylates are produced by neutralizing fatty acids with calcium bases, such as calcium hydroxide or calcium oxide. A representative reaction is 2 RCO2H + Ca(OH)2 → (RCOO)2Ca + 2 H2O. They occur naturally as metal soaps in products derived from fats and oils and are widely manufactured for industrial use. Common examples include calcium stearate, calcium palmitate, and calcium oleate.

Applications: Calcium carboxylates serve as rheology modifiers, thickeners, lubricants, and anti-caking or release agents in a range of industries. In cosmetics and personal care, calcium stearate acts as a thickener and emollient; in plastics, rubbers, and coatings they function as lubricants, processing aids, and stabilizers; in construction, certain calcium soaps enhance waterproofing and workability. Their properties as metal soaps also underpin use in inks, paints, and food-processing aids in some contexts.

Safety and handling: Generally of low acute toxicity, though fine powders can irritate the eyes, skin, or lungs; standard industrial hygiene and handling practices apply, including avoidance of inhalation of dust.

Common examples: calcium stearate, calcium palmitate, calcium oleate.