Overview
Isostearic acid is a branched-chain fatty acid derived from oleic acid through isomerization. Its unique molecular structure provides distinct advantages over linear fatty acids, including improved solubility and stability. As a non-food-grade chemical, it serves specialized industrial and cosmetic applications where its branching prevents crystallization. The production typically involves catalytic processes using mineral acids or enzymes. Major manufacturers are located in Europe, North America, and Asia, with global production estimated at 20,000-30,000 metric tons annually. The material is commonly traded in 180-200kg drums or bulk containers for industrial users.
Physical and Chemical Properties
Isostearic acid's branched structure gives it lower viscosity and melting point compared to stearic acid, making it easier to handle at room temperature. The material shows excellent oxidative stability due to reduced reactive sites, with peroxide values typically below 5 meq/kg. Its acid value ranges 180-200 mg KOH/g, confirming high purity. Unlike linear fatty acids, isostearic acid remains liquid at lower temperatures and demonstrates better compatibility with non-polar substances. These properties stem from disrupted molecular packing caused by methyl branching, which also contributes to its enhanced solubility in hydrocarbons and esters.
Main Applications
In cosmetics, isostearic acid functions as an emollient and viscosity modifier in creams, lipsticks, and sunscreens, valued for its non-greasy feel and skin compatibility. The personal care industry consumes approximately 40% of global production. It's particularly favored in anhydrous systems and stick formulations. Industrial applications include synthetic lubricants where it serves as a base stock or additive, providing excellent lubricity in metalworking fluids and greases. Other uses encompass plasticizer intermediates, textile auxiliaries, and corrosion inhibitors. Emerging applications include 3D printing resins and biodegradable polymer formulations.
Safety and Storage
Classified as non-hazardous under GHS standards, isostearic acid requires standard chemical handling precautions. Use nitrile gloves and eye protection when handling bulk quantities. The material is stable under normal conditions but should be protected from strong oxidizers. For storage, maintain containers tightly sealed to prevent moisture absorption and oxidative degradation. Shelf life typically exceeds two years when stored properly in carbon steel or polyethylene containers. Discard material showing significant discoloration (dark yellow/brown) or rancid odor, indicating oxidation byproducts.
B2B Procurement Guide
Industrial buyers should specify technical grade (90-95% purity) for most applications, with cosmetic grade requiring additional certifications like ECOCERT or ISO 16128. Key purchasing factors include acid value (target 190±5), iodine value (<10), and color (APHA <200). Major suppliers include Croda, Oleon, and KLK OLEO. Consider regional production for logistics efficiency - Asian suppliers often offer competitive pricing for APAC buyers, while European producers lead in cosmetic-grade material. Minimum order quantities typically start at 1 metric ton, with price breaks at 5-ton and container-load quantities.
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