These non‐drying polymerized castor oils have increasing viscosities resulting from oxidative cross‐link polymerization at the double bond.2. Castor oil can be oxidized. Oxidized oils are also known as blown oils and consist of triglycerides molecules joined together with oxygen linkages to form oxidized polymers. They are manufactured under thermally controlled conditions in the presence of air to give products with increased viscosities, specific gravities and reactivity’s.3. The degree of oxidation of an oil and degree of reduction in unsaturation depends upon the amount of air/oxygen passed through an oil, the length of time of blowing and temperature, and is in direct proportion to the air/oil interface.4. Blown oils are characterized chemically by the presence of C‐O‐C links and C‐C links, with useful terminal groups such as hydroxyl and carboxyl
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