AND SUMMARYThis paper describes the preparation of C19 dicarboxylic acid by the Koch reaction with carbon monoxide and sulfuric acid of oleic, tall oil fatty, and partially hydrogenated tall oil fatty acids. The effects of changing reaction conditions upon the yield and purity of the product were examined. With the best conditions, it was possible to prepare light-colored, heat-stable C19 dicarboxylic acid in 83% overall weight yield at 96% purity, containing 75% tertiary isomers and 25% secondary.
The preparation and properties of polyamide hot-melt adhesives derived from Koch C-19 diacid are described. They are comparable to those of commercial C-36 dimer acid-based polyamides for bonding leather and metals and somewhat superior to those of polyamides made from C-19 diacid derived from a hydroformylation process.
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