Dimer acid

Dimer acid (CAS 61788-89-4) is a dimerized C18 unsaturated fatty acid produced by the thermal polymerization of tall oil or vegetable oil feedstocks. It functions as a reactive building block and performance additive across coatings, adhesives, and lubricant formulations.

In polyamide resin synthesis, this chemical reacts with polyamines to produce hot-melt and solvent-based adhesives used in packaging, bookbinding, and footwear. Epoxy curing systems incorporate it to impart flexibility and impact resistance in industrial coatings.

Corrosion-protective primers benefit from its inclusion, while polyester and polyurethane formulators use it to introduce soft-segment character. This improves elongation and low-temperature performance in various sealants and elastomers.

Metalworking fluid manufacturers add it as a corrosion inhibitor and boundary lubricant in neat cutting oils and water-soluble formulations. It is supplied as a viscous amber liquid, with dimerization content typically ranging from 75% to 97%.

Standard commercial grades are differentiated by dimer content, acid value, and residual monomer and trimer levels to suit specific resin or lubricant applications. Technical and industrial grades are the norm for most manufacturing processes.

Buyers should confirm feedstock origin, such as tall oil versus vegetable, where bio-based content or color specifications are relevant. This ensures the material meets the specific requirements of the final chemical formulation or industrial application.