Dimer acid

Dimer acid (CAS 61788-89-4) is a dimerized C18 unsaturated fatty acid produced by thermal polymerization of tall oil or vegetable oil feedstocks.

Where is Dimer acid used?

• Coatings, adhesives and lubricants: reactive building block and performance additive
• Polyamide resins: reacts with polyamines for hot-melt and solvent-based adhesives in packaging, bookbinding and footwear
• Epoxy curing systems: imparts flexibility and impact resistance in industrial coatings
• Corrosion-protective primers; polyester and polyurethane soft-segment character
• Sealants and elastomers: improves elongation and low-temperature performance
• Metalworking fluids: corrosion inhibitor and boundary lubricant in neat cutting oils and water-soluble formulations

Good to know: Buyers should confirm feedstock origin, such as tall oil versus vegetable, where bio-based content or color specifications are relevant.

Commercial specifications

• Dimerization content typically 75% to 97%
• Commercial grades differentiated by dimer content, acid value, and residual monomer and trimer levels