Polyhydroxystearic acid

Polyhydroxystearic acid (CAS 27924-99-8), also known as Poly(12-hydroxystearic acid), is a polymeric fatty acid derivative used primarily as a dispersant and rheology modifier in pigment and filler systems.

Where is Polyhydroxystearic acid used?

• Coatings and inks: disperses inorganic pigments and extenders
• Plastics: treats mineral fillers such as calcium carbonate
• Lubricants and metalworking fluids: surface-active component that improves wetting of metal surfaces and additive compatibility
• Adhesives and sealants: stabilizes filled systems and controls application rheology
• It anchors to particle surfaces and provides steric stabilization, preventing agglomeration in non-aqueous formulations.

Commercial specifications

• Purity and acid value specifications vary by supplier
• Bulk quantities; commonly offered as a neat material
• Also found as a component in pre-formulated dispersant blends