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.

It functions by anchoring to particle surfaces and providing steric stabilization, preventing agglomeration in non-aqueous formulations. In coatings and inks, it disperses inorganic pigments and extenders.

This material is highly effective in solvent-borne and high-solids systems, improving color development and reducing viscosity. Plastics compounders use it to treat mineral fillers such as calcium carbonate.

By treating titanium dioxide with this polymer, manufacturers enable higher filler loadings without sacrificing processability. In lubricant and metalworking fluid formulations, it acts as a surface-active component.

The additive improves wetting of metal surfaces and enhances additive compatibility. Adhesive and sealant manufacturers incorporate it to stabilize filled systems and control application rheology during use.

Polyhydroxystearic acid is supplied as a viscous liquid or low-melting solid, depending on molecular weight and grade. Technical grade is the standard commercial offering for industrial use.

Purity and acid value specifications vary by supplier, ensuring the material meets specific formulation needs. It is available in bulk quantities and is commonly offered as a neat material for production.

The product can also be found as a component in pre-formulated dispersant blends. This versatility makes it a staple for manufacturers seeking reliable performance in complex chemical systems.