What it is
This is a copolymer made from long-chain olefins together with isopropyl maleate and maleic anhydride units. It functions as an oil-phase film former and binder, helping to disperse and hold mineral and pigment particles within a uniform layer on the skin. In mineral sunscreens it is valued for improving the evenness and staying quality of the protective film.
Safety & warnings
This polymeric ingredient is large and substantive, sitting on the skin surface rather than penetrating, and is generally well tolerated with a low expectation of irritation or sensitization at use levels. It is most often found in oil-based mineral formulas; no notable comedogenicity or allergen concerns are commonly associated with it.
Origin & sourcing
Synthetic; produced by polymerizing long-chain olefins with maleate and maleic anhydride monomers.
Questions everyone asks
What does this copolymer do in mineral sunscreen?
It acts as a film former and binder, helping spread mineral particles evenly and keep the applied layer cohesive.
Does it provide UV protection itself?
No. It is a structuring and film-forming polymer, not a UV filter.