What it is
Acrylates/C10-30 Alkyl Methacrylate Copolymer is a synthetic copolymer of acrylic acid and long-chain alkyl methacrylate monomers. In formulations it acts as a rheology modifier, thickening aqueous systems and stabilizing oil-in-water emulsions, and its amphiphilic structure allows it to emulsify oils with relatively little additional surfactant. It must be neutralized to develop its full thickening effect and is common in sunscreens, lotions, and gels.
Safety & warnings
This high-molecular-weight polymer is not skin-penetrating and is generally well tolerated, with a low likelihood of irritation, sensitization, or comedogenicity at typical use levels.
Origin & sourcing
Synthetic, produced by polymerizing acrylic acid with C10-30 alkyl methacrylate monomers to form a crosslinked copolymer.
Questions everyone asks
What does this copolymer do in sunscreen?
It thickens the water phase and stabilizes the emulsion, helping keep the formula uniform and giving it body.
Does it need to be neutralized?
Yes, it is typically neutralized in the formula to swell and develop its thickening and stabilizing properties.