What it is
This copolymer combines acrylate units with a steareth-20 itaconate portion, giving it a fatty, surfactant-like side chain that lets it thicken and stabilize emulsions through associative interactions. In sunscreens and lotions it controls flow, suspends ingredients, and contributes to a smooth, stable feel. It is typically used at low levels as a rheology modifier.
Safety & warnings
Polymeric thickeners of this class are generally well tolerated, are too large to penetrate skin, and are not regarded as comedogenic at typical use concentrations.
Origin & sourcing
Synthetic; made by copolymerizing acrylic monomers with an ethoxylated stearyl itaconate component.
Questions everyone asks
What does this ingredient do?
It thickens and stabilizes emulsions and helps form a smooth, even film, improving the texture of lotions and sunscreens.
Is it a UV filter?
No. It is a formulation polymer with no UV-absorbing role.