What it is
This copolymer is formed by linking dimer linoleic acid with butanediol into a flexible polyester chain. In cosmetics it acts as a film former and thickening emollient, helping create a smooth, even layer and improving the cohesion and wear of oil-based formulas. It is often used in tinted and skin-perfecting sunscreens to support pigment dispersion and a comfortable finish.
Safety & warnings
Large ester-based polymers of this type are generally well tolerated and non-sensitizing at typical cosmetic levels.
Origin & sourcing
Synthetic polyester; the dimer linoleic acid portion is derived from linoleic acid, a fatty acid commonly obtained from vegetable oils.
Questions everyone asks
What does this copolymer contribute?
It works as a film former and emollient, helping create a smooth, flexible layer and structuring the oily part of the formula.
Is it plant-derived?
It is a synthetic polymer, though the linoleic acid building block is typically sourced from vegetable oils.