What it is
This crosspolymer is a polyester formed by reacting adipic acid with neopentyl glycol and crosslinking the chains into a network. It is valued as a film former and texture modifier that can help bind pigments and other ingredients into an even, cohesive layer on the skin. In sunscreen sticks and balms it contributes structure and a smooth application, helping the product lay down uniformly.
Safety & warnings
This high-molecular-weight polymer is generally well tolerated on intact skin and is not expected to penetrate significantly, with a low irritation and sensitization profile. It is not a recognized fragrance allergen and is not a comedogenic oil.
Origin & sourcing
Synthetic polyester polymer made by condensing adipic acid with neopentyl glycol.
Questions everyone asks
What does this crosspolymer do in a sunscreen stick?
It acts as a film former and texture agent, helping the product apply smoothly and lay down an even, cohesive layer.
Is it an oil that could clog pores?
No. It is a large polyester polymer, not a free oil, and is not considered comedogenic.