Benzoate is a free radical scavengers that in some cases also act as UV absorbers. Hydroxybenzoates can perform synergistically with HALS to provide superior performance.
For example the Omnistab UV 1, which is a liquid formamidine type ultraviolet absorber. Used for a wide range of polymers and applications including polyurethane, polyvinylchloride(PVC), acryl resin and polyester etc. Imparts very good light stability.
Or Omnsitab UV 3638, which offers very strong and broad UV absorption with no color contribution. Possesses very good stabilization for polyesters and polycarbonates. Provides low volatilty. Imparts high UV screning efficiency.