Abstract
The role of hindered amine light stabilizers (HALS) in the protection of polyolefins continues to expand. HALS are essential components in formulations developed for outdoor use and have been proven to be effective thermo-oxidative stabilizers. The physicochemical properties of hindered amines have a profound effect on the hindered amine’s performance as a stabilizer, and will also influence the reactivity of the HALS with other formulation components, environmental agents, etc. Some of these interactions can have a deleterious effect on end product aesthetics and service life.
Studies on the relationship between HALS structure and performance have led to the development of new products which provide optimal light stabilizing efficiency while minimizing the tendency to undergo undesirable side reactions with system components or external agents. These new products and their application in PP fibre, PE film, and other applications will be described.