ABSTRACT
Ultraviolet (UV) stabilization of polypropylene (PP) systems containing flame retardants proves to be a difficult technical challenge. The reason for this difficulty is expanded on later. However, generation of acidic products from bromine-based flame retardants during processing or exposure can cause a catastrophic deactivation of the hindered amine light stabilizer (HALS). An understanding of the mechanism for generation of acidic products from aliphatic-and aromatic-based flame retardants has led to formulation approaches based on flame-retardant structure.
