U. V. Resistant Polyacetals

Acetal copolymer grades stabilized against ultraviolet light deterioration have been commercially available for two decades. These grades exhibit good retention of mechanical properties upon extended exposure to ultraviolet light but suffered from a surface appearance problem of discoloration, bleaching, and chalk formation, A new ultraviolet light stabilization system has been developed for acetal copolymers which demonstrates excellent property and surface appearance retention upon accelerated UV light exposure.