Novel Permanent UV Absorber for Plastics

What appears to be a breakthrough in UV stabilization technology for thin films and clear molded parts has been developed jointly by Joe Webster, a well-known expert in plastics additives and president of consulting firm Stabilization Technologies LLC, Charlotte, N.C.; and The SEFA Group of Lexington, S.C., a leader in recycled minerals, primarily for concrete used in construction. The new development marks SEFA’s first foray into plastics additives as part of its diversification strategy.

Branded Permanix, this patent-pending, inorganic UV absorber reportedly features unique broad-spectrum UV absorbance from 200 to 800 nm, including the near-infrared, mid-infrared, and far-infrared regions. It reportedly provides superior UV protection and permanence even in thin films and coatings. It is composed of microscopic, spherical particles in the range of 0.5 to 10 microns. It is heat stable beyond 800 C, and can be dispersed readily in polyolefin and engineering resins. Moreover, it is not antagonistic to HALS (hindered amine light stabilizers), unlike conventional UV absorbers, and is also inert to agricultural pesticides and fumigants.

Permanix is produced using proprietary processes designed for chemically treating certain post-industrial byproducts or other waste mineral matter and removing contaminants in or on those particles. Chemical treatment can add functional groups for synergistic or multifunctional properties in uses such as compostable films. Natural-colored Permanix is compatible with colorants, and particles can be sized for use in thin films or thick parts.

Though it reportedly outperforms and outlasts fugitive organic UV absorbers, some of which are under regulatory scrutiny for toxicity, as well as other inorganics with low absorptivities and rapid oxidation rates, Permanix is priced lower than both types of competitors. It is offered in masterbatch form for ease of handling.