Stabilization of low‐density polyethylene films containing metal stearates as photodegradants

The effect of various stabilizer additives on Low-Density Polyethylene films with a thickness of ca. 40 μm and containing metal stearates was studied. The films were subjected to accelerated aging in a QUV Weatherometer. The apparatus was fitted with A320 lamps and operated on a dry cycle at 63°C and an irradiance of 0.67 W/m2. A phosphite (Naugard P) and a phosphate (Alkanox 240P) antioxidant provided good stabilization against UV degradation accelerated by transition metal photocatalysts such as cobalt stearate. These compounds outperformed HALS-based UV stabilizers and a metal deactivator (Irganox MD 1024) at the concentrations tested. J. VINYL ADDIT. TECHNOL., 2011. © 2011 Society of Plastics Engineers

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