SYNERGISTIC STABILIZER COMPOSITIONS FOR COLOR STABLE PIGMENTED THERMOPLASTIC POLYMERS IN PROLONGED CONTACT WITH WATER

摘要

The invention relates to synergistic stabilizer compositions comprising Hindered Amine Stabilizers (HAS), phenolic antioxidants, and, if appropriate, UV-absorbers, for pigmented thermoplastic polymers, especially for polyolefin pipes and other polyolefin molding materials, which are in prolonged contact with water. These mixtures show superior long term performance as measured by standard test methods such as color measurements.