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US 6,787,591 B2Granted
Synergistic stabilizer compositions for themoplastic polymers in prolonged contact with water
AssigneeClariant Finance (BVI) Limited
InventorsHarald Koch, Christoph Kröhnke, Alexander Lichtblau, Matthias Zäh
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Abstract
The invention relates to synergistic stabilizer compositions comprising Hindered Amine Stabilizers (HAS), phenolic antioxidants, and, if appropriate, UV-absorbers, for 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 oxidation induction time (OIT).
Claims13
A stabilizer composition for thermoplastic polymers comprising:
- a) at least one sterically hindered amine, wherein the at least one sterically hindered amine is the polymer of epichlorhydrin and 2,2,4,4-tetramethyl-7-oxa-3,20-diaza-20-(2,3-epoxi-propyl)-dispiro-[5.1.11.2]-heneicosane-21-one (LS 1);
- and
- b) at least one phenolic antioxidant,
- wherein the overall weight ratio of component(s) a) to the overall weight ratio of component(s) b) is from 10:1 to 1:5.
1 more element
Dependencies are inferred from the claim text.