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US 2023/0357552 A1Published application
Polymer composition that is resistant to oxidative decomposition and article made therefrom
AssigneeW. R. Grace & Co.-Conn.
InventorZhiru MA
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Abstract
Polymer compositions are disclosed that can be used to produce different types of molded articles, such as extruded piping structures. The polymer composition contains an oxidative stabilizing package. The oxidative stabilizing package contains at least one antioxidant, a nucleating agent, and an acid scavenger. The nucleating agent is a phosphate ester or a dicarboxylate metal salt. The stabilizing package of the present disclosure dramatically improves oxidation induction time.
Claims25
A polymer composition well suited to forming piping structures, the polymer composition comprising:
- a thermoplastic polymer combined with an oxidative stabilizer package, the oxidative stabilizer package comprising;
- at least one sterically hindered phenolic antioxidant;
- a phosphite antioxidant;
- an acid scavenger;
- and
- a nucleating agent, the nucleating agent comprising a phosphate ester, a dicarboxylate metal salt, or mixtures thereof;
- and
- wherein the polymer composition displays an oxidation induction time when tested according to ISO Test 11357-6 (2018) at 210° C. of greater than 40 minutes.
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Dependencies are inferred from the claim text.