優れた色彩及び熱安定性並びに耐酸化性を有するパイプ用のポリオレフィン組成物

摘要

The present invention relates to a polyolefin composition with increased resistance to discoloration and to oxidation as well as superior thermal stability and to a pipe or a fitting made of such a polyolefin composition. The composition comprises a polyolefin base resin (A), an antioxidant (B) having a chroman-6-ol structure, an antioxidant (C) having a phenolic structure and an antioxidant (D) having a diphosphite structure. The present invention further relates to the use of the polyolefin composition for the production of a pipe or a fitting and to the use of the polyolefin composition for increasing the lifetime of a pipe or fitting providing the polyolefin composition with resistance against degradation caused by oxidation and with thermal stability.