The performance of high molecular weight phenolic antioxidants in polypropylene and low-density
polyethylene in the presence of synergists - (in English)
The improvement in the antioxidant performance of primary antioxidants by the use of synergistic materials is well known. Traditional synergists include thioesters such as dilauryl and distearyl thiodipropionate or phosphites such as trino- nylphenyl phosphite. Some novel phosphites and thioesters have been introduced and their performance explored in low-density polyethylene and polypropylene, particularly with reference to ,,Topanol" CA produced by the Atlas Division of ICI Speciality Chemicals Group. „Topanol" CA is a trisphenolic antioxidant and the paper describes its performance with a wide range of thioester and phosphite synergists in conventional and gas-phase PP as well as LLDPE. The author also demonstrates that an improved performance can be obtained by using some of the new thioesters and phosphites which are now available, instead of the commonly-employed DSTDP.
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