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Polymer stabilizers - some recent developments

SpecialChem / Dec 21, 2000

Improvements in preventing the oxidation of plastics by UV light, or by heat in processing or in use, have continued to increase the performance of plastic products. Plastics Additives & Compounding looks at some new approaches in polymer stabilization. The growth in the use of polyolefins would not have been possible without the progress made with hindered amine light stabilizers (HALS). Matching a HALS structure to the overall system is critical, explains the company. For example, consider the requirements of a PP thick section part designed for an automotive exterior application. Retention of colour and surface appearance will be critical, as well as retention of physical properties. Work was undertaken to compare the performance of HALS-2 (CYASORB® UV-3853 light stabilizer) with HALS-1, a product similar in molecular weight and functionality that might be expected to perform similarly. PP homopolymer was compounded with a base stabilization package and either HALS-1 or HALS-2 at three different loadings - 0.15%, 0.30% and 0.45% - and the pellets were made into plaques by injection moulding.

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