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US 2004/0171723 A1Published application
Phosphorus compounds as stabilizers
AssigneeClariant GmbH
InventorPeter Staniek
Life of this patent
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Abstract
The present invention relates to phosphorus compounds as stabilizers for polymers with respect to exposure to heat or mechanical stress during processing. In particular, even very small concentrations of from 25 to 350 ppm of bis(diphenylphosphino)-2,2-dimethylpropane are highly effective.
Claims6
Composition comprising as component a) one or more polymers selected from polyolefins, polystyrene, polyurethanes, polyester, polyamides and polyacetals, as well as copolymers and blends of these individual polymers,
- and as component b) one or more compounds selected from the compounds of the formula (II), (III) and (IV)
- 3
- at an amount from 10 to 400 ppm based on the polymer in the composition.
Dependencies are inferred from the claim text.