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US 4,102,870 AGranted
Modified polyurethanes with increased light stability
AssigneeCiba-Geigy Corporation
InventorsPeter Hofmann, Helmut Muller, Jean Rody
Life of this patent
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Abstract
The incorporation of sterically hindered piperidine derivatives into polyurethanes protects this polymer material against light degradation. Usable for the incorporation are piperidine derivatives which are at least difunctional towards isocyanates and contain the structure ##STR1## wherein R is hydrogen or alkyl having 1 to 5 carbon atoms.
Claims9
Polyurethanes which are stabilised against light degradation and contain in the polymer molecule the grouping ##STR13## in which R denotes hydrogen or alkyl with 1-5 C atoms.
Dependencies are inferred from the claim text.