Hydroxybenzylmalonic acid derivatives and their use as...

C - Chemistry – Metallurgy – 07 – D

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400/7087, 260/27

C07D 211/36 (2006.01) C07D 211/46 (2006.01) C07D 211/58 (2006.01) C07D 211/94 (2006.01) C07F 9/40 (2006.01) C07F 9/58 (2006.01) C07F 9/59 (2006.01) C08K 5/00 (2006.01) C08K 5/3435 (2006.01)

Patent

CA 1077940

Abstract of the Disclosure Esters and amides from 4-hydroxy-and 4-amino-polyalkyl- piperidines and hydroxybenzylmalonic acids substituted at the central carbon atom with an organic residue, preferably alkyl-, esteralkyl- or phosphonoalkyl-groups, are excellent stabilisers for organic polymers, especially for polyolefins. They protect the polymers, as well against light degradation as against thermo-oxidative degradation. The compounds can be prepared by hydroxybenzylation of the corresponding derivatives of substituted malonic acids. Bis-malonic acid derivatives may be obtained from the mono- malonics by reaction with formaldehyde.

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