Sandoz Gmbh

Sandoz Ltd., (sandoz Ag)

Martin Preiswerk

Lajos Avar

Kurt Hofer

The present invention concerns certain novel compounds falling under the general formula: ##STR1## WHEREIN R.sub.1, R.sub.2 and R.sub.3 are substituents, e.g. alkyl and Me is hydrogen or a metal cation. The compounds are useful stabilizers of organic material against the degradative effect of heat, oxidation and U.V. light.

Pyrazole compounds as stabilizers for organic materials

New ultraviolet light-absorbing compounds of the formula ##STR1## IN WHICH R.sub.1 is a substituent, e.g. alkyl,

Pyrazole derivatives

The present invention concerns a novel method of stabilizing organic material susceptible to degradation under the effect of heat, oxidation or ultra-violet light which comprises treating said material with a compound of the formula: ##STR1## WHEREIN R.sub.1, R.sub.2 and R.sub.3 are substituents, e.g. alkyl and Me is hydrogen or a metal cation.

Method of stabilizing organic materials employing pyrazole compounds and

New ultraviolet light-absorbing compounds of the formula ##SPC1## In which

The present invention concerns benzophenone compounds of the formula: ##SPC1## Wherein

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Basel, Switzerland

Martin Preiswerk