Sandoz Gmbh

Evelyne Kalt

Lajos Avar

Hellmuth Reinshagen

Hans-Werner Finck

Oxalanilides of formula I ##STR1## in which R is C.sub.6-22 alkyl or C.sub.6-22 alkoxy

Aromatic oxamides useful as stabilizers

1,3-dihydroxy-4,6-bis-4'-(2',2',6',6',-tetramethylpiperidyl) benzene, its 1'-alkyl or 1'-(substituted alkyl) derivatives and monomeric or polymeric products derived from these compounds by substitution of 1- and 3-hydroxy groups and/or by the linking of hydroxy groups on adjacent units through a bridging groups, are useful as light and heat stabilizers for polymeric organic materials. Corresponding bis(3',4'-dehydro) unsaturated compounds are useful as intermediates.

Organic compounds

Concentrated solutions of aromatic oxamide stabilizers

The present invention relates to a photopolymerization process comprising irradiating a photopolymerizable material with U.V. light of wave length 250 to 400 nm in the presence of a photosensitizing amount of a photoinitiator of formula I, ##STR1## in which R is hydrogen or halogen

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Riedisheim, France

Evelyne Kalt