Oxalic acid derivatives

Abstract

Abstract Ultraviolet light absorbers for plastics (for example polyolefins, e.g. polyethylene or polypropylene; polyvinylchloride; or a nitro lacquer), which may be incorporated with or without one or more other known ultraviolet light stabilizers into the plastics, have the formula I in which each of R1, R2, R3, R4, R5, R6, R7 and R8 represents H, Cl, Br, -CnH2n 1, -CnH2n 1 or -O-CnH2n 1 or an -O-aryl, aryl, aralkyl or alkaryl radical with up to eight carbon atoms, M REPRESENTS A WHOLE NUMBER FROM 1 TO 8 INCLUSIVE, AND N REPRESENTS A WHOLE NUMBER FROM 1 TO 4 INCLUSIVE, WITH THE PROVISO THAT THE RADICALS R1, R2, R3, R4, R5, R6, R7 and R8, within their definition, may be similar or dissimilar and n need not necessarily have the same value in all of the radicals where n occurs, AND THE FORMULA Ia WHEREIN EACH OF R1'' to R10'', independently of one another, is selected from H, alkyl, aralkyl, alkaryl, alkyl-(OC2H4)n , alkyl-(OC3H6)n , Cl, Br, OH, O-alkyl, O-aryl, S-alkyl, S-aryl, COO-alkyl, COO-aryl, CONH-alkyl, CONH-aryl, NHCO-alkyl, NHCOaryl, alkyl ether radicals and alkyl thioether radicals, with the proviso that at least one of the radicals R''1 to R''10 must be such that at least one -C-S-C- grouping is present in the compound, and N'' REPRESENTS A WHOLE NUMBER OF FROM 1 TO 12 INCLUSIVE.

Inventors

• 👤 Kurt Hofer
• 👤 Rudolf Moesch
• 👤 Alfred Schilli
• 👤 Evelyne Burdet

Bibliographic Details