Stabilisierungsmittel fuer Celluloseester

Plastic compositions comprising a major proportion of cellulose organic acid esters are stabilized against the effects of heat, light, or weather, and rendered odourless by the addition of one or more carbodiimides. In general, aliphatic, cycloaliphatic or aromatic monocarbodiimides may be used, those of the formula: being preferred, where R represents like or different alkyl, alkoxy, or aryl radicals, especially phenyl and aralkyl and particularly phenalkyl radicals, R1 represents R or alternatively halogen or nitro-radicals, X is any desired inert radical and n is an integer from 0 to 3. Alkyl-substituted derivatives of diphenylcarbodiimide are preferred. Monocarbodiimides specified include N, N1-diisopropylcarbodiimide, N,N1-dibutylcarbodiimide, N, N1-diallylcarbodiimide, N, N1-dioctylcarbodiimide, N, N1-dicyclopentylcarbodiimide, N, N1-dicyclohexylcarbodiimide, N, N1-dicycloheptylcarbodiimide, N, N1-dicyclooctylcarbodiimide, N, N1-dibornylcarbodiimide, diphenylcarbodiimide, N, N1-di-p-tolyl-carbodiimide, dip-bromo-phenylcarbodiimide, di-p-carbethoxyphenylcarbodiimide, di-p-diethylaminophenylcarbodiimide, di-a -naphthylcarbodiimide,di-b -naphthylcarbodiimide, di-a -pyridylcarbodiimide, N-methyl-N1-tert.-butylcarbodiimide, N-hexyl-N1-isopropylcarbodiimide, N-(n-hexadecyl)-N1-(tert. butyl)-carbodiimide, N - n - dodecyl -N1 - (tert. butyl)-carbodiimide, N-allyl-N1-oleylcarbodiimide, N-allyl-N1-cyclo-hexyl-carbodiimide, N-tert.-butyl-N1-cyclohexylcarbodiimide, N-tert.-butyl-N1-furfurylcarbodiimide, N-propyl-N1-phenyl-carbodiimide, N-isopropyl-N1-3-chlorophenylcarbodiimide, N-phenyl-N1-benzylcarbodiimide, N-isopropyl-N1-naphthylcarbodiimide, N-phenyl-N1-p-tolyl-carbodiimide and N-phenyl-N1-tritylcarbodiimide. Diphenyl carbodiimide derivatives which are substituted on the aromatic radicals are also useful, especially for odour-removal, and may be made according to Specification 930,036 from aromatic monoisocyanates, which carry one or two aryl, alkyl, aralkyl or alkoxy-substituents in the o-position to the NCO-group, at least one of the substituents comprising at least two carbon atoms, under the action of e.g. tertiary amines, or basically reacting metal compounds. Examples cited are 2,21-diethyl-diphenyl carbodiimide, 2,21-diisopropyl-diphenyl carbodiimide, 2,21-diethoxydiphenyl carbodiimide, 2,21,6, 61-tetraethyl-diphenyl-carbodiimide, 2,21,6,61-tetraethyl-4, 41-dimethyl-diphenyl-carbodiimide, 2, 21, 6, 61-tetraisopropyl-diphenyl-carbod