Patent number: 4132702
Abstract: Compounds of the formula I ##STR1## in which R.sub.1 and R.sub.2 independently of one another denote alkyl, cycloalkyl or aralkyl, R.sub.3 denotes hydrogen or, conjointly with R.sub.1, denotes tetramethylene, R.sub.4 denotes hydrogen or lower alkyl or, conjointly with R.sub.2, denotes tetramethylene, R.sub.5 denotes hydrogen, alkyl, aralkyl, acyloxyalkyl, oxaalkyl or phenyl, R.sub.6 denotes hydrogen, alkhyl, phenyl or the group or, conjointly with R.sub.5, denotes alkylene, R.sub.7 denotes hydrogen, alkyl, phenyl, benzyl or alkylphenyl or, conjointly with R.sub.5 or R.sub.6, denotes alkylene or, conjointly with R.sub.5 and R.sub.6, denotes alkanetriyl, R.sub.5, R.sub.6 and R.sub.7 together containing at least one carbon atom, Y denotes --O-- or --NH--, P denotes 1, 2, 3 or 4 and A denotes hydrogen or a group which is derived from an organic or inorganic oxygen acid A-(OH).sub.p, are suitable for stabilizing organic material against thermo-oxidative degradation.
Type:
Grant
Filed:
July 27, 1976
Date of Patent:
January 2, 1979
Assignee:
Ciba-Geigy Corporation
Inventors:
Andreas Schmidt, Kurt Schwarzenbach