Abstract: Epoxy resins stabilized by at least one sterically hindered cyclic amine of the formula I ##STR1## AND SALTS THEREOF IN WHICH Q IS 1 OR 2, X represents an organic grouping which complements the nitrogen-containing ring to give a 5-membered, 6-membered or 7-membered ring, R.sub.1 and R.sub.2 represent methyl or together represent --(CH.sub.2).sub.5 --, R.sub.3 represents methyl, R.sub.4 represents alkyl with 1-5 carbon atoms or together with R.sub.3 represents the radicals --(CH.sub.2).sub.4 --, --(CH.sub.2).sub.5 --, --CH.sub.2 --C(CH.sub.3).sub.2 --NH--C(CH.sub.3).sub.2 --CH.sub.2 -- or --CH.sub.2 --C(CH.sub.3).sub.2 --N(O.sup..)--C(CH.sub.3).sub.2 --CH.sub.2 -- and, if q is 1, Y denotes hydrogen, --O.sup.., hydroxyl, alkyl, substituted alkyl, alkenyl, alkynyl, aralkyl, substituted aralkyl or acyl or, if q is 2, Y denotes alkylene, alkenylene, alkynylene, cycloalkylene or aralkylene.

Abstract: New piperidine derivatives of 1,3-pyrimidine and 1,3,5-triazine are used as stabilizers for organic materials, especially for polymers.

Abstract: According to the present invention, there are provided compounds having the formula: ##SPC1##And salts thereof, wherein n is 1 or 2, X is O of NH, Y is O, hydrogen or a branched- or straight chain alkyl residue having from 1 to 4 carbons and R.sub.1 is a hydrocarbyl residue having from 1 to 20 carbon atoms, which are useful as stabilisers for polymers.

Abstract: Compounds having the formula ##SPC1##As well as salts thereof, wherein n is 1 or 2, Y is 0, hydrogen or a straight- or branched chain alkyl residue having from 1 to 4 carbon atoms Z is 0 or S and when n is 1, R.sub.1 is a substituted or unsubstituted hydrocarbyl residue having from 1 to 20 carbon atoms and when n is 2, R.sub.1 is a substituted or unsubstituted hydrocarbyl residue having from 2 to 20 carbon atoms, are suitable as stabilisers of organic material.