Abstract: A process for preparing 2,2,6,6-tetramethyl-4-piperidone from ammonia and acetone, wherein acetone and ammonia are reacted in a single stage for a time of 2 to 8 hours in an acetone:ammonia molar ratio of 20:1 to 4:1, at a temperature of 50.degree. to 120.degree. C. and at a pressure of 1 to 50 atmospheres, in the presence of 0.001-0.1 moles of acid catalysts per mole of acetone used in the reaction.

Abstract: Compounds of the formula ##STR1## in which R.sub.1 is hydrogen, --O, --CN, a linear or branched alkyl radical containing from 1 to 20 carbon atoms, an alkenyl or alkynyl radical containing from 2 to 20 carbon atoms, benzyl which is unsubstituted or substituted by 1 to 3 C.sub.1 -C.sub.4 -alkyl radicals or hydroxybenzyl which is unsubstituted or substituted by 1 to 3 C.sub.1 -C.sub.4 -alkyl radicals; or R.sub.1 is a --COR.sub.14, --COOR.sub.14, --CH.sub.2 COOR.sub.14 or --CONR.sub.14 R.sub.15 radical, in which R.sub.14 and R.sub.15, which may be identical or different, are linear or branched C.sub.1 -C.sub.20 -alkyl, C.sub.2 -C.sub.20 -alkenyl, C.sub.5 -C.sub.12 -cycloalkyl, phenyl which is unsubstituted or substituted by 1 to 3 C.sub.1 -C.sub.8 -alkyl radicals, hydroxyphenyl which is unsubstituted or substituted by 1 to 3 C.sub.1 -C.sub.4 -alkyl radicals, C.sub.7 -C.sub.

Abstract: New piperidine compounds of the formula ##STR1## in which the radicals have the meanings indicated in the specification and which are stabilizers against light, heat and oxidation for synthetic polymers.

Abstract: Novel piperidyl triazine derivatives are produced by reacting a substituted halogentriazine with a polyalcohol, a polymercaptan or a polyamine. The compounds are valuable light stabilizers for synthetic polymers, such as polyolefins, and fast to extraction in aqueous surfactant solutions.

Abstract: New compounds are disclosed comprised in the formula ##STR1## where R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.9, R.sub.10, R.sub.11, R.sub.12 are as defined in the specification and which have been found highly useful as stabilizers for polymers.Also the process for the preparation of the above new compounds is described.

Abstract: Novel piperidyl triazine derivatives are produced by reacting a substituted halogentriazine with a polyalcohol, a polymercaptan or a polyamine. The compounds are valuable light stabilizers for synthetic polymers, such as polyolefins, and fast to extraction in aqueous surfactant solutions.

Abstract: A composition is described for stabilizing polypropylene homopolymers against the deteriorating effects of light, particularly ultraviolet light, comprising a mixture of (I) benzophenones with (II) metal complexes of related compounds.

Abstract: Novel polyurea compounds having the general formula ##STR1## where R.sub.1 is hydrogen, alkyl, cycloalkyl, aryl, substituted aryl, aralkyl, or a piperidine radical of the formula ##STR2## where R.sub.5, R.sub.6, R.sub.8 and R.sub.9 are alkyl and R.sub.7 is hydrogen, oxygen, alkyl, alkenyl, alkinyl or aralkyl, R.sub.2 is alkylene, cycloalkylene, arylene or aralkylene, R.sub.3 is a piperidine radical as set forth above, R.sub.4 is alkylene, cycloalkylene, arylene or aralkylene, X is zero or one, y is an integer from 2 to 200 and A and B each represent a terminal group. In some of the y units and in B the ##STR3## can be replaced in part by ##STR4## where R.sub.10 R.sub.11 and R.sub.12 are hydrogen, alkyl, cycloalkyl, aryl, aralkyl or R.sub.10 and R.sub.11, are linked together so that ##STR5## forms a 6 to 8 member heterocyclic ringAre produced by reacting a diamine with carbonyl chloride or a diisocyanate.

Abstract: Novel tetraalkyl piperidine radical containing polytriazine compounds are produced by reacting a dihalogen-triazine with a bifunctional compound containing amine, alcohol, mercaptan or phenol groups at least one of the bifunctional compounds containing a tetraalkyl piperidine radical. The compounds are valuable light stabilizers for synthetic polymers, particularly polyolefin in the form of fibers or films.