Stabilized polyolefinic compositions and stabilizer compounds suitable to that purpose

Claim 2

Stabilized polyolefinic compositions, comprising a polyolefin and a stabilizing amount of at least one stabilizer organic compound, containing at least one 3,3,5,5-tetramethyl-morpholine or 2,3,3,5,5-pentamethyl-morpholine: wherein R is hydrogen or methyl; bearing a substituent on the carbon atom in the position 2 and/or on the nitrogen atom in the position 4 of the ring.

Claim 3

Composition according to claim 1, characterized in that said stabilizer organic compound is selected from the following classes of compounds: Class a) - compounds with general formula: wherein: R 1 is a group selected among: wherein: R 2 is a straight or branched alkylene radical containing from 1 to 4 carbon atoms (C 1 -C 4 ) ; R 3 is a straight or branched alkyl radical con taining from 1 to 20 carbon atoms (C 1 -C 20 ) ; Class b) - compounds with general formula: wherein: R is hydrogen or methyl; R 4 is a group selected among: wherein: R 5 is a straight or branched C 1 -C 10 alkylene group; the phenyl group; a phenyl group bearing ore or more C 1 -C 4 alkyl substituents; a cycloalkyl group; a cycloalkyl group bearing one or more C 1 -C 4 alkyl substituents; a (C 1 -C 4 )-dialk ylene group; a (C 1 -C 4 )-dialkylene-cycloalkyl group; R 6 is C 1 -C 4 alkylene group; Class c) - compounds with general formula: wherein: R 7 is a straight- or branched-chain C 1 -C 6 a-lifatic hydrocarbon residue; and n is an integer of value ranging from 1 to 4. Class d) - compounds deriving from the homopolymerization of: Class e) - compounds deriving from the reaction of: with symmetric trichlorotriazine and possib ly also with a diamine, such as piperazine, ethylene diamine and hexamethylenediamine.

Claim 4

Composition according to claims 1 and 2, charac terized in that the stabilizer compound is selected among: 3,3,5,5-tetramethyl-morpholino-2-methylene-thioglycolate stearyl ester; 3,3,5,5-tetramethyl-morpholino-2-methylene-diethyl-phos phonate; 3,3,5,5-tetramethyl-2-hydroxy-methyl-morpholine adipate and sebacate; products from the reaction of 2,3,3,5,5-pentamethyl-2-β'-hydroxyethoxymorpholine with tolylene diisocyanate, hexamethylene diisocyanate or adipoyl chloride; products from the reaction of 3,3,5,5-tetramethyl-2-methylene-morpholine with diethoxylated hydroquinone, 1,4-dimethylolcyclohexane or p-dimethylolbenzene; products from the reaction of 2,3,3,5,5-pentamethyl-2- ethoxy-( β-amino-N-methyl)-morpholine with tolylenediisocyanate or with hexamethylenediisocyanate; the reaction product of 3,3,5,5-tetramethyl-2-methylene- morpholine with N,N'-(di-β-hydroxyethyl)-piperazine ; products from the reaction of 3,3,5,5-tetramethyl-2-methylene-morpholine with hexanediols, pentanediols, neopentyl glycol, trimethylolethane and pentaerithritol; products from the homopolymerization of 3,3,5,5-tetramethyl-2-methylene-morpholine-N-[2-hydroxyethyl], with molecular weight of from 398 to about 12,000; products from the reaction of 2,3,3,5,5-pentamethyl-2- ethoxy-(β-amino-N-methyl)-morpholine with symmetric trichloro-triazine; polymers derived from the reaction between 2,3,3,5,5-pentamethyl-2-ethoxy-(β-amino-N-methyl)-morpholine, symmetric trichlorotriazine and a diamine of the type of piperazine, ethylenediamine, or hexamethylenediamine, with a molecular weight ranging from 400 to 12,000.

Claim 5

Composition according to claim 1, characterized in that the polyolefin is polypropylene or polyethylene.

Claim 6

Composition according to claim 1, characterized in that it contains such an amount of stabilizer compound, or of stabilizer compounds, as bringing a content of active nitrogen of from 0.003 to 0.03% by weight.

Claim 7

Composition according to claim 5 characterized in that the content of said active nitrogen is comprised within the range of from 0.005 to 0.02% by weight.

Claim 8

Composition according to claim 6, characterized in that said content of active nitrogen ranges from 0.010 to 0.015% by weight.

Claim 9

Composition according to claim 1, characterized in that it additionally contains one or more other additives selected among antioxidizers, UV-light absorbers, Ni-based stabilizers; pigments, fillers, plastifiers, antistatic agents, fire-proofing agents, lubricants and metal-deactivators.

Claim 10

Stabilizer compounds for polyolefins, according to claims 1, 2 and 3.