# US 4,395,508 A · Polycondensates of substituted piperidines and use thereof as stabilizers for polymers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,395,508 A - Document ID: US4395508A - Status: Granted - Kind: A - Application number: 06/287,908 - Filed: 1981-07-29 - Granted: 1983-07-26 - Earliest claimed: 1979-06-28 - Assignees: Montedison S.p.A. - Inventors: Giuseppe Nelli; Roberto Oriani - Web page: https://patentgrep.com/patent/US4395508A ## CPC - C08L 77/00: Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain (of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08); Compositions of derivatives of such polymers - C08G 69/02: Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids - C08G 69/26: derived from polyamines and polycarboxylic acids - C08K 5/3435: Piperidines - C08L 101/00: Compositions of unspecified macromolecular compounds - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) ## Abstract New polycondensates of alkyl-substituted piperidines are disclosed. These new polycondensates are useful for stabilizing thermoplastic polymers, in particular polyolefins, against sunlight, heat and oxidation. A process for producing the new polycondensates is also disclosed, as well as the polymeric compositions stabilized with said new polycondensates. ## Claims ### Claim 1 Polyamides having the general formula (II): ##STR9## wherein: each of R.sub.1, R.sub.2, R.sub.3 and R.sub.4, which may be the same or different, is an alkyl radical having 1 to 4 carbon atoms; R.sub.5 is hydrogen or an alkyl radical having 1 to 4 carbon atoms; R.sub.6 is hydrogen, an alkyl radical having 1 to 20 carbon atoms, a cycloalkyl radical having 3 to 10 carbon atoms, an aryl radical or an alkyl-aryl radical having from 6 to 20 carbon atoms; A is an alkylene radical having 3 to 10 carbon atoms or a cyclo-alkylene radical having 3 to 10 carbon atoms, and n is an integer from 2 to 100. ### Claim 2 (depends on 1) Polyamides according to claim 1, in which in the general formula (II), each of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is methyl, R.sub.5 is hydrogen, R.sub.6 is hydrogen, A is an alkylene radical having 3 to 6 carbon atoms and n is an integer from 2 to 20. ### Claim 3 (depends on 1) A composition comprising thermoplastic synthetic polymers, stabilized to oxidation, to heat and to sun light, said composition containing incorporated therein, in an amount sufficient to prevent any degradation of the polymer, a polyamide according to claim 1 and having general formula (II). ### Claim 4 (depends on 3) A composition according to claim 3, in which, in general formula (II), each of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is methyl, each of R.sub.5 and R.sub.6 is hydrogen, A is an alkylene radical containing 3 to 6 carbon atoms and n is an integer from 2 to 20. ### Claim 5 (depends on 3) A composition according to claim 3 in which the polyamide having general formula (II) is present in an amount ranging from 0.01 to 5% by weight referred to the polymer weight. ### Claim 6 (depends on 3) A composition according to claim 3, in which the thermoplastic synthetic polymer is a polyolefin. ### Claim 7 (depends on 6) A composition according to claim 6, in which the polyolefin is polypropylene consisting prevailingly of isotactic macromolecules. ### Claim 8 (depends on 6) A composition according to claim 6, in which the polyamide having general formula (II) is present in an amount ranging from 0.01 to 2% by weight on the weight of the polyolefin. ### Claim 9 (depends on 3) A composition according to claim 3, in which the thermoplastic synthetic polymer is polyvinyl chloride or polyvinylidene chloride. ### Claim 10 (depends on 9) A composition according to claim 9, in which the polyamide having general formula (II) is present in an amount ranging from 0.01 to 1% by weight referred to the polymer weight. ### Claim 11 (depends on 3) A composition according to claim 3, in which the thermoplastic synthetic polymer is a polyurethane or a polyamide. ### Claim 12 (depends on 11) A composition according to claim 11, in which the polyamide having general formula (II) is present in an amount ranging from 0.01 to 5% by weight referred to the polymer weight. ### Claim 13 (depends on 3) A composition according to claim 3, in which the polyamide having general formula (II) is present in admixture with other known polymer additives. ### Claim 14 (depends on 13) A composition according to claim 13, in which the polymer additives are selected from the group consisting of antioxidants, ultraviolet ray absorbers, pigments, fillers, basic nitrogen-containing polycondensates and other known stabilizers. ### Claim 15 (depends on 13) A composition according to claim 13, in which the ratio by weight of the other polymer additives to the polyamide having general formula (II) is from 0.5:1 to 3:1.