# US 8,772,394 B2 · Heat stabilized moulding composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,772,394 B2 - Document ID: US8772394B2 - Status: Granted - Kind: B2 - Application number: 11/795,140 - Filed: 2006-01-12 - Published: 2008-06-19 - Granted: 2014-07-08 - Earliest claimed: 2005-01-17 - Assignees: Dsm IP Assets B.V. - Applicants: Pieter Gijsman; Wilhelmus J. M. Sour; Rudy Rulkens; Robert H. C. Janssen - Inventors: Pieter Gijsman; Wilhelmus J. M. Sour; Rudy Rulkens; Robert H. C. Janssen - Web page: https://patentgrep.com/patent/US8772394B2 ## 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 - C08K 3/014: Stabilisers against oxidation, heat, light or ozone - C08K 3/22: of metals - C08K 5/005: {Stabilisers against oxidation, heat, light, ozone} - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) ## Abstract The invention relates to a thermostabilized thermoplastic molding composition comprising (a) a thermoplastic polyamide composition, consisting of a blend of at least two polyamides comprising (a.1) at least 50% mass, relative to the total mass of the thermoplastic polyamide composition, of a first polyamide (PA-1), being a semi-crystalline polyamide having a melting point Tm-1, or being an amorphous polyamide having a glass transition point Tg-1, wherein Tm-1 and Tg-1 together are denoted as T-1 and T-1 is at least 200° C. and (a.2) a second polyamide (PA-2), with a C/N ratio of at most 7, being a semi-crystalline polyamide having a melting point Tm-2 or an amorphous polyamide having a glass transition point Tg-2, wherein Tm-2 and Tg-2 together are denoted as T-2 and T-2 is at least 20° C. lower than T-1, (b) a stabilizing system comprising a thermostabilizer selected from the group consisting of phenolic thermostabilizers, organic phosphites, aromatic amines, metal salts of elements from Group IB, MB, III and IV of the Periodic Table and metal halides of alkali and alkali earth metals, and combinations thereof, and (c) a metal oxide, or salt thereof, of a transition metal element from Group VB, VIIB, VIIB and VIIIB of the Periodic Table, or a mixture thereof. ## Claims ### Claim 1 A thermostabilized thermoplastic moulding composition comprising: a) a thermoplastic polyamide composition which consists of a blend of at least two polyamides comprising: a1) at least 50 mass %, relative to the total mass of the thermoplastic polyamide composition, of a first polyamide (PA-1), being a semi-crystalline polyamide having a melting point Tm-1, or being an amorphous polyamide having a glass transition point Tg-1, wherein each of the melting point Tm-1 and the glass transition point Tg-1 is denoted as a temperature T-1 which is at least 200° C., and a2) an amount of 1-50 mass %, relative to the total mass of the thermoplastic polyamide composition, of a second polyamide (PA-2), with a C/N ratio of at most 7, being a semi-crystalline polyamide having a melting point Tm-2 or an amorphous polyamide having a glass transition point Tg-2, wherein each of the melting point Tm-2 and the glass transition point Tg-2 is denoted as a temperature T-2 which T-2 is at least 20° C. lower than the temperature T-1, b) a stabilizing system comprising a thermostabilizer which is at least one selected from the group consisting of phenolic thermostabilizers, organic phosphites, aromatic amines, metal salts of elements from Group IB, IIB, III or IV of the Periodic Table, metal halides of alkali or alkali earth metals, and combinations thereof, and c) 0.01-10 mass %, relative to the total mass of the thermoplastic polyamide composition, of iron oxide, wherein the moulding composition exhibits reduced deterioration when exposed to an elevated temperature of 230° C. for a prolonged time period of 1000 hours as compared to an identical moulding composition including a CuI/KI stabilization system but not including the iron oxide. ### Claim 2 (depends on 1) The composition according to claim 1, wherein the iron oxide comprises particles with a particle size of less than 1 mm. ### Claim 3 (depends on 2) The composition according to claim 2, wherein the particle size of the particles of the iron oxide is less than 0.1 mm. ### Claim 4 (depends on 3) The composition according to claim 3, wherein the particle size of the particles of the iron oxide is less than 0.01 mm. ### Claim 5 (depends on 1) The composition according to claim 1, wherein the iron oxide is present in an amount of 0.1-4 mass %, relative to the total mass of the thermoplastic polyamide composition. ### Claim 6 (depends on 1) The composition according to claim 1, wherein the stabilizing system (b) comprises a copper salt. ### Claim 7 (depends on 1) The composition according to claim 1, wherein the first polyamide is PA-6,6, PA-4,6 or a semi-aromatic polyamide. ### Claim 8 (depends on 1) The composition according to claim 1, wherein the second polyamide is PA-6 or a copolyamide thereof. ### Claim 9 (depends on 1) The composition according to claim 1, wherein T-1 is at least 220° C. and T-2 is at least 30° C. lower than T-1. ### Claim 10 (depends on 1) The composition according to claim 1, wherein the second polyamide is present in an amount of 2.5-40 mass %. ### Claim 11 (depends on 1) A moulded part for high-temperature applications involving a use temperature of at least 150° C., which comprises a composition according to claim 1. ### Claim 12 (depends on 1) A moulded part consisting of a composition according to claim 1. ### Claim 13 (depends on 12) An automotive engine, a machine, or an electrical or electronic installation which comprises a moulded part according to claim 12. ### Claim 14 (depends on 1) A process for preparing a moulded part comprising feeding a composition according to claim 1, and optionally further ingredients, to a moulding machine.