# US 9,751,996 B2 · Polyamide resin composition with high heat resistance and oxidation resistance > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,751,996 B2 - Document ID: US9751996B2 - Status: Granted - Kind: B2 - Application number: 15/190,934 - Filed: 2016-06-23 - Published: 2017-06-22 - Granted: 2017-09-05 - Earliest claimed: 2015-12-21 - Assignees: Hyundai Motor Company - Applicants: Hyundai Motor Company - Inventors: Kyoung Chun Kweon - Web page: https://patentgrep.com/patent/US9751996B2 ## CPC - C08J 5/10: characterised by the additives used in the polymer mixture - C08G 69/265: {from at least two different diamines or at least two different dicarboxylic acids} - C08J 5/043: {with glass fibres} - C08K 5/092: Polycarboxylic acids - C08K 5/175: {containing COOH-groups; Esters or salts thereof} - C08L 77/06: Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence) - C08J 2377/06: Polyamides derived from polyamines and polycarboxylic acids (C08J2377/10 takes precedence) - C08J 2477/06: Polyamides derived from polyamines and polycarboxylic acids (C08J2477/10 takes precedence) - C08L 2201/08: Stabilised against heat, light or radiation or oxydation - C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure - Y02E 60/10: Energy storage using batteries - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - 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) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract The present invention relates to a polyamide resin composition having substantially improved heat resistance and oxidation resistance. The polyamide resin composition comprises a polyamide copolymer having high heat resistance and high rigidity, glass fiber, citric acid and ethylenediaminetetraacetic acid (EDTA) which can rapidly cause surface oxidation with glass fiber, such that a highly dense oxide film can be formed on a polymer surface at high temperatures for a long time. Accordingly, the polyamide resin composition of the present invention can prevent oxidation and thermal decomposition by exterior oxygen and heat, and have substantially improved physical properties such as impact strength, tensile strength, flexural strength and elongation. ## Claims ### Claim 1 A polyamide resin composition, comprising: an amount of about 56 to 69% by weight of a polyamide copolymer represented by the following Formula 1; an amount of about 30 to 40% by weight of a glass fiber; an amount of about 0.5 to 2% by weight of citric acid; and an amount of about 0.5 to 2% by weight of ethylenediaminetetraacetic acid (EDTA), all the % by weights are based on the total weight of the polyamide resin composition, wherein n and m are same or different positive integers, wherein the PA6T is hexamethylene terephthalamide, and wherein the PA66 is hexamethylene adipamide. ### Claim 2 (depends on 1) The polyamide resin composition of claim 1, wherein the polyamide copolymer comprises the PA6T (hexamethylene terephthalamide) and the PA66 (hexamethylene adipamide) mixed in a weight ratio of about 6:4 to about 5:5. ### Claim 3 (depends on 1) The polyamide resin composition of claim 1, wherein the glass fiber has a diameter of about 10 to 13 μm and a length of about 250 to 500 μm. ### Claim 4 (depends on 1) The polyamide resin composition of claim 1, wherein the polyamide resin composition forms an oxide film at a temperature of about 150 to 220° C. after 1,000 to 1,200 hours. ### Claim 5 (depends on 4) The polyamide resin composition of claim 4, wherein the oxide film has a thickness of about 45 to 55 μm. ### Claim 6 (depends on 1) The polyamide resin composition of claim 1, consisting essentially of: an amount of about 56 to 69% by weight of the polyamide copolymer; an amount of about 30 to 40% by weight of the glass fiber; an amount of about 0.5 to 2% by weight of citric acid; and an amount of about 0.5 to 2% by weight of ethylenediaminetetraacetic acid (EDTA), all the % by weights are based on the total weight of the polyamide resin composition. ### Claim 7 (depends on 1) The polyamide resin composition of claim 1, consisting of: an amount of about 56 to 69% by weight of the polyamide copolymer; an amount of about 30 to 40% by weight of the glass fiber; an amount of about 0.5 to 2% by weight of citric acid; and an amount of about 0.5 to 2% by weight of ethylenediaminetetraacetic acid (EDTA), all the % by weights are based on the total weight of the polyamide resin composition. ### Claim 8 (depends on 1) An article comprising a polyamide resin composition of claim 1. ### Claim 9 (depends on 1) A vehicle part comprising a polyamide resin of claim 1. ### Claim 10 (depends on 9) The vehicle part of claim 9 is a battery fuse terminal of a vehicle.