# US 10,479,888 B2 · Polybutylene terephthalate composition with improved hydrolytic stability > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,479,888 B2 - Document ID: US10479888B2 - Status: Granted - Kind: B2 - Application number: 15/736,814 - Filed: 2016-06-03 - Published: 2018-06-14 - Granted: 2019-11-19 - Earliest claimed: 2015-06-18 - Assignees: Sabic Global Technologies B.V. - Applicants: SABIC Global Technologies B.V. - Inventors: Husnu Alp Alidedeoglu; Yuzhen Yang; Prashant Kumar - Web page: https://patentgrep.com/patent/US10479888B2 ## CPC - C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) - C08G 63/183: Terephthalic acids - C08G 63/83: Alkali metals, alkaline earth metals, beryllium, magnesium, copper, silver, gold, zinc, cadmium, mercury, manganese, or compounds thereof {(C08G63/823 takes precedence)} - C08G 63/916: {Dicarboxylic acids and dihydroxy compounds} - C08K 7/14: Glass - 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 - C08L 2205/03: containing three or more polymers in a blend - 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 The present invention relates to a thermoplastic composition with improved hydrolytic stability, comprising: 30 to 50 percent by weight of a polybutylene terephthalate (PBT) having a carboxylic end group concentration (CEG) of 40 to 120 mmol/kg and an intrinsic viscosity of 0.63 to 0.68 dl/g as measured in a 60:40 phenol/tetrachloroethane; 0.01 to 0.1 percent by weight of a catalyst; 0.01 to 5 percent by weight of an epoxy chain extender; wherein all weight percents are based on the total weight of the composition. ## Claims ### Claim 1 A thermoplastic composition with improved hydrolytic stability, comprising: 10 to 30 percent by weight of polybutylene terephthalate (PBT) having a carboxylic end group concentration (CEG) of 40 to 50 mmol/kg, and an intrinsic viscosity of 1.15 to 1.25 dl/g as measured in a 60:40 phenol/tetrachloroethane; 30 to 50 percent by weight of a polybutylene terephthalate (PBT) having a carboxylic end group concentration (CEG) of 50 to 120 mmol/kg and an intrinsic viscosity of 0.63 to 0.68 dl/g as measured in a 60:40 phenol/tetrachloroethane; 25 to 35 weight percent of a reinforcing filler; 0.01 to 0.1 percent by weight of a catalyst; 0.01 to 5 percent by weight of an epoxy chain extender; 0.01 to 0.1 percent by weight of a hindered phenol stabilizer; and 0.1 to 10 percent by weight of a mold release agent; wherein all weight percents are based on the total weight of the composition; and wherein the melt volume flow rate as measured by ISO 1133 at 250° C. with 5 kg load and 300 s dwell time of the thermoplastic composition when subjected to 80° C. and 70 percent room humidity after 500 hours is between 52 and 62 cm3/10 min, and the melt volume flow rate percent change compared to an initial melt volume flow rate of the thermoplastic composition is between 20 and 40 percent. ### Claim 2 (depends on 1) The thermoplastic composition of claim 1, wherein the polybutylene terephthalate (PBT) having an intrinsic viscosity of 0.63 to 0.68 dl/g as measured in a 60:40 phenol/tetrachloroethane has a CEG of 50 to 80 mmol/kg. ### Claim 3 (depends on 1) The thermoplastic composition of claim 1, wherein the reinforcing filler is glass fiber. ### Claim 4 (depends on 3) The thermoplastic composition of claim 3, comprising 28 to 32 percent by weight of glass fiber. ### Claim 5 (depends on 1) The thermoplastic composition of claim 1, wherein the chain extender is 3,4-epoxycyclohexylmethyl-3′,4′-epoxycyclohexane carboxylate. ### Claim 6 (depends on 5) The thermoplastic composition of claim 5, comprising 1.5 to 3 percent by weight of 3,4-epoxycyclohexylmethyl-3′,4′-epoxycyclohexane carboxylate. ### Claim 7 (depends on 1) The thermoplastic composition of claim 1, wherein the catalyst is sodium stearate. ### Claim 8 A thermoplastic composition with improved hydrolytic stability, comprising: 10 to 30 percent by weight of polybutylene terephthalate (PBT) having a carboxylic end group concentration (CEG) of 40 to 50 mmol/kg, and an intrinsic viscosity of 1.2 cm3/g as measured in a 60:40 phenol/tetrachloroethane; 30 to 50 percent by weight of a polybutylene terephthalate (PBT) having a carboxylic end group concentration (CEG) of 40 to 120 mmol/kg and an intrinsic viscosity of 0.63 to 0.68 dL/g as measured in a 60:40 phenol/tetrachloroethane; 25 to 35 percent by weight of a reinforcing filler; 0.01 to 3 percent by weight of an epoxy chain extender; 0.01 to 0.1 percent by weight of a hindered phenol stabilizer; 0.01 to 0.1 percent by weight of a catalyst; and 0.1 to 10 percent by weight of a mold release agent; wherein all weight percents are based on the total weight of the composition; and wherein the melt volume flow rate as measured by ISO 1133 at 250° C. with 5 kg load and 300 s dwell time of the thermoplastic composition when subjected to 80° C. and 70 percent room humidity after 500 hours is between 52 and 62 cm3/10 min, and the melt volume flow rate percent change compared to an initial melt volume flow rate of the thermoplastic composition is between 20 and 40 percent. ### Claim 9 (depends on 1) The thermoplastic composition of claim 1, comprising: 10 to 30 percent by weight of polybutylene terephthalate (PBT) having an intrinsic viscosity of 1.2 cm3/g as measured in a 60:40 phenol/tetrachloroethane 30 to 50 percent by weight of the polybutylene terephthalate (PBT) having a carboxylic end group concentration (CEG) of 50 to 120 mmol/kg and an intrinsic viscosity of 0.63 to 0.68 dL/g as measured in a 60:40 phenol/tetrachloroethane; 25 to 35 percent by weight of glass fiber; 1.5 to 3 percent by weight of 3,4-epoxycyclohexylmethyl-3′,4′-epoxycyclohexane carboxylate; 0.01 to 0.06 percent by weight of pentaerythritol-tetrakis(3-(3,5-di-tert.butyl-4-hydroxy-phenyl)-propionate; 0.01 to 1 percent by weight of sodium stearate; and 0.1 to 10 percent by weight of linear low density polyethylene; wherein the melt volume flow rate as measured by ISO 1133 at 250° C. with 5 kg load and 300 s dwell time of the thermoplastic composition when subjected to 80° C. and 70 percent room humidity after 500 hours is between 52 and 62 cm3/10 min, and the melt volume flow rate percent change compared to an initial melt volume flow rate of the thermoplastic composition is between 20 and 40 percent. ### Claim 10 (depends on 1) The thermoplastic composition of claim 1, comprising: 15 to 25 percent by weight of polybutylene terephthalate (PBT) having an intrinsic viscosity of 1.2 cm3/g as measured in a 60:40 phenol/tetrachloroethane 40 to 50 percent by weight of the polybutylene terephthalate (PBT) having a carboxylic end group concentration (CEG) of 50 to 120 mmol/kg and an intrinsic viscosity of 0.63 to 0.68 dL/g as measured in a 60:40 phenol/tetrachloroethane; 28 to 32 percent by weight of glass fiber; 0.01 to 0.05 percent by weight of pentaerythritol-tetrakis(3-(3,5-di-tert.butyl-4-hydroxy-phenyl)-propionate; 0.01 to 0.06 percent by weight of sodium stearate; 1.5 to 2 percent by weight of 3,4-epoxycyclohexylmethyl-3′,4′-epoxycyclohexane carboxylate; and 1 to 8 percent by weight of linear low density polyethylene; wherein the melt volume flow rate as measured by ISO 1133 at 250° C. with 5 kg load and 300 s dwell time of the thermoplastic composition when subjected to 80° C. and 70 percent room humidity after 500 hours is between 52 and 62 cm3/10 min, and the melt volume flow rate percent change compared to an initial melt volume flow rate of the thermoplastic composition is between 20 and 40 percent.