Heat resistant molded or extruded thermoplastic articles

a thermoplastic article and heat aging technology, applied in fireproof paints, transportation and packaging, coatings, etc., can solve the problems of insufficient heat aging characteristics, poor long-term heat aging resistance improvement, and general decrease in mechanical properties

a thermoplastic article and heat aging technology, applied in fireproof paints, transportation and packaging, coatings, etc., can solve the problems of insufficient heat aging characteristics, poor long-term heat aging resistance improvement, and general decrease in mechanical properties

US20100029819A1Inactive Publication Date: 2010-02-04EI DU PONT DE NEMOURS & CO
14 Cites 107 Cited by

Examples

Experimental program
Comparison scheme
Effect test

examples

Materials

[0109]In the Examples and Comparative Examples:

[0110]PA66 refers to an aliphatic polyamide made of 1,6-hexanedioic acid and 1,6-hexamethylenediamine having an relative viscosity in the range of 46-51 and a melting point of about 263° C., commercially available from E.I. DuPont de Nemours and Company, Wilmington, Del., USA under the trademark Zytel® 101NC010.

[0111]PA6-1 refers to Durethan B29 poly(ε-caprolactam) available from Lanxess Germany.

[0112]PA6-2 refers to Ultramid® B27 poly(ε-caprolactam) available from BASF, USA.

[0113]PA6T / DT refers HTN501 NC010, a copolyamide of terephthalic acid, hexamethylenediamine, and 2-methyl-pentamethylenediamine having an inherent viscosity (IV), according to ASTM D2857 method, in the range of 0.8 to 0.95 (typically 0.88) and a melting point of about 300° C., and available from E.l. DuPont de Nemours and Company, Wilmington, Del., USA.

[0114]PA 6T / 66 refers HTN502 NC010, a copolyamide made from terephthalic acid, adipic acid, and hexamethyl...

example 1 and 2 and c-1

[0153]Compositions of Examples 1, 2 and Comparative Example C-1 are listed in Table 1 for PA66 compositions. Tensile properties after AOA at 210° C. at 500 h and 1000 h, and non-heat-aged control are listed in Table 2. Table 3 lists the retention of physical properties of the AOA samples as compared with the non-aged controls. Higher values of mechanical tensile properties (E-modulus, tensile strength, stress at yield) mean better mechanical properties.

TABLE 1Example No.FormulationC-112PA6669.768.266.7Glass fiber A30.030.030.0Cu Heat stabilizer0.30.30.3DPE—1.53.0

TABLE 2Example No.C-112Tensile modulus at 23° C. (MPa)non-heat-aged9731988110200heat aging at 210° C. for 500 hours95431004710322heat aging at 210° C. for 1000 hours9360978610002Tensile Strength at break at 23° C. (MPa)non-heat-aged206214213heat aging at 210° C. for 500 hours161191211heat aging at 210° C. for 1000 hours121165202Elongation at break at 23° C. (MPa)DAM3.53.63.1heat aging at 210° C. for 500 hours2.02.52.9heat ag...

examples 6-9

[0157]PA66 compositions of Examples 6-10 with a variety of polyhydric alcohols and Comparative Example C-3 are listed in Table 5. Tensile properties after AOA at 210° C. at 500 h and 1000 h, and tensile properties of non-heat-aged control; and retention of physical properties; are listed in Table 5. All the examples showed greater than 80% retention of tensile strength, after 500 hours AOA at 210° C. These results are comparable to or better than the conventional copper stabilizer (C-3).

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Abstract

Disclosed is a molded or extruded thermoplastic article having high heat stability over at least 500 hours at least 170° C. including a thermoplastic composition including a thermoplastic resin; one or more polyhydric alcohols having more than two hydroxyl groups and a having a number average molecular weight (Mn) of less than 2000; one or more reinforcement agents; and optionally, a polymeric toughener; wherein 4 mm test bars prepared from said thermoplastic composition, and exposed at a test temperature at 170° C. for a test period of 500 hours, have, on average, a retention of tensile strength of at least 50 percent, as compared with that of an unexposed control of identical composition and shape. Further disclosed is a molded or extruded thermoplastic article, including a thermoplastic polyamide composition, wherein 4 mm test bars of said thermoplastic polyamide composition, when exposed at 210° C. for a test period of 500 hours, have a retention of tensile strength of at least 70 percent.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of priority of U.S. Provisional Application No. 61 / 137,345, filed on 30 Jul. 2008 and currently pending.FIELD OF THE INVENTION[0002]The present invention relates to the field of molded and extruded thermoplastic articles having improved long-term high temperature aging characteristics.BACKGROUND OF THE INVENTION[0003]High temperature resins based on polyamides and polyesters possess desirable chemical resistance, processability and heat resistance. This makes them particularly well suited for demanding high performance automotive and electrical / electronics applications. There is a current and general desire in the automotive field to have high temperature resistant structures since temperatures higher than 150° C., even higher than 200° C., are often reached in underhood areas of automobiles. When plastic parts are exposed to such high temperatures for a prolonged period, such as in automotive under-the-...

Claims

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Application Information

Patent Timeline
04 Feb 2010
Publication
US20100029819A1
IPC
C08K5/053
CPC
C08G69/265; Y10T428/139; C08K5/005; C08K5/053; C08K5/06; C08L77/00; C08G69/36; C08L77/06
Inventors
PALMER, ROBERT J.; PEACOCK, JUDITH ALISON