Metallic pipe having a hydrolysis-resistant layer of a polyamide moulding composition

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United States of America Patent

PATENT NO 9919494
APP PUB NO 20160060459A1
SERIAL NO

14835215

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Abstract

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A metallic pipe for contact with a hydrolyzing medium provides longer operating times and improved high temperature resistance. The pipe contains a layer of a polyamide moulding composition containing at least 50% by weight of polyamide content containing: I) 60 to 98 parts by weight of a polyamide which contains 10 to 70 meq/kg of a terminal carboxy group and has a relative solution viscosity ηrel of at least 1.90, and II) 2 to 40 parts by weight of a polyamine-polyamide graft copolymer produced from: a) 0.5 to 25% by weight, based on the entire monomer mixture, of a polyamine having at least 4 nitrogen atoms, and b) 75 to 99.5% by weight, based on the entire monomer mixture, of polyamide-forming monomers selected from lactams, ω-aminocarboxylic acids and/or equimolar combinations of diamine and dicarboxylic acid, with the proviso that the amino group concentration of the graft copolymer is in the range from 100 to 2500 meq/kg, wherein the sum of the parts by weight of I) and II) is 100.

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Patent Owner(s)

  • EVONIK DEGUSSA GMBH

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Baumann, Franz-Erich Dülmen, DE 93 2382
Beyer, Horst Marl, DE 20 180
Dowe, Andreas Dinslaken, DE 30 430
Franosch, Juergen Marl, DE 12 103
Pawlik, Andreas Recklinghausen, DE 23 248

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