Highly branched polyamide graft copolymers

US6391982B1 · kind B1 · utility

Assignee

• Degussa AG · DE

Inventors

• Harald Haeger · Thedinghausen, DE
• Ralf Richter · Dresden, DE
• Georg Oenbrink · Schneverdingen, DE

Key dates

• Filing date: Jun 29, 2000
• Grant date: May 21, 2002
• Expiry date: Jul 25, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S424/16
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A graft copolymer is prepared by a process comprising:graft polymerizing a polyamide-forming monomer selected from the group consisting of lactams and &ohgr;-aminocarboxylic acids and an oligocarboxylic acid selected from the group consisting of from 0.015 to about 3 mol. % of dicarboxylic acid and from 0.01 to about 1.2 mol. % of tricarboxylic acid, in each case the stated amounts of oligocarboxylic acid based on a molar amount of lactam, &ohgr;-aminocarboxylic acid or combination thereof, onto from 0.5 to 25% by weight, based on the graft copolymer, of a polyamine having at least 11 nitrogen atoms and a number-average molecular weight Mn of at least 500 g/mol., wherein the amino group concentration in the graft copolymer ranges from 100 to 2500 mmol./kg.