Production of low-shrinkage nylon moldings

US4590242A · kind A · utility

Assignee

• BASF SE

Inventors

• Peter Horn · Heidelberg, DE
• Hellmut Bunsch · Hamburg, DE
• Anton Hesse · Weinheim, DE
• Matthias Marx · Fürstenfeldbruck, DE
• Dietmar Nissen · Heidelberg, DE
• Walter Heckmann · Weinheim, DE

Key dates

• Filing date: Jul 14, 1983
• Grant date: May 20, 1986
• Expiry date: Jul 14, 2003

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G69/18
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Low-shrinkage nylon moldings are produced by activated alkaline lactam polymerization, preferably using the reactive injection molding technique, by a process wherein the polymerization is carried out in the presence of from 5 to 80% by weight of a polymer P which PA0 1. is completely soluble in the lactam, PA0 2. separates out in the course of polymerization at a conversion of from 1 to 50%, PA0 3. is composed of one or more blocks which are compatible with polylactam and one or more blocks which are incompatible therewith, and preferably PA0 4. possesses functional groups which are incorporated into the growing polylactam chain.