Multilayer plastic pipe with polyamide inner and outer layers and a linear crystalline polyester intermediate layer

US5425817A · kind A · utility

Assignee

• Huels Aktiengesellschaft · DE

Inventors

• Joachim Mugge · Haltern, DE
• Stefan Rober · Hamburg, DE

Key dates

• Filing date: Nov 10, 1992
• Grant date: Jun 20, 1995
• Expiry date: Nov 10, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31736
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A multilayer plastic pipe having improved barrier action against diffusion of the substance being transported, particularly methanol-containing fuels, dimensional stability, and resistance to mechanical stress, is provided comprising: an inner layer and an outer layer, each of which comprise a polyamide-based molding composition, wherein the inner layer and outer layer may be the same or different, and at least one intermediate layer comprising a linear, crystalline polyester-based molding composition interposed between and bonding together the inner and outer layers.