Prefoaming of poly(meth)acrylimide particles for subsequent foam moulding in closed tools

US10343314B2 · kind B2 · utility

Assignee

• Evonik Röhm GmbH · DE

Inventors

• Kay Bernhard · Darmstadt, DE
• Ina LIEBL · Griesheim, DE
• Denis Holleyn · Hofheim, DE
• Christoph Seipel · Babenhausen, DE

Key dates

• Filing date: Dec 3, 2014
• Grant date: Jul 9, 2019
• Expiry date: Jan 21, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2333/24
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a process for the production of prefoamed poly(meth)acrylimide (P(M)I) particles which can be further processed to give foam mouldings or composites. A feature of this process is that a polymer granulate is first heated and thus prefoamed in an apparatus by means of IR radiation of a wavelength suitable for this purpose. Said granulate can be further processed in subsequent steps, e.g. in a press mould with foaming to give a moulding or a composite workpiece with foam core.