Pressure-dependent foam moulding of poly(meth)acrylimide particles in closed moulds for producing rigid foam cores

US10207435B2 · kind B2 · utility

Assignee

• Evonik Röhm GmbH · DE

Inventors

• Kay Bernhard · Darmstadt, DE
• Ina LIEBL · Griesheim, DE
• Tim DENK · Großwallstadt, DE
• Florian Becker · Clamart, FR
• Thomas Richter · Wauseon, US

Key dates

• Filing date: Jun 25, 2015
• Grant date: Feb 19, 2019
• Expiry date: Feb 2, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2333/26
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a process for the production of mold-foamed poly(meth)acrylimide (P(M)I) cores, in particular of polymethacrylimide (PMI) cores, which can be used by way of example in automobile construction or aircraft construction. A feature of this process is that polymer granules or polymer powder preheated under pressure are moreover charged under pressure to a compression mold where they are foamed with depressurization. In particular, a feature of the process is that it optionally uses a preferably two-shell compression mold for the heating and also for the cooling of the granules and, respectively, the rigid foam core formed therefrom.