Evonik Roehm Gmbh

Evonik Rohm Gmbh

Ina Liebl

Kay Bernhard

Thomas Richter

Christoph Seipel

Florian Becker

Tim Denk

Denis Holleyn

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.

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

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.

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

Growing community of inventors

Griesheim, Germany

Ina Liebl