Evonik Operations Gmbh

Evonik Roehm Gmbh

Evonik Rohm Gmbh

Florian Becker

Thomas Richter

Vincent Ma Junyong

Kay Bernhard

Christoph Seipel

Christian Traßl

Felix Goldmann

Tim Denk

Andreas Liebe

Ina Liebl

Mathias Hempler

Matthias Alexander Roth

Jorge Manuel Pinto

Ulrich Schmidt

Lisa Langel

PMMA-based rigid foams can be used as the core material of sandwich components in rotor blades of wind power plants and in boatbuilding.

Process for producing polymethyl methacrylate rigid foams as core materials in rotor blades of wind power plants and in boatbuilding

(Rigid) foams can be produced by heating a blowing agent containing polymers through the combination of thermal energy with irradiation by microwaves.

Foaming of blowing agent containing polymers through the use of microwaves

A production process can produce foam materials from polymer compositions. This process involves preheating in the foaming of polymers containing blowing agents and subsequent foaming by a thermal process assisted by microwaves.

Foaming process for production of foam materials

A process can be used for producing foam panels, for the production of foam films, composed of a polymer having a glass transition temperature Tof at least 100&#xb0; C. An average cell diameter of the foam panels measured according to the standard ASTM D 3576 is between 20 &#x3bc;m and 250 &#x3bc;m, and less than 20 cells having a diameter &#x3e;260 &#x3bc;m are present per m. The elongation at break of the foam is 4%-13% measured according to ASTM D 638.

Process for producing foam panels for the production of foam films

The present invention relates to a method for cutting rigid foams, especially slabstock P(M)I foams. A method is provided here, by means of which it is possible to cut these rigid foams even in relatively high layer thicknesses of, for example, more than 3 mm, without material loss, which is produced in relevant amounts, for example, in the course of sawing as a result of the sawdust formed.

Splitting of thick hard-foam plates

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

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Darmstadt, Germany

Florian Becker