Process for preparing layered foamed polymeric materials
AssigneeMATERIAS S.r.l.
InventorsErnesto Di Maio, Luigi Nicolais
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Abstract
The present invention concerns layered foamed polymeric materials lacking discontinuities at the interface between the layers and a preparation process thereof comprising the following steps: —providing a foamable polymeric material; —solubilising said one or more foaming agents in the foamable polymeric material under pressure and at a temperature greater than 20° C.; and —releasing the pressure instantaneously; where the solubilisation step is carried out with a pressure profile of said one or more foaming agents that is variable over time.
Claims14
A process for preparing a layered foamed polymeric material with one or more foaming agents, where said method comprises:
- providing a foamable polymeric material in a closed reactor and raising the pressure of the one or more foaming agents into the closed reactor up to a maximum of 300 bars;
- solubilising said one or more foaming agents in the foamable polymeric material under pressure and at a temperature greater than 20° C.;
- and
- releasing the pressure instantaneously;
- wherein said solubilising is carried out with a pressure profile of said one or more foaming agents that is variable over time,
- wherein said pressure profile which is variable over time in said solubilising of said one or more foaming agents in said foamable polymeric material generates a non-uniform profile of the concentrations of said one or more foaming agents in said foamable polymer, which upon foaming correspondingly generates a non-uniform morphology and density in said foamed polymeric material and
- wherein said pressure profile varies from a minimum pressure equal to atmospheric pressure to a maximum of 300 bars.
Dependencies are inferred from the claim text.