Polyolefin foam useful for sound and thermal insulation
AssigneeDow Global Technologies LLC
InventorsChung P. Park, Michel Brucker, Georges Eschenlauer, Michael E. Schaller, Jean-Francois Koenig
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Abstract
An extruded, coalesced foam strand propylene polymer material that is either open-celled and useful for sound insulation applications or close celled and useful for thermal insulation applications. An apparatus suitable for preparing such foams with an expanded cross-section.
Claims20
An extruded, open-cell, coalesced foam strand material that comprises a propylene polymer material and has a density of 20 kilograms per cubic meter or less, an open-cell content of at least 20 percent and a cell size of two millimeters or less.
An extruded, open-cell, acoustically active, coalesced foam strand material that comprises a propylene polymer material and has a density of 100 kilograms per cubic meter or less, an open-cell content of at least 50 percent, a cell size of two millimeters or less and, in its extrusion direction, a noise reduction coefficient of at least 0.3, the foam having defined therein a plurality of perforation channels, the channels being oriented in a direction generally perpendicular to the extrusion direction.
An extruded, open-cell, coalesced foam strand material that comprises a propylene polymer material and has a density ≦22 kg/m3 and an open-cell content ≧80 percent.
Dependencies are inferred from the claim text.