Nondistorted polyethylene foam structures and process for making
AssigneeThe Dow Chemical Company
InventorBruce A. Malone
Life of this patent
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Abstract
Disclosed is a closed-cell, non-crosslinked foam structure of a ratio of minor dimension to major dimension of about 1/8 or less comprising a plurality of coalesced extruded strands or profiles of a foamed polyolefin composition having an average cell size of from 0.02 to 0.5 millimeters. The cross-sectional geometry of the foam structure substantially corresponds to the overall arrangement of the orifices of the die from which the foamed polyolefin composition was extruded. Further disclosed is a process for making the above foam structure comprising extruding a foamable polyolefin composition through the multiorifice die to form the structure.
Claims15
A closed-cell, non-crosslinked foam structure comprising a plurality of coalesced extruded strands or profiles of a foamed polyolefin composition, the foamed polyolefin composition having an average cell size of from 0.02 to 0.5 millimeters, the foam structure having a ratio of minor dimension to major dimension in cross-section of about 1/8 or less, the cross-sectional geometry of the foam structure substantially corresponding to the geometry of the overall arrangement of the orifices of the die from which it was extruded.
A closed-cell, non-crosslinked foam structure comprising a plurality of coalesced extruded strands or profiles of a foamed polyolefin composition, the foamed polyolefin composition having an average cell size of from 0.02 to 0.5 millimeters, the foam structure having a ratio of minor dimension to major dimension in cross-section of about 1/8 or less, the cross-sectional geometry of the foam structure substantially corresponding to the desired cross-sectional geometry.
A process for making a closed-cell, non-crosslinked, substantially non-distorted extruded foam structure of a ratio of minor dimension to major dimension in cross-section of about 1/8 or less and comprised of a foamed polyolefin composition having an average cell size of from 0.02 to 0.5 millimeters, comprising:
- coextruding a foamable polyolefin composition capable of forming a foamed polyolefin composition having an average cell size of from 0.02 to 0.5 millimeters through a die defining a plurality of orifices therein having an overall arrangement of minor to major dimension of about 1/8 or less to form a plurality of coalesced extruded strands or profiles of the foamed polyolefin composition forming the foam structure.
Dependencies are inferred from the claim text.