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US 2006/0235097 A1Published application
Permeable foam
OwnerDebra-Jean Mahoney, Marguerite Livermore +2inventors
InventorsDebra-Jean Mahoney, Marguerite Livermore, Fredrick Mellish, Jeffrey Heil
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Abstract
The present invention relates to permeable closed cell foam. The foam may be produced by forming a substrate including a polymeric material, a foaming agent and optionally a crosslinking agent. Holes may be formed in the substrate and the substrate may be crosslinked. The foaming agent may then be activated to expand the foam. The closed cells may be present at a level of greater than about 50% in a given portion of any foam.
Claims20
A method for producing permeable closed cell foam comprising:
- forming a substrate including a polymer material and a foaming agent;
- crosslinking said substrate;
- forming holes in said substrate;
- and
- activating said foaming agent to expand said substrate.
2 more elements
A permeable foam comprising:
- a crosslinked foam comprising an expanded substrate wherein said expanded substrate includes closed cells;
- said closed cells are present at a level of greater than about 50% wherein said crosslinked foam is permeable;
- and
- wherein said permeability comprises a plurality of voids, said voids characterized as having been formed in said foam prior to expanding said substrate and forming said foam.
1 more element
Dependencies are inferred from the claim text.