Method of making coextruded crosslinked polyolefin foam with polyamide cap layers
AssigneeToray Plastics (America), Inc.
InventorsPawel SIERADZKI, Jesse Jude BALDWIN, Dan BEN-DAAT, Kaitlyn Michelle BOCK
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Abstract
Described herein are physically crosslinked, closed cell continuous multilayer foam structures that includes a foam layer comprising polypropylene, polyethylene, or a combination of polypropylene and polyethylene and a polyamide cap layer. The multilayer foam structure can be obtained by coextruding a multilayer structure comprising at least one foam composition layer and at least one cap composition layer, irradiating the coextruded structure with ionizing radiation, and continuously foaming the irradiated structure.
Claims21
A method of forming a multilayer foam structure comprising:
- coextruding:
- a first layer comprising:
- polypropylene, polyethylene, or a combination of polypropylene and polyethylene;
- and
- a chemical foaming agent;
- and
- a second layer on a side of the first layer, the second layer comprising:
- polyamide;
- and
- polypropylene, polyethylene, or a combination of polypropylene and polyethylene;
- irradiating the coextruded layers with ionizing radiation;
- and
- foaming the irradiated, coextruded layers.
Dependencies are inferred from the claim text.