Coextruded, crosslinked multilayer polyolefin foam structures with crosslinked, polyolefin cap layers and methods of making the same
AssigneeToray Plastics (America), Inc.
InventorsJesse Jude BALDWIN, Dan BEN-DAAT, Kaitlyn Michelle BOCK, Pawel SIERADZKI
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Abstract
Disclosed herein are physically crosslinked, closed cell continuous multilayer foam structures that include a coextruded foam layer containing at least one of polypropylene and polyethylene and a crosslinked, coextruded cap layer containing at least one of polypropylene and polyethylene. 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.
Claims20
A method of forming a multilayer structure comprising:
- coextruding:
- a foam layer comprising:
- at least one of polypropylene and polyethylene;
- a chemical foaming agent;
- a crosslinking agent;
- and
- a film layer on a side of the foam layer, the film layer comprising:
- at least 90 wt. % of at least one of polypropylene and polyethylene;
- and
- 0.1-5 wt. % of a crosslinking agent.
A method of forming a multilayer foam structure comprising:
- coextruding:
- a foam layer comprising:
- at least one of polypropylene and polyethylene;
- a chemical foaming agent;
- a crosslinking agent;
- and
- a film layer on a side of the foam layer, the film layer comprising:
- at least 90 wt. % of at least one of polypropylene and polyethylene;
- and
- 0.1-5 wt. % of a crosslinking agent;
- irradiating the coextruded layers with ionizing radiation;
- and
- foaming the irradiated, coextruded layers.
Dependencies are inferred from the claim text.