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US 9,669,600 B2Granted
Coextruded, crosslinked multilayer polyolefin foam structures from recycled polyolefin foam material and methods of making the same
AssigneeToray Plastics (America), Inc.
InventorsJesse Baldwin, Kaitlyn M. Bock, Pawel Sieradzki
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Abstract
A physically crosslinked, closed cell continuous multilayer foam structure comprising at least one polypropylene/polyethylene coextruded foam layer is obtained. The multilayer foam structure is obtained by coextruding a multilayer structure comprising at least one foam composition layer, irradiating the coextruded structure with ionizing radiation, and continuously foaming the irradiated structure.
Claims24
A method of forming a multilayer structure comprising:
- coextruding:
- a first layer comprising:
- polypropylene or polyethylene;
- and
- a first chemical foaming agent;
- and
- a second layer on a side of the first layer, the second layer comprising:
- 5-50 wt. % recycled, crosslinked polyolefin foam material comprising cryogenically pulverized polyolefin foam material;
- 50-95 wt. % polypropylene, polyethylene, or a combination of polypropylene and polyethylene;
- and
- a second chemical foaming agent.
8 more elements
A method of forming a multilayer foam structure comprising:
- coextruding:
- a first layer comprising:
- polypropylene or polyethylene;
- and
- a first chemical foaming agent;
- and
- a second layer on a side of the first layer, the second layer comprising:
- 5-50 wt. % recycled, crosslinked polyolefin foam material;
- 50-95 wt. % polypropylene, polyethylene, or a combination of polypropylene and polyethylene;
- and
- a second chemical foaming agent;
- irradiating the coextruded layers with ionizing radiation;
- and
- foaming the irradiated, coextruded layers.
11 more elements
Dependencies are inferred from the claim text.