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US 11,590,677 B2Granted
Method of making coextruded, crosslinked polyolefin foam with KEE cap layers
AssigneeToray Plastics (America), Inc.
InventorsDan Ben-Daat, Jesse Jude Baldwin, Kaitlyn Michelle Bock, Pawel Sieradzki
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Abstract
The present disclosure is directed to a physically crosslinked, closed cell continuous multilayer foam structure comprising at least one foam polypropylene/polyethylene layer with a KEE cap layer. The multilayer foam structure can be obtained by coextruding a multilayer structure comprising at least one foam layer composition layer with at least one cap layer composition layer, irradiating the coextruded structure with ionizing radiation, and continuously foaming the irradiated structure.
Claims19
A method of forming a multilayer structure comprising:
- coextruding:
- a first layer comprising:
- polypropylene, polyethylene, or a combination of polypropylene and polyethylene;
- a chemical foaming agent;
- and
- a second layer on a side of the first layer, the second layer consisting of:
- 15-85 wt. % ketone-ethylene-ester (KEE) terpolymer, wherein the ester of the KEE comprises an acrylate;
- optionally, 1-8 wt. % additives;
- and
- polypropylene, polyethylene, or a combination of polypropylene and
- polyethylene;
- irradiating the coextruded layers with ionizing radiation;
- foaming the irradiated, coextruded layers;
- and
- adhering a polyvinyl chloride (PVC) layer to a side of the second layer opposite the first layer, wherein the multilayer structure does not include a corona, plasma, or chemical surface treatment, or an adhesion primer or adhesive between the second layer and the PVC layer.
12 more elements
Dependencies are inferred from the claim text.