Polyolefin foams for footwear foam applications
AssigneeE. I. Du Pont de Nemours and Company
InventorRichard T. Chou
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Abstract
A composition that can be used as foam composition is disclosed, which comprises or is produced from an ethylene acrylate dipolymer, an acid copolymer, and optionally a soft ethylene polymer. The ethylene acrylate dipolymer comprises repeat units derived from ethylene and at least one alkylacrylate. The acid copolymer comprises repeat units derived from ethylene and acrylic acid, methacrylic acid, or combinations thereof. The soft ethylene polymer comprises ethylene and an α-olefin, vinyl acetate, or combinations thereof.
Claims19
An article comprising, or produced from, an ethylene acrylate dipolymer, an acid copolymer, and optionally a copolymer of ethylene and an α-olefin wherein
- the article is a footwear foam having a density lower than 2 g/cc, a foam hardness of about 25 to about 55 Asker C;
- a split tear strength of at least 2.5 kg/cm;
- and a compression strength of at least 28 pounds/in2;
- the ethylene acrylate dipolymer is derived from ethylene and a comonomer selected from the group consisting of methacrylate, acrylate, C1 to C8 alkyl acrylate, and combinations of two or more thereof;
- and the ethylene acrylate dipolymer is substantially free of a third comonomer;
- and
- the acid copolymer comprises repeat units derived from ethylene and an acid monomer selected from the group consisting of (meth)acrylic acid, maleic acid, fumaric acid, maleic anhydride, fumaric anhydride, maleic acid monoester, fumaric acid monoester, and combinations of two or more thereof.
A foam composition comprising or produced from, based on the weight of the composition, about 50 to about 95 wt % of an ethylene alkyl acrylate dipolymer or ethylene methacrylate dipolymer, about 10 to about 30 wt % of an ethylene acrylic acid dipolymer or ethylene methacrylic acid dipolymer, and an ethylene α-olefin dipolymer wherein the foam composition has a density lower than 2 g/cc, a foam hardness of about 25 to about 55 Asker C;
- a split tear strength of least 2.5 kg/cm;
- and a compression strength of at least 28 pounds/in2.
Dependencies are inferred from the claim text.