Polymer articles including maleic anhydride and ethylene-vinyl acetate copolymers
AssigneeSentinel Products Corp.
InventorsMatthew L. Kozma, John D. Bambara, Robert F. Hurley, Scott C. Smith
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Abstract
Polymer articles including ethylene-vinyl acetate and maleic anhydride are described. The ethylene-vinyl acetate can be a high vinyl acetate content ethylene-vinyl acetate. The articles include foamed articles and non-foamed articles. The foamed articles have improved characteristics and properties, such as surface bonding properties.
Claims57
A method of making a foamed polymer article comprising:
- providing a mixture including maleic anhydride and an ethylene-vinyl acetate copolymer having a vinyl acetate content between about 9 and about 60 percent, the maleic anhydride being grafted to a portion of the mixture;
- and
- incorporating a blowing agent into said mixture and foaming and
- cross-linking the mixture sufficiently to form a flexible foamed article having low tackiness.
A foamed article comprising a mixture including an ethylene-vinyl acetate copolymer having a vinyl acetate content between about 9 and about 60 percent, and maleic anhydride grafted to a component of the mixture, wherein the mixture is cross-linked sufficiently to provide a flexible article having low tackiness.
A foamed article comprising a mixture including an ethylene-vinyl acetate copolymer having a vinyl acetate content between about 9 and about 60 percent, and a maleic anhydride grafted polyolefinic polymer, wherein the mixture is foamed and cross-linked sufficiently to provide a flexible foamed article having low tackiness.
A method of manufacturing a foamed polymer article comprising:
- providing a mixture including maleic anhydride and an ethylene-vinyl acetate copolymer having vinyl acetate content between about 9 and about 60 percent, the maleic anhydride being red to a portion of the mixture;
- cross-linking the mixture sufficiently to form a flexible polymer article having low tackiness by a silane, a peroxide, irradiation, or a combination thereof;
- and
- expanding the mixture to form a foamed polymer article in a vertical oven,
- wherein the foamed polymer article has a thickness between about 0.015 and ⅝ inch and a density between about 1.5 and 40 pounds per cubic foot.
Dependencies are inferred from the claim text.