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US 7,199,165 B2Granted
Expandable material
AssigneeL&L Products, Inc.
InventorsAbraham Kassa, Matthew Harthcock, Jeffrey Apfel
Life of this patent
Estimating the term…
Abstract
An expandable material and articles incorporating the same are disclosed. The material includes a polymeric admixture; a blowing agent; a curing agent; a tackifier; and optionally, a filler or fiber.
Claims19
An expandable material, comprising:
- about 10% to about 70% by weight of a polymeric admixture, the polymeric admixture including one or more acrylates and one or more acetates;
- about 6.0% to about 20% tackifier, the tackifier being a hydrocarbon resin;
- about 0.1% to about 10% by weight epoxy resin;
- 5.5% or greater blowing agent, blowing agent accelerator or both;
- a curing agent;
- and
- one or more fillers, the one or more fillers including calcium carbonate or aramid pulp;
- wherein, upon exposure to a temperature greater than about 180° C., the expandable material expands to a volume that is at least 2000% greater than the volume of the expandable material in an unexpanded state.
5 more elements
An expandable material as in ctaim 1 further comprising an anti-oxidant.
An expandable material, comprising:
- about 10% to about 70% by weight of a polymeric admixture, the polymeric admixture including:
- i) about 20% to about 95% of one or more acrylates, the one or more acrylates including epoxidized acrylate copolymer and a copolymer of an ethylene butyl acrylate and ethylene methyl acrylate and an acrylate coagent;
- and
- ii) about 5% to about 50% of one or more acetates, the one or more acetates including a relatively high content ethylene vinyl acetate and relatively low melt index ethylene vinyl acetate;
- about 6.0% to about 20% tackifier, the tackifier being a hydrocarbon having two or more degress of unsaturation;
- about 0.1% to about 10% by weight epoxy resin, the epoxy resin including at least one of a novalac type resin or a bisphenol resin;
- 8% or greater blowing agent and blowing agent accelerator, the blowing agent being selected from an amine or amide and the blowing agent accelerator being selected from a metal salt or an oxide;
- a peroxide based curing agent;
- about 3% to about 30% one or more fillers, the one or more fillers including calcium carbonate and aramid pulp;
- and
- a dispersant, the dispersant being EPDM
- wherein, upon exposure to elevated temperature, the expandable material expands to at least 3000% of its original size.
9 more elements
Dependencies are inferred from the claim text.