Expandable material

a technology of expandable materials and expandable materials, applied in the field of expandable materials, can solve the problems of difficult to provide an expandable material with a relatively high expansion level, and the design of such materials with two or more of these characteristics can present difficulties, and achieve the effect of sag resistance, self-support ability, and aid in flow control

Inactive Publication Date: 2007-05-24
L & L PROD INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004] Accordingly, the present invention provides an expandable material, which may be employed for sealing, baffling, reinforcing, structural bonding or the like of a variety of structures. The material is typically an expandable adhesive material and also typically includes one or more of the following components: a polymeric admixture; an epoxy resin; a filler; a blowing agent; a curing agent; an accelerator for the blowing agent or the curing agent; a tackifier; a coagent; an anti-oxidant; combinations thereof or the like. Preferably, the polymeric admixture includes an acrylate, an acetate or both, although not required. One preferred reinforcement material is a pulped form of aramid fiber, which can assist in flow control, sag resistance and / or self-support ability of the material.

Problems solved by technology

Design of such materials with two or more of these characteristics can present difficulties however.
For example, it can be difficult to provide an expandable material that exhibits a relatively high level of expansion without sacrificing characteristics such as adhesion, homogeneity of expansion or the like.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example

[0054] Table B shows a formulation for one exemplary expandable material.

TABLE BIngredient name:% by weightCopolymer of Ethylene Butyl Acrylate and34.20Ethylene Methyl AcrylateHigh Ethylene content Ethylene Vinyl Acetate15.00Epoxy Modified Acrylate Copolymer6.00Low Molecular Weight Ethylene Vinyl Acetate6.00Epoxy resin1.00A tackifier resin or agent (e.g., a hydrocarbon11.70resin, a rosin ester, a terpentine)Acrylate coagent for cure density control (e.g.,0.60dipentaerythritol pentaacrylate)Curing agent (e.g., peroxide based curing1.50agent)Curing agent - 60° C.-100° C. activation0.20Americure curing agent0.10Blowing agent accelerator (e.g., Zinc Oxide)1.50Blowing agent (e.g., azodicarbonamide)9.00Around 30% Aramid pulp + around 70% EPDM1.0Pigment0.2Calcium carbonate11.5Anti-oxidant0.5

[0055] Formation and Application of the Expandable Material

[0056] Formation of the expandable material can be accomplished according to a variety of new or known techniques. Preferably, the expandabl...

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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.

Description

[0001] The present application claims the benefit of the filing date of U.S. Provisional Application Ser. No. 60 / 482,897, filed Jun. 26, 2003, hereby incorporated by reference.FIELD OF THE INVENTION [0002] The present invention relates generally to an expandable material. More preferably, the present invention relates to an expandable material that exhibits a property such as substantially homogeneous expansion, a high level of expansion, improved cohesiveness, a combination thereof or the like. BACKGROUND OF THE INVENTION [0003] For many years, industry has been concerned with designing materials such as adhesives, baffle materials, structural materials or the like, which exhibit desired characteristics. As examples, the transportation industry and, particularly, the automotive industry has been concerned with designing expandable materials that exhibit characteristics such as low weight, good adhesion, sound absorption, sound damping, relatively high levels of expansion, homogeneo...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08J9/00C08J9/10
CPCC08J9/0061C08J9/103C08J2207/02C08J2423/08C08J2333/06C08J2431/00C08J2201/026C08J2331/00
Inventor KASSA, ABRAHAMHARTHCOCK, MATTHEWAPFEL, JEFFREY
Owner L & L PROD INC
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