Stock material or miscellaneous articles – Composite – Of epoxy ether
Reexamination Certificate
2006-08-08
2006-08-08
Feely, Michael J. (Department: 1712)
Stock material or miscellaneous articles
Composite
Of epoxy ether
C156S330000, C428S413000, C438S127000, C523S400000, C523S435000, C525S525000, C525S535000
Reexamination Certificate
active
07087304
ABSTRACT:
In accordance with the present invention, there are provided toughening agents which are useful for improving the performance properties of epoxy-based adhesive formulations. For example, epoxidized polysulfides have been found to be useful toughening agents of component level underfill adhesive compositions. Invention materials are liquid rubbers which provide improved fracture toughness while maintaining satisfactory capillary flow properties. Invention materials can be synthesized in neat (solventless) reactions from readily available low-cost raw materials and isolated in high yields. They have linear and branched telechelic structures with terminal epoxide functional groups, and are prepared without substantially increasing the molecular weight of the starting polysulfide materials. Invention materials are compatible with common epoxy formulations and may be used without purification. At low levels of incorporation, they provide adhesives that meet the minimum fracture toughness (Gq>2.0 lb/in) and capillary flow specifications (flow time<180 seconds) for many commercial underfill applications. In accordance with a further embodiment of the present invention, there are provided adhesive compositions comprising invention compounds and methods for use thereof. In additional embodiments of the present invention, there are provided methods for the preparation of invention toughening agents, methods for adhesively attaching a device to a substrate, and assemblies comprising first article(s) adhered to second article(s).
REFERENCES:
patent: 4017554 (1977-04-01), Villa
patent: 4692500 (1987-09-01), Hefner, Jr.
patent: 5447988 (1995-09-01), Dershem et al.
patent: 03-081374 (1991-04-01), None
English Abstract of JP 03-081374, provided by the JPO website.
“Thiokol LP-3” Construction Adhesives, Adhesives and Sealants, Rohm and Haas, Jan., 2001.
“Thioplast”, AKCROS Chemicals, Manchester, Great Britain, undated.
Konarski Mark M.
Luh Yuhshi
Woods John G.
Bauman Steven C.
Feely Michael J.
Henkel Corporation
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