Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2006-05-16
2006-05-16
Sellers, Robert (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C438S127000, C523S207000, C525S529000
Reexamination Certificate
active
07045562
ABSTRACT:
A method of self-healing cracks in a cured epoxy base underfill material between an I/C chip and a substrate is provided. A plurality of capsules is dispersed in the epoxy base. Each capsule has a curable thermosetting adhesive encapsulated in a rupturable shell to disperse the thermosetting adhesive in a crack in the epoxy base when the shell ruptures. Each capsule is less than 25 microns in diameter. A curing agent that will cause a reaction of the thermosetting adhesive on contact is dispersed in the epoxy to form a cured adhesive in a crack in said epoxy base. The shell will rupture when encountering a crack being propagated in the underfill material, which will at least partially fill the crack with the adhesive, and cure the adhesive with the curing agent to bond the edges of the crack together. The invention also includes the structure for crack self-healing.
REFERENCES:
patent: 5589523 (1996-12-01), Sawaoka et al.
patent: 6020385 (2000-02-01), Halle et al.
patent: 6235856 (2001-05-01), Hafner et al.
patent: 6261871 (2001-07-01), Langari et al.
patent: 6375872 (2002-04-01), Chao
patent: 6479167 (2002-11-01), Sumita et al.
patent: 6486099 (2002-11-01), Igari et al.
patent: 6500564 (2002-12-01), Shiobara et al.
patent: 6617046 (2003-09-01), Noro et al.
patent: 2004/0055686 (2004-03-01), Cowger et al.
CAPLUS accession No. 2002:175108, Sakurai, “Polymeric materials having autonomic heaing properties,” Kagaku to Kogyo, vol. 54, No. 11, 2001, abstract.
CAPLUS accession No. 2003:446302, Brown et al., “Fracture and fatigue behavior of a self-healing polymer composite,” Materials Research Society Symposium Proceedings, 2003, abstract.
CAPLUS accession No. 2003:595414, Kessler et al., “Self-healing structural composite materials,” Composites, Part A: Applied Science and Manufacturing, 2003, abstract.
White et al., “Autonomic healing of polymer composites,” Nature, vol. 409, 2001, pp. 794-797.
Brown et al., “In situ poly(urea-formaldehyde) microencapsulation of dicyclopentadiene,” Journal of Microencapsulation, vol. 20, No. 6, Nov.-Dec. 2003, pp. 719-730.
“Autonomic healing of polymer composites”, letters to nature, Nature 409, 794-797 (2001), Feb. 15, 2001.
“In situ(urea-formaldehyde) microencapsulation of dicyclopentadiene”, E.N. Brown et al, Journal of Microencapsulation pp. 1-14 plus List of Recent TAM Reports, 2003.
Hogg William N.
International Business Machines - Corporation
Sellers Robert
LandOfFree
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