Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2007-07-20
2010-11-16
Jagannathan, Vasu (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S101000, C524S492000, C524S555000, C523S451000, C523S452000, C523S455000, C428S209000
Reexamination Certificate
active
07834070
ABSTRACT:
The invention provides a halogen-free and thermal resistant composition, including a mixture of bismaleimide and maleimide with molar ratio of 99:1-50:50; a barbituric acid, wherein the molar ratio of the mixture and the barbituric acid is 93:7-80:20; and an epoxy resin, wherein (the mixture with the barbituric acid) and the epoxy resin have a weight ratio of 5:95 to 50:50. The mixture undergoes reaction at 110-130° C. for about 2˜7 hours to form a maleimide modified epoxy resin. The procedure of forming the composition is solvent-free, thereby providing improved integrity for electronic packaging, lower curing temperature, and a simplified process.
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English language translation of TW 466265 “High-Performance Adhesive Compositions” Chen Jr-Chiang, et al. published Dec. 2001.
Han et al, Journal of Applied Polymer Science, “Interpenetrating polymer networks of bismaleimide and polyurethane-crosslinked epoxy” vol. 70, Issue 3, Oct. 17, pp. 529-539 (1998).
Hsu Jung-Mu
Lee Tzong-Ming
Pan Jing-Pin
Tseng Feng-Po
Birch & Stewart Kolasch & Birch, LLP
Industrial Technology Research Institute
Jagannathan Vasu
Kollias Alexander C
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