Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2005-07-12
2005-07-12
Sellers, Robert (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C427S386000, C438S127000, C525S481000, C525S485000, C525S486000, C525S526000, C525S528000, C549S523000, C549S546000, C560S055000, C560S060000, C560S064000, C560S128000, C560S183000
Reexamination Certificate
active
06916890
ABSTRACT:
The present invention discloses reworkable epoxy compositions suitable for encapsulation of and underfill for electronic components including (a) the epoxidized reaction product of a multifunctional 1-alkenyl ether or 1-cycloalkenyl ether and an alkenyl carboxylic acid, the epoxidized reaction product having two or more thermally labile alpha-alkoxy ester linkages; and (b) a curing agent for the epoxy component. The epoxy composition, when cured, provides a composition which is thermally reworkable, the weak α-alkoxy ester linkages providing for the reworkable aspect of the invention.
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Morrill Susanne D.
Woods John G.
Bauman Steven C.
Henkel Corporation
Sellers Robert
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