Gel for localized removal of reworkable encapsulant
AssigneeInternational Business Machines Corporation
InventorsStephen Leslie Buchwalter, Jeffrey Donald Gelorme, Nancy C. LaBianca
Life of this patent
Estimating the term…
Abstract
Reworkable encapsulant formulations are being developed to allow recovery of part-good microelectronic assemblies. According to this invention, a gelled form of the solvent is useful for removing the reworkable encapsulant from a specific region of the assemblies without affecting components on the assembly which do not need to be reworked. This novel method eliminates expensive tooling that would otherwise be required to handle the solvent.
Claims7
A composition of matter for spot removal of a crosslinked material, said composition of matter being comprised of an effective removal amount of an acid to break the crosslinks of said crosslinked material to form an uncrosslinked material, an effective removal amount of a solvent for said uncrosslinked material, and an effective removal amount of a thickening agent to gel said composition of matter.
Dependencies are inferred from the claim text.