Barrier film-containing format and the use thereof for pre-applied underfill film for 3D TSV packages
Provided herein are stabilized underfill film-containing assemblies which extend the work-life of underfill films. In accordance with certain aspects of the present invention, there are also provided stabilized underfill film-containing assemblies which extend the shelf-life of underfill films. In certain aspects of the present invention, there are also provided methods for extending the work-life of underfill films. In another aspect of the present invention, there are also provided methods for extending the shelf-life of underfill films.
1. An underfill film-containing assembly, said assembly comprising:
an underfill film layer consists of a thermoset resin, a hardener, and a filler, the underfill film layer being disposed between
a coating release liner which is a paper or plastic-based film sheet that undergoes substantially no chemical interaction with the underfill film layer, and
a barrier film which is substantially impervious to chemical migration into or out of a surface thereof and comprises a fluoropolyolefin selected from an ETFE (copolymer of ethylene and tetrafluoroethylene), a perfluoroalkoxy, a PCTFE (polychloro trifluoroethylene) film, an FEP (fluorinated ethylene propylene copolymer), or a PVDF (polyvinylidene difluoride), wherein the assembly further includes:
a layer of pressure sensitive adhesive tape on an exposed side of the barrier film opposite the underfill film layer.
2. The assembly of claim 1 , wherein said thermoset resin is selected from an epoxy-based resin, a maleimide-based resin, a nadimide-based resin, an itaconamide-based resin, an acrylate-based resin, cyanate ester-based resins, silicones, oxetanes, polyester-based resins, polyurethane-based resins, polyimide-based resins, melamine-based resins, urea-formaldehyde-based resins, phenol-formaldehyde-based resins, as well as mixtures of any two or more thereof.
3. The assembly of claim 1 wherein the underfill film layer has a thickness in the range of about 5 μm up to about 200 μm.
4. The assembly of claim 1 wherein the coating release liner is plastic based film sheet.
5. The assembly of claim 4 wherein the plastic based film sheet is selected from polyethylene terephthalate (PET), a polyolefin, or a silicone.
6. The assembly of claim 1 wherein the barrier film has a thickness in the range of about 1 nm up to about 200 μm.
7. The assembly of claim 1 wherein a pressure sensitive adhesive of the pressure sensitive adhesive tape is an elastomeric acrylic-based resin.
8. The assembly of claim 1 wherein:
said plastic based film sheet comprises PET.
9. The assembly of claim 8 wherein:
a pressure sensitive adhesive of the pressure sensitive adhesive tape comprises elastomers based on acrylic polymers, rubber, ethylene-vinyl acetate, nitriles, or styrene block copolymers.