Pre-applied underfill film containing nano-particulate filler for 3DIC applications, compositions useful for the preparation thereof, and uses thereof

A composition comprising:

• 10-25 wt. % of at least one radical polymerizable monomer comprising at least 20 wt. % of a (meth)acrylate monomer and at least 20 wt. % of at least one monomer selected from the group consisting of a maleimide monomer, a nadimide monomer, and an itaconimide monomer;
• 5-20 wt. % of a polymer having one or more polar groups selected from the group consisting of a hydroxyl group, a carboxyl group, and a (meth)acryloyl group;
• optionally, an epoxy monomer;
• optionally, an epoxy cure agent;
• 0.1-0.5 wt. % of a free-radical polymerization initiator;
• 40-60 wt. % of a particulate filler, wherein at least 5 wt. % of said filler has a particle size in the range of about 2-150 nanometers, and the remaining filler has a particle size no greater than 5 microns;
• optionally a radical stabilizer;
• and
• optionally a non-reactive organic diluent therefore,
• wherein the melt viscosity of said composition is less than 20,000 poise, when measured at a ramp rate of 5-10° C./minute.