Filler-containing film
AssigneeDexerials Corporation
InventorsTakeshi Miyake, Shoko Kuga, Reiji Tsukao
Life of this patent
Estimating the term…
Abstract
A filler-containing film that can be precisely pressed to an electronic component with lower thrust is a film having a filler distributed layer in which fillers are regularly disposed in a resin layer, wherein an area occupancy rate of the fillers in a plan view is 25% or less, a ratio La/D between a layer thickness La of the resin layer and a particle diameter D of the fillers is 0.3 or more and 1.3 or less, and a proportion by number of the fillers present in a non-contact state with each other is 95% or more with respect to the entire fillers. The proportion by number of the fillers present in a non-contact state with each other is preferably 99.5% or more with respect to the entire fillers.
Claims13
A filler-containing film comprising a filler distributed layer in which fillers are regularly disposed in a resin layer, wherein:
- an area occupancy rate of the fillers in a plan view is 25% or less,
- a ratio La/D between a layer thickness La of the resin layer and a particle diameter D of the fillers is 0.3 or more and 1.3 or less,
- a proportion of the fillers present in a non-contact state with each other is 95% or more with respect to the entire population of fillers, and
- an undulation is formed in a surface of the resin layer near the fillers with respect to a tangent plane to a central portion of the resin layer surface between adjacent fillers, wherein the surface of the resin layer immediately above the filler in the undulation is below the tangent plane.
Dependencies are inferred from the claim text.