Filler-containing film
AssigneeDexerials Corporation
InventorsReiji Tsukao, Takeshi Miyake
Life of this patent
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Abstract
In a filler-containing film in which fillers are dispersed in a resin layer, a flow of the fillers caused by an unnecessary flow of the resin layer is suppressed during the pressure bonding of the filler-containing film and an article. This filler-containing film (10A) includes a filler-dispersed layer (3) in which fillers (1) are dispersed in a resin layer (2). The surface in the vicinity of the fillers (1) of the resin layer (2) has concavities (2b) and (2c) with respect to the tangent plane to the central portion of the surface of the resin layer (2) between adjacent fillers (1). The ratio (La/D) of a layer thickness La of the resin layer (2) to a particle diameter D of the filler (1) is preferably from 0.6 to 10.
Claims33
A filler-containing film comprising:
- a filler-dispersed layer having first fillers dispersed in a resin layer, a surface of the resin layer in a vicinity of the first filler having a concavity with respect to a tangent plane to a central portion of the resin layer surface between adjacent first fillers,
- wherein the concavity is derived from plastic deformation of the resin layer occurred upon pushing the first fillers into the resin layer, and the concavity reduces an amount of resin directly above or around the first filler,
- wherein the first fillers are regularly arranged on the surface of the resin layer,
- wherein the resin layer has a melt viscosity of 1000 Pa·s to 15000 Pa·s,
- wherein a ratio of a distance Lb of a deepest part of the first filler from the tangent plane to the central portion of the resin layer surface provided with the concavity between the adjacent first fillers to a particle diameter D of the first filler (Lb/D) is from 60% to 105%, and
- wherein the resin layer further comprises second fillers that are insulating and different from the first fillers, are smaller than the first fillers, and have an average particle diameter of 20 to 1000 nm.
Dependencies are inferred from the claim text.