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US 12,760,205 B2Granted
Electrically conductive adhesive film
Assignee3M Innovative Properties Company
InventorsTaehoon Noh, Jeongwan Choi
Life of this patent
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Abstract
An electrically conductive adhesive film includes an adhesive layer having opposing first and second major surfaces spaced apart a distance T in a thickness direction of the adhesive layer, where T≥20 microns, and a plurality of electrically conductive particles dispersed in the adhesive layer between the first and second major surfaces. For at least 90% of the electrically conductive particles in the plurality of electrically conductive particles, the electrically conductive particles have a particle diameter D50 greater thank T/4 and a maximum size of the electrically conductive particles is less than T.
Claims19
An electrically conductive adhesive film comprising:
- an adhesive layer comprising opposing first and second major surfaces spaced apart a distance T in a thickness direction of the adhesive layer, T≥20 microns;
- and
- a plurality of electrically conductive particles dispersed in the adhesive layer between the first and second major surfaces, wherein for at least 90% of the electrically conductive particles in the plurality of electrically conductive particles, the electrically conductive particles have a particle diameter D50 greater than T/4 and a maximum size of the electrically conductive particles is less than T,
- wherein the electrically conductive adhesive film is patterned such that at least one first region of the electrically conductive adhesive film comprises a higher concentration of the electrically conductive particles and a least one second region of the electrically conductive adhesive film comprises a lower concentration of the electrically conductive particles, the at least one first region comprising a regular array of discrete spaced apart first regions, each first and second region comprising a plurality of the electrically conductive particles, the electrically conductive particles of each first region irregularly arranged in the first region to provide an electrically conductive path between the first and second major surfaces of the adhesive layer, the particles of each second region arranged to provide an electrically conductive path between adjacent first regions,
- wherein adjacent first regions are electrically connected to one another only by virtue of the electrically conductive particles in the at least one second region.
2 more elements
An electrically conductive adhesive film comprising:
- an adhesive layer comprising opposing first and second major surfaces spaced apart a distance T in a thickness direction of the adhesive layer, T≥20 microns;
- and
- a plurality of electrically conductive particles dispersed in the adhesive layer between the first and second major surfaces and having particle diameters D10, D50 and D90, D50 greater than T/4, D90 less than 0.9 T, D90/D10 less than 3.5, wherein for each particle in at least a majority of the electrically conductive particles, an outermost surface of the particle fits between concentric larger and smaller spheres, the larger sphere having a diameter of no more than about 4 times a diameter of the smaller sphere,
- wherein the electrically conductive adhesive film is patterned such that at least one first region of the electrically conductive adhesive film comprises a higher concentration of the electrically conductive particles and a least one second region of the electrically conductive adhesive film comprises a lower concentration of the electrically conductive particles, the at least one first region comprising a regular array of discrete spaced apart first regions, each first and second region comprising a plurality of the electrically conductive particles, the electrically conductive particles of each first region irregularly arranged in the first region to provide an electrically conductive path between the first and second major surfaces of the adhesive layer, the particles of each second region arranged to provide an electrically conductive path between adjacent first regions,
- wherein adjacent first regions are electrically connected to one another only by virtue of the electrically conductive particles in the at least one second region.
2 more elements
Dependencies are inferred from the claim text.