US Patent No. 10,090,076

ANISOTROPIC CONDUCTIVE POLYMER MATERIAL


Patent No. 10,090,076
Issue Date October 02, 2018
Title Anisotropic Conductive Polymer Material
Inventorship Matti Knaapila, Nittedal (NO)
Mark Buchanan, Oslo (NO)
Geir Helgesen, Finstadjordet (NO)
Assignee Condalign AS, Kjeller (NO)

Claim of US Patent No. 10,090,076

1. A method for producing a polymer composition with the ability to be cured by UV light to an anisotropic electrically conductive polymer layer, comprising the steps of:providing a non-conductive matrix of a flowable polymer composition having inherent photocurability;
adding to said matrix conductive particles having a predetermined aspect ratio in an amount sufficiently low to allow the concentration of the conductive particles to be maintained at a level lower than the percolation threshold of isotropic mixture; and
placing the thus formed composition in a receptacle in which exposure to UV light is prevented;
wherein the aspect ratio is defined as the ratio between the largest linear dimension of a particle and the largest dimension perpendicular to said largest dimension,
wherein the aspect ratio for a majority of the conductive particles is in the range below 5,
wherein the aspect ratio for at least 75% of the particles is in the range below 10, and
wherein the aspect ratio for at least 90% of the conductive particles is in the range below 20.