Compositions and methods for providing anisotropic...

H - Electricity – 01 – F

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H01F 1/44 (2006.01) H01F 41/16 (2006.01) H01R 4/04 (2006.01) H05K 3/32 (2006.01)

Patent

CA 2158941

The invention provides a composition (3) comprising: (i) a ferrofluid comprising a colloidal suspension (4) of ferromagnetic particles in a non- magnetic carrier liquid, and (ii) a plurality of electrically-conductive particles (5) having substantially uniform sizes and shapes, dispersed in the ferrofluid. Various types of substantially non-magnetic electrically- conductive particles (5) are described. Application of a substantially uniform magnetic field by magnet means (8) to the composition (3) causes the electrically-conductive particles (5) to form a regular pattern (9). The composition is used for providing anisotropic conductive pathways (9a, 9b) between two sets of conductors (2a, 2b; 7a, 7b) in the electronics industry. The composition may be a curable adhesive composition which bonds the conductors. Alternatively or in addition the electrically-conductive particles may have a latent adhesive property e.g. the particles may be solder particles. The ferrofluid may be a colloidal suspension of ferromagnetic particles in a liquid monomer.

Composition (3) comportant: (i) un ferrofluide contenant une suspension colloïdale (4) de particules ferromagnétiques dans un liquide véhicule non magnétique, et (ii) une pluralité de particules électroconductrices (5) ayant des dimensions et formes sensiblement homogènes et étant dispersées dans le ferrofluide. On décrit différents types de particules électroconductrices sensiblement non magnétiques (5). Lorsque l'on soumet la composition (3) à un champ magnétique sensiblement homogène à l'aide d'un aimant (8), les particules électroconductrices (5) forment une configuration régulière (9). La composition permet de former des chemins conducteurs anisotropes (9a, 9b) entre deux groupes de conducteurs (2a, 2b; 7a, 7b) dans l'industrie de l'électronique. Ladite composition peut être une composition adhésive durcissable assurant la liaison des conducteurs. En variante ou comme caractéristique supplémentaire, les particules électroconductrices peuvent présenter une propriété d'adhésivité latente, c'est-à-dire que les particules peuvent être des particules de soudure. Le ferrofluide peut être une suspension colloïdale de particules ferromagnétiques dans un monomère liquide.

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