Electrically conductive silicone composition with high adhesion strength

An electrically conductive composition consisting of:

• a. a silicone resin comprising at least one vinyl-group present in amounts of 11% to 35% by weight of the conductive composition;
• b. a silicone cross-linker having at least one Si—H group;
• c. electrically conductive particles present in amounts of 50% to 70% by weight of the conductive composition;
• d. a solvent present from 0.1 to 10% by weight of the conductive composition;
• e. an adhesion promoter;
• f. a catalyst;
• g. an inhibitor;
• and
• h. optionally, rheological additives, conductivity promotors, dispersing agents, anti-bleed agents, defoamers and mixtures thereof,
• wherein the Si—H groups and the vinyl-groups are present in a ratio equal to or greater than 1.3 but equal or less than 10;
• the composition has a die strength at 150° C. of 1-1.53 kg and an electrical contact resistance after 500 cycles of thermal cycling of 19-29 mOhms from −40° C. to 85° and back to −40° C.;
• and
• wherein the silicone resin is selected from the group consisting of
• wherein a is 1-1000, and R1, R2, R3, R4 are same or different and independently selected from the group consisting of methyl-group, ethyl-group and phenyl-group;
• wherein b+c+x is 1-1000, and R5, R6, R7, R8, R9 and R10 are same or different and independently selected from the group consisting of methyl-group, ethyl-group and phenyl-group;
• wherein d+e is 1-1000, and R11, R12, R13, R14, R15, R16, R17 are same or different and independently selected from the group consisting of methyl-group, ethyl-group and phenyl-group;
• wherein f is 1-1000, and R18, R19, R20, R21, R22, R23, R24, R25, R26, R27, R28 are same or different and independently selected from the group consisting of methyl-group, ethyl-group and phenyl-group;
• wherein g+h is 1-1000, and R29, R30, R31, R32 are same or different and independently selected from the group consisting of methyl-group and phenyl-group;
• wherein R′ is selected from the group consisting of vinyl, methyl-group, ethyl-group, phenyl-group and mixtures thereof, R″ is selected from the group consisting of methyl-group, ethyl-group, phenyl-group, vinyl-group and mixtures thereof;
• wherein i+j is 1-1000, and R33, R34, R35, R36, R37, R38, R39, R40, R41 are same or different and independently selected from the group consisting of methyl-group and phenyl-group;
• and mixtures thereof.