Potentially adhesive electrically conductive composition

Claim 2

Potentially adhesive electrically conductive composition characterized in that it comprises a thermoplastic polyblock organopolysiloxane copolymer having elastomeric properties and particles whose surface at least is electrically conductive.

Claim 3

Composition according to claim 1, characterized in that it also comprises a solvent or diluent.

Claim 4

Composition according to claim 2, characterized in that the solvent or diluent represents from 0 to 80 parts by weight, with from 100 to 20 parts by weight of copolymer.

Claim 5

Composition according to claim 2 or 3, characterized in that the solvent or diluent is chosen from the group consisting of: - aliphatic and alicyclic hydrocarbons, halogenated or otherwise, such as pentane, hexane, heptane, chloroform, dichloroethane, tetrachloroethane, trichloroethylene, perchloroethylene, methylene chloride, cyclohexane, methylcyclohexane and decalin, - aromatic hydrocarbons, halogenated or otherwise, such as toluene, xylene, tetralin, chlorobenzene and orthodichlorobenzene, and - aliphatic esters of monocarboxylic acids such as ethyl, butyl or amyl acetate.

Claim 6

Composition according to claim 4, characterized in that the solvent or diluent is chosen from the group consisting of: - chlorinated aliphatic hydrocarbons such as chloroform, dichloroethane, tetrachloroethane, trichloroethylene, perchloroethylene and methylene chloride, - aromatic hydrocarbons, halogenated or otherwise, such as toluene, xylene, tetralin, chlorbenzene and orthodichlorobenzene.

Claim 7

Composition according to claim 5, characterized in that the diluent or solvent is toluene.

Claim 8

Composition according to any one of claims 2 to 6, characterized in that the solvent or diluent represents from 30 to 80 parts by weight, with 70 to 20 parts by weight of copolymer.

Claim 9

Composition according to any one of the preceding claims, characterized in that the particles are particles of silver.

Claim 10

Composition according to claim 8, characterized in that the particles of silver have a mean size of between 0.1 and 50 microns and in that they represent from 60 to 85% by weight of the solids content of the composition.

Claim 11

Composition according to any one of the preceding claims, characterized in that the thermoplastic polyblock organopolysiloxane copolymer having elastomeric properties consists of a plurality of repeat units corresponding to the one and/or to the other of the two average formulae (I) and (II) below: in which the various symbols have the following meaning: - the symbols Y, which are identical or different denotes linear or branched alkylene radicals containing from 2 to 6 carbon atoms, and - the symbols R, which are identical or different, denote: alkyl and haloalkyl radicals containing from 1 to 4 carbon atoms, cycloalkyl radicals containing from 3to 8 carbon atoms, and aryl and haloaryl radicals containing from 6 to 8 carbon atoms, - the symbols X, which are identical, denote: linear or branched alkylene radicals containing from 1 to 8 carbon atoms, divalent radicals corresponding to the formula (III) in which: the symbols Q, which are identical, denote one of the groups -O- and -OCO- (-OCO being linked to T via the radical -CO-), the symbol T denotes a monocyclic divalent hydrocarbon radical containing from 6 to 8 carbon atoms or a divalent organic radical containing from 10 to 22 carbon atoms, consisting of 2 hydrocarbon rings fused to each other or linked by a valency bond or by one of the groups of formulae -0-, -CH 2 -, -C(CH 3 ) 2 - or -Si(R') 2 - (R' being an alkyl radical containing from 1 to 3 carbon atoms), and the symbols x, which are identical, denote 1, or 3, and divalent hydrocarbon radicals corresponding to the formula (IV): in which: the symbol T has the meaning given in formula (III) and - the symbols b, which are identical, denote 0, 1 or 2, - the symbols Z, which are identical, have the meaning given for X but cannot correspond to the formula (III), - the symbol a denotes 0 or 1, - the symbol p denotes any numberfrom 1 to 120 inclusive, and - the symbol n denotes any number from 1 to 1,000 inclusive.

Claim 12

Composition according to claim 10, characterized in that the thermoplastic polyblock organopolysiloxane copolymer having elastomeric properties consists of a plurality of repeat units corresponding to the one and/or to the other of the formulae (I) and (II) in which:

Claim 13

- Y denotes an ethylene radical, - R denotes a methyl, ethyl, n-propyl or phenyl radical, - X and Z denote: alkylene radicals chosen from ethylene and 1,4-butylene radicals, and radicals corresponding to the formula (III) given in claim 10, in which: - T denotes a radical chosen from the radicals of formulae: x and Q having the meaning given in claim 10, divalent hydrocarbon radicals corresponding to the formula (IV) given in claim 8, which are chosen from the group consisting of: - p denotes any number from 1 to 80 inclusive, and - n denotes any from 1 to 400 inclusive.

Claim 14

Composition according to claim 10 or 11, characterized in that the thermoplastic polyblock organopolysiloxane copolymer having elastomeric properties consists of a plurality of repeat units corresponding to the one and/or the other of formulae (I) and (II) which are given in claim 10 and in which: - R denotes a methyl radical, - X and Z have only the meanings given for Z, and -a= 1.

Claim 15

Composition according to claim 10 or 11, characterized in that the thermoplastic polyblock organopolysiloxane copolymer having elastomeric properties consists of a plurality of repeat units corresponding to the one and/or the other of the formulae (I) and (II) which are given in claim 10 and in which: - R denotes a methyl radical, - Z denotes a para-phenylene radical, and - x denotes a radical chosen from the radicals:

Claim 16

Compos tion according to any one of claims 10 to 13, characterized in that the copolymers contain, in their repeat units, from 10 to 800/o by weight of diorganopolysiloxane blocks -SiR 2 (OSiR 2 ) n -.

Claim 17

Article shaped from a composition according to any one of claims 1 to 14.

Claim 18

Flexible film, if appropriate self-supporting, produced from a composition according to any one of claims 1 to 14.

Claim 19

Film according to claim 16, characterized in that it comprises at least one surface produced from a composition according to any one of claims 1 to 14.

Claim 20

Film according to claim 17, characterized in that it comprises a first layer of a material chosen from polyimides, a second layer, if appropriate noncontinuous, arranged integrally onto the first surface, produced from a composition according to any one of claims 1 to 14.

Claim 21

Device comprising at least one face coated with a film produced from a composition according to any one of claims 1 to 14.

Claim 22

Device according to claim 19, characterized in that the face coated with the film is a surface produced from a material chosen from silicon, copper and alumina, which are coated, if appropriate, with gold or with silver.

Claim 23

Device according to claim 20, characterized in that the coated face is a surface made of silicon.

Claim 24

Device comprising at least three superposed layers, the middle sandwiched layer being a film produced from a composition according to any one of claims 1 to 14.

Claim 25

Device according to claim 22, characterized in that at least one of the layers in contact with the middle layer is made of silicon.

Claim 26

Device according to claim 21 or 22, characterized in that the middle layer is sandwiched between a layer of silicon and a layer of copper, alumina or polyimide, it being possible for the silicon, copper or alumina layers to be coated with gold or with silver.

Claim 27

Use of a composition according to any one of claims 1 to 14 in adhesive bonding (by thermocompression) known as die bonding.

Claim 28

Use of a film according to any one of claims 16 to 18 in mounting a component on a surface.

Claim 29

Use of a film according to any one of claims 16 to 18 adherent to the reverse side of a silicon wafer before it is sawn into a plurality of chips, to form chips which themselves also carry an adhesive film.