Electrically conductive, potentially adhesive composition

Claim 1

An electrically conductive, potentially adhesive composition which comprises (a) a thermoplastic block copolymer having elastic properties and consisting of polysiloxane and urethane groups with a concatenation of recurring repeat units of formula I and formula II --O--(X--O--CO--NH--Y--NH--CO--O).sub.m X--O-- (I) --CO--NH--(Y--NH--CO--O).sub.a --Z--(O--CO--NH--Y).sub.a --NH--CO--(II) in which Z, having the formula III, denotes a divalent radical bearing a polysiloxane block --L--Si(R.sub.2)--O--Si(R).sub.2 ].sub.n --L'-- (III) wherein L and L', which are identical or different, denote divalent radicals of formula IV --T--CHR.sub.1 --CR.sub.2 R.sub.3 -- (IV) where T denotes a divalent radical forming part of the molecular structure of an unsaturated isocyanate or an unsaturated alcohol of the formulae OCN--T--CR.sub.1 ═CR.sub.2 R.sub.3 or HO--T--CR.sub.1 ═CR.sub.2 R.sub.3 these radicals T being hydrocarbon in nature and containing 1 to 20 carbon atoms, or said radicals including one or more hetero atoms or groups chosen from oxygen, sulfur, silicon and nitrogen atoms and ester or amide groups, R 1 , R 2 and R 3 independently denote a hydrogen atom or an alkyl or aryl group, or R 1 and R 2 together are alkylene, R, which are identical or different, denote alkyl radicals containing 1 to 5 carbon atoms or said alkyl radicals containing 1 to 7 chlorine or fluorine atoms or mixture thereof; cycloalkyl containing 3 to 8 carbon atoms or said cycloalkyl radicals containing 1 to 4 chlorine or fluorine atoms or mixture thereof; alkenyl radicals containing 2 to 5 carbon atoms; aryl or alkylaryl radicals containing 6 to 8 carbon atoms, or said aryl radicals containing 1 to 4 chlorine or fluorine atoms or mixture thereof; n is a number from to 1000, X and Y denote divalent radicals of hydrocarbon nature corresponding, respectively, to the diol X(OH) 2 and to the diisocyanate Y(NCO) 2 , each containing 2 to 20 carbon atoms, m denotes a number from 1 to 20, and z is zero or 1, and (b) an effective amount, sufficient to afford electrical conductivity to the composition, of particles with at least the surface of said particles being electrically conductive.