Adhesive characterized in that it comprises: 1) a compound of general formula wherein A is selected from the group consisting of CN, CO 2 Me and CO 2 Et, and D is a group defined by the general formula wherein R 1 is selected from the group consisting of H and Me, R 2 is selected from the group consisting of Si(Me 3) 3, and a C 1 -C 6 linear or branched alkyl chain, and n is comprised between 1 and 3, optionally combined with a compound of general formula wherein E is selected from the group consisting of CN, CO 2 Me and CO 2 Et, and G is a carboxylic ester moiety CO 2 R 3, wherein R 3 is selected from the group consisting of: C 1 -C 18 linear or branched alkyl chain, trimethylsilylated C 1 -C 3 alkyl chain, allyl, propargyl, cyclohexyl, cyclohexenyl, methylcyclohexyl, methylcyclohexenyl, ethylcyclohexyl, ethylcyclohexenyl, furfuryl, phenylethyl, phenoxyethyl, cyanoacrylate moiety, methacrylate moiety and acrylate moiety. 2) a thixotropic agent selected from the group consisting of hydrogenated castor oil, hydrogenated castor oil modified by reaction with an amine, and polyamides, 3) an accelerating agent, 4) a plasticizing agent selected from the group consisting of esters of C 2 -C 4 carboxylic acids with C 2 -C 5 alkyl alcohols having 2-4 hydroxyl groups, 5) a stabilizing agent, and the adhesive contains less than 0.01% by weight of silica. 1) a compound of general formula wherein A is selected from the group consisting of CN, CO 2 Me and CO 2 Et, and D is a group defined by the general formula wherein R 1 is selected from the group consisting of H and Me, R 2 is selected from the group consisting of Si(Me 3) 3, and a C 1 -C 6 linear or branched alkyl chain, and n is comprised between 1 and 3, optionally combined with a compound of general formula wherein E is selected from the group consisting of CN, CO 2 Me and CO 2 Et, and G is a carboxylic ester moiety CO 2 R 3, wherein R 3 is selected from the group consisting of: C 1 -C 18 linear or branched alkyl chain, trimethylsilylated C 1 -C 3 alkyl chain, allyl, propargyl, cyclohexyl, cyclohexenyl, methylcyclohexyl, methylcyclohexenyl, ethylcyclohexyl, ethylcyclohexenyl, furfuryl, phenylethyl, phenoxyethyl, cyanoacrylate moiety, methacrylate moiety and acrylate moiety. A is selected from the group consisting of CN, CO 2 Me and CO 2 Et, and D is a group defined by the general formula R 1 is selected from the group consisting of H and Me, R 2 is selected from the group consisting of Si(Me 3) 3, and a C 1 -C 6 linear or branched alkyl chain, and n is comprised between 1 and 3, E is selected from the group consisting of CN, CO 2 Me and CO 2 Et, and G is a carboxylic ester moiety CO 2 R 3, wherein R 3 is selected from the group consisting of: C 1 -C 18 linear or branched alkyl chain, trimethylsilylated C 1 -C 3 alkyl chain, allyl, propargyl, cyclohexyl, cyclohexenyl, methylcyclohexyl, methylcyclohexenyl, ethylcyclohexyl, ethylcyclohexenyl, furfuryl, phenylethyl, phenoxyethyl, cyanoacrylate moiety, methacrylate moiety and acrylate moiety. 2) a thixotropic agent selected from the group consisting of hydrogenated castor oil, hydrogenated castor oil modified by reaction with an amine, and polyamides, 3) an accelerating agent, 4) a plasticizing agent selected from the group consisting of esters of C 2 -C 4 carboxylic acids with C 2 -C 5 alkyl alcohols having 2-4 hydroxyl groups, 5) a stabilizing agent, and the adhesive contains less than 0.01% by weight of silica.