| abstract |
An assembly of timepiece parts assembled together with an adhesive at a temperature T A and to be repositioned when the adhesive is at a temperature T C . The adhesive includes a formulation, which at T C includes a mixture of polymer chains with pendant diene units X and coupling molecules including two dienophile end groups Y, wherein the X units and the Y groups are arranged to react with one another and to bond together with the Diels-Alder reaction at a temperature T DA and to regenerate with the retro-Diels-Alder reaction at a temperature T RDA , at T A forms a three-dimensional network, in which the polymer chains are linked to one another by the coupling molecules with the Diels-Alder reaction, where T A <T RDA ≦T C , where temperature T DA ranges between 0° C. and 100° C. and temperature T RDA ranges between 50° C. and 200° C., and T DA is strictly lower than T RDA . A process for assembling and repositioning two timepiece parts with a repositionable hot melt adhesive to enable the timepiece parts to be repositioned when the adhesive is heated. |