The Swatch Group Research and Development Ltd

Eta Sa Manufacture Horlogere Suisse

Maria Fernandez Ciurleo

Jean-Luc Helfer

Claire Rannoux

Stewes Bourban

Nicolas Francois

Juliette Muller

Lucie Brocher

Daniel Mallet

Frédéric Gonzales

An assembly of timepiece parts assembled together with an adhesive at a temperature Tand to be repositioned when the adhesive is at a temperature T. The adhesive includes a formulation, which at Tincludes 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 Tand to regenerate with the retro-Diels-Alder reaction at a temperature T, at Tforms 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&#x3c;T&#x2264;T, where temperature Tranges between 0&#xb0; C. and 100&#xb0; C. and temperature Tranges between 50&#xb0; C. and 200&#xb0; C., and Tis strictly lower than T. 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.

Assembly of timepiece parts assembled using repositionable hot melt adhesive and process for assembling and repositioning such parts

A watchmaking gasket, in particular a watch glass gasket for a timepiece, includes a polymer matrix charged with phosphorescent and/or fluorescent pigments.

Watchmaking gasket

The invention relates to a process for assembling and repositioning at least two parts by means of a repositionable hot melt adhesive, wherein said parts are held together in assembled position when said adhesive is at a temperature Tand can be repositioned in relation to one another when said adhesive is heated to a temperature T, wherein said adhesive comprises at least a formulation, which: The polymer chain is a block copolymer comprising at least a first polymer block having a glass transition temperature Tg or a melting temperature Tf ranging between 40&#xb0; C. and 200&#xb0; C., and at least a second polymer block comprising at least pendant diene units X and having a glass transition temperature Tg or a melting temperature Tf lower than T.

Process of assembling and repositioning two parts

A method of manufacturing an inlaid ceramic element for a timepiece including: a) forming a ceramic or cermet body; b) etching at least one recess in one face of the ceramic or cermet body, each at least one recess forming a pattern cavity for a decoration; c) changing a surface state of a bottom of the at least one recess to increase contact surface thereof; d) filling the at least one recess with a composite ceramic to form the decoration; e) flattening the composite ceramic so that the composite ceramic remains only in a hollow of the at least one recess.

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Fleurier, Switzerland

Maria Fernandez Ciurleo