A timepiece component including a phosphorescent multilayer structure (3) comprising a front layer (1) with a transparent or translucent polymer matrix and comprising phosphorescent pigments and a reflective underlying layer (2).

The present invention relates to a method for manufacturing an exterior part for a timepiece or piece of jewelry made of Murano glass, said method comprising the following steps: providing a material formed of glass rods (2), also referred to as glass tubes, arranged side by side; multi-cycle heat treatment to consolidate the material and form a blank; machining the blank to produce the exterior part, the method being characterised in that the heat treatment comprises a first cycle (a) consisting of heating the material from a temperature less than or equal to 100° C. to a temperature between 450 and 650° C. at a heating rate between 4 and 12° C./min in order to avoid the formation of air bubbles during the manufacturing of the blank. It also relates to the exterior part for a timepiece or piece of jewelry, in particular a watch case, having a structure with few or no air bubbles.

A method is for manufacturing an ornamental part, for example a watch, jewellery or telephone part, in particular a watch crown. The part includes, at least partially, a hard material with a Vickers hardness exceeding 1,000 HV. The method includes the following main steps: producing a precursor from a mixture of at least one powder material with a binder, producing an insert made of a polymer material, the insert having, at least partially, a negative shape of that desired for at least one portion of the part, overmoulding the precursor onto the insert made of a polymer material by injection into a mould to form a green body, and sintering the green body to form a body of the future part from the hard material.

An ornamental part, for example for a timepiece, jewellery or telephone, in particular a watch case middle, and its manufacturing method, the part at least partly including a hard material having a Vickers hardness greater than 1000 HV, the method including the following main steps: a step of producing a precursor from a mixture of at least one powder material with a binder, a step of injecting the precursor into a mould in order to form a green body, a step of sintering the green body in order to form a body of the future part from the hard material, and a step of depositing a polymer material coating on one face of the part, the deposition being carried out by moulding on the body, in particular by injection into a mould, the coating and the hard material being inseparable.

Disclosed are a thermally conductive composition that contains 10 to 50 parts by mass of a thermoplastic resin (A) and 50 to 90 parts by mass of a metal oxide (B) such as magnesium oxide (a total of the thermoplastic resin (A) and the metal oxide (B) being 100 parts by mass), and a thermally conductive composition that contains a thermoplastic resin (A) and a metal oxide (B) such as magnesium oxide, in which a modified polyolefin-based wax (C) is further contained in an amount of 0.1 to 20 parts by mass with respect to 100 parts by mass of the thermoplastic resin (A), such thermally conductive compositions being useful for applications such as a container, a piece of tableware, a heat dissipating member, a water-circulating structure material, an electronic device casing, a timepiece exterior material, a tumbler, and a commodity for daily use.

An item made of a material including by weight: a metallic and/or ceramic filler present in a percentage greater than or equal to 50% and less than or equal to 85%, at least one polymer present in a percentage greater than or equal to 15% and less than or equal to 50%, the polymer being bonded to the filler. The polymer can include a hydrogen bond donor which is a group NHx adjacent to a hydrogen bond acceptor which is a group C═O; so as to form a unit —[(C═O)NH]—; and the unit —[(C═O)NH]— representing at least 1% molar of the polymer.

Disclosed is a coating composition for watch elements, comprising a binder, preferably a two-component polyurethane; one or more pigments, preferably in quantities from 19 to 58% by weight of pigments (based on total solids of the composition); at least one filler; a solvent or a solvent combination, preferably butyl acetate and/or ethyl lactate. optionally one or more commonly used additives, customary auxiliaries or combinations of them. Further disclosed are a kit-of-parts, a coating on a watch element, a process for coating a watch element and a watch obtainable by said process or comprising said coating.

The invention relates to a bracelet lengthening device, comprising at least one adjusting assembly (1, 2) that is movable relative to a clasp cover (21), the adjusting assembly (1, 2) and the cover (21) being provided with a first and a second fastening element (23, 35′), respectively, for fastening them respectively in several positions that are able to bring about different bracelet lengths, characterized in that the adjusting assembly (1, 2) and the cover (21) are also provided with a first and a second indexing element (15, 35), respectively.

An exterior member that is favorably manufactured, a case having the exterior member and a timepiece having the case are provided. The exterior member includes an exterior main body section in which a first resin layer is provided on one side of a sheet member formed of carbon fiber and a cutout recess section from which a portion of the sheet member is exposed is provided in the first resin layer on the one side of the sheet member, and a protection member which covers the cutout recess section of the first resin layer. Accordingly, the exterior member is favorably manufactured with its strength being increased.

The manufacturing method comprises at least one processing step for a carbon-carbon composite part (100, 200). In a first variant, the method comprises steps for machining and a step for processing the part. In a second variant, the method comprises a crushing step for the part before the processing step and a moulding step after the processing step. Application to manufacturing timepiece components (170, 270).