France Telecom

Talc De Luzenac (societe Anonyme)

Nexans

Alain Rousseau

Bernard Boutevin

Yves Pietrasanta

Dominique Bosc

Franck Foll

Richard Baeza

Alain Pastouret

Jean-Yves Barraud

Frederic Clauss

Julienne Liang

Dominique Morichere

Clauss: Frederic

A method of continuous application of a graded index plastics optical fiber in which the refractive index is highest in the center and decreases progressively towards the periphery, said fiber having a plurality of layers of resin deposited concentrically, the method comprising making a plurality of mixtures, each mixture comprising at least one polymer P and a reactive diluting agent including at least two monomers, then depositing said mixtures in the form of coaxial layers, allowing interdiffusing to take place between the layers, and finally crosslinking the polymer P and/or the reactive diluting agent.

Graded index plastics optical fiber and a method of continuously fabricating a graded index plastics optical fiber

The invention relates to a crosslinkable material containing a polymer onto which chromophores are laterally grafted, characterized in that each chromophore is within a polymer unit which corresponds to the following formula (I): ##STR1## in which: X represents a part of the polymer chain,

Crosslinkable material which may be used in opto-electronics, process

The invention relates to a crosslinkable material that is active in non-linear optics, containing a polymer which carries chromophores each included in a polymer unit of formula: ##STR1## in which: T is part of the polymer chain,

Crosslinkable polymer material which may be used in non-linear optics

The invention relates to talc substances consisting of particles having a sheet structure. These substances are characterised in that each particle has internally the crystalline structure of talc which confers upon it certain specific properties of this mineral (softness, thermal stability) and has hydrophilic surface properties unlike the hydrophobic properties of mineral talc which give rise to useful reactivity. The substances according to the invention have a thermal and chemical stability range similar to that of talc. They can be manufactured by thermal or chemical means under conditions designed to avoid internal conversion of the talc and to effect the surface modifications consisting of replacing inert siloxane bridges by active hydrophilic groups.

Talc substances having specific surface properties and method of

Talc substances having specific surface properties, methods of

Growing community of inventors

Montpellier, France

Alain Rousseau