Atofina

Elf Atochem S.a.

Other

Centre National De La Recherche Scientifique

Rhodia Chimie

Produits Dentaires Pierre Rolland

Vencorex Frence

Vencorex France

Yves Gnanou

Mathias Destarac

Daniel Taton

Frédéric Leising

Sophie Robin

Alex Dureault

Olivier Guerret

Gerard Mignani

Paul Tordo

Pascal Nicol

Thierry Senninger

Francis Dieras

Antoine Baceiredo

Tsuyoshi Kato

Jean-Pierre Bernard Finet

Muriel Plechot

Jean-Pierre Desvergne

Alexandrine Roubiere

Ramiro Guerrero-Santos

Vincent Gaud

Gopakumar Sivasankarapillai

Fran&ccedil;ois Lemoigne

Fabien Bonnette

The present invention relates to a process for preparing a compound comprising at least a urethane group &#x2014;HN&#x2014;C(&#x2550;O)&#x2014;O, said process comprising a step (E) in which a compound (I) comprising at least an isocyanate functional group &#x2014;N&#x2550;C&#x2550;O is reacted with an organic compound (II) carrying at least a hydroxyl group &#x2014;OH, said reaction being carried out in a presence of a carbene (III) used as a catalyst.

Synthesis of urethanes and polyurethanes catalysed by carbenes

A photosensitive adhesive composition of the polymerizable resin type, the hardening of which occurs by polymerization and/or reticulation, includes:&#x2014;initiators for at least one chain polymerization reaction to guarantee the hardening of the composition and a sufficient quantity of at least one bifunctional monomer, including a photolabile center with at least one photolabile entity and at least two polymerizable units, connected by covalent skeletons to the photolabile center and located away from the cleavage sites of the photolabile center, such that the composition loses the integrity and adhesivity thereof under the influence of a reticulating radiation causing the cleavage of the photolabile sites. The composition is particularly of application in dentistry.

Photosensitive adhesive composition

The invention concerns a method for preparing a first generation polymer comprising a step which consists in free radical polymerization of a composition comprising: at least an ethylenically unsaturated monomer, a source of free radicals, at least a dithiophosphoroester compound.

Method for synthesis of block polymers by controlled free radical polymerization

The invention concerns a method for preparing a first generation polymer comprising a step which consists in free radical polymerization of a composition comprising: at least an ethylenically unsaturated monomer, a source of free radicals, and at least a cyclic organic compound including at least a tetrathiophosphate group.

Synthesis of block polymers obtained by controlled free radical polymerization

Multimodal polymers by controlled radical polymerization in the presence of alkoxyamines

The invention relates to a process for the radical polymerization of at least one monomer in the presence of at least two stable free radicals of different natures. The use of two different stable free radicals is reflected by a higher productivity than that which would be expected on calculating the arithmetic mean of the productivities obtained with each of the stable free radicals when they are used individually.

Radical polymerization in the presence of several stable free radicals

The invention relates to a process for the polymerization or copolymerization of at least one monomer which is polymerizable by the radical route in the presence of a stable free radical from the nitroxide family. The stable free radical is &bgr;-substituted and provides excellent control of polydispersity while ensuring a better rate of polymerization or copolymerization, if they are compared with the stable free radicals used in the prior art.

Polymerization in the presence of a &bgr;-substituted nitroxide radical

A novel process for coupling living polymers containing terminal (meth)acrylic units, which enables an increase in molecular weight and/or a defined multi-sequencing and/or a star structure with a defined number of branches, is disclosed. The disclosed process comprises the steps of: (i) anionic polymerization using an initiator system consisting of a bi-functional initiator and a ligand to obtain a living polymer containing living terminal (meth)acrylics units; (ii) reacting it with an aldehyde compound of formula R--(CHO).sub.r in which r&gt;2; and (iii) recovering the final polycondensate by means known per se.

Process for manufacturing multisequence star or network polycondensates

A novel process for coupling living polymers containing terminal (meth)acrylic units, which enables an increase in molecular weight and/or a defined multisequencing and/or a star structure with a defined number of branches, is disclosed. The disclosed process comprises the steps of: (i) anionic polymerization using an initiator system consisting of a functional initiator and a ligand to obtain a living polymer containing living terminal (meth)acrylics units; (ii) reacting it with an aldehyde compound of formula R--(CHO).sub.r in which r.gtoreq.2; and (iii) recovering the final polycondensate by means known per se.

Growing community of inventors

Talence, France

Yves Gnanou