Abstract: The present invention concerns type II photoinitiators for the free-radical crosslinking of silicone compositions, in particular acrylic silicone compositions. The present invention concerns a silicone composition C1 that can be crosslinked by exposure to radiation with a wavelength of between 300 and 450 nm, comprising: —at least one organopolysiloxane A comprising at least one methacrylate group bonded to a silicon atom, at least one organohydrogenopolysiloxane H comprising at least two, and preferably at least three hydrogen atoms each bonded to different silicon atoms, and—at least one free-radical photoinitiator P. The present invention also concerns the provision of a silicone composition that can be polymerized or crosslinked by free-radical process comprising a type II photoinitiator system suitable for crosslinking silicone compositions, in particular by exposure to radiation, and absorbing light radiation with a wavelength greater than 300 nm.

Abstract: A system and method for forming a silicone composition C that is crosslinkable by exposure to radiation with a wavelength between 200 nm and 450 nm, having: at least one radical photoinitiator A; and at least one co-initiator B chosen from compounds having at least one hydrogen atom bonded to a silicon atom.

Abstract: Silicone compositions are described for the production of negative molds that include a silicone elastomer. The molds can be used in the production of molded articles.

Abstract: The present invention relates to a silicone composition C that is crosslinkable by exposure to radiation with a wavelength between 200 nm and 450 nm, comprising: at least one radical photoinitiator A; and at least one co-initiator B chosen from compounds comprising at least one hydrogen atom bonded to a silicon atom.

Abstract: The invention relates to a method for preparing polyorganosiloxanes functionalized by (meth)acrylate groups, preferably acrylate groups.

Abstract: There is provided a process for producing an organopolysiloxane A comprising at least one (meth)acrylate group, said process comprising the following steps: a) the following are reacted at a temperature of between 50 and 140° C., optionally between 70 and 130° C.: at least one organopolysiloxane B comprising at least one epoxy group, with acrylic acid or methacrylic acid or a mixture of the two, in the presence of a catalyst C which is a complex of iron in the oxidation state (III), of formula (1) below: [Fe(L1)3]??(1) in which the symbols L1, which may be identical or different, represent a ligand chosen from the group made up of: a ?-dicarbonylato anion or the enolate anion of a ?-dicarbonyl compound, a carboxylate anion and an alkoxide anion, and of at least one solvent, and b) the product obtained, which is said organopolysiloxane A or a mixture containing predominantly said organopolysiloxane A, is isolated.

Abstract: The present invention concerns a method for coating a textile material with a silicone elastomer composition crosslinkable by condensation reactions, to produce a solid silicone elastomer, optionally in a thin layer, on a flexible support that can be made from a textile material, paper, polyvinyl chloride, polyester, polypropylene, polyamide, polyethylene, polyurethane, non-woven glass fiber fabric or polyethylene terephthalate.

Abstract: An article having antifouling properties and intended to be employed in aquatic uses, in particular marine uses. In particular there is provided an article having antifouling properties and intended to be employed in aquatic uses which comprises: a) a support, b) optionally, at least one primer coat on said support comprising at least one anticorrosive product, c) optionally, at least one intermediate primer coat promoting adhesion between the coats, d) at least one adhesion-promoting coat or tie coat, deposited on said primer coat or on said support when the primer coat is absent, and e) at least one antifouling coat or topcoat, deposited on said adhesion-promoting coat or tie coat.

Abstract: An article having antifouling properties and intended to be employed in aquatic uses, in particular marine uses, which comprises: a) a support, b) optionally, at least one primer coat on said support comprising at least one anticorrosive product, c) optionally, at least one intermediate primer coat promoting adhesion between the coats, d) at least one adhesion-promoting coat or tie coat, deposited on said primer coat or on said support when the primer coat is absent, and e) at least one antifouling coat or topcoat, deposited on said adhesion-promoting coat or tie coat.

Abstract: A composition comprising: at least one organosilicon compound A comprising at least two identical or different hydrolyzable and condensable groups, or at least two silanol functions ?SiOH, at least one crosslinking agent B, optionally at least one filler C, and a catalytically effective amount of at least one polycondensation catalyst M which is a zinc complex comprising in its structure a first type of ligand that is a ?-diketonate and a second type of ligand that is an amine.

Abstract: The invention relates to a method for preparing carbene by means of deprotonation of a precursor salt using a strong base. A purpose of the invention is to enhance the synthesis of carbenes, i.e. to simplify same, to make said synthesis more economical and to obtain a liquid or solid, stable and pure form constituting a catalytic system that is easy to store and use and that has a higher efficiency, higher yield and higher selectivity than carbene catalysts of the prior art. In order to do so, the method comprises deprotonation in a solvent including an alcohol. The invention also relates to an alcohol-containing solution and carbene, and to a solid that can be obtained from the solution, e.g. by means of sublimation.

Abstract: The invention relates to an article with antifouling properties, intended for aquatic uses and, in particular, for marine uses, and to a method for slowing down the growth of aquatic organisms on submersible or semi-subermisible structures.

Abstract: The invention relates to an article with antifouling properties, intended for aquatic uses and, in particular, for marine uses, and to a method for slowing down the growth of aquatic organisms on submersible or semi-submersible structures.

Abstract: The present invention relates to an organopolysiloxane composition which is suitable for vulcanization into an elastomer as from room temperature, and which crosslinks via polycondensation, as well as to new organopolysiloxane polycondensation catalysts.

Abstract: The invention relates to the use of novel stable carbenes in solution as organopolysiloxane polycondensation catalysts.

Abstract: The invention relates to a silicone composition comprising components bearing ?SiH/?SiOH groups, which can be polymerized/cross-linked by means of a dehydrogenative condensation reaction in the presence of a carbene-type catalyst in solution.

Abstract: Processes are described for preparing polyurethane polymers by reacting an isocyanate with an alcohol using a non-tin based catalyst having the formula where R1, which are identical or different, are a fluoroalkyl, monovalent alkyl, cycloalkyl, (cycloalkyl)alkyl, or the ring of the cycloalkyl group that optionally comprises at least one heteroatom, R2 represents a hydrogen atom, an aromatic, arylalkyl, fluoroalkyl, alkylamine, alkylguanidine, monovalent alkyl, cycloalkyl or an alkyl group substituted by an optionally substituted ring, which optionally comprises at least one heteroatom, and R3 represents an arylalkyl, fluoroalkyl, alkylamine, alkylguanidine, monovalent alkyl, cylcoalkyl, or alkyl group substituted by an optionally substituted ring which optionally comprises at least one heteroatom, when the R2 radical is not a hydrogen atom, the R2 and R3 radicals optionally being linked to form a 3 to 7 membered optionally substituted aliphatic ring, and the R1, R2 and R3 radicals do not comprise a silico

Abstract: The invention relates to a silicone composition comprising components bearing ?SiH/?SiOH groups, which can be polymerised/cross-linked by means of a dehydrogenative condensation reaction in the presence of a carbene-type catalyst in solution.

Abstract: A compound having a guanidine structure and uses thereof as organopolysiloxane polycondensation catalysts are described.

Abstract: The present invention relates to an organopolysiloxane composition that can be vulcanized at room temperature into an elastomer that is crosslinked by polycondensation and that does not contain alkyltin-based catalysts and also to novel organopolysiloxane polycondensation catalysts.