Hydrophile silicone elastomer material used in particular...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 83/14 (2006.01) A61K 6/10 (2006.01) B41K 1/38 (2006.01) C08K 3/34 (2006.01) C08K 5/00 (2006.01) C08L 83/07 (2006.01) C08G 77/20 (2006.01) C08G 77/50 (2006.01)

Patent

CA 2368505

The invention concerns a silicone material crosslinkable into silicone elastomer by polyaddition reactions, useful in particular for impressions, for example dental. The invention aims at providing a material offering a compromise between the following characteristics: fluidity (in non crosslinked sate), hydrophily (in non crosslinked or crosslinked state) and high mechanical properties (in crosslinked state). The invention is characterised in that it consists in introducing into the crosslinkable silicone material: (i) a reinforcing siliceous filler in the form of a suspension obtained by subjecting the filler to a treatment in two stages by an agent providing compatibility (selected for example, concerning the first stage, among a silazane, a hydroxyl-containing siloxane, an amine, an organic acid; and concerning the second stage, among a silazane), by operating in the presence of a polyorganosiloxane with Si-alkenyl functions; and (2i) one or several non-ionic, ionic or amphoteric surfactants. Said silicone material is particularly useful for impressions, for example dental impressions and for making pads used in pad printing techniques.

L'invention concerne un matériau silicone réticulable en élastomère silicone par des réactions de polyaddition, utilisable notamment pour la prise d'empreintes, par exemple dentaires. Le but visé est de fournir un matériau offrant le compromis des caractéristiques suivantes: fluidité (à l'état non réticulé), hydrophilie (à l'état non réticulé ou réticulé) et hautes propriétés mécaniques (à l'état réticulé). L'invention repose sur l'introduction, dans le matériau silicone réticulable: (i) d'une charge siliceuse renforçante sous forme de la suspension obtenue en soumettant la charge à un traitement en deux temps par un agent de compatibilisation (choisi par exemple, s'agissant du 1er temps, parmi un silazane, un siloxane hydroxylé, une amine, un acide organique; et, s'agissant du second temps, parmi un silazane), en opérant en présence d'un polyorganosiloxane à fonctions Si-alcényles; et (2i) d'un ou plusieurs agents tensioactifs de nature non ionique, ionique ou amphotère. Les applications visées concernent l'utilisation du matériau silicone pour la prise d'empreintes, par exemple dentaires et pour la fabrication des tampons employés dans les techniques de tampographie.

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