Organosilicone pastes and greases

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 3/26 (2006.01) C08K 9/04 (2006.01) C10M 107/50 (2006.01) C10M 169/02 (2006.01) C10M 169/04 (2006.01)

Patent

CA 2233244

Organosilicone pastes and greases including at least one oily diorganopolysiloxane polymer with a dynamic viscosity at 25 ·C of at least 500 mPa.s, and at least one alkali-metal or alkaline-earth metal carbonate, but no actual thixotropic agent, wherein said carbonate has a particle size of at most 0.5 µm and a high BET specific surface area of more than 5 m?2¿/g, and is present in an amount of at least 20 wt % based on the total composition. The preparation method is carried out at a low temperature, e.g. 5-40 ·C.

Les pâtes ou graisses organosiliciques comprennent au moins un polymère huileux diorganopolysiloxanique ayant une viscosité dynamique à 25 ~C au moins égale à 500 mPa.s et au moins un carbonate de métal alcalin ou alcalino- terreux, en l'absence d'agent thixotropant proprement dit, ce carbonate ayant une granulométrie inférieure ou égale à 0,5 µm et une surface spécifique BET élevée supérieure à 5 m2/g et étant présent à raison d'au moins 20 % en poids par rapport à la composition totale. Le procédé pour leur préparation est conduit à basse température, par exemple entre 5 et 40 ~C.

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