Pasty organopolysiloxane compounds for injection moulding

B - Operations – Transporting – 29 – C

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18/714

B29C 45/00 (2006.01) C08K 3/36 (2006.01) C08K 13/02 (2006.01)

Patent

CA 1184722

PRECIS DE LA DIVULGATION: Procédé de moulage par injection à basse pression de compositions organopolysiloxaniques. Ce procédé est caractérisé en ce que les compositions organopolysiloxaniques ont une viscosité comprise entre 4000 et 55 000 Pa.s à 25°C,et sont formées par mélange de 100 parties d'huiles diorganopoly- siloxaniques de viscosité 500 à 300 000 mPa.s à 25°C, 10 à 75 parties de silices renforçantes de surface spécifique d'au moins 50 m2/g, 1 à 20 parties d'agents antistructures et de 0,1 à 4 parties de peroxyde de dichloro-2,4 benzoyle, et en ce que l'on effectue le moulage entre 125°C et 225°C. Ce procédé permet d'obtenir une durée de cycle de moulage inférieure à 25 secondes.

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