WERKWIJZE TER BEREIDING VAN TOT ELASTOMEREN VERKNOOPBARE MASSA'S, ALSMEDE GEVORMD VOORTBRENGSEL, DAT GEHEEL OF TEN DELE DAARMEE IS VERVAARDIGD.

摘要

An improved process for preparing compositions capable of being converted into elastomers containing (A) triorganosiloxy-terminated diorganopolysiloxanes having at least one vinyl group in each terminal unit, (B) triorganosiloxy-terminated organopolysiloxanes containing organohydrogensiloxane units and diorganosiloxane units, (C) fillers which are hydrophobic or are capable of being rendered hydrophobic and having a surface area of at least 50 m2/g and (D) catalysts which promote the addition of SiH groups to vinyl groups which comprises mixing organopolysiloxanes (B) containing organohydrogensiloxane (SiH) units with at least 75 percent by weight of the fillers (C) having a surface area of at least 50 m2/g before mixing with the organopolysiloxanes (A) having triorganosiloxy-terminal units with at least one vinyl group in each terminal unit.