C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/4104, 400/53
C08L 83/04 (2006.01)
Patent
CA 1069241
ABSTRACT OF THE DISCLOSURE An improved process is provided for preparing compositions capable of being converted into elastomers. The compositions are ones containing (A) triorganosiloxy-terminated diorganopoly- siloxanes having at least one vinyl group in each terminal units, (B) triorganosiloxy-terminated organopolysiloxanes containing organonydrogensiloxane 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, and preferably also diorganopolysiloxanes (E) having on the average for each molecule, as terminal units, two diorgano- hydrogensiloxane units of the formula R2HSio1/2 or one diorganohydrogensiloxane unit of the formula R2HSi01/2 and one CH2=CR2SiO1/2 unit. The improved process comprises the essential steps of mixing organopolysiloxanes (B) containing organo- hydrogensiloxane (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 tri- organosiloxy-terminated units with at least one vinyl group in each terminal unit. The compositions are capable of being poured and/or brushed. The elastomers provided have improved tensile strength and tear resistance, are smooth and substantially free of gas bubbles, and have better mechanical properties than those of the prior art.
231221
Hechtl Wolfgang
Strasser Alois
Wohlfarth Ernst
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