Process for preparing elastomers

Details Process for preparing elastomers Process for preparing elastomers

1975-06-23

1977-03-22

Jacobs, Lewis T.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 465UA, C08L 8304

Patent

active

040136116

ABSTRACT:
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 m.sup.2 /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 m.sup.2 /g before mixing with the organopolysiloxanes (A) having triorganosiloxy-terminal units with at least one vinyl group in each terminal unit.

REFERENCES:
patent: 3261802 (1966-07-01), Bobear
patent: 3699073 (1972-10-01), Wada et al.
patent: 3732330 (1973-05-01), Mink et al.
patent: 3892707 (1975-07-01), Itoh et al.

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