Twin-screw extrusion of silicone doughs suited for SiH/SiVi RTV

Details Twin-screw extrusion of silicone doughs suited for SiH/SiVi RTV Twin-screw extrusion of silicone doughs suited for SiH/SiVi RTV

1994-05-04

1996-07-02

Miller, Edward A.

Compositions

Compositions containing a single chemical reactant or plural...

Organic reactant

524860, 26421123, C09K 300

Patent

active

055319238

ABSTRACT:
Silicone doughs suitable for incorporation into diorganopolysiloxane compositions crosslinkable into elastomeric state are rapidly and conveniently formulated by continuously and simultaneously individually introducing along the longitudinal axis of a twin-screw extruder, via a plurality of longitudinally spaced discrete inlet entries, and twin-screw extruding (a) a polydiorganosiloxane oil having a viscosity at 25.degree. C. of less than 500,000 mPa.s and containing at least two .tbd.Si-CH=CH.sub.2 functional groups per molecule, (b) water, (c) silica, and (d) a polysilazane which is liquid under normal conditions of temperature and pressure.

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