Method for the continuous manufacturing of silicone rubber compo

Details Method for the continuous manufacturing of silicone rubber compo Method for the continuous manufacturing of silicone rubber compo

1998-10-19

2000-01-11

Moore, Margaret G.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524588, 26421123, 264349, 264211, 366 83, 366 91, 425204, 425205, 425208, C08J 320

Patent

active

060137010

ABSTRACT:
A method for continuous preparation of a high consistency or liquid silicone rubber base does not cause abrasive wear of the extruder screw and of the extruder cylinder or blackening of the silicone rubber base even when the latter is admixed with such fillers as an inorganic filler in the form of a diatomaceous earth powder, quartz or a similar large-grained and hard substance, or with a fumed silica, sedimentary silica, or a similar reinforcing silica filler. The method comprises continuously kneading the following components in a multiple-stage shear type single-screw extruder: (A) a freely-flowable powdered silicone rubber mixture having its main components in the form of (a) a cross-linkable polydiorganosiloxane with a viscosity exceeding 1.times.10.sup.5 mPa.multidot.s at 25.degree. C. and (b) an inorganic filler, and (B) a high consistency silicone rubber base having its main components in the form of (a) a cross-linkable polydiorganosiloxane with a viscosity exceeding 1.times.10.sup.5 mPa.multidot.s at 25.degree. C. and (c) a reinforcing silica filler, or a liquid silicone rubber base having its main components in the form of (d) a cross-linkable polydiorganosiloxane with a viscosity below 1.times.10.sup.5 mPa.multidot.s at 25.degree. C. and (c) a reinforcing silica filler.

REFERENCES:
patent: 4649005 (1987-03-01), Kobayashi et al.
patent: 5198171 (1993-03-01), Kasahara et al.
patent: 5409978 (1995-04-01), Hamada et al.
patent: 5908592 (1999-06-01), Kimura et al.

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