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US 5,205,973 AGranted
Precoagulation process for incorporating organic fibrous fillers
AssigneeE. I. Du Pont de Nemours and Company
InventorFred Y. Kafka
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Abstract
Incorporation of fibrous filler into a styrene-butadiene rubber (SBR) by mixing a fibrous filler, SBR latex and a coagulant, feeding the resulting coagulated fiber-filled SBR latex to a dewatering extruder and through a flow restriction that applies back pressure sufficient that water present in the SBR is forced out of a vent upstream from the flow restriction and discharging the fiber-filled SBR from the extruder.
Claims5
A process for incorporating fibrous filler into a styrene-butadiene rubber which comprises:
- a) mixing a styrene-butadiene rubber latex and about 1-400 parts by weight synthetic fibrous filler per 100 parts styrene-butadiene rubber,
- b) contacting the mixture with a coagulant for the styrene-butadiene rubber latex to form a coagulated fiberfilled rubber,
- c) feeding the coagulated fiber-filled styrene-butadiene rubber to a dewatering extruder and through a flow restriction in the extruder that applies back pressure sufficient that water present in the coagulated fiber-filled styrene-butadiene rubber is forced out of a vent provided in the extruder upstream from the flow restriction, and
- d) discharging the fiber-filled coagulated styrene-butadiene rubber from the extruder.
1 more element
Dependencies are inferred from the claim text.